Monitoring Mechanical Vibration Amplitude System Design Based on the PVDF Piezoelectric Film Sensor

2014 ◽  
Vol 556-562 ◽  
pp. 2110-2113 ◽  
Author(s):  
Jia Lin Zhu ◽  
Li Li
Keyword(s):  
Measurement System ◽  
Vibration Amplitude ◽  
Simple Structure ◽  
Mechanical Vibration ◽  
Test System ◽  
Vibration Monitoring ◽  
Piezoelectric Film ◽  
Film Sensor ◽  
Data Acquisition And Processing ◽  
Amplitude System

Vibration monitoring of machinery and equipment plays a very important role in judging the equipment maintenance and operational status. This paper discussed the mechanical vibration amplitude measurement system scheme based on PVDF piezoelectric sensors. The entire test system is mainly composed of PVDF piezoelectric film sensors, charge amplifiers, data acquisition and processing and display of valid values. It can display the amplitude of vibration signals in real time and alarm. The measurement system has the advantages of a simple structure and convenient operation.

Measurement system of swallowing motion by using a piezoelectric film sensor

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1173-1182
Author(s):  
Yusuke Kurishima ◽  
Hirokazu Hashimoto ◽  
Takeshi Okuyama ◽  
Mami Tanaka
Keyword(s):  
Spectral Density ◽  
Measurement System ◽  
Surface Deformation ◽  
The Body ◽  
Digastric Muscle ◽  
Piezoelectric Film ◽  
Sensitive Material ◽  
Film Sensor ◽  
Skin Deformation ◽  
Frequency Components

In this paper, a measurement system of swallowing motion is developed. A piezoelectric film is used as sensitive material of the sensor to measure the body surface deformation due to swallowing. We focused on laryngeal prominence and digastric muscle which are active during swallowing and developed sensors to attach to skin above laryngeal prominence and digastric muscle. As a result of experiments, it was confirmed that output fluctuation occurred at the swallowing. Next, by comparing the frequency spectral density distribution of sensor outputs during swallowing and resting, it was found that the output waveform during swallowing is mainly composed of larger frequency components below 20 [Hz] than that during resting. From the results, it was suggested that the developed measurement system is available to detect the swallowing from skin deformation without obstructing the motion.

scholarly journals Measurement Method for Fluid Pressure Fluctuation in Fluid-Conveying Pipe Using PVDF Piezoelectric Film Sensor

2021 ◽  
Vol 11 (3) ◽  
pp. 1299
Author(s):  
Song Liu ◽  
Xianmei Wu ◽  
Yuanyuan Kong ◽  
Xiuqian Peng
Keyword(s):  
Flow Velocity ◽  
Pressure Fluctuation ◽  
Pipe Wall ◽  
Mechanical Vibration ◽  
Fluid Pressure ◽  
Circumferential Stress ◽  
Stress And Strain ◽  
Piezoelectric Film ◽  
Film Sensor ◽  
Internal Fluid

As a representative fluid-transporting system, fluid-conveying pipes play an essential role in many fields. For a fluid-conveying pipe system in operation, fluid pulsation in pipes contains much information about fluid flow parameters (flow velocity, fluid pressure, etc.). Therefore, the measurement of fluid pulsation is important for understanding the internal fluid flow. To use polyvinylidene fluoride (PVDF) piezoelectric film sensors to indirectly measure the pressure fluctuation of the internal fluid, we simulated a fluid-conveying pipe with PVDF piezoelectric film sensors attached to the outer pipe wall. The simulation results showed that the variation of voltage signal of PVDF, circumferential stress and strain of the pipe wall, and the pressure fluctuation of internal fluid were highly positively correlated, which proved that the PVDF piezoelectric film sensor can be applied to indirectly measure the pressure fluctuation of internal fluid. We also studied the influences of flow velocity pulsation and mechanical vibration caused by the pipeline pump during operation. It is found that the flow velocity pulsation had little influence on the measurements of the variation of circumferential stress and strain of the pipe wall and the internal fluid pressure fluctuation. When both ends of the pipe were fixed by hoops, mechanical vibration had little influence on the measurement of the variation of circumferential stress and strain of the pipe wall as well as the fluid pressure fluctuation. Finally, simulation results were verified by experiments.

