31results about How to "Improve control accuracy" patented technology

This utility model provides a stainless steel flange device, including a support base and a side bracket. A servo motor is installed in the middle of the upper end of the support base. The shaft end of the servo motor is connected and fixed to the flange table through a flange and bolts. Multiple support rods are installed longitudinally on the lower edge of the flange table. Multiple lower mold seats and multiple signal transmitters are fixed on the upper edge of the flange table. A side bracket is welded to the lower left side of the support base. This design solves the problem that the original thin-walled stainless steel flange device is difficult to adapt to the material characteristics of stainless steel and is prone to defects due to "deformation concentration and stress loss" in a single punching of the convex ring. This utility model adopts a semi-automatic drive structure, which can facilitate the two-stage punching and flanged of stainless steel pipes of different sizes. The "conical pre-punching + flat final punching" achieves controllable stress, improved accuracy and reduced defects through step-by-step dispersion of deformation. It is especially suitable for high-precision and multi-specification stainless steel flange scenarios.

This invention relates to the field of lighting control technology, specifically disclosing an environment-adaptive LED constant current energy-saving control method. The method includes: arranging a dielectric-photoelastic sensing array, a magnetostrictive-leakage flux detection coil, and a broadband impedance spectrum detection unit on the phosphor encapsulation layer, the inductor core, and the output bus, respectively; simultaneously acquiring three types of timing signals; extracting dielectric-magnetic-electric coupling degradation feature vectors; inputting the feature vectors into an energy-saving-lifetime co-optimization model; correcting the target luminous flux based on the dielectric relaxation offset; constructing a core loss-efficiency mapping surface to solve for the minimum energy consumption operating point; generating a constant current target value offset sequence and a PWM chopper phase-frequency co-transfer strategy; and simultaneously adjusting the duty cycle, switching frequency, and gate impedance through a feedforward-feedback composite adjustment network, and feeding back the current ripple spectrum and dielectric relaxation offset to update the feature vector weights. This invention achieves multi-physics field co-sensing and energy-saving-lifetime co-optimization.

The application discloses a low-vibration active phase modulation composite pulse tube Stirling cryogenic refrigerator and belongs to the technical field of cryogenic refrigerators. The composite refrigerator cold finger integrates a first Stirling component as a high-temperature stage and a second pulse tube component as a low-temperature stage. The innovation is that the phase modulation unit of the second pulse tube component is composed of a second inertia tube wound and fixed in the inner circle of the gas reservoir, and the gas reservoir is integrally connected to the first cold end heat exchanger to improve the system efficiency through low-temperature arrangement. At the same time, the motion state of the compressor piston and the first displacer is monitored and cooperatively controlled in real time through the compressor displacement sensor and the cold finger displacement sensor, active and accurate phase modulation is realized, and the active vibration damper is used to perform reverse compensation according to the motion feedback of the first displacer to significantly offset the vibration output of the whole machine. The application realizes the unity of high efficiency, low vibration and high reliability, and is particularly suitable for vibration-sensitive space exploration and other application scenarios.

The application discloses a measurement method, device, terminal, base station and storage medium, wherein the method comprises: a first terminal receives first signaling sent by a base station; wherein the first signaling is used for configuring first measurement resources available for the first terminal to perform CSI measurement; the first measurement resources are determined based on a first time slot; and the first time slot represents a time slot when a channel of the first base station is turned off or reopened.

This invention discloses a time-delay-resistant and energy-saving motion control method and system for a flat-type all-wheel-drive AUV. The invention includes: constructing a six-degree-of-freedom hydrodynamic model of the AUV based on submarine maneuverability theory; identifying the setpoint pure time delay and rotational acceleration characteristics of the propeller through multi-condition testing, and constructing a nonlinear propeller dynamic model including a pure time delay element and a nonlinear rotational speed dynamic response model; constructing a composite control architecture integrating a dual-loop PID controller, a Smith predictor, and a model reference adaptive controller (MRAC); using the Smith predictor to perform explicit time delay compensation for the vertical plane motion subsystem, and using MRAC to update the adaptive gain online to compensate for model mismatch. This invention effectively suppresses high-frequency pitch angle jitter, reduces ineffective commutation movements and energy consumption of the propeller, and significantly improves the high-speed operational stability and endurance of the flat-type AUV.

The application discloses a parallel RCM mechanism end effector for orthopedic surgery, which comprises two motors, three movement units, a double parallelogram linkage mechanism and a ball mill. The two motor axes are perpendicular and are installed on a base. The motor A is hingedly connected to the bottom end of the first movement unit; the motor B is hingedly connected to the bottom end of the second movement unit; the third movement unit is symmetrically arranged with the second movement unit and is hingedly connected to the base at the bottom end. The upper rod end of the double parallelogram linkage mechanism is hingedly connected to the top end of the second and third movement units through a rotating shaft; the lower rod end is hingedly connected to the three movement units through a rotating shaft. The upper rod and the lower rod are rotationally connected to the ball mill at the front ends. The double parallelogram linkage mechanism is used to make the center of the ball mill head coincide with the fixed point of the RCM mechanism, and the mechanism characteristic of the fixed point of the RCM mechanism is utilized. The fixed point is made to coincide with the ball center of the ball mill head, so that the position of the ball mill head is unchanged when the posture of the ball mill is changed, the posture of the ball mill does not affect the grinding process in the grinding process, the posture of the ball mill can be adjusted, the obstacle avoidance can be better realized, and the safety is improved.

