基于挤压油膜阻尼器(squeeze film damper,SFD)动力学特性系数识别试验台研究了油槽深度、供油压力以及供油孔数对活塞环端封SFD泄漏量和阻尼性能的影响.试验结果表明:带油槽结构的SFD滑油泄漏量是无油槽结构的2～7倍,油槽深度增加会增大泄漏量;低油压下阻尼系数的试验结果与短轴承理论解较接近,高油压下阻尼系数的试验结果在短轴承与长轴承理论解之间;对比无油槽结果,带油槽时阻尼性能有所下降,但是0.1 MPa以内两者阻尼系数接近;油槽较浅(深度为5倍油膜半径间隙,5c)时,低油压单孔供油与高油压多孔供油平均阻尼系数均能达到4.0×104～5.0×104N·s/m;油槽较深(深度为15c)时低油压单孔供油平均阻尼系数较大,可达到8.06×104N·s/m.低油压单孔供油时引入油槽结构显著提高SFD阻尼系数,其可用于提高低供油压下SFD的减振性能.
Experiment on dynamic characteristics of squeeze film damper with different groove
The effects of groove depth,oil supply pressure,and the number of oil supply holes on leakage and damping performance of SFD with piston ring end-seals were discussed based on the SFD dynamic coefficients identification experimental device.The experiment results showed that the leakage with the groove was 2-7 times that without the groove of SFD.The test results of the damping coefficient under low oil supply pressure were close to the theoretical solution of short bearing,and the test results under high oil supply pressure were between the theoretical solutions of short bearing and long bearing.Compared with the results of SFD without a groove,the damping performance could decrease with the groove structure,but the damping coefficients were close to each other when the oil supply pressure was less than 0.1 MPa.When the groove was shallow(the depth was 5 times the clearance of oil film radius,5c),the average damping coefficient of single hole & low oil pressure and multiple hole & high oil pressure all can attain 4.0×104-5.0×104 N·s/m,yet when the groove was deep(the depth is 5c),the average damping coefficient of single hole & low oil pressure was large,up to 8.06×104 N·s/m.As a result,the introduction of a groove can significantly improve the damping coefficients of SFD,which can be used to improve the damping performance of SFD under low oil supply pressure.
squeeze film dampergroovedamping coefficientleakageshake test
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