Optimum Design of Cantilevered Piezoelectric Harvester Based on Distributed Parameter Model

2011 ◽  
Author(s):  
Saad F. Alazemi ◽  
Ahmet S. Yigit ◽  
Khaled A. Alhazza
Keyword(s):  
Power Generation ◽  
Mechanical Energy ◽  
Broad Band ◽  
Average Power ◽  
Electrical Energy ◽  
Distributed Parameter ◽  
Fe Model ◽  
Physical Constraints ◽  
Distributed Parameter Model ◽  
Design Variables

In the past decade, there have been numerous studies which showed the feasibility of harvesting electrical energy from vibrating structures. The main goal of this study is first to generate a Finite Element (FE) model using ANSYS to verify an existing harvesting model. This FEM model can be used as a base for designing more complex harvesters. The second goal of this study is to optimize the parameters of a simple cantilever harvester to maximize the power generation from ambient mechanical energy. A distributed parameter model and its modal solution are used to identify the design variables through a parametric study. The results obtained using the distributed parametric model is compared with the results obtained using ANSYS. It is of interest to ensure adequate power generation under non-resonant conditions for a broad band excitation. The average power within a certain frequency range is used as the cost function to define optimization problem along with some geometric and physical constraints. We found that, in certain frequency ranges, the parameters can be optimized to generate maximum power. Having validated the methodology, work is in progress to design and optimize harvesters with complex geometries.

Power Generation Performance of a Spherical Robot With Pendulums in Amphibious Environment

2021 ◽  
Author(s):  
Yansheng Li ◽  
Meimei Yang ◽  
Bo Wei ◽  
Yi Zhang
Keyword(s):  
Power Generation ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Spherical Robot ◽  
Experiment Platform ◽  
Voltage Balance ◽  
Physical Prototype ◽  
Physics Experiment ◽  
New Generation ◽  
Power Generation Performance

Abstract The energy of mobile robots severely limits their range of motion and work capabilities. This paper proposes a method of capturing energy from the amphibious environment for a spherical robot with pendulums. The movement of pendulums is analyzed during amphibious movement, and a feasible scheme is proposed for a pendulum to capture environmental energy and convert mechanical energy into electrical energy. The mathematical model of the swing power generation is established based on the pendulum dynamic equation and voltage balance equation. The physics experiment platform and virtual experimental platform are built to analyse the power generation performance. Furthermore, the power generation mathematical models are established respectively for the spherical robot rolling on the slope and floating in the water, and the power generation performance is analyzed and summarized under different conditions. The results show that the proposed power generation method and scheme can effectively supply the energy to the spherical robot, can enhance the endurance of the movement in the amphibious environment, and provide theoretical guidance for the development of the physical prototype of the new generation of amphibious spherical robot.

scholarly journals Maximum Obtainable Energy Harvesting Power from Galloping-Based Piezoelectrics

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Mohammad Yaghoub Abdollahzadeh Jamalabadi ◽  
Mostafa Safdari Shadloo ◽  
Arash Karimipour
Keyword(s):  
Energy Harvesting ◽  
Cantilever Beam ◽  
Bluff Body ◽  
Mechanical Energy ◽  
Average Power ◽  
Electrical Energy ◽  
Load Resistance ◽  
Nonlinear Motion ◽  
Rc Circuit ◽  
Deflection Limit

In this paper, the maximum obtainable energy from a galloping cantilever beam is found. The system consists of a bluff body in front of wind which was mounted on a cantilever beam and supported by piezoelectric sheets. Wind energy caused the transverse vibration of the beam and the mechanical energy of vibration is transferred to electrical charge by use of piezoelectric transducer. The nonlinear motion of the Euler–Bernoulli beam and conservation of electrical energy is modeled by lumped ordinary differential equations. The wind forces on the bluff body are modeled by quasisteady aeroelasticity approximation where the fluid and solid corresponding dynamics are disconnected in time scales. The linearized motion of beam is limited by its yield stress which causes to find a limit on energy harvesting of the system. The theory founded is used to check the validity of previous results of researchers for the effect of wind speed, tip cross-section geometry, and electrical load resistance on onset speed to galloping, tip displacement, and harvested power. Finally, maximum obtainable average power in a standard RC circuit as a function of deflection limit and synchronized charge extraction is obtained.

