端封开口角度对挤压油膜阻尼器影响试验

The influences of different numbers of oil supply holes，supply pressure and piston ring gap angle on leakage were considered by orthogonal excitation method，and the damping coefficients of squeeze film damper (SFD) were identified. The results showed that the maximum leakage occurred when single oil supply hole existed and the piston ring gap coincided with the oil supply hole; under multiple influences of the number of oil supply holes，supply pressure and piston ring gap angle，the difference between the principal damping coefficients C_xx and C_yy was minimum when the piston ring gap angle with low oil pressure and single oil supply hole was 0°; the damping performance of SFD was excellent when the piston ring gap angle was 0° and the lowest single oil supply hole existed，and the average principal damping coefficient amounted to 9.04×10⁴ N·s/m，which was about 5.7 times of the maximum value of theoretical short bearing solution. It is recommended that the two piston ring gap angles should be all 0° during installation to ensure well sealing performance and improve the performance of SFD during operation.