2 00 undamped figure 711 spring mass damper system

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Unformatted text preview: er is shown for 3 points, based on an input of ui = A cos ωt, where ui is the excitation at the support (node 1). Show that the vibrometer response ∆ is 2% in error when operated at frequency ω. Figure 69.1 Seismic Response Problem Sketch Material Properties m = 1 lb-sec2/in k = 9.8696 lb/in Loading ω = 22.43537 rad/sec A = 1 in ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–158 VM69 Analysis Assumptions and Modeling Notes The node locations are arbitrarily selected. The spring is arbitrarily assumed to vibrate in the X direction. One master degree of freedom (MDOF) is selected at the mass in the vibration direction. Results Comparison Target ANSYS Ratio f, Hz 0.5000 0.5000 1.000 Ae, in[1] 1.0200 1.0200 1.000 1. Ae = expanded mode shape amplitude. Vibrometer accuracy is equal to 100 x (Ae - A)/A = 2% ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–159 VM70: Seismic Response of a Beam Structure Overview Reference: J. M. Biggs, Introduction to Structural Dynamics, McGra...
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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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