The process of rotor speed variation under tiltrotor cruise state has been studied, and the integrated variable speed control method of tiltrotor based on two-speed gearbox is proposed. Firstly, a nonlinear model predictive controller (NMPC) based on state variable model of the component-level model of the turboshaft engine is designed. Then based on the integrated engine model, the two-speed dual path tiltrotor driveline comprehensive simulation model was developed by utilizing gear kinematics theory, blade element analysis and the theory of classical mechanics. Finally, both a Parallel Shift Control (PSC) strategy and a Sequential Shift Control (SSC) strategy in tiltrotor cruise state were analyzed and compared with conventional PID controller. It is shown that the rotors’ speed can synchronously vary by 50 percent under the PSC strategy in tiltrotor cruise state. Meanwhile, disengaging the engine in turn by freewheel clutches can reduce the rotors’ speed from 190 rpm to 102.5 rpm along the specified path under the SSC strategy. The overshoot and droop amount of the power turbine speed can be reduced to less than 1.5 % with the steady error no more than 0.2 % through NMPC, which realizes the fast response control of the turboshaft engine.

中文翻译：

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基于二速齿轮箱的旋耕机变转速综合控制方法研究

研究了倾转转子巡航状态下的转子转速变化过程，提出了基于二速变速箱的倾转转子集成变速控制方法。首先，设计了基于涡轮轴发动机零件级模型状态变量模型的非线性模型预测控制器（NMPC）。然后在集成发动机模型的基础上，利用齿轮运动学，叶片单元分析和经典力学理论，建立了双速双路径摆线传动系统综合仿真模型。最后，对倾转转子巡航状态下的并行换挡控制（PSC）策略和顺序换挡控制（SSC）策略进行了分析，并与传统的PID控制器进行了比较。结果表明，在倾斜转子巡航状态下，在PSC策略下，转子的速度可以同步变化50％。同时，在SSC策略下，通过空转离合器依次分离发动机可使转子沿指定路径的转速从190 rpm降低到102.5 rpm。通过NMPC可以将动力涡轮转速的过冲和下垂量降低到小于1.5％，并且稳定误差不超过0.2％，从而实现了涡轮轴发动机的快速响应控制。