Fatigue Enhancement Mechanism of a New Wideband Random Vibration Environment
The omni-axis random vibration environment of repetitive shock machine ，a new vibration equipment for reliability enhancement testing, is extensively used abroad. Fatigue enhancement mechanism of the omni-axis random vibration environment is one of the key techniques to develop the reliability enhancement testing. This paper studies the Fatigue enhancement mechanism of its broad bandwidth characteristic which is extracted based on vibration signal sample test and analysis. Firstly the new omni-axis vibration acceleration is sampled by using triple axis accelerator under different intensity of vibration and the wideband spectrum characteristic is validated. Secondly the directly related parameters to estimate fatigue from its power spectrum density function are roundly analyzed, such as expected peek circulation number P E , expected zero plus crossing ratio r N , spectrum irregularity factor α . And then three leading conclusions about fatigue enhancement of P E , r N and α are deduced and reached. Thirdly constructing tow series representing two kind of random stresses of the equivalent mean and RMS, the influence of different bandwidth of equivalent mean and RMS random stresses is illustrated based on above drawn conclusions by analyzing the spectrum parameters P E , r N and α of the two constructed stresses series. And then the fatigue enhancement mechanism of the broad bandwidth spectrum characteristic of the new vibration environment is demonstrated. Finally a numeric example calculation is given and the result is coincident with the above conclusion.
Random Vibration Reliability Enhancement Testing Fatigue Damage Random Stresses Power Spectral Density
JIANG Pei LIU Zhengming ZHANG Xiaobing
Naval University of Engineering Wuhan, Hubei Province 430033 PRC
国际会议
北京
英文
2007-08-05（万方平台首次上网日期，不代表论文的发表时间）