638 results about "Control curve" patented technology

The invention discloses a non uniform rational B spline (NURBS) interpolation based speed smooth control method which comprises obtaining contour parameters of to-be-processed parts and cutting tool processing path according to the obtained contour parameters; utilizing five section S curve method and the space vector transfer method to conduct acceleration and deceleration planning and smooth transfer processing to the processing section of the cutting tool in the processing path, and then conducting interpolation processing to the processing section, so that processing path control signal of the cutting tool can be generated; processing the to-be-processed parts according to the generated processing path control signal of the cutting tool. The NURBS interpolation based speed smooth control method can not only guarantee the instantaneity and processing efficiency of numerical control machining, but also improve transfer speed and processing efficiency between tracks, and prevent mechanical shock on the corner of track section, so that machining precision is improved. Furthermore, only three stages of time of acceleration speed, uniform velocity and deceleration need to be confirmed, and whole section of acceleration and deceleration control curve can be constructed. The NURBS interpolation based speed smooth control method has the advantages of being simple in algorithm, easy to achieve and capable of being widely applied to the field of numerical control machining.

The invention discloses a control method of tandem cold rolling mill emulsion section cooling, comprising the following steps: a. collecting the device parameter of a rolling mill and the key parameter of band steel to be rolled; b. collecting a technological lubrication institution parameter; c. giving emulsion section cooling flow distribution initial value and iteration precision; d. calculating corresponding work roll thermal crown; e. calculating the lateral distribution value of a slipping factor; f. comparing the slipping factor maximum value with a critical value; g. calculating the lateral distribution value of a slip injury index; h. comparing the maximum value of the slip injury index with the critical value; i. calculating the corresponding strip shape distribution value; j. calculating the function value of a strip shape objective function; and k. judging whether Powell condition is available, and obtaining the control curve of the optimal section cooling flow. The controlmethod of the invention combines device section condition with practical flow control precision to set the emulsion flow in sections, reduces problems of slipping, hot slip injury and the like causedby lubrication and ensures the strip shape and the surface quality index of chassis outlet strip steel rolled stock.

The invention discloses a correction method for optimization of sliding pressure of a large steam turbine generator set of a power plant. The current research on optimization of the sliding pressure of the large steam turbine generator set operating under the low load to ensure that the generator set can operate with excellent performance under the sliding pressure during the low-load operation has great significance in improvement of the operating efficiency of the generator set. The correction method is characterized in that correction factors are adopted to correct the sliding pressure control curve of the generator set, that is, the relevance relation of the load of the generator set, the main steam pressure and the opening of the high-pressure regulating valve is expressed as Cn*Ng varies as Cp*P0*Cv. Since the specific correction factors are introduced for control elements, the load of the generator set and the main steam pressure of the control curve of the generator set under the sliding pressure in the sliding pressure deviation factor correction method, the invention ensures that the steam turbine generator is in the mode of operating under the best sliding pressure, andcan maintain the high operating efficiency of the generator set all the time.

A system for monitoring ablation size is provided and includes a power source including a microprocessor for executing at least one control algorithm. A microwave antenna is configured to deliver microwave energy from the power source to tissue to form an ablation zone. An ablation zone control module is in operative communication with a memory associated with the power source. The memory includes one or more data look-up tables including data pertaining to a control curve varying over time and being representative of one or more electrical parameters associated with the microwave antenna. Points along the control curve correspond to a value of the electrical parameters and the ablation zone control module triggers a signal when a predetermined threshold value of the electrical parameter(s) is measured corresponding to the radius of the ablation zone.

The invention belongs to the technical field of model segmentation in digital geometry processing, and discloses a method suitable for segmenting a dental triangle mesh curved surface from a dental jaw triangle mesh curved surface. The method integrates the three advantages of accuracy, high efficiency and smooth boundary, and finally realizes segmentation of the dental triangle mesh curved surface by the operations of interactive pickup of a dental jaw area to be segmented, primary segmentation of the increased area, automatic generation and accurate positioning of a spatial control curve, generation of segmentation line projection, smooth optimization of a segmentation line and the like.

