摘要
直升机地面开车,若旋翼后退型摆振运动模态与桨毂中心有平移的机体在起落架上的刚体模态频率耦合,这种现象称为地面共振。除频率避开外,还可通过安装抑制旋翼摆振运动的桨叶阻尼器或用带缓冲支柱的起落架来提供抑制地面共振现象的阻尼。桨叶阻尼器常见的有液压阻尼器、黏弹阻尼器和液弹阻尼器3种。基于某直升机数据,文中计算其安装3种阻尼器后的地面共振特性,分析不同阻尼器对地面共振特性的影响。
When helicopters work on groud, if the regressive lag modal frequency is similar to the rigid body modal frequencies of body on undercarts at hub center, groud resonance is occurred. Except the frequency request, we can also use rotor damper or absorber to get enough damp to avoid resonance. Rotor damper usually contains hydraulic damper,viscoelastic damper, fluidlastic damper. This paper shows the influence on the ground resonance character with different kinds of rotor dampers based on the analysis results of a certain helicopter.
作者
周华
ZHOU Hua(Helicopter Research and Development Institute of AVIC,Jingdezhen333001,Chin)
出处
《机械工程师》
2018年第6期76-77,79,共3页
Mechanical Engineer
关键词
直升机
阻尼器
地面共振
液压
黏弹
液弹
helicopter
damper
ground-resonance
hydraulic
viscoelastic
fluidlastic
