Body-in-white static stiffness test method and test platform

Abstract

The present application relates to the technical field of body-in-white static stiffness test, a body-in-white static stiffness testing method and a test platform, the method comprising: adjusting the positional relationship between each support according to the structural characteristics of the body-in-white, mounting the front suspension and the rear suspension of the body-in-white on the corresponding supports respectively, adjusting the supports so that all the supports are only subjected to the vertical downward force applied by the body-in-white, applying at least one preload to the body-in-white, applying a formal load to the body-in-white, the size of the formal load being gradually increased from low to high, collecting the data of the longitudinal beam of the body-in-white at each level, and calculating the static stiffness of the body-in-white. The test platform can adjust the position of the support according to the structural characteristics of the body-in-white, eliminate the internal stress of the body-in-white by applying a preload first, then gradually apply a formal load, obtain the numerical value of the body-in-white under multiple levels of load for calculation, and improve the accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of body-in-white static stiffness testing, and in particular to a body-in-white static stiffness testing method and a testing platform. Background Art

[0002] The static stiffness of the body-in-white (BIW) is one of the performance requirements that commercial vehicle BIW structures must meet. During commercial vehicle product development, static stiffness testing is essential to evaluate whether the developed BIW structure meets these requirements.

[0003] In practice, it is found that internal stress is generated when the body-in-white is assembled and when the body-in-white is installed with the test platform. This is why the values ​​obtained in subsequent torsion tests and bending tests always deviate from the actual values, resulting in reduced accuracy and reliability of the test results.

[0004] Therefore, a body-in-white static stiffness testing method and test platform are urgently needed to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a body-in-white static stiffness testing method and test platform, which can make the test results more accurate.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Body-in-white static stiffness test methods include:

[0008] S10. Adjust the positional relationship between the supporting members according to the structural characteristics of the body-in-white;

[0009] S20, installing the front and rear suspensions of the body-in-white on the corresponding support members respectively;

[0010] S30, adjusting the support members so that all the support members are subjected only to the vertical downward force exerted by the body-in-white;

[0011] S41, applying at least one preload F to the body-in-white 预 ;

[0012] S42, applying a formal load F to the body-in-white, and applying the formal load step by step from low to high, and collecting data of the longitudinal beams of the body-in-white step by step, to meet F 预 <F;

[0013] S43. Calculate the static stiffness of the body-in-white based on the above data.

[0014] As a preferred technical solution of the above-mentioned body-in-white static stiffness test method, the above-mentioned support member limits the freedom of movement of the rear suspension of the above-mentioned body-in-white in the front-rear direction.

[0015] As an optimal technical solution for the above-mentioned body-in-white static stiffness test method, the above-mentioned support member limits the freedom of movement of the front suspension of the above-mentioned body-in-white in the front-to-back direction, left-to-right direction, vertical direction, rotational direction around the above-mentioned front-to-back direction, and rotational direction around the above-mentioned vertical direction.

[0016] A test platform is also provided, which is suitable for the above-mentioned body-in-white static stiffness test method, and the above-mentioned test platform includes:

[0017] base;

[0018] A front support assembly, the front support assembly comprising a first bracket and at least two front support members arranged in the left-right direction, the first bracket being slidably arranged on the base in the front-back direction and being lockable with the base, the front support members being slidably connected to the first bracket in the left-right direction and being lockable with the first bracket, the front support members being used to mount the front overhang of the body-in-white;

[0019] The rear support assembly includes a second bracket and at least two rear support members arranged along the left and right directions. The second bracket is installed on the base. The rear support members are all slidably arranged on the second bracket along the left and right directions and can be locked with the second bracket. The rear support members are used to install the rear suspension of the white body.

[0020] As an optimal technical solution for the above-mentioned test platform, the above-mentioned first bracket includes a first adjustment mechanism and a first platform. The above-mentioned first adjustment mechanism connects the above-mentioned base and the above-mentioned first platform, and can adjust the height of the above-mentioned first platform in the vertical direction. The above-mentioned front support members are all slidably set on the above-mentioned first platform.

[0021] As a preferred technical solution for the above-mentioned test platform, the above-mentioned front support member includes a first sliding seat, a first telescopic rod and a first support tray. The above-mentioned first sliding seat can slide relative to the above-mentioned first platform. The above-mentioned first telescopic rod connects the above-mentioned first support tray and the above-mentioned first sliding seat and can adjust the height of the above-mentioned first support tray in the above-mentioned vertical direction.

