CN115371928A - Airbag support system, modal testing system and method - Google Patents
Airbag support system, modal testing system and method Download PDFInfo
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- CN115371928A CN115371928A CN202211283391.3A CN202211283391A CN115371928A CN 115371928 A CN115371928 A CN 115371928A CN 202211283391 A CN202211283391 A CN 202211283391A CN 115371928 A CN115371928 A CN 115371928A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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Abstract
The disclosure provides an air bag support system, a mode testing system and a mode testing method, and relates to the technical field of automobiles. The system comprises: a first plate; the second plate is positioned above the first plate and connected with the first plate, and the second plate and the first plate are arranged at intervals and the distance between the second plate and the first plate is adjustable; the air bag is arranged on one side of the second plate far away from the first plate; and the supporting plate is arranged on one side of the air bag, which is far away from the second plate, and a clamping groove is arranged on the supporting plate and used for placing an object to be tested. The air bag support system is used for vehicle modal testing, so that the influence of additional mass such as a lifting appliance on the testing precision can be removed, the height of the air bag support can be freely adjusted, and the posture of an object to be tested can be matched.
Description
Technical Field
The disclosure relates to the technical field of automobiles, in particular to an airbag support system, a modal testing system and a modal testing method.
Background
With the development of the commercial vehicle industry, NVH (Noise, vibration, harshness) of the vehicle is more and more valued by manufacturers. The modal characteristics of the cab of the commercial vehicle have important influence on the dynamic characteristics and NVH performance of the whole vehicle. For example, the I-th order elastomer mode of a body-in-white is an important index for measuring the design level of the body-in-white, and the higher the mode frequency, the higher the rigidity of the body is, the more the body can resist the transmission of external vibration and the fatigue failure of the body, and the comfort of drivers and passengers and the reliability of the vehicle are improved. As the basis of dynamic characteristic analysis, the mode analysis can identify the vibration mode, the damping and the natural frequency of the body-in-white, and provides guidance for structural design and dynamic characteristic optimization of a cab.
In the correlation technique, the commercial vehicle body-in-white modal test adopts a hoisting mode to simulate a free boundary, and the additional mass of a hoisting tool influences the quality of a body-in-white system to be tested, so that the body-in-white modal test precision is influenced.
Disclosure of Invention
According to an aspect of the present disclosure, there is provided a balloon stent system comprising: a first plate; the second plate is positioned above the first plate and connected to the first plate, and the second plate and the first plate are arranged at intervals and the distance between the second plate and the first plate is adjustable; the air bag is arranged on one side of the second plate, which is far away from the first plate; and the supporting plate is arranged on one side of the air bag, which is far away from the second plate, and a clamping groove is arranged on the supporting plate and used for placing an object to be tested.
In some embodiments, at least one tie rod having one end fixed to the first plate, wherein the second plate is mounted to and movably disposed along the tie rod.
In some embodiments, the second plate is provided with a through hole, the pull rod passes through the through hole, the pull rod is provided with a threaded section, and a first nut and a second nut which are matched with the threaded section are arranged on two sides of the second plate respectively.
In some embodiments, at least one pull rod, both ends of which are fixed to the first plate and the second plate, respectively, wherein the pull rod is a telescopic rod.
In some embodiments, the at least one tie bar comprises four tie bars, and the four tie bars are distributed outside of the airbag.
In some embodiments, the air bag is removably mounted between the second plate and the support plate.
In some embodiments, the airbag is connected to the second plate by the airbag lower mounting plate and is connected to the support plate by the airbag upper mounting plate.
In some embodiments, the airbag lower mounting plate is bolted to the second plate; the air bag upper mounting plate is connected with the support plate through a bolt.
In some embodiments, the supporting plate is provided with a clamping groove for placing a metal plate of an object to be measured.
In some embodiments, the support plate is a nylon panel.
According to another aspect of the present disclosure, there is also provided a modal testing system, including: four air bag support systems as above, wherein, four air bag support systems are used for supporting the object to be measured.
In some embodiments, a vibration exciter for applying an excitation to an object under test; and the acceleration sensors are positioned on the object to be detected and used for outputting acceleration data when the vibration exciter applies excitation to the object to be detected.
According to another aspect of the present disclosure, a mode testing method based on the above mode testing system is further provided, including: constructing a geometric model of the object to be measured according to the measuring points of the acceleration sensors; fitting and calculating modal shape of the acceleration data acquired by the multiple acceleration sensors based on the geometric model; and evaluating the dynamic characteristics of the object to be measured according to the modal shape calculation result.
