Study on Design of Wide-Band Vibration-Based Piezoelectric Power Generator

学位記番号：理工博甲9

Vibration Energy Regeneration System Using Piezoelectric Sensor for Wideband Application

This paper presents a method for widening bandwidth by using non-uniform mass which use the concept of center of gravity. Piezoelectric acts as a tool to convert vibration energy to electrical energy. The displacement from the liquid movement plays a role to enhance the bandwidth as the beam bends. The bandwidth is widened 2 times higher compared without tip mass and 1.6 times increased than that of solid tip-mass. High viscosity and density will give a greater effect on the bandwidth at low volume compared to low properties of fluid. Rectangular container can resist the tension of liquid due to high viscosity and volume. The fluid-filled mass technique widened the bandwidth without reducing the harvested power

Performance Analysis of Hexagon-Diamond Search Algorithm for Motion Estimation

To achieve a high compression ratio in coding video data, a method known as Motion Estimation (ME) is often applied to reduce the temporal redundancy between successive frames of a video sequence. One of ME techniques, known as Block Matching Algorithm (BMA), has been widely used in various video coding standards. In recent years, many of these BMAs have been developed with similar intention of reducing the computational costs while at the same time maintaining the video signal quality. In this paper, an algorithm called Hexagon-Diamond Search (HDS) is proposed for ME where the algorithm and several fast BMAs, namely Three Step Search (TSS), New Three Step Search (NTSS), Four Step Search (4SS) as well as Diamond Search (DS), are first selected to be implemented onto various type of standard test video sequence using MATLAB before their performances are compared and analyzed in terms of peak signal-to-noise ratio (PSNR), number of search points needed as well as their computational complexity. Simulation results demonstrate that HDS algorithm has speed up other algorithm’s computational work up to 56% on average while at the same time maintains close performance in terms of average PSNR to others

Half Car Active Suspension System

This paper presents a new method in modeling an active suspension system for a half-car model in state space form and develop a robust control strategy in controlling the active suspension system. Fuzzy logic is used to control the system. Velocity and displacement of front wheels are taken as input variables of the fuzzy logic controller. Active forces improving vehicle driving, ride comfort and handling properties are considered to be the controller outputs. The controller design is proposed to minimize chassis and wheels deflection when uneven road surfaces, pavement points, etc. are acting on the tires of running cars. Comparison of performance of active suspension fuzzy control system with passive suspension system is shown using Matlab/Simulink simulation. From the result, it shows that active suspension system has better performance than the passive suspension system

Piezoelectric Energy Harvesting System Via Impact And Vibration – A Review

Recently, the vibrational energy harvesting devices have been studied and developed significantly. Although battery is the main power source for electronic devices, it still has some limitations, particularly its life time. Piezoelectric transducer is one of the devices that can be used for the vibration energy harvesting system. It has higher power density compared to the others. A comprehensive review on piezoelectric energy harvesting system is discussed and presented in this paper. The techniques of the piezoelectric energy harvester such as impact and vibration modes are reviewed. The power generator developed for the impact-based piezoelectric energy harvester is addressed in this paper. It can be concluded that the piezoelectric energy harvesting system can generate output power in the range of 34.6nW to 1.34W

Design and optimization of a wideband impact mode piezoelectric power generator

This paper proposes a new design of an impact mode piezoelectric power generator that is able to operate in a wide frequency bandwidth by using a round piezoelectric ceramic as the energy converter. The evaluation results show that the output of the power generator can be optimized by implementing a so-called indirect impact configuration. To realize this type of configuration, a shim plate is placed between the piezoelectric ceramic and the hitting structure. At a certain base excitation frequency, the output efficiency of this configuration increases to about 4.3 times that of the direct impact configuration. Furthermore, it is demonstrated that the designated power generator is able to generate electric energy up to approximately 1.57 mJ within 120 s from the vibration of a moving vehicle

Collated Studies on Rectifying Circuit on Impact-Based Piezoelectric Energy Harvesting

Nowadays, energy consumption for ultra-low power energy such as piezoelectric energy harvester has suffered a very huge power loss when rectifying the generated AC signal into regulated DC voltage. This paper presents a method on enhancing the efficiency of the proposed rectifier circuit on Lead Zirconate Titanate (PZT) piezoelectric disk. The experiment was conducted by actuating the transducer by applying one single impact pulse only from a weight-drop test setup. The aim of this study is to increase the efficiency of the extracted output power from piezoelectric by reducing the power losses during the rectification process. Enhancements were made by identifying factors affecting the generated output power from the transducer. Four different types of rectifier topologies were studied and optimized by varying the level of forward voltage drop, Vf across the diode. The enhancement of the generated output voltage from the harvester was also conducted by altering and specifically designed the mechanical configuration of the disk’s supporting base in order to increase the displacement of the piezoelectric strain. The system performances have been analyzed and the resulted data have been plotted into voltage and power curves against the resistive impedance. It was found that the power efficiency of full-wave bridge rectifier constructed with the lowest Vf, is the highest compared to the half-wave and the specialized voltage doubler rectifier

Effect of circular coil dimension on resonant coupling wireless power transfer system

A wireless power transfer system based on the resonant inductive coupling circuit with an additional short-range distance detection was carried out. The hardware-implemented system can be divided into four components, namely the circular coils, transmitter and receiver circuits for power transmission and microcontroller-based distance detector for the monitoring system. As the resonating capacitor is constant (1 F), different sets of inductive coils for the antenna of transmitter and receiver circuits depending on a number of turns (N) and diameter (D) were fabricated. The effect of circular loop resonant coil diameter was investigated on the output voltage and resonant frequency. The system is capable of transferring electrical energy with the maximum output voltage (VOUT) at the receiver circuits is 27.3 V. The maximum gap distance between the transmitter and receiver coils is 10 cm, corresponding to the VOUT of 4.4 V. Other than that, the maximum output power transfer (PMAX) at the receiver circuit is 15.6 W. In addition, a short-range distance detection system using an Arduino MEGA microcontroller was built to automatically monitor the output voltage with respect to the air gap distance

Development Of Home Appliances Controller With DTMF Signal

This paper presents the development of home appliances controller design that utilizes Dual-Tone Multi Frequency (DTMF) signal from the landline telephone. The device contains microcontroller that links with a decoder IC that converts DTMF signal into binary codes and vice versa. It is proven that the device enables residents to send and receive signal from outside the house; thus enabling them to control the appliances at home. Finally, the results from an experimental setup found that the device is proven to be working