scholarly journals Automated tuning of a piezoelectric power harvesting cantilever beam via the application of an axial load

2021 ◽  
Author(s):  
Kenneth See Jin Tam
Keyword(s):  
Cantilever Beam ◽  
Axial Load ◽  
Closed Loop ◽  
Axial Loading ◽  
Automatic Tuning ◽  
Power Harvesting ◽  
Piezoelectric Beam ◽  
Piezoelectric Cantilever ◽  
Loop Tuning ◽  
Automated Tuning

This thesis deals with automatic tuning of piezoelectric power harvesters. A prototype was constructed to verify the effect of the application of an axial load on a cantilever beam and the effectiveness of increasing the power harvested from a piezoelectric beam via axial loading. It was shown, experimentally, that the natural frequency of a piezoelectric beam harvester can be changed over a range of 25Hz. From the experimental results it was shown that the power can increase up to seven times when tuned in comparison to unturned. Computer simulations were used to demonstrate a closed loop tuning system’s ability to apply an axial load effectively onto a piezoelectric cantilever beam in response to ambient vibrations. The closed loop tuning system is a viable option for tuning and can lead to increased power when applying the axial load suggested by the tuning system.

scholarly journals Automated tuning of a piezoelectric power harvesting cantilever beam via the application of an axial load

2021 ◽  
Author(s):  
Kenneth See Jin Tam
Keyword(s):  
Cantilever Beam ◽  
Axial Load ◽  
Closed Loop ◽  
Axial Loading ◽  
Automatic Tuning ◽  
Power Harvesting ◽  
Piezoelectric Beam ◽  
Piezoelectric Cantilever ◽  
Loop Tuning ◽  
Automated Tuning

This thesis deals with automatic tuning of piezoelectric power harvesters. A prototype was constructed to verify the effect of the application of an axial load on a cantilever beam and the effectiveness of increasing the power harvested from a piezoelectric beam via axial loading. It was shown, experimentally, that the natural frequency of a piezoelectric beam harvester can be changed over a range of 25Hz. From the experimental results it was shown that the power can increase up to seven times when tuned in comparison to unturned. Computer simulations were used to demonstrate a closed loop tuning system’s ability to apply an axial load effectively onto a piezoelectric cantilever beam in response to ambient vibrations. The closed loop tuning system is a viable option for tuning and can lead to increased power when applying the axial load suggested by the tuning system.

Experimental Study on Nonlinear Vibration of Bistable Piezoelectric Cantilever Beam

2015 ◽  
Vol 775 ◽  
pp. 363-367 ◽  
Author(s):  
Yin Bo Li ◽  
Ming Hui Yao ◽  
Wei Zhang
Keyword(s):  
Dynamic Behavior ◽  
Cantilever Beam ◽  
Period Doubling ◽  
Experimental Results ◽  
Dynamic Responses ◽  
Harmonic Load ◽  
Jump Phenomenon ◽  
Piezoelectric Beam ◽  
Optimal Distance ◽  
Piezoelectric Cantilever

This article focuses on the complicated dynamics behavior of the nonlinear vibrations of the bistable cantilevered piezoelectric beam. The base excitation on the beam is the harmonic load. We studied the jump phenomenon of the system by sweeping the voltage and displacement, the experimental results show that the bistable piezoelectric cantilever beam reflects the obvious hard spring characteristics. In addition, the influence of the distance between the magnets and the thickness of the piezoelectric layer on the dynamic behavior also being studied. Experimental results show that the distance between the magnets is closely impact on the nonlinear dynamic responses of the system, there is an optimal distance between the magnets causes the most complex dynamic behavior in frequency domain. System appears period doubling bifurcation into chaos many times when the distance between magnets is appropriate.

scholarly journals Analysis of a Cantilevered Piezoelectric Energy Harvester in Different Orientations for Rotational Motion

