scholarly journals Smart Seat

2021 ◽  
Vol 9 (12) ◽  
pp. 2263-2265
Author(s):  
Swagata Banerjee
Keyword(s):  
Piezoelectric Material ◽  
Piezoelectric Effect ◽  
Piezoelectric Sensor ◽  
Electrical Charge ◽  
Rechargeable Battery ◽  
Temperature Strain

Abstract: Smart Seat: When a person seats on a seat, certain amount of pressure is applied on it. If we install certain amount of piezoelectric sensor in a seat. With the help of pressure, we can generate voltage. Piezoelectric sensor is a device that uses the piezoelectric effect, to measure changes in pressure, acceleration, temperature, strain, or force by converting them to an electrical charge. Using the sensor under the seat the pressure generated by a person seated on a chair can be sensed by sensor and generate electricity. Mainly piezoelectric material that can generate a voltage proportional to the stress applied upon it. This paper is based around this process. There will be springs attached under the seat also. When pressure is applied on the spring there will be equal pressure applied on a sensor which is attached in the bottom of every spring. With this we can generate a considerable amount of voltage to use it in future by storing it in a rechargeable battery. If the pressure is more applied on the sensor, then we can generate more voltage through the process. Keywords: Sensor, Battery, Piezoelectric, Seat, pressure.

Investigation of crack repair using piezoelectric material under thermo-mechanical loading

2020 ◽  
Vol 31 (19) ◽  
pp. 2243-2260
Author(s):  
Ritesh Kumar ◽  
Akhilendra Singh ◽  
Mayank Tiwari
Keyword(s):  
Piezoelectric Material ◽  
Mechanical Loading ◽  
Mechanical Load ◽  
Piezoelectric Sensor ◽  
Crack Location ◽  
Piezoelectric Patch ◽  
Optimal Value ◽  
Temperature Environment ◽  
Crack Repair ◽  
Cyclic Mechanical Load

This article presents an experimental investigation of repair of a crack in a structure using piezoelectric material under thermo-mechanical loading environment. The cyclic mechanical load is applied on a plate with a straight and angular crack under uniform temperature environment. Two cases have been considered for the repair of crack under (a) mechanical loading and (b) thermo-mechanical loading environment. A piezoelectric sensor is utilized to measure voltage. The measured voltage is used to calculate the stress intensity factor in passive and active modes. The effect of a single and double piezoelectric patch in the repair of the plate is investigated. The double piezoelectric patch is found to be more effective as compared to single patch when placed symmetrically offset from the crack. An optimal value of voltage and phase difference is evaluated for most effective crack repair. Location of the piezoelectric patch is varied with respect to crack location, and best-suited position for effective crack repair is proposed. The viability of piezoelectric used for repair under thermo-mechanical loading is discussed. The active mode of repair by piezoelectric is found to be effective under thermo-mechanical loading environment.

Design and Fabrication of a Piezoelectric Sensor for Weighing in Motion

2011 ◽  
Vol 483 ◽  
pp. 154-157 ◽  
Author(s):  
Li Bo Zhao ◽  
Jian Qiang Liang ◽  
Yu Long Zhao ◽  
Jian Zhu Wang ◽  
Wei Chen ◽  
...  
Keyword(s):  
Rise Time ◽  
Quartz Crystal ◽  
Piezoelectric Effect ◽  
Dynamic Test ◽  
Piezoelectric Sensor ◽  
Experimental Results ◽  
Step Response ◽  
Load Carrying ◽  
Length Direction ◽  
The Cost

Based on piezoelectric effect of quartz crystal, a piezoelectric sensor with the range of 150 kN has been developed for weighing in motion (WIM).The sensor consists of the sensitive elements and load-carrying beam. In order to decrease the cost and difficulty of processing of the load-carrying beam, separate structure of the load-carrying beam is designed with series bolts. Moreover, the preload on the sensitive elements can be adjust by the bolts, thus the sensitivity of the sensor also can be adjust and calibrated conveniently. The experimental results show the sensitivity of the sensor is about 1.32 PC/N, and the non-compliance of output along the length direction is less than 3.75%. The dynamic test shows the rise time of the step response is less than 0.1 ms that meet the requirement of WIM.

Design and Simulation of MEMS Sensor for Detection of Arterial Pulse

2018 ◽  
Vol 17 (2) ◽  
pp. 7247-7260
Author(s):  
Sonali Navghare
Keyword(s):  
Piezoelectric Effect ◽  
Biomedical Application ◽  
Applied Pressure ◽  
Electrical Potential ◽  
Fem Analysis ◽  
Piezoelectric Sensor ◽  
Micro Electro Mechanical System ◽  
Arterial Pulse ◽  
Mems Sensor ◽  
Circular Diaphragm

The work presented in this paper describe the design and simulation of a MEMS (Micro Electro Mechanical System) system based piezoelectric sensor for detecting arterial pulse in biomedical application. The study is done through the analysis of square and circular diaphragm made out of piezoelectric and MEMS material. In this work, piezoelectric material is used which work on the principle of piezoelectric effect. In piezoelectric effect, diaphragm reorients under stress, form an internal polarization which result in crystal charge on the crystal face that is proportional to applied pressure. When pressure is applied on diaphragm deformation occurs which converts physical energy into output electrical voltage. For selecting the appropriate geometry and material for sensor design different parameter were checked such as deformation, output voltage, Stress and linearity. FEM analysis is done for circular and square diaphragm on COMSOL Multi-Physics. Comparison of square and circular diaphragm is done on the basis of deformation and Electrical potential. Piezoelectric sensor is designed and simulated with lithium-Niobate and poly-si. Sensitivity obtained for the designed sensor is about 4mV/Kpa.

