WO2020228099A1 - Device for acquiring health diagnosis monitoring data of nuclear power engineering structure in self-excited manner - Google Patents

Abstract

A device for acquiring health diagnosis monitoring data of a nuclear power engineering structure in a self-excited manner, comprising a pneumatic air hammer, a high-precision force balance acceleration sensor, an analog-to-digital signal conditioner, an analog-to-digital signal converter, a data latch, a large-scale programmable logic controller, a main control CPU controller, an air hammer control circuit and a power supply conversion module; and the pneumatic air hammer is fixedly connected to said structure. The pneumatic air hammer is used as a self-excitation source to excite said structure. The use of the pneumatic air hammer can amplify a vibration signal of said structure, making the characteristics of said structure itself more obvious in the vibration signal, and by means of high-precision data acquisition and control, the precision of the test result is greatly improved. The self-excitation system can achieve various structural vibration test environments, greatly reducing the requirements for the precision of a test instrument device, and greatly reducing the structural test difficulty and the test cost.

Description

Self-excitation health diagnosis monitoring data acquisition device for nuclear power engineering structure Technical field

The invention relates to the field of structural health diagnosis and monitoring, in particular to a collection device for obtaining structural health diagnosis and monitoring data in a self-excitation manner.

Background technique

Nuclear power engineering structure (hereinafter referred to as structure, including building structure, bridge structure, etc.) health diagnosis refers to the use of some sensors, test elements, test instruments, etc., set at key parts of the structure, to monitor the various reactions of the structure in real time during operation. And transmit these data to the central control system, according to the pre-determined evaluation method and response threshold, real-time diagnosis of the health status of the structure, if necessary, propose corresponding treatment measures, and give it in extreme cases (such as typhoon, earthquake) Warning signs or countermeasures.

Structural health diagnosis is to obtain structural vibration data through electronic instruments, and perform technical analysis on the data through structural engineers or data calculation software to obtain structural characteristic data. At present, due to the particularity of the structure itself, in order to overcome the problems of too small vibration signal of the structure and excessive external interference noise, it is usually solved by improving the accuracy of the sensor and the accuracy of data collection. However, due to the existing electronic technology conditions, the sensor accuracy and data collection accuracy cannot be improved, and if you want to get real structural characteristic data, the cost will become higher and higher; because the vibration signal on some structures is too small and the noise is too large, it is useful The structural parameters of may have been submerged, so that useful structural characteristic data for the structure is not available, making the structural health diagnosis meaningless.

It is necessary to consider another method to artificially excite the structure under test, which can automatically obtain the structural characteristics in real time, provide guarantee for the safety of the structure and reduce the cost.

Summary of the invention

The purpose of the present invention is to design a nuclear power engineering structure self-excitation health diagnosis monitoring data acquisition device that can improve the data acquisition accuracy and reduce the cost.

In order to achieve the above objective, the technical solution of the present invention is as follows:

A self-excitation health diagnosis and monitoring data acquisition device for nuclear power engineering structure, including pneumatic air hammer, high-precision force balance acceleration sensor, analog-to-digital signal conditioner, analog-to-digital signal converter, data latch, and large-scale programmable logic controller , The main control CPU controller, the air hammer control circuit and the power conversion module; the pneumatic air hammer is fixedly connected to the structure;

There are three high-precision force balance acceleration sensors, namely the high-precision force balance acceleration sensor SN in the north-south direction, the high-precision force balance acceleration sensor EW in the east-west direction and the high-precision force balance acceleration sensor DU in the vertical direction. The high-precision force balance acceleration sensor SN, the high-precision force balance acceleration sensor EW, and the high-precision force balance direction acceleration sensor DU are respectively connected to the data latch via their respective analog-to-digital signal conditioners and analog-to-digital signal converters; the data The latch is bidirectionally connected with the main CPU controller;

