Browsing by Author "Zine Ghemari"

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    Modeling and Enhancement of Piezoelectric Accelerometer Relative Sensitivity
    (Université de M'sila, 2019) Salima Khaoula Reguieg; Zine Ghemari; Tarak Benslimane; Salah Saad
    The piezoelectric accelerometer is an electronic instrument based on the direct effect of the piezoelectric material, this device is widely used in the industries to monitor and detect defects of rotating machines in an early stage. In this paper, a thorough study of the piezoelectric accelerometer is carried out to understand its design and operation principle. A mathematical model of the accelerometer is developed based on Newton motion law then a new relative sensitivity equation in function of measurement error is extracted. This new equation has allowed a significant reduction in the measurement error, a maximum improvement in the precision and an optimization of the piezoelectric accelerometer relative sensitivity by the appropriate choice of damping rate. These improvements have optimized the accelerometer parameters and performances.
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    ItemOpen Access
    A NOVEL TECHNIQUE BASED ON IoT ACCELEROMETER FOR TRANSMITTING CIRCULAR CHART RECORDERS TO ELECTRICAL DATA
    (2022) Mohamed Razi Morakchi; Zine Ghemari; Mabrouk Defdaf; Selman Djeffal; Nacer Belhout
    The omnipresence of the Internet of Things (IoT)-based accelerom eter in the industry has been considered as an alternative to paper chart recorder yet it is unprecedentedly tested on pressure recording variation. To this end, this paper contributes to the improvement of data acquisition which is obtained from pressure chart recorders through accelerometer de vices. Firstly, the accelerometer device is thoroughly described. Then, the implementation of the accelerometer and IoT based accelerometers in a va riety of domains is discussed. Secondly, the used materials to carry out the bench test are presented, namely accelerometer, ADXL345, H3LIS331DL, Barton , DEWEIT pressure chart recorder, Raspberry pi and Arduino. The aforementioned devices are purposefully coupled, explicitly two types of ac celerometers are plugged into the raspberry pi for the sake of comparing the accuracy of transmitting mechanical to electronic charts. Finally, it is found that the accelerometers combined with wireless communication can offer a reliable alternative for expensive tasks. In addition, it perfectly facilitates data acquisition from a pressure chart recorder which is considered the first integration of an accelerometer in a pressure chart recorder. Interestingly, the H3LIS331DL accelerometer is way better than ADXL345 when it comes to processing high-pressure variation more than 3900 PSI within few sec onds. It is noteworthy to say that the proposed IoT-based accelerometer to assess the pressure variation in industry is considered for the first time as an electrical chart recorder