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    • 2. 发明授权
    • Frequency-selective command profile motion control
    • 频率选择指令轮廓运动控制
    • US08803465B1
    • 2014-08-12
    • US13441450
    • 2012-04-06
    • David A. SmithPatrick J. Argento
    • David A. SmithPatrick J. Argento
    • G05B19/25
    • G05B11/30
    • A motion command is constructed based on an optimized acceleration pulse designed to control the spectral content of the commanded acceleration. By way of judicious design of the pulse shape, the majority of the energy in the command is contained in a narrow baseband and rolls off rapidly in frequencies outside that band. Additionally, the command can be constructed to suppress selected frequency content in one or more attenuation bands outside the baseband. The resulting motion command permits rapid motion control, while avoiding the excitation of unwanted resonant response in the system while remaining tolerant of system uncertainty.
    • 基于设计用于控制指令加速度的频谱含量的优化加速度脉冲来构造运动命令。 通过对脉冲形状的明智设计,命令中的大部分能量被包含在窄基带中,并在该频带之外的频率中快速地滚降。 另外,该命令可被构造为抑制基带外的一个或多个衰减频带中的选定频率内容。 所产生的运动命令允许快速运动控制,同时避免系统中不需要的共振响应的激发,同时保持系统不确定性。
    • 7. 发明授权
    • Animal feeder
    • 动物饲养
    • US06761129B1
    • 2004-07-13
    • US10661124
    • 2003-09-15
    • David A. Smith
    • David A. Smith
    • A01K6102
    • A01K5/0225
    • An animal feeder includes a housing including a bottom wall and a peripheral wall. A cover is removably positionable over an opening defined by an upper edge of the peripheral wall for selectively opening or closing the housing. Each of a pair of mounts is positioned on the peripheral wall. A funnel is positioned in the housing and includes a spout extending outwardly through the bottom wall. A plate has an upper side that has a central area having a raised portion thereon. Each of a plurality of rods has a first end attached to the bottom wall and a second end attached to the plate such that the spout is vertically aligned with the raised portion. A limb mounting assembly includes a pair of male couplers for attaching to the mounts and a tether for selectively hanging the housing.
    • 动物饲养器包括一个包括一个底壁和一个周围壁的壳体。 盖可拆卸地定位在由周壁的上边缘限定的开口上,用于选择性地打开或关闭壳体。 一对支架中的每一个都位于周壁上。 漏斗定位在壳体中并包括通过底壁向外延伸的喷口。 板具有在其上具有凸起部分的中心区域的上侧。 多个杆中的每一个具有附接到底壁的第一端和附接到板的第二端,使得喷口与凸起部分垂直对准。 肢体安装组件包括一对用于附接到安装件的阳联接器和用于选择性地悬挂壳体的系绳。
    • 8. 发明授权
    • Reconfigurable free space wavelength cross connect
    • 可重构自由空间波长交叉连接
    • US06694073B2
    • 2004-02-17
    • US10120869
    • 2002-04-11
    • John E. GolubDavid A. SmithHarry PresleyZhuoyu Bao
    • John E. GolubDavid A. SmithHarry PresleyZhuoyu Bao
    • G02B626
    • G02B6/356G02B6/266G02B6/2931G02B6/29313G02B6/29395G02B6/3512G02B6/3518G02B6/3542G02B6/357G02B6/3582H04Q11/0005H04Q2011/0016H04Q2011/0022H04Q2011/0024H04Q2011/003H04Q2011/0049H04Q2011/0052
    • An optical cross connect, especially a wavelength cross connect, using free-space optics, a diffraction grating, and a micro electromechanical systems (MEMS) array of movable mirrors. A concentrator receives light from widely separated optical fibers and brings the beams together into a more closely spaced linear array. Free-space optics process all the beams. Front-end optics collimate the beams from the fibers and flatten their fields. The diffraction grating spectrally separates each beam into sub-beams. A long-focus lens focuses the sub-beams onto the 2-dimensional MEMS array. A fold mirror reflectively couples two such mirrors, whereby the switched signals propagate back through the same optics and are spectrally recombined onto the fibers. Other embodiments include white-color cross connects, multiple MEMS arrays, and parallel optics. Power dividers or wavelength interleavers can divide signals from the fibers, and multiple cross connects switch different wavelength groups.
