Vehicle body modal test system and vehicle body modal test method

Abstract

The invention relates to the technical field of automobile part testing, in particular to an automobile body modal testing system and an automobile body modal testing method. The state test system comprises a slide rail, a mobile vehicle, an excitation assembly, a laser vibration measurement assembly and a data analysis device; the moving trolley can move along the sliding rail; the excitation assembly is used for applying excitation to the whole vehicle to be tested; the laser vibration measurement assembly is arranged on the mobile vehicle, and the laser vibration measurement assembly is used for testing vibration acceleration information of a to-be-measured point of a to-be-measured vehicle; and the data analysis device is in signal connection with the laser vibration measurement assembly, and the data analysis device is used for receiving the vibration acceleration information and performing modal analysis. According to the application, the sliding rail and the moving vehicle are arranged to provide accurate movable ability for the laser vibration measurement assembly, manual operation is replaced, the influence of human factors on the test is reduced, and the test accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile accessory testing, and particularly relates to a vehicle body modal testing system and a vehicle body modal testing method. BACKGROUND

[0002] At present, the automobile industry is developing rapidly, and the comfort requirements for the whole vehicle and parts are gradually increasing. In the future, the performance of automobiles will further develop in the direction of comfort. The experience of consumers or passengers on the comfort of automobiles is mainly reflected in the level of NVH (Noise, Vibration, Harshness) performance, that is, consumers need a low-noise, low-vibration, and comfortable driving experience. In addition, it is also reflected in the durability of the whole vehicle and parts. In order to ensure driving comfort, the structure vibration modal of automobile parts needs to be tested during the production and manufacturing process to ensure that the parts have good performance. During driving, the modal of the vehicle circuit board is easily excited by other excitations, which may produce some abnormal current sound and damage the wiring harness connection, thereby causing functional failure. In order to ensure driving comfort and safety, it is necessary to test the modal of the vehicle circuit board and optimize its structure according to the modal results to improve its NVH and durability.

[0003] In the related art, the whole vehicle modal testing method is time-consuming and laborious. Engineers need to find ways to lift the tires of the whole vehicle, personnel need to climb under the vehicle to operate, and the acceleration sensor needs to be moved constantly to test the modal of the vehicle body under the whole vehicle state. The test process is not only time-consuming and laborious, but also the test accuracy is affected by personnel operation. SUMMARY

[0004] In the related art, the whole vehicle modal testing is time-consuming and laborious, and the test accuracy is affected by personnel operation and is difficult to ensure stability.

[0005] In a first aspect, an embodiment of the present application provides a vehicle body modal testing system, comprising: a slide rail, a mobile vehicle, an excitation assembly, a laser vibration measurement assembly, and a data analysis device; wherein, The mobile vehicle is movable along the slide rail. The excitation assembly is used to apply excitation to the whole vehicle to be tested. The laser vibration measurement assembly is arranged on the mobile vehicle, and is used to test the vibration acceleration information at the test point of the vehicle to be tested. The data analysis device is connected with the signal of the laser vibration measurement assembly, and is used to receive the vibration acceleration information and perform modal analysis.

[0006] In combination with the first aspect, in an implementation, the mobile vehicle is provided with a position adjusting assembly, which is configured to adjust the position of the laser vibration measurement assembly.

[0007] In combination with the first aspect, in an implementation, the position adjusting assembly comprises: a telescopic rod stand, a fixed end of which is installed on the mobile vehicle; a rotating part, a telescopic end of which is installed on the telescopic rod stand, and the rotating part is provided with the laser vibration measurement assembly, and the rotating part can drive the laser vibration measurement assembly to rotate circumferentially around the axis of the telescopic rod stand through rotation.

[0008] In combination with the first aspect, in an implementation, the rotating part is provided with a telescopic rod, and the telescopic rod is provided with the laser vibration measurement assembly.

[0009] In combination with the first aspect, in an implementation, the laser vibration measurement assembly comprises two laser vibration measurement units, and the two laser vibration measurement units are respectively installed on two ends of the telescopic rod.

