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23 条记录 (耗时 0.023 秒)

    Tilt control for chair
    4.
    发明授权
    Tilt control for chair 有权

    公开(公告)号：US06361110B1

    公开(公告)日：2002-03-26

    申请号：US09746180

    申请日：2000-12-21

    申请人： Richard N. Roslund, Jr. ,  Patrick Nelson ,  Larry Allen Wilkerson ,  Troy Roark ,  Joel Dral ,  Steve Simpson ,  John Clark

    发明人： Richard N. Roslund, Jr. ,  Patrick Nelson ,  Larry Allen Wilkerson ,  Troy Roark ,  Joel Dral ,  Steve Simpson ,  John Clark

    IPC分类号： A47C320

    摘要： A tilt control mechanism for an office chair includes a spring arrangement which permits forward and rearward tilting of the chair while also urging the chair to a normal upright position. The spring arrangement includes front and rear springs which act in combination such that the upward acting forces acting on the chair can be varied during use. The forces being applied by the front spring are adjusted by a side-actuated tension adjustment mechanism which incorporates a wedge block for adjusting the spring forces. Further, the rear springs provide a variable spring force such that the spring force is maximized when in the normal position but is decreased substantially once the chair is fully reclined. This reduction in spring force allows a user to maintain the chair in the fully reclined position with significantly less force than was required to tilt the chair rearwardly while a sufficient spring force continues to be applied by the front spring to urge the chair to the normal position.

    Gimbal disturbance calibration and compenstion
    9.
    发明申请
    Gimbal disturbance calibration and compenstion 有权
    云台干扰校准和补偿

    公开(公告)号：US20070027590A1

    公开(公告)日：2007-02-01

    申请号：US11191805

    申请日：2005-07-28

    申请人： Ketao Liu ,  Justin Burch ,  Gregory Becker ,  Patrick Nelson

    发明人： Ketao Liu ,  Justin Burch ,  Gregory Becker ,  Patrick Nelson

    IPC分类号： G01C23/00 ,  G06F17/00

    CPC分类号： G01C25/00 ,  G01C19/00

    摘要： Various embodiments of the present invention are directed to precision control system for spacecraft gimbaled payloads. Embodiments of the invention provide an innovative technique of calibrating gimbals disturbances to directly canceling gimbal control disturbances. Such a calibration system includes a receiver for receiving telemetry data for pointing a payload, a processor for calculating a disturbance parameter vector for a gimbal disturbance model with the telemetry data and a transmitter for transmitting the disturbance parameter vector to compensate for pointing error when applied in pointing the payload. The gimbal disturbance model comprises a harness stiffness term, a disturbance harmonics term and at least one friction hysteresis term. The telemetry data may be time matched prior to calculating the disturbance parameter vector. Typically, the telemetry data comprises gimbal angle and applied torque data and the disturbance parameter vector is calculated from convergence of an iterative gradient computation with the telemetry data.

    摘要翻译： 本发明的各种实施例涉及用于航天器万向有载荷的精密控制系统。 本发明的实施例提供了一种用于校准万向架干扰以直接抵消万向节控制扰动的创新技术。 这样的校准系统包括用于接收用于指示有效载荷的遥测数据的接收器，用于利用遥测数据计算用于万向干扰模型的扰动参数矢量的处理器，以及用于发送干扰参数矢量的发射机，以补偿当应用于 指向有效载荷 万向节干扰模型包括线束刚度项，扰动谐波项和至少一个摩擦滞后项。 遥测数据可以在计算干扰参数矢量之前进行时间匹配。 通常，遥测数据包括万向角和施加的扭矩数据，并且通过迭代梯度计算与遥测数据的收敛来计算扰动参数向量。