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    • 3. 发明授权
    • Torque limiting devices for actuators
    • 用于执行机构的扭矩限制装置
    • US07766751B2
    • 2010-08-03
    • US11858709
    • 2007-09-20
    • Donald J. ChristensenBrian JardineDon L. Mittendorf
    • Donald J. ChristensenBrian JardineDon L. Mittendorf
    • F16D9/02
    • F16D7/08G05G1/082
    • A torque limiting includes first and second rotational plates, first and second springs, and a slip device. The first rotational plate is coupled to a torque input device. The second rotational plate is coupled to a drive shaft, and is configured to be movable along an axial direction thereof. The first spring has a first free length, and exerts a first spring force against the second rotational plate toward the first rotational plate. The second spring has a second free length, smaller than the first free length, and selectively exerts a second spring force against the second rotational plate toward the first rotational plate. The slip device, disposed at least partially within or between the first and second rotational plates, causes relative motion between the first and second rotational plates when torque overcomes the combined first and second spring forces exerted against the second rotational plate.
    • 扭矩限制包括第一和第二旋转板,第一和第二弹簧以及滑动装置。 第一旋转板联接到扭矩输入装置。 第二旋转板联接到驱动轴,并且构造成可沿其轴向方向移动。 第一弹簧具有第一自由长度,并且朝向第一旋转板施加抵靠第二旋转板的第一弹簧力。 第二弹簧具有比第一自由长度小的第二自由长度,并且朝向第一旋转板选择性地向第二旋转板施加第二弹簧力。 当扭矩克服施加在第二旋转板上的组合的第一和第二弹簧力时,滑动装置至少部分地设置在第一和第二旋转板之中或之间,引起第一和第二旋转板之间的相对运动。
    • 4. 发明申请
    • TORQUE LIMITING DEVICES FOR ACTUATORS
    • 用于执行器的扭矩限制装置
    • US20090078524A1
    • 2009-03-26
    • US11858709
    • 2007-09-20
    • Donald J. ChristensenBrian JardineDon L. Mittendorf
    • Donald J. ChristensenBrian JardineDon L. Mittendorf
    • F16D43/20
    • F16D7/08G05G1/082
    • A torque limiting includes first and second rotational plates, first and second springs, and a slip device. The first rotational plate is coupled to a torque input device. The second rotational plate is coupled to a drive shaft, and is configured to be movable along an axial direction thereof. The first spring has a first free length, and exerts a first spring force against the second rotational plate toward the first rotational plate. The second spring has a second free length, smaller than the first free length, and selectively exerts a second spring force against the second rotational plate toward the first rotational plate. The slip device, disposed at least partially within or between the first and second rotational plates, causes relative motion between the first and second rotational plates when torque overcomes the combined first and second spring forces exerted against the second rotational plate.
    • 扭矩限制包括第一和第二旋转板,第一和第二弹簧以及滑动装置。 第一旋转板联接到扭矩输入装置。 第二旋转板联接到驱动轴,并且构造成可沿其轴向方向移动。 第一弹簧具有第一自由长度,并且朝向第一旋转板施加抵靠第二旋转板的第一弹簧力。 第二弹簧具有比第一自由长度小的第二自由长度,并且朝向第一旋转板选择性地向第二旋转板施加第二弹簧力。 当扭矩克服施加在第二旋转板上的组合的第一和第二弹簧力时,滑动装置至少部分地设置在第一和第二旋转板之中或之间,引起第一和第二旋转板之间的相对运动。
    • 10. 发明授权
    • Solid propellant burn rate, propellant gas flow rate, and propellant gas pressure pulse generation control system and method
    • 固体推进剂燃烧速率,推进剂气体流量和推进剂气体压力脉冲发生控制系统及方法
    • US07886519B2
    • 2011-02-15
    • US11683170
    • 2007-03-07
    • George T. WoessnerStephen G. AbelRonald A. PeckMark H. BakerDonald J. Christensen
    • George T. WoessnerStephen G. AbelRonald A. PeckMark H. BakerDonald J. Christensen
    • F02K9/00
    • F02K9/26
    • Systems and methods of controlling solid propellant burn rate, propellant gas pressure, propellant gas pressure pulse shape, and propellant gas flow rate, rely on pulse width modulation of a control valve duty cycle. A control valve that is movable between a closed position and a full-open position is disposed downstream of, and in fluid communication with, a solid propellant gas generator. The solid propellant in the solid propellant gas generator is ignited, to thereby generate propellant gas. The control valve is moved between the closed position and the full-open position at an operating frequency and with a valve duty cycle. The valve duty cycle is the ratio of a time the control valve is in the full-open position to a time it takes the valve to complete one movement cycle at the operating frequency. The valve duty cycle is controlled to attain a desired solid propellant burn rate, propellant gas pressure, propellant gas pressure pulse shape, and/or propellant gas flow rate.
    • 控制固体推进剂燃烧速率,推进剂气体压力,推进剂气体压力脉冲形状和推进剂气体流量的系统和方法依赖于控制阀占空比的脉宽调制。 可在关闭位置和全开位置之间移动的控制阀设置在固体推进剂气体发生器的下游并且与固体推进剂气体发生器流体连通。 固体推进剂气体发生器中的固体推进剂被点燃,从而产生推进剂气体。 控制阀在工作频率和阀门占空比下在关闭位置和全开位置之间移动。 阀门占空比是控制阀处于全开位置的时间与阀门在工作频率下完成一个运动循环所需的时间之比。 控制阀占空比以获得所需的固体推进剂燃烧速率,推进剂气体压力,推进剂气体压力脉冲形状和/或推进剂气体流速。