Self-sensing Vibration Research Articles

Solid-liquid triboelectric nanogenerator based self-sensing vibration suppression device

Micro-vibrations adversely affect critical equipment, devices, and systems, resulting in economic losses and safety risks. Hence, the imperative tasks of monitoring and mitigating micro-vibrations present formidable challenges in the field of vibration control. This study introduces a solid-liquid triboelectric nanogenerator (TENG) based self-sensing vibration suppression device (S-L SVD) designed with a vertically structured configuration. This device not only possesses the capability to detect but also effectively reduce vibrations. The S-L SVD consists of an upper self-sensing unit utilizing liquid-silica synergy and a lower damping unit employing magnetic fluid (MF)-permanent magnet synergy. The S-L SVD exhibits a remarkable vibration monitoring sensitivity of 1.9 V/mm, enabling the detection of micro-vibrations with amplitudes as small as 0.368 mm. The self-sensing unit effectively functions as a miniature liquid tuned damper, substantially enhancing the device's damping capability, resulting in a noteworthy 19.6 % damping efficiency improvement. Leveraging solid-liquid TENG, the S-L SVD seamlessly integrates vibration monitoring and suppression, showcasing exceptional durability. This innovation not only provides valuable insights into vibration monitoring but also introduces novel approaches for improving damping performance. Furthermore, the device is well-suited for applications in energy-scarce and challenging maintenance environments.

Self-Sensing Vibration Suppression of Piezoelectric Cantilever Beam Based on Improved Mirror Circuit

The self-sensing technique allows a single piece of piezoelectric element to function simultaneously as an actuator and a sensor in a closed-loop system. This study proposes an improved vibration suppression system using the piezoelectric self-sensing technique whose usefulness is experimentally verified in a cantilever beam. A single piezoelectric element is bonded to the root of the beam and functions as an actuator and a sensor simultaneously. A mirror circuit constructed with two charge driver circuits is used to pick up the sensing signal from the driving voltage signal. Then, a closed-loop control strategy based on the proportion integration differentiation (PID) algorithm can adjust the sensing signal precisely to suppress the vibration of the cantilever beam quickly. The first mode of vibration is suppressed, and the amplitude of the vibration is actively dampened by a factor exceeding 96.4%. Moreover, the frequency sweep experiments demonstrate that with the PID feedback control circuit connected to the piezoelectric cantilever beam, the Q value of the system is greatly reduced, and the loss factor is increased from 0.053 to 0.288. The improved mirror circuit with PID control has a good suppression effect in the frequency range near the first order mode of the cantilever beam.

Self-Sensing Electromagnetic Transducer for Vibration Control of Space Antenna Reflector

Space antenna reflectors are used by space vehicles to communicate with ground stations. These reflectors are generally subject to broadband random vibration and shock conditions during shipment and vehicle launch. While active vibration control methods can reduce any unexpected responses, sensors, controllers, power amplifiers, and actuators are all required to implement the control system. These additional external devices increase both the weight and the cost of the reflector, and reduce the reliability and safety of the space product. This study proposes a novel self-sensing vibration control method and applies a self-sensing electromagnetic transducer to suppress the vibration of a space antenna reflector. This transducer is used bifunctionally, acting as both an isolator and a velocity sensor. The vibration control principle of the proposed method is analyzed. A governing equation is established using the finite element method. A type of degree of freedom reduction method is used to obtain the response of the space antenna reflector. A ground experiment is then set up. The results demonstrate that the proposed self-sensing vibration control method can reduce the second-order and third-order vibrations of the space antenna reflector by 4 and 9 dB, respectively.

Semi-active vibration control featuring a self-sensing SSDV approach

Abstract A self-sensing vibration control technique using nonlinear synchronized switch damping on the voltage sources (SSDV) is proposed in this article. SSDV, as one of effectively nonlinear vibration damping techniques, has been developed into several extensions in recent years, such as enhanced SSDV and adaptive SSDV. However, in the original SSDV and its extensions, the switch algorithm for the principle of SSDV technique is carried out by active real-time controllers (e.g., DSpace systems/Digital Signal Processors (DSPs)). In addition, external sensors are applied to measure the moment of the displacement extrema for the switch algorithm. By comparison, the proposed approach can realize the SSDV technique without real-time controllers and external sensors. Experimental investigations showed that the proposed technique exhibits excellent single-mode damping performance and is easy to implement.

Study on the Vibration Control Based on the Piezoelectric Self-Sensing Vibration Damper

<p>As the sensing element and a driving element for vibration control using smart materials, the structural vibration control is very active field for research and application. This paper mainly study the characteristics of piezoelectric self-sensing vibration .Through the action analysis of research on Piezoelectric Actuator establish a self-sensing piezoelectric vibration damper and a model of self-sensing piezoelectric absorber . Then through the experiment and simulation, get the study on its characteristics.</p>

A self-sensing method for switching vibration suppression with a piezoelectricactuator

This paper discusses a self-sensing vibration suppression method that measures only thevalue of the piezoelectric voltage. The method separates the electrical status into two casesconcerning electrical current and characterizes each of these to establish a self-sensingsystem using extended system equations and a Kalman filter. Our self-sensing system canavoid estimation blackout during closed-circuit status and lessen harmful influences fromresidual modes. Experiments revealed that the self-sensing system suppressed vibrations incooperation with state-switching and synchronized-switching controls. We confirmed thatthe self-sensing method is robust against model errors in a vibration suppressionexperiment in which there are model errors caused by an intentional frequency shift.

Self-Sensing Active Suppression of Vibration of Flexible Steel Sheet

In rolling processes, flexible steel sheet is supported by rollers and is bound to produce structural vibration. This vibration can cause severe problems to surface finish and affect the quality of the product. To overcome these problems, active vibration control has been proposed. This usually requires both sensors and actuators. The location of sensors and actuators plays a very important role in active vibration control. Moreover, a reliable sensor can be very expensive. This paper proposes a self-sensing vibration control using a push-pull type electromagnet to control the transverse vibration of the steel plate. The construction of the electromagnet has two types of coils, namely the bias coil and the control coil. Vibration displacement is estimated by using the mutual inductance change between the bias and the control coils. The estimated signal is proportional to the gap displacement. The proportional and derivative signals are fed back to the control coil to reduce the transverse vibration of the steel sheet. The proposed method is applied to a simple test rig to confirm the capability of the device. The results obtained are showing high possibility for reducing steel sheet vibration.