Multidimensional Vibration Suppression Method with Piezoelectric Control for Wind Tunnel Models

Abstract

In wind tunnel tests, the low-frequency and large-amplitude vibration of the cantilever sting result in poor test data in pitch plane and yaw plane, more seriously, even threatens the safety of wind tunnel tests. To ensure the test data quality, a multidimensional vibration suppression method is proposed to withstand the vibration from any direction, which is based on a system with stackable piezoelectric actuators and velocity feedback employing accelerometers. Firstly, the motion equation of the cantilever sting system is obtained by Hamilton’s principle with the assumed mode method. Then, the multidimensional active control mechanism is qualitatively analyzed and a negative velocity feedback control algorithm combined with a root mean square (RMS) evaluation method is introduced to realize active mass and active damping effect, meanwhile, a weight modification method is performed to determine the sequence number of the stacked piezoelectric actuators and the weight of control voltages in real time. Finally, a multidimensional vibration suppression system was established and verification experiments were carried out in lab and a transonic wind tunnel. The results of lab experiments indicate that the damping ratio of the system is improved more than 4.3 times and the spectrum analyses show reductions of more than 23 dB. In addition, wind tunnel test results have shown that for the working conditions (α = −4~10° with γ = 0° or α = −4~10° with γ = 45°) respectively at 0.6 Ma and 0.7 Ma, the remainder vibration is less than 1.53 g, which proves that the multidimensional vibration suppression method has the ability to resist vibration from any direction to ensure the smooth process of wind tunnel tests.

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].…”

“…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]. However, the inherent hysteresis of the piezoelectric stack actuators has introduced some challenges in their application [16,17].…”

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

“…These aerodynamic characteristics cannot be tested at all if the vibration is not effectively suppressed. At present, the most effective method to suppress this serious stochastic multidimensional vibration is the active vibration control method [5,6], wherein vibration is monitored as feedback by vibration sensors; after real-time calculations with a control strategy, actuators are driven to output reverse force or moment to suppress system vibration [7]. Vibration monitoring is the core foundation of active vibration control.…”

Multidimensional System Identification and Active Vibration Control of a Piezoelectric-Based Sting System Used in Wind Tunnel

“…However, the cantilever sting is intended from 3 to 5 times longer than the test model, which suggests its inherent low structural damping [2]. When the aircraft model sweeps to large angle-of-attack, vibration would occur easily on the model both in pitch and yaw directions, which is harmful for the experimental data [3]. erefore, aiming at suppressing the vibration, many scholars have tried different control methods.…”

“…e experiments suppressed over 90% of the vibration amplitude, and the power spectrum density (PSD) was reduced at least 26 dB/Hz. Liu et al [3,19] applied a root mean square (RMS) evaluation method, and the results indicate that the damping ratio is improved more than 4 times.…”