Abstract:
A system and method for monitoring freeplay within an actuator is provided. In accordance with various embodiments, the method includes collecting a plurality of actuator parameter data sets during a predetermined period. During the predetermined time period the actuator drive motor is commanded to extend and retract an actuator output ram operably connected to a movable component of a structural system such as a mobile platform. The method additionally includes selectively isolating various sets of the plurality of actuator parameter data sets that meet specific predetermined criterion. Furthermore, the method includes computing an amount of freeplay value within the actuator based on the isolated actuator parameter data sets.
Abstract:
The invention relates to a method for determining a deadzone angle ( δ ) of a backlash in a mechanical drive-train system (1), wherein the drive train-system (1) comprises a drive motor (2), a load (3) and a shaft (4) for connecting the drive motor (2) with the load (3), the method comprising the steps: estimating an interconnection torque ( T l ) in the deadzone, determining the deadzone angle ( δ ) depending on the interconnecting torque ( T l ) by means of an adaptive estimator, wherein in the adaptive estimator the backlash is modelled in terms of a variable stiffness ( K BL ) of the shaft (4).
Abstract:
A tuning system for improving operation of a plant. A server is coupled to the tuning system for communicating with the plant via a communication network. A computer system has a web-based platform for receiving and sending plant data related to the operation of the plant over the network. A display device interactively displays the plant data. A reconciliation unit is configured for reconciling actual measured data from the plant in comparison with a performance process model result from a simulation engine based on a set of predetermined reference or set points. The reconciliation unit performs a heuristic analysis against the actual measured data and the performance process model result using a set of predetermined threshold values.
Abstract:
Prior to processing, the amount of drift between a commanded position and an actual position at the time of inverting a shift direction is determined and stored in a memory of a drift controller (9). During processing, whether the sign of a shift command Pc is inverted or not is monitored. When inversion of the sign is detected, the amount of drift is added to the shift command so as to correct the shift command value. Then, the difference between the corrected shift command value and a position feedback Pf from a servo motor (5), that is, a corrected positional error Er effects position, velocity and current control (3), thus driving the servo motor (5).
Abstract:
A leadscrew driving arrangement which is corrected to eliminate the effect of pitch errors. The leadscrew (32) is mapped to create a table of differences between the leadscrew angular of a perfect leadscrew which has been advanced the same axial distance. The differences are used to create a correction table which is stored in a PROM (44). During operation of the leadscrew (32), the correction table is used to adjust the leadscrew driving signal.