Adaptive descent 130 137 162 193 1433 1251 1252 1254

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Unformatted text preview: 001 1.000 Peak Time for Mass Ux 0.2560 0.2559 1.000 Target ANSYS Ratio Maximum Vx of Mass 1.5000 1.5001 1.000 Peak Time for Mass Vx 0.2560 0.2559 1.000 Table E3.2 Case 2: Ramp Input ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 3–7 VME4: Undamped Vibration Absorber Overview Reference: L. Meirovitch, Elements of Vibration Analysis, 2nd Edition, McGraw-Hill Book College Division, 1986, pp. 131-134. Analysis Type(s): Explicit Dynamics with ANSYS LS-DYNA Element Type(s): Explicit Spring-Damper Elements (COMBI165) Explicit 3-D Structural Mass Elements (MASS166) Input Listing: vme4.dat Test Case A sinusoidal force is applied to the main mass, M1 of the undamped system with a dynamic vibration absorber. The response of the main mass is zero for the case of a tuned main system / absorber system at steady-state. The absorber system consists of a spring, K2 and an absorber mass, M2. Material Properties Main Mass M1 = 5 k g Main Spring K1 = 10 N/m Absorber Mass M2 = 1 k g Absorber Spring K2 = 10 N/m Geometric Properties Spring Length of Springs = 1 m Loading Force of Main Mass = 1.0 sin(10t) (Entered as discrete values in an array.) Initial Absorber Mass Velocity = -0.1 m/s Analysis Assumptions and Modeling Notes As outlined in L. Meirovitch, Elements of Vibration Analysis, if a sinusoidal force, of the form f(t)=Fo sin(ωt), acts on the main mass of a system with a vibration absorber, and if the forcing frequency equals the n...
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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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