scholarly journals Damping Analyses of Structural Vibrations and Shunted Piezoelectric Transducers

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Saber Mohammadi ◽  
Akram Khodayari
Keyword(s):  
Mechanical Energy ◽  
Electrical Energy ◽  
Piezoelectric Transducers ◽  
Control Technique ◽  
Structural Vibrations ◽  
Electric Networks ◽  
Pulse Switching ◽  
Electromechanical Energy Conversion ◽  
Electromechanical Energy ◽  
Mechanical Energy Dissipation

Piezoelectric transducers in conjunction with appropriate electric networks can be used as a mechanical energy dissipation device. Alternatively, undesired mechanical energy of a structure could be converted into electrical energy that can be dissipated through a shunt network in the form of Joule heating. This paper presents an experimental method to calculate damping energy in mechanical systems. However, the mathematical description of damping mechanism is much more complicated, and any process responsible for the occurrence of damping is very intricate. Structural and piezoelectric damping are calculated and analysed in the case of pulse switching or SSDI semiactive vibration control technique. This technique which was developed in the field of piezoelectric damping consists in triggering the inverting switch on each extremum of the piezoelectric voltage which induces an increase of the electromechanical energy conversion.

Reduction of structural vibrations with the piezoelectric stacks ring

2020 ◽  
Vol 64 (1-4) ◽  
pp. 729-736
Author(s):  
Jincheng He ◽  
Xing Tan ◽  
Wang Tao ◽  
Xinhai Wu ◽  
Huan He ◽  
...  
Keyword(s):  
Vibration Control ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Structural Vibrations ◽  
Rotor Systems ◽  
Fea Model ◽  
Piezoelectric Stacks ◽  
Shunt Damping ◽  
Reduction Effect ◽  
Euler Bernoulli Beam

It is known that piezoelectric material shunted with external circuits can convert mechanical energy to electrical energy, which is so called piezoelectric shunt damping technology. In this paper, a piezoelectric stacks ring (PSR) is designed for vibration control of beams and rotor systems. A relative simple electromechanical model of an Euler Bernoulli beam supported by two piezoelectric stacks shunted with resonant RL circuits is established. The equation of motion of such simplified system has been derived using Hamilton’s principle. A more realistic FEA model is developed. The numerical analysis is carried out using COMSOL® and the simulation results show a significant reduction of vibration amplitude at the specific natural frequencies. Using finite element method, the influence of circuit parameters on lateral vibration control is discussed. A preliminary experiment of a prototype PSR verifies the PSR’s vibration reduction effect.

Design and Analysis of a XY Micro-Motion Stage Based on S Type Flexible Mechanism

2014 ◽  
Vol 635-637 ◽  
pp. 1216-1219
Author(s):  
Yue Min Yu
Keyword(s):  
Smart Materials ◽  
Piezoelectric Materials ◽  
Electrical Energy ◽  
Active Materials ◽  
Flexure Mechanism ◽  
Electromechanical Energy Conversion ◽  
Electromechanical Energy ◽  
Flexible Mechanism ◽  
Micro Motion ◽  
Motion Stage

Piezoelectric materials is a kind of the most common smart materials whose geometric shape can be related to an energy input in the form of electric field. In the application of active materials to electromechanical energy conversion, electrical energy may be input to the material and the resulting deformation of the material can be used to move a load. In this paper, a XY micro-motion stage is designed based s type flexure mechanism and driven through piezoelectric ceramic stack. From the analysis, it can achieve X direction 6.5μm, Y direction 9.7μm micro-displacement output.The results indicate that, the XY micro-motion stage all are satisfy the need of design.

scholarly journals A Methodological Review of Piezoelectric Based Acoustic Wave Generation and Detection Techniques for Structural Health Monitoring

2013 ◽  
Vol 2013 ◽  
pp. 1-22 ◽  
Author(s):  
Zhigang Sun ◽  
Bruno Rocha ◽  
Kuo-Ting Wu ◽  
Nezih Mrad
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Acoustic Waves ◽  
Life Cycle Cost ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Piezoelectric Transducers ◽  
Detection Techniques ◽  
Structural Health ◽  
Acoustic Wave Generation

Piezoelectric transducers have a long history of applications in nondestructive evaluation of material and structure integrity owing to their ability of transforming mechanical energy to electrical energy and vice versa. As condition based maintenance has emerged as a valuable approach to enhancing continued aircraft airworthiness while reducing the life cycle cost, its enabling structural health monitoring (SHM) technologies capable of providing on-demand diagnosis of the structure without interrupting the aircraft operation are attracting increasing R&D efforts. Piezoelectric transducers play an essential role in these endeavors. This paper is set forth to review a variety of ingenious ways in which piezoelectric transducers are used in today’s SHM technologies as a means of generation and/or detection of diagnostic acoustic waves.

