60results about How to "Solve the problem of control accuracy" patented technology

The invention discloses an aircraft track inclination angle control method based on a minimum parameter studying method. The aircraft track inclination angle control method comprises the following four steps; 1, analyzing and modeling a longitudinal aircraft control system; 2, controlling and designing a neural network dynamic surface based on the minimum parameter studying method; 3, testing tracking performance and regulating parameters; and 4, ending the design. In the aircraft track inclination angle control method, for a longitudinal aircraft model, an unknown function of a neural network approximating system is established; the number of parameters to be estimated is reduced by the minimum parameter studying method; the virtual control is gradually designed; a first-order low-pass filter is introduced in each step; and the neural network dynamic surface control is ultimately deduced. A differential explosion phenomenon in a reversal deduction control is overcome, and the rapid and accurate tracking of the aircraft track inclination angle on a preset track can be realized.

The invention discloses a bending fatigue testing method of a fiber reinforced material, comprising the following steps: step S1 of testing basic parameters and determining test conditions; step S2 of adjusting a test span; step S3 of setting a test compensation path; step S4 of determining the maximum stress; step S5 of carrying out a plurality of stress level tests to obtain a bending performance test and a stress-strain curve, finding dependent variables of corresponding stress values by means of getting points, and calculating a deflection value of strain corresponding to each stress based on a deflection value calculation formula; step S6 of setting test stress parameters; step S7 of carrying out bending fatigue tests at different times; and step S8 of linear fitting: drawing an S-N curve of test values by means of a regression linear analysis based on the test result in the step S7 by taking N as a vertical coordinate and S as a horizontal coordinate, and fitting out a fitted equation of log10(stress)=a-blog10(times) or (stress)=a*(times)<(-b)> based on the S-N curve. The bending fatigue testing method of the fiber reinforced material disclosed by the invention provides a method evidence for a bending fatigue test of the fiber reinforced material, and fatigue test life can be quickly obtained by the fitted equation.

The invention discloses a flow field precise control system for a DC transient impact type transonic wind tunnel and a control method, which belong to the technical field of wind tunnel tests, and aimat the problem that existing equipment fails and cannot be braked in time. The flow field precise control system comprises a control center computer, an attack angle control computer, a gate finger controller, a flow field controller, gate finger driving equipment and a pressure regulating valve electro-hydraulic system, wherein the gate finger driving equipment comprises a gate finger device, the grid finger device comprises two groups of gate finger sections arranged at upper and lower wall plates of a second throat of a wind tunnel super-expansion section, each group of gate finger sections comprises six wing-shaped gate finger pieces, each group of gate finger sections are respectively fixed on upper and lower gate finger trolleys, each gate finger trolley is provided with four columns of linear guide rails, and a servo electric cylinder is provided with a linear displacement sensor. Therefore, the purpose of precisely controlling a Mach number of the flow field of the DC transient impact type transonic wind tunnel is achieved; and the control method solves the problem of Mach number control precision within a range that M is greater than or equal to 1.0 and less than or equalto 1.2 by adopting a control mode integrating PID control and feedforward control for the gate fingers and performing optimized control over the flow field.

The invention particularly relates to an intelligent constant temperature and pressure water mixer for bathing, and a control method thereof. The water mixer comprises a hot water regulating valve, acold water regulating valve and a pressure increasing valve; the temperature of hot water, the temperature of cold water and the voltage of a water outlet are collected through sensors, and transmitted to a controller; the controller sends control signals to corresponding control circuits of the hot water regulating valve, the cold water regulating valve and the pressure increasing valve for controlling the opening degree of the corresponding valves, so that the constant temperature control over water is achieved; and through control over the rotating speed and rotating direction of the pressure increasing valve, the constant pressure control over output water is achieved. According to the intelligent constant temperature and pressure water mixer, water temperature and pressure are controlled through a closed loop control system, and the control of the water mixer is simple and reliable; complex algorithms and a powerful controller are not required; thus, the water mixer has less potential fault points, and the cost is lower; the temperature and pressure of warm water at the water outlet can be regulated accurately, so that the problems of complex manual temperature control and uneasy control are solved thoroughly.

