A Decoupled Unified Observation Method of Stochastic Multidimensional Vibration for Wind Tunnel Models

Abstract

Active vibration control is the most effective method for stochastic multidimensional vibration in wind tunnel tests, in which vibration monitoring is the core foundation. Vibrations are induced by the disturbances of several complex air flow instabilities under extreme test conditions with high attack angles. Here, a decoupled unified observation method is proposed in order to fully monitor stochastic multidimensional vibration. First, stochastic multidimensional vibration is explained using the Cartesian coordinate system. Then, the multidimensional vibration decoupling of the pitch plane and the yaw plane is realized according to the proposed decoupling design principle of the long cantilever sting. A unified observation method is presented, based on inertial force theory, to observe multidimensional vibration due to acceleration in each decoupling plane. Verification experiments were conducted in lab and a transonic wind tunnel, using an established real-time monitoring system. The results of lab experiments indicate that, in the frequency region of 0–120 Hz, three vibration modes of a selected stochastic vibration can be decoupled and observed through the vibration components in pitch plane and yaw plane. In addition, wind tunnel tests were carried out according to the working conditions (α = −4~10° with γ = 45°) at Ma = 0.6 and Ma = 0.7, respectively. The results show that six vibration modes of two selected stochastic vibrations can be decoupled and observed through the vibration components in pitch plane and yaw plane. The experimental results prove that stochastic vibration can be fully monitored in multiple dimensions through the vibration components in pitch plane and yaw plane using the proposed decoupled unified observation method. Therefore, these results lay the foundation for active vibration control.

Piezoelectric adaptive active vibration suppression for wind-tunnel model support sting

“…is prone to flow-induced vibration problems, causing largeamplitude and low-frequency vibration of the model support system. Especially in the high-speed or high attack angle tests, the vibration amplitude increases sharply, and even divergent vibration occurs, threatening the safe operation of the wind tunnel [2]. As a result, an efficient wind-tunnel model support sting damping system is required to suppress structural vibration in the concerned frequency band.…”

Dynamic modeling and disturbance rejection compensation for hysteresis nonlinearity of high voltage piezoelectric stack actuators

“…Among them, piezoelectric stack actuators made of piezoelectric ceramic materials have received a lot of attention in the application of active vibration control (AVC) in structure engineering, especially for the requirements of aerospace structures, which have strict constraints on the weight, installation space, and actuation capacity of actuators [9]. As a result, high voltage piezoelectric stack actuators (HVPSA) with a higher nominal output force and load capacity have a high potential for application [10][11][12][13][14][15]. For example, Liu et al used HVPSA to create a sting-root embedded active damping device in the wind tunnel model support system to suppress the destructive low-frequency and large-amplitude resonance caused by flow separation and turbulence [9,10].…”