Control of Structural Vibration Using Shunt Piezoelectric Materials

2013 ◽  
Vol 303-306 ◽  
pp. 3-6
Author(s):  
Qi Bo Mao
Keyword(s):  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Structural Vibration ◽  
Switching Circuit ◽  
Structural Vibration Control ◽  
Pulse Switching ◽  
Piezoelectric Patch ◽  
Base Structure ◽  
Shunt Circuit

In this study, structural vibration control using semi-active shunt piezoelectric damping circuits is presented. A piezoelectric patch with an electrical shunt circuit is bonded to a base structure. When the structure vibrates, the piezoelectric patch strains and transforms the mechanical energy of the structure into electrical energy, which can be effectively dissipated by the shunt circuit. Hence, the shunt circuit acts as a means of extracting mechanical energy from the base structure. In this study, a pulse-switching circuit is imposed as the semi-active shunt piezoelectric damping to reduce the structural vibration. The switch-law for the pulse-switching circuit is discussed in detail, and the detailed numerical calculations are given and discussed. It is found that the pulse-switching circuit is more stable than passive piezoelectric circuit (such as RL series circuit) with regard to structural stiffness variations.

Digital Simulation of Saturated Electro-mechanical Energy Converters

1977 ◽  
pp. 22-57
Author(s):  
M. Ridzuan Salleh
Keyword(s):  
Energy Conversion ◽  
Mechanical Energy ◽  
Digital Simulation ◽  
Bond Graph ◽  
Electrical Machines ◽  
Graph Analysis ◽  
Transformation Matrices ◽  
Electromechanical Energy Conversion ◽  
Electromechanical Energy ◽  
Mathematical Equations

Based on th e now familiar Bond Graph analysis the process of electromechanical energy conversion in electrical machines is studied in detail. The paper avoids the use of transformation matrices and relies on the diagramatic representations which evolve from the bond graph method to extract the necessary mathematical equations for subsequent digital simulation.

scholarly journals Dielectric Elastomer Generator for Electromechanical Energy Conversion: A Mini Review

2021 ◽  
Vol 13 (17) ◽  
pp. 9881
Author(s):  
Kui Di ◽  
Kunwei Bao ◽  
Haojie Chen ◽  
Xinjun Xie ◽  
Jianbo Tan ◽  
...  
Keyword(s):  
Large Scale ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Fast Response ◽  
High Energy ◽  
Dielectric Elastomer ◽  
Human Motion ◽  
High Energy Density ◽  
Small Scale ◽  
Electromechanical Energy Conversion

The dielectric elastomer generator (DEG) has attracted attention in converting mechanical energy into electrical energy, due to its high energy density, fast response, and light weight, which together make DEG a promising technology for electromechanical conversion. In this article, recent research papers on DEG are reviewed. First, we present the working principles, parameters, materials, and deformation modes of DEG. Then, we introduce DEG prototypes in the field of collecting mechanical energy, including small-scale applications for wind energy and human motion energy, and large-scale applications for wave energy. At the end of the review, we discuss the challenges and perspectives of DEG. We believe that DEG will play an important role in mechanical energy harvesting in the future.

scholarly journals A Novel Method for Electricity Generation from Footsteps Using Piezoelectric Transducers

2021 ◽  
Vol 12 (2) ◽  
pp. 810-817
Author(s):  
D. Sathisha, Et. al.
Keyword(s):  
Mechanical Energy ◽  
Electrical Energy ◽  
Piezoelectric Transducers ◽  
Energy Scavenging ◽  
Maximum Output ◽  
Hydro Power ◽  
Exothermic Reactions ◽  
Novel Method ◽  
Density Population ◽  
Multiple Units

The process of generation of mechanical energy of human footsteps and converting into electrical energy using piezoelectric transducer is discussed in this paper. This method of generation comes under the Energy scavenging section of renewable resources where wasted energy during regular processes such as heat during exothermic reactions is captured and converted. With the increase in energy consumption from handy electronic devices, the concept of harvesting alternative non-conventional energy in highly density population regions is a new interest of late. The model is a focused spring action between two tiles on to the piezoelectric transducers. This model contracts during a footstep and therefore allowing the mechanical input onto the transducers and converting this input into electrical output. This process is focused on footsteps upon multiple units across a pathway to generate maximum output with minimal monitoring. This type of generator is simply a secondary backup to coal or hydro power generation. The main feature of such generator is that this requires no conscious thought on the user’s part.