The invention discloses a fast fluid flow control device, which comprises a sensor, an electromagnetic valve and a measuring device, wherein the measuring device comprises a microprocessor, a sensor circuit and an electromagnetic valve circuit, the sensor circuit is connected with the sensor and is used for receiving signals from the sensor; the electromagnetic valve circuit is connected with the electromagnetic valve and is used for adjusting the flux of the electromagnetic valve; and both the sensor circuit and the electromagnetic valve are connected with the microprocessor. The fast fluid flow control device effectively solves the control precision problems caused by errors and the interfered analog quantity in the process of digital analogue conversion, and can solve the problems of slow control speed and overshoot caused by reverse energy change of an actuating mechanism simultaneously; besides, the fast fluid flow control device can control the passing fluid flow precisely and achieve the flow control at high response speed.

The invention relates to a double-ring guidance method of skip re-entry, and belongs to the field of the guidance of the re-entry of aircrafts. According to the double-ring guidance method disclosed by the invention, the control precision of the guidance method to terminal distribution is improved by utilizing the prediction-correction executed by slow guidance tasks, and the problem that the control demand of high precision of skip re-entry is difficult to satisfy by only using the standard trajectory method is solved. According to the double-ring guidance method disclosed by the invention, the problem that the control precision of fall points is reduced by only using a prediction guidance method after the navigation precision deteriorates under large dynamic conditions is solved by utilizing a standard trajectory tracking method executed by fast guidance tasks. The prediction-correction executed by slow guidance in the double-ring guidance scheme disclosed by the invention solves the problem of the control precision of the secondary re-entry section under the conditions of initial large distribution.

The invention relates to an automatic circulation heat dissipation type linear motor motion control platform and a control method thereof. The automatic circulation heat dissipation type linear motormotion control platform comprises an upper computer, a lower computer controller and an automatic circulation heat dissipation device, the lower computer controller comprises a temperature control board card, and the upper computer communicates with the lower computer controller through an RS232 serial port line; the temperature control board card sends a control signal to an electric control valve in the automatic circulation heat dissipation device; a motor temperature sensor is installed in an area with the most obvious temperature heating of the motor rotor of the permanent magnet synchronous linear motor; the automatic circulation heat dissipation device comprises a cooling plate, the cooling plate is assembled on the upper side of the coil winding of the motor rotor in a surface-mounted mode, a cooling pipe is laid on the cooling plate, a cooling liquid inlet is connected with an external cooling liquid supply loop through an electric control valve, and a valve position sensor isarranged on the valve rod of the electric control valve; and the motor temperature sensor and the electric control valve are connected with the temperature control card. The platform solves the heating problem of the motor in different motion states, and the motion precision of the motor is improved.

The invention discloses a cement solidification strength ultra-early prediction method, and belongs to the foundation treatment and sludge solidification. The method comprises the following steps: determining a series of model fitting parameters unrelated to temperature and proportion by development related preliminary experiment at an investigation stage based on a strength increasing model in consideration of the cement solidification sludge under the temperature influence, and then sampling at the cement solidification sludge at the construction stage, and performing early strength acceleration testing under a predetermined high-temperature condition, and predicting the middle and late strength value under the cement solidification sludge construction environment based on the strength testing value under the early high-temperature condition. The cement solidification strength ultra-early prediction method, and belongs to the foundation treatment and sludge solidification disclosed by the invention is simple in operation and high in accuracy, the middle and late period strength prediction can be performed at the early stage of the construction, the early quality control of the cement solidification sludge filling engineering can be realized, the optimal mixing proportion at the construction field can be adjusted as early as possible under the guidance, the problem that the strength sampling inspection is substandard after the construction is finished can be effectively avoided, the curing agent cost and the later solidification cost can be obviously reduced.

The invention discloses a hydraulic control system and a method of a tension winch. The tension winch provides a loading function to a tested winch, and is connected with the tested winch through a cable. The tension winch can recover and release a rope, and the speed automatically follows up the tested winch; and the tension of the cable is kept near the user set tension. A hydraulic system of the tension winch comprises a high-tension control loop, a low-tension control loop and a cable arrangement control loop. The hydraulic system adopts the low-tension control loop when set tension is lower, so that the low-tension control precision and the highest speed requirement are guaranteed; the high-tension control loop is adopted when the set tension is higher; a variable pump is controlled to automatically adapt to the speed of the tested winch so as to achieve the effect of energy conservation; and the cable arrangement control loop is associated with a proximity switch of a cable arrangement mechanism to achieve a cable arrangement effect.