[0010] In combination with the first aspect, in an implementation, the telescopic rod is provided with two position sensors, and each of the position sensors is configured to detect the position information of one of the laser vibration measurement units.

[0011] In combination with the first aspect, in an implementation, the mobile vehicle is provided with a controller, which is configured to control the mobile vehicle to move back and forth along the slide rail.

[0012] In combination with the first aspect, in an implementation, the mobile vehicle is provided with a photoelectric sensor at the bottom, which is configured to record the driving position of the mobile vehicle.

[0013] In combination with the first aspect, in an implementation, the mobile vehicle is provided with a buffer block.

[0014] The second aspect provides a vehicle body modal test method using the vehicle body modal test system according to any one of the above aspects, which comprises: applying excitation to the whole vehicle by using the excitation assembly; driving the mobile vehicle to move to a plurality of specified positions along the slide rail in sequence, and testing the vibration signal of the corresponding to-be-tested position of the to-be-tested vehicle by using the laser vibration measurement assembly after the mobile vehicle moves to each position; collecting the vibration signal by using the data analysis device and combining modal analysis. The technical scheme provided by the embodiments of the present application has the following beneficial effects: The application provides accurate movable capability for the laser vibration measurement assembly by setting the slide rail and the moving vehicle, replaces manual operation, reduces the influence of human factors on the test, and improves test accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 Part structure schematic diagram of the vehicle body modal test system in the embodiment of the present application. Figure 2 Schematic diagram of the vehicle body modal test system in the embodiment of the present application.

[0017] In the figure: 1, slide rail; 2, moving vehicle; 31, exciter; 32, power amplifier; 33, signal receiver; 34, data collector; 4, vehicle to be tested; 5, laser vibration measurement assembly; 51, laser vibration measurement unit; 61, telescopic rod stand; 611, fixed end; 612, telescopic end; 62, rotating part; 63, telescopic rod; 7, controller; 8, photoelectric sensor; 9, buffer block. DETAILED DESCRIPTION

[0018] In order to make the person in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0019] In the related art, the whole vehicle modal test is time-consuming and laborious, and the test accuracy is difficult to guarantee stability due to the influence of personnel operation.

[0020] In the first aspect, as shown in Figure 1 and Figure 2 The present application provides a vehicle body modal test system, which comprises: a slide rail 1, a moving vehicle 2, an excitation assembly, a laser vibration measurement assembly 5 and a data analysis device; wherein, The mobile vehicle 2 is movable along the slide rail 1; an excitation assembly is used to apply excitation to the whole vehicle 4 to be tested; a laser vibration measurement assembly 5 is arranged on the mobile vehicle 2, and the laser vibration measurement assembly 5 is used to test the vibration acceleration information at the test point of the vehicle 4 to be tested; and a data analysis device is connected with the signal of the laser vibration measurement assembly 5, and the data analysis device is used to receive the vibration acceleration information and perform modal analysis.

[0021] It is worth noting that the mobile vehicle 2 is used to move along the slide rail 1, and the position of the laser vibration measurement assembly 5 is adjusted, so that the vibration test of different positions of the vehicle 4 to be tested is realized. The slide rail and the mobile vehicle are arranged to provide the laser vibration measurement assembly with accurate movable capability, which replaces manual operation, reduces the influence of human factors on the test, and improves the test accuracy.

[0022] In some specific embodiments, the mobile vehicle 2 is provided with a position adjustment assembly, which is used to adjust the position of the laser vibration measurement assembly 5.

[0023] Further, the position adjustment assembly comprises a telescopic rod stand 61 and a rotating part 62; wherein, The telescopic rod stand 61 is fixedly connected with the mobile vehicle 2; the rotating part 62 is arranged on the telescopic end 612 of the telescopic rod stand 61, the laser vibration measurement assembly 5 is arranged on the rotating part 62, and the rotating part 62 can drive the laser vibration measurement assembly 5 to rotate around the axis of the telescopic rod stand 61.

