Parametric Study of Ultrasonic Pulses Type Park Distance Sensors

Goh, Tong Tai (2018) Parametric Study of Ultrasonic Pulses Type Park Distance Sensors. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

This paper discuss the possible factor that will affect the maximum detectable distance of an ultrasonic distance sensor. Due to the advancement of the automotive technology, several types of parking assistance technology has been developed. The most common type of car park sensor is ultrasonic pulse type. Ultrasonic sensor apply the time of flight principle to estimate the distance between the vehicle rear bumper and the obstacles. However, due to the geometry of the obstacles, the sensor has failed to detect it thus it fail to alert the driver. The geometry of the obstacles fail to reflect the echo back to the transducer. As a result, accident may happen and cause damage to the driver or the vehicle. The objective of this proposal is to investigate the effect of the geometry and the material of the object towards the performance of the sensor. Besides that, the parametric study on the sensor will be carry out to study the performance of the ultrasonic sensor. The analysis of the sensor are done by simulation software which is ANSYS Transient-Acoustic simulation. 15C73-TK012L3 are used as the base line model of the ultrasonic sensor. The parameters of the sensor included the frequency of the ultrasonic sensor, distance between the ultrasonic sensor and the obstacle, obstacle shape and obstacle material. The simulation result of this study are presented and the acoustic pressure contour are displayed to study the effect toward the echo. The higher the frequency of the ultrasonic sensor, the shorter the maximum detectable distance. Other than that, Square shaped obstacle has a best detectability, which is 7.92 meters, compared to thick rod, thin rod and triangle shape. Also, Aluminium has a better detectability, which is 6.68 meters, following by concrete and clothing material. Besides that, the higher the environment temperature, the faster the sensor to receive and echo. Finally, the result suggest that the proposed method can be a great interest of different sensor application in different area.