Results comparison target vy r 15 1111 ansys 1111

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Unformatted text preview: Overview Reference: W. T. Thomson, Vibration Theory and Applications, 2nd Printing, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1965, pg. 6, ex. 1.2-2. Analysis Type(s): Mode-frequency Analysis (ANTYPE = 2) Element Type(s): Spring-Damper Element (COMBIN14) Structural Mass Element (MASS21) Input Listing: vm45.dat Test Case An instrument of weight W is set on a rubber mount system having a stiffness k. Determine its natural frequency of vibration f. Figure 45.1 Spring-mass System Problem Sketch Material Properties k = 48 lb/in W = 2.5 lb Loading g = 386 in/sec2 Analysis Assumptions and Modeling Notes The spring length is arbitrarily selected. One master degree of freedom is chosen at the mass in the spring length direction. The weight of the lumped mass element is divided by gravity in order to obtain the mass. Mass = W/g = 2.5/386 = .006477 lb-sec2/in. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–107 VM45 Results Comparison Target f, Hz 1–108 ANSYS Rati...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

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