The pneumatic air hammer is connected to the air hammer control circuit, and the air hammer control circuit is bidirectionally connected to the main control CPU controller; the pneumatic air hammer automatically knocks the structure through the air hammer control circuit, excites the structure to vibrate, and makes the structure The amplitude of the vibration signal increases, and the energy occupied by the fundamental frequency of the structure in the self-power spectrum increases;

The high-precision force balance acceleration sensor is an ultra-low frequency acceleration sensor, whose performance frequency response starts from 0 Hz, and its output terminal is connected with an analog-digital signal conditioner;

The analog-digital signal conditioner adjusts the full-scale ±5V vibration signal obtained by the high-precision force balance acceleration sensor into a signal that meets the requirements of the analog-digital signal converter;

The data latch is to latch the 16-bit digital data converted by the analog-to-digital signal converter, and wait for the main control CPU controller to read the data according to the program logic control;

The said analog-to-digital signal converter realizes the conversion from analog signal to digital signal through the logic control of peripheral standard configuration circuit and main control CPU controller;

The main control CPU controller realizes data collection of high-precision force balance acceleration sensor, data calculation management, data storage, data network communication and data interaction with remote monitoring software;

The power conversion module provides the power required by the entire device.

Further, the high-precision force balance acceleration sensor is FBA12 high-precision force balance accelerometer.

Further, the circuit of the entire device adopts a multilayer circuit board design.

Further, the entire device uses low-power general-purpose industrial-grade electronic components.

Further, the entire device uses virtual instrument electronic circuit design technology.

Further, the main CPU controller adopts an EM9170 industrial control motherboard.

Further, the pneumatic air hammer includes a strong magnetic magnet, a spring, a magnetic hammer head and a magnetic substrate; when not in operation, the magnetic hammer head is attached to the magnetic substrate; when in operation, when the three-way solenoid valve is energized, the pneumatic air hammer When the internal air inlet pressure is greater than the magnetic force, the magnetic hammer head separates from the magnetic base plate at high speed and impacts to the bottom, causing the structure to generate shock vibration; after the impact, the three-way solenoid valve is de-energized, the gas in the pneumatic air hammer is discharged, and the magnetic hammer head uses a spring Return to the initial position.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention uses a pneumatic air hammer as a self-excitation source to excite the structure. Through the use of pneumatic air hammers to excite the structure under test with external force, a suitable pneumatic air hammer is selected according to the characteristics of the structure to be tested. The use of pneumatic air hammers can increase the vibration signal of the structure, and the characteristics of the structure itself are reflected in the vibration signal It is more obvious that through high-precision data acquisition and control, the accuracy of test results is greatly improved. The self-excitation system of the present invention can realize various structural vibration test environments, greatly reduces the accuracy requirements for testing instruments and equipment, and greatly reduces the difficulty and cost of structural testing. The pneumatic air hammer of the present invention is a mature industrial product with national patents. Its characteristics are large impact force, low noise, simple structure, convenient use, controllable impact force and action time, convenient installation, and adjustable impact interval time. The test structure features a pneumatic air hammer with suitable impact force, and the control circuit is universal.

2. The main control CPU controller of the present invention is a cost-effective embedded motherboard oriented to the field of industrial automation. It uses FreeScale's iMX257 as its hardware core and is pre-installed with a genuine Window CE6.0 real-time multitasking operating system, which is constructed for users A universal embedded core platform that can be used directly. Use EM9170 industrial control motherboard as the main control controller, make full use of its abundant standard interface resources, powerful application development tools, low power consumption, low cost, suitable for use in harsh operating environments, continuous 24-hour work, and cost-sensitive advantages Of this system. The invention selects the EM9170 industrial control mainboard for pneumatic air hammer control, data calculation, data storage, and communication with the upper control center through the network interface RJ45. The selection of EM9170 industrial control motherboard takes into account the various environments in which the device works, which can meet the requirements of harsh field environments. At the same time, the EM9170 industrial control motherboard is low in cost, especially the calculation speed can meet the various functions of the device; the EM9170 industrial control motherboard itself has built-in operations The system also has a network RJ45 interface to realize direct networking, which can realize network monitoring of multiple devices; the selection of the EM9170 industrial control motherboard reduces the difficulty of peripheral circuit design, speeds up the time to put the device into use, and also reduces the cost of the device.

