无轴承旋翼直升机气动机械稳定性分析

摘要

The model of aeromechanic stability for bearingless rotor helicopters is built up by employing modal synthesis technology.The analysis of ground and air resonance for bearingless rotor helicopters is carried out by taking a bearingless rotor mounted to a light helicopter as study objective, and the modal test data of airframe and rotor design data as an example.The influence of some factors on stability is studied and ways of increase damping from design as well as the investigation are discussed.The results show that mounting dampers on rotor and increasing their damping efficiency as well as designing the aeroelastic coupling of blade to the benefit of damping are key measures to eliminate ground and air resonance of bearingless rotor helicopter.%采用模态综合技术建立了旋翼与机体耦合气动机械稳定性分析模型,并以采用无轴承旋翼的轻型直升机为研究对象,依据机体动力学特性试验数据和旋翼设计数据,进行了地面共振和空中共振分析.研究了一些设计因数对稳定性的影响,讨论了从设计上增大阻尼的方法和在分析方法上还应注重的研究内容,研究结果表明,安装减摆器,并提高其阻尼效率,以及设计对阻尼有利的桨叶气弹耦合是消除无轴承旋翼地面共振和空中共振的重要设计措施.