Theoretical_and_Experimental_Modal_Analysis

新德里理工大学的模态分析课件

Theoretical and Experimental Modal AnalysisTopics: Experimental and theoretical routes Introduction to model testing, vibration testing Models of vibrating structures Spatial model Modal model and Response model1

新德里理工大学的模态分析课件

IntroductionModal 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. o Modal analysis involves process of determining the modal parameters of a structure to construct a modal model of the responseTheoretical[ Finite Element Analysis (FEA)] and Experimental Modal Analysis (EMA) have been very separate engineering activities aimed at solving above mentioned common problem. Now the two technologies are converging and powerful new tools for solving noise and vibration problems are emerging as a result.

新德里理工大学的模态分析课件

Experimental and theoretical routes

新德里理工大学的模态分析课件

Experimental and theoretical routes The modal parameters may be determined by analytical means, such as finite element analysis, and one of the common reasons for experimental modal analysis is the verification/correction of the results of the analytical approach (model updating). 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.4

新德里理工大学的模态分析课件

Theoretical and Experimental Modal AnalysisTopics: Experimental and theoretical routes Introduction to model testing, vibration testing Models of vibrating structures Spatial model Modal model and Response model5

新德里理工大学的模态分析课件

Introduction to Modal Testing

新德里理工大学的模态分析课件

Introduction to Modal Testing

新德里理工大学的模态分析课件

Introduction to Modal Testing

新德里理工大学的模态分析课件

Introduction to Modal Testing

新德里理工大学的模态分析课件

Introduction to Modal Testing

新德里理工大学的模态分析课件

Introduction to Modal Testing

新德里理工大学的模态分析课件

Modal Testing ( Linearity Assumption )

新德里理工大学的模态分析课件

Modal Testing

新德里理工大学的模态分析课件

Anatomy of FFT analyzer

新德里理工大学的模态分析课件

Modal Testing

新德里理工大学的模态分析课件

Curve Fitting MethodsCURVE FITTING METHODS All curve fitting methods fall into one of the following categories,o o o o Local SDOF Local MDOF Global Multi-Reference (Poly Reference)

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.16