Method for analyzing load of chassis part

Abstract

The invention discloses a method for analyzing the load of a chassis part. The method comprises the following steps: (1) acquiring data of a test field load spectrum of the chassis part; (2) carrying out KLT road surface filtration on the test field load spectrum of the chassis part; (3) carrying out rain flow counting and accumulated damage calculation on the test field load spectrum of the chassis part; (4) determining block spectrum load amplitude and equivalent damage cycle index of the chassis part; and (5) evaluating an equivalent block spectrum of the chassis part. According to the method disclosed in the invention, the test field load spectrum, acquired according to a reliability test specification, of the chassis part is taken as input, and KLT road surface RP filtration and rain flow counting are carried out on the test field load spectrum, and Miner fatigue accumulated damage criterion is utilized to calculate the total damage of S-N curves, so that the load analysis, taking an equivalent damage as target, from the test field load spectrum to the equivalent block spectrum of the chassis part is realized. The method disclosed in the invention is capable of ensuring the consistency between the design, CAE analysis and DV test load of the chassis part and the test field load of the chassis part, unifying the evaluation standard, shortening the analysis and test time and enhancing the analysis and test efficiency.

Description

technical field [0001] The invention relates to a load analysis method for automobile chassis parts. Background technique [0002] The structural design and development of automobile chassis parts needs to go through the key links of CAE analysis, optimization and DV test verification in the early stage. After meeting the design goals, it can enter the later stage of vehicle reliability road test verification. [0003] At present, the load at each attachment point of the chassis is mainly output through the multi-body dynamics simulation of the whole vehicle as the load input of CAE fatigue analysis for structural fatigue analysis and optimization. Due to the long time history of the load spectrum collected in the test field, under the existing software and hardware conditions, the multi-body dynamics simulation cycle is long, the efficiency of CAE analysis and optimization is low, and the progress of product development is often not guaranteed. [0004] The DV test verific...

AI Technical Summary

Problems solved by technology

Due to the long time history of the load spectrum collected in the test field, under the existing software and hardware conditions, the multi-body dynamics simulation cycle is long, the efficiency of CAE analysis and optimization is low, and the progress of product development is often not guaranteed

[0004] The DV test verification cannot use the actuator to reproduce the internal force load excitation in real time, so the DV test can only be completed by means of dynamic simulation or empirical load loading

Dynamic simulation needs to obtain the excitation load of the test in an iterative manner. For the case of multi-axis coupling force, the requirements for the iterative scheme, the ability of the actuator and the design of the tooling bench are very high. Not only is the manufacturing cost of the bench expensive, but the error is within The RMS iterative accuracy requirement within 5% is also difficult to achieve, and the test period is long; the bench test is carried out according to the empirical load loading method, and the damage correlation between the empirical load (larger safety factor) and the road load of the test site cannot be guaranteed. There is an abnormal phenomenon that the parts are cracked in the bench test but not in the road test, which is not conducive to the accurate evaluation of the lightweight design of the chassis parts and the weight reduction and cost reduction

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