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首页> 外文会议>Biennial ASME Conference on Engineering Systems Design and Analysis >RESEARCH ON NONLINEAR DAMPING CHARACTERISTICS OF DAMPING ALLOY WITH UNIFORM STRESS FIELD
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RESEARCH ON NONLINEAR DAMPING CHARACTERISTICS OF DAMPING ALLOY WITH UNIFORM STRESS FIELD

机译：均匀应力场阻尼合金的非线性阻尼特性研究

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For the high damping metal material like damping alloy, the damping capacity usually changes with the strain amplitude and frequency nonlinearly. First, to extract the pattern of the internal damping versus strain, two time-domain calculation methods are presented in this paper. One is the moving exponent method (MEM for short) based on FFT (MEM+FFT) and the other is the moving autoregressive model method (MARM). The computing accuracy of the two methods has been compared through numerical simulations. The nonlinear relation curve of loss factor versus strain is achieved by the impulse excitation experiment employing uniform stress field. Then, to extract the pattern of the internal damping versus vibrating frequency, the sine sweep-frequency excitation experiment based on the half-power bandwidth method is carried out. The resulting curve indicates that the internal damping is also a nonlinear function of frequency.
机译：对于像阻尼合金的高阻尼金属材料，阻尼能力通常随着应变幅度和频率的非线性而变化。首先，为了提取内部阻尼与应变的图案，本文提出了两个时间域计算方法。一个是基于FFT（MEM + FFT）的移动指数方法（MEM短），另一个是移动自回归模型方法（MARM）。通过数值模拟比较了两种方法的计算精度。损耗因子与应变的非线性关系曲线是通过采用均匀应力场的脉冲激励实验来实现的。然后，为了提取内部阻尼与振动频率的图案，执行基于半功率带宽方法的正弦扫描频率激励实验。所得到的曲线表示内部阻尼也是频率的非线性函数。

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