[0024] It is worth noting that the telescopic rod stand 61 is used to adjust the height position of the laser vibration measurement assembly 5, and the rotating part 62 can realize 360° rotation, so as to adjust the position of the laser vibration measurement assembly 5 in the horizontal plane.

[0025] In some preferred embodiments, the rotating part 62 is provided with a telescopic rod 63, and the laser vibration measurement assembly 5 is arranged on the telescopic rod 63.

[0026] It can be understood that the telescopic rod 63 can further drive the laser vibration measurement assembly 5 to enter the test position of the vehicle 4 to be tested for measurement.

[0027] In some specific embodiments, the laser vibration measurement assembly 5 comprises two laser vibration measurement units 51, and the two laser vibration measurement units 51 are respectively arranged on the two ends of the telescopic rod 63.

[0028] It can be understood that the laser vibration measurement unit 51 is arranged on a bracket, and the position of the laser vibration measurement unit 51 is adjusted by a motorized cylinder, so that the left and right laser vibration measurement units 51 are arranged on the symmetrical positions of the vehicle body, and the symmetrical test and recording of the vibration of the floor of the vehicle body are realized.

[0029] Preferably, the telescopic rod 63 is provided with two position sensors, each of which is used to detect the position information of one of the laser vibration measurement units 51.

[0030] It is worth noting that the telescopic rod 63 is provided with two laser vibration measurement units 51, which can adjust the length of the rod to realize simultaneous testing of vibration signals at different positions and the distance between the two points. The laser vibration measurement unit 51 is driven to the to-be-measured point for detection, and the laser vibration measurement unit 51 can be repeatedly moved to the to-be-measured point to realize repeated positioning and detection of the to-be-measured point. The laser vibration measurement unit 51 is automatically driven to the to-be-measured point to realize automatic positioning, repeated positioning and automatic detection of the to-be-measured point, thereby improving the detection accuracy.

[0031] In some optional embodiments, the mobile vehicle 2 is provided with a controller 7, which is used to control the reciprocating movement of the mobile vehicle 2 along the slide rail 1. The bottom of the mobile vehicle 2 is provided with a photoelectric sensor 8, which is used to record the driving position of the mobile vehicle 2.

[0032] It is worth noting that the photoelectric sensor 8 is used to record the distance of the mobile trolley in space.

[0033] Further, the mobile vehicle 2 is provided with a buffer block 9.

[0034] It is worth noting that the buffer block 9 is installed on the front and rear of the mobile vehicle 2 to prevent the mobile vehicle 2 from being impacted in the front and rear directions.

[0035] In some optional embodiments, the excitation assembly includes a vibration exciter 31 and a power amplifier 32.

[0036] It can be understood that the vibration exciter 31 is used to excite the whole vehicle. The power amplifier 32 is used to feed back the excitation force signal to the data acquisition system.

[0037] Further, the data analysis device includes a signal receiver 33, a data collector 34, and a data analysis device.

[0038] It can be understood that the data collector 34 can adopt LMS data collection. The data analysis device uses the PloyMAX modal parameter identification method of the Modal-Analysis module in the LMS.Test.lab software to estimate the modal parameters of the comprehensive frequency response function, and ends the test after identifying the bending and torsional modes of the vehicle body.

[0039] In a second aspect, the application provides a vehicle body modal test method using the vehicle body modal test system of any one of the above aspects, which includes: Step S1, using the excitation assembly to excite the whole vehicle 2.

[0040] Step S2, drive the mobile vehicle 2 to move along the slide rail 1 to a plurality of test positions in turn, and after the mobile vehicle 2 moves to each position, test the vibration signal of the corresponding test position of the vehicle 4 to be tested by the laser vibration testing assembly 5.

[0041] Specifically, step S2 includes: Step S2a, while controlling the mobile vehicle 2 by the controller 7, control the cooperation of the telescopic rod stand 61, the rotating part 62 and the telescopic rod 63 to adjust the position and height of the laser vibration testing assembly 5.

