Limit cycles and acoustic radiation analysis of a self-excited vibration system
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- 英文论文题名：Limit cycles and acoustic radiation analysis of a self-excited vibration system
- 论文作者：周奇郑 ; 王德石
- 英文论文作者：Zhou Qizheng ; Wang Deshi ; Naval University of Engineering
- 年：2016
- 作者机构：Naval University of Engineering;
- 英文论文关键词：self-excited vibration ; acoustic radiation ; vibro-acoustic coupling ; limit cycle ; IHB method
- 会议召开时间：2016-05-06
- 会议录名称：第十届动力学与控制学术会议摘要集
- 语种：英文
- 分类号：O323
- 学会代码：AGLU
- 会议名称：第十届动力学与控制学术会议
- 会议地点：中国四川成都
- 主办单位：中国力学学会动力学与控制专业委员会
- 学会名称：中国力学学会
- 页数：2
- 文件大小：760k
- 原文格式：D
- 会议级别：全国
摘要
The approximate analytical solution of the limit cycle and the acoustic radiation characteristics of a nonlinear vibro-acoustic coupling system consisting of a self-excited vibration system are investigated. The nonlinear coupling equations of the vibro-acoustic coupling system under external excitation are derived using variational theory. The modal expression method and the incoherent superposition assumption are employed to discretize the displacements and the surface acoustic pressure of the plate, and then the incremental harmonic balance(IHB) method is used to drive the approximate analytical expressions for the limit cycles of the coupling system. The acoustic radiation power level and the surface average velocity under multi-frequency excitation are defined to describe the response of the plate. The results are that there are limit cycle motions in the vibration of the vibro-acoustic coupling system due to the system's selfexcited vibration, and there are more harmonic components in the system when the parameters are increased. The vibro-acoustic characteristics of the plate present nonlinear variation because of the oscillator's nonlinear damping force. The method combining the IHB method and the modal expression method can be used to investigate the nonlinear vibro-acoustic coupling characteristics of a structure under external and self-excited excitation.
The approximate analytical solution of the limit cycle and the acoustic radiation characteristics of a nonlinear vibro-acoustic coupling system consisting of a self-excited vibration system are investigated. The nonlinear coupling equations of the vibro-acoustic coupling system under external excitation are derived using variational theory. The modal expression method and the incoherent superposition assumption are employed to discretize the displacements and the surface acoustic pressure of the plate, and then the incremental harmonic balance(IHB) method is used to drive the approximate analytical expressions for the limit cycles of the coupling system. The acoustic radiation power level and the surface average velocity under multi-frequency excitation are defined to describe the response of the plate. The results are that there are limit cycle motions in the vibration of the vibro-acoustic coupling system due to the system's selfexcited vibration, and there are more harmonic components in the system when the parameters are increased. The vibro-acoustic characteristics of the plate present nonlinear variation because of the oscillator's nonlinear damping force. The method combining the IHB method and the modal expression method can be used to investigate the nonlinear vibro-acoustic coupling characteristics of a structure under external and self-excited excitation.
The approximate analytical solution of the limit cycle and the acoustic radiation characteristics of a nonlinear vibro-acoustic coupling system consisting of a self-excited vibration system are investigated. The nonlinear coupling equations of the vibro-acoustic coupling system under external excitation are derived using variational theory. The modal expression method and the incoherent superposition assumption are employed to discretize the displacements and the surface acoustic pressure of the plate, and then the incremental harmonic balance(IHB) method is used to drive the approximate analytical expressions for the limit cycles of the coupling system. The acoustic radiation power level and the surface average velocity under multi-frequency excitation are defined to describe the response of the plate. The results are that there are limit cycle motions in the vibration of the vibro-acoustic coupling system due to the system's selfexcited vibration, and there are more harmonic components in the system when the parameters are increased. The vibro-acoustic characteristics of the plate present nonlinear variation because of the oscillator's nonlinear damping force. The method combining the IHB method and the modal expression method can be used to investigate the nonlinear vibro-acoustic coupling characteristics of a structure under external and self-excited excitation.
引文