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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 1.0200 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
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.
- Spring '09
- The Land