Analyze and Simulation of a Typical MEMS RPG Using MCNP Code

2008 ◽  
Author(s):  
sM. Mohamadian ◽  
S. A. H. Feghhi ◽  
H. Afarideh
Keyword(s):  
Mechanical Energy ◽  
Electrical Energy ◽  
Cellular Phones ◽  
Mems Devices ◽  
Beta Particles ◽  
Portable Electronics ◽  
Energy Conversion Process ◽  
Electromechanical Energy ◽  
Piezoelectric Unimorph ◽  
Nuclear Battery

Microbatteries are essential for portable electronics, cellular phones and MEMs devices to be miniaturized. Use of radioisotopes to realize nuclear microbatteries have been extensively researched. Electrical energy of a nuclear battery is produced from radioactive materials decaying by a suitable energy conversion process. Our approach in this paper is study of a direct collected charge to motion conversion. In this manuscript, the performance of radioisotope powered piezoelectric generator has been analyzed and simulated. The generator employs direct charging to convert radiated beta particles kinetic energy into stored electromechanical energy in a piezoelectric unimorph piezoelectricity to stored mechanical energy into extractable electrical energy.

Design and Analysis of a Micro-Motion Platform Based on Flexible Mechanism

2013 ◽  
Vol 397-400 ◽  
pp. 1543-1546
Author(s):  
Yue Min Yu
Keyword(s):  
Smart Materials ◽  
Piezoelectric Ceramic ◽  
Piezoelectric Materials ◽  
Electrical Energy ◽  
Motion Platform ◽  
Active Materials ◽  
Electromechanical Energy Conversion ◽  
Electromechanical Energy ◽  
Flexible Mechanism ◽  
Micro Motion

Piezoelectric materials is a kind of the most common smart materials whose geometric shape can be related to an energy input in the form of electric field. In the application of active materials to electromechanical energy conversion, electrical energy may be input to the material and the resulting deformation of the material can be used to move a load. In this paper, a micro-motion platform is designed based straight circular flexure hinge and driven through piezoelectric ceramic stack. The calculation formula of the natural frequency of the new micro-motion platform structure is derived. From the analysis, the deformation and stress of it are all under allowed value of 65Mn. The results indicate that, the micro-motion platform all are satisfy the need of design.

Control of Brake Squeal Using Shunted Piezoelectric Pads

2019 ◽  
Author(s):  
Yaqoub Abdullah ◽  
Amr Baz
Keyword(s):  
Automotive Industry ◽  
Mechanical Energy ◽  
Natural Extension ◽  
Electrical Energy ◽  
Brake System ◽  
Design Parameters ◽  
Disc Brake ◽  
Brake Squeal ◽  
Electric Networks ◽  
The Stability

Abstract Brake squeal phenomenon poses serious challenges to the automotive industry due to its technical complexity and the pressing need for mitigating its undesirable effects. More importantly, brake squeal causes significant customer dissatisfaction and adversely affects the subjective quality of the vehicles. These effects have substantial economic impact on the automotive industry. Furthermore, it is essential to properly treat the brake squeal problems in order to avoid unexpected catastrophic failure of the brake system. In this paper, it is proposed to mitigate the brake squeal problems by providing the brake pads with piezoelectric patches which are shunted by properly tuned electric networks. The shunted piezoelectric pads offer a unique ability to convert the mechanical energy induced by the brake squeal into electrical energy which can be dissipated into the network in order to enhance the damping and stability characteristics of the brake system. Accordingly, it is envisioned that the proposed approach would enable the disc brake systems to operate over broad ranges of operating parameters without experiencing the adverse effects of brake squeal. The proposed system is modeled by a simple two Degree-Of-Freedom (DOF) disc brake model. The structural DOF are integrated with the constitutive model of the shunted piezoelectric network in order to predict the threshold of brake squeal. The stability limits of the proposed brake system are established as a function of the design parameters of the shunted piezoelectric network. Numerical examples are presented to demonstrate the effectiveness of the proposed system in expanding the operating range of the brake system without experiencing squeal problems. Application of the proposed system to a distributed disc brake system model is a natural extension of the present work.

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