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Abstract

Analyists can use either analog or digital techni ques to simulate complex mechanical systems. To compare these techniques, we simulated a rotor system containing a transverse crack and supported on hydro dynamic bearings. The analog simulation involved an AD 256 analog computer, while the digital simulation was based on the DARE-P package and was run on a CDC 7600. We compared the simulation techniques with respect to the complexity they could handle, their accuracy, and the cost and time they required. Both computer programs are briefly described. We modeled the rotor-bearing system with four degrees of freedom, taking into consideration the flexibil ity, damping, and cross-coupling of the hydrodynamic bearings.

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References

Gasch, R.

Dynamic Behaviour of a Simple Rotor with a Cross-Sectional Crack

Presented at Conference on Vibrations in Rotating Machinery Paper C178/76 Institution of Mechnical Engineers

London September 1976

Henry, T.A. Okah-Avae, B.E.

Vibrations in Cracked Shafts

Presented at Conference on Vibrations in Rotating Machinery Paper C162/76 Institution of Mechanical Engineers

London September 1976

Mbonu, J.O. Cracked Shafts--a Digital Simulation Study Unpublished PhD transfer report University of Manchester Manchester , England 1979

Okah-Avae, B.E.

Analogue Computer Simulation of a Rotor System Containing a Transverse Crack

Simulation vol. 31 no. 6 December 1978 p. 193

Okah-Avae, B.E. The Vibrations of a Cracked Rotating Shaft Unpublished PhD thesis University of Manchester Manchester, England May 1977

10.

Comparing analog and digital simulation of a complex mechanical system

Abstract

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References