In some embodiments, the object under test is locally optimized based on the dynamic characteristics of the object under test.
In some embodiments, the modal shape calculation result and the simulation analysis result of the object to be measured are mutually verified.
In some embodiments, the object to be measured is a body-in-white, a vehicle frame, or a cab assembly.
In the embodiment of the disclosure, the airbag support system is used for vehicle modal testing, so that the influence of additional mass such as a lifting appliance on the testing precision can be removed, the height of the airbag support can be freely adjusted, and the posture of an object to be tested can be matched.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural view of some embodiments of the balloon stent system of the present disclosure;
FIG. 2 is a schematic flow chart diagram of some embodiments of a modal testing method of the present disclosure;
FIG. 3 is a schematic structural view of some embodiments of a body-in-white geometric model of the present disclosure;
FIG. 4 is a schematic flow chart diagram of further embodiments of a modal testing method of the present disclosure; and
fig. 5 is a body-in-white modal testing first order matrix diagram of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
To make the objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure will be described in further detail below with reference to specific embodiments and the accompanying drawings.
Fig. 1 is a schematic structural view of some embodiments of the airbag support system of the present disclosure, which includes a first plate 1, a second plate 2, an airbag 3, and a support plate 4, wherein the second plate 2 is located above the first plate 1 and connected to the first plate 1, and the second plate 2 is spaced apart from the first plate 1 and adjustable in distance; the air bag 3 is arranged on one side of the second plate 2 far away from the first plate 1; the supporting plate 4 is arranged on one side of the air bag 3 far away from the second plate 2 and used for placing an object to be measured. The object to be measured is, for example, a body-in-white, a frame or a cab assembly, the first plate 1 is a bottom plate, and the second plate 2 is an upper plate.
In some embodiments, the first plate 1 is provided with a through hole, i.e., a lightening hole, which is located, for example, at a central position of the first plate 1, thereby enabling to both lighten the weight of the airbag support system and maintain the stability of the airbag support system.
In some embodiments, a clamping groove is provided on the supporting plate 4 for placing a metal plate of an object to be measured, for example, a metal plate of a body in white, and the clamping groove is, for example, a V-shaped groove. The supporting plate is made of nylon backing plate or hard plastic. Because its hardness is lower, white automobile body panel beating falls in V type inslot, can not only avoid white automobile body panel beating wearing and tearing, can also increase area of contact, avoids white automobile body to drop the damage.
In the embodiment, the airbag support system is used for vehicle modal testing, so that the influence of additional mass such as a lifting appliance on the testing precision can be removed, the height of the airbag support can be freely adjusted, and the posture of an object to be tested can be matched.
In some embodiments of the present disclosure, the airbag support system further includes at least one pull rod 5, for example, four pull rods 5, and the four pull rods 5 are distributed outside the airbag 3, so that the airbag support system is more stable.
In some embodiments, one end of the tie rod 5 is fixed to the first plate 1; the second plate 2 is mounted to the tie rod 5 and is movably arranged along the tie rod 5. For example, the second plate 2 is provided with a through hole through which the tie rod 5 passes, and the tie rod 5 has a threaded section, and a first nut and a second nut engaged with the threaded section, and the first nut and the second nut are respectively located at both sides of the second plate 2. Namely, the four threaded long pull rods and the bottom panel are fixedly installed, for example, welded on the bottom panel, and movably assembled with the upper panel, so that the height of the air bag support system can be adjusted, and the air bag support system is installed through bolts and is convenient to disassemble.
In some embodiments, the two ends of the pull rod 5 are fixed to the first plate 1 and the second plate 2, respectively, wherein the pull rod 5 is a telescopic rod. The height of the air bag support system can be adjusted by adjusting the length of the pull rod 5.
In some embodiments of the present disclosure, the air bag 3 is detachably installed between the second plate 2 and the support plate 4, which facilitates timely replacement of the air bag 3 after damage.
In some embodiments, the airbag support system further comprises a lower airbag mounting plate 6 and an upper airbag mounting plate 7, wherein the airbag 3 is connected to the second plate 2 via the lower airbag mounting plate 6 and to the support plate 4 via the upper airbag mounting plate 7. For example, the bottom surface of the lower mounting plate of the air bag is connected with the upper panel, and the top surface of the lower mounting plate of the air bag is connected with the air bag; the bottom surface of the air bag upper mounting plate is connected with the air bag, and the top surface of the air bag upper mounting plate is connected with the support plate.
