Force-displacement hybrid control motorcycle frame fatigue test method

Abstract

The invention discloses a force-displacement hybrid control motorcycle frame fatigue test method which comprises the following steps that 1), finite element analysis is performed on a motorcycle frame, and a road load spectrum during actual running is acquired in a durability test road; 2), the road load spectrum is subjected to analysis processing and validity check, and a concentrated load spectrum is obtained; 3), a motorcycle frame assembly is mounted on a test system, and a frequency response function and a coherence function are calculated; 4), a frequency response function for calculating an excitation driving signal is constructed; and 5), a corresponding strain signal and an acceleration signal are extracted from the concentrated load spectrum, and driving signals of two vibration exciters are calculated. According to the test method, a force-displacement hybrid control mode is adopted, so that an actual stress situation of the motorcycle frame is completely matched; decoupling of a multi-axial and multi-excitation test is achieved; very high simulation precision can be obtained; and simulation points are found out by coherence analysis, and the load spectrum is concentrated, so that a test period is shortened greatly.

Description

technical field [0001] The invention relates to a motorcycle frame fatigue test method, in particular to a force-displacement mixed control motorcycle frame fatigue test method. Background technique [0002] The motorcycle frame is the most critical bearing part of the motorcycle, and its structural strength and fatigue reliability are one of the most basic performances of the motorcycle. Whether it is a new design of motorcycle frame, or improved design and optimized design, fatigue test is an indispensable and important link. At present, the fatigue test of motorcycle frame mainly adopts road test, proving ground test and indoor bench test. Among them, the road test and proving ground test require a long cycle, poor repeatability, and high risk, while the indoor bench test has a strong demand in the motorcycle frame fatigue test because of its short cycle, good repeatability, safety and reliability, etc. and broad application prospects. Due to the lack of test equipment...

AI Technical Summary

Problems solved by technology

As a very complicated component like a motorcycle frame, to reproduce the running load of each part of the frame, many exciters

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