期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 41, 期 1-2, 页码 380-395出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2013.07.002
关键词
Non-viscous damping; Maxwell element; Internal variables; Symmetric state-space formulation; System identification
资金
- Sapienza Universita di Roma
- H2CU (Honors Center of Italian Universities)
- H2CU
In this paper, a new methodology is proposed to identify modal and physical parameters of linear non-viscously damped multi-degree-of-freedom systems using recorded time-histories of their dynamic response. The methodology is based on the identification of a symmetric state-space realization of the system, whose modal parameters (spectral and modal matrices) are subsequently used to determine the physical parameters (mass, stiffness and damping matrices) of the model in second-order form. The state-space formulation, well known in the literature for systems with viscous damping, is extended to systems with non-viscous damping through the use of additional internal variables, devoted to represent the dependence of the dissipative forces on the past history of generalized velocities. The methodology is validated by means of numerical simulations aiming at assessing its accuracy and the errors possibly due to incomplete experimental data. Considering that the general non-viscous model is able to represent also the viscous damping behaviour as a special case of memmyless damping, applications are eventually provided to investigate the applicability of the proposed methodology to the identification of both proportional and non-proportional viscously damped systems. (C) 2013 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据