REG: Equipment to Modernize a Subsonic Wind Tunnel for Gust Simulation and Measurment

用于阵风模拟和测量的亚音速风洞将进行改装，并配备新的控制系统。所采用的阵风发生器是一种基于最近获得专利的概念--旋转开槽气缸的新型装置。该控制系统和设备将在飞行器和旋翼机的非线性气动弹性研究中有广泛的应用，特别是在应用气动反馈技术降低飞行器和旋翼机的响应方面。这种阵风发生器和相关的控制系统也有可能为桥梁和建筑物的比例模型提供一种新颖和改进的空气动力或风激励源。借助于风洞阵风发生器，可以在非旋转叶片模型上模拟作用在旋转叶片上的气动载荷的简谐分量。因此，可以利用阵风发生器在转子叶片系统的特定谐波处产生模型的气动激励，从而研究降低叶片振动响应的高次谐波控制(HHC)概念。旋翼模型反馈控制系统将基于类似于阵风发生器系统的基于PC的控制器，或者基于简单的模拟反馈控制器。无论控制器是什么，系统软件都将提供输入简单控制律算法或系数的能力。*/

A subsonic wind tunnel for gust simulation and measurement will be modified and regimented with a new control system. The gust generator employed is a novel device based upon a recently patented concept, the rotation slotted cylinder. The control system and equipment will have wide applications for nonlinear aeroelastic investigations for aircraft and rotorcraft, especially for the application of aerodynamic feedback techniques to reduce aircraft and rotorcraft response. There is also the potential for the use of this gust generator and associated control system to provide a novel and improve aerodynamic or wind excitation source for scaled models of bridges and buildings. By means of a wind-tunnel gust generator, the harmonic components of aerodynamic loads acting on a rotating blade can be simulated on a non-rotating blade model. Higher harmonic control (HHC) concepts for reducing blade vibration response can therefore be investigated using the gust generator to produce aerodynamic excitation of the model at specified harmonics of a rotor blade system. The rotor blade model feedback control system will be based either on a PC-based controller similar to that planned for the gust generator system or on a simple analog feedback controller. Regardless of the controller, the system software will provide the ability to enter a simple control law algorithm or coefficients.*** //