3. The present invention selects the mature RJ45 100M network interface to realize data communication with the upper control center. Each device acts as a network client, which can realize the communication between numerous clients and the upper control center. The present invention can realize the network monitoring of structural characteristic data through the monitoring center, carry out data interaction with multiple self-excitation data acquisition systems, and realize large-area large-scale structural characteristic data monitoring.

4. The high-precision force balance acceleration sensor of the present invention is a high-precision acceleration sensor selected in order to obtain complete and effective structural characteristic data. The sensor itself is a unidirectional ultra-low frequency broadband acceleration sensor that uses force balance electronic feedback and electromechanical The integrated design, which truly converts the unidirectional vibration acceleration into a voltage signal output, realizes various low-frequency and ultra-low frequency vibration measurement, with high precision, high sensitivity output, high dynamic range, good linearity, and low frequency starting from 0Hz ( The characteristics of the structural vibration signal require the use of an acceleration sensor with a 0-frequency start as a vibration pickup), a flat frequency response, a linear change in phase, good consistency in technical parameters, stable and reliable performance, low power consumption, small size, etc. .

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention.

Figure 2 is a schematic diagram of the acceleration sensor, analog-to-digital signal conditioner, and analog-to-digital signal converter circuit of the present invention.

Figure 3 is a schematic diagram of a data latch and a large-scale programmable logic device.

Figure 4 is a schematic diagram of the main control CPU controller core board circuit.

Figure 5 Schematic diagram of pneumatic air hammer and control circuit and power conversion module circuit.

Detailed ways

The present invention will be further described below in conjunction with the drawings. As shown in Figure 1, a nuclear power engineering structure self-excitation health diagnosis monitoring data acquisition device includes a pneumatic air hammer, a high-precision force balance acceleration sensor, an analog-to-digital signal conditioner, an analog-to-digital signal converter, a data latch and a large Scale programmable logic controller, main control CPU controller, pneumatic air hammer control circuit and power conversion module.

As shown in Figure 2, the high-precision force balance acceleration sensor is based on the characteristics of the structure test, with 3 measurement points set up, namely DU (vertical direction), EW (east-west direction), SN (north-south direction), high-precision force balance The sensor signal output is sent to pin 3 of the operational amplifier U1 of the analog-to-digital signal conditioner.

The analog-to-digital signal conditioner includes operational amplifiers U1 and U2; the signal output terminal of the high-precision force balance acceleration sensor is connected to the grounding protection tube D1 for limiting protection such as discharge voltage amplitude and surge impact. At the same time, the operational amplifier U1 has 2 pins It is connected to the 6-pin resistor R2 in series and the multi-turn high-precision potentiometer T1, pin 2 is connected to the ground resistor R1; the operational amplifier U1, resistor R2, potentiometer T1, and resistor R1 constitute a double in-phase amplifier, because the acceleration sensor is full The range output signal is ±5V, then the full-scale input signal of the analog-to-digital signal converter is ±10V, here the full-scale signal matching is achieved through the operational amplifier U1, and the precision multi-turn potentiometer T1 is used to adjust the amplification of the non-inverting amplifier circuit of the operational amplifier U1 Multiple to ensure the requirements of measurement accuracy;

