30results about How to "Good control performance" patented technology

The invention discloses a stator flux linkage set method of brushless DC motor direct torque control, a given rotor flux linkage psif* and a given stator armature reaction flux linkage psia* are respectively set, and a given stator flux linkage psiS* is obtained by performing resultant vector on the above two parts. In the invention, the stator flux linkage set coincides with the running track of the stator flux linkage with an ideal control system, and the brushless DC motor direct torque control system has stable running and good control performance; the flux linkage set value can be dynamically and automatically adjusted along with the change of the working condition of the control system, thus inhibiting motor torque pulsation and improving running efficiency of the system.

The invention discloses a construction method for an FNN (fuzzy neural network) inverse controller of an AC (alternating current) electromagnetic levitation spindle based on rough set theory, comprising the steps as follows: taking a second derivative of a composite controlled object expected to output as input of an FNN inverse system based on the rough set theory, determining a basic structure of the FNN inverse system based on the rough set theory, selecting static experimental data, training offline the FNN based on the rough set theory to implement inverse of a composite controlled object model, constructing the FNN inverse system based on the rough set theory, constructing an inverse system of the composite controlled object by adopting an FNN inverse method based on the rough set theory, and coupling an AC electromagnetic levitation spindle system which is a nonlinear, strongly coupled multi-input multi-output system into a pseudo linear system. According to the construction method, independent control among 5 DOF (degree of freedom) offset variables of the AC electromagnetic levitation spindle can be implemented; meanwhile, better control performance and load disturbance resistance capacity can be acquired.

The invention discloses an SinCos coder based method for detecting a position and speed, comprising the following steps of: regulating a sine and cosine signal of the SinCos coder, then transmitting to a PG card, converting into a digital value by an AD sampling unit inside the PG card, and computing an accurate position theta r within a subdivided period by an MCU; enabling the sine and cosine signal to pass through a hysteresis loop comparison processing circuit to be converted into an A_PULSE signal and a B_PULSE which are transmitted to a QEP unit inside the PG card and for recording the rotated pulses number N of the SinCos coder; transmitting the rotated pulses number N and the accurate position theta r to the MPU through communication, and obtaining accurate position and speed information through simple computation by the MPU. The method enables a frequency converter to complete drive control under the condition that a synchronous motor is matched with the SinCos coder, and can accurately obtain the position and the speed, thereby showing better control property when an elevator starts at low speed and achieving very good embarkation quality without starting compensation.

The power consumption of a computer is dynamically managed independent of the OS or applications and without any delay time caused by system control. With respect to a blade server comprising, within one chassis: server blades 101 each comprising a processor 203, a power-saving control unit 201 and a power sensor unit 200; a power supply box 103 that supplies power to the server blades; and a single service processor 102, the service processor 102 defines an electric current consumption upper limit value in the power sensor unit 200 via the power-saving control unit 201 of each server blade. When the electric current consumption of the server blades exceeds the electric current consumption upper limit value, a signal 207 outputted by the power sensor unit 200 is communicated to the processor 205, the operating frequency of the processor is controlled, and the maximum average power is so controlled as to be at or below the power consumption upper limit value.

In the start up of the magnetic disk apparatus, the phase relation between servo information numbers recorded on the magnetic disk 15 in advance and the eccentricity of the magnetic disk is learned. In the positioning of the magnetic head, a signal generated by multiplying, by a weight coefficient, a sine wave or a cosine wave the phase the revolution frequency of the magnetic disk is fed forward as an eccentricity control amount, whereby the eccentricity is compensated.

The invention discloses a heating system for simulating the high-temperature and high-heat-flow environment on the ground. The heating system includes a U-shaped infrared lamp array, a water-cooled reflection module, a cooling water system, a power control system, a lamp array branch wire junction box, an upper computer and data acquisition equipment, the data acquisition equipment collects a heatflow value and a temperature value, the upper computer obtains a current value output by the power control system through the values, the power control system outputs the specified current value to supply power to the U-shaped infrared lamp array, the U-shaped infrared lamp array heats a specimen by means of thermal radiation and thermal convection, and the cooling water system flows through thewater-cooled reflection module to keep the temperature of each U-shaped infrared lamp within the normal working temperature range. The heating system can be used for high-temperature and high-heat-flow simulation testing under various environments such as the atmospheric environment, the vacuum environment, the vacuum low-temperature environment and the low-air-pressure environment.