The invention discloses a closed-loop control system and a method for a mechanical arm device. According to the closed-loop control system of the mechanical arm device, position information of a mechanical arm load end (or position information of a positioning source on the load end) is utilized as feedback, so that closed-loop automatic control is realized, the control by all joints of the mechanical arm can cooperate with each other, the dependence on single joint control is reduced, and the problems of load end control precision and stability caused by changes of the length of connecting rods of the mechanical arm are solved. According to the technical scheme, a motion track of the load end of the mechanical arm is preset by utilizing the same-type positioning source which is not fixedon the mechanical arm device, a controller automatically records position coordinates of all points of the track, and sets the position coordinates as system expected positions one by one, and the load end of the mechanical arm device is made to move according to the preset track through the closed-loop control method. Further, a plurality of sound wave emitters are deployed on the positioning source, the position and the posture of the positioning source are determined according to the positions of the sound wave emitters, so that the position and the posture of the load end of the mechanicalarm device are determined.

The invention relates to a current waveform control system and method for a digital pulse power supply of an ion synchrotron. The system is characterized in that the current waveform control system comprises an ADC board, a state board, and an FPGA controller; the ADC board is used for acquiring a current signal and a busbar voltage signal of a digital pulse power supply in the ion synchrotron inreal time; the state board is used for determining the running state of the digital pulse power supply and controlling the startup, shutdown or reset of the current waveform control system; the FPGA controller is used for calculating an output current value point by point in real time according to an output waveform trigger case sent by the control system in the ion synchrotron and a plurality ofcurrent waveform data generated by an upper computer, converting the output current value into a PWM signal and sending the PWM signal to a main circuit driver of the digital pulse power supply; and real-time charging and discharging control is carried out on the busbar voltage of the digital pulse power supply according to the busbar voltage signal acquired by the ADC board, therefore the currentwaveform control system and method can be widely applied to the field of ion accelerators.

According to an automatic flow resistance control system for minimum flow, a small flow can be continuously measured in real time, and the measurement precision is high. According to the technical scheme, a positive displacement pump is communicated with a flow and flow resistance circulation loop formed by series flow pipes of a positive displacement flow meter, a differential pressure flow meter and an ultrasonic flow meter, and the flow and flow resistance circulation loop is connected with a PWM voltage converter through a single-chip microcomputer; and the single-chip microcomputer 1 realizes equal proportion conversion of a duty ratio PWM signal and a voltage signal through a PWM signal-to-analog signal module to form a direct current control voltage to drive a motor, the single-chip microcomputer selects a reading of a corresponding measuring range flow meter to directly drive a dual-mode PWM control circuit in a pump motor to adjust the rotating speed of the motor and a pump, the readings of the selected flow meter and the differential pressure sensor at the corresponding moment are collected at the tail of each time slice to form measuring points, then the measuring step length is automatically set according to the number of the input measuring points, and the measurement of the differential pressure and the flow in the measuring range is achieved.

The invention discloses a self-adaptive stability changing control method and system for a stability changing ship and a storage medium, and relates to the ship technology, and the method comprises the following steps: calculating the state information of a target ship at a moment t according to a motion dynamics model of the target ship; establishing a stable relative motion model according to the position and course information of the ship, the current advancing speed and transverse moving speed of the ship, the state information of the target ship and the motion dynamics model of the target ship and the ship; acquiring a position motion control rate and an attitude motion control rate; designing a forward controller according to the position motion control rate to calculate forward stabilizing force needed by the ship; designing a yaw controller according to the attitude control rate to calculate the stabilizing moment required by the ship; and controlling the ship according to the advancing stabilizing force and the stabilizing moment. The scheme does not depend on a ship model, stability changing control is independent of model damping dynamics, stability changing performance is guaranteed, and meanwhile the problem of control precision caused by interference of external wind wave flow to a control system can be solved.

The present invention provides a manipulator-positioning system, which comprises a manipulator, a cubical fixed mount and a signal-processing system; wherein, the manipulator can move within the range of a predefined space; the cubical fixed mount is mounted outside the predefined space. The manipulator comprises two arm parts and a rotary shaft part connecting the two arm parts together; wherein, the manipulator can rotate along the rotary shaft part; the rotary shaft part is provided with two camera modules, which can take a photo every certain time interval. Each three edges at any two diagonal positions on the cubical fixed mount are respectively provided with a row of illuminating indicators, which can periodically twinkle. The signal-processing system is used to process photos taken by the camera modules. The manipulator-positioning system can effectively acquire the absolute position of a clamped part and avoid accumulative errors.

