离心锤变桨距机构设计与优化研究

Research on the Design and Optimization of Centrifugal Hammer Pitch-controlled System

针对现有高空飞艇螺旋桨推进系统中,采用变桨距技术重量代价大、能源消耗多的问题,设计一种基于离心力的离心锤变桨距机构,分析该机构的工作原理,并利用ADAMS软件进行机构运动学和动力学仿真分析;对离心锤进行参数化建模,建立约束方程后,以桨距优化角为目标函数,对离心锤的空间位置进行优化。结果表明:当外界条件引起螺旋桨转速变化时,该机构可以很好地实现螺旋桨变桨距功能;在现有平台上,48°的离心锤安装角具有最优的变距效果。

In a high altitude airship propeller system,at present,adopting the technology of variable pitch increases the weight and consumes more energy.A kind of centrifugal hammer pitch-controlled system is designed based on the centrifugal force,the working principle of the mechanism is analyzed,and kinematics and dynamics simulation analysis are carried out by using the ADAMS software.On the basis of the simulation results,parametric modeling of centrifugal hammer is applied,a constraint equation is establish and the pitch angle of optimization as the objective function is made to optimize the space position of the centrifugal hammer.The simulation results show that when the propeller speed changes,this system can accomplish the functions of variable pitch propeller,and verify the feasibility of the mechanism.The optimization results show that 48 degrees of centrifugal hammer installation angle has the best effect of variable pitch for this platforms.