Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019 ; Cataloged from PDF version of thesis. ; Includes bibliographical references (pages 77-81). ; Physics simulators play an important role in robot state estimation, planning and control; however, many real-world control problems involve complex contact dynamics that cannot be characterized analytically. Therefore, most physics simulators employ approximations that lead to a loss in precision. We propose a hybrid dynamics model, combining a deterministic physical simulator with a stochastic neural network for dynamics modeling as it provides us with expressiveness, efficiency, and generalizability simultaneously. To demonstrate this, we compare our hybrid model to both purely analytical models and purely learned models. We then show that our model is able to characterize the complex distribution of object trajectories and compare it with existing methods. We further build in object based representation into the neural network so that our hybrid model can generalize across number of objects. Finally, we use our hybrid model to complete complex control tasks in simulation and on a real robot and show that our model generalizes to novel environments with varying object shapes and materials. ; by Anurag Ajay. ; S.M. ; S.M. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science


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    Title :

    Augmenting physics simulators with neural networks for model learning and control



    Publication date :

    2019-01-01


    Remarks:

    1124767014


    Type of media :

    Theses


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    629




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