KR102720209B1 - Load monitoring system using a plurality of wireless transmission devices in which low-power operation is implemented and operating method therefor - Google Patents

Abstract

An operating method for a load monitoring system using a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention comprises: a step of switching the plurality of wireless transmission devices to an activated state according to a predetermined cycle, wherein the plurality of wireless transmission devices are implemented to be electrically connected to a plurality of detection sensors provided at predetermined locations on a target structure; a step of generating strain information on a target structure based on voltage information measured from the plurality of detection sensors in a first predetermined section; a step of transmitting a plurality of wireless packets including the strain information to a gateway based on the plurality of wireless transmission devices in a second section after the first section expires; and a step of switching the plurality of wireless transmission devices from the activated state to a sleep state when the second section expires.

Description

{Load monitoring system using a plurality of wireless transmission devices in which low-power operation is implemented and operating method therefor}

The present specification relates to a load monitoring system using a plurality of wireless transmitters and an operating method therefor, and more particularly, to a load monitoring system using a plurality of wireless transmitters capable of low-power operation and an operating method therefor.

Typical structural health monitoring systems are usually based on wired measuring devices or single-hop wireless sensors. In these systems, the number of wireless sensors is limited and system scalability is reduced.

In particular, a continuous monitoring system for structures based on wires requires a lot of time and cost for initial system construction.

A strain gauge (or strain rate gauge) is a sensor that measures stress or strain in a material by utilizing the effect of "strain", that is, the deformation of an object caused by a torque applied to the object.

Specifically, strain gauges placed on major parts of a target structure, such as columns or ceilings, can sense vibrations or stresses of the target structure in real time and output sensing values as analog signals.

Meanwhile, the Wheatstone bridge is one of the electrical circuits widely used to measure minute resistance changes using a strain gauge attached to a structure or specimen whose deformation is to be measured, and is widely used in the field of testing static or dynamic strength of various engineering materials.

In particular, the Wheatstone bridge is essential for measuring the dynamic strains of the incoming and outgoing bars through which stress waves propagate in a split Hopkinson pressure bar system.

For a previous proposal, reference may be made to Patent Publication No. 10-2354139 regarding ‘Remote monitoring system for cladding deformation of piping structures using strain gauges.’

The purpose of this specification is to provide a load monitoring system using a plurality of wireless transmitters capable of low-power operation and an operating method therefor.

An operating method for a load monitoring system using a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention is characterized by including the steps of: switching the plurality of wireless transmission devices to an activated state according to a predetermined cycle, wherein the plurality of wireless transmission devices are implemented to be electrically connected to a plurality of detection sensors provided at predetermined locations on a target structure; generating strain information on the target structure based on voltage information measured from the plurality of detection sensors in a first predetermined section; transmitting a plurality of wireless packets including the strain information to a gateway based on the plurality of wireless transmission devices in a second section after the first section expires; and switching the plurality of wireless transmission devices from an activated state to a sleep state when the second section expires.

Meanwhile, a plurality of wireless packets according to the present embodiment are characterized in that they are transmitted based on a random access procedure performed between the plurality of wireless transmission devices.

Meanwhile, the step of generating strain information according to the present embodiment includes the step of generating corrected strain information by reflecting an error according to a temperature value measured from a temperature sensor provided in each of a plurality of wireless transmission devices with respect to the strain information.

Meanwhile, each of the plurality of wireless packets according to the present embodiment further includes at least one of information for identifying a corresponding wireless transmitting device, information indicating a remaining battery level of the corresponding wireless transmitting device, and information indicating a warning status according to strain information.

Meanwhile, each of the plurality of detection sensors according to the present embodiment is characterized by a single bridge structure including three resistors having the same resistance value as one strain gauge.

