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Recently, as a automobile becomes more electronic and intelligent, MEMS(Micro Electro Mechanical System) sensors lead the technology and market of automotive sensor by overcome limitation of size, accuracy and reliability of mechanical sensors. Accelerometer, gyro, and pressure sensor are mainly studied MEMS sensor in the automobile field. Specially, intensification of safety regulation has increased the requirement and interest of the accelerometer. There are piezoelectric, piezoresistive, capacitive type in the sensing method of the accelerometer. Among these, piezoelectric method has high sensitivity feature with a simple manufacturing process. In this paper, we fabricated Flexural Plate Wave(FPW) accelerometer which sense frequency change of the vibrating piezoplate and found a optimum condition of the piezoplate shape and manufacturing condition to improve performances by using the design of experiment.

Recently, to enhance passenger comfort, air suspension systems with rubber tube have been replacing conventional coiled spring type suspension in automobile suspension systems. In this study, the optimum design of rubber and cord materials in rubber tube, aimed at improving the performance of the air suspension system, has been studied. To determine the optimum design, the study altered the fillers and antioxidants in CR (chloroprene rubber) compounds with good ozone-resistance properties, and changed the angles and thickness of the nylon cord. The study produced rubber tubes using cord-reinforced rubber composite materials, then analyzed and measured the resultant physical properties, microstructure, and dimensions. It also evaluated the load capacity, static and dynamic spring characteristics, outer diameter changes, and pressure changes in the loading, and determined the burst pressure of air suspension.