In some embodiments, the airbag lower mounting plate 6 is bolted to the second plate 2; the air bag upper mounting plate 7 is connected with the support plate 4 through bolts. The air bag is convenient to replace in time after being damaged, and the system is convenient to disassemble and transport.
The air bag support system is simple in design, convenient to detach and low in manufacturing cost, is used for modal testing, facilitates experimental arrangement, can remove the influence of a traditional lifting appliance on the additional mass of a body in white, and improves the accuracy and the testing precision of the free modal testing boundary.
In other embodiments of the present disclosure, a modal testing system is also protected, the modal testing system comprising four of the airbag support systems described above, wherein the four airbag support systems are used together to support an object to be tested. For example, four airbag support systems are respectively placed at four corners of a body-in-white, the height of the airbag support systems is adjusted according to the posture of the body-in-white, and the sheet metal part is clamped in a clamping groove of a supporting plate, so that modal testing can be performed subsequently.
In some embodiments, the modal testing system further comprises an exciter for applying an excitation to the object to be tested and a plurality of sensors. The vibration exciter is arranged on the other bracket panel, and the angle and the height of the vibration exciter are adjusted, so that the body-in-white waiting object is excited.
In some embodiments, the measuring points of the acceleration sensors are reasonably arranged according to the structure of the object to be measured, and when the vibration exciters apply excitation to the object to be measured, the acceleration sensors output acceleration data. For example, the excitation point of the vibration exciter is determined during the body-in-white modal test, and the body-in-white modal test is performed by a two-point vibration excitation and multi-point vibration pickup method, so that the acceleration sensor outputs an acceleration signal.
Fig. 2 is a flow diagram of some embodiments of a modal testing method of the present disclosure.
In step 210, a geometric model of the object to be measured is constructed according to the measuring points of the plurality of acceleration sensors.
In the step, as shown in fig. 3, model simplification is carried out on the body-in-white structure, and a body-in-white geometric model is constructed according to coordinates of measuring points through reasonably arranged measuring points of an acceleration sensor.
In step 220, based on the geometric model, fitting and modal shape calculation are performed on the acceleration data collected by the plurality of acceleration sensors.
In step 230, the dynamic characteristics of the object to be measured are evaluated according to the modal shape calculation result.
And carrying out local optimization on the object to be detected according to the dynamic characteristics of the object to be detected. For example, when the rigidity of a white body at a certain position is determined to be poor, the body is optimized in time.
In some embodiments, the modal shape calculation result and the simulation analysis result of the object to be measured are mutually verified. For example, through mutual verification of the test result and the simulation result, whether the simulation result is accurate or not can be judged, so that the simulation model is corrected, subsequent simulation optimization is facilitated, and the development period is shortened.
In the above embodiment, the airbag support system is used for placing the object to be measured, and the modal shape of the object to be measured is measured, so that the measurement result is more accurate, the dynamic characteristic of the object to be measured is identified, the test cost is saved, and the product development period is shortened. For example, in a vehicle sampling stage, the dynamic characteristics of a body-in-white are evaluated, the structure of the vehicle body can be optimized, and the NVH performance of the whole vehicle can be improved.
Fig. 4 is a schematic flow chart diagram of another embodiment of the modal testing method of the present disclosure.
At step 410, the body-in-white is placed and the exciter is secured.
Test instrument preparation and examination are first performed. Then, the air bag detecting support and the support supporting the vibration exciter are placed on the horizontal ground, four air bag detecting supports are uniformly arranged according to the size of the body-in-white to be detected, the height of each air bag support and the angle and the height of the vibration exciter are adjusted by using a screw rod, and a metal plate of the body-in-white is fixed in a V-shaped groove of a nylon panel of an air bag support system.
In step 420, acceleration sensor measuring points are reasonably arranged.
For example, a paper tape is attached to a white body test point and marking is performed on the paper tape according to rules. For example, the front wall, the rear wall, the left side wall, the right side wall, the floor and the top cover are respectively marked by English initials and Arabic numerals according to the custom. The distribution of the acceleration measuring points can reflect the geometric outline of the body in white and some key measuring points, for example, measuring points are arranged between nodes, and all measuring points simultaneously measure vibration acceleration vibration signals in X, Y and Z directions. For example, the coordinates are defined as: in the horizontal direction, the advancing direction of the automobile is taken as the X positive direction, the vertical direction is the Z positive direction, the horizontal direction is the Y direction, and the coordinates accord with the right-hand rule.
