脉冲磁场激励下铁磁梁式板动力响应特征研究  

Analysis on dynamic characteristics for ferromagnetic beam-plate under the transverse pulse magnetic fields

作　　者：高原文[1] 缑新科[1] 周又和[1] 

机构地区：[1]兰州大学力学系,甘肃兰州730000

出　　处：《振动工程学报》2005年第3期314-317,共4页Journal of Vibration Engineering

基　　金：国家自然科学基金青年基金(10302009);兰州大学交叉学科青年基金(LZU200305);兰州大学博士资助计划(584407)

摘　　要：基于广义变分原理得到磁力计算模型和磁场摄动技术,研究了不可移简支铁磁梁式板在矩形和锯齿形两类典型脉冲磁场作用下的磁弹性动力响应特征及动力失稳现象。数值模拟了铁磁梁式板在稳恒磁场,脉冲磁场下的振幅,频率的变化及其动力失稳特征。揭示了脉冲磁场的形状,脉冲持续时间,脉冲幅值与铁磁梁式板振幅,频率,临界失稳磁场值等特征参量之间的关系,为工程实际中铁磁结构的安全设计和可靠性评估提供依据和参考。Based on the generalized variational principle of ferromagnetic bodies and the technique of magnetic field perturbation, this paper present an analysis on dynamic response and dynamic instability of the ferromagnetic beam-plate with unmovable simple supports under the two type pulse magnetic fields. The dynamic characteristics of ferromagnetic beam-plate, such as, amplitude of vibration, frequency of vibration, dynamic instability that varies with the applied magnetic field increasing are simulated by a numerical code. The effect of shapes, duration and peak value of pulse magnetic fields on some characteristic parameters, especially the critical pulse magnetic field of instability, amplitude and frequency of vibration which are directly related to the safety of structures operated in strong pulse magnetic fields are also given in this paper. All these results are very useful in the design and evaluation of safety and function of ferromagnetic structures.

关 键 词：非线性振动 动力失稳 铁磁梁式板 脉冲磁场 

分 类 号：O347.1[理学—固体力学] O343.9[理学—力学]