[0022] As a preferred technical solution of the above-mentioned test platform, the above-mentioned front support member also includes a first connector, the above-mentioned first connector is detachably connected to the above-mentioned first support tray, and the front suspension of the above-mentioned body-in-white is connected to the above-mentioned first connector through a bearing.

[0023] As a preferred technical scheme of the test platform, the second support comprises a second adjusting mechanism and a second platform, one end of the second adjusting mechanism is connected with the base, the other end is hinged with the second platform, and the second adjusting mechanism can adjust the height of the second platform in the vertical direction and change the height difference of the two ends of the second platform in the left-right direction.

[0024] As a preferred technical scheme of the test platform, the second adjusting mechanism comprises a loading electric cylinder, the fixed part of the loading electric cylinder is installed on the base, and the telescopic part of the loading electric cylinder is hinged with the second platform.

[0025] As a preferred technical scheme of the test platform, the second adjusting mechanism further comprises a force sensor, and the force sensor is used to obtain the force condition of the loading electric cylinder.

[0026] As a preferred technical scheme of the test platform, the second support further comprises a first support column, one end of the first support column is connected with the base, the other end is hinged with the second platform, the first support column can be telescopic or locked in the vertical direction, and the second adjusting mechanism is located on one side of the first support column in the left-right direction.

[0027] As a preferred technical scheme of the test platform, the rear support part comprises a second sliding seat, a second support tray and a second connector, the second sliding seat is slidingly connected with the second platform, the second support tray is fixed opposite to the second sliding seat, the second connector is detachably arranged on the second support tray, and the rear suspension of the body-in-white is ball-hinged with the second connector.

[0028] The present application has the following advantages:

[0029] The present application provides a body-in-white static stiffness test method and test platform, which comprises the following steps: S10, adjusting the positional relationship between each support part according to the structural characteristics of the body-in-white; S20, mounting the front suspension and rear suspension of the body-in-white on the corresponding support parts; S30, adjusting the support parts so that all the support parts are only subjected to the vertical downward force applied by the body-in-white; S41, applying at least one pre-load F 预 to the body-in-white; S42, applying a formal load F to the body-in-white, and gradually applying the formal load from low to high, and gradually collecting the data of the longitudinal beam of the body-in-white, satisfying F 预 <F; S43, calculating the static stiffness of the body-in-white according to the data. In this way, before the formal test, the internal stress of the body-in-white is eliminated by applying the pre-load, the formal load is gradually applied, the data of the body-in-white is gradually collected, and then the calculation is performed, so that the test result is more accurate.

[0030] The test platform is suitable for the test method described above, can adjust each support position according to the structural characteristics of the body-in-white, and can assist in completing the bending test and the torsion test of the body-in-white. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application 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 according to the contents of the embodiments of the present application and the drawings without any creative labor.

[0032] Figure 1 is a flowchart of the body-in-white static stiffness test method provided by the embodiments of the present application;

[0033] Figure 2 is a structural schematic diagram of the test platform provided by the embodiments of the present application;

[0034] Figure 3 is a structural schematic diagram of the first support provided by the embodiments of the present application;

[0035] Figure 4 is a structural schematic diagram of the first platform provided by the embodiments of the present application;

[0036] Figure 5 is an assembly schematic diagram of the front support and the first platform provided by the embodiments of the present application;

[0037] Figure 6 is a structural schematic diagram of the front support assembly provided by the embodiments of the present application;

[0038] Figure 7 is a structural schematic diagram of the front support provided by the embodiments of the present application;

[0039] Figure 8 is a structural schematic diagram of the rear support assembly provided by the embodiments of the present application;

[0040] Figure 9 is a structural schematic diagram of the rear support provided by the embodiments of the present application.

