In real-time hybrid testing, systems are separated into a numerically simulated substructure and a physically tested substructure, coupled in real time using actuators and force sensors. Actuators tend to introduce spurious dynamics to the system which can result in inaccuracy or even instability. Conventional means of mitigating these dynamics can be ineffective in the presence of nonlinearity in the physical substructure or transfer system. This article presents the first experimental tests of a novel passivity-based controller for hybrid testing. Passivity control was found to stabilize a real-time hybrid test which would otherwise exhibit instability due to the combination of actuator lag and a stiff physical substructure. Limit cycle behaviour caused by nonlinear friction in the actuator was also reduced by 95% with passivity control, compared to only 64% for contemporary methods. The combination of passivity control with conventional methods is shown to reduce actuator lag from 35.3° to 13.7°. A big advantage of passivity control is its simplicity compared with model-based compensators, making it an attractive choice in a wide range of contexts.


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    Title :

    Passivity Control for Nonlinear Real-time Hybrid Tests


    Contributors:

    Publication date :

    2021-07-01


    Remarks:

    Peiris , L , Plummer , A & Du Bois , J 2021 , ' Passivity Control for Nonlinear Real-time Hybrid Tests ' , Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering , vol. 235 , no. 6 , pp. 914-928 . https://doi.org/10.1177/0959651820959003



    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    629




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