This application discloses a robot control method, apparatus, device, and storage medium, relating to the field of artificial intelligence technology. The method includes: obtaining an estimated Jacobian matrix for the robot based on the robot's historical measured poses of its end effector and historical measured joint angles; constructing a quadratic programming equation for the robot based on the measured joint angles, measured poses, predicted pose sequences, desired pose sequences, predicted joint angular velocity sequences, predicted joint angle sequences, and the estimated Jacobian matrix at a target time; solving the quadratic programming equation to obtain the predicted joint angular velocities of the robot at the target time; and controlling the end effector to follow the desired pose at the target time based on the predicted joint angular velocities at the target time. This application can directly handle the robot's joint constraint problem and accurately execute pose following tasks for robots with unknown models, thereby improving the robot's control accuracy and versatility.

This invention relates to the field of intelligent control technology, specifically to an intelligent closed-loop control system coupling oxygen and carbon content with process parameters. The system includes a multi-parameter acquisition module, a parameter coupling deviation correlation data module, a priority-based soft-loop control command module, a detection frequency adaptation scheme module, and an intelligent closed-loop control execution command module. This invention, by real-time acquisition of multiple types of parameters and their classification with standard thresholds to establish an index, determines parameter deviations to uncover the causal mapping relationship between oxygen and carbon concentration and other process parameters. Priority-based soft-loop control commands are generated according to the deviation's impact weight. Stability is assessed by evaluating the time-series curve characteristics of the oxygen and carbon concentration after control, matching the sampling strategy, and correcting the weight coefficients to feed back into the control commands. This improves the accuracy of parameter control, enhances control stability, optimizes detection adaptability, and ensures stable operation of the production process.

The utility model relates to road construction technical field especially relates to a kind of sandstone multistage screening device for rural road construction, it includes sandstone screening cylinder for rural road construction, and multiple screening mechanism is provided in sandstone screening cylinder inside, and discharge assembly is provided on sandstone screening cylinder outer wall;Multiple screening mechanism includes first filter screen, second filter screen and third filter screen are sequentially provided in first filter screen lower side, and discharge assembly includes three discharge cylinders, gate is opened in discharge cylinder upper side, slide column is provided in discharge cylinder side, and three groups of lateral support plate are fixedly installed in slide column side edge.This utility model is equipped with multiple screening mechanism and discharge assembly, and three-stage filter screen is used to screen sandstone in turn, and various particle size sandstone is finely screened, to meet the needs of rural road construction, in addition, discharge assembly can timely export sandstone remaining on each filter screen, avoid filter screen blockage, improve screening efficiency.

The application discloses a kind of mechanical automatic transmission rotational speed synchronization self-adjusting predictive control method, comprising: the initial length of calculating brake combination signal sending to brake torque reaches constant value time point;Brake shaft speed drop value during brake torque constant time point is calculated to brake torque start to produce brake torque;Brake torque is zero during brake torque from constant brake torque start to reduce, and brake shaft speed drop value;According to the initial value of dynamic speed difference threshold value calculated according to the above results;Test the extreme value of brake friction plate separation torque reduction stage duration;According to the initial value of the extreme value of brake shaft speed curve parameter in separation torque reduction stage;According to the size relationship between the difference between the target speed of brake shaft before braking and current speed and dynamic speed difference threshold value, the rotational speed synchronization of transmission is controlled.The application improves control accuracy, shortens gear shifting time, improves gear shifting smoothness, enhances the robustness and stability of control method under time-varying working condition.

This invention discloses a control method and system for a solenoid valve. The method includes: controlling the operation of the solenoid valve based on preset control parameters, and acquiring vehicle operating data and solenoid valve response data; determining a target correction coefficient based on the operating data and response data; adjusting the preset control parameters based on the target correction coefficient to obtain target control parameters; and controlling the operation of the solenoid valve based on the target control parameters. This invention solves the technical problem of low control accuracy of solenoid valves in related technologies.

