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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。
In order to expand the scope of helicopter variable rotor speed variation, a simulation research on helicopter / transmission system / engine continuous variable rotor speed control based on CVT was carried out. Based on the method of vorticity and volumetric dynamics, a mathematical model of the main rotor / engine is built for the simulation of helicopter propulsion system. The model consists of a simplified model of the main rotor and a component-level model of the turbine shaft. Based on the main rotor / engine integrated model, the kinetic model of continuously variable transmission established based on energy method is added, and the variable rotor speed control simulation is realized by variable transmission ratio. Through the numerical simulation under steady flow conditions, Rotor speed control process on the main rotor and the engine state. The results show that the proposed rotor speed control simulation method can change the rotor speed continuously by 25% under the premise of ensuring that the variation of the power turbine speed of the turboshaft power turbine is less than 1.5%. The integrated model of the helicopter / transmission system / Design and verification provide a more reliable digital simulation platform.