[0041] In the drawings:

[0042] X, front-rear direction; Y, left-right direction; Z, vertical direction;

[0043] 100, base;

[0044] 200, front support assembly; 210, first support; 211, first adjusting mechanism; 2111, front suspension support seat; 2112, front suspension first locking ring; 2113, front suspension screw; 212, first platform; 2121, first table top; 2122, front suspension Y-direction first fixed block; 2123, front suspension Y-direction second fixed block; 2124, front suspension Y-direction third fixed block; 2125, front suspension Y-direction screw; 2126, left front sliding block; 2127, right front sliding block; 2128, second hand wheel; 220, front support; 221, first sliding seat; 222, first telescopic rod; 2221, front suspension second locking ring; 2222, front suspension second screw; 2223, third hand wheel; 223, first support tray; 224, first connector; 231, front suspension X-direction fixed part; 232, front suspension X-direction guide rail; 233, front suspension X-direction sliding block; 234, front suspension X-direction adjusting seat; 235, front suspension X-direction first screw; 236, first hand wheel; 24, bearing;

[0045] 300, rear support assembly; 310, second support; 311, second adjusting mechanism; 3111, loading electric cylinder; 3112, connecting lifting lug; 3113, force sensor; 312, second platform; 313, first support column; 314, second support column; 320, rear support; 321, second sliding seat; 322, second support tray; 323, second connector; 324, hinged ball head. DETAILED DESCRIPTION

[0046] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to be merely illustrative of the application and not in limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the application are shown in the drawings rather than all the parts.

[0047] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0050] like Figures 2 to 9 As shown, the present application provides a test platform, which includes a base 100, a front support assembly 200, and a rear support assembly 300. The front support assembly 200 includes a first bracket 210 and at least two front support members 220 arranged along the left-right direction Y. The first bracket 210 is slidably arranged on the base 100 along the front-back direction X and can be locked with the base 100. The front support members 220 are all slidably connected to the first bracket 210 along the left-right direction Y and can be locked with the first bracket 210. The front support members 220 are used to install the front suspension of the white body; the rear support assembly 300 includes a second bracket 310 and at least two rear support members 320 arranged along the left-right direction Y. The second bracket 310 is installed on the base 100. The rear support members 320 are all slidably arranged on the second bracket 310 along the left-right direction Y and can be locked with the second bracket 310. The rear support members 320 are used to install the rear suspension of the white body.

[0051] Specifically, the base 100 has a relatively large mass and can remain stationary relative to the ground. The front support assembly 200 and the rear support assembly 300 are spaced apart from each other on the base 100 in the front-to-back direction X. At least one of the front support assembly 200 and the rear support assembly 300 can slide relative to the base 100 in the front-to-back direction X, and the spacing between the front support assembly 200 and the rear support assembly 300 can be adjusted in the front-to-back direction X based on the structural characteristics of the body-in-white. In this embodiment, the front support assembly 200 can slide relative to the base 100, while the rear support assembly 300 is fixed relative to the base 100.

[0052] It should be noted that the structural characteristics of the body in white include its three-dimensional dimensions, namely length, width and height, as well as its outline shape.

[0053] like Figure 6 As shown, the front support assembly 200 further includes a front suspension X-direction fixing member 231, a front suspension X-direction guide rail 232, a front suspension X-direction slider 233, a front suspension X-direction adjustment seat 234, and a front suspension X-direction first screw 235. The front suspension X-direction fixing member 231 is fixedly mounted on the base 100; the front suspension X-direction guide rail 232 extends along the front-to-back direction X and is fixed to the front suspension X-direction fixing member 231; the first bracket 210 is slidably connected to the front suspension X-direction guide rail 232 via the front suspension X-direction slider 233; the front suspension X-direction adjustment seat 234 is fixedly connected to the front suspension X-direction fixing member 231; the front suspension X-direction first screw 235 passes through the front suspension X-direction adjustment seat 234 along the front-to-back direction X and is threadedly connected to the front suspension X-direction adjustment seat 234; one axial end of the front suspension X-direction first screw 235 is rotatably connected to the first bracket 210, and the two are relatively fixed along the front-to-back direction X. Thus, by rotating the front suspension X-direction first screw 235 , the first bracket 210 can be driven to move along the front-rear direction X relative to the base 100 .

[0054] Furthermore, the front support assembly 200 further includes a first hand wheel 236, which is mounted on the front suspension X-direction first screw rod 235. The first hand wheel 236 can drive the rotation of the front suspension X-direction first screw rod 235. In other embodiments, a motor drive may also be used.

