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基于经验模态分解和Duffing振子的轴承故障诊断（Fault Diagnosis of Bearing Based on EMD and Duffing Oscillator）
轴承 故障诊断 混沌振子 经验模态分解
2010/12/29
针对齿轮箱轴承振动信号故障信息容易被噪声淹没，且具有非线性、非平稳特性的问题，提出了基于经验模态分解（EMD）和Duffing振子的轴承故障诊断方法。首先对原始振动信号进行经验模态分解，找到包含轴承故障信息的固有模态函数（IMF），然后利用Duffing振子的分岔图找到混沌振子相轨迹发生变化的内部激励力分界值，并将Duffing 振子的内部激励力频率设定为轴承故障特征频率，最后从混沌振子输出相轨迹...
Coupled method of homotopy perturbation method and variational approach for solution to nonlinear cubic-quintic Duffing oscillator
Nonlinear Oscillators Variational formulation
2010/11/25
This paper presents a new approach for solving approximate analytical higher order solutions for strong nonlinear Duffing oscillators with cubic-quintic nonlinear restoring force. The system is conser...