本文旨在設計一連續可調式避震器並且於四分之ㄧ車作半主動式懸吊的控制，連續可調式避震器的主要將阻尼可調變機構裝置於被動式避震器內，經由步進馬達轉動此調變機構，藉以改變調變閥口大小使避震器內液壓油流量改變，而達到阻尼係數的調變。為證明連續可調式避震器的性能，本文架設一實驗台進行實驗驗證其性能。
在四分之ㄧ車半主動懸吊系統上，為了改善車輛乘坐舒適性和操控性，本文分別設計了兩種天鉤阻尼理論及Rakheja and Sankar 法則為基礎的兩種模糊控制器來控制半主動懸吊系統，由實驗結果可知使用兩控制器後在車體震動量以及PSD都可有效減少，而Rakheja and Sankar 法則模糊控制器可以在隨機路面上有較佳的舒適性。

In this paper, a continual adjustable shock absorber was developed to execute the semi-active control of the suspension system of a 1/4 car. The main structure of the adjustable shock absorber includes an adjusting element within a conventional shock absorber. An adjusting element is designed to adjust the damping aperture so that to change the damping coefficient. The adjusting element is embedded in the rod of the shock absorber piston. A stepping motor is applied to drive the adjusting element. It controls the rotation of the adjusting member within a cylinder, thereby adjusting the amount of hydraulic fluid which bypasses the damping passage between two hydraulic chambers and hence achieving the desired damping coefficient. For proving this design, a test experimental setup we built to measure the performance of the continual adjustable shock absorber.

Finnaly, the designed shock absorber is set up to the suspension system of the 1/4 car. To improve the riding comfort and driving quality, two fuzzy controllers based on skyhook method and Rakheja -Sankar method are designed to control the semi-active suspension system, individually. The experimental results show that both controller can reduce the displacement of car body and PSD. In addition, the Rakheja - Sankar method fuzzy controller can give more driving quality on random road.

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