镁合金变化阻尼特性及其动力学分析方法

徐文涛; 张琰辉; 唐光武; 潘根基

doi:10.21656/1000-0887.410144

镁合金变化阻尼特性及其动力学分析方法

doi: 10.21656/1000-0887.410144

¹郑州大学力学与安全工程学院, 郑州 450001;²招商局重庆交通科研设计院有限公司桥梁工程结构动力学国家重点实验室, 重庆 400067

基金项目: 河南省科技发展计划基金（182102210178）

详细信息

作者简介:
徐文涛（1980—），男，满族，副教授，博士，硕士生导师(E-mail: xuwt@zzu.edu.cn);唐光武（1963—），男，研究员，硕士(通讯作者. E-mail: tangguangwu@cmhk.com).

中图分类号: TU973^+.23; V252.2
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出版历程
- 收稿日期: 2020-05-19
- 修回日期: 2020-06-01
- 刊出日期: 2020-12-01

Variable Damping Characteristics and a Dynamic Analysis Method for Magnesium Alloy

¹School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, P.R.China;²State Key Laboratory of Bridge Engineering Structural Dynamics, China Merchants Chongqing Communications Technology Research & Design Institute Co., Ltd., Chongqing 400067, P.R.China

摘要

摘要: 基于黏弹性阻尼机理，采用热动态机械分析仪（DMA）系统研究了GW63K型高强镁合金的阻尼特性.从动力学应用的角度给出了该型镁合金阻尼的大小、变化规律、影响因素等特征.首次明确了该型镁合金的阻尼参数在动力学分析中应作为变化量来定性描述，并定量地给出了阻尼随服役环境温度、激励频率变化的规律.对动力学系统中考虑变化阻尼而引起的非线性求解问题，建立了阻尼与时间的依赖关系.基于虚拟激励方法构造平稳问题的拟非平稳随机分析方法，提出了考虑镁合金变化阻尼的随机振动高效数值分析方法.分别对镁合金构件的结构动力学响应进行了数值模拟和实验研究以及对比分析验证.结果表明，基于恒定阻尼与变化阻尼的分析结果差异明显，而基于变化阻尼的动力学模型跟实验结果吻合更好.得出了在对精度要求较高的领域，应当采用变化阻尼模型对镁合金材料结构进行动力学分析的结论.
- 虚拟激励法 /
- 镁合金材料 /
- 阻尼特性 /
- 动态热机械分析仪 /
- 随机振动
Abstract: The damping characteristics of the GW63K magnesium alloy were studied by means of the dynamic thermomechanical analyzer (DMA) based on the viscoelastic damping theory. The magnitude, variation characteristics and dependence sensitivity of this magnesium alloy's damping were given from the angle of dynamic applications. For the first time the damping parameters of this type of magnesium alloy could be qualitatively described as variables in the dynamic analysis, and the damping change laws with the service environment temperature and excitation frequency were quantitatively given. For the nonlinear solution problem with variable damping in the dynamic system, the time-dependent manner of damping was established. Based on the pseudo excitation method, a quasi-non-stationary stochastic analysis method was built for stationary problems, and an efficient numerical analysis method for variable-damping problems of magnesium alloys under random vibration was proposed. Numerical and experimental verifications of the structural dynamic responses of magnesium alloy components were carried out respectively, to reveal the obvious difference between the analysis results based on constant damping and variable damping. The dynamic model based on variable damping gives results in better agreement with the experimental results. It is concluded that in the fields where high accuracy is required, the variable-damping model should be chosen to analyze the magnesium alloy material structure.
- pseudo excitation method /
- magnesium alloy material /
- damping characteristic /
- dynamic thermomechanical analyzer /
- random vibration

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参考文献(23)

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镁合金变化阻尼特性及其动力学分析方法

doi: 10.21656/1000-0887.410144

作者简介:
徐文涛（1980—），男，满族，副教授，博士，硕士生导师(E-mail: xuwt@zzu.edu.cn);唐光武（1963—），男，研究员，硕士(通讯作者. E-mail: tangguangwu@cmhk.com).

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Variable Damping Characteristics and a Dynamic Analysis Method for Magnesium Alloy

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留言板

镁合金变化阻尼特性及其动力学分析方法

doi: 10.21656/1000-0887.410144

作者简介: 徐文涛（1980—），男，满族，副教授，博士，硕士生导师(E-mail: xuwt@zzu.edu.cn);唐光武（1963—），男，研究员，硕士(通讯作者. E-mail: tangguangwu@cmhk.com).

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出版历程

Variable Damping Characteristics and a Dynamic Analysis Method for Magnesium Alloy

计量

出版历程

目录

作者简介:
徐文涛（1980—），男，满族，副教授，博士，硕士生导师(E-mail: xuwt@zzu.edu.cn);唐光武（1963—），男，研究员，硕士(通讯作者. E-mail: tangguangwu@cmhk.com).