| 摘要 |
A user interface system includes a user interface and a plurality of torsion bars. The user interface is configured to rotate, from a null position, about two perpendicular rotational axes. The plurality of torsion bars are coupled to the user interface and include two or more torsion bars disposed along a first one of the rotational axes and two or more torsion bars disposed along a second one of the rotational axes. Each torsion bar is configured to selectively supply a feedback force to the user interface that opposes the rotational direction and that varies as a function of the control position and the rotational direction. The system provides for the setting and adjustment of a preload force to the user interface, for retaining the set preload force, for passively returning the user interface to its null position, and for preventing each passive mechanism from introducing additional force into adjacent vectors.
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