The invention provides a working roller integrating functions of edge drop control and flatness control of strip steels. The working roller is implemented by grinding one side of a flat roll into continuous variable tapered structure. The tapered structure comprises three sections, wherein the first section is an edge drop control curve process section, the second section is an edge drop control tangent process section and the third section is a structural taper section. The edge drop control curve process section is tangent to the edge drop control tangent process section. The edge drop control tangent process section is intersected with the structural taper section. The invention achieves the smooth transition of the roll shape curve. Additionally, the working roller overcomes severe failures such as asymmetric stress on the roller due to the difference in wear damage of the upper and the lower working rollers and deviation of strip steel, asymmetry in edge drop control, and instable operations of edge trimming and breakage of strip steel during the edge drop control rolling process. Furthermore, the invention can continuously change the taper degree, facilitate the continuous control of the edge drop control of strip steels and avoid wave defects to ensure the edge flatness of strip steel.

The apparatus for cutting a flat glass work piece along a curved dividing line includes a laser generating a laser beam having a linear beam profile and an optical system with a scanner for producing a curvilinear focal point from the laser beam. The apparatus also moves a cold spot along the curved dividing line following the curvilinear focal point. A trajectory control device controls the position of the curvilinear focal point on the curved dividing line via actuators. A profile control device controls the contour of the curvilinear focal point according to trajectory data from the curved dividing line, so that all points of the curvilinear focal point lie on or coincide with the curved dividing line. The apparatus adjusts the length of the curvilinear focal point by adjusting scanning amplitude of the scanning motion.

The invention discloses a method for regulating train speed, comprising the steps of: acquiring target distance and line data; calculating the current external resistance by using the line data; modifying a predetermined target speed distance curve according to the external resistance and the target distance to obtain the current actual train control speed; and controlling the train speed according to the actual train control speed. The embodiment of the invention also provides a corresponding device. By prestoring an ideal train control curve which only takes the brake performance of the train into account without considering the external resistance, the actual train control speed can be obtained just by modifying the current train control speed in the ideal train control curve in each train control period, thereby reducing the calculated amount, shortening the train control period and ensuring the safe operation of the train.

A method and system for adaptively controlling a hybrid vehicle comprises a recorder for recording a historical load or duty cycle of vehicle during or after operation of the vehicle. A classifier classifies the historical load in accordance with a load category. A controller assigns at least one of a current control curve and a slew rate control curve associated with the load category for a defined time period after the recording of the historical load or if the vehicle is presently operating generally consistent with the load category. At least one of the current control curve and the slew rate control curve, or data representative thereof, are used to control an operation of an electric drive motor of the vehicle for the defined time period.

The invention discloses a pipe tool transportation mechanical arm, and belongs to the technical field of petroleum drill and exploitation equipment machinery. The pipe tool transportation mechanical arm comprises a guide rail, an upper mechanical arm and a lower mechanical arm, wherein the guide rail is installed on a girder of a tube draw bench, and the upper mechanical arm and the lower mechanical arm are installed on the guide rail. According to the pipe tool transportation mechanical arm, clamping pincers and righting pincers keep moving along the horizontal direction from beginning to end, displacement of a stand pipe is kept changeless in the vertical direction before and after a person grasps the stand pipe, and the person does not need to additionally regulate the vertical height of the stand pipe during the transportation process of the stand pipe. Furthermore, due to the fact that the upper mechanical arm and the lower mechanical arm adopt the same working principle, the person only needs to use the same control curve in control software for a first telescopic oil cylinder and a second telescopic oil cylinder under the condition that the first telescopic oil cylinder and the second telescopic oil cylinder are of the same specification, and then the purpose of respectively keeping stretching velocity and displacement of the upper mechanical arm and the lower mechanical arm synchronous is achieved. A control system of the pipe tool transportation mechanical arm is simple in programming and control, easy to implement and simple to debug, and therefore the pipe tool transportation mechanical arm is low in cost and simple to maintain.

A method for calibrating radio frequency includes collecting original sample point of radio frequency analog circuit, confirming curve fitting means according to control curve formed by original sample point and accuracy requirement of system, calculating out expression of curve model function according to curve fitting means and original sample point then generating calibration table of radio frequency according to expression of curve model function. The device used for realizing said method is also disclosed.

In described embodiments, a VCO based CDR for a SerDes device includes a phase detector, a VCO responsive to a first control signal and a second control signal and generating an output signal, a frequency calibration module configured to calibrate the frequency of the output signal by performing a coarse calibration and a subsequent fine calibration, a gear shifting control module controlling a gain, change of the first and second control signals in time, and a look-up table created by fine calibration values generated from the frequency calibration module, wherein the programmed variable gain of the gear shifting control module is calculated by a calculation circuit employing the fine calibration values stored in the look-up table, the calculation of the calculation circuit adjusts gear shifting down, and adjusts a gear shifting gain, and adjusting an overall CDR gain over a VCO control curve.