Longitudinal multi-level spectrum loading test bed provided with control arm assembly and used for auxiliary frame as well as test method adopting test bed

Abstract

The invention discloses a longitudinal multi-level spectrum loading test bed provided with a control arm assembly and used for an auxiliary frame as well as a test method adopting the test bed. The test bed comprises a first combination support used for fixing the auxiliary frame and two drivers used for applying load to ball pins on control arms on two sides of the auxiliary frame, wherein the drivers are connected with the ball pins through ball pin loading clamps, and the ball pin loading clamps are connected with guide clamps. According to the longitudinal multi-level spectrum loading test bed provided with the control arm assembly and used for the auxiliary frame as well as the test method adopting the test bed, the road test stress condition can be reflected, fatigue performance of parts under different loads is considered, a road test failure mode is reproduced, so that operational features of the parts and test load spectrums of a testing field can be reflected more truly, and the test precision is higher than that of constant amplitude loading; meanwhile, test frequency is controlled through damage equivalence, the test period is greatly shortened, the test efficiency is improved, and early-stage development and verification of the parts are facilitated.

Description

technical field [0001] The invention belongs to the technical field of automobile product testing. Specifically, the invention relates to a longitudinal multi-stage spectrum (hereinafter referred to as Block load spectrum) loading test bench of a subframe with a control arm assembly and a test method thereof. Background technique [0002] At present, most of the bench fatigue tests of the front subframe of passenger cars adopt two methods of equal amplitude loading and random loading. Among them, the random loading fatigue test can well reproduce the loading conditions of the road test, which is closer to the actual situation, but due to its long test period and high cost, it is generally not suitable for the early development of parts. The constant amplitude loading fatigue test is the fastest, simplest, most direct, lowest cost, and most frequently used laboratory bench test method, but it also has certain limitations. Due to the single load, it cannot reflect the road tes...

AI Technical Summary

Problems solved by technology

Among them, the random loading fatigue test can well reproduce the loading conditions of the road test, which is closer to the actual situation, but due to its long test period and high cost, it is generally not suitable for the early development of parts

The constant amplitude loading fatigue test is the fastest, simplest, most direct, lowest cost, and most frequently used laboratory bench test method, but it also has certain limitations. Due to the single load, it cannot reflect the road test. The loading conditions of the parts cannot reflect the fatigue performance of the parts under different loads; the occasional overload may cause the parts to produce plastic deformation in the high stress concentration area, resulting in the redistribution of stress, and the residual stress will affect the fatigue of the whole part performance

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