Design and Testing of Electrorheological Fluid Damper 趙宮志、李春穎
E-mail: [email protected]
ABSTRACT
Intelligent vehicle has become one of the most important research topics for the next generation transportation. Among the related technologies, driving safety and comfort involving the incorporation of active suspension system is the unavoidable option. This thesis focuses on the development of the electrorheological fluid damper, which is the key object for the smart suspension system.
The theoretical formulation of ER fluid flowing through an annular orifice is first studied. The influence of the design variables such as dimensions of the orifice, applied electric field strength, and the property of the ER fluid etc. are investigated. The results of this theoretical modeling with annular orifice are compared with those with parallel-plate orifice. The discrepancy between these two modeling is insignificant for usual case. However, for the flow with large flow rate and small yield stress, the discrepancy of the results between these models enlarges. On the other hand, an experimental study on the pressure drop and the damping force for the electrorheological fluid damper under the operation of different piston velocities and controlled electric field strengths is conducted to verify the accuracy of the proposed model. It is found that with higher electric field, higher piston velocity, smaller electrode gap height and longer electrode length, both the pressure drop across the orifice and damping force increase accordingly. Nevertheless, as the piston velocity increases further, the rate of increment in the pressure drop and damping force becomes smoother. This study demonstrates that the damping force of the electrorheological fluid damper can be effectively tuned via the adjustment of the applied electric field.
Keywords : Intelligent vehicle ; semi-active suspension system ; electrorheological fluid damper Table of Contents
第一章 緒論………... 1 1.1 前言……… 1 1.2 研 究動機……… 3 1.3 文獻回顧……… 4 1.3.1 電流變液簡介
……….. 4 1.3.2 電流變液阻尼器……….. 8 1.4 研究目的………
……… 12 1.5 內容概述……… 13 第二章 研究方法及理論………
………. 15 2.1 研究內容………... 15 2.2 研究之理論模式推導………... 16 2.2.1電流變液流經平行板電極之分析…….…….. 16 2.2.2電流變液流經圓環狀電極流道之分析…….. 23 2.3理論分析結果與 參考文獻上[9]之結果的比較.…… 32 2.4平行板流道與圓環狀流道分析模型之比較….…… 34 2.4.1環形流道曲率半徑之影響
……… 34 2.4.2降伏應力對模型流動特性之影響……… 37 2.4.3流量對模型流動之影響………
42 第三章 系統的實驗量測與結果討論………... 47 3.1電流變液的配製……….… 47 3.2電流變液的流體黏度測試………...….. 48 3.3阻尼器特性量測實驗設備的建構………...….. 53 3.4外加電場 對系統的影響……….………….... 57 3.5活塞的推擠速度對系統的影響………. 59 3.6電極間隙與電極長度 對系統的影響………. 61 3.6.1改變電極間隙的影響……… 62 3.6.2改變電極長度的影響………
………… 64 3.7實驗結果與理論值之比較………. 65 3.7.1外加電場與節流口壓降的關係………... 66 3.7.2外加電場與阻尼力的關係………... 70 第四章 結論………. 73 參考文獻
………. 76 REFERENCES
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