Topology Optimization Design of Implantable Energy Harvesting Device

2011 ◽  
Vol 55-57 ◽  
pp. 498-503
Author(s):  
Bin Zheng ◽  
Liang Ping Luo
Keyword(s):  
Topology Optimization ◽  
Energy Harvesting ◽  
Optimization Design ◽  
Mechanical Energy ◽  
Electric Energy ◽  
Structure Design ◽  
Mems Devices ◽  
Sensors And Actuators ◽  
Piezoelectric Energy ◽  
Piezoelectric Structure

When designing implantable biomedical MEMS devices, we must provide electric power source with long life and small size to drive the sensors and actuators work. Obviously, traditional battery is not a good choice because of its large size, limited lifetime and finite power storage. Living creatures all have non-electric energy sources, like mechanical energy from heart beat and pulse. Piezoelectric structure can convert mechanical energy to electric energy. In the same design condition, the more electric energy is generated, the better the piezoelectric structure design. This paper discusses the topology optimization method for the most efficient implantable piezoelectric energy harvesting device. Finally, a design example based on the proposed method is given and the result is discussed.

Topology Optimization of Piezoelectric Energy Harvesting Strap Buckle

2009 ◽  
Author(s):  
Bin Zheng ◽  
Hong-Zhong Huang ◽  
Hae Chang Gea
Keyword(s):  
Topology Optimization ◽  
Energy Harvesting ◽  
Electric Energy ◽  
Optimization Method ◽  
Piezoelectric Energy Harvesting ◽  
Wearable Electronics ◽  
Design Constraint ◽  
Piezoelectric Energy ◽  
Material Volume ◽  
Topology Optimization Method

In the past decades, the stagnant growth of battery technology becomes the bottle-neck of new generation of portable and wearable electronics which ask for longer work time and higher power consumption. Energy harvesting device based on the direct piezoelectric effect that converts ambient mechanical energy to usable electric energy is a very attractive energy source for portable and wearable electronics. This paper discusses the design of piezoelectric energy harvesting strap buckle that can generate as much as possible electric energy from the differential forces applying on the buckle. Topology optimization method is employed to improve the efficiency of piezoelectric energy harvesting strap buckle in a limited design space. A stiffness or displacement constraint is introduced to substitute material volume constraint in this problem formulation to avoid useless optimum result with nearly zero material volume. The sensitivities of both objective function and design constraint are derived from the adjoint method. A design example of piezoelectric energy harvesting strap buckle using the proposed topology optimization method is presented and the result is discussed.

scholarly journals Analytical, FEA, and Experimental Comparisons of Piezoelectric Energy Harvesting Using Engine Vibrations

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Abhay Khalatkar ◽  
V. K. Gupta ◽  
Ankit Agrawal
Keyword(s):  
Cantilever Beam ◽  
Mechanical Energy ◽  
Flexible Structures ◽  
Electric Energy ◽  
Laser Vibrometer ◽  
Sensors And Actuators ◽  
Power Cycles ◽  
Piezoelectric Energy ◽  
Mathematical Equations ◽  
Micropower Generators

Piezoelectric elements can be used as sensors and actuators in flexible structures. In this paper, using the most basic concepts of piezoelectric micropower generators, all useful mathematical equations for getting analytical output are discussed and derived for different piezo positions on cantilever beam and then 3D finite element modeling and simulation of generalized piezoelectric laminated beam problem with proper specifications and properties are done in ANSYS12.0. Experimental analysis is also done on the very practical problem to harvest energy (to get electric energy) by applying some deflection (mechanical energy) on piezo-bonded aluminum beam, that is, to harvest energy (at microlevel at least) by using vibrations of 4-stroke car diesel engine with mounting of piezo cantilever beam. Here piezoelectric beam is used to measure the charge generated from the engine vibrations. The vibration amplitudes are measured with a Laser Vibrometer with considerations of maximum number of power cycles is to be covered for analysis. The vibration response data of displacement of the cantilever at free end measured from Vibrometer are considered for harmonic and analytical analyses as mean displacement amplitude of 3.98 mm at free end. The study further carried out for effect of different piezo positions and various engine speeds also. Then comparison is also done among obtained results from these three analyses to get validation of all derived mathematical equations.