The invention relates to a flat shovel height adjusting mechanism of a paddy field laser land leveler, and belongs to the technical field of agricultural paddy field tillage machines. The flat shovel height adjusting mechanism of the paddy field laser land leveler comprises a flat shovel blade, a flat shovel rotating frame, a suspension mounting frame, synchronous parallel rods, a synchronous motion frame, a height oil cylinder support, a height oil cylinder and a receiver installation rod. The flat shovel blade is fixed to the lower end of the flat shovel rotating frame. The upper end of the flat shovel rotating frame is hinged to the lower end of the suspension mounting frame. The height oil cylinder support is located above the flat shovel rotating frame, one end of the height oil cylinder support is fixedly connected with the suspension mounting frame, and the other end of the height oil cylinder support is hinged to the upper end of the height oil cylinder. The lower end of the height oil cylinder is hinged to the flat shovel rotating frame. The suspension mounting frame, the flat shovel rotating frame, the synchronous motion frame and the synchronous parallel rods form a parallelogram mechanism. The receiver installation rod is fixed to the synchronous motion frame. The flat shovel height adjusting mechanism of the paddy field laser land leveler has the advantages of being simple in structure and easy to control, improving the leveling precision, and not affecting the gravity center of the paddy field land leveler.

The invention discloses an adaptive robustness output feedback control method for a controlled emission platform, belonging to the electro mechanical servo control field. The adaptive robustness output feedback control method for the controlled emission platform comprises steps of establishing a mathematic model of the controlled emission platform, designing adaptive robustness controller for outputting the feedback, and performing a test on the stability of the adaptive robustness controller outputting the feedback. The adaptive robustness output feedback control method for the controlled emission platform performs estimation on inter-framework coupling coefficients of the controlled emission platform, effectively compensates the inter-framework coupling interference torque of the controlled emission platform, effectively observes the system velocity quantity by utilizing an high order sliding mode observer, solves the problem that the velocity quantity is not easy to obtain through the traditional ARC control method, and guarantees the good control performance of the controlled emission platform.

The invention discloses a five-order active disturbance rejection control method for a continuous rotary motor electro-hydraulic servo system, and belongs to the field of intelligent control. The control method comprises the steps of introducing a linear and nonlinear combined tracking differentiator, and proposing the design of an extended state observer for improving a nonlinear error feedback control law and a nonlinear compensation effect by using a terminal sliding mode surface. The invention has the advantages that the problems of parameter setting complexity, overlong operation time andthe like of the active disturbance rejection controller can be improved, and the response speed of a control system is increased; and for the continuous rotary electro-hydraulic servo motor system,the low-speed stability and the tracking precision of the continuous rotary motor can be improved, the frequency response of the system is expanded, and the precise control of the servo system is realized.

The invention discloses an expansion control set-based forecast flux linkage control method of a permanent-magnet synchronous motor. The expansion control set-based forecast flux linkage control method comprises the steps of performing mathematical modeling on the permanent-magnet synchronous motor; acquiring a virtual voltage vector of a terminal point arranged on a boundary of a space voltage vector hexagonal plane with regard to a stator voltage vector in a mathematical model, wherein the virtual voltage vector and a basic voltage vector form an expansion control set; acquiring an expansioncontrol set-based forecast flux linkage control model, employing a stator flux linkage vector as a control variable, and building a cost function according to influence of different control sets on stator flux linkage track within a sampling period, wherein an average value of the stator flux linkage reference track and actual track error which are calculated within the sampling period by an integral method is quantized by the cost function; determining optimal sector by cost function optimal dissolving, seeking optimal expansion voltage vector in the optimal sector, and performing amplitudeoptimization on the optimal expansion voltage vector.

The invention relates to a control method for reducing the traction pulsation of a linear induction motor. The control method comprises the following steps: obtaining actual primary magnetic flux linkage value, actual traction and average traction of the linear induction motor by measuring the DC bus voltage of an inverter and the primary phase current of the linear induction motor on line; and meanwhile, detecting the running speed of the linear induction motor in real time, and determining an inverter on-off signal to control the on-off action of the inverter by combining a control algorithm for reducing traction pulsation, an inverter on-off control table and a PWM modulation algorithm, thereby enabling the actual values of the traction and the primary magnetic flux linkage of the linear induction motor to track the given values quickly. The method can realize accurate and direct traction control on the linear induction motor, obviously reduce the traction pulsation of the motor and avoid the influence of end effect, parameter variation and the like on control performance.