A load monitoring system using a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention comprises: a plurality of wireless transmission devices implemented to be electrically connected to a plurality of detection sensors provided at predetermined locations on a target structure, and implemented to generate strain information on the target structure based on voltage information measured from the plurality of detection sensors in a predetermined first section; and a gateway implemented to receive a plurality of wireless packets including strain information from the plurality of wireless transmission devices in a predetermined second section, wherein the plurality of wireless transmission devices are switched to an active state according to a predetermined cycle, and when the second section expires, the plurality of wireless transmission devices are switched from the active state to a sleep state.

According to the present embodiment, not only is it possible to secure improved safety by checking the absence stress of a target structure step by step to prevent risks, but a load monitoring system using a plurality of wireless transmission devices capable of low-power operation is also provided.

FIG. 1 is a drawing for explaining a load monitoring system using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention.
FIG. 2 shows an internal block diagram of a wireless transmitter capable of low-power operation according to an embodiment of the present invention.
FIG. 3 is a flowchart for explaining an operation method of a load monitoring system using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention.
FIG. 4 is a timing diagram for explaining the switching operation between the activation state and the sleep state of a plurality of wireless transmitter devices capable of low-power operation according to the present embodiment.
FIG. 5 is a diagram for explaining a method for transmitting a plurality of wireless packets by a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention.
FIG. 6 is a drawing showing an application example of a load monitoring system using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention.
Figure 7 shows an example of a load data map according to an embodiment of the present invention being implemented on a mobile device screen.

The above-described characteristics and the detailed description below are all exemplary matters to help explain and understand the present specification. That is, the present specification is not limited to these embodiments and may be embodied in other forms. The following embodiments are merely examples to completely disclose the present specification and are explanations to convey the present specification to those skilled in the art to which the present specification belongs. Therefore, when there are multiple methods for implementing the components of the present specification, it is necessary to make it clear that the present specification can be implemented by any of these methods, either a specific one or an identical one.

When it is stated in this specification that a certain configuration includes certain elements, or when it is stated that a certain process includes certain steps, it means that other elements or other steps may be included. In other words, the terms used in this specification are only for describing specific embodiments, and are not intended to limit the concepts of this specification. Furthermore, examples described to help understanding the invention also include complementary embodiments thereof.

The terms used in this specification have the meanings generally understood by those skilled in the art to which this specification belongs. Commonly used terms should be interpreted in a consistent meaning according to the context of this specification. In addition, the terms used in this specification should not be interpreted in an overly idealistic or formal meaning unless their meanings are clearly defined. Hereinafter, embodiments of this specification are described with reference to the attached drawings.

FIG. 1 is a drawing for explaining a load monitoring system using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention.

Referring to FIG. 1, a load monitoring system (100) using a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention may include a plurality of wireless transmission devices (110_1 to 110_N, where N is a natural number greater than or equal to 2), a gateway (120), and a monitoring server (130).

A plurality of wireless transmitters (110_1 to 110_N) of FIG. 1 can be implemented to be electrically connected to a plurality of detection sensors (S_1 to S_N) that are pre-equipped (or pre-attached) at each set location on the target structure.

For example, the target structure could be a laker or a system support.

For example, multiple detection sensors (S_1 to S_N) can be implemented with a conventional Wheatstone bridge structure including three resistors having the same resistance value as one strain gauge.

In this case, the resistance value of the strain gauge may change depending on the strain of the target structure being measured by multiple detection sensors (S_1 to S_N).

In other words, it will be understood that in a situation where multiple detection sensors (S_1 to S_N) are driven (i.e., power is supplied from multiple wireless transmitters), strain information can be generated based on a change in signal voltage according to a change in the resistance value of a strain gauge included in each of the multiple detection sensors (S_1 to S_N).

For example, the strain information may include three-axis tilt values measured from the target structure, and the process by which the strain information is generated is described in more detail with reference to the drawings described below.

Meanwhile, multiple wireless transmitters (110_1 to 110_N) can operate by switching between an active state and a sleep state according to a predetermined cycle.

For reference, the switching operation between the active state and the sleep state of multiple wireless transmitters (110_1 to 110_N) is described in more detail with reference to the drawings described later.

