High-efficiency high-precision white vehicle body static stiffness measurement system and test method

Abstract

The invention relates to an efficient high-precision white vehicle body static stiffness measurement system and a test method. The measurement system comprises a front suspension constraint support device, a rear suspension constraint support device, a pre-support device and a servo loading system, the X-Y direction position of the front suspension constraint support device is adjustable, and theheight and the left-right position of the upper front suspension support device are adjustable. The T-shaped table can rotate around the Z axis, the X-direction position and the Y-direction position of the rear overhang constraint supporting device are adjustable, the height of the rear overhang constraint supporting device is adjustable, the pre-supporting device is erected below a left thresholdbeam and a right threshold beam of a white vehicle body in a test, the height of the pre-supporting device is adjustable, and the servo loading system is used for bending loading or torsion loading of the white vehicle body. According to the invention, the body-in-white can be conveniently centered with the test bed after being hoisted and the posture of the body-in-white can be adjusted to be horizontal with the ground, so that internal stress generated in the installation process can be effectively avoided and the measurement result is more accurate.

Description

technical field [0001] The invention relates to the technical field of static stiffness measurement of automobile body-in-white, in particular to a high-efficiency and high-precision static stiffness measurement system and testing method of body-in-white; Background technique [0002] The static stiffness of the body-in-white of a car is an important performance index of the body structure of a passenger car. The quality of the static stiffness of the body-in-white will affect the safety, handling, comfort, and NVH performance indicators of the car. Therefore, the design of the static stiffness of the body-in-white , simulation and experiment are of great significance. At present, the static stiffness value of the body-in-white obtained by calculation and simulation is more idealized. However, the actual body-in-white is affected by the manufacturing and processing technology, and its overall static stiffness performance has a certain gap with the simulation results. Theref...

AI Technical Summary

Problems solved by technology

[0005] To sum up: firstly, the current static stiffness test system of the body-in-white is a device and method that only considers constraints and loading. The axes are not on the same plane, and the door sill beam of the body-in-white is not level with the ground after hoisting, which eventually leads to the failure to eliminate the internal stress of the installation, the bending load and the body cannot maintain the plumb weight, and the test results are not accurate enough

Second, since most of the displacement measuring devices in the test use dial indicators or displacement sensors, the displacement sensors are light in weight and easy to install, but because the output is a voltage signal, they are more susceptible to signal interference in the laboratory

Although the precision of the dial gauge is high, the mass of the dial gauge is relatively large, and the stability of the existing bracket is poor

Third, because the displacement measurement device requires the axis of the telescopic rod to be kept horizontal to the displacement direction of the side, but it is difficult to realize the actual installation process of the existing device, the above two points will cause the measured displacement value to be inaccurate, and then the stiffness value cannot be achieved. accurate calculation

At present, it takes a lot of manpower and time to align and level the body-in-white and the test bench as much as possible, and to vertically adjust the axis of the telescopic rod of the measuring device, and the adjustment results are not ideal.

[0006] There are no mature technical solutions for the above three points to apply for patents. However, with the development of the automobile industry, more and more models are put into research and development, so there is an urgent need for a complete set of high-efficiency, accurate and reliable test data. Corresponding test operation method

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