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Prestress Modal Analysis Problem
This chapter contains a prestress modal problem. In a prestress modal analysis, Creo Simulate calculates the natural frequencies and mode shapes of your model. Creo Simulate also automatically calculates all predefined measures. This list of measures differs based on the analysis type.
mvsp001: Prestress Modal Analysis of a Stretched Circular Membrane
 Analysis Type: Prestress Modal Model Type: 3D Comparison: ANSYS Reference: Timoshenko, S., and Young, D.H. Vibration Problems in Engineering, 3rd Edition. D. Van Nostrand Co., Inc., New York, 1955. Description: Determine the first three radially symmetric, out of plane, natural frequencies of a circular membrane. Use stiffness calculated from static analysis where membrane is loaded radially. Edges are simply supported.
Specifications
 Element Type: plate Units: IPS Dimensions: radius: 15thickness: 0.01 Material Properties: Mass Density: 0.00073Cost Per Unit Mass: 0Young's Modulus: 3e7 Poisson's Ratio: 0.3Thermal Expansion: 0Conductivity: 0 Constraints: edge simply supported Loads: radial load of 100 lb/in
Comparison of Results Data
 Theory ANSYS % Difference Structure % Difference Mode 1 94.406 94.471 0.07% 94.442 0.03% Mode 6 216.77 217.38 0.28% 216.99 0.101% Mode 15 339.85 342.98 0.92% 341.11 0.37% Convergence %: 1 % on Frequency Max P: 8 No. Equations: 994
 Results are only for radially symmetric modesâ€”modes 1, 6, and 15 of the solution. These are out-of-plane modes, in other words; they appear in the profile view.