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    • 2. 发明授权
    • Weight optimized pressurizable aircraft fuselage structures having near elliptical cross sections
    • 重量优化的加压飞机机身结构具有近椭圆截面
    • US07621482B2
    • 2009-11-24
    • US11273966
    • 2005-11-15
    • Mithra M. K. V. SankrithiKevin Retz
    • Mithra M. K. V. SankrithiKevin Retz
    • B64C1/06
    • B64C1/061B64C1/08B64C2001/0045B64C2001/0072B64C2001/0081Y02T50/12Y02T50/43
    • An aircraft fuselage includes a tubular shell having a centerline axis, opposite ends, and a cross-section having a radius R(φ), where φ is the angular coordinate of a cylindrical coordinate system, a curvature Curv(φ), where Curv(φ) is the inverse of a local radius of curvature of a surface of the shell, and a circumferential shape that varies radially by no more than ±7% from that of an elliptical cross-section at substantially every station along the centerline axis between the nose and tail ends thereof. The weight of the shell is minimized by “tailoring,” i.e., optimizing, at least one structural attribute, expressed as a function of φ, associated with every element of the shell, such that the weight of the shell required to react a design load incident thereon is less than that required to react the same design load, but wherein the same structural attribute has not been so tailored.
    • 飞机机身包括具有中心线轴线,相对端部和具有半径R(phi)的横截面的管状壳体,其中,phi是圆柱坐标系的角坐标,曲率Curv(phi),其中Curv( phi)是壳体的表面的局部曲率半径的倒数,并且圆周形状沿着沿着中心线轴线的基本上每个站处的椭圆形截面的径向变化不超过±7% 鼻子和尾端。 通过与外壳的每个元件相关联的“定制”,即优化至少一个表示为与phi的函数的结构属性的至少一个结构属性,使得壳体的重量最小化,使得反应设计负载所需的壳的重量 其上的事件小于反应相同设计负载所需的事件,但是其中相同的结构属性尚未如此定制。
    • 4. 发明授权
    • Inflatable heliostatic solar power collector
    • 充气式日光太阳能集热器
    • US07997264B2
    • 2011-08-16
    • US11651396
    • 2007-01-10
    • Mithra M. K. V. Sankrithi
    • Mithra M. K. V. Sankrithi
    • F24J2/12
    • H01L31/0547F24S20/50F24S20/80F24S23/81F24S30/452F24S50/20F24S80/50H01L31/052H01L31/0543H02S20/00H02S40/425Y02B10/20Y02E10/47Y02E10/52
    • Increased utilization of solar power is highly desirable as solar power is a readily available renewable resource with power potential far exceeding total global needs; and as solar power does not contribute to pollutants associated with fossil fuel power, such as unburned hydrocarbons, NOx and carbon dioxide. The present invention provides low-cost inflatable heliostatic solar power collectors, which can be stand-alone units suitable for flexible utilization in small, medium, or utility scale applications. The inflatable heliostatic power collectors use a reflective surface or membrane “sandwiched” between two inflated chambers, and attached solar power receivers which may be of photovoltaic and/or solar thermal types. Modest concentration ratios enable benefits in both reduced cost and increased conversion efficiency, relative to simple prior-art flat plate solar collectors.
    • 由于太阳能发电是电力潜力大大超过全球总需求的现成可再生能源,太阳能发电利用率提高是非常可取的。 并且由于太阳能不会对与化石燃料动力相关的污染物例如未燃碳氢化合物,NOx和二氧化碳造成影响。 本发明提供了低成本的可充气的日光太阳能收集器,其可以是适合在小型,中型或公用事业级应用中灵活应用的独立单元。 可充气的日光放电收集器使用“夹在”两个充气室之间的反射表面或膜,以及可以是光伏和/或太阳能热型的附接太阳能接收器。 相对于简单的现有技术的平板太阳能集热器,适度的浓度比可以降低成本和提高转换效率。
    • 6. 发明授权
    • Aircraft tailstrike avoidance system
    • 飞机尾巴回避系统
    • US06422517B1
    • 2002-07-23
    • US09520329
    • 2000-03-07
    • Wendi M. DeWittDavid P. EggoldMonte R. EvansMithra M. K. V. SankrithiStephen L. Wells
    • Wendi M. DeWittDavid P. EggoldMonte R. EvansMithra M. K. V. SankrithiStephen L. Wells
    • G05D108
    • G05D1/0808B64C13/503B64D45/04G05D1/0653
    • An improvement to an aircraft flight control system is provided for reducing the likelihood of an aircraft tailstrike. The flight control system includes a pitch command provided to a pitch control device for altering the aircraft's pitch attitude. The improvement is a system of altering the pitch command to avoid an aircraft tailstrike. The improvement includes determining a current tailskid closure rate and a current tail height; comparing the current tailskid closure rate with a threshold closure rate to determine an excess closure rate amount; and adding an incremental nose-down pitch command with the pitch command to avoid a potential aircraft tailstrike. The threshold closure rate is dependent upon the current tailskid height. The incremental nose-down pitch command is calculated as a function of the excess closure rate amount. An alternative embodiment is provided in which the current height is compared with a threshold height (that is a function of the current tailskid closure rate) to determine an excess height amount. The excess height is then used to form an incremental nose-down pitch command. Another embodiment is described using both height and rate thresholds to calculate the incremental nose-down pitch command. Alternative arrangements may be used in which other non-derivative and derivative values are used, e.g., pitch angle margin and pitch rate.