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1206 ◽  
Author(s):  
Wei-Jiun Su ◽  
Jia-Han Lin ◽  
Wei-Chang Li
Keyword(s):  
Theoretical Model ◽  
Resonant Frequency ◽  
Rotational Motion ◽  
Axial Load ◽  
Energy Harvester ◽  
Excitation Frequency ◽  
Experimental Studies ◽  
Piezoelectric Energy ◽  
Piezoelectric Cantilever ◽  
Tip Mass

This paper investigates a piezoelectric energy harvester that consists of a piezoelectric cantilever and a tip mass for horizontal rotational motion. Rotational motion results in centrifugal force, which causes the axial load on the beam and alters the resonant frequency of the system. The piezoelectric energy harvester is installed on a rotational hub in three orientations—inward, outward, and tilted configurations—to examine their influence on the performance of the harvester. The theoretical model of the piezoelectric energy harvester is developed to explain the dynamics of the system and experiments are conducted to validate the model. Theoretical and experimental studies are presented with various tilt angles and distances between the harvester and the rotating center. The results show that the installation distance and the tilt angle can be used to adjust the resonant frequency of the system to match the excitation frequency.

Vibration of Beams with a Single Delamination under Axial Loading

2011 ◽  
Vol 675-677 ◽  
pp. 477-480
Author(s):  
Dong Wei Shu
Keyword(s):  
Free Vibration ◽  
Natural Frequency ◽  
Analytical Solutions ◽  
Axial Load ◽  
Natural Frequencies ◽  
Axial Loading ◽  
Composite Beams ◽  
Mode Shapes ◽  
Equilibrium Conditions ◽  
Monotonic Relation

In this work analytical solutions are developed to study the free vibration of composite beams under axial loading. The beam with a single delamination is modeled as four interconnected Euler-Bernoulli beams using the delamination as their boundary. The continuity and the equilibrium conditions are satisfied between the adjoining beams. The studies show that the sizes and the locations of the delaminations significantly influence the natural frequencies and mode shapes of the beam. A monotonic relation between the natural frequency and the axial load is predicted.

scholarly journals A Preliminary Study on the IoT-Based Pavement Monitoring Platform Based on the Piezoelectric-Cantilever-Beam Powered Sensor

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Yue Hou ◽  
Linbing Wang ◽  
Dawei Wang ◽  
Hailu Yang ◽  
Meng Guo ◽  
...  
Keyword(s):  
Cantilever Beam ◽  
Vibrational Energy ◽  
Acceleration Sensor ◽  
Piezoelectric Energy ◽  
Piezoelectric Cantilever ◽  
Pavement Monitoring ◽  
Preliminary Study ◽  
Operation Cycle ◽  
Infrastructure Health ◽  
Monitoring Platform

Green and sustainable power supply for sensors in pavement monitoring system has attracted attentions of civil engineers recently. In this paper, the piezoelectric energy harvesting technology is used to provide the power for the acceleration sensor and Radio Frequency (RF) communication. The developed piezoelectric bimorph cantilever beam is used for collecting the vibrational energy. The energy collection circuit is used to charge the battery, where the power can achieve 1.68 mW and can meet the power need of acceleration sensor for data collection and transmission in one operation cycle, that is, 32.8 seconds. Based on the piezoelectric-cantilever-beam powered sensor, the preliminary study on the IoT-based pavement monitoring platform is suggested, which provides a new applicable approach for civil infrastructure health monitoring.

Performance Analysis for a Wave Energy Harvester of Piezoelectric Cantilever Beam

2019 ◽  
Vol 83 (sp1) ◽  
pp. 976
Author(s):  
Ming Liu ◽  
Hengxu Liu ◽  
Hailong Chen ◽  
Yuanchao Chai ◽  
Liquan Wang
Keyword(s):  
Performance Analysis ◽  
Cantilever Beam ◽  
Wave Energy ◽  
Energy Harvester ◽  
Piezoelectric Cantilever
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