The invention discloses an optical path switching device and switching method for an optical shutter of a high-power optical fiber laser. The device comprises a stepping motor, a stepping motor fixingblock, a base plate, a reflector holder, a reflector, a limiting rod, an electromagnet and an electromagnet fixing block, which are combined into a whole and installed in the optical shutter. The reflector is installed on the reflector holder, and the stepping motor rotates the reflector holder to complete the switching of an optical path. The limiting rod limits the rotation position of the reflector holder; a strong magnet is installed on the reflector holder to be combined with the electromagnet; via power on and off of the electromagnet, the position of the reflector holder can be fixed,and the repeated positioning accuracy of the same can be improved. According to the optical path switching device and switching method, the switching of the optical path of the optical shutter can bemore reliable, and the stability of the optical shutter of the high-power optical fiber laser can be improved.

The invention discloses a water emergency search and rescue system. The water emergency search and rescue system comprises the following use steps: 1, opening a computer of a control box, entering a system desktop, starting icons and opening control software; 2, entering a login interface of control software, and inputting a user name and a password for login; 3, entering a system operation interface after login is successful, clicking a +-shaped icon in front of the test icon by a left mouse button of the computer; displaying a test subdirectory, then double clicking the test subdirectory bythe left key of the mouse to change the color presented by the test subdirectory into purple, singly clicking a pull-down menu on the right side of the icon of the control equipment by the left key ofthe mouse, and selecting the test menu in the pull-down menu. The system is simple and convenient to operate, good in control performance, rapid in response and high in control effect on the pan-tiltcamera, the pan-tilt camera can be remotely monitored, the rotating angle and the pitching angle of the pan-tilt camera are controlled, real-time adjustment can be conveniently carried out accordingto the search and rescue working condition, and if a person falling into water is found, an alarm window automatically pops up.

The invention discloses a safe double-column hydraulic type automobile lifting machine, and relates to the technical field of automobile maintenance equipment. The safe double-column hydraulic type automobile lifting machine comprises a lifting machine auxiliary stand column, a limiting cross bar, a lifting machine main stand column and a hydraulic oil cylinder lifting pulley, wherein the liftingmachine main stand column and the lifting machine auxiliary stand column are both fixed to the bottom surface through anchor bolts, and a limit cross bar is fixed between the lifting machine main column and the lifting machine auxiliary column. A main control box is fixedly installed on the side wall of the one side, away from the lifting machine auxiliary stand column, of the lifting machine mainstand column. A hydraulic unloading valve arranged below the main control box is fixedly installed on the lifting machine main stand column through bolts, and a hydraulic oil tank is arranged on thehydraulic unloading valve. According to the safe double-column hydraulic type automobile lifting machine, an audible and visual alarm, a positioning laser transmitter, a hydraulic extension rod, a lifting tray, a height display and the hydraulic oil cylinder lifting pulley are arranged, so that the problems that personnel are prone to being injured due to the fact that an automobile and the like can drop directly when a lifting arm is damaged, and an automobile roof is prone to being damaged due to the fact that the safety performance is poor and the lifting height is not prompted are solved.

The invention discloses a soft crawling robot driven by a super-spiral polymer actuator. The device comprises a skin structure, a super-spiral polymer actuator, a return spring and a foot structure. According to the soft crawling robot driven by the super-spiral polymer actuator, the super-spiral polymer actuator and the return spring are arranged in parallel in a surface structure of the soft crawling robot with the advancing direction of the robot as the axis, and the surface structure is made of a polymer elastic material with telescopic deformation capacity. When the soft crawling robot ispowered on, the super-spiral polymer actuator generates heat to generate contraction action when powered on, and the left end of the soft crawling robot moves rightwards relative to the right end ofthe soft crawling robot under the limitation of the foot friction plates. When power is off, the super-spiral polymer actuator is cooled to recover to be elongated, and under the help of the return spring, the right end of the soft crawling robot moves rightwards relative to the left end of the soft crawling robot to rapidly recover to an initial shape.