The 4 pin of the operational amplifier U1 is the negative power supply, and the 7 pin is the positive power supply; the +12V power supply is connected to the 7 pin of the operational amplifier U1 through the resistor R3, and the filter capacitor C1 is connected to the ground. The resistor R3 and the filter capacitor C1 form an RC power filter network. Ensure that the power supply of the operational amplifier U1 is stable; the -12V power supply is connected to pin 4 of the operational amplifier U1 through the resistor R3 and the filter capacitor C1 is connected to the ground. The resistor R3 and the filter capacitor C1 form an RC power filter network to ensure the power supply of the operational amplifier U1 ；

The signal output of the operational amplifier U1 is connected to the 3 pin of the operational amplifier U2, and the 2 pin of the operational amplifier U2 is connected to the 6 pin. The operational amplifier U2 acts as a follower to improve the signal quality. Pin 1 and Pin 5 of the operational amplifier U2 are connected to the precision multi-turn potentiometer T2 to adjust the zero offset of the pre-signal processing circuit;

The processing method of the 4-pin and 7-pin power supply of the operational amplifier U2 is the same as that of the operational amplifier U1.

As shown in Figure 2, there are three analog-to-digital signal conditioners, corresponding to the three directions of high-precision force balance acceleration sensors; the three directions of high-precision force balance acceleration sensor signals are processed by the analog-to-digital signal conditioner. The output pin 6 of the amplifier U2 is connected to the Vin of the analog-to-digital signal converter U3 through a resistor R4. The analog-to-digital signal converter U3 is a successive approximation analog-to-digital signal converter. It is a 16-bit high-precision, high-speed, low-power analog-to-digital signal converter launched by American Analog Devices. It adopts successive approximation working principle, single + 5V power supply, single channel input, input voltage range +/-10V. Pin 1 and pin 4 of the analog-to-digital signal converter U3 are connected to resistor R5, pin 4 is connected to the ground capacitor C2; pin 3 is connected to the ground capacitor C2; pins 2, 5, 14, 25 and 23 are grounded respectively; 27 Pin and 28 are connected to the power supply VCC and the filter decoupling capacitor C1 to the ground respectively; Pin 26 is the data conversion status signal, and the output status pulse signal is connected to the data latch control pin of the data latch U4, and the three channels of data lock The memory control pins are CLK_SN, CLK_EW, CLK_DU; pin 24 is the working control signal of the analog-to-digital signal converter U3, and the three channels are collected synchronously. One control signal is used to work the U3 of the three-channel analog-to-digital signal converter The control signal AD_RC is connected together and implemented by a large-scale programmable logic controller. The device itself provides a self-excitation system to excite the structure and change the vibration condition of the structure itself. There is no need to use a higher-precision analog-to-digital signal converter, thereby reducing the cost and the difficulty of instrument development and design. The highest sampling frequency of the analog-to-digital signal converter U3 can reach 100KHz. According to the characteristics of structural vibration, low-frequency sampling is required. In this way, over-sampling technology can be used to achieve processing and improve signal quality.

As shown in Figure 3, the 16-bit data converted by the analog-to-digital signal converter U3 is sent to the data latch U4 for latching, and the main control CPU controller starts the analog-digital signal converter U3 once, and when the conversion of the analog-digital signal converter U3 ends After the conversion status signal changes, the conversion status signals CLK_SN, CLK_EW, CLK_DU are sent to the CLK pin of the data latch U4 for data latching, thus completing a data conversion. The latched data is sent to the main control CPU controller, and the main control CPU controller reads the data according to the decoding logic of the large-scale programmable logic controller. The 6 data latches U4 are divided into 3 groups, and each two pieces correspond to a piece of analog-to-digital signal converter U3 for 16-bit data latching, completing the data latch processing of the data converted by the three-channel analog-to-digital signal converter.