[0055] The front support assembly 200 includes a first bracket 210 and at least two front support members 220. For example, in this embodiment, two front support members 220 are provided, designated as a left front support member and a right front support member. Both front support members 220 are mounted on the first bracket 210, and the first bracket 210 is capable of sliding relative to the base 100 along the front-to-back direction X. Thus, when the position in the front-to-back direction X needs to be adjusted, only the first bracket 210 needs to be moved to change the position of the two front support members 220 in the front-to-back direction X. During the movement, the relative positions of the two front support members 220 in the front-to-back direction X and the left-to-right direction Y can always be kept fixed. At least one of the two front support members 220 is capable of sliding relative to the first bracket 210 along the left-to-right direction Y. In this embodiment, both front support members 220 are slidably connected to the first bracket 210 to adjust the spacing in the left-to-right direction Y according to the structural characteristics of the body-in-white.

[0056] The rear support assembly 300 includes a second bracket 310 and at least two rear support members 320. For example, in this embodiment, two rear support members 320 are provided, which are respectively recorded as a left rear support member and a right rear support member. At least one of the two rear support members 320 can slide relative to the second bracket 310 along the left-right direction Y. In this embodiment, the two rear support members 320 are both slidably connected to the second bracket 310, and are used to adjust the spacing in the left-right direction Y according to the structural characteristics of the white body.

[0057] Optionally, the first bracket 210 includes a first adjustment mechanism 211 and a first platform 212. The first adjustment mechanism 211 connects the base 100 and the first platform 212, and can adjust the height of the first platform 212 in the vertical direction Z. The front support members 220 are all slidably set on the first platform 212.

[0058] like Figure 3 As shown, specifically, the first adjustment mechanism 211 includes a front suspension support seat 2111, a front suspension first locking ring 2112, and a front suspension screw 2113. The front suspension support seat 2111 is slidably mounted on the base 100, the front suspension screw 2113 is slidably inserted into the front suspension support seat 2111 along the vertical direction Z via a spline structure, the front suspension first locking ring 2112 is sleeved on the outside of the front suspension screw 2113 and threadedly connected, and the front suspension first locking ring 2112 can abut against the port of the front suspension support seat 2111 along the vertical direction Z, and one axial end of the front suspension screw 2113 is fixed to the first platform 212. In this way, by screwing the front suspension first locking ring 2112, the axial position of the front suspension first locking ring 2112 on the front suspension screw 2113 is changed, and then the insertion depth of the front suspension screw 2113 and the front suspension support seat 2111 is changed to adjust the height of the first bracket 210 in the vertical direction Z.

[0059] In other embodiments, one end of the front suspension screw 2113 is threadedly connected to the front suspension support seat 2111 , and the other end is rotatably connected to the first bracket 210 , and the front suspension screw 2113 and the first bracket 210 are relatively fixed in the vertical direction Z.

[0060] like Figure 4As shown, specifically, the first platform 212 includes a first table 2121, a front suspension Y-direction first fixing block 2122, a front suspension Y-direction second fixing block 2123, a front suspension Y-direction third fixing block 2124, a front suspension Y-direction screw 2125, a left front slider 2126, and a right front slider 2127. The front suspension Y-direction first fixing block 2122, the front suspension Y-direction second fixing block 2123, and the front suspension Y-direction third fixing block 2124 are fixed to the first table 2121 in sequence along the left-right direction Y, and the front suspension Y-direction screw 2125 is rotatably connected to the three in sequence. The threads of the front suspension Y-direction screw 2125 are arranged in opposite directions on the left and right sides of the front suspension Y-direction second fixing block 2123. The left front slider 2126 is threadedly connected to the front suspension Y-direction screw 2125 and is located at the front suspension Y-direction first fixing block. Between the fixed block 2122 and the second Y-direction fixed block 2123 of the front suspension, the right front slider 2127 is threadedly connected to the front suspension Y-direction screw 2125 and is located between the third Y-direction fixed block 2124 of the front suspension and the second Y-direction fixed block 2123 of the front suspension. By rotating the front suspension Y-direction screw 2125, the left front slider 2126 and the right front slider 2127 can be moved closer to or away from each other. The left front slider 2126 is used to install the left front support member, and the right front slider 2127 is used to install the right front support member.

[0061] Furthermore, the first platform 212 further includes a second hand wheel 2128, which is connected to the front suspension Y-direction screw rod 2125 and is used to drive the front suspension Y-direction screw rod 2125 to rotate. In other embodiments, a motor drive is adopted.