Review on Savonius Rotor for Harnessing Wind Energy

2012 ◽  
Vol 36 (6) ◽  
pp. 605-645 ◽  
Author(s):  
K. Golecha ◽  
M. A. Kamoji ◽  
S. B. Kedare ◽  
S. V. Prabhu
Keyword(s):  
Power Generation ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Vertical Axis ◽  
Performance Characteristics ◽  
Savonius Rotor ◽  
Water Pumping ◽  
Bladed Rotor ◽  
Rotor Shape ◽  
Starting Torque

Wind machines convert kinetic energy of the wind into usable form of mechanical energy or electrical energy. The Savonius rotor is a vertical axis wind machine which is simple in design. High starting torque characteristics make it suitable for standalone power generation as well as water pumping applications. This paper reviews the literature on the performance characteristics of the Savonius rotor. Multi-bladed rotor, multistage rotor, shape of the blade, use of deflecting plate, guide vanes and nozzle augmentation are several ways to enhance the performance characteristics. This review would help an engineer in building an improved Savonius rotor for a given application.

scholarly journals Development of Piezoelectric Energy Harvester System through Optimizing Multiple Structural Parameters

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2876
Author(s):  
Hailu Yang ◽  
Ya Wei ◽  
Weidong Zhang ◽  
Yibo Ai ◽  
Zhoujing Ye ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Harvesting ◽  
Energy Harvester ◽  
Structural Parameters ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Cross Sectional ◽  
Accelerated Pavement Testing ◽  
Piezoelectric Energy ◽  
Pavement Testing

Road power generation technology is of significance for constructing smart roads. With a high electromechanical conversion rate and high bearing capacity, the stack piezoelectric transducer is one of the most used structures in road energy harvesting to convert mechanical energy into electrical energy. To further improve the energy generation efficiency of this type of piezoelectric energy harvester (PEH), this study theoretically and experimentally investigated the influences of connection mode, number of stack layers, ratio of height to cross-sectional area and number of units on the power generation performance. Two types of PEHs were designed and verified using a laboratory accelerated pavement testing system. The findings of this study can guide the structural optimization of PEHs to meet different purposes of sensing or energy harvesting.

An asymmetric magnetic-coupled bending-torsion piezoelectric energy harvester: modeling and experimental investigation

2021 ◽  
Author(s):  
Huirong Zhang ◽  
Wentao Sui ◽  
Chongqiu Yang ◽  
Leian Zhang ◽  
Rujun Song ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Average Power ◽  
Harmonic Excitation ◽  
Lumped Parameter Model ◽  
Distributed Parameter ◽  
Piezoelectric Energy ◽  
Distributed Parameter Model ◽  
Piezoelectric Beam ◽  
Lumped Parameter ◽  
Torsion Energy

Abstract This paper presents a detailed investigation on an asymmetric magnetic-coupled bending-torsion piezoelectric energy harvester based on harmonic excitation. There is an eccentricity between the shape center of moving magnets and the axis of the piezoelectric beam, which results in the bending and torsion simultaneously in working condition. The distributed mathematical model is derived from the energy method to describe the dynamic characteristics of the harvester, and the correctness of the model is verified by experiments. To further demonstrate the improvement performance of the proposed energy harvester, the bending-torsion energy harvester (i.e. magnetic-coupled was not configured) is experimented and compared. The theoretical and experimental results indicate that the average power increases about 300% but the resonance frequency decreases approximately 2 Hz comparing to the harvester without magnetic-coupled. According to the characteristic of distributed parameter model, the magnetic force and the size of the piezoelectric beam are investigated respectively. And the lumped-parameter model is introduced to analyze the steady-state characteristic. Accordingly, this paper provides a feasible method to improve performance for piezoelectric energy harvester.

scholarly journals Numerical Analysis of Signal Response Characteristic of Piezoelectric Energy Harvesters Embedded in Pavement

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2770
Author(s):  
Hailu Yang ◽  
Qian Zhao ◽  
Xueli Guo ◽  
Weidong Zhang ◽  
Pengfei Liu ◽  
...  
Keyword(s):  
Power Generation ◽  
Numerical Study ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Response Characteristic ◽  
Asphalt Pavements ◽  
Horizontal Distance ◽  
Concrete Pavements ◽  
Energy Harvesters ◽  
Piezoelectric Energy

Piezoelectric pavement energy harvesting is a technological approach to transform mechanical energy into electrical energy. When a piezoelectric energy harvester (PEH) is embedded in asphalt pavements or concrete pavements, it is subjected to traffic loads and generates electricity. The wander of the tire load and the positioning of the PEH affect the power generation; however, they were seldom comprehensively investigated until now. In this paper, a numerical study on the influence of embedding depth of the PEH and the horizontal distance between a tire load and the PEH on piezoelectric power generation is presented. The result shows that the relative position between the PEH and the load influences the voltage magnitude, and different modes of stress state change voltage polarity. Two mathematic correlations between the embedding depth, the horizontal distance, and the generated voltage were fitted based on the computational results. This study can be used to estimate the power generation efficiency, and thus offer basic information for further development to improve the practical design of PEHs in an asphalt pavement.