    • 光学交叉连接,特别是波长交叉连接,使用自由空间光学,衍射光栅和可移动镜的微机电系统(MEMS)阵列。 集中器接收来自广泛分离的光纤的光,并将光束组合成更紧密间隔的线阵。 自由空间光学处理所有的光束。 前端光学器件使来自光纤的光束准直,并使其场平坦化。 衍射光栅将每个光束光谱分离成子光束。 长焦距透镜将子光束聚焦到二维MEMS阵列上。 折叠镜反射地耦合两个这样的反射镜,由此开关信号通过相同的光学器件传播回来并且光谱地重新结合到光纤上。 其他实施例包括白色交叉连接,多个MEMS阵列和并行光学器件。 功率分配器或波长交织器可以分离来自光纤的信号,并且多个交叉连接切换不同的波长组。
    • 9. 发明授权
    • Dynamic power equalization of many wavelength-division-multiplexed channels in a fiber-optic system
    • 光纤系统中许多波分复用通道的动态功率均衡
    • US06341021B1
    • 2002-01-22
    • US09023741
    • 1998-02-13
    • Alan E. WilnerDavid A. SmithJin-Xin CaiKai-Ming FengXingyu ZouShouhua Huang
    • Alan E. WilnerDavid A. SmithJin-Xin CaiKai-Ming FengXingyu ZouShouhua Huang
    • H04J1402
    • H04B10/2507H04J14/0221
    • A dynamic power equalization module (10) for an optical network is provided. It includes a module input (16) for receiving an optical transmission (14) containing a combination of different channels (C1-Cn). Each channel (C1-Cn) has a different characteristic wavelength (&lgr;1-&lgr;n) and different varying power. A power equalization device that is polarization insensitive is connected between the module input (16) and a module output (20). The power equalization device is driven by RF acoustic signals (26). A feedback loop (22) receives at least a portion of output from the module output (20) and generates, based upon a comparison of relative powers of the different channels (C1-Cn), the RF acoustic signals (26) which drive the power equalization device. The power equalization device is driven such that it dynamically controls transmission of the different channels (C1-Cn) to substantially equalize power differentials therebetween. The power equalization device includes a parallel array of acousto-optic modulators (AO1-AOn).
    • 提供了一种用于光网络的动态功率均衡模块(10)。 它包括用于接收包含不同信道(C1-Cn)的组合的光传输(14)的模块输入(16)。 每个通道(C1-Cn)具有不同的特征波长(lambd1-lambdn)和不同的变化功率。 在模块输入(16)和模块输出(20)之间连接有极化不敏感的功率均衡器件。 功率均衡装置由RF声信号(26)驱动。 反馈回路(22)接收来自模块输出(20)的输出的至少一部分,并且基于不同通道(C1-Cn)的相对功率的比较产生驱动 功率均衡器。 功率均衡装置被驱动,使得其动态地控制不同通道(C1-Cn)的传输,以使它们之间的功率差基本相等。 功率均衡装置包括声光调制器(AO1-AOn)的并联阵列。
    • 10. 发明授权
    • High-speed three-dimensional texture mapping systems and methods
    • 高速三维纹理映射系统及方法
    • US06229549B1
    • 2001-05-08
    • US09116184
    • 1998-07-15
    • David A. Smith
    • David A. Smith
    • G06T1140
    • G06T15/04
    • A three-dimensional texture is mapped onto a graphically-displayed surface by interpolating locations for elements of the texture using an associated distance relationship which locates the element with respect to the surface and a reference location spaced a distance apart from the surface. A first array of points representing the surface are stored, each of the points having an element of the three-dimensional texture and a distance to the element associated therewith. Upon a command to move the displayed surface, a new location for each point of the first array is computed, to obtain a second array representing the moved surface. A location for each element of the three-dimensional texture associated with each point of the first array is interpoled from the corresponding point in the second array and a reference location spaced apart from the moved surface.
    • 通过使用相对于表面定位元件的相关联的距离关系和与表面间隔开的距离的参考位置,通过内插纹理元素的位置来将三维纹理映射到图形显示的表面上。 存储表示表面的第一阵列的点,每个点具有三维纹理的元素和与其相关联的元素的距离。 当命令移动显示的表面时,计算出第一个数组的每个点的新位置,以获得表示移动表面的第二个数组。 与第一阵列的每个点相关联的三维纹理的每个元素的位置从第二阵列中的对应点和与移动表面间隔开的参考位置进行插值。