[0062] like Figure 5 As shown, optionally, the front support member 220 includes a first sliding seat 221, a first telescopic rod 222 and a first support tray 223, the first sliding seat 221 can slide relative to the first platform 212, the first telescopic rod 222 connects the first support tray 223 and the first sliding seat 221 and can adjust the height of the first support tray 223 in the vertical direction Z.

[0063] Illustratively, the first sliding seat 221 of the left front support member is fixed to the left front slider 2126, while the first sliding seat 221 of the right front support member is fixed to the right front slider 2127. The first telescopic rod 222 includes a front-mounted second locking ring 2221, a front-mounted second screw 2222, and a third handwheel 2223. The front-mounted second screw 2222 is inserted into the first sliding seat 221 along the vertical direction Z. The third handwheel 2223 is rotationally connected to the first sliding seat 221 and forms a worm gear structure with the front-mounted second screw 2222. Rotating the third handwheel 2223 allows the front-mounted second screw 2222 to move along the vertical direction Z. A first support tray 223 is mounted on top of the front-mounted second screw 2222. The front-mounted second locking ring 2221 is sleeved around the front-mounted second screw 2222 and threadedly connected thereto, enabling it to abut against the first sliding seat 221 along the vertical direction Z.

[0064] like Figure 7 As shown, optionally, the front support member 220 further includes a first connector 224 , the first connector 224 is detachably connected to the first support tray 223 , and the front suspension of the body-in-white is connected to the first connector 224 via a bearing 24 .

[0065] Specifically, a mounting hole is provided at the top end of the first connector 224 along the left-right direction Y, and the bearing 24 is installed in the mounting hole. The outer ring of the bearing 24 is fixed relatively to the first connector 224, and the front suspension of the body-in-white is fixed to the inner ring of the bearing 24. In this way, the freedom of the front suspension of the body-in-white in the front-to-back direction X, the left-to-right direction Y, the vertical direction Z, the rotation direction around the front-to-back direction X, and the rotation direction around the vertical direction Z is restricted, so that the front suspension of the body-in-white can only rotate around an axis parallel to the left-to-right direction Y.

[0066] like Figure 8 As shown, optionally, the second bracket 310 includes a second adjustment mechanism 311 and a second platform 312, one end of the second adjustment mechanism 311 is connected to the base 100, and the other end is hinged to the second platform 312, and the second adjustment mechanism 311 can adjust the height of the second platform 312 in the vertical direction Z, and can also change the height difference between the two ends of the second platform 312 in the left and right directions Y.

[0067] Exemplarily, in this embodiment, two second adjustment mechanisms 311 are provided, which are spaced apart in the left and right directions Y. When the two second adjustment mechanisms 311 move in the same direction in the vertical direction Z at the same time, the height of the second platform 312 in the vertical direction Z can be changed. When the two second adjustment mechanisms 311 move in opposite directions in the vertical direction Z, the second platform 312 can be tilted, thereby applying torque to the rear suspension of the body-in-white.

[0068] In this embodiment, the second adjustment mechanism 311 includes a loading electric cylinder 3111 . The fixed portion of the loading electric cylinder 3111 is mounted on the base 100 , and the telescopic portion of the loading electric cylinder 3111 is hinged to the second platform 312 .

[0069] Specifically, the second adjustment mechanism 311 further includes a connecting lug 3112 , which is fixed to the second platform 312 , and the telescopic end of the loading electric cylinder 3111 is hinged to the second platform 312 through the connecting lug 3112 .

[0070] Furthermore, the second adjustment mechanism 311 also includes a force sensor 3113 for detecting the force applied to the loading cylinder 3111. Generally, during normal operation, the force sensor feedback value exhibits a smooth, gradually increasing trend. If this trend fluctuates, damage to the structure of the second adjustment mechanism 311 is determined, triggering an alarm and halting the test.

[0071] Optionally, the second bracket 310 also includes a first support column 313, one end of the first support column 313 is connected to the base 100, and the other end is hinged to the second platform 312, the first support column 313 can be extended or locked along the vertical direction Z, and the second adjustment mechanism 311 is located on one side of the first support column 313 in the left and right direction Y.

[0072] For example, in this embodiment, two second adjustment mechanisms 311 are provided, which are respectively located on the left and right sides of the first support column 313. The first support column 313 mainly supports the second platform 312. The two second adjustment mechanisms 311 can form a lever model with the second platform 312 with the first support column 313 as the fulcrum.

