RESEARCH OF SQUEEZE FILE DAMPER BEARING FOR ENGINES OF AUTOMOBILES

1994 Fiscal Year Final Research Report Summary

• Project/Area Number: 05452141
• Research Category: Grant-in-Aid for General Scientific Research (B)
• Allocation Type: Single-year Grants
• Research Field: 設計工学・機械要素・トライボロジー
• Research Institution: THE UNIVERSITY OF TOKYO
• Principal Investigator: TANAKA Masato THE UNIVERSITY OF TOKYO.FACULTY OF ENGINEERING.PROFESSOR, 工学部, 教授 (10011131)
• Project Period (FY): 1993 – 1994
• Keywords: squeeze film damper / oil film force / fluid inertia / simulation / dynamic characteristic / high eccentricity

Research Abstract

1.The oil film reaction forces in squeeze film damper bearing was theoretically obtained for reciprocative loading normally found in crankshaft bearings of automobile engines. Based on the theory, a computer program was developed and coded to simulate the dynamic response of squeeze film damper bearing under the reciprocative loading. This simulation program enables to predict the behavior of a damper journal in the damper bearing installed in actual automobile engines.
2.A test rig was set up to measure the dynamic characteristics of squeeze film damper bearings under reciprocative loading, that is, the dynamic response of damper journal in the bearing and also the hydrodynamic pressure developed in the oil film. Measurements proved to be in good agreement with predictions.
3.The simulation program was modified to take into consideration the inertia effects of the oil film. The modified theory was in beter agreement with measurements at high reciprocative frequency of loading where the inertia effect was considered to be pronounced.