30results about How to "Solve the problem of low control accuracy" patented technology

The invention discloses a control method and a device for a two-stage gas-supplementing and enthalpy-increasing system. Wherein, the control method includes: obtaining the target air supplement temperature of the two-stage air supplement enthalpy increasing system, wherein the target air supplement temperature is determined based on the evaporation temperature, the condensation temperature and the operating frequency of the compressor of the two-stage air supplement enthalpy increasing system; The target air supply temperature and the current air supply temperature of the two-stage air supplement enthalpy increasing system are used to adjust the opening degree of the electronic expansion valve of the two-stage air supplement enthalpy increasing system. The invention solves the technical problem of low control precision of the two-stage air supplement enthalpy increasing system in the prior art.

The invention discloses a method for setting parameters for predictive control of uncertain system model based on machine learning, comprising the following steps: 1) obtaining an m-dimensional output weight matrix Q and an n-dimensional input weight matrix R in the cost function of the system model predictive control; 2) Obtain the output sequence and mn×L 3 Group performance indicators, in which each group of performance indicators is a set of column vectors constructed from the output overshoot and adjustment time. For each group Q and R, the worst overshoot and worst adjustment time are obtained respectively, and then the The worst overshoot and worst adjustment time taken are stored in the matrix F; 3) Build an RBF neural network, and then use the established RBF neural network to calculate the optimal performance index; 4) Build a BP neural network, and then use the BP neural network to find Take the performance label; 5) Using the performance label as the basis for optimization, the PSO optimization algorithm is used to adjust the model predictive control parameters of the uncertain system. This method can more accurately realize the setting of the model predictive control parameters of the uncertain system.

The application relates to a computer room environment control system. The system includes: a monitoring module, a computer room control module and an air-conditioning unit; the monitoring module and the air-conditioning unit are connected to the computer room control module; the monitoring module is used to obtain multiple computer room state parameters; send the computer room state parameters to the computer room control module; the computer room state parameters It is a parameter used to characterize the operating state of the computer room; the computer room control module is used to obtain multiple computer room state parameters of the monitoring module; it is also used to comprehensively evaluate the multiple computer room state parameters to determine the required cooling capacity for the computer room; generate demand The cooling control command of the cooling capacity, and send the cooling control command to the air conditioning unit; the air conditioning unit is used to receive the cooling control command of the control module of the room, and adjust the cooling power according to the cooling control command, so as to adjust the indoor temperature of the machine room. The system can accurately control the environment of the computer room.

The invention relates to the technical field of material conveying, and proposes a horizontal material conveying device, including a material conveying platform and a pushing device arranged on one side of the material conveying platform, the pushing device is used to push materials on the material conveying platform, and the pushing device includes a The telescopic part on the support, the telescopic part includes several telescopic arms with different diameters, the telescopic arm with the largest diameter is the connecting arm, the telescopic arm with the smallest diameter is the push arm, and the other telescopic arms are the transmission arms, the first driving mechanism passes through the sprocket After driving the rigid chain to move, the encoder collects the rotation information of the sprocket, the rigid chain drives the push arm and the transmission arm to move in sequence, the rigid chain extends in the horizontal downward direction, and the brackets are rotated and set at the end of the telescopic direction of the telescopic arms at all levels , the rigid link is lapped on the bracket, and the push plate is arranged at the end of the push arm through a push-pull force sensor. The above technical solution solves the problem of low material position accuracy when the material is transported by the conveying device in the related art.

The invention discloses a sensing and heating method of high-magnetic induction oriented silicon steel, which belongs to the technical field of the heating of roll steel. The sensing and heating method comprises following steps that a high-magnetic induction oriented silicon steel plate blank is placed into a sensing and heating furnace to be controlled and heated in stages, basic voltage is set by an inverter on a starting heating stage, constant-voltage rapid heating is conducted, then a variation relation between the temperature of the plate blank and the voltage of the inverter is established, a temperature increase curve of the plate blank is set, closed-loop temperature increase is conducted by a temperature closed-loop controller according to the temperature increase curve, finally the closed-loop soaking control is conducted by adopting a variable-voltage temperature closed-loop controller, and the maximal soaking time is not greater than 30min. The stable and precise control of the temperature is fed back by a radiation high-temperature gauge through a temperature filter control technology in the heating process of the plate blank. Due to the adoption of the sensing and heating method, the problem that the control precision is not high under the temperature open-loop control mode and the control disturbance problem caused by the abnormal fluctuation of the temperature of the high temperature gauge occurred in the heating process can be effectively solved.

