Load analysis method for four-wheel six-component road spectrum of finished automobile

Abstract

The invention relates to a load analysis method for a four-wheel six-component road spectrum of a finished automobile. The method comprises the following steps: 1 testing a four-wheel six-component road spectrum of a finished automobile; 2 collecting the design data of the finished automobile; 3 building and adjusting a dynamic model of the finished automobile; 4 carrying out virtual iteration; 5 obtaining Z-direction displacement of a wheel center; 6 decomposing the load of the finished automobile; 7 processing the load result. The six components of four wheel centers of the finished automobile are directly measured as external road excitation input; the actual stress condition of each wheel center under the typical characteristic road excitation of test site reliability is reflected; the technical effect of obtaining the load of the finished automobile system and spare parts is realized by a virtual iteration technique and a dynamics simulation technique; the anti-fatigue performance of the finished automobile structure can be accurately predicted and optimized at the earlier stage; problem rectification of the sample automobile stage is reduced; the research and development cycle is shortened; the research and development cost is also reduced.

Description

technical field [0001] The invention relates to a load analysis method, in particular to a road spectrum load analysis method of the four-wheel six-component force of the whole vehicle. Background technique [0002] Reliability is a very important product quality in automobile research and development. The primary problem of automobile reliability design is to obtain the load environment of various systems and components of automobile structure in user use. At present, the loads required for the structural fatigue analysis of most domestic automobile manufacturers mainly use the traditional test bench empirical loads, which are poorly correlated with the user's road and test field loads. The lack of real road loads leads to blindness in the design of automobile products, resulting in overdesign of the fatigue durability of the vehicle structure, increasing the thickness of the sheet metal, and increasing the weight of the vehicle, thereby increasing product costs; or the des...

AI Technical Summary

Problems solved by technology

In "Analysis Method of Body Dynamic Strength" (Patent No.: ZL200810141691.1), the acceleration of the tested wheel center is used as the excitation for simulation, and the accuracy of the obtained load is not high, which cannot truly reflect the force of the various systems and parts of the vehicle

At present, most manufacturers use six-component force wheel sensors to measure the road load of the vehicle, but if the measured six-component force of the wheel center is directly applied to the vehicle multi-body dynamics model for simulation, the drift of the vehicle will diverge and not converge and cannot solve

Therefore, two methods are usually used to obtain the loads of various systems and components: the first method is to simulate the whole vehicle by fixing the body, and the second method is to simulate the whole vehicle by constraining the body by springs. Although the road spectrum fatigue load of the whole vehicle can be simulated, in practice The body is in a free state during driving. Due to the additional body constraints, the fatigue load spectrum of the vehicle is very inaccurate and has low precision, which is not conducive to the quantitative evaluation of the fatigue analysis results of the vehicle, and even wrong risk assessment.

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