全尺寸旋翼智能变距拉杆设计及验证技术

Design and Verification of helicopter Rotor with Full-sized Smart Pitch Rod Technology

为降低直升机旋翼不平衡引起的振动,近几年出现了一种直升机旋翼实时调整(in-flight tuning, IFT)系统,通过主动式动态调整变距拉杆长度恢复旋翼系统动平衡状态,以达到减振目的;智能变距拉杆(smart pitch rod, SPR)是IFT系统的执行机构和重要的组成部件,其特点是精度高,载荷大;针对国内首次研究和试制的智能变距拉杆,提出了一种可行的设计方案,经加载台测试验证结果表明其最大推力达到了25 000 N,控制精度达到了0.01 mm以上;在某10吨级直升机旋翼塔上进行的旋翼平衡实时调整试验结果显示,1/rev旋翼振动减少了80%以上。

In order to reduce the vibration caused by the unbalance of helicopter rotor, an in-flight-tuning(IFT) system has been developed in recent years. the length of the pitch link is dynamically adjusted to restore the dynamic balance state of rotor system, which achieves the purpose of shock reduction. Smart pitch rod(SPR) is the actuator and important component of IFT system. SPR has the characteristics of high precision and large load. Aimed at the SPR for domestic research and trial production, a feasible design project is proposed, and the results of the loading platform show that the maximum thrust is 25 000 N,and the control accuracy of 0.01 mm. A real-time rotor balance adjustment test is carried out on a helicopter rotor tower with the load of 10 tons, the results show that the vibration of rotor can be reduced by above 80% under the condition of 1 rev/s.