The invention relates to system for taking toothbrush handles from a horizontal machine, shearing the toothbrush handles, placing the toothbrush handles into a vertical machine for secondary glue injection, and conducting casing. The system comprises a three-axis full-servo mechanical arm, an air shear jig, a rotating conveyer, a vertical injection molding machine, a three-axis full-servo truss robot and an automatic stacker. A plurality of toothbrush handles are grabbed through the three-axis full-servo mechanical arm from the interior of a mold opening die and then moved onto the air shear jig, stub bars of the toothbrush handles are sheared off through an air shear, and then the sheared toothbrush handles are placed on the rotating conveyer, cooled on the rotating conveyer and conveyed to an automatic feeding standby position of the vertical injection molding machine in the rotating process of the rotating conveyer; then, the toothbrush handles are grabbed and sent into a cavity of the vertical injection molding machine through the three-axis full-servo truss robot, and after injection molding is completed, the toothbrush handles are taken out and sent into a tray of the automatic stacker through the three-axis full-servo truss robot; automatic tray exchange is achieved through the automatic stacker, and then automatic casing is achieved. The system is high in automation degree, the usage rate of manpower is reduced, production efficiency is improved, and production cost is reduced relatively.

The invention discloses a double sunshade fabric blind automatic adjusting system for modern agricultural planting. The double sunshade fabric blind automatic adjusting system includes a body. Walls are mounted on the two sides inside the body, the right side of each wall is provided with an inlet, a ceiling is mounted at the top of the wall, a water outlet pipe is mounted below the ceiling, a water outlet is mounted at the bottom of the water outlet pipe, a keel is mounted on the inner wall of the ceiling, a sliding rail is mounted at the top of the keel, side plates are disposed on the two sides of the sliding rail, and auxiliary wheels are mounted on the side plates. According to the double sunshade fabric blind automatic adjusting system for modern agricultural planting, through the cooperation of a motor, a rotating wheel and a rotating shaft, under the action of a shading frame and a shading fabric, the motor is a stepping motor, the control performance is good, starting, shutdown and overturning are completed in a small amount of pulses, and shading can be performed effectively under the action of a sunshade fabric, so the indoor temperature is reduced; under the action of abaffle, the invasion of the rainwater to the motor and a bracket can be blocked, and the double sunshade fabric blind automatic adjusting system is suitable for popularization.

The invention discloses a distributed state feedback control method for the liquid level of a four-tank water tank. The method comprises that parameters of a distributed state feedback controller are initialized; a convex optimization problem composed of linear matrix inequalities is solved in an iteration manner, and optimal state feedback matrixes of sub-systems of a controlled object are solved; and the obtained optimal state feedback matrixes are applied to the corresponding sub-systems. Compared with centralized state feedback control, computing time of a controller is reduced under very low performance loss, and the safety, flexibility and reliability are higher; compared with dispersed state feedback control, the control quality is higher; and the distributed state feedback control method also has the advantages of high tracking speed, smooth tracking process, high anti-coupling performance and low stable-state error.

The invention provides an intelligent power distribution cabinet. The intelligent power distribution cabinet comprises an intelligent module arranged in the power distribution cabinet, wherein the intelligent module comprises a synchronous detection circuit, a digital microprocessor DSP and a control circuit, the synchronous detection circuit is used for transmitting a current signal and a voltage signal which are detected to the digital microprocessor DSP in real time, and the digital microprocessor DSP is used for sending a control instruction to the control circuit after judgment. The intelligent power distribution cabinet has the beneficial effects that the power distribution cabinet employs the high-performance digital microprocessor DSP, a clock circuit, an interface circuit and an analogue-digital AD conversion are abandoned, and the power distribution cabinet is simple in structure and has favorable control performance; moreover, the power distribution cabinet is flexible in equipment control, is safe and reliable, occupies small space, has the advantages of low maintenance cost, high reliability and low fault rate, and is convenient to operate.

