Active Vibration Control of the Sting Used in Wind Tunnel: Comparison of Three Control Algorithms

Xing Shen,Yuke Dai,Lei Zhang,Mingxuan Chen,Li Yu

doi:10.1155/2018/1905049

Xing Shen, Yuke Dai + Show 3 more

Open Access

https://doi.org/10.1155/2018/1905049

Copy DOI

Abstract

In wind tunnel tests, cantilever stings are often used as model-mount in order to reduce flow interference on experimental data. In this case, however, large-amplitude vibration and low-frequency vibration are easily produced on the system, which indicates the potential hazards of gaining inaccurate data and even damaging the structure. This paper details three algorithms, respectively, Classical PD Algorithm, Artificial Neural Network PID (NNPID), and Linear Quadratic Regulator (LQR) Optimal Control Algorithm, which can realize active vibration control of sting used in wind tunnel. The hardware platform of the first-order vibration damping system based on piezoelectric structure is set up and the real-time control software is designed to verify the feasibility and practicability of the algorithms. While the PD algorithm is the most common method in engineering, the results show that all the algorithms can achieve the purpose of over 80% reduction, and the last two algorithms perform even better. Besides, self-tuning is realized in NNPID, and with the help of the Observer/Kalman Filter Identification (OKID), LQR optimal control algorithm can make the control effort as small as possible. The paper proves the superiority of NNPID and LQR algorithms and can be an available reference for vibration control of wind tunnel system.

Highlights

In recent years, modern aircraft are gradually developing to light weight, high mobility, high speed, and high angle of attack, which apparently puts forward higher requirements for wind tunnel tests
When the model is exposed to aerodynamic loads from flow dynamic pressure, this flexible support system will produce low-frequency vibration and large-amplitude vibration, which will dramatically affect the accuracy of tests and even damage the structure. erefore, in order to enhance the safety and accuracy of experiments, it is of vital importance to reduce the vibration of the sting
In 2007, Balakrishna et al [1,2,3] proposed a scheme of embedding stacked piezoelectric actuators in the sting, and based on this thought, he had already developed three sets of vibration suppression systems until 2011. e related research in European Transonic Wind tunnel (ETW) can date back to 1996, and Hefer, in a patent, firstly proposed a device [4], which has six sets of piezoelectric ceramics encircled at the root or middle of the test sting to actively suppress the vibrations of the support system

Summary

Introduction

Modern aircraft are gradually developing to light weight, high mobility, high speed, and high angle of attack, which apparently puts forward higher requirements for wind tunnel tests. E related research in ETW can date back to 1996, and Hefer, in a patent, firstly proposed a device [4], which has six sets of piezoelectric ceramics encircled at the root or middle of the test sting to actively suppress the vibrations of the support system. On this basis, Fehren et al [5] proposed an improved scheme in 2001 and increased the number of piezoelectric actuators to 14

Methods

Results

Conclusion