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    Dual horsehead block and tackle pumping unit
    3.
    发明授权
    Dual horsehead block and tackle pumping unit 有权

    公开(公告)号：US09970420B2

    公开(公告)日：2018-05-15

    申请号：US14876819

    申请日：2015-10-07

    申请人： Yi Wang ,  Jin Wang ,  Zijiang Yang

    发明人： Yi Wang ,  Jin Wang ,  Zijiang Yang

    IPC分类号： F04B47/02 ,  F04B17/03 ,  F16H3/66 ,  E21B43/12

    CPC分类号： F04B17/03 ,  E21B43/127 ,  E21B2043/125 ,  F04B47/022 ,  F16H3/666

    摘要： A dual horsehead block and tackle beam pumping unit including a steel frame, a walking beam installed on top of the steel frame, horseheads with movable pulleys, pulling wire ropes, load wire ropes, damping extension springs, a reversing reducer, an output drum, a counterweight box, reversing brake mechanisms, and an electric motor is provided for single well and dual well operations. The horseheads are installed on opposing ends of the walking beam. The movable pulley of each horsehead has a pulling wire rope. The first and second ends of each pulling wire rope are connected to the damping extension spring and the output drum respectively. A lower end of the load wire rope hanging on the right hand side horsehead is connected to the counterweight box. On the bottom of the steel frame, the electric motor, the reversing reducer, and the output drum are installed on a base.

    Efficient approaches for bounded model checking
    4.
    发明授权
    Efficient approaches for bounded model checking 失效
    有限模型检查的有效方法

    公开(公告)号：US07711525B2

    公开(公告)日：2010-05-04

    申请号：US10157486

    申请日：2002-05-30

    申请人： Malay Ganai ,  Lintao Zhang ,  Aarti Gupta ,  Zijiang Yang ,  Pranav Ashar

    发明人： Malay Ganai ,  Lintao Zhang ,  Aarti Gupta ,  Zijiang Yang ,  Pranav Ashar

    IPC分类号： G06F17/10

    CPC分类号： G06F17/504

    摘要： A method for bounded model checking of arbitrary Linear Time Logic temporal properties. The method comprises translating properties associated with temporal operators F(p), G(p), U(p, q) and X(p) into property checking schemas comprising Boolean satisfiability checks, wherein F represents an eventuality operator, G represents a globally operator, U represents an until operator and X represents a next-time operator. The overall property is checked in a customized manner by repeated invocations of the property checking schemas for F(p), G(p), U(p, q), X(p) operators and standard handling of atomic propositions and Boolean operators.

    摘要翻译： 一种用于任意线性时间逻辑时间属性的有界模型检查的方法。 该方法包括将与时间运算符F（p），G（p），U（p，q）和X（p）相关联的属性转换成包括布尔可满足性检查的属性检查模式，其中F表示可能性运算符，G表示全局 运算符，U表示直到运算符，X表示下一运算符。 通过重复调用F（p），G（p），U（p，q），X（p）运算符的属性检查模式以及原子命题和布尔运算符的标准处理来检查整体属性。

    SAT-based image computation with application in reachability analysis
    5.
    发明授权
    SAT-based image computation with application in reachability analysis 有权
    基于SAT的图像计算应用于可达性分析

    公开(公告)号：US06728665B1

    公开(公告)日：2004-04-27

    申请号：US09693979

    申请日：2000-10-23

    申请人： Aarti Gupta ,  Zijiang Yang ,  Pranav Ashar

    发明人： Aarti Gupta ,  Zijiang Yang ,  Pranav Ashar

    IPC分类号： G06F710

    CPC分类号： G06F17/504

    摘要： A method of performing image or pre-image computation for a system is disclosed. The method comprises representing the system by a finite state model; representing state sets using Binary Decision Diagrams (BDDs); performing a satisfiabilty checking (SAT) based backtrack search algorithm, wherein, the SAT decomposes the search over an entire solution space into multiple sub-problems, and wherein a BDD-based image computation is used to solve each sub-problem by enumerating multiple solutions from the solution space. Further, a method for pruning a search space in a SAT procedure is disclosed. The method comprises using BDD Bounding against an implicit disjunction or conjunction of a given set of BDDs; continuing search if a partial assignment of variables satisfies the implicit disjunction or conjunction, and backtracking if a partial assignment of variables does not satisfy the implicit disjunction or conjunction.

    摘要翻译： 公开了一种用于系统执行图像或预图像计算的方法。 该方法包括通过有限状态模型表示系统; 使用二进制决策图（BDD）表示状态集; 执行基于可靠性检查（SAT）的回溯搜索算法，其中，SAT将整个解空间的搜索分解成多个子问题，并且其中使用基于BDD的图像计算来通过枚举多个解决方案来解决每个子问题 从解决方案空间。 此外，公开了一种在SAT过程中修剪搜索空间的方法。 该方法包括使用BDD边界抵抗一组给定的BDD的隐式分离或连接; 如果变量的部分分配满足隐式分离或连接，并且如果变量的部分分配不满足隐式分离或连接，则继续搜索。

    Dual Horsehead Block And Tackle Pumping Unit
    10.
    发明申请
    Dual Horsehead Block And Tackle Pumping Unit 审中-公开
    双马头块和卸扣单元

    公开(公告)号：US20160123124A1

    公开(公告)日：2016-05-05

    申请号：US14876819

    申请日：2015-10-07

    申请人： Yi Wang ,  Jin Wang ,  Zijiang Yang

    发明人： Yi Wang ,  Jin Wang ,  Zijiang Yang

    IPC分类号： E21B43/12 ,  F04B49/02 ,  F04B17/03 ,  F04B47/02

    CPC分类号： F04B17/03 ,  E21B43/127 ,  E21B2043/125 ,  F04B47/022 ,  F16H3/666

    摘要： A dual horsehead block and tackle beam pumping unit including a steel frame, a walking beam installed on top of the steel frame, horseheads with movable pulleys, pulling wire ropes, load wire ropes, damping extension springs, a reversing reducer, an output drum, a counterweight box, reversing brake mechanisms, and an electric motor is provided for single well and dual well operations. The horseheads are installed on opposing ends of the walking beam. The movable pulley of each horsehead has a pulling wire rope. The first and second ends of each pulling wire rope are connected to the damping extension spring and the output drum respectively. A lower end of the load wire rope hanging on the right hand side horsehead is connected to the counterweight box. On the bottom of the steel frame, the electric motor, the reversing reducer, and the output drum are installed on a base.

    摘要翻译： 一种双马头块和滑车梁泵送单元，包括钢框架，安装在钢框架顶部的步进梁，带有活动滑轮的马头，拉绳绳，负载绳索，阻尼拉伸弹簧，换向减速器，输出滚筒， 为单井和双井操作提供了配重箱，反向制动机构和电动马达。 马头安装在步进梁的相对端。 每个马头的可动皮带轮都有拉绳。 每个牵引钢丝绳的第一和第二端分别连接到阻尼拉伸弹簧和输出鼓。 悬挂在右侧马头上的负载钢丝绳的下端连接到配重箱。 在钢框架的底部，电动机，换向减速器和输出鼓安装在基座上。