[0042] Step S2b, test the body response point vibration and position by the laser vibration testing unit 51 and the position sensor.

[0043] Step S2b, control the mobile vehicle 2 to move to the next test position and adjust to the specified position and height.

[0044] Step S2c, the laser vibration testing unit 51 and the position sensor test the second group of vehicle body vibration and position.

[0045] Step S3, repeat step S2 multiple times to test multiple groups of vibration and position, and transmit the vibration signal to the acquisition system in real time through the signal transmitting device and the receiving device.

[0046] Step S4, use the data analysis device to collect the vibration signal and perform modal analysis.

[0047] Specifically, the infrared test obtains the displacement of the corresponding test point, and a geometric model is established by data acquisition software.

[0048] In summary, the present application provides precise mobile capability for the laser vibration testing assembly by setting the slide rail and the mobile vehicle, replaces manual operation, reduces the influence of human factors on the test, and improves the test accuracy. Through this device, the test manpower resources and test time can be greatly saved; at the same time, the data in the vehicle space (the moving position data before and after the two measurements) is more accurate.

[0049] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0051] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A vehicle body modal testing system, characterized in that, include: Slide rail (1); The mobile vehicle (2) can move along the slide rail (1); Excitation component, which is used to apply excitation to the entire vehicle under test (4); A laser vibration measurement component (5) is installed on the mobile vehicle (2). The laser vibration measurement component (5) is used to test the vibration acceleration information at the test point of the vehicle (4) under test. The data analysis device is connected to the laser vibration measurement component (5) by signal. The data analysis device is used to receive vibration acceleration information and perform modal analysis.

2. The vehicle body modal testing system as described in claim 1, characterized in that: The mobile vehicle (2) is equipped with a position adjustment component, which is used to adjust the position of the laser vibration measurement component (5).

3. The vehicle body modal testing system as described in claim 2, characterized in that, The position adjustment component includes: The telescopic pole column (61) has its fixed end (611) installed on the mobile vehicle (2); The rotating part (62) is installed at the telescopic end (612) of the telescopic pole column (61). The rotating part (62) is provided with the laser vibration measuring component (5), and the rotating part (62) can drive the laser vibration measuring component (5) to rotate circumferentially around the axis of the telescopic pole column (61) by rotation.

4. The vehicle body modal testing system as described in claim 3, characterized in that: The rotating part (62) is provided with a telescopic rod (63), and the telescopic rod (63) is provided with the laser vibration measuring component (5).

5. The vehicle body modal testing system as described in claim 4, characterized in that, The laser vibration measurement assembly (5) includes two laser vibration measurement units (51), which are respectively installed at both ends of the telescopic rod (63).

6. The vehicle body modal testing system as described in claim 5, characterized in that: The telescopic rod (63) is equipped with two position sensors, each of which is used to detect the position information of one of the laser vibration measurement units (51).

7. The vehicle body modal testing system as described in claim 1, characterized in that: The mobile vehicle (2) is equipped with a controller (7), which is used to control the mobile vehicle (2) to move back and forth along the slide rail (1).

8. The vehicle body modal testing system as described in claim 1, characterized in that: The bottom of the mobile vehicle (2) is equipped with a photoelectric sensor (8), which is used to record the driving position of the mobile vehicle (2).

9. The vehicle body modal testing system as described in claim 1, characterized in that: The mobile vehicle (2) is equipped with a buffer block (9).

10. A method for vehicle body modal testing using the vehicle body modal testing system as described in claim 1, characterized in that, include: The entire mobile vehicle (2) is stimulated using an excitation component; The mobile vehicle (2) is driven to move sequentially to multiple designated positions along the slide rail (1), and after each movement of the mobile vehicle (2) into position, the vibration signal of the corresponding test position of the vehicle under test (4) is tested by the laser vibration measurement component (5); Vibration signals are collected and modal analysis is performed using a data analysis device.

Images