Theoretical and experimental modal analysis pdf

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theoretical and experimental modal analysis pdf

Theoretical and Experimental Modal Analysis | Analysis | Applied Mathematics

Journals by Subject. Journals by Title. Author s P. Zhang 3 , C. Lim 1,2. ABSTRACT The aim of this paper is to conduct experimental modal analysis and numerical simulation to verify the structural characteristics of a deployable-retractable wing for aircraft and spacecraft. A modal impact test was conducted in order to determine the free vibration characteristics.
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Modal Analysis - I

Theoretical and Experimental Modal Analysis

Nonlinearity, Bifurcation and Chaos - Theory and Applications. During the mechanical design and development of technical systems for power plants, in civil engineering, aerospace or mechanical engineering increasing demands are made concerning the performance, weight reduction and utilization of the material. The consequence is that the dynamical behaviour and the occurrence of vibrations of the load carrying parts, the so-called primary structures are becoming more and more important. It has to be avoided that undesired vibrations can disturb or even jeopardize the intended operation. Thus, the analysis of the dynamics and vibrations of structures is an important task.

Topics: Experimental and theoretical routes Introduction to model testing, vibration testing Models of vibrating structures Spatial model Modal model and Response model 1. Introduction Modal analysis is a method to describe a structure in terms of its natural characteristics which are the frequency, damping and mode shapes its dynamic properties. Often, though, an analytical model does not exist and the modal parameters determined experimentally serve as the model for future evaluations such as structural modifications. Predominately, experimental modal analysis is used to explain a dynamics problem, vibration or acoustic, that is not obvious from intuition, analytical models, or previous similar experience. Theoretical and Experimental Modal Analysis Topics: Experimental and theoretical routes Introduction to model testing, vibration testing Models of vibrating structures Spatial model Modal model and Response model 5. SDOF methods estimate modal parameters one mode at a time. MDOF, Global, and Multi-Reference methods can simultaneously estimate modal parameters for two or more modes at a time.

oretical modal analysis, TMA) or from experimental data (inverse approach or experi- . Figure 1: Theoretical and experimental nonlinear modal analysis.
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1. Introduction

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There is given the theoretical background of the modal analysis in this paper. In the first part modal analysis, its theoretical and experimental procedure of vibration analysis is defined. In document one degree of freedom system and its behavior, equations and next modification as system of free vibration, harmonic excitation, structural damping is defined. Also, there is defined important property of the modal model - orthogonal property. In the next step is discussed multi degrees of freedom system, its properties, damping and solution. Keywords: modal analysis, vibration, damping, orthogonal properties, excitation.

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