Abstract
In this study, piezoelectric based compressive type accelerometer has been de-signed by using PZT-5A ceramics with bellewasher type spring. FEA analysis were carried out by using COMSOL. According to COMSOL simulation, reso-nance frequency is nearly 42500 Hz. Sensitivity of the designed sensors were measured and compared each other. Frequency spectrum was between 100Hz-10 kHz. The effects of piezodisk thickness, stiffness of the spring and seismic mass on the sensitivity of the designed sensor were investigated. Voltage output is in-creasing from 4.1 mV/g to 12.7 mV/g while seismic mass is raised from 3 gr to 10 gr. Linearity depending on the frequency of the designed accelerometer was dis-torted above 5.5 kHz like commercial accelerometer. In addition, real-time tests were performed using a calibrated accelerometer and a designed accelerometer on the internal combustion engine and drivetrain. Vibration profiles were carried out randomly. According to the results obtained here, it is observed that all the peaks were matched with a coefficient about 1.3.
Highlights
Vehicles produced in last 30 years are equipped with sensors to increase safety and driving comfort
If seismic mass of the sensor was increasing to 15 gr, resonance frequency was decreased to 37,5 kHz
Effect of seismic mass 3 gr to 10 gr to the voltage output is shown in figure 4
Summary
Vehicles produced in last 30 years are equipped with sensors to increase safety and driving comfort. These sensors are used to measure or determine changes in vehicles or external conditions by using parameters in magnetic, electrical or chemical values. Automotive applications of acceleration sensors are airbag initiation, Anti-lock braking systems (ABS),electronic stability program (ESP), active suspension systems, hill descent control systems (HDC), monitoring noise or harshness etc [3]. These sensors have sensing material based on MEMS, piezoresistive or piezoelectric [4]. Piezoelectric accelerometers are categorized into three commercial subgroups based on working mechanism; 1) Shear mode 2)Bender mode 3) Compression mode [6]
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