47results about How to "Improve tracking control accuracy" patented technology

An optical disc apparatus has: an optical head 400 for emitting a light beam onto a predetermined track of an optical disc 300 before tracking control in order to detect reflected light with a photodetector; an arithmetic circuit 130 for generating measurement signals each indicative of a time-varying change of light received on a respective one of a plurality of light receiving areas of the photodetector; an A / D converter circuit 140 for A / D converting each measurement signal; a microcomputer 190 for determining a correction value based on a difference, in terms of high- and low-frequency components, between measurement signals having been A / D converted; and an adder circuit 180 for adding the correction value to a driving value output from a tracking control circuit 170, so that the driving value is corrected.

The invention discloses a modifiable tracking control method for images of hot-rolled plate blanks, and belongs to the field of automatic control. The modifiable tracking control method includes that an automatic modification function module, a first manual correction module and a second manual correction module are added in a 'tracking' program of a PLC (programmable logic controller), and corresponding manual correction operation buttons are added to a human-machine interface of a terminal in a field; when a plate blank within a certain confidence interval is detected by a hot metal detector in the field, large correction cycle is started by the PLC if the current actual position of the plate blank is inconsistent with the position of an image, so that the image of the plate blank is automatically modified; when finding that the image of the plate blank is inconsistent with the actual position of the plate blank, operators in the field can select image areas required to be modified and image modification directions via the corresponding buttons on a picture of the human-machine interface of the terminal in the field, so that a manual image position modification function can be realized. The modifiable tracking control method has the advantages that the actual position of the plate blank can be accurately reflected, the hot-rolled plate blank tracking control precision is improved, a technological process can be controlled effectively, energy consumption is reduced, the quality of products is improved, and the modifiable tracking control method can be widely applied to the field of automatic control for hot-rolling production processes.

The invention discloses a self-adaptive inverse tracking control method for a super-magnetostrictive tracking platform. The self-adaptive inverse tracking control method comprises the following stepsthat firstly, a left inverse model of a super-magnetostrictive actuator is obtained through offline identification; secondly, based on a Filtered-epsilon LMS algorithm, two completely identical nonlinear filters are used for copying the left inverse model of the super-magnetostrictive actuator; finally, an error signal obtained by output subtraction of the two nonlinear filters is utilized to finda controller in a self-adaptive mode, the weight coefficients of the filters are adjusted online by adopting the LMS algorithm till the output of the super-magnetostrictive actuator is identical to the output of a reference model, wherein the input of one of the two completely identical nonlinear filters is an object output, and the input of the other nonlinear filter is the output of the reference model. By offsetting the delaying portion of the super-magnetostrictive actuator, accurate tracking control of the super-magnetostrictive actuator is achieved.

The invention provides a double-close-loop nonlinear compound control method for a three-phase four-wire parallel APF (active power filter). A voltage outer loop adopts a sliding-mode PI composite nonlinear control algorithm, and a current inner loop adopts a repeated PI nonlinear control algorithm. The method comprises the steps as follows: firstly, a low-order system model of a dq coordinate system is established by synchronous rotation coordinate transformation, a PI feedforward decoupling controller is designed according to a dq DC model, a PI repetitive controller is designed based on internal model control, and a control output function of the PI repetitive controller of the current inner loop is established; in order to obtain a current reference value of the current inner loop accurately and quickly, a novel sliding-mode PI nonlinear control algorithm for DC side voltage is proposed, a sliding-mode surface switching function is designed according to an exponential reaching law form, and a control function of a sliding-mode PI controller of the voltage outer loop is established. With adoption of the outer loop sliding-mode PI compound control algorithm, the steady-state performance and the response speed of the DC side voltage can be improved, and voltage fluctuation is effectively reduced; with adoption of the repetitive PI nonlinear control algorithm, zero static error tracking of a current signal can be realized, and the tracking control accuracy of a harmonic compensation current instruction is improved.

The invention provides an artificial potential field path planning method and device based on obstacle classification for flexible needles, so as to solve the problems of uncertain planning paths and motion uncertainties of flexible needles in the prior art. The device of the present invention includes an image sensing system, a control system, an execution system and a host computer. Based on the device, the method of the present invention includes: the image sensing system obtains a real-time image of the flexible needle puncture environment, and recognizes target points and obstacles from the image, And classify the obstacles, and calculate the potential energy of each position point in the current environment based on the artificial potential field; the control system performs static path planning according to the curvature constraints and optimization indicators of the flexible needle path planning, obtains the initial path and the needle entry point, and then according to The image of the puncture environment collected in real time corrects the position points on the path, and sends control instructions to the execution system to control the movement of the flexible needle. The present invention can plan more feasible paths, and the real-time performance of path planning is better.

The invention discloses a path tracking control method, system, storage medium and terminal of an unmanned boat, wherein the path tracking control method of an unmanned boat includes the following steps: creating a relative velocity motion mathematical model of the unmanned boat in a state of ocean current interference Model; Generate the position tracking error of the unmanned ship based on the mathematical model and the principle of virtual point tracking; Create an adaptive line of sight law guidance law based on the mathematical model and the principle of line of sight; According to the position tracking error and the guidance The law guides the unmanned vehicle to track the desired path. The path tracking control method, system, storage medium and terminal provided by the invention have high path tracking accuracy and can track curved paths.