The invention discloses an electric driving system of a double-system petroleum drilling machine. The electric driving system comprises a three-phase alternating current bus, a direct current driving system and an alternating current driving system; the output ends of the three-wire alternating-current bus are connected with the direct current driving system and the alternating current driving system; the direct current driving system comprises a plurality of direct current speed regulation units; and the alternating current driving system comprises a plurality of rectifying units, a plurality of alternating current frequency conversion units and a plurality of energy consumption braking units. According to the electric driving system of the double-system petroleum drilling machine of the invention, the advantages of the direct current driving system and the alternating current driving system are combined; and the problems that the direct current driving system is low in power factor, narrow in speed regulation range and the like are solved, the situation that the alternating current driving system is high in cost is comprehensively considered, and the technical economy of the drilling machine is optimal.

The invention discloses a lamplight system capable of maintaining stable illumination intensity. The system comprises a controller, a photoelectric coupler, a lamp bulb, a power source, a first variable resistor and a compensation unit; the input ends of the controller are connected with the power source and the photoelectric coupler; the output end of the controller is connected with the first variable resistor; and the compensation unit is connected between the controller and the lamp bulb. According to the lamplight system of the present invention, the first variable resistor is controlledthrough the controller so as to adjust lamplight to a comfortable brightness; when the voltage of the power source changes, the brightness of the lamp bulb changes correspondingly; the photoelectric coupler senses the change of illumination intensity, converts illumination intensity at this moment into current signals, and transmits the current signals to the controller; and the controller re-adjusts the first variable resistor, so that the brightness of the lamp bulb recovers. A traditional lamplight system will change with the change of voltage, excessively high or low voltage will lead to excessively bright or dark lamplight, and as a result, the lamplight will harm the eyes of people and affect the eyesight of the people, while, with the lamplight system of the invention adopted, the situation in the prior art can be solved.

The invention discloses an in-vehicle pressure fluctuation iterative learning control method and system under carbon dioxide constraint. The method comprises the following steps: initializing parameters such as a carbon dioxide volume concentration limit value; detecting the carbon dioxide concentration in the vehicle in real time, comparing the carbon dioxide concentration with a limit value, and determining whether to open a ventilation air duct, execute pressure control in the vehicle or obtain a pressure signal in the vehicle; the 1s change rate of the pressure in the vehicle is calculated for continuous comparison; further judging whether the air duct leaves the tunnel or not, if so, performing variable amplitude processing, control error calculation and variable scale processing, and correcting the air duct valve opening control quantity according to an iterative learning control algorithm; the system comprises a detection module, a signal acquisition and processing module, an evaluation module, an in-vehicle pressure fluctuation control module, an output module and a vehicle body ventilation system module. The system can meet the requirements for the in-vehicle pressure comfort and the in-vehicle fresh air amount at the same time, and has the engineering application value.

The invention discloses a topological circuit of a four-order voltage type inverter and a control method thereof. The topological circuit comprises an input circuit, an inverter circuit and an outputcircuit which are sequentially connected from an input end to an output end. The input circuit comprises a first switching device Q5, a second switching device Q6, a first diode D5, a second diode D6,a first inductor L3, a second inductor L4 and a first capacitor C3. The inverter circuit commonly used by the UPS is improved, so that the output waveform of the inverter circuit is more stable, theharmonic content is reduced, and the switching loss is reduced; and meanwhile, a control method based on a state space model is adopted to control the inverter circuit, the convergence speed is high,the error is small, the robustness is high, and the method has positive guiding significance for engineering practice.

The invention provides a commutation method for a modularized multi-level converter working in a quasi-two-level mode. The method comprises the following specific execution steps: judging the current commutation stage; and calculating and judging the magnitude of the sum to determine whether the bridge arm sub-module needs to be directly bypassed (or inserted) or not to act at the current moment. And repeating the step 2 until the commutation process is finished. And whether the current sub-module should be bypassed (or inserted) or not to act can be easily judged in a way of adding'one delay '. Besides, the method can quickly complete the commutation process, and as a delay always occurs in the early stage of the commutation process as much as possible, the change of the circulating current is maximized, and the circulating current reaches a reference value as soon as possible to complete the commutation process.