At step 430, a body-in-white geometric model is built.
According to marks arranged on the measuring points of the body-in-white modal test, selecting one measuring point as a coordinate origin, measuring the coordinate of each measuring point, marking the seat of each measuring point in an Excel table, and then importing modal test software to establish a geometric model of the body-in-white.
At step 440, the sensor is installed.
For example, a suitable sensor mounting is selected based on the frequency range of the test. For example, the sensor is attached by means of adhesive, magnetic base, double-sided tape, or the like. If the quality of the object to be tested is small and the requirement on the appearance after the test is not high, selecting an adhesion mode; if the object to be tested is made of iron and has large mass, the influence of the additional mass of the magnetic base on the testing precision is small, and when the appearance requirement is high after testing, the magnetic base mode is selected; and if the object to be tested has small mass and the appearance requirement is high after the test, selecting a double-sided adhesive tape mode.
When installing the sensor, it is necessary to ensure a sufficiently high installation frequency. From the perspective of modal testing, the higher the mounting rigidity is, the higher the mounting frequency is, and the higher the frequency band that can be used for measurement is.
In step 450, the exciter excitation point during the body-in-white mode test is determined.
Before the official test, at least three points are selected on the white vehicle body for excitation, and the response is measured at more than three points when each excitation point is excited, wherein the responses at the three selected excitation points must be measured. And comparing the frequency response function and the coherence curve obtained when each point is excited, and selecting the point which ensures that the frequency response function curve is smooth, the peak value is clear, the mode is not lost, and the coherence function above 0.8 is worth exciting at the excitation origin to be used as the excitation point in the formal test. In addition, the quality of the reciprocity of the frequency response functions between different excitation points and the coherence function of each response point can also be used as an auxiliary judgment basis for selecting the excitation points.
In addition, because the number of the test points in the white body modal is more, the influence of the additional mass of the acceleration sensor and the limit value of the number of channels of the data acquisition system are considered, two-point excitation and multi-point vibration pickup are adopted for testing, and the test is carried out in groups according to the position characteristics of the test points, for example, each group preferably comprises 8-10 test points, wherein the two-point excitation is carried out on the white body diagonal angles.
At step 460, a channel is set.
Selecting each used channel, wherein each channel needs to correspond to a sensor; the force sensor channel needs to be provided with a sensor type (force), a calibration value, a unit (mv/N), a direction, a name of an excitation point and the like; the acceleration sensor needs to set a sensor type (acquisition), a calibration value, a unit (mv/g), an actual measuring direction of a corresponding channel, a corresponding measuring point name during measurement and the like; this procedure is repeated for each measurement.
At step 470, pre-response.
In the range setting module, the bandwidth, the type and size of the excitation signal, the range of the sensor and the like can be set. The method is optimal in order to ensure that the measuring range of the force sensor is not exceeded and better acceleration signal response can be obtained so as to meet the optimal test condition.
At step 480, data is collected.
Time domain data and FRF (Frequency response function) data to be stored are selected, and the number of cycles of an appropriate bandwidth is set. For example, the body-in-white bandwidth of the commercial vehicle is set to 256Hz, and the cycle times are 20-30 times.
At step 490, the data is checked.
During the test, the Coherence value (Coherence) of each measuring point needs to be monitored in real time, and the Coherence meets the test requirements by adjusting parameters such as the magnitude of the exciting force, the measuring range of the sensor, the windowing type and the like.
At step 4100, the data is analyzed.
And performing time domain data analysis, data fitting and modal array type calculation according to the test result, and then performing modal validity and modal fitness check.
At step 4110, the result is verified.
And (4) performing benchmarking verification on the test result and the white body simulation analysis result.
In step 4120, body-in-white dynamics are evaluated.
And evaluating the dynamic characteristics of the body-in-white according to the modal test result, and providing local optimization measures according to the vibration mode.
For example, as shown in fig. 5, through the mode testing, four directional views of a body-in-white mode testing first-order mode diagram are obtained, and it can be seen that the weak point of the body-in-white structure is the a column, so that improvement direction can be provided for the dynamic performance optimization of the body-in-white.
