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公开(公告)号：US4025337A
公开(公告)日：1977-05-24
申请号：US562873
申请日：1975-03-28
摘要： Powdered metal is continuously introduced into a die cavity in discrete quantities and compacted into bar segments to form a bar. The cavity has a fixed cross-sectional area and is open at both ends, except during the initial compaction when one end is closed. After formation of a length of the bar, the frictional resistance between the bar and the cavity wall is relied on so that the bar remaining in the cavity serves as a stopper for subsequent compactions of the discrete quantities of powdered metal to form the continuous bar. The bar is forced out of the cavity and may be passed through an induction furnace for sintering, and through a swager, all preferably in a continuous operation. Also provided is means for varying the compaction so that the bar lengths formed from the discrete quantities of powdered metal are compacted and bonded into a bar of substantially uniform physical characteristics along its length.
摘要翻译： 粉末金属以分散的量连续引入模腔中并压实成棒段以形成棒。 空腔具有固定的横截面积，并且在两端敞开，除了在一端封闭时的初始压实过程中。 在形成一定长度的棒之后，杆和空腔壁之间的摩擦阻力被依赖，使得留在空腔中的杆用作后续的离散量的粉末状金属压块以形成连续棒的塞子。 棒被迫离开空腔，并且可以通过感应炉进行烧结，并且通过吹扫，优选地在连续操作中。 还提供了用于改变压实的装置，使得由分散量的粉末金属形成的棒长度被压实并结合成沿其长度的基本上均匀的物理特性的棒。
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2.发明授权Method and apparatus for determining close approaches for earth-fixed launch trajectories 失效用于确定地球固定发射轨迹的近距离方法的方法和装置
公开(公告)号：US6102334A
公开(公告)日：2000-08-15
申请号：US31800
申请日：1998-02-27
申请人： Douglas Claffey , James Woodburn
发明人： Douglas Claffey , James Woodburn
摘要： Determining suitable launch windows to avoid or minimize close approaches between a launch vehicle and orbiting objects. A method and apparatus is disclosed for minimizing close approaches between spacecraft and other objects in space during the launch and early deployment phase of their lifetime, by defining a launch window, utilizing filters to screen certain objects in space from consideration and identifying launch window blackout times to avoid close approaches with the remaining objects in space under consideration.
摘要翻译： 确定合适的发射窗口以避免或最小化运载火箭和轨道物体之间的紧密接近。 公开了一种方法和装置，用于通过定义启动窗口，利用过滤器来筛选空间中的某些对象并识别启动窗口停电时间，以使其在空间中的空间中的其他物体之间的距离最小化 以避免与正在考虑的空间中的剩余物体紧密接近。
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3.发明授权Method and apparatus for calculating access between satellite constellations and ground targets 失效用于计算卫星星座和地面目标之间的接入的方法和装置
公开(公告)号：US6144334A
公开(公告)日：2000-11-07
申请号：US030977
申请日：1998-02-26
申请人： Douglas Claffey , James Woodburn
发明人： Douglas Claffey , James Woodburn
摘要： Assessing performance of satellite constellations. For a given constellation of satellites, each having a given number of sensors, a method is disclosed for determining the times of access between each sensor and a plurality of targets located on Earth. Calculation time required for determining access is greatly decreased using pre-computed access calculations as a baseline.
摘要翻译： 评估卫星星座的性能。 对于具有给定数量的传感器的给定星座卫星，公开了一种用于确定每个传感器与位于地球上的多个目标之间的接入时间的方法。 使用预先计算的访问计算作为基准，大大减少了确定访问所需的计算时间。
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