首页> 外文会议>ASME international design engineering technical conferences and computers and information in engineering conference 2012 >NONLINEAR SYSTEM IDENTIFICATION OF A CANTILEVER BEAM WITH ATTACHED CUBIC NONLINEAR SPRING AT ITS FREE END
【24h】

NONLINEAR SYSTEM IDENTIFICATION OF A CANTILEVER BEAM WITH ATTACHED CUBIC NONLINEAR SPRING AT ITS FREE END

机译:自由端附加了立方非线性弹簧的悬臂梁的非线性系统识别

获取原文
获取原文并翻译 | 示例

摘要

This paper presents the identification of the local nonlinear effects on the essential dynamics of distributed parameter systems. The system considered is a simple cantilever beam with an attached cubic nonlinear spring at its tip. Nonlinear system identification (NSI) method applied in this work uses numerical simulation results and combines slow-fiow dynamic analysis and empirical mode decomposition (EMD) to reconstruct the dynamics in modal coordinates as reduced-order models. The reduced-order models are single-degree-of-freedom linear oscillators, which are termed intrinsic modal oscillators (IMOs), with a forcing computed through slow-flow analysis. These forced oscillators are capable of reproducing the modal dynamics, and their forcing amplitudes provide essential information about modal interactions and energy transfer. The proposed NSI method was applied to 3 main cases, corresponding to weakly nonlinear, strongly nonlinear and linear dynamics, respectively. A discrete model of the original system is used to investigate the internal resonances and nonlinearity effects in the original system, by making use of Frequency-Energy plots (FEPs).
机译:本文提出了对分布参数系统基本动力学的局部非线性效应的识别。所考虑的系统是一个简单的悬臂梁,在其顶端具有一个附加的立方非线性弹簧。这项工作中应用的非线性系统识别(NSI)方法使用数值模拟结果,并将慢流动态分析和经验模态分解(EMD)结合起来,将模态坐标中的动力学重构为降阶模型。降阶模型是单自由度线性振荡器,称为固有模式振荡器(IMO),其强迫通过慢流分析计算得出。这些强制振荡器能够再现模态动力学,并且它们的强迫振幅提供了有关模态相互作用和能量传递的基本信息。提出的NSI方法应用于3种主要情况,分别对应于弱非线性,强非线性和线性动力学。通过使用频率能量图(FEP),使用原始系统的离散模型来研究原始系统中的内部共振和非线性效应。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号