The damping coefficient c is calculated as 2 sqrtkm 00

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Unformatted text preview: SAS IP, Inc. VM74: Transient Response to an Impulsive Excitation Overview Reference: W. T. Thomson, Vibration Theory and Applications, 2nd Printing, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1965, pg. 99, article 4.1. Analysis Type(s): Reduced Transient Dynamic Analysis (ANTYPE = 4) Element Type(s): Combination Elements (COMBIN40) Input Listing: vm74.dat Test Case A mass supported on a spring is subjected to an impulse force F(t) and thereafter undergoes free vibration. Determine the maximum deflection ymax of the mass for the undamped case and the deflection y at time t for two damping ratios: • ξ = 0.0 (undamped) • ξ = 0.7. Figure 74.1 Impulsive Excitation Problem Sketch Material Properties m = 0.5 lb-sec2/in k = 200 lb/in Loading (see time history in Figure 74.1: “Impulsive Excitation Problem Sketch”) Analysis Assumptions and Modeling Notes The node locations are arbitrarily selected. The damping coefficient c is calculated as 2ξsqrt(km) = 0.0 and 14.0 lb-sec/in for ξ = 0.0 and...
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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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