It will be understood here that the predetermined cycle may vary depending on the operating environment or may be set differently by the administrator.

For example, the active state may mean a state in which strain information can be generated based on voltage information (IN_S1 to IN_SN) measured from each of a plurality of detection sensors (S_1 to S_N) corresponding to a plurality of wireless transmitters (110_1 to 110_N), and the strain information can be wirelessly transmitted to the gateway (120).

For example, the sleep state may mean a state in which the remaining components are turned off except for essential components in a number of wireless transmitters (110_1 to 110_N) to save battery power and operate at low power.

That is, multiple wireless transmitters (110_1 to 110_N) in an activated state can generate strain information based on measured voltage information (IN_S1 to IN_SN) after power is applied to multiple detection sensors (S_1 to S_N).

Specifically, since the measured voltage information (IN_S1 to IN_SN) is an analog signal, it can be converted into a digital signal while passing through the inside of multiple wireless transmitters (110_1 to 110_N), and a correction function according to the ambient temperature and/or humidity can also be additionally reflected for the primarily converted digital signal.

In contrast, it will be understood that when multiple wireless transmitters (110_1 to 110_N) are in a sleeping state, not only is power not supplied to multiple detection sensors (S_1 to S_N), but strain information is also not generated.

For example, multiple wireless transmitters (110_1 to 110_N) in a sleeping state may turn on only the control module (e.g., 210 in FIG. 2) and turn off the remaining components.

Additionally, each of the plurality of wireless transmitters (110_1 to 110_N) in an activated state may be implemented to transmit a plurality of wireless packets including strain information to the gateway (120).

For example, in order to prevent a decrease in wireless communication efficiency due to packet collisions between multiple wireless transmission devices (110_1 to 110_N), multiple wireless packets according to the present embodiment may be transmitted based on a random access procedure.

Meanwhile, a wireless packet according to an embodiment of the present invention may be implemented to include at least one of first information for identifying a subject transmitting the wireless packet, second information indicating a remaining battery level of a wireless transmission device transmitting the wireless packet, third information indicating strain information for a target structure, fourth information indicating a warning state according to the strain information, and fifth information indicating a service code of the wireless packet.

For reference, warning states can be visualized by color into safe/caution/danger levels based on strain information.

The gateway (120) of Fig. 1 can perform a scan operation to receive multiple wireless packets from multiple wireless transmission devices (110_1 to 110_N). For example, the gateway (120) can perform primary filtering through a service code in the received wireless packet.

Next, the gateway (120) can parse information related to strain information, warning status, and battery level in the received wireless packet and transmit it to the monitoring server (130).

The monitoring server (130) of Fig. 1 can be linked with the gateway (120) based on wireless or wired communication.

For example, the monitoring server (130) can generate and visualize a load data map (e.g., FIG. 7) associated with a target structure based on information received from the gateway (120).

In this case, the monitoring server (130) can be understood as a mobile device or a web-accessible electronic device that performs visualization of a load data map (e.g., FIG. 7).

In this specification, the monitoring server (130) is illustrated as being linked with one gateway (120), but it will be understood that this specification is not limited thereto. That is, the monitoring server according to this specification may be linked with one or more gateways.

FIG. 2 shows an internal block diagram of a wireless transmitter capable of low-power operation according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, the wireless transmission device (210) of FIG. 2 may correspond to any one of the plurality of wireless transmission devices (110_1 to 110_N) of FIG. 1.

Additionally, the wireless transmitter (210) can receive voltage information (IN_S) measured from a detection sensor corresponding to the wireless transmitter (210) among a plurality of detection sensors (S_1 to S_N).

The wireless transmitter (210) of FIG. 2 may include an amplification module (211), a filter module (212), an ADC module (213), a correction module (214), a communication module (215), and a control module (216).

For example, the amplification module (211) can amplify and output voltage information (IN_S), which is a signal (strain signal such as vibration or stress) output from a plurality of detection sensors (S_1 to S_N).