The invention relates to an information acquisition system for supermarket member purchase preference big data analysis. The device comprises a footstand and a recording mechanism, a seat groove is formed in the middle of the foot seat; a groove pad is fixed at the end part of the seat groove; lamp panels are connected to the left wall and the right wall of the base groove. The recording mechanismis mounted at the upper end of the footstand; an upper seat is mounted at the upper end of the recording mechanism; a sealing plate is arranged at the rear end of the upper seat; a display is mountedat the front end of the upper seat; the beneficial effects of the invention are that: according to the information acquisition system for supermarket member purchase preference big data analysis, theside blocks and the sliding block grooves slide; the base plate can be pulled out from the footstand; the base plate can be conveniently taken out to be operated and used, better regulation and control performance is achieved, some recording pens can be stored through an inner cylinder, paper can be stored through the hollow groove in the inner side of the base plate, an operator can convenientlyrecord big data needing to be understood through the paper and the pens, and the base plate is very practical.

A dual-redundancy reversing valve control system for a ship's hydraulic steering gear, which is composed of a dedicated controller, a motor driver, etc., can detect the working state of the valve, automatically switch the working mode, and receive application system instructions. The control system uses a stepper motor to replace the traditional solenoid valve to drive the dual-redundancy reversing valve of the steering gear. The controller can detect the relevant state of the valve in real time and precisely control the stepper motor to obtain excellent control performance.

The invention provides a deep reinforcement learning emergency control strategy extraction method for a power system. The method comprises: constructing observation data by introducing feature data of a power system node model at a plurality of historical moments; further constructing a deep Q learning network model, and performing optimization training by adopting a stochastic gradient descent optimization algorithm to obtain a power system emergency control deep reinforcement learning model; generating a data set in a specific fault scene based on the trained deep Q learning network model; training a weighted tilt decision tree model based on an information gain ratio on the data to complete strategy extraction; and setting a strategy fidelity index, a strategy actual control performance index and a model complexity index to evaluate model performance under different hyper-parameters, so that an optimal model is selected according to actual requirements and is used in the field of power system emergency control.

The invention relates to a PMSM harmonic suppression control method based on PWM and an improved quasi-resonance controller, and the method is characterized in that the SVPWM part of a PMSM is subjected to segmented PWM synchronous modulation, and the symmetry of three-phase PWM waves of a three-phase system is ensured; an improved quasi-resonance controller is adopted to further eliminate 6k + / -1 harmonic waves; performing resonant frequency correction on the three-phase system modulated by the improved quasi-resonant controller; a plurality of improved quasi-resonance controllers are connected in parallel, and harmonic waves of different orders are suppressed at the same time. Compared with the prior art, the method has the advantages that harmonic elimination in the full-rotating-speed range of the motor is achieved, and better control performance is achieved.

The invention discloses a model-free adaptive load frequency control method for a multi-region power system. The method comprises the steps of establishing a circuit system mathematical model, performing discretization analysis, performing secondary data analysis and performing load control. Compared with a conventional power system control method, the model-free self-adaptive control method for the LFC of the multi-region interconnected power system is provided for the first time, the method does not need any model information of the power system, does not need to measure any state signal of the system, has good control performance and certain robustness, and is good in independence; the method has the advantages of good external factor interference resistance and fault resistance, simple data driving control algorithm structure, small calculation amount and high calculation precision in the control process, thereby greatly improving the precision, reliability, automation and intellectualization of load power control operation of the power system.

The invention discloses a lamp light control system capable of automatically adjusting brightness. The lamp light control system comprises a controller, a photoelectric sensor, a lamp bulb, a power source, a first variable resistor and a compensation unit; the input ends of the controller are connected with the power source and the photoelectric sensor; the output end of the controller is connected with the first variable resistor; and the compensation unit is connected between the controller and the lamp bulb. According to the lamp light control system of the present invention, the first variable resistor is controlled by the controller, so that lamp light can be adjusted to a comfortable brightness; when the voltage of the power source changes, the brightness of the lamp bulb changes, and the photoelectric sensor senses the change of light intensity, converts the light intensity at this moment into current signals, transmits the current signals to the controller; and the controller re-adjusts the first variable resistor, so that the brightness of the lamp bulb recovers. A traditional lamp light system changes with the change of a voltage, so the lamp light will be too bright or too dark due to an excessively high voltage or an excessively low voltage respectively, and as a result, the people's eyes would be hurt, and the eyesight of the people can be affected, while, with thelamp light control system of the invention adopted, the problems of the traditional lamp light system can be solved.