scholarly journals Possibilities of Energy Harvesting from the Suspension System of the Internal Combustion Engine in a Vehicle

2021 ◽  
Vol 23 (2) ◽  
pp. B106-B116
Author(s):  
Jacek Caban ◽  
Grzegorz Litak ◽  
Bartłomiej Ambrożkiewicz ◽  
Leszek Gardyński ◽  
Paweł Stączek ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Power Supply ◽  
Fossil Fuels ◽  
Combustion Engine ◽  
Electric Energy ◽  
Elastic Beam ◽  
Experimental Tests ◽  
Suspension System ◽  
Piezoelectric Energy ◽  
Mechanic Energy

The automotive industry faces huge challenge in environmental protection by reducing fossil fuels and energy consumption by developing various practical solutions in energy harvesting. The current analysis is related to the diesel engine power supply system in a passenger off-road vehicle for application of the piezoelectric energy harvesting system. Experimental tests were carried out for the three constant rotational speed values - 800, 1000 and 1500 rpm. The results pertained to operational and simulation tests of available power supply options from the engine suspension system in the vehicle, e.g. to power sensors supervising the engine’s operation or other small electrical devices in the vehicle. The simulations of output voltage were conducted by means of a nonlinear model with a resonator coupled to a piezoelectric elastic beam deformed in the magnetic field to improve the band of frequency transducing kinetic mechanic energy into electric energy.

Energy harvesting from quasi-static deformations via bilaterally constrained strips

2018 ◽  
Vol 29 (18) ◽  
pp. 3572-3581
Author(s):  
Suihan Liu ◽  
Ali Imani Azad ◽  
Rigoberto Burgueño
Keyword(s):  
Energy Harvesting ◽  
Low Power ◽  
Mechanical Energy ◽  
Electrical Power ◽  
Energy Resource ◽  
Electrical Energy ◽  
Piezoelectric Energy Harvesting ◽  
Power Budget ◽  
Piezoelectric Energy ◽  
Static Conditions

Piezoelectric energy harvesting from ambient vibrations is well studied, but harvesting from quasi-static responses is not yet fully explored. The lack of attention is because quasi-static actions are much slower than the resonance frequency of piezoelectric oscillators to achieve optimal outputs; however, they can be a common mechanical energy resource: from large civil structure deformations to biomechanical motions. The recent advances in bio-micro-electro-mechanical systems and wireless sensor technologies are motivating the study of piezoelectric energy harvesting from quasi-static conditions for low-power budget devices. This article presents a new approach of using quasi-static deformations to generate electrical power through an axially compressed bilaterally constrained strip with an attached piezoelectric layer. A theoretical model was developed to predict the strain distribution of the strip’s buckled configuration for calculating the electrical energy generation. Results from an experimental investigation and finite element simulations are in good agreement with the theoretical study. Test results from a prototyped device showed that a peak output power of 1.33 μW/cm2 was generated, which can adequately provide power supply for low-power budget devices. And a parametric study was also conducted to provide design guidance on selecting the dimensions of a device based on the external embedding structure.

scholarly journals Lightweight Design of Front Suspension Upright of Electric Formula Car Based on Topology Optimization Method

2020 ◽  
Vol 11 (1) ◽  
pp. 15 ◽  
Author(s):  
Jixiong Li ◽  
Jianliang Tan ◽  
Jianbin Dong
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Lightweight Design ◽  
Geometric Model ◽  
Load Condition ◽  
Optimization Method ◽  
Structure Design ◽  
Front Suspension ◽  
Emergency Braking ◽  
Topology Optimization Method

In order to obtain a lightweight front upright of an electric formula car’s suspension, the topology optimization method is used in the front upright structure design. The mathematical model of the lightweight optimization design is constructed, and the geometric model of the initial design of the front upright is subjected to the ultimate load condition. The structural optimization of a front upright resulted in the mass reduction of the upright by 60.43%. The optimized model was simulated and verified regarding the strength, stiffness, and safety factor under three different conditions, namely turning braking, emergency braking, and sharp turning. In the experiment, the uprights were machined and assembled and integrated into the racing suspension. The experimental results showed that the optimized front uprights met the requirements of performance.

