Control valve abnormality detection method and apparatus
    9.
    发明授权
    Control valve abnormality detection method and apparatus 失效
    控制阀异常检测方法及装置

    公开(公告)号:US5758686A

    公开(公告)日:1998-06-02

    申请号:US864846

    申请日:1997-05-29

    摘要: In a control valve abnormality detection method of detecting abnormality in a control valve, a characteristic expression representing the relationship between three factors in the normal state of the control valve is pre-set. The three factors consist of the displacement of the valve stem, a driving force from the valve stem driving device which changes upon displacement of the valve stem, and the force of the fluid which acts on one end of the valve stem through the valve. The three factors are detected on the basis of measurement result. On the basis of two factors selected from the detected three factors, the estimated value of one factor, which is not selected, is calculated by using the pre-set characteristic expression. The detected value of one factor, which is not selected, is compared with the calculated estimated value, and abnormality in the control valve is determined on the basis of the comparison result. A control valve abnormality detection apparatus is also disclosed.

    摘要翻译: 在检测控制阀的异常的控制阀异常检测方法中,预先设定代表控制阀的正常状态的三个因素之间的关系的特征表达式。 这三个因素包括阀杆的位移,来自阀杆驱动装置的驱动力,其在阀杆的位移上变化,以及通过阀门作用在阀杆的一端上的流体的力。 在测量结果的基础上检测出三个因素。 基于从检测到的三个因素中选择的两个因素,通过使用预设的特征表达式来计算未选择的一个因子的估计值。 将未选择的一个因子的检测值与计算出的估计值进行比较,并且基于比较结果确定控制阀中的异常。 还公开了一种控制阀异常检测装置。

    Stick-slip detection method and apparatus
    10.
    发明授权
    Stick-slip detection method and apparatus 失效
    粘滑检测方法和装置

    公开(公告)号:US5750879A

    公开(公告)日:1998-05-12

    申请号:US864242

    申请日:1997-05-28

    CPC分类号: G01N19/02

    摘要: In a stick-slip detection method, the displacement of a movable member having a slidable contact portion is detected. A first quantity of state is calculated on the basis of the detected displacement of the movable member. A second quantity of state, which can be estimated from the first quantity of state, is calculated on the basis of the detected displacement of the movable member. An estimated quantity of state is calculated by estimating a second quantity of state from the calculated first quantity of state by using the relationship between the first and second predetermined quantities of state which are obtained from the displacement of the movable member in a normal sliding state. The calculated second quantity of state is compared with the estimated quantity of state to determine an abnormal sliding operation of the movable member on the basis of the comparison result. A stick-slip detection apparatus is also disclosed.

    摘要翻译: 在粘滑检测方法中,检测具有可滑动接触部分的可移动部件的位移。 基于检测到的可动构件的位移来计算第一数量的状态。 基于检测到的可动构件的位移来计算可以从第一数量状态估计的第二数量的状态。 通过使用从正常滑动状态下的可动件的位移获得的第一和第二预定状态量之间的关系,通过从计算的第一状态量估计第二数量的状态来计算估计的状态量。 将计算出的第二状态量与估计的状态量进行比较,以根据比较结果确定可动构件的异常滑动操作。 还公开了粘滑检测装置。