The feasibility of electrorheological (ER) dampers for an automotive semi-active suspension was evaluated in a three phase programm. In the first phase, ER fluid performance targets were derived. The desired right and handling attributes of the suspension system were translated into damper specifications, which were then translated into the ER fluid performance targets. The damper specifications included dynamic range, bandwidth, power draw, and packaging. The ER fluid performance parameters then included zero-field viscosity, ER stress, response time, and power density. In the second phase, the dampers and the ER fluid were developed to meet the performance targets. Trade-offs were made between damper design and fluid formulation to achieve the desired damper dynamic range and power draw.A state-diagramm approach using screen test data was used to select candidate ER fluids. In the third phase of the programm, a prototype semi-active suspension system using fast, continuously variable ER dampers was installed on a demonstration vehicle. Heave, pitch, and roll motions of the vehicle were controlled by appling voltages independently to the four dampers as determined by a modified sky-hook algoritm. The system was designed to respond in less than 10 ms with an average power requirement less than 40 W for normal road surfaces and handling. Laboratory data from a pressure driven flow screen test and a damper test are presented that document the ER fluid performance specification and selection process. Vehicle performance data are presented that demonstrate the features of ER technology for the semi-active suspension application. Remaining issues for commercialization of ER fluids are discussed.


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    Title :

    The development of electrorheological fluids for an automotive semi-active suspension system


    Additional title:

    Entwicklung rheologischer Flüssigkeiten für eine halbaktive Raduafhängung für den Automobilbau


    Contributors:


    Publication date :

    1996


    Size :

    9 Seiten, 6 Bilder, 1 Tabelle, 6 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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