Linearized Models,Stability Criteria and Experimental Verification for Plenum Air Cushions with Compressor-Duct Interactions.

摘要

An analytical and experimental investigation of the static and dynamic behavior of nearly full scale pleunum-type air cushion suspensions is described,including the effects of compressor-duct dynamics and secondary suspension characteristics. The results indicate that cushion-duct interactions may strongly affect cushion stability unless the lowest resonant frequency of the duct is much higher than the cushion unsprung mass natural frequency. Criteria are suggested for selecting appropriate duct models for use in suspension dynamic analysis. For most practical systems a second-or at most fourth-order duct model will adequately represent the distributed duct dynamics. The report is the latest in a series of investigations whose goal is experimentally verified models,advanced concepts and design criteria for pressurized air cushions which will permit safe and comfortable operation of high speed tracked levitated vehicles over economically feasible guideways.