Topology Optimization of Piezoelectric Energy Harvesting Devices Subjected to Stochastic Excitation

2010 ◽  
Author(s):  
Zheqi Lin ◽  
Hae Chang Gea ◽  
Shutian Liu
Keyword(s):  
Topology Optimization ◽  
Energy Harvesting ◽  
Electrical Energy ◽  
Ambient Vibration ◽  
Piezoelectric Energy Harvesting ◽  
The Past ◽  
Piezoelectric Energy ◽  
Random Responses ◽  
Pseudo Excitation ◽  
Energy Harvesting Devices

Converting ambient vibration energy into electrical energy using piezoelectric energy harvester has attracted much interest in the past decades. In this paper, topology optimization is applied to design the optimal layout of the piezoelectric energy harvesting devices. The objective function is defined as to maximize the energy harvesting performance over a range of ambient vibration frequencies. Pseudo excitation method (PEM) is applied to analyze structural stationary random responses. Sensitivity analysis is derived by the adjoint method. Numerical examples are presented to demonstrate the validity of the proposed approach.

Mechanistic Modeling and Economic Analysis of Piezoelectric Energy Harvesting Potential in Airport Pavements

2020 ◽  
Vol 2674 (11) ◽  
pp. 64-75
Author(s):  
Jingnan Zhao ◽  
Hao Wang
Keyword(s):  
Energy Harvesting ◽  
Economic Analysis ◽  
Power Output ◽  
Piezoelectric Materials ◽  
Mechanical Energy ◽  
Mechanistic Modeling ◽  
Piezoelectric Energy Harvesting ◽  
Levelized Cost Of Electricity ◽  
Near Surface ◽  
Piezoelectric Energy

This study investigated the feasibility of applying piezoelectric energy harvesting technology in airfield pavements through mechanistic modeling and economic analysis. The energy harvesting performance of piezoelectric transducers was evaluated based on mechanical energy induced by multi-wheel aircraft loading on flexible airfield pavements. A three-dimensional finite element model was used to estimate the stress pulse and magnitude under moving aircraft tire loading. A stack piezoelectric transducer design was used to estimate the power output of a piezoelectric harvester embedded at different locations and depths in the pavement. The aircraft load and speed were found to be vital factors affecting the power output, along with the installation depth and horizontal locations of the energy harvester. On the other hand, the installation of the energy module had a negligible influence on the horizontal tensile strains at the bottom of the asphalt layer and compressive strains on the top of the subgrade. However, the near-surface pavement strains increased when the edge ribs of the tire were loaded on the energy module. Feasibility analysis results showed that the calculated levelized cost of electricity was high in general, although it varies depending on the airport traffic levels and the service life of the energy module. With the development of piezoelectric materials and technology, further evaluation of energy harvesting applications at airports needs to be conducted.

Electromechanical Modeling of Energy Harvesting From the Motion of Left Ventricle in Closed Chest Environment

2016 ◽  
Vol 83 (6) ◽  
Author(s):  
Yangyang Zhang ◽  
Yisheng Chen ◽  
Bingwei Lu ◽  
Chaofeng Lü ◽  
Xue Feng
Keyword(s):  
Energy Harvesting ◽  
Left Ventricle ◽  
Mechanical Energy ◽  
Scaling Law ◽  
Periodic Variation ◽  
Closed Chest ◽  
Numerical Predictions ◽  
Piezoelectric Energy ◽  
Battery Energy

A piezoelectric mechanical energy harvesting (MEH) technique was recently demonstrated through in vivo experiment by harvesting energy from the motion of porcine left ventricle (LV) myocardial wall. This provides a new strategy of energy supply for operating implantable biomedical devices so as to avoid various shortcomings associated with battery energy. This paper resorts to an analytical electromechanical model for evaluating the efficiency of the piezoelectric MEH device especially of that used in closed chest environment. A nonlinear compressive spring model is proposed to account for the impeding effect of surrounding tissues on the device. Inputting the periodic variation of the LV volume as a loading condition to the device, numerical predictions for the electric outputs are obtained and compare well with experiments. A simple scaling law for the output electric power is established in terms of combined material, geometrical, circuit, and LV motion parameters. The results presented here may provide guidelines for the design of in vivo piezoelectric energy harvesting from motions of biological organs.

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