The large-scale programmable logic device U5 is a large-scale programmable logic device produced by lattice company. It mainly completes system logic processing. The logic programming uses ABL language and the programming software uses ispDesignEXPERT, which is simple and convenient. The pins 4, 7, 26, 29 of the large-scale programmable logic device U5 are respectively connected to the 3, 8, 6, 2 of J1, the 1 pin of J1 is connected to VCC, the 7 pin is grounded, and J1 is the logic device programming interface. The 22-pin, 23-pin, 24-pin, 36-pin, 37-pin, and 25-pin of the large-scale programmable logic device U5 are respectively connected to the CN2 terminal 9-pin, 10-pin, 12-pin, 17-pin, and 18-pin of the main control CPU controller U6 , 19 feet are connected; The 18 feet, 19 feet, 20 feet and 21 feet of the large-scale programmable logic device U5 are connected to the 13 feet, 14 feet, 15 feet and 16 feet of the CN2 terminal of the main control CPU controller U6; The large-scale programmable logic device U5 uses the six lines of ARM_WE, ARM_CS1, ARM_D0, ARM_SA0, ARM_SA1, and ARM_SA2 through the main control CPU controller U6 to realize the write operation through ABL language programming and decoding, and completes the AD_RC logic output control analog-to-digital signal converter start signal ; The large-scale programmable logic device U5 uses the five lines of ARM_RD, ARM_CS1, ARM_SA0, ARM_SA1, and ARM_SA2 through the main control CPU controller U6 to realize the read operation through ABL language programming and decoding, and completes the OC_SNH, OC_SNL, OC_EWH, OC_EWL, OC_DUH, OC_DUL logic Read and decode operation to realize data reading into the main CPU controller U6. The system design status indicator DD1 is used as the CPU status indicator; the large-scale programmable logic device U5 uses the eight lines of ARM_WE, ARM_CS1, ARM_D0, ARM_D1, ARM_D2, ARM_SA0, ARM_SA1, and ARM_SA2 through the main control CPU controller U6, and is realized by ABL language programming and decoding Write operation, realize the control of light-emitting diode.

As shown in Figure 4, the main CPU controller U6 includes a CPU chip and peripheral peripheral circuits.

The CPU chip controls the work of all logic function chips, and simultaneously manages structure data collection, data algorithm, data storage, and network communication. The circuit design of the main control CUP controller U6 needs to complete the system function and carry out the peripheral circuit design and matching. The master CPU controller U6 has a total of 72 pins. The pin 1 to pin 6 of the CN1 end of the master CPU controller U6 are network interfaces. The system is designed with an Ethernet interface to realize local network communication, and the instrument can achieve multi-functional requirements. Pin 1 Ethernet differential output signal TPTX+ is connected to pin 1 of network transformer U7, pin 1 of network transformer U7 corresponds to output pin 7 is connected to pin 1 of network interface RJ45 (J3); pin 2 Ethernet differential output signal TPTX- is connected to network Pin 3 of the transformer U7, pin 3 of the network transformer U7 corresponds to the output pin 14 and connects to the 2 pin of the network interface RJ45 (J3); pin 3 Ethernet differential input signal TPRX+ connects to the 6 pin of the network transformer U7, and the 6 pin of the network transformer U7 The corresponding output pin 11 is connected to the 3 pin of the network interface RJ45 (J3); the pin 4 Ethernet differential input signal TPRX- is connected to the 8 pin of the network transformer U7, and the 8 pin of the network transformer U7 corresponds to the output pin 9 to the network interface RJ45 (J3) Pin 6 of the CN1 end of the main control CPU controller U6 SP100M-connect to pin 10 of RJ45 (J3), pin 6 of the CN1 end of the main control CPU controller U6 LINK-connect to pin 12 of the RJ45 (J3); main control The 5-pin VDD_MCT on CN1 of the CUP controller U6 is the common terminal of the network transformer signal of the Ethernet port, which is connected to the 2 feet and 7 feet of the network transformer U7; the network interface RJ45 (J3) selects the connector with connection status and communication speed indication, RJ45 (J3) pins 4 and 5 are connected together, and pins 7 and 8 are connected together; the 9-pin SP100M+ of RJ45 (J3) is connected to the power output pin 3 of the power conversion module U9 through resistor R6, and the 11-pin of RJ45 (J3) LINK+ is connected to the power output pin 3 of the power conversion module U9 through the resistor R6. The power conversion module U9 completes the conversion of +5V power supply into +3.3V power supply for Ethernet status display. The input +5V power supply of the power conversion module U9 uses capacitors C1 and C2 for decoupling filtering, and the output +3.3V uses capacitors C1 and C2 for decoupling. Decoupling filtering ensures stable input and output voltages of the power conversion module U9.

