White car body static stiffness restriction device and static stiffness detection method

Abstract

The invention discloses a white car body static stiffness restriction device of a passenger car and a static stiffness detection method. The device is characterized in that: one side of a front bearing support is provided with a pressure transducer and a hydraulic jack, a plurality of displacement sensors are arranged at the periphery of the white car body bottom surface; the front bearing support comprises a front rack, a T-shaped rack, and a I-shaped guide rail, wherein, the end portion of the front rack is connected with the very center of a crossbeam of the T-shaped rack through bolts and nuts, the crossbeam of the T-shaped rack is arranged at the left and right side of the white car body, and the lower side of the crossbeam is provided with the hydraulic jack; the bottom of the T-shaped rack is connected with the bottom of the front rack through a pin roll and a split pin; the upper surface of the crossbeam of the T-shaped rack is symmetrically provided with I-shaped guide rails; a torque value of the applied load is divided by a twisting angle to calculate a twisting stiffness, and the actual value of the load is divided by a car body deformation displacement to obtain a bending stiffness. According to the invention, the efficiency of various vehicle tests is increased, and the device cost is obviously reduced on the premise that the test accuracy is guaranteed.

Description

technical field [0001] The invention relates to a static stiffness detection of a body-in-white of a passenger car, in particular to a restraint device and a detection method for the static stiffness of a body-in-white, which can quickly test the torsional stiffness and bending stiffness of the body. Background technique [0002] The vast majority of passenger car bodies adopt a full load-bearing structure. The static stiffness of the body generally includes torsional stiffness and bending stiffness. The body almost bears all the torsional and bending loads during the use of the passenger car. Therefore, the static stiffness of passenger car body is the primary issue to be considered in the process of body structure design. At present, the static stiffness performance test of the body mainly uses mature CAD, CAE and other software to model the body in three dimensions, and then use the finite element method to analyze the deformation of the body in white and its structural p...

AI Technical Summary

Problems solved by technology

The advantage of this method is that the design cost is low, but because the car body structure is relatively complex, and the body structure parameters of different models are also different, so the solid modeling takes a long time. In addition, due to certain simplifications in the modeling process, the calculation of stiffness Big difference from the actual stiffness

[0003] The patent literature with the Chinese patent number CN1405545 discloses the "Constraint and Loading Device for Bending Rigidity Test of Passenger Car Body-in-White Structure", which involves the restraint device and the bending loading device used to support the body of the test vehicle during the bending stiffness test of the body-in-white, but does not involve to bending deflection measurement methods, signal acquisition and data processing technologies

[0004] Chinese Patent No. CN1405542 discloses the technology of "Constraint and Loading Device for Torsional Rigidity Test of Passenger Car Body Structure", including the restraint device and torsional stiffness loading device used to support the body of the test vehicle during the torsional stiffness test of the body-in-white, but the same Does not involve torsion angle measurement methods, signal acquisition and data processing technologies

However, this structure has shortcomings, that is, when the system bending stiffness test is performed, because the front support assembly cannot be fixed to the floor of the test bench, after the bending load is loaded, the body-in-white will not only bend as required for the bending stiffness test, but also Body torsion still occurs, introducing large errors in bending stiffness test results

In addition, although the patent also mentioned the test system, it did not give the composition of the test system

[0006] To sum up, the current existing technology either does not involve the construction of the stiffness test system; or does not involve the data acquisition and processing during the stiffness and bending test; or the vehicle body stiffness test system lacks a comprehensive test platform including torsion and bending; or The system has measurement errors due to insufficient structure

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