    • 提供了对飞机飞行控制系统的改进,以减少飞机尾翼的可能性。 飞行控制系统包括提供给俯仰控制装置的俯仰指令,用于改变飞机的俯仰姿态。 改进是改变俯仰命令以避免飞机尾迹的系统。 改进包括确定当前尾部关闭速率和当前尾部高度; 将当前tailskid关闭率与阈值关闭率进行比较以确定过多关闭率; 并用俯仰指令添加增量的下降俯仰指令,以避免潜在的飞机尾迹。 阈值关闭率取决于当前的tailskid高度。 根据过度闭合率量的函数计算增量下降音调指令。 提供了一个替代实施例,其中将当前高度与阈值高度(即当前尾部关闭速率的函数)进行比较以确定过高高度量。 然后使用多余的高度来形成增量的向下俯仰间距指令。 使用高度和速率阈值来描述另一个实施例来计算增量的向下俯仰俯仰指令。 可以使用替代布置,其中使用其他非导数和导数值,例如俯仰角余量和俯仰速率。
    • 7. 发明授权
    • Automated galley cart stowage system
    • 自动厨房车载系统
    • US06305643B1
    • 2001-10-23
    • US09436785
    • 1999-11-08
    • Mithra M. K. V. Sankrithi
    • Mithra M. K. V. Sankrithi
    • B64C120
    • B64D11/0007
    • An automated cart stowage system is provided for use in an aircraft having a passenger deck with a galley and a lower deck located below the passenger deck. The system includes a number of movable galley carts, a container sized and shaped to be located within the lower deck, a passageway located in the container and extending vertically upward into the galley, a cart lift for automatically transferring at least one galley cart at a time between the passenger deck and the container, and access device positionable within the passageway. The container is used for storing the galley carts during flight. The container includes first and second interior regions. The galley carts are storable end-to-end in the second region. An access space is left available between carts. During normal operations, the cart lift transfers carts between the passenger deck and the container. During anomalous conditions, the access device is made available to assist an attendant in entering and exiting the container via the passageway to thereby manually transfer material to and from the carts stored in the container. The first region provides an aisle for the attendant to access the carts. The access space between carts allows the attendant to shift carts in order to access the contents of each cart.
    • 提供了一种用于具有乘客甲板的飞机的自动推车装载系统,其具有位于乘客甲板下方的厨房和下甲板。 该系统包括多个可移动的厨房推车,容器的尺寸和形状设置在下层甲板内,通道位于容器中并垂直向上延伸进入厨房,用于在至少一个厨房推车 乘客甲板和集装箱之间的时间以及可在通道内定位的通道装置。 集装箱用于在飞行过程中储存厨房推车。 容器包括第一和第二内部区域。 厨房车可在第二区域端对端存放。 购物车之间可以使用存取空间。 在正常操作期间,推车升降机在客舱和集装箱之间移动推车。 在异常情况下,进入装置可用于帮助服务员经由通道进出容器,从而手动地将材料转移到存储在容器中的推车上。 第一个地区为乘务员提供进出车的通道。 推车之间的存取空间允许服务员移动购物车以访问每个购物车的内容。
    • 10. 发明授权
    • Floating ice sheet based renewable thermal energy harvesting system
    • 浮动冰盖可再生能源采集系统
    • US08393553B2
    • 2013-03-12
    • US12006035
    • 2007-12-31
    • Mithra M. K. V. SankrithiSiva U. M. Sankrithi
    • Mithra M. K. V. SankrithiSiva U. M. Sankrithi
    • F25C3/04
    • F03G7/04
    • The invention provides a floating ice sheet based renewable thermal energy harvesting system, that can harvest energy from naturally occurring temperature differential between liquid water below a floating ice sheet that is substantially at the freezing temperature of water (0 degrees C. or slightly lower for salt water), and colder air above the floating ice sheet. For example, this is a naturally occurring phenomenon in Arctic and Antarctic region sea ice or ice shelf regions, where the air temperature above the floating ice may range from −5 degrees C. down to winter extreme cold temperatures of around −50 degrees C. In addition to the inventive application of thermodynamic cycle engines to harvest renewable energy from this naturally occurring temperature differential, variant embodiments also combine wind energy and/or solar energy subsystems to provide synergistic further benefits and greater quantities of renewable energy harvestable from devices of this class.
    • 本发明提供了一种基于浮冰的可再生热能收集系统,其可以从基本上处于水的冷冻温度(0摄氏度或稍低于盐的)的浮冰片之下的液态水之间的天然存在的温度差获得能量 水),以及浮冰上方较冷的空气。 例如,这是北极和南极地区海冰或冰架区域中天然存在的现象,其中浮冰上方的空气温度可能在-5摄氏度到冬至极端寒冷的温度在-50度左右。 除了本发明应用热力循环发动机以从这种天然存在的温差收集可再生能源之外,变体实施例还结合了风能和/或太阳能子系统以提供协同的进一步的益处,并且从该类装置可收获的更大数量的可再生能源 。