A Review of Two Patents Relating to Novel Energy Harvesting Techniques to Provide Electrical Power On-Board Gun-Fired Projectiles

2010 ◽  
Author(s):  
Jahangir Rastegar ◽  
Richard Murray
Keyword(s):  
Power Generation ◽  
Energy Harvesting ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Electrical Energy ◽  
Harsh Environment ◽  
Logical Framework ◽  
Power Sources ◽  
Piezoelectric Elements ◽  
Harvesting Techniques

This is a review of two patents relating to electrical power generation on-board gun-fired munitions. The devices harvest mechanical energy from the motion of the projectile (e.g. the axial firing acceleration), and then convert the energy from mechanical to electrical using novel mechanisms and materials such as piezoelectric elements. The devices are particularly important for several reasons. Firstly, the devices are inherently safe because the root source of the electrical energy is the motion of the projectile; therefore no electrical energy can be produced until after the projectile is fired. Second, the devices have a much longer shelf-life than competing electrical power sources such as batteries. Finally, the devices are simple, rugged, and reliable making them ideal for the harsh environment on-board gun-fired projectiles. In addition to presenting the general approach, the logical framework of the patented embodiments is presented, especially with respect to the types of motion used for harvesting and the challenges presented by the varied magnitudes of those motions in different weapon platforms.

Design of Fitness Device with Power Generation and Multi-Function

2014 ◽  
Vol 624 ◽  
pp. 377-380
Author(s):  
Hai Fei Qiu ◽  
Jin Wei He ◽  
Long Gu
Keyword(s):  
Power Generation ◽  
Daily Life ◽  
Group Structure ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Test Results ◽  
Available Energy ◽  
Physical Prototype ◽  
Safe Load ◽  
Actual Test

In this paper, a fitness device which could generate electricity was designed into rod group structure based on theoretical calculation and experiment. The device could make mechanical energy into electrical energy in process of fitness, and the storage power could used to daily life lighting and small household electrical appliances power. Physical prototype of the device was developed successfully, the actual test results show that, the safe load of the device was 100kg, the charging voltage was 5V and 12V. People could generated available energy in process of fitness, positivity of fitness for people were removed, in results, the device contained certain practical value of popularization.

scholarly journals Footstep Power Generation Using Piezoelectric Material

2021 ◽  
Vol 9 (VII) ◽  
pp. 3623-3626
Author(s):  
Gaurav Thapliyal
Keyword(s):  
Power Generation ◽  
Mechanical Energy ◽  
Cost Effective ◽  
Electrical Energy ◽  
Energy System ◽  
Energy Resources ◽  
Piezoelectric Sensors ◽  
Shopping Malls ◽  
Railway Stations ◽  
Generation Technique

In the day-to-day life, the utilization of power turns of being necessary for each work. This paper focuses on designing a setup that leads to the generation of electrical energy which is going to waste when humans are walking. There are different methods used to produce energy like conventional and non-conventional methods. In this project, we are doing generation of power by walking or running. Power can be generated by walking on the stairs. The generated power will be stored and then we can use it for domestic purposes. The paper proposes a novel technique for the creation of power utilizing piezoelectric sensors kept along the footpaths which can be ready to charge the battery and ready to supply the force at whatever time of our prerequisite. The non-conventional energy system is very essential currently to our nation. Nonconventional energy using footstep is converting mechanical energy into Electrical Energy. Due to this a lot of energy resources have been exhausted and wasted. This system can be installed at homes, schools, colleges, where people move around the clock. The footstep power generation technique through piezoelectric sensors produces electrical force by changing piezoelectric force generation framework is that is sheltered and secure to utilize it does not make any issue or distress for the general population strolling through the footpath, and it is a free strategy. This project will be cost-effective and easy to be installed in populated areas like railway stations, bus stands, and shopping malls. Our project is cost-effective and easy to implement.

Electrical Power Generation through Speed Breaker

2021 ◽  
Vol 9 (9) ◽  
pp. 955-959
Author(s):  
Raunak Raj
Keyword(s):  
Power Generation ◽  
Kinetic Energy ◽  
Human Life ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Electrical Energy ◽  
Energy Sources ◽  
Power Generating Unit ◽  
Moving Vehicles ◽  
Future Demands

Abstract: In the present situation power becomes basic need for human life. Energy is responsible for major developments of any country’s economy. Conventional energy sources generate most of the energy of today’s world. But the population is increasing day by day and the conventional energy sources are diminishing. Moreover, these conventional energy sources are polluting and responsible for global warming. So, nonconventional sources are needed to be developed for power generation which are clean, environment friendly and sustainable. In this research we propose a renewable non-conventional energy source based on speed breaker mechanism. Our project is to enlighten the streets utilizing the jerking pressure which is wasted during the vehicles passes over speed breaker in roadside. We can tap the energy generated by moving vehicles and produce power by using the speed breaker as power generating unit. The kinetic energy of the moving vehicles can be converted into mechanical energy through rack and pinion mechanism and this mechanical energy will be converted to electrical energy using generator which will be used for lighting the street lights. Therefore, by using this mechanism we can save lot of energy which can fulfill our future demands. Keywords: kinetic energy, speed breaker, rack & pinion, generator, non-conventional energy, street light.

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