The invention discloses a damping type valveless hydraulic synchronous servo system, wherein a valveless system formed by combination of a servo motor and a variable pump is adopted to drive multiple hydraulic cylinders on a valveless hydraulic parallel synchronous loop, a sensor is adopted for each parallel branch to carry out data collection on speed, pressure and displacement, and a controller is used for carrying out contrastive analysis on data; in each parallel branch, a hydraulic cylinder on a first branch is a target cylinder, hydraulic cylinders on the rest branches are follow-up cylinders, frictional resistance devices are additionally arranged at the covers of the follow-up cylinders, and the movement speed of the output end of each cylinder is adjusted by the frictional resistance devices, so as to realize synchronization of displacement, speed and pressure. The system disclosed by the invention is environment-friendly and energy-saving, simple to operate and high in control precision.

The invention provides a voice control method and device for household electrical appliances. The method comprises that a remote controller is enabled to be connected to different household electricalappliances through controlling a rotary coding switch, control information is directly inputted by voice in the case of determining to control the currently connected household electrical appliance,and the household electrical appliance is selected without a need of inputting the household electrical appliance name by voice, thereby solving a problem of low control accuracy caused by the mode ofcontrolling the household electrical appliance by means of inputting the equipment name by voice in the related art, reducing the error rate of voice control, and ensuring the timeliness and accuracyof household electrical appliance control.

The invention provides a measurement and analysis method and device for autonomous landing of an unmanned aerial vehicle, as well as a control method and device. The measurement and analysis method for the autonomous landing of the UAV includes: obtaining stereoscopic image information of the area to be landed; obtaining relative position information according to the stereoscopic image information of the area to be landed, wherein the relative position information is the UAV and the Information about the relative position of the to-be-landed point in the to-be-landed area; determining the landing point of the UAV in the to-be-landed area according to the relative position information. Through the invention, the landing control precision of the drone is improved.

The invention discloses an efficient and convenient simple robot calibration method, which relates to the field of robot zero calibration; it comprises the following steps: 1) After installation, always keep the point of the measurement tool facing each other, manually teach the robot, and record the joints corresponding to N points data and joint axis data; 2) Construct a homogeneous matrix of each axis according to the joint axis data and then multiply them in sequence to obtain the overall homogeneous matrix; 3) Given the basic data, construct a forward motion homogeneous matrix based on the overall homogeneous matrix; 4 ) by adding the given error parameters to the joint data to obtain the joint angle matrix, and substituting it into the positive motion homogeneous matrix to obtain the error, and compensating it to the zero position of the robot to complete the calibration; The combination of instruments and software is complicated and costly, which leads to poor practicability of zero calibration, which leads to the problem of low robot control accuracy. It achieves zero calibration with pure software, improves practicability and achieves precise control.

The invention discloses a dual-three-phase permanent magnet synchronous motor control method for alternately executing sampling and control programs, and belongs to the technical field of power generation, power transformation or power distribution. By alternating the sampling time of the two sets of windings of the motor, the loading vector time and the reference value tracking time with half the sampling period, the present invention doubles the equivalent sampling frequency of the motor control system without changing the sampling frequency of a single set of three-phase windings. times, the control delay and prediction time span are halved. In addition, the present invention uses a two-layer model predictive control strategy to solve the problem of under-actuation in which the controlled dimension of the system is reduced to two dimensions and the control target is still four dimensions caused by the dual three-phase permanent magnet synchronous motor control method that alternately executes sampling and control programs . The dual-three-phase permanent magnet synchronous motor control method that alternately executes sampling and control programs provided by the invention effectively improves the steady-state and dynamic control performance of the dual-three-phase permanent magnet synchronous motor system, and reduces the calculation amount of the control algorithm.