For example, the filter module (212) can remove noise included in a signal output from the amplification module (211). As an example, the filter module (212) can be implemented as a low-pass filter to remove noise signal components.

For example, the ADC module (213) can generate output information (OUT_S) corresponding to a digital signal based on a signal from which noise component signals have been removed.

Here, the output information (OUT_S) may mean strain information generated based on any one of the voltage information (IN_S1 to IN_SN) measured from multiple detection sensors (S_1 to S_N).

For example, the correction module (214) can generate output information (OUT_S) that reflects an error according to a temperature value measured from a temperature sensor (not shown) provided in each of a plurality of wireless transmitters (110_1 to 110_N).

Meanwhile, the compensation module (214) may be implemented to refer to a database (not shown) in which strain information corresponding to raw data is pre-stored for each unit temperature value (e.g., 0.01°C) measured from a temperature sensor (not shown) in a situation where no separate load is applied.

In other words, when strain information due to an actual load at a specific temperature is received, the correction module (214) can be implemented to generate output information (OUT_S) as a value obtained by subtracting strain information corresponding to raw data at a specific temperature from the strain information due to an actual load.

For example, the communication module (215) may be implemented to transmit a wireless packet including strain information. Here, when the communication module (215) is implemented with a Bluetooth-based wireless communication protocol, the wireless packet may be understood as a Bluetooth advancing packet.

In this case, the wireless packet may include a separate service code to indicate that it contains strain information measured from multiple detection sensors (S_1 to S_N).

In this case, when a wireless packet is received at a gateway (e.g., 120), the gateway (e.g., 120) may be implemented so that a data part of the wireless packet having a corresponding service code indicating that it is related to the safety of a building can be decrypted preferentially.

Here, it will be understood that the data part of the wireless packet may include not only temperature information and humidity information, but also three-axis inclination values measured from corresponding detection sensors attached to the target structure.

For example, the control module (216) may be implemented to control the corresponding wireless transmitters (110_1, 110_2,…110_N) as a whole.

In particular, the control module (216) can control the wireless transmitter devices (110_1, 110_2,...110_N) to switch between an active state and a sleep state according to a predetermined cycle for low-power operation.

FIG. 3 is a flowchart for explaining an operation method of a load monitoring system using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention.

Referring to FIGS. 1 to 3, at step S310, a load monitoring system (e.g., 100 of FIG. 1) using a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention can switch the plurality of wireless transmission devices (e.g., 110_1 to 110_N of FIG. 1) from a sleep state to an active state according to a predetermined cycle.

For example, a plurality of wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) may be implemented to be electrically connected to a plurality of detection sensors (e.g., S_1 to S_N in FIG. 1) provided at predetermined locations on the target structure.

For example, the predetermined period may mean a time section corresponding to T1 to T1' of FIG. 4 described below. In addition, the first section corresponding to T1 to T2 (or T1' to T2') of FIG. 4 and the second section corresponding to T2 to T3 (or T2' to T3') of FIG. 4 may be implemented with a predetermined time length.

For reference, it will be understood that the predetermined cycle and the length of each section can be determined in advance or, if systematically required, the interval can be adjusted through beacon frames, etc.

In addition, a plurality of wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) in an activated state can generate strain information for a target structure based on voltage information (e.g., IN_S1 to IN_SN in FIG. 1) measured from a plurality of detection sensors (e.g., S_1 to S_N in FIG. 1) in a predetermined first section (e.g., T1 to T2 in FIG. 4).

At step S320, a load monitoring system (e.g., 100 of FIG. 1) using a plurality of wireless transmitters capable of low-power operation according to the present embodiment can correct strain information by reflecting environmental information.

For example, the environmental information may mean at least one of a temperature value measured from a temperature sensor (not shown) and a humidity value measured from a humidity sensor (not shown) provided in a plurality of wireless transmitting devices (e.g., 110_1 to 110_N in FIG. 1).