[0073] Furthermore, the second bracket 310 also includes a second support column 314, the two ends of which are respectively connected to the base 100 and the second platform 312, for assisting the first support column 313 in supporting the second platform 312, and the second support column 314 is located on one side of the first support column 313 in the left-right direction Y. The second support column 314 can be extended and locked in the vertical direction Z. During the debugging process before the test, when the second platform 312 needs to move in the vertical direction Z, the second adjustment mechanism 311 is used as an active component to drive the second platform 312 to move in the vertical direction Z, and the first support column 313 and the second support column 314 are both followers, which are extended and retracted in the vertical direction Z under the drive of the second platform 312. After the debugging is completed, if the torsion test of the body in white is performed, The first support column 313 is locked in the length of the vertical direction Z, and the second support column 314 is still in a follow-up state. The first support column 313 and the second platform 312 form a lever model. The second adjustment mechanism 311 applies a force on one side of the first support column 313, so that the second platform 312 can swing around the axis parallel to the front-rear direction X with the first support column 313 as the fulcrum; if a bending and torsion test of the white body is performed, the first support column 313 and the second support column 314 are both locked in the height of the vertical direction Z to support the second platform 312, and the second support column 314 can limit the rotation of the second platform 312 relative to the first support column 313. At this time, the second adjustment mechanism 311 is in standby and no longer actively changes the force applied to the second platform 312.

[0074] Optionally, the rear support member 320 includes a second sliding seat 321, a second support tray 322 and a second connector 323, the second sliding seat 321 is slidingly connected to the second platform 312, the second support tray 322 is relatively fixed to the second sliding seat 321, the second connector 323 and the second support tray 322 are detachable, and the rear suspension of the white body is ball-hingedly connected to the second connector 323.

[0075] Specifically, the detachable design of the second connector 323 and the second support tray 322 allows for replacement of the second connector 323 based on the structural features of the BIW. The second connector 323 has mounting holes along the left-right direction Y, into which the articulation ball 324 is mounted. The rear suspension of the BIW is secured to the articulation ball 324.

[0076] like Figure 1 As shown, the present invention provides a method for testing the static stiffness of a body-in-white, comprising:

[0077] S10. Adjust the positional relationship between the supporting members according to the structural characteristics of the body-in-white;

[0078] S20, installing the front and rear suspensions of the body-in-white on corresponding support members respectively;

[0079] S30, adjusting the support members so that all the support members are subjected only to the vertical downward force exerted by the body-in-white;

[0080] S41. Apply at least one preload F to the body in white. 预 ;

[0081] S42, apply a formal load F to the body in white, and the size of the formal load is applied step by step from low to high, and collect the data of the longitudinal beam of the body in white step by step, satisfying F 预 <F;

[0082] S43. Calculate the static stiffness of the body in white based on the data.

[0083] In conjunction with the test platform provided by the present invention, the specific execution steps of the above-mentioned body-in-white static stiffness testing method are as follows:

[0084] S0, determining whether the first platform 212 and the second platform 312 are both in a horizontal state, if so, executing S10; if not, adjusting the first platform 212 and / or the second platform 312 that are in a non-horizontal state to a horizontal state;

[0085] In this embodiment, the horizontal state of the first platform 212 and / or the second platform 312 is obtained by a level ruler, and the first platform 212 and / or the second platform 312 are adjusted to be horizontal by changing the first adjustment mechanism 211 and / or the second adjustment mechanism 311 .

[0086] S10. Adjust the positional relationship between the supporting members according to the structural characteristics of the body-in-white;

[0087] In this embodiment, the structural features of the body-in-white (BIW), including its outline shape, length, width, and height, are measured. The relative positions of the front support assembly 200 and the rear support assembly 300 are adjusted in the front-to-back direction X, and the relative positions of the two front support members 220 and the two rear support members 320 are adjusted in the left-to-right direction Y. The first adjustment mechanism 211 and the second adjustment mechanism 311 are capable of varying the height in the vertical direction Z.

[0088] S20, installing the front and rear suspensions of the body-in-white on corresponding support members respectively;

[0089] S30, adjusting the support members so that all the support members are subjected only to the vertical downward force exerted by the body-in-white;

[0090] This is used to eliminate the internal stress generated in the body-in-white during the installation process.

