Abstract: In order to expand the narrow range that the main rotor speed varies in，based on an ideal Continuously Variable Transmission model，a method by comprehensive simulation and control of helicopter variable rotor speed with coupled engine and transmission was proposed. Improved comprehensive rotorcraft propulsion system model was composed of a simplified model of main rotor and a component-level model of turbo-shaft engine by blade element analysis and volume dynamics theory. Then a Continuously Variable Transmission model by energy method was appended to the system model，and the rotor speed could be shifted with a variable gear ratio. Finally，the influence on the state of the main rotor and engine in the process of a rotor speed shifting control was analyzed by the numerical simulation. The results show that the rotor speed could be continuously changed up to 25% with only 1.5% change of the power-turbine speed by the above programs，therefore a valuable verification platform is provided herein.

Key words: Helicopter；Turbo-shaft engine；Variable rotor speed；Continuously variable transmission；Comprehensive simulation

摘要： 为了扩大直升机变旋翼转速变化范围，开展了基于无级变速机构的直升机/传动系统/发动机连续变旋翼转速控制模拟方法研究。基于叶素法和容积动力学方法，建立了主旋翼/发动机综合数学模型用于直升机推进系统仿真，该模型由主旋翼简化模型和涡轴发动机部件级模型组成。在主旋翼/发动机综合模型的基础上，加入了基于能量法建立的无级变速传动装置动力学模型，通过变传动比实现变旋翼转速控制模拟，通过定常来流状态下的数字仿真，分析变旋翼转速控制过程对主旋翼和发动机状态的影响。结果表明，提出的变旋翼转速控制模拟方法在保证涡轴发动机动力涡轮转速变化小于1.5%的前提下使旋翼转速连续变化25%，建立的直升机/传动系统/发动机综合模型为变旋翼转速技术的设计与验证提供了较可靠的数字仿真平台。

关键词: 直升机；涡轴发动机；变旋翼转速；无级变速器；综合仿真