A load monitoring system (e.g., 100 of FIG. 1) using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention can generate corrected strain information by reflecting an error according to environmental information (i.e., a temperature value or a humidity value).

At step S330, a load monitoring system (e.g., 100 of FIG. 1) using a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention can transmit a plurality of wireless packets including strain information to a gateway (e.g., 120 of FIG. 1) based on the plurality of wireless transmission devices (e.g., 110_1 to 110_N of FIG. 1).

In step S340, a load monitoring system (e.g., 100 of FIG. 1) using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention can transmit a plurality of wireless packets including strain information to a gateway (e.g., 120 of FIG. 1) based on the plurality of wireless transmitters (e.g., 110_1 to 110_N of FIG. 1) in a second period (e.g., T2 to T3 of FIG. 4) after a first period (e.g., T1 to T2 of FIG. 4) has expired.

For example, in order to prevent a decrease in wireless communication efficiency due to packet collisions between multiple wireless transmission devices (110_1 to 110_N), multiple wireless packets according to the present embodiment may be transmitted based on a random access procedure.

At step S350, the load monitoring system (e.g., 100 of FIG. 1) using a plurality of wireless transmitters capable of low-power operation according to the present embodiment can switch the plurality of wireless transmitters (e.g., 110_1 to 110_N of FIG. 1) from the activated state to the sleeping state when the second period (e.g., T2 to T3 of FIG. 4) expires.

According to the present embodiment, it will be understood that low-power operation of a load monitoring system can be effectively implemented by minimizing unnecessary power consumption of a plurality of wireless transmitters that operate on batteries rather than constant power.

FIG. 4 is a timing diagram for explaining the switching operation between the activation state and the sleep state of a plurality of wireless transmitter devices capable of low-power operation according to the present embodiment.

Referring to FIGS. 1 to 4, the horizontal axis of FIG. 4 may represent time (t), and the vertical axis may represent the operating states of a plurality of wireless transmitting devices (e.g., 110_1 to 110_N of FIG. 1).

As described above, multiple wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) can be implemented to switch between a sleep state and an active state according to a predetermined cycle (T1 to T1').

For example, multiple wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) can be switched from a sleeping state to an active state at a first time point (T1).

Additionally, multiple wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) may be implemented to remain activated during the first period (T1 to T2) and the second period (T2 to T3).

For example, in the first section (T1 to T2), each of a plurality of wireless transmitting devices (e.g., 110_1 to 110_N in FIG. 1) can generate strain information for a target structure based on voltage information (e.g., IN_S1 to IN_SN in FIG. 1) measured from a plurality of detection sensors (e.g., S_1 to S_N in FIG. 1).

For example, in the second section (T2 to T3), each of a plurality of wireless transmitting devices (e.g., 110_1 to 110_N in FIG. 1) can transmit a plurality of wireless packets including strain information to a gateway (e.g., 120 in FIG. 1).

It will be appreciated that here, multiple wireless packets may be transmitted using a predetermined communication protocol (e.g., Bluetooth).

For example, in order to prevent a decrease in wireless communication efficiency due to packet collisions between multiple wireless transmission devices (110_1 to 110_N), multiple wireless packets according to the present embodiment may be transmitted based on a random access procedure.

Meanwhile, in the second section (T2 to T3), a gateway (e.g., 120 in FIG. 1) can parse multiple received wireless packets and transmit the acquired data to a monitoring server (e.g., 130 in FIG. 1) using a separate communication protocol (e.g., LTE).

For example, multiple wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) can be switched from an active state to a sleep state from a third time point (T3).

Next, multiple wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) can be implemented to maintain a sleeping state until the start time (T1') of the next cycle.

For reference, the random access procedure to prevent degradation of wireless communication efficiency is described in more detail with reference to Fig. 5 below.