The main control CPU controller U6 provides 2 USB ports: a high-speed main control interface and a USB OTG interface

mouth. The USB main control interface of the main control CPU controller U6 can be directly connected to a standard U disk, and it will automatically copy the system configuration file userinfo.txt in the U disk to the system, and set IP and other parameters according to userinfo.txt, and finally start the user s application. The USB main control port can also support standard keyboard, mouse and other equipment. The USB OTG interface of the main control CPU controller U6 can be used as a USB main control interface or as a USB device interface. As a typical application of the USB device interface, it is to support Microsoft's ActiveSync transmission protocol, which can be used to conveniently realize the management of the main CPU controller U6 file, and ActiveSync can also be used to debug applications. In addition, ActiveSync also maps the USB device port to a serial port, occupying the serial port logical number COM1, so the logical number corresponding to the real physical serial port of the master CPU controller U6 starts from COM2.

The 23 pins and 24 pins of the CN1 end of the main control CPU controller U6 are the differential port signals of the USB main control port, and the system reserves the designed USB interface. Pin 23 of the CN1 end of the main control CPU controller U6 is connected to pin 3 of the USB interface (J4), pin 24 of U6 is connected to pin 2 of the USB interface (J4); pin 4 of the USB interface is grounded through magnetic beads ZE L1; Pin 1 is connected to the magnetic bead ZE L2, the output is connected to the ground connection capacitors C1 and C2 for power decoupling filtering, and at the same time connected to the F1 fuse (0.5A), the power supply VCC is decoupling and filtering through the capacitors C1 and C2 and then connected to the F1 fuse , To ensure that the USB power output is guaranteed to be +5V, 0.5A; chip U8 is a transient voltage suppressor, USB interface chip, protects high-speed data lines ESD, EFT, lightning, pin 5 is connected to VCC, pin 2 is grounded, pin 6 is connected to USB Pin 2 of the interface (J4), pin 1 is connected to pin 3 of the USB interface (J4).

The 27 and 28 pins of the CN1 end of the main control CPU controller U6 are the differential signals of the USB_OTG port, the 11 pin is the USB_OTG access device type mark, and the 3 pin of the CN2 end is USB_OTG_VBUS, which is powered by the USB. Pin 27 of the CN1 end of the main control CPU controller U6 is connected to pin 3 of the USB_OTG interface (J5), pin 28 is connected to pin 2 of the USB_OTG interface (J5), and pin 11 is connected to pin 4 of the USB_OTG interface (J5) , USB_OTG interface (J5) is connected to the ground pin 5 of the magnetic bead ZE L3, and at the same time is connected to the USB_OTG interface (J5) pin 1, and the 3 pin USB_OTG_VBUS of the CN2 end of the main control CPU controller U6 is connected to the ground to the decoupling filter capacitor C1 And C2, at the same time series magnetic beads ZE L4 is connected to pin 1 of the USB_OTG interface (J5); U8 is a USB interface chip with the same function as U10, pin 5 is connected to the power supply VCC, pin 2 is grounded, and pin 1 is connected to the USB_OTG interface (J5) Pin 3 and Pin 6 are connected to Pin 2 of the USB_OTG interface (J5).

The CN2 terminal 25-pin CHUI_CON of the main control CPU controller U6 is connected to the base of the pneumatic air hammer control circuit transistor Q1.

