第10课 试验模态分析.ppt

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第10课 试验模态分析

Experimental Modal Analysis SDOF and MDOF Models Different Modal Analysis Techniques Exciting a Structure Measuring Data Correctly Modal Analysis Post Processing Simplest Form of Vibrating System Mass and Spring Mass, Spring and Damper Basic SDOF Model SDOF Models — Time and Frequency Domain Modal Matrix MDOF Model Why Bother with Modal Models? Definition of Frequency Response Function Benefits of Frequency Response Function Frequency Response Functions are properties of linear dynamic systems They are independent of the Excitation Function Excitation can be a Periodic, Random or Transient function of time The test result obtained with one type of excitation can be used for predicting the response of the system to any other type of excitation Different Forms of an FRF Alternative Estimators Which FRF Estimator Should You Use? Definitions: SDOF and MDOF Models Different Modal Analysis Techniques Exciting a Structure Measuring Data Correctly Modal Analysis Post Processing Three Types of Modal Analysis Hammer Testing Impact Hammer ’taps’...serial or parallel measurements Excites wide frequency range quickly Most commonly used technique Shaker Testing Modal Exciter ’shakes’ product...serial or parallel measurements Many types of excitation techniques Often used in more complex structures Operational Modal Analysis Uses natural excitation of structure...serial or parallel measurements ’Cutting’ edge technique Different Types of Modal Analysis (Pros) Hammer Testing Quick and easy Typically Inexpensive Can perform ‘poor man’ modal as well as ‘full’ modal Shaker Testing More repeatable than hammer testing Many types of input available Can be used for MIMO analysis Operational Modal Analysis No need for special boundary conditions Measure in-situ Use natural excitation Can perform other tests while taking OMA data Different Types of Modal Analysis (Cons) Hammer Testing Crest factors due impulsive measurement Input force can be different from measurement t

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