Abstract:
In a method for monitoring a control loop in a process plant, process gain data associated with a control loop may be collected. The collected process gain data may be used to determine an expected process gain behavior. For example, expected values of a process variable for given values of a load variable may be determined. As another example, expected changes in a process variable for given changes in a load variable may be determined. Then, during operation of the control loop, the process gain may be monitored. If the monitored process gain substantially deviates from the expected behavior, this may indicate an abnormal situation associated with the control loop.
Abstract:
A lead-lag input filter is connected ahead of a positioner feedback loop having one or more valve accessories, such as a volume booster or a QEV, to overcome slow dynamics experienced by the accessories when receiving low amplitude change control or set point signals. A user interface is connected to the lead-lag input filter and enables an operator or other control personnel to view and change the operating characteristics of the lead-lag input filter to thereby provide the control loop with any of a number of desired response characteristics.
Abstract:
A control method comprises calculating a target value for at least one of a plurality of control parameters of a control target. The method also comprises performing feedback control of the control target in order for a value of a first of the control parameters to be set closer to its target value, and adjusting a target value of a second of the control parameters based at least in part on a deviation between the target value and a current value of at least one of the other control parameter.
Abstract:
A lead-lag input filter is connected ahead of a positioner feedback loop having one or more valve accessories, such as a volume booster or a QEV, to overcome slow dynamics experienced by the accessories when receiving low amplitude change control or set point signals. A user interface is connected to the lead-lag input filter and enables an operator or other control personnel to view and change the operating characteristics of the lead-lag input filter to thereby provide the control loop with any of a number of desired response characteristics.
Abstract:
To provide a valve controller which is convenient for users in that, even users without abundant experience and expert knowledge can obtain the optimum operation performance for a short period of time; and it can be prevented that control performance is caused to be deteriorated on the contrary in dependence on changing way of each coefficient. A valve controller 8 for controlling valve opening of an expansion valve 4 by calculating the valve opening such that a detected temperature (degree of superheat) Tsh coincides with a target temperature (degree of superheat) TS comprises: automatic tuning means for calculating a deviation e(t) between the detected temperature and the target temperature and for calculating changing amount of the valve opening m(t) by substituting at least the deviation and a set control parameter (PB, Ti, Td) into an arithmetic expression to automatically set the control parameter; and control level adjusting means for adjusting a magnitude of the valve opening calculated with the control parameter set by the automatic tuning means in stages in accordance with a set control level, and so on.
Abstract:
The invention provides control systems and methodologies for controlling a process having computer-controlled equipment, which provide for optimized process performance according to one or more performance criteria, such as efficiency, component life expectancy, safety, emissions, noise, vibration, operational cost, or the like. More particularly, the subject invention provides for employing machine diagnostic and/or prognostic information in connection with optimizing an overall business operation over a time horizon.
Abstract:
The invention provides control systems and methodologies for controlling a process having computer-controlled equipment, which provide for optimized process performance according to one or more performance criteria, such as efficiency, component life expectancy, safety, emissions, noise, vibration, operational cost, or the like. More particularly, the subject invention provides for employing machine diagnostic and/or prognostic information in connection with optimizing an overall business operation over a time horizon.
Abstract:
A method for optimization of operating parameters of a wind energy installation defines an upper and a lower interval limit value for a parameter to be optimized. The method includes carrying out a cycle with alternate operations of the wind energy installation with the interval limit values, with a data record in each case being produced with a target variable over a variable number of repetitions. The data records relating to the interval limit values are evaluated to form a quality measure, and the interval limit value with the poorer quality measure is identified. Then, at least the interval limit value with the poorer quality measure is replaced by shifting through a step value Δ in a direction of another interval limit value. The cycle is then repeated.
Abstract:
A temperature regulating apparatus includes a correcting operation unit configured a) to calculates a heat exchange amount of a heat exchanger, a logarithmic mean temperature difference or an average temperature in the heat exchanger, and a flow rate of a second medium, b) to calculate an overall heat transfer coefficient of the heat exchanger based on the heat exchange amount, the logarithmic mean temperature difference or the average temperature, and the flow rate of the second medium, and c) to correct a gain of a regulating operation unit based on a change in the heat exchange amount with a change in the flow rate of the second medium supplied to the heat exchanger.
Abstract:
Output feedback pole placement problems with parameter drift are solved with stabilizing solutions. Changes in system parameters trigger alerts in an automated manner. A representative method includes determining a set of solutions for an output feed pole placement problem, based on parameters of a physical system. The solutions are stable and well-conditioned for monitoring changes to the parameters of the physical system. The physical system is adjusted, or controlled, based on the solutions determined. Updated parameters of the physical system are acquired. A set of updated solutions for the output feedback pole placement problem are determined based on the updated parameters. The physical system is then adjusted, or controlled, based on the updated solutions determined. A system manager may also be notified of the updated parameters and/or the updated solutions. Furthermore, changes within the system may be monitored, and/or potentially critical changes within the system may be detected.