| 双峰应力谱密度雨流幅值分布 |
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| 引用本文： | 王明珠,姚卫星.双峰应力谱密度雨流幅值分布[J].航空学报,2009,30(9):1666-1671. |
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| 作者姓名： | 王明珠 姚卫星 |
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| 作者单位： | 南京航空航天大学,飞行器先进设计技术国防重点学科实验室,江苏,南京,210016 |
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| 基金项目： | 国家自然科学基金(10702027) |
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| 摘 要： | 为了在频域内解决双峰应力谱密度下的结构疲劳寿命估算问题，提出了双峰应力谱的雨流幅值分布模型，并给出了参数估算方法。假设雨流幅值分布为两个双参数Weibull分布的组合，权重系数反映了两个谱密度峰值对雨流幅值分布的贡献；雨流幅值分布模型中的参数均是随机过程谱参数的函数。数值模拟结果表明：两个Weibull分布的组合能够很好地描述双峰应力谱的雨流幅值分布，模型中的参数能够根据双峰应力谱密度的谱参数计算得出。
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| 关 键 词： | 随机振动 雨流计数法 幅值分布 振动疲劳 数值模拟 双峰谱密度 |
Rainflow Amplitude Distribution of Bi-modal Stress Power Spectral Density |
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| Wang Mingzhu,Yao Weixing.Rainflow Amplitude Distribution of Bi-modal Stress Power Spectral Density[J].Acta Aeronautica et Astronautica Sinica,2009,30(9):1666-1671. |
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| Authors: | Wang Mingzhu Yao Weixing |
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| Institution: | Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicles;Nanjing University of Aeronautics and Astronautics;Nanjing 210016;China |
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| Abstract: | To solve the fatigue life prediction problem of structures under bi-modal stress power spectral density in the frequency domain,this article presents a model of rainflow amplitude distribution of bi-modal stress power spectral density and provides a method to estimate its parameters.The rainflow amplitude distribution is assumed to be the combination of two two-parameter Weibull distributions with their weight coefficient reflect-ing the different contributions of each Weibull distribution.Parameters of the... |
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| Keywords: | random vibration rainflow counting method amplitude distribution vibration fatigue numerical simulation bi-modal spectral density |
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