FIG. 5 is a diagram for explaining a method for transmitting a plurality of wireless packets by a plurality of wireless transmission devices capable of low-power operation according to an embodiment of the present invention.

Referring to FIGS. 1 to 5, a plurality of wireless transmission devices (510_1 to 510_6) of FIG. 5 may correspond to a plurality of wireless transmission devices (e.g., 110_1 to 110_N of FIG. 1) of FIG. 1. In addition, a gateway (520) of FIG. 5 may correspond to a gateway (120) of FIG. 1. In addition, a second section (T2 to T3) of FIG. 5 may correspond to a second section (T2 to T3 or T2' to T3') of FIG. 4.

The vertical axis of the plurality of wireless transmitters (510_1 to 510_6) of FIG. 5 can be understood as a time axis (t1 to t6). In addition, the vertical axis of the gateway (520) of FIG. 5 can be understood as a time axis (t7).

According to the present embodiment, in order to prevent collision between wireless packets transmitted by multiple wireless transmission devices (510_1 to 510_6), the transmission timing of wireless packets for each of the multiple wireless transmission devices (510_1 to 510_6) can be defined in the second period (T2 to T3).

For example, multiple wireless transmitters (510_1 to 510_6) can obtain information about the starting point and the end point of the second section (T2 to T3) according to the initial settings.

Each of the plurality of wireless transmission devices (510_1 to 510_6) according to the present embodiment can individually set a backoff time (random backoff time, Tb[i]) corresponding to the backoff window to its own backoff counter.

Specifically, the backoff time (Tb[i]) is a pseudo-random integer value and can be calculated based on the following mathematical expression 1.

Here, Random(i) in mathematical expression 1 is a function that uses uniform distribution and generates a random integer between '0' and a preset upper limit value. In addition, the slot time (SlotTime) can be understood as a preset time interval.

For example, the six slot times (SlotTime) defined within the second section (T2 to T3) of Fig. 5 can be understood as corresponding to the first slot section (i.e., Tp_1 to Tp_2 of Fig. 5) to the sixth slot section (i.e., Tp_6 to Tp_7 of Fig. 5).

For example, assuming that the first wireless transmitter (510_1) generates Random(i) of Equation 1 as '1', the first wireless transmitter (510_1) can transmit the first wireless packet during the first slot period (i.e., Tp_1 to Tp_2 in FIG. 5) after its backoff counter (i.e., T2 to Tp_1) expires.

Here, the first wireless packet may include not only first identification information associated with the first wireless transmitter (510_1), but also strain information according to a change in absent stress occurring at the first installation location (P1) in the first slot section (i.e., Tp_1 to Tp_2 of FIG. 5).

For example, assuming that the second wireless transmitter (510_2) generates Random(i) of Equation 1 as '3', the second wireless transmitter (510_2) can transmit the second wireless packet during the third slot period (i.e., Tp_3 to Tp_4 in FIG. 5) after its backoff counter (i.e., T2 to Tp_3) expires.

Here, the second wireless packet may include not only second identification information associated with the second wireless transmitter (510_2), but also strain information according to a change in absent stress occurring at the second installation location (P2) in the third slot section (i.e., Tp_3 to Tp_4 in FIG. 5).

For example, assuming that the third wireless transmitter (510_3) generates Random(i) of Equation 1 as '2', the third wireless transmitter (510_3) can transmit the third wireless packet during the second slot period (i.e., Tp_2 to Tp_3 in FIG. 5) after its backoff counter (i.e., T2 to Tp_2) expires.

Here, the third wireless packet may include not only third identification information associated with the third wireless transmitter (510_3), but also strain information according to a change in absent stress occurring at the third installation location (P3) in the second slot section (i.e., Tp_2 to Tp_3 in FIG. 5).

For example, assuming that the fourth wireless transmitter (510_4) generates Random(i) of Equation 1 as '5', the fourth wireless transmitter (510_4) can transmit the fourth wireless packet during the fifth slot period (i.e., Tp_5 to Tp_6 in FIG. 5) after its backoff counter (i.e., T2 to Tp_5) expires.

