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Unformatted text preview: wood Cliffs, NJ, 1965, pg. 178, ex. 6.6-1. Analysis Type(s): Reduced Harmonic Response Analysis (ANTYPE = 3) Element Type(s): Spring-Damper Elements (COMBIN14) Structural Mass Elements (MASS21) Input Listing: vm90.dat Test Case Determine the response amplitude (Xi) and phase angle (Φi) for each mass (mi) of the system in Figure 90.1: “Twomass-spring System Problem Sketch” when excited by a harmonic force (F1sin ωt) acting on mass m1. Figure 90.1 Two-mass-spring System Problem Sketch Material Properties m1 = m2 = 0.5 lb-sec2/in k1 = k2 = kc = 200 lb/in Loading F1 = 200 lb ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–204 VM90 Analysis Assumptions and Modeling Notes The spring lengths are arbitrarily selected and are used only to define the spring direction. Two master degrees of freedom (MDOF) are selected at the masses in the spring direction. A frequency range from zero to 7.5 Hz with a solution at 7.5/30 = 0.25 Hz intervals is chosen to give an adequate r...
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