The invention discloses an automatic gain control method of high-speed frequency hopping, which comprises the following steps that: a low-speed synchronous signal and a high-speed data communication signal are received by different channels, and the low-speed synchronous signal measures signal power in the process of synchronous receiving and sets an AGC initial value; a baseband demodulates the low-speed synchronous signal, if not, the synchronization fails, then the signal is judged as an interference signal, the AGC initial value is adjusted according to the power of the signal, if the synchronization is successful, the signal is judged as a target signal, and the AGC initial value is adjusted according to the power of the signal; and after the synchronization of the low speed synchronous signal is successful, the channel is switched to the receiving channel of the high-speed data communication signal. The invention improves control accuracy and control speed.

The invention discloses linear driving equipment which comprises a base, a lead screw transmission device, a sliding block, at least one motor and a monitoring device. The lead screw transmission device is arranged on the base; the sliding block is arranged on a nut of the lead screw transmission device; a rotary encoder is not arranged in the motor, and the motor is fixed at one end of the base and is in transmission connection with a lead screw of the lead screw transmission device to drive the lead screw of the lead screw transmission device to rotate, so that the sliding block moves in the length direction of the lead screw; and the monitoring device is a linear position encoder, is arranged between the sliding block and the base to monitor the sliding distance of the sliding block in the length direction of the lead screw, and is electrically connected with a driver of the motor, and starting and stopping of the motor are directly controlled through the driver. According to the technical scheme, on the premise that it is guaranteed that the linear driving equipment has large transmission mechanical force, the control precision of the linear driving equipment is improved, and meanwhile the precision problem caused by lead screw abrasion is solved.

The invention relates to the technical field of coal water slurry adjustment, and discloses a coal water slurry gasification intelligent adjusting system, which comprises a first detection module, a second detection module and a third detection module, wherein the first detection module, the second detection module and the third detection module are each provided with an output end and a feedback input end, the first detection module outputs a first measured value a1, the second detection module outputs a second measured value a2, the first detection module, the second detection module and the third detection module are all connected with a comparison module, the comparison module comprises a comparator, the output end of the comparator is connected with a controller, an actuator and a controlled object, and the comparison module is connected with a decentralized control module. According to the invention, the condition that a single cylinder or double cylinders of the high-pressure coal slurry pump do not dose within a short time is automatically handled, the automation degree is high, the control accuracy and timeliness are good, the safety is good, and catalyst failure and accidental shutdown accidents of the gasification furnace caused by coal quality changes are effectively avoided.

The invention relates to a working valve plate and an electro-hydraulic proportional multi-way valve, the working valve plate comprises a valve body and a valve rod, the valve body is provided with a first pressure channel and a second pressure channel which are communicated with a valve cavity, the working valve plate further comprises an electromagnetic valve assembly, and the electromagnetic valve assembly is used for controlling on-off of the first pressure channel and the second pressure channel. The valve rod is provided with a throttling groove distributed in the length direction, and the main oil inlet channel communicates with the first oil distribution channel and the second oil distribution channel through the throttling groove. According to the working valve plate and the electro-hydraulic proportional multi-way valve, the problems that according to an existing working valve plate, a valve rod is pushed to move in a manual mode, so that the operation comfort of the multi-way valve is low, and the control precision and the operation efficiency of the multi-way valve are reduced are solved.

The invention belongs to the technical field of data processing, and discloses an encoder position data processing and transmission control system and method and application. The position data processing and transmission control system comprises an absolute position calculation module, an absolute position splicing module, an absolute decoding module, an absolute position difference calculation module, a speed detection module, an absolute position data sending frame number selection module and an RS485 communication module. Through a communication coding optimization mode, the amount of dataneeding to be sent finally is reduced, the data sending time is shortened, and the working real-time performance and the control precision of the servo system are improved; and the problem that an encoder sends a large amount of data is solved, and the problems of insufficient real-time performance, control precision, working performance and the like of a servo system are solved. According to theinvention, the final amount of data needing to be sent by the encoder is effectively reduced, and the data sending time is shortened; and the real-time performance, the precision and the working performance of the whole servo system are improved.