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Unformatted text preview: he elastic contact effect but low enough to also allow a practical integration time step
size. The integration time step (0.0005 sec) is based on < 1/30 of the period of the contact spring to minimize
the numerical damping effect, and to allow the acceleration change to be followed reasonably well.
Automatic time stepping is used to reduce the total number of iterations needed to solve the problem. A static
solution is done at the first load step to produce the initial pan condition before the start of the transient analysis.
The maximum time of 0.7 sec allows the pan to reach its largest deflection.
To model the "plastic impact" a damper (C2) is used which has the value of critical damping to prevent oscillation
of the contact spring. Also, the two masses are locked together after initial contact by use of KEYOPT(1) = 1 on
combination element type 1 (COMBIN40). Natural frequency of the closed gap is f2 = sqrt(k2mp)/(2 π) = 62.54 Hz.
Critical damping is calculated as C2 = k2...
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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