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Measurement of twist deflection in active twist rotor

机译：主动扭转转子中扭转挠度的测量

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ABSTRACT Since the early days of rotary wing aircrafts the unsteady flow conditions in the rotor disk and unbalanced masses are causing intense vibratory loads and noise. Even modern helicopters still suffer from these drawbacks. This diminishes the ride quality as well as the public acceptance of rotary wing aircrafts. Further on the vibrations present a physical load for the pilot which reduces his concentration and can therefore not be neglected. Hence in the past there were numerous attempts to overcome these drawbacks. One of the most promising approaches evolved from a secondary control of the swash plate to an additional pitch angle of individual rotor blades applied at the blade root and further on to the control of the individual deformation of blades. The last step in this evolution became an option when smart materials like piezoceramics were used as actuators in the passive structure of traditional rotor blades. Since the actuators and their field of application are quite new, their capability to perform under strong centrifugal loads has to be proven. Within this work one concept for the active deformation of rotor blades will be presented. The evaluation of active twist blades under centrifugal loads is quite a challenge. Ether the data has to be acquired in the rotating frame and transmitted outside or the data has to be captured from outside, which demands a great deal of the sensors due to the high speed of the rotation. This investigation focuses on the design and evaluation of different measuring concepts to deliver reliable data of the blade actuation in the rotating system under full centrifugal loads. Most interesting is the determination of the blade tip twist angle.
机译：摘要自旋翼飞机诞生之初，旋翼盘中的不稳定流动状况和不平衡质量就引起了强烈的振动载荷和噪声。甚至现代直升机仍然遭受这些缺点的困扰。这降低了乘坐质量以及旋翼飞机的公众接受度。此外，在振动上给飞行员带来了物理负荷，这降低了他的注意力，因此不能忽略。因此，过去进行了许多尝试来克服这些缺点。最有前途的方法之一是从斜盘的辅助控制发展到施加在叶片根部的单个转子叶片的附加俯仰角，然后进一步控制叶片的单个变形。当将诸如压电陶瓷之类的智能材料用作传统转子叶片的被动结构中的致动器时，这一发展的最后一步成为了选择。由于执行器及其应用领域很新，因此必须证明其在强离心负载下的性能。在这项工作中，将提出一种转子叶片主动变形的概念。在离心载荷下评估主动式扭转叶片是一个很大的挑战。否则，必须在旋转框架中获取数据并将其传输到外部，或者必须从外部捕获数据，由于旋转速度很高，因此需要大量传感器。这项研究着重于设计和评估不同的测量概念，以在完全离心负载下提供旋转系统中叶片致动的可靠数据。最有趣的是确定叶片尖端扭转角。

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