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首页> 外文期刊>Journal of the American Helicopter Society >Closed-Loop Test of a Rotor with Individually Controlled Trailing-Edge Flaps for Vibration Reduction
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Closed-Loop Test of a Rotor with Individually Controlled Trailing-Edge Flaps for Vibration Reduction

机译：带有单独控制的后缘襟翼的转子的闭环测试，用于减少振动

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摘要

A control method is proposed to reduce vibrations in helicopters using active trailing-edge flaps on the rotor blades. Each blade is controlled independently, taking into account possible blade and actuator dissimilarities. The rotor is modeled as a linear-time-periodic system, which is identified by linear quadratic estimation (Kalman filter). After an initial open-loop system identification phase using random actuation commands, optimal actuation commands are computed by linear quadratic regulation, and both closed-loop control and system identification are performed simultaneously at each time step. Closed loop tests are conducted using a four-bladed rotor with piezo-bender trailing-edge flaps. The rotor model is fitted on a bearingless model-scale hub and tested on a hover stand. These tests demonstrate the controller's ability to account for blade and actuator dissimilarities and generate different optimal inputs for each blade. The 1/rev normal force could be reduced by more than 90% using small amplitude flap deflections (about ±2 deg). During most closed-loop tests, the maximum allowable input to the actuators is reached. It is found that the method used to account for actuator saturation and maintain actuator input within acceptable limits has an important effect on controller performance. The best controller performance is obtained when control inputs are computed by solving a constrained minimization problem.
机译：提出了一种控制方法，该方法通过使用转子叶片上的主动后缘襟翼来减少直升机的振动。考虑到可能的叶片和执行器的不相似性，每个叶片都是独立控制的。转子被建模为线性时间周期系统，该系统通过线性二次估计（卡尔曼滤波器）进行识别。在使用随机执行命令的初始开环系统识别阶段之后，通过线性二次调节来计算最佳执行命令，并且在每个时间步同时执行闭环控制和系统识别。闭环测试使用带有压电弯曲后缘襟翼的四叶转子进行。转子模型安装在无轴承的模型轮毂上，并在悬停支架上进行了测试。这些测试证明了控制器能够解决叶片和执行器的差异并为每个叶片生成不同的最佳输入的能力。使用较小幅度的襟翼偏转（大约±2度），1 / re法向力可以减小90％以上。在大多数闭环测试中，达到了执行器的最大允许输入。已经发现，用于考虑致动器饱和并且将致动器输入维持在可接受的范围内的方法对控制器性能具有重要影响。通过解决约束最小化问题来计算控制输入时，可以获得最佳的控制器性能。

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