摘要
用有限元法计算了双端面期末密封两端面的气膜刚度和阻尼,分析了密封跑道质量和主密封环质量对气膜刚度和阻尼的影响,并对瞬态扰动力作用下前密封跑道和主密封环的振动过程进行了讨论.结果表明:膜厚对气膜刚度和阻尼影响较大,在膜厚小于5μm下尤为明显;系统的自由振动频率主要由前密封跑道质量决定,主密封环质量对自由振动频率影响较小;同一密封跑道质量对应的不同环道质量比对系统振动的收敛时间影响不大.
Two stiffness and damping of the seal were calculated with the finite element method;the influence of the racetrack and the primary seal ring mass on the stiffness and damping was analyzed;then the vibration process of the seal caused by transient force was analyzed.The results declare that film thickness has a great influence on the stiffness and damping,especially when the thickness is less than 5 μm;free vibration frequency of the system is mainly decided by the mass of the seal racetrack,and the effect of the primary seal ring mass on free vibration frequency is neglected;the different ratio of the system mass with the same racetrack mass has a little influence on the convergent time of the vibrating system.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2010年第5期509-512,共4页
Journal of Beijing University of Aeronautics and Astronautics
关键词
气膜刚度
气膜阻尼
气膜密封
自由振动频率
gas film stiffness
gas film damping
gas film seal
free vibration frequency
