31 Dynamics_prestress[1]

31 Dynamics_prestress[1] - – Loading Apply the loads...

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Prestressed Modal Analysis What is prestressed modal analysis and why? Modal analysis of a prestressed structure. Some structures show different dynamic behavior depending on their stress state. A guitar string or a drum head, for example, will vibrate at higher frequencies as its tension is increased. When a turbine blade spins, its natural frequencies tend to be higher because of the prestress caused by centrifugal forces. To properly design such structures, both stress-free and prestressed modal analyses may be required. Three main steps: Build the model Prestress the model with a static analysis Do the modal analysis with prestress Build the Model: Same considerations as a normal modal analysis. Remember to specify density with proper units. Prestressed Modal Analysis Procedure
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9 Build the model Prestress the model with a static analysis Be sure to activate prestress effects.
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Unformatted text preview: – Loading: Apply the loads causing the prestress. – Postprocessing: Review the results to make sure that the proper loads have been applied. Prestressed Modal Analysis … Procedure Solution > Unabridged Menu Solution > Analysis Type > Analysis Options Prestressed Modal Analysis … Procedure Element Plot - Static Analysis of Prestressed Modal Stress Plot - Static Analysis of Prestressed Modal 9 Build the model 9 Pre-stress the model with a static analysis • Do the modal analysis with prestress – Same procedure as a normal modal analysis except that prestress effects must be included when specifying analysis options. Prestressed Modal Analysis … Procedure Prestressed plate Without prestress Compare: Prestressed Modal Analysis … Procedure 9 Build the model 9 Prestress the model with a static analysis 9 Do the modal analysis with Pre-stress Prestressed Modal Analysis … Procedure...
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This note was uploaded on 01/20/2010 for the course ME master taught by Professor Mon during the Spring '09 term at Hanyang University.

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31 Dynamics_prestress[1] - – Loading Apply the loads...

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