68 results about "Adaptive feedback control" patented technology

The invention relates to a distributed control method capable of improving the control precision of a flexible spacecraft and belongs to the flexible spacecraft control field. The method includes the following steps that: an execution mechanism and a sensor are installed at the same site of each of n arbitrary positions on the flexible spacecraft, and a dynamic model is established and is linearized, so that a linear time-invariant dynamic equation and a kinematics equation of a system can be obtained and are adopted as a controller design model; and an elastic rotation angle velocity and CMGs frame angle feedback control law is designed based on the Lyapunov theory, or the Lyapunov theory and direct adaptive control are combined together so as to design a desired reference model and a direct adaptive feedback control law. According to the distributed control method of the invention adopted, the vibration suppression of the flexible spacecraft can be realized based on the execution mechanisms which are installed in a distributed manner, and therefore, the vibration of the system can be converted into a stable state from a divergence state, and the control precision of the flexible spacecraft can be improved; and the estimation of the parameters of the system is not required in direct adaptive controller design, and high robustness can be realized, and therefore, the control precision of the flexible spacecraft can be further improved.

A HCCI engine with a model reference adaptive feedback control system maintains stable HCCI combustion during speed / load transitions by: (1) estimating the maximum rate of pressure rise (MRPR), for each cycle, from an extra-cylinder sensor metric, such as a crankshaft dynamics or knock sensor metric, via statistical vector-to-vector correlation; (2) periodically self-tuning the vector-to-vector correlation; (3) applying knowledge base models to guide cycle-to-cycle adjustments of fuel quantity and other engine parameters, to maintain a target MRPR value.

A fabrication process produces markers for a magnetomechanical electronic article surveillance system. The marker includes a magneto-mechanical element comprising one or more resonator strips of magnetostrictive amorphous metal alloy; a housing having a cavity sized and shaped to accommodate the resonator strips for free mechanical vibration therewithin; and a bias magnet to magnetically bias the magnetomechanical element. The process employs adaptive control of the cut length of the resonator strips, correction of the length being based on the deviation of the actual marker resonant frequency from a preselected, target marker frequency. Use of adaptive, feedback control advantageously results in a much tighter distribution of actual resonant frequencies. Also provided is a web-fed press for continuously producing such markers with adaptive control of the resonator strip length.