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DESIGN OPTIMIZATION OF MARINE ENGINE-MOUNT SYSTEM

โœ Scribed by J.S. TAO; G.R. LIU; K.Y. LAM

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
266 KB
Volume
235
Category
Article
ISSN
0022-460X

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โœฆ Synopsis

The engine is modelled as a rigid body with supports connected to a rigid #oor. The mounts are modelled as three-dimensional isolators with hysteresis damping. The objective is to select the sti!ness coe$cient and orientations of individual mount in order to minimize the vertical force transmitted from the engine to the #oor to control the structureborne noise. Constraints are imposed to keep the isolator static and dynamic de#ection within the desired limits and a minimum gap between system natural frequency and engine excitation frequency for avoiding possible system resonance. The sequential quadratic programming (SQP) technique has been applied as the optimization algorithm. The typical force and moment of a 4-stroke engine with one cylinder is analyzed and input in the optimization system. The results of optimization are compared with that of a conventional engineering design with the isolators working under their maximum allowable de#ection. This comparison shows that, as compared with force transmission of the conventional isolation system, the value of optimized system is only half for multi-frequencies excitation and one-fourth for single frequency excitation. The mechanism of vibration isolation involved in the optimization is investigated with the frequency response of the system. Sensitivity study of the system with the variation of the design parameters is also carried out and proves that the minimum obtained is the global value in the range of design parameters.

2000 Academic Press.

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