利用一种电磁型主控式干摩擦阻尼器(active magnetic dry friction damper,AMDFD)来改变支承的阻尼,以实现对航空发动机转子系统支承结构外传振动的有效控制。在传统的双转子系统动力学模型基础上,建立了能够表征支承外传振动的AMDFD-...利用一种电磁型主控式干摩擦阻尼器(active magnetic dry friction damper,AMDFD)来改变支承的阻尼,以实现对航空发动机转子系统支承结构外传振动的有效控制。在传统的双转子系统动力学模型基础上,建立了能够表征支承外传振动的AMDFD-双转子-轴承座动力学模型;采用转速区间开关控制器和无模型自适应控制器,对AMDFD抑制转子支承结构外传振动的有效性进行了仿真分析,并阐明了AMDFD抑制支承结构外传振动的内在机理。在搭建的AMDFD-双转子系统试验台上,进行了双转子系统加速通过多阶临界转速区时支承结构外传振动的主动控制试验。结果表明,利用转速区间的开关控制器和无模型自适应控制器,AMDFD能够有效地降低各支承位置在各阶临界转速区的外传振动,降低幅度均超过了52%。展开更多
A nonlinear model of anti-backlash gear with time-varying friction and mesh stiffness was proposed for the further study on dynamic characteristics of anti-backlash gear. In order to improve the model precision, appli...A nonlinear model of anti-backlash gear with time-varying friction and mesh stiffness was proposed for the further study on dynamic characteristics of anti-backlash gear. In order to improve the model precision, applied force analysis was completed in detail, and single or double tooth meshing states of two gear pairs at any timing were determined according to the meshing characteristic of anti-backlash gear. The influences of friction and variations of damping ratio on dynamic transmission error were analyzed finally by numerical calculation and the results show that anti-backlash gear can increase the composite mesh stiffness comparing with the mesh stiffness of the normal gear pair. At the pitch points where the frictions change their signs, additional impulsive effects are observed. The width of impulsive in the same value of center frequency is wider than that without friction, and the amplitude is lower. When gear pairs mesh in and out, damping can reduce the vibration and impact.展开更多
文摘利用一种电磁型主控式干摩擦阻尼器(active magnetic dry friction damper,AMDFD)来改变支承的阻尼,以实现对航空发动机转子系统支承结构外传振动的有效控制。在传统的双转子系统动力学模型基础上,建立了能够表征支承外传振动的AMDFD-双转子-轴承座动力学模型;采用转速区间开关控制器和无模型自适应控制器,对AMDFD抑制转子支承结构外传振动的有效性进行了仿真分析,并阐明了AMDFD抑制支承结构外传振动的内在机理。在搭建的AMDFD-双转子系统试验台上,进行了双转子系统加速通过多阶临界转速区时支承结构外传振动的主动控制试验。结果表明,利用转速区间的开关控制器和无模型自适应控制器,AMDFD能够有效地降低各支承位置在各阶临界转速区的外传振动,降低幅度均超过了52%。
基金Project(51175505)supported by the National Natural Science Foundation of China
文摘A nonlinear model of anti-backlash gear with time-varying friction and mesh stiffness was proposed for the further study on dynamic characteristics of anti-backlash gear. In order to improve the model precision, applied force analysis was completed in detail, and single or double tooth meshing states of two gear pairs at any timing were determined according to the meshing characteristic of anti-backlash gear. The influences of friction and variations of damping ratio on dynamic transmission error were analyzed finally by numerical calculation and the results show that anti-backlash gear can increase the composite mesh stiffness comparing with the mesh stiffness of the normal gear pair. At the pitch points where the frictions change their signs, additional impulsive effects are observed. The width of impulsive in the same value of center frequency is wider than that without friction, and the amplitude is lower. When gear pairs mesh in and out, damping can reduce the vibration and impact.