On the 4-pin RSTIN# of CN2 end of the main control CPU controller U6, the external reset input is connected to the two-pin terminal J2, and the other end is connected to the ground resistance R25. When the main control CPU system has an operating error, it will reset. The 29-pin BATT3V and 3V battery input on the CN2 end of the main control CPU controller U6 ensures the long-term storage of the system setting data. The 29-pin is connected to the positive electrode of the battery BT1, and the decoupling filter capacitor C1 is connected to the ground. The 30-pin DBGSL# on CN2 end of the main control CPU controller U6, the debug mode selection input, is connected to the two-pin terminal J8, and the other end is connected to the ground resistance R1. The DBGSL# signal is used to select the working state of the system startup, and DBGSL# is set When it is low and the system is started, the main control CUP will enter the debugging state; when DBGSL# is set to high or floated and the system is started, the main control CUP will enter the running state. If the file userinfo.txt contains valid information at this time, the application will be start up.

As shown in Figure 5, it contains an air hammer control circuit and a power conversion module.

The air hammer control circuit includes a triode Q1, a resistor R1, and a solid state relay GJ1_L. The main control CPU controller U6 control signal CHUI_CON controls the solid state relay to control the power on and off of the pneumatic air hammer through the transistor Q1.

The main control CPU controller U6 sets the timing program to activate the air hammer control circuit to stimulate the measured structure according to the structural characteristics, start data collection, data storage, characteristic data calculation and analysis, and data communication.

The power conversion module provides +/-12V and +5V power required by the device. The input +12V power supply is connected to the DC/DC modules DS1 and DS2, the input +12V power supply is connected to the power inductor LL through decoupling filter capacitors C1 and C2, and the output end of the power inductor LL is again connected to DC through decoupling filter capacitors C1 and C2. /DC module DS1 and DS2 input terminal; DC/DC module DS2 is converted into +5V single power output, output power is output to each chip through decoupling filter capacitors C1 and C2; DC/DC module DS1 converts +12V power into +/-12V dual power supply output, the output +/-12V power supply directly powers the operational amplifiers U1 and U2, and two sets of C1 and C2 decoupling operations are required.

The acceleration sensor of the present invention selects the FBA12 high-precision force balance accelerometer based on the force balance principle for structural monitoring. According to the structure test experience, the structure monitoring acceleration sensor requires high precision, high dynamic range, ultra-low frequency and other characteristics. FBA12 high-precision force balance acceleration The meter is a single-direction broadband acceleration sensor. It adopts force balance electronic feedback and mechatronics design to truly convert the single-direction vibration acceleration into a voltage signal output, realizing various low-frequency and ultra-low frequency vibration measurements. FBA12 high-precision force balance accelerometer is a new generation of high-precision sensor, with high precision, high sensitivity output, high dynamic range, good linearity, low frequency starting from 0Hz, flat frequency response, linear phase change, consistent technical parameters The characteristics of good performance, stable and reliable performance, low power consumption, small size, etc. are very suitable for the present invention.

The main control CPU controller U6 of the present invention completes the functions of analog-to-digital signal converter logic control, data collection, structural characteristic data algorithm calculation, data storage, data recording file management, network data communication and other functions. Structural data storage and data recording file management should be realized by making full use of the powerful data calculation function of the main control CPU controller U6. The realization process of a complete structure data record is as follows: the structure characteristic data starts the pneumatic air hammer according to the structure test characteristics, and performs data collection, recording and data communication according to the preset data threshold. The device realizes network monitoring, and carries out the distribution and testing process according to the characteristics of structural testing.

All the components and connectors of the present invention can be purchased from the electronic market, as shown in Table 1, which is beneficial to greatly reduce the manufacturing cost and improve the performance of the data acquisition system.

Table 1: Devices with the same component label, the same package, the same

The present invention is an example of an overall scheme, and any equivalent concept or change within the technical scope disclosed in the present invention is included in the protection scope of the present invention.

