摘要
阐述了重心不同对直升机的影响,通过对某型直升机的飞行试验数据进行分析研究,得出直升机在稳定平飞时旋翼基频的振动特性,进而研究直升机的振动响应随重心的变化规律。研究表明,直升机不同方向的振动响应受重心位置变化的影响不同,侧向振动响应随重心的变化主要受旋翼拉力变化的影响,垂向振动响应随重心的变化受旋翼桨叶在旋转过程中产生的升力不平衡影响较大。研究结果对直升机的重心包线设计具有参考价值,同时对后续直升机的振动试飞中振动测量位置的选择和试飞构型、状态的安排均有重要的指导意义。
The influence of center of gravity on the helicopter was expounded, through the analysis and research on the flight test datas of a certain type of helicopter, the vibration characteristics of the helicopter rotor＇ s fundamental frequency in the steady level flight were obtained, and the variation law of the helicopter vibration response with the center of gravity was analyzed. The research shown that the change of center of gravity had different influence on vibration response in different directions of helicopter. The variation of lateral vibration response with the center of gravity was mainly influenced by the change of rotor force, the change of the vertical vibration response with the center of gravity was greatly influenced by the unbalanced lift force generated during the rotation of the rotor blade. The research results have reference value to the envelope design of the helicopter＇ s center of gravity, it also has important guiding significance to select the vibration measuring position and the arrangement of flight test configuration and states in the vibration flight test of subsequent helicopter.
作者
周长悦
秦浩
董明明
ZHOU Changyue QIN Hao DONG Mingming(Chinese Flight Test Establishment, Xi＇an 710089, China)
出处
《航空科学技术》
2017年第1期36-41,共6页
Aeronautical Science & Technology
关键词
直升机
重心
振动响应
飞行试验
垂向振动
侧向振动
helicopter
center of gravity
vibration response
flight test
vertical vibration
lateral vibration