Here, the fourth wireless packet may include not only fourth identification information associated with the fourth wireless transmitter (510_4), but also strain information according to a change in absent stress occurring at the fourth installation location (P4) in the fifth slot section (i.e., Tp_5 to Tp_6 of FIG. 5).

For example, assuming that the fifth wireless transmitter (510_5) generates Random(i) of Equation 1 as '4', the fifth wireless transmitter (510_5) can transmit the fifth wireless packet during the fourth slot period (i.e., Tp_4 to Tp_5 in FIG. 5) after its backoff counter (i.e., T2 to Tp_4) expires.

Here, the fifth wireless packet may include not only fifth identification information associated with the fifth wireless transmitter (510_5), but also strain information according to a change in absent stress occurring at the fifth installation location (P5) in the fourth slot section (i.e., Tp_4 to Tp_5 in FIG. 5).

For example, assuming that the sixth wireless transmitter (510_6) generates Random(i) of Equation 1 as '6', the sixth wireless transmitter (510_6) can transmit the sixth wireless packet during the sixth slot period (i.e., Tp_6 to Tp_7 in FIG. 5) after its backoff counter (i.e., T2 to Tp_6) expires.

Here, the sixth wireless packet may include not only sixth identification information associated with the sixth wireless transmitter (510_6), but also strain information according to a change in absent stress occurring at the sixth installation location (P6) in the sixth slot section (i.e., Tp_6 to Tp_7 in FIG. 5).

Meanwhile, in the second section (T2 to T3) of FIG. 5, the gateway (120) may be implemented to parse a number of received wireless packets and transmit the acquired data to the monitoring server (130).

Additionally, the monitoring server (130) may be implemented to continuously update and visualize the overall installation information of the target structure and the load data map for the target structure (e.g., FIG. 7) based on the data received from the gateway (120).

According to the present embodiment, it will be appreciated that improved monitoring performance can be provided because the loss of strain information on a target structure can be prevented because collisions between wireless packets transmitted from multiple wireless transmitters can be minimized.

FIG. 6 is a drawing showing an application example of a load monitoring system using a plurality of wireless transmitters capable of low-power operation according to an embodiment of the present invention.

Referring to FIGS. 1 to 6, for a clear and concise description of FIG. 6, it can be assumed that the target structure mentioned in this specification is a system support (10).

Referring to FIG. 6, the system support (10) may include a plurality of U-head jacks (U-Head Jack, 11), a vertical member (Handle, 13), a plurality of horizontal members (Post, 15), and a plurality of jack bases (Jack Base, 17).

For example, a U-head jack (11) may be an adjustable support installed on top of a system support (10) to fasten the yoke material to the system support. A vertical member (13) may be a main member that transfers the upper load of the formwork to the lower part.

Meanwhile, the horizontal member (15) may be a member that is connected horizontally to prevent buckling of the vertical member. The jack base (17) may be an adjustable support that is installed at the bottom of the system support (10) to maintain the horizontal and vertical positions of the vertical member.

For example, each of a plurality of wireless transmitters (e.g., 110_1 to 110_N in FIG. 1) can generate its own unique identification information and strain information corresponding to its installation location (P1 to P6).

More specifically, the first wireless transmission device (610_1) of FIG. 6 may be understood as any one of a plurality of wireless transmission devices (e.g., 110_1 to 110_N of FIG. 1).

For example, at the first installation location (P1), a first detection sensor (S1) implemented as a strain gauge may be attached to a vertical member (13) using a separate adhesive. In addition, a first wireless transmitter (610_1) electrically coupled to the first detection sensor (S1) may also be attached to the vertical member (13) using a separate adhesive.

In this case, it will be understood that the upper portion of the first detection sensor (S1) and the first wireless transmitter (610_1) may be waterproofed using a waterproof sheet.