Research on a Test Method of Dynamic Force of Jet Elements

2014 ◽  
Vol 574 ◽  
pp. 154-159 ◽  
Author(s):  
Zhong Yang ◽  
Xiao Xian Yao ◽  
Dong Xu Zhang
Keyword(s):  
Delay Time ◽  
Simple Structure ◽  
Mathematic Model ◽  
Test System ◽  
Processing Method ◽  
Test Method ◽  
Dynamic Force ◽  
Simple Method ◽  
Pendulum Test ◽  
Testing Condition

According to the characteristics of the dynamic force of jet elements, a kind of simple pendulum test system was presented. The dynamic jet force value was obtained indirectly by the acceleration value of the jet element under its force. The mathematic model of the test system was established and the test errors of the amplitude and delay time were analyzed. A processing method of dynamic force test data was presented based on the test curve and the parameters of amplitude and delay time were obtained. The result indicates that the test method can satisfy the testing requirements of dynamic force and it has advantages of simple structure, low demands of testing condition and simple method of data processing.

A Degradation Measurement System for Polymer Electrolyte Membrane Fuel Cells Using a Dead-Ended Passive Stack and Time-Varying Load

2011 ◽  
Vol 8 (3) ◽  
Author(s):  
Noboru Katayama ◽  
Sumio Kogoshi
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Measurement System ◽  
Single Cells ◽  
Polymer Electrolyte Membrane ◽  
Test System ◽  
Time Varying ◽  
Electrolyte Membrane ◽  
Degradation Rates ◽  
Degradation Measurement

A degradation measurement system has been developed for polymer electrolyte membrane fuel cells to reveal the relationship between degradation rates and electric load variations. The system involves a dead-ended stack of 10 single cells and an electronic load device that functions as a time-varying load to each cell of the stack. Use of a stack enables the temperatures of the cells to be kept almost the same and the supplied gas conditions to be constant. Experiments were conducted to evaluate the feasibility of this test system. The polarization curves of the multiple cells were simultaneously measured, and the load of each cell in the stack can be individually controlled. Therefore, this system could be applied to reduce the time and cost in measuring the degradation and lifespan of polymer electrolyte membrane fuel cells.

Real Time Acoustic Imaging by Holographic Interferometry

1980 ◽  
Vol 2 (4) ◽  
pp. 313-323 ◽  
Author(s):  
Amin Hanafy ◽  
Mauro Zambuto
Keyword(s):  
Real Time ◽  
Holographic Interferometry ◽  
Vibration Amplitude ◽  
Imaging System ◽  
Mechanical Vibration ◽  
Visual Image ◽  
Acoustic Imaging ◽  
Acoustic Image ◽  
Vibration Pattern ◽  
Amplitude Amplification

A two-step real time acoustic imaging system is presented. The system incorporates a novel acoustic image coupler which transfers an acoustical interference pattern from a water-bounded to an air-bounded surface with vibration amplitude amplification. An original technique termed step-biased real time holographic interferometry is used to convert the amplified mechanical vibration pattern, which carries all information about the insonified object, into a visual image with improved sensitivity.

A Kind of Vibration Sensor and Testing System in Electromechanical Equipment Based on Fiber Bragg Grating

2016 ◽  
Vol 693 ◽  
pp. 1300-1307
Author(s):  
Qi Jiang ◽  
Teng Yun Guo
Keyword(s):  
Fiber Bragg Grating ◽  
Monitoring System ◽  
Experimental Analysis ◽  
Mechanical Vibration ◽  
Vibration Sensor ◽  
Vibration Monitoring ◽  
Bragg Grating ◽  
Element Analysis ◽  
Finite Element Analysis Simulation ◽  
Electromechanical Equipment

Mechanical vibration analysis is an important index to measure the running state of the electromechanical equipment. The vibration signals contain the information about the equipment running state. This paper studies and designs the vibration monitoring system based on fiber Bragg grating (FBG). Through the finite element analysis simulation, optimizes the sensor's structure, and uses the labview software to compile the corresponding vibration monitoring analysis software. Finally verifies the detection effect of the monitoring system, through the pulse signal and continuous signal dynamic experimental analysis. The result of the experimental analysis shows: this vibration monitoring system can monitor the vibration information and analyze vibration state effectively. It has the advantages of reducing the temperature interference and lateral disturbance, and detects the vibration of three direction at the same time. So it is feasible to monitor the electromechanical equipment.

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