31 Dynamics_prestress[1]

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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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