In the embodiment, the whole modal test work can be independently and autonomously completed by the tester, the test method is simple, has low requirement on the test environment, is suitable for various indoor and outdoor test environments, and is safe and reliable. In addition, the air bag bracket system is adopted to place the body-in-white, the height is adjustable, the air bag bracket system is suitable for different types of structures, and the air bag bracket system can be used for large-scale structure modal testing for a long time; the free boundary condition of modal test is simulated, the test precision is high, the error of the test result and the simulation result is controlled to be about 3 percent according to the comparison and demonstration of the test result and the simulation calculation result, the modal frequency and the modal shape of the body-in-white can be accurately identified, and the support is provided for the NVH performance optimization of the body-in-white; in addition, the mode test is carried out through the vibration exciter, the excitation energy is large, the distribution is uniform, the data quality is high, the test cost can be saved, the product development period is shortened through the standardized mode test and analysis process, and the popularization is easy.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
The methods and apparatus of the present disclosure may be implemented in a number of ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (16)
1. A balloon stent system comprising:
a first plate;
the second plate is positioned above the first plate and connected to the first plate, and the second plate and the first plate are arranged at intervals and have adjustable space;
the air bag is arranged on one side, far away from the first plate, of the second plate; and
the backup pad, set up in the gasbag is kept away from one side of second board, just be provided with the draw-in groove in the backup pad for place the object that awaits measuring.
2. The balloon stent system according to claim 1, further comprising:
at least one pull rod, one end of which is fixed on the first plate, wherein,
the second plate is mounted to the pull rod and movably disposed along the pull rod.
3. The balloon stent system according to claim 2,
the second plate is provided with a through hole, the pull rod penetrates through the through hole and is provided with a threaded section, a first nut and a second nut, the first nut and the second nut are matched with the threaded section, and the first nut and the second nut are respectively located on two sides of the second plate.
4. The balloon stent system according to claim 1, further comprising:
and two ends of the pull rod are respectively fixed on the first plate and the second plate, wherein the pull rod is a telescopic rod.
5. The balloon stent system according to any one of claims 2 to 4,
the at least one pull rod comprises four pull rods, and the four pull rods are distributed on the outer side of the air bag.
6. The balloon stent system according to any one of claims 1 to 4,
the air bag is detachably mounted between the second plate and the support plate.
7. The balloon stent system according to claim 6, further comprising:
an air bag lower mounting plate and an air bag upper mounting plate, wherein,
the gasbag passes through mounting panel under the gasbag with the second board is connected, through mounting panel on the gasbag with the backup pad is connected.
8. The balloon stent system according to claim 7,
the air bag lower mounting plate is connected with the second plate through a bolt;
the air bag upper mounting plate is connected with the support plate through a bolt.
9. The balloon stent system according to any one of claims 1 to 4,
the supporting plate is provided with a clamping groove used for placing the metal plate of the object to be detected.
10. The balloon stent system according to any one of claims 1 to 4,
the supporting plate is a nylon panel.
11. A modal testing system, comprising:
four air bag support systems according to any one of claims 1 to 10, wherein four air bag support systems are used to support an object to be tested.
12. The modal testing system of claim 11, further comprising:
the vibration exciter is used for applying excitation to the object to be tested;
and the acceleration sensors are positioned on the object to be detected and used for outputting acceleration data when the vibration exciter applies excitation to the object to be detected.
13. A modal testing method based on the modal testing system of claim 12, comprising:
constructing a geometric model of the object to be measured according to the measuring points of the acceleration sensors;
fitting and calculating modal shape of the acceleration data acquired by the plurality of acceleration sensors based on the geometric model;
and evaluating the dynamic characteristics of the object to be detected according to the modal shape calculation result.
14. The modal testing method of claim 13, further comprising:
and carrying out local optimization on the object to be detected according to the dynamic characteristics of the object to be detected.
15. The modal testing method of claim 13, further comprising:
and mutually verifying the modal shape calculation result and the simulation analysis result of the object to be detected.
16. A modal testing method according to any of claims 13 to 15, wherein the object under test is a body in white, a vehicle frame or a cab assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211283391.3A CN115371928A (en) | 2022-10-20 | 2022-10-20 | Airbag support system, modal testing system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211283391.3A CN115371928A (en) | 2022-10-20 | 2022-10-20 | Airbag support system, modal testing system and method |
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| CN115371928A true CN115371928A (en) | 2022-11-22 |
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| CN117268676A (en) * | 2023-11-17 | 2023-12-22 | 西南交通大学 | Vibration test device and analysis method based on modal analysis |
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