宽带随机振动疲劳寿命的频域分析与试验对比研究

Comparison of the Frequency-domain Analysis and the Test Results for a Wide-band Random Vibration Fatigue Problem

摘要: 介绍了几种常见的宽带随机振动疲劳寿命频域估算方法,包括P.H.Wirsching窄带假设法,Dirlik法,Bi-modal法和简化的Bi-modal法等。并专门设计若干组具有明显双模态响应的悬臂梁随机振动疲劳试验,通过采集到的应变数据获得应力数据,采用上面介绍的各种频域估算方法估算试件的振动疲劳寿命,并与试验寿命比较,以此验证各种频域估算方法的适用性和估算精度。
- 宽带随机振动 /
- 疲劳寿命估算 /
- 频域分析 /
- 振动疲劳试验
Abstract: To estimate the fatigue life for a wide-band random vibration fatigue problem, several frequency domain analysis methods are introduced and studied in this paper, which are presented by P.H.Wirsching, Dirlik, T.T.Fu and the authors.The vibration fatigue tests of several groups of cantilever beams with significant bi-modal re-sponse are proposed, then their fatigue lives are estimated with these frequency-domain analysis methods using test-ed strain data, and the test life results and estimated life results are compared to verify the accuracy and application range of the mentioned frequency-domain analysis methods.
- wide-band random vibration /
- fatigue life estimation /
- frequency domain analysis /
- vibration fatigue test

[1]	曹明红,葛森,齐丕骞.随机振动疲劳频域分析方法的对比研究[J].振动工程学报,2008,21(增刊)
[2]	NWM Bishop.Vibration Fatigue Analysis in the Finite Ele-ment Environment[R].XVI Encuentro del grupo espanol de fractura Torremolinos,Spain,April,1999:14～16
[3]	Chow C L,Li D L.An analytical solution for fast fatigue assess-ment under wide-band random loading[J].International Journal of Fatigue,1991,13(5):395～404
[4]	Benasciutti D,Tovo R.Comparion of spectral methods for fatigue analysis in broad-band gaussian random processes[J].Probabi-listic Engineering Mechanics,2004,21(4):287～299
[5]	Wirsching P H,Torng T Y.Advanced fatigue reliability analysis[J].International Journal of Fatigue,1991,13(5):389～394
[6]	Fu T T,Cebon D.Predicting fatigue lives for Bi-modal stress spectral densities[J].International Journal of Fatigue,2000,22:11～21
[7]	赵选民等编.数理统计[M].科学出版社,1999