Stress Optimization of a Piezoelectric-Controlled Curved Beam

2012 ◽  
Author(s):  
Van Vo ◽  
Amit Maha ◽  
Su-Seng Pang
Keyword(s):  
Piezoelectric Material ◽  
High Pressures ◽  
Piezoelectric Effect ◽  
Optimal Placement ◽  
Curved Beam ◽  
Thermal Changes ◽  
Two Factors ◽  
Stress Optimization ◽  
Dynamic Warping

A composite curved beam is used to represent a multitude of structures in piping, such as O-Rings, that undergo dynamic warping as a result of long term usage, thermal changes, and high pressures. A piezoelectric material can be used to design an auto-corrective process that senses the dynamic warping and induces forces to restore the shape through the Piezoelectric Effect. The orientation and placement of the piezoelectric material on a composite curved beam directly affects the deflection and stress applied to that beam. The optimal placement of the actuator in terms of these two factors was researched.

Research on Dynamics Measurement of Piezoelectric Sensor Based on PVDF Films

2014 ◽  
Vol 496-500 ◽  
pp. 1473-1476
Author(s):  
Qi Zhang ◽  
Ying Jun Li ◽  
Gui Cong Wang ◽  
Ru Jian Ma ◽  
Xiu Yun Zhao
Keyword(s):  
Mathematical Models ◽  
Natural Frequency ◽  
Piezoelectric Effect ◽  
Theoretical Calculations ◽  
Piezoelectric Sensor ◽  
Dynamic Measurements ◽  
Support Structure ◽  
Calculating Method ◽  
New Type ◽  
Lower Cover

A new type of upper and lower cover support structure piezoelectric sensor based on PVDF films is designed in terms of piezoelectric effect. Mechanics and mathematical models are established according to the structure of the sensor. The natural frequency of the sensor is derived finally. The natural frequency of the sensor is verified to meet the requirements of dynamic measurements by using theoretical calculations and simulations. The effectiveness of the calculating method is indicated.

Influence of DC Bias on the Properties of the Piezoelectric Material

2016 ◽  
Vol 852 ◽  
pp. 164-170
Author(s):  
Kang Le ◽  
Yu Jun Feng
Keyword(s):  
Dielectric Constant ◽  
Elastic Constant ◽  
Piezoelectric Material ◽  
Bias Voltage ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Resonance Method ◽  
Impedance Spectrum ◽  
Impedance Analyzer ◽  
Dc Bias

According to the resonant characteristics of piezoelectric materials, in order to get the parameters of piezoelectric materials under DC bias voltage by calculate the impedance spectrum of piezoelectric materials, and the changes of the parameters of piezoelectric materials under DC bias were discussed. This paper measured the impedance spectrum of piezoelectric materials under different DC bias voltage with TH2828S Impedance Analyzer, and found that DC bias voltage made the material impedance spectrum drifted. Various parameters of materials were calculated by the resonance method, it was found that the parameters of piezoelectric materials under varied bias voltage were different, and the behaviours of each parameters under DC bias voltage were obtained.It was consider that the elastic constant and dielectric constant were changed due to the inverse piezoelectric effect of the piezoelectric materials which were under DC bias voltage,so that other parameters were changed.Then the resonant frequent formula of piezoelectric materials under DC bias voltage was deduced.

Active vibration control in human forearm model using paired piezoelectric sensor and actuator

2020 ◽  
pp. 107754632095753
Author(s):  
Seyedeh Marzieh Hosseini ◽  
Hamed Kalhori ◽  
Adel Al-Jumaily
Keyword(s):  
Dielectric Constant ◽  
Control System ◽  
Vibration Control ◽  
Piezoelectric Material ◽  
Active Vibration Control ◽  
Piezoelectric Sensor ◽  
Control Gain ◽  
Tremor Suppression ◽  
Human Forearm ◽  
Active Vibration

An active vibration control system to monitor and suppress the human forearm tremor is proposed in this article. The forearm is modelled as a uniform flexible continuous beam supported by a pin joint and a rotational spring at one end, whereas the other end is free. The beam is covered with a layer of piezoelectric sensor on its top surface and a layer of piezoelectric actuator on its bottom surface to form a control system, through which a closed-loop active control paradigm is implemented for tremor suppression. The governing equation of motion is derived using the Hamilton principle as well as the Galerkin procedure, leading to a second-order ordinary differential equation in time. The vibration response of the structure to an external harmonic excitation, analogous to tremor, is obtained analytically, enabling parametric study of the control system for tremor reduction. Using the obtained analytical expression, the effects of various parameters such as the control gain, the piezoelectric coefficient and the dielectric constant on the vibration response are studied. The results indicated that the proposed active vibration control system is an effective tool for active vibration control. Increasing the control gain of the control system as well as the magnitude of the piezoelectric constant decreased the amplitude of vibration, whereas the dielectric constant of the piezoelectric material did not show to have a significant effect on the beam vibration. The obtained results will pave the way for further experimental exploration to take and fabricate the most appropriate piezoelectric material and to design an effective active vibration control system for tremor suppression in people with Parkinson’s disease.

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