[0091] After completing the above preparations, the body-in-white needs to be tested for static stiffness. Generally, static stiffness tests are divided into torsional stiffness tests and bending stiffness tests. The following introduces the two tests separately:

[0092] When performing torsional stiffness testing:

[0093] S41: Apply a first preload F to the body-in-white at least once in both clockwise and counterclockwise directions. 预1 ;

[0094] In this embodiment, a first preload is applied to the BIW three times in the clockwise and counterclockwise directions respectively. The torque value generated by the first preload is half of the maximum torque value of the test, which is used to eliminate the influence of the connection gap between the BIW and the fixture, the sinking of the BIW, etc. on the measurement results.

[0095] S42, apply a first load F1 to the rear suspension of the body-in-white in clockwise and counterclockwise directions respectively, and apply the first load step by step from low to high, and collect the deformation value of the longitudinal beam of the body-in-white step by step, and satisfy F 预1 <F1;

[0096] In this embodiment, torque is applied step by step to the rear suspension of the body in white. The deformation values ​​of each point on the longitudinal beam are collected once at each level. A minimum of four levels of loading are applied until the maximum torque is specified. This is done three times each in clockwise and counterclockwise directions.

[0097] S43, calculating the torsion angle and torsional stiffness according to the deformation value obtained in S42;

[0098] Calculate the torsional stiffness of the body-in-white / cab using the following formula:

[0099]

[0100] Δθ=θ r -θ f

[0101]

[0102] Where:

[0103] θ—twist angle;

[0104] θ r —Rear suspension torsion angle;

[0105] θ f —Front suspension torsion angle;

[0106] Δθ—relative torsion angle;

[0107] K t — torsional stiffness;

[0108] M—applied torque;

[0109] d fl d fr —Absolute value of deformation of left and right sensors of front suspension;

[0110] d rl d rr —Absolute value of deformation of the left and right sensors of the rear suspension;

[0111] Y f 、Y r —The distance between the left and right sensors of the front and rear suspension.

[0112] The relative torsion angle, the torsion angle correction value obtained relative to the front suspension, is used to calculate the torsional stiffness, which can eliminate the systematic error caused by the deformation of the test bench.

[0113] When performing bending stiffness testing:

[0114] S41, apply a second preload F to the cab position of the body in white 预2 , the second preload is perpendicular to the body in white;

[0115] In this embodiment, a second preload perpendicular to the BIW is applied to the cab of the BIW three times. The value of the second preload is half of the maximum load to eliminate the influence of the gap between the BIW and the fixture, the sinking of the BIW, etc. on the test results.

[0116] S42, apply multiple second loads F2 to the seat fixing position of the body-in-white. The second load is perpendicular to the body-in-white. The magnitude of the multiple second loads is applied step by step from low to high, and the deflection of the longitudinal beam of the body-in-white is collected step by step to meet the following requirements: F 预2 <F2;

[0117] In this embodiment, a second load F2 is applied to the seat fixing point of the body in white, and the deflection of the longitudinal beam on one side is collected at each level. It is best to use 4 levels of loading until the specified maximum load is reached.

[0118] S53. Calculate the bending stiffness based on the deflection.

[0119] Calculate the torsional stiffness of the body-in-white / cab using the following formula:

[0120] K b =F / Δδ

[0121] Δδ=δ-δ f

[0122] Where:

[0123] K b - bending stiffness;

[0124] F-bending load;

[0125] Δδ-relative deflection;

[0126] δ f- Deflection of the front suspension fixing point;

[0127] δ-maximum deflection.

[0128] The relative deflection, the deflection correction value obtained relative to the front suspension, is used to calculate the bending stiffness, which can eliminate the systematic error caused by the deformation of the test bench.

[0129] Optionally, the support member limits the freedom of movement of the rear suspension of the body-in-white in the front-rear direction X. In this way, the accuracy of the test can be increased.

[0130] Optionally, the support member limits the front suspension of the BIW in the longitudinal direction X, the lateral direction Y, the vertical direction Z, the rotational direction about the longitudinal direction X, and the rotational direction about the vertical direction Z. This can increase the accuracy of the test.

