RESEARCH ON NONLINEAR DAMPING CHARACTERISTICS OF DAMPING ALLOY WITH UNIFORM STRESS FIELD

机译：均匀应力场的阻尼合金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：对于阻尼合金等高阻尼金属材料，阻尼能力通常随应变幅度和频率非线性变化。首先，为了提取内部阻尼与应变的关系，本文提出了两种时域计算方法。一种是基于FFT（MEM + FFT）的移动指数方法（简称MEM），另一种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获得的。然后，为了提取内部阻尼相对于振动频率的模式，基于半功率带宽方法进行了正弦扫描频率激励实验。结果曲线表明内部阻尼也是频率的非线性函数。

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来源
《7th Biennial Conference on Engineering Systems Design and Analysis 2004(ESDA 2004) vol.1: Advanced Energy Systems; Advanced Heat Transfer in Engineering Systems; ...》|2004年|P.293-297|共5页
会议地点 Manchester(GB)
作者
Hongzhao Liu; Ziying Wu; Lilan Liu; Daning Yuan; Zhongming Zhang;
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Department of mechanical engineering, Xi'an University of Technology, Xi'an, China, Zip: 710048;

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原文格式 PDF
正文语种 eng
中图分类机械设计、计算与制图;
关键词
nonlinear damping; uniform stress field; sweep-frequency; the moving exponent method based on FFT;

机译：非线性阻尼；均匀应力场；扫频；基于FFT的移动指数法;

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机译：具有强阻尼和非线性边界记忆阻尼项的非线性粘弹性方程的存在与一致衰减。
2. On uniform decay of the solution for a damped nonlinear coupled system of wave equations with nonlinear boundary damping and memory term [J] . Bae JJ. Applied mathematics and computation . 2004,第1期

机译：具有非线性边界阻尼和记忆项的非线性波动方程组的解的一致衰减。
3. Non-parametric simultaneous identification of both the nonlinear damping and restoring characteristics of nonlinear systems whose dampings depend on velocity alone [J] . T.S. Jang Mechanical systems and signal processing . 2011,第4期

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4. RESEARCH ON NONLINEAR DAMPING CHARACTERISTICS OF DAMPING ALLOY WITH UNIFORM STRESS FIELD [C] . Hongzhao Liu, Ziying Wu, Lilan Liu, Biennial ASME Conference on Engineering Systems Design and Analysis . 2004

机译：均匀应力场阻尼合金的非线性阻尼特性研究
5. A study of damping characteristics of aluminum-indium alloys and melting transformation of embedded indium inclusions. [D] . Malhotra, Ashwani Kumar. 1993

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机译：均匀框架的振动特性使得沿着高度阻尼量的不均匀性：等效模态阻尼因子和阻尼能量

RESEARCH ON NONLINEAR DAMPING CHARACTERISTICS OF DAMPING ALLOY WITH UNIFORM STRESS FIELD

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