论文部分内容阅读
对直升机加装桅杆式瞄准具后 ,聚焦式隔振系统的特性进行了分析与试验研究。考虑旋转翼轴、桅杆支撑结构的弹性影响 ,提出了一个新的 5个自由度的桅杆 /隔振系统 /机身耦合模型。为了验证该模型并有利于桅杆式瞄准技术的进一步研究 ,加工了一套瞄准具假件及其支撑结构 ,并在直 -×型机上进行了频率和传递函数测试 ,计算结果与试验结果吻合。研究表明 ,加装 80 kg的瞄准具 (被隔振重量的 1 2 % ) ,聚焦式隔振系统的一阶频率下降了 3 9% ;结构弹性对隔振系统隔振效率有很大影响 ,即使是原型机也达到了 40 3 %。
After the helicopter is equipped with the mast sight, the characteristics of the focusing vibration isolation system are analyzed and tested. Considering the elastic influence of rotating wing shaft and mast supporting structure, a new mast / vibration isolation system / fuselage coupling model with 5 degrees of freedom is proposed. In order to validate the model and facilitate the further research on the mast-type aiming technology, a set of sighting artifacts and their supporting structures were fabricated. The frequency and transfer function tests were carried out on a straight-x-type machine. The calculated results are consistent with the experimental results. The research shows that the first order frequency of the focusing vibration isolation system drops by 39% with the installation of 80 kg sights (12% of the vibration isolation weight); the structural elasticity has a great influence on the vibration isolation efficiency of the vibration isolation system, Even the prototype reached 40.3%.