Claims (7)

1. A self-excitation health diagnosis and monitoring data acquisition device for nuclear power engineering structure, which is characterized in that it includes a pneumatic air hammer, a high-precision force balance acceleration sensor, an analog-digital signal conditioner, an analog-digital signal converter, a data latch, and a large-scale Programming logic controller, main control CPU controller, air hammer control circuit and power conversion module; said pneumatic air hammer is fixedly connected to the structure;

   There are three high-precision force balance acceleration sensors, namely the high-precision force balance acceleration sensor SN in the north-south direction, the high-precision force balance acceleration sensor EW in the east-west direction and the high-precision force balance acceleration sensor DU in the vertical direction. The high-precision force balance acceleration sensor SN, the high-precision force balance acceleration sensor EW, and the high-precision force balance direction acceleration sensor DU are respectively connected to the data latch via their respective analog-to-digital signal conditioners and analog-to-digital signal converters; the data The latch is bidirectionally connected with the main CPU controller;

   The pneumatic air hammer is connected to the air hammer control circuit, and the air hammer control circuit is bidirectionally connected to the main control CPU controller; the pneumatic air hammer automatically knocks the structure through the air hammer control circuit, excites the structure to vibrate, and makes the structure The amplitude of the vibration signal increases, and the energy occupied by the fundamental frequency of the structure in the self-power spectrum increases;

   The high-precision force balance acceleration sensor is an ultra-low frequency acceleration sensor, whose performance frequency response starts from 0 Hz, and its output terminal is connected with an analog-digital signal conditioner;

   The analog-digital signal conditioner adjusts the full-scale ±5V vibration signal obtained by the high-precision force balance acceleration sensor into a signal that meets the requirements of the analog-digital signal converter;

   The data latch is to latch the 16-bit digital data converted by the analog-to-digital signal converter, and wait for the main control CPU controller to read the data according to the program logic control;

   The said analog-to-digital signal converter realizes the conversion from analog signal to digital signal through the logic control of peripheral standard configuration circuit and main control CPU controller;

   The main control CPU controller realizes data collection of high-precision force balance acceleration sensor, data calculation management, data storage, data network communication and data interaction with remote monitoring software;

   The power conversion module provides the power required by the entire device.
2. The self-excitation health diagnosis monitoring data acquisition device of nuclear power engineering structure according to claim 1, wherein the high-precision force balance acceleration sensor is an FBA12 high-precision force balance accelerometer.
3. The self-excitation health diagnosis and monitoring data acquisition device for nuclear power engineering structure according to claim 1, wherein the circuit of the whole device adopts a multilayer circuit board design.
4. The self-excitation health diagnosis and monitoring data acquisition device of nuclear power engineering structure according to claim 1, characterized in that: the whole device uses low-power general-purpose industrial-grade electronic components.
5. The self-excitation health diagnosis and monitoring data acquisition device for nuclear power engineering structure according to claim 1, wherein the whole device adopts virtual instrument electronic circuit design technology.
6. The self-excitation health diagnosis and monitoring data acquisition device for nuclear power engineering structure according to claim 1, wherein the main control CPU controller adopts an EM9170 industrial control motherboard.
7. The self-excitation health diagnosis monitoring data acquisition device for nuclear power engineering structure according to claim 1, characterized in that: the pneumatic air hammer comprises a strong magnetic magnet, a spring, a magnetic hammer head and a magnetic substrate; The hammer head is closely attached to the magnetic substrate; when the three-way solenoid valve is energized and the air inlet pressure in the pneumatic air hammer is greater than the magnetic force, the magnetic hammer head is separated from the magnetic substrate at a high speed and impacts to the bottom, causing the structure to generate impact and vibration; After the impact, the three-way solenoid valve is de-energized, the gas in the pneumatic air hammer is discharged, and the magnetic hammer head returns to the initial position by means of a spring.

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