Related Experiment Video
Updated: Sep 1, 2025
09:51
A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
Published on: February 20, 2019
25.5K
Smart Active Vibration Control System of a Rotary Structure Using Piezoelectric Materials
Ali Hashemi1, Jinwoo Jang1, Shahrokh Hosseini-Hashemi2
1Department of Civil, Environmental and Geomatics Engineering, Florida Atlantic University, Boca Raton, FL 33431, USA.
Sensors (Basel, Switzerland)
|August 12, 2022
Summary
This study introduces a smart active vibration control system using piezoelectric actuators and a linear quadratic regulator controller to reduce wind turbine blade vibrations. The system effectively suppresses transverse deflections and flap-wise displacement, enhancing blade stability.
Area of Science:
- Mechanical Engineering
- Aerospace Engineering
- Control Systems
Background:
- Wind turbine blades experience significant vibrations due to external forces, impacting performance and longevity.
- Active vibration control (AVC) systems offer a promising solution for mitigating these detrimental effects.
- Piezoelectric (PZT) actuators are effective for implementing AVC due to their rapid response and precise control capabilities.
Purpose of the Study:
- To propose and validate a smart active vibration control (AVC) system for wind turbine (WT) blades.
- To develop a semi-analytical method for accurately modeling WT blade dynamics and deflections.
- To assess the effectiveness of a linear quadratic regulator (LQR) controller integrated with PZT actuators in suppressing blade vibrations.
Main Methods:
- A semi-analytical solution was developed by modeling the WT blade as an Euler-Bernoulli beam.
- Governing equations were derived by integrating PZT actuator dynamics into the beam's vibration equations.
- A finite element model was created, and a transfer function matrix was used to map beam dynamics to the WT blade.
- An LQR controller was designed using state-feedback control law and tuned with weighting factors.
Main Results:
- The semi-analytical method showed satisfying agreement with the finite element model results.
- The accuracy of the method decreased with increased sensor distance from the turbine base.
- The LQR controller demonstrated significant performance in vibration suppression by minimizing control input weights.
- The proposed AVC system effectively reduced vibration peaks and controlled maximum flap-wise displacement at the blade tip.
Conclusions:
- The developed smart AVC system, incorporating PZT actuators and an LQR controller, is highly effective in mitigating wind turbine blade vibrations.
- The semi-analytical approach provides a reliable and efficient tool for analyzing and controlling WT blade dynamics.
- The study highlights the potential for enhanced wind turbine performance and structural integrity through advanced active control strategies.
Related Concept Videos
01:19Vibrating Concrete
171
Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
171
01:22Mechanical Systems
266
Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
266