Meanwhile, the first wireless transmitter (610_1) can be implemented to continuously monitor changes in member stress associated with the first installation location (P1) of the target structure (10) while performing the operations of FIGS. 1 to 5 described above.

Figure 7 shows an example of a load data map according to an embodiment of the present invention being implemented on a mobile device screen.

Referring to FIGS. 1 to 7, it will be understood that a load data map can be created through visualization of load information measured from multiple installation locations (P1 to P6) of a target structure (10).

According to this embodiment, it will be appreciated that the visualized load data map can be updated in real time through transmission and reception operations of wireless packets by a plurality of wireless transmitting devices (e.g., 110_1 to 110_N in FIG. 1).

Although the detailed description of this specification has described specific embodiments, various modifications are possible without departing from the scope of this specification. Therefore, the scope of this specification should not be limited to the above-described embodiments, but should be determined by the equivalents of the claims of this invention as well as the claims described below.

10: System Support
11: U-head
13: Vertical
15: Horizontal
17: Jack Bass
S_1~S_N: Multiple detection sensors
110_1~110_N: Multiple wireless transmitters
120: Gateway
130: Monitoring Server

Claims (6)

An operating method for a load monitoring system using multiple wireless transmitters capable of low power operation, comprising:
Switching the above multiple wireless transmitters to an active state during a first period and a second period according to a predetermined cycle,
The above plurality of wireless transmitters are implemented to be electrically connected to a plurality of detection sensors provided at predetermined locations in the target structure during the first section,
The above second interval corresponds to the time interval immediately following the expiration of the above first interval,
The first section and the second section are individually defined to have predetermined time lengths, and
The second section is a step implemented based on a plurality of predetermined slot times;
A step of generating strain information for the target structure based on voltage information measured from the plurality of detection sensors in the first section;
After the first period has expired, a plurality of wireless packets including the strain information are transmitted from the plurality of wireless transmission devices to the gateway during the second period.
A step in which each of the plurality of wireless packets is implemented to be transmitted at a specific slot time corresponding to a backoff time determined according to a random access procedure individually performed by the plurality of wireless transmission devices among the plurality of slot times; and
A method comprising the step of transitioning said plurality of wireless transmitting devices from said active state to said sleep state when said second period expires. In the first paragraph,
The above random access procedure is individually performed by the plurality of wireless transmitting devices according to a backoff time (T _b [i]) determined by the following mathematical formula:

Here, Random(i) is a function that uses a uniform distribution and generates a random integer between '0' and a preset upper bound, and
A method characterized in that the slot time (SlotTime) is a preset time interval. In the first paragraph,
The step of generating the above strain information is:
A method characterized by comprising a step of generating corrected strain information by reflecting an error according to a temperature value measured from a temperature sensor provided in each of the plurality of wireless transmitters with respect to the strain information. In the first paragraph,
A method characterized in that each of the plurality of wireless packets further includes at least one of information for identifying a corresponding wireless transmitting device, information indicating a remaining battery level of the corresponding wireless transmitting device, and information indicating a warning status according to the strain information. In the first paragraph,
A method characterized in that each of the above plurality of detection sensors has a single bridge structure including three resistors having the same resistance value as one strain gauge. A plurality of wireless transmission devices implemented to be electrically connected to a plurality of detection sensors provided at predetermined locations on a target structure during a predetermined first section, and implemented to generate strain information for the target structure based on voltage information measured from the plurality of detection sensors during the first section; and
Including a gateway implemented to receive a plurality of wireless packets including the strain information from the plurality of wireless transmitting devices in a second period corresponding to a time period immediately following the expiration of the first period,
The above plurality of wireless transmitting devices are switched to an active state during the first period and the second period according to a predetermined cycle,
The first section and the second section are individually defined to have predetermined time lengths,
The above second section is implemented based on a plurality of predetermined slot times, and
When the second period expires, the plurality of wireless transmitters transition from the active state to the sleep state.
A load monitoring system using multiple wireless transmitters capable of low power operation.

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