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    • 31. 发明授权
    • Slotted beam piezoelectric composite
    • 开槽梁压电复合材料
    • US07692365B2
    • 2010-04-06
    • US11604117
    • 2006-11-24
    • David L. ChurchillSteven W. Arms
    • David L. ChurchillSteven W. Arms
    • H01L41/08H01L41/107
    • H01L41/1136H02N2/188
    • One aspect of the present patent application is an energy harvesting device comprising a composite structure including a base spring and a piezoelectric structure. The base spring has a base spring surface having elevated portions separated by a recessed portion. The piezoelectric structure substantially crosses the recessed portion. In one aspect the piezoelectric structure includes a piezoelectric element that is bonded to the elevated portions. In another aspect, the base spring has a base spring stiffness. The piezoelectric element has a piezoelectric element stiffness. The base spring stiffness is less than the piezoelectric element stiffness. In another aspect, the composite structure has a natural frequency of vibration, and this natural frequency of vibration of the composite structure is automatically adjustable. In another aspect, the piezoelectric elements are stacked. In another aspect, the piezoelectric structure is located in the recessed portion.
    • 本专利申请的一个方面是能量收集装置,其包括包括基座弹簧和压电结构的复合结构。 基座弹簧具有基部弹簧表面,该基座弹簧表面具有由凹部分开的升高部分。 压电结构基本上跨越凹部。 在一个方面,压电结构包括结合到升高部分的压电元件。 另一方面,基座弹簧具有基座弹簧刚度。 压电元件具有压电元件刚度。 基座弹簧刚度小于压电元件刚度。 另一方面,复合结构具有固有的振动频率,复合结构的固有振动频率可自动调节。 另一方面,压电元件被堆叠。 另一方面,压电结构位于凹部中。
    • 38. 发明授权
    • Piezoelectric composite with tapered beam
    • 带锥形梁的压电复合材料
    • US07880370B2
    • 2011-02-01
    • US12755340
    • 2010-04-06
    • David L. ChurchillSteven W. Arms
    • David L. ChurchillSteven W. Arms
    • H01L41/107
    • H01L41/1136H02N2/188
    • An energy harvesting system includes a composite structure that includes a base spring and a first piezoelectric element. The first piezoelectric element is mounted on the base spring. The base spring has a base spring thickness, a base spring length, and a base spring width. The base spring is for vibrating around an axis parallel to the base spring width. The base spring thickness varies from position to position along a direction parallel to the base spring length. The base spring thickness varies to provide the first piezoelectric element with constant strain when the base spring vibrates around the axis parallel to the base spring width.
    • 能量收集系统包括复合结构,其包括基座弹簧和第一压电元件。 第一压电元件安装在基座弹簧上。 基座弹簧具有基座弹簧厚度,底座弹簧长度和基座弹簧宽度。 基座弹簧用于围绕平行于基座弹簧宽度的轴线振动。 基座弹簧厚度沿着与基座弹簧长度平行的方向从位置到位置不同。 当基座弹簧围绕平行于基座弹簧宽度的轴线振动时,基座弹簧厚度变化以提供具有恒定应变的第一压电元件。
    • 39. 发明授权
    • Capacitive discharge energy harvesting converter
    • 电容放电能量收集转换器
    • US07781943B1
    • 2010-08-24
    • US12009945
    • 2008-01-23
    • Michael J. HamelDavid L. Churchill
    • Michael J. HamelDavid L. Churchill
    • H02N2/18
    • H02N2/181
    • An energy harvesting circuit includes a device for converting mechanical energy into electrical energy, a solid state voltage dependent switch, and an inductor. The piezoelectric device, the solid state voltage dependent switch, and the inductor are all connected in series. The solid state voltage dependent switch has a first threshold The solid state voltage dependent switch remains open until voltage applied across the solid state voltage dependent switch by the device reaches the first threshold. When the voltage applied across the solid state voltage dependent switch reaches the first threshold the solid state voltage dependent switch closes so charge from the device flows through the switch and through the inductor.
    • 能量收集电路包括用于将机械能转换为电能的装置,固态电压依赖开关和电感器。 压电器件,固态电压相关开关和电感器都是串联的。 固态电压相关开关具有第一阈值固态电压相关开关保持断开,直到由器件施加在固态电压依赖开关上的电压达到第一阈值。 当施加在固态电压依赖开关上的电压达到第一阈值时,固态电压依赖开关闭合,因此来自器件的电荷流过开关并通过电感器。
    • 40. 发明授权
    • Inertial measurement system with self correction
    • 惯性测量系统具有自校正功能
    • US08010308B1
    • 2011-08-30
    • US12277244
    • 2008-11-24
    • David L. Churchill
    • David L. Churchill
    • G01C25/00G06F19/00
    • G01C21/16G01C25/005
    • A method of navigation includes providing an angular rate sensor and a direction-of-gravity reference. The method also includes determining bias error of the angular rate sensor about a vertical axis based on data substantially from the angular rate sensor and from the direction-of-gravity reference. In one embodiment, the first angular rate sensor is moved from a first position around a substantially horizontal axis to a second position around the substantially horizontal axis. The first angular rate sensor provides angular rate data for attitude at the first position and for compass heading at the second position. Data from the first angular rate sensor and from the direction-of-gravity reference is processed with a program for determining a bias error correction for the first angular rate sensor while the first angular rate sensor is in the first position. Bias error correction determined while the first angular rate sensor is in the first position is used to correct angular rate of the first angular rate sensor while the first angular rate sensor is in the second position.
    • 一种导航方法包括提供角速率传感器和重力参考。 该方法还包括基于基本上从角速率传感器和重力参考方向的数据确定角速率传感器关于垂直轴的偏置误差。 在一个实施例中,第一角速度传感器从围绕基本水平轴线的第一位置移动到围绕基本水平轴线的第二位置。 第一角速度传感器提供用于在第一位置处的姿态的角速率数据,并且在第二位置处提供用于罗盘的角速度数据。 来自第一角速度传感器和来自重心参考的数据用第一角速度传感器处于第一位置的用于确定第一角速度传感器的偏差误差校正的程序进行处理。 在第一角速度传感器处于第一位置时确定的偏置误差校正用于在第一角速度传感器处于第二位置时校正第一角速度传感器的角速率。