[0131] Furthermore, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. Body-in-white static stiffness test method, characterized in that: include: S10. Adjust the positional relationship between the supporting members according to the structural characteristics of the body-in-white; S20, installing the front and rear suspensions of the body-in-white on the corresponding support members respectively; S30, adjusting the support members so that all the support members are subjected only to the vertical downward force exerted by the body-in-white; S41, applying a preload F to the body-in-white at least once 预 ; S42, applying a formal load F to the body-in-white, and applying the formal load step by step from low to high, and collecting data of the longitudinal beams of the body-in-white step by step, to meet F 预 <F; S43. Calculate the static stiffness of the body-in-white according to the data.

2. The body-in-white static stiffness testing method according to claim 1, characterized in that: The support member limits the freedom of movement of the rear suspension of the body-in-white in the front-rear direction (X).

3. The body-in-white static stiffness testing method according to claim 2, characterized in that: The support member limits the front suspension of the white body to move in the front-to-back direction (X), the left-to-right direction (Y), the vertical direction (Z), the rotation direction around the front-to-back direction (X) and the rotation direction around the vertical direction (Z).

4. A test platform, suitable for the body-in-white static stiffness test method according to any one of claims 1 to 3, characterized in that: The test platform includes: Base (100); A front support assembly (200), comprising a first bracket (210) and at least two front support members (220) arranged along a left-right direction (Y), wherein the first bracket (210) is slidably arranged on the base (100) along a front-back direction (X) and can be locked with the base (100), and the front support members (220) are all slidably connected to the first bracket (210) along the left-right direction (Y) and can be locked with the first bracket (210), and the front support members (220) are used for installing a front suspension of a body-in-white; A rear support assembly (300) includes a second bracket (310) and at least two rear support members (320) arranged along the left-right direction (Y), the second bracket (310) is mounted on the base (100), the rear support members (320) are all slidably arranged on the second bracket (310) along the left-right direction (Y) and can be locked with the second bracket (310), and the rear support members (320) are used to install the rear suspension of the white body.

5. The test platform according to claim 4, characterized in that: The first bracket (210) includes a first adjustment mechanism (211) and a first platform (212). The first adjustment mechanism (211) connects the base (100) and the first platform (212) and is capable of adjusting the height of the first platform (212) in a vertical direction (Z). The front support members (220) are all slidably arranged on the first platform (212).

6. The test platform according to claim 5, characterized in that: The front support member (220) comprises a first sliding seat (221), a first telescopic rod (222) and a first support tray (223); the first sliding seat (221) is capable of sliding relative to the first platform (212); the first telescopic rod (222) connects the first support tray (223) and the first sliding seat (221) and is capable of adjusting the height of the first support tray (223) in the vertical direction (Z).

7. The test platform according to claim 6, characterized in that: The front support member (220) further comprises a first connector (224), the first connector (224) being detachably connected to the first support tray (223), and the front suspension of the body-in-white being connected to the first connector (224) via a bearing (24).

8. The test platform according to claim 4, characterized in that: The second bracket (310) includes a second adjusting mechanism (311) and a second platform (312). One end of the second adjusting mechanism (311) is connected to the base (100), and the other end is hinged to the second platform (312). The second adjusting mechanism (311) can adjust the height of the second platform (312) in the vertical direction (Z) and change the height difference between the two ends of the second platform (312) in the left-right direction (Y).

9. The test platform according to claim 8, characterized in that: The second adjustment mechanism (311) includes a loading electric cylinder (3111), a fixed portion of the loading electric cylinder (3111) is mounted on the base (100), and a telescopic portion of the loading electric cylinder (3111) is hinged to the second platform (312).

10. The test platform according to claim 9, characterized in that: The second regulating mechanism (311) further includes a force sensor (3113), and the force sensor (3113) is used to obtain the force condition of the loading electric cylinder (3111).

11. The test platform according to claim 9, characterized in that: The second bracket (310) also includes a first support column (313), one end of the first support column (313) is connected to the base (100), and the other end is hinged to the second platform (312), the first support column (313) can be extended or locked along the vertical direction (Z), and the second adjustment mechanism (311) is located on one side of the first support column (313) in the left-right direction (Y).

12. The test platform according to claim 8, characterized in that: The rear support member (320) includes a second sliding seat (321), a second support tray (322) and a second connector (323); the second sliding seat (321) is slidably connected to the second platform (312); the second support tray (322) and the second sliding seat (321) are relatively fixed; the second connector (323) and the second support tray (322) are detachably arranged; and the rear suspension of the body-in-white is connected to the second connector (323) via a ball hinge.

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