The invention discloses a multi-CA certificate synchronization and security management and control method and system supporting a national cryptographic algorithm, belongs to the field of information security and digital certificate management, and aims to solve the problems of poor adaptability, low synchronization consistency, coarse management and control granularity and low conflict resolution efficiency of the national cryptographic algorithm in the prior art. The method comprises the following steps of: completing bidirectional identity authentication among multiple CA nodes through a national cryptographic algorithm, and establishing an end-to-end national cryptographic security communication channel; preprocessing the certificate data to be synchronized; dividing hierarchical synchronization priorities based on certificate attributes and triggering a synchronization request; the receiving end CA node decrypts the verification data, and if certificate version state conflicts exist, a local certificate library is updated after automatic resolution is carried out through an intelligent conflict resolution method; and implementing multi-dimensional fine-grained security management and control based on the full-life-cycle attribute of the certificate. According to the method, the compliance and consistency of multi-CA certificate synchronization are improved, the control precision is enhanced, and the method is suitable for government affairs, finance and other high-security-demand fields.

A semiconductor terminal structure and its formation method are disclosed. The method includes: forming a hard mask layer on the surface of an epitaxial layer, comprising a first hard mask layer and a second hard mask layer located on the surface of the first hard mask layer, wherein the hard mask layer has a plurality of first openings, the width of the plurality of first openings gradually decreasing along a first direction, or gradually decreasing and then remaining constant; forming a plurality of first doped regions in the epitaxial layer using the hard mask layer as a mask and employing a first doping process; etching the first hard mask layer using an isotropic etching process using the second hard mask layer as a mask, thereby exposing one end of the top surface of the main junction region; and forming a second doped region in the epitaxial layer using a second doping process using the first hard mask layer as a mask, wherein the second doped region and the first doped region have a partially overlapping region, and the doping concentration of the overlapping region is less than or equal to the doping concentration of the main junction region. This structure can effectively reduce the terminal's occupied area, improve the process window, and improve the terminal's breakdown voltage.

The invention relates to the technical field of polymer synthesis and functional materials, in particular to polyvinyl butyral resin as well as a preparation method and application thereof. Through a continuous flow reaction method, reaction parameters are precisely controlled to realize extreme uniformity of a reaction microenvironment, and a specific catalytic system is further combined to realize precise'customization 'of the microstructure of the polyvinyl butyral resin, so that the stereoregularity of the polyvinyl butyral resin is stabilized in a better and narrower'gold' range, and the stability of the polyvinyl butyral resin is improved. The isotactic proportion is 8-10 mol%, the isotactic proportion is 3.5-4.5 mol%, and the beneficial stereoregularity is better. By utilizing the excellent mixing, heat transfer and residence time control capabilities of the continuous flow reaction method, the defects of extensive control of the tacticity of the stereotacticity and poor repeatability of the traditional batch method are overcome, excellent batch repeatability is obtained, and the standard deviation between batches is reduced from more than 1 mol% to less than 0.3 mol%.

The utility model provides a tenon-and-mortise joint bridge body structure based on a fixed bridge, which comprises a first bridge body arranged on a first abutment tooth, a second bridge body arranged on a second abutment tooth, and a connecting assembly arranged between the first bridge body and the second bridge body, and the connecting assembly comprises a first connecting groove formed in the first bridge body, and a second connecting groove formed in the second bridge body; the connecting lug is arranged at the position, corresponding to the first connecting groove, of the second bridge body, and the limiting part is arranged between the first connecting groove and the connecting lug. By adopting a tenon-and-mortise design mode, the problem that conventional bridge repairing is difficult to implement when a plurality of abutment teeth have large undercuts or have no common path of insertion is effectively solved, an adhesive is prevented from being directly exposed to an oral environment, the service life of a bridge body is prolonged, and the stability and reliability of a repairing effect are improved; the structure has the advantages of being firm in combination, attractive, natural and controllable in precision, the repair experience and the oral health level of a patient can be improved, innovativeness and practicability are achieved, and popularization and implementation are convenient.

This utility model discloses a loading lifting platform, belonging to the field of automated logistics equipment. The platform uses a lifting motor to drive a lifting rack to achieve the vertical movement of the lifting frame, and linear guides ensure lifting accuracy. An electric roller is used for cargo conveying, and push rods, driven by a push rod drive motor, push the cargo. A lateral drive motor enables the platform to move left and right. This utility model can automatically adjust its height and position to adapt to different truck compartments, replacing traditional manual adjustments, improving loading efficiency by over 90%, saving labor costs, and is suitable for automated logistics loading scenarios involving box trucks.

This application provides a robot motion control method, apparatus, robot, and storage medium, relating to the fields of artificial intelligence and robotics. The method, when determining the joint variable control parameters for controlling the robot's end effector from the current moment to the next moment, extends to N consecutive moments after the current moment. Considering the following error between the predicted task state and the reference task state at each of the N moments, the method aims to minimize the following error determined based on the reference task state and the predicted task state at each of the N moments. Based on these optimized joint variable control parameters, the robot is controlled to move to the next moment, improving the robot's control accuracy and effectiveness.

The application discloses a split type shearing ram for blowout preventer, which comprises an upper shearing ram assembly and a lower shearing ram assembly. The upper shearing ram assembly comprises an upper shearing ram body, an upper shearing cutter body and a first clamping plate. The upper shearing cutter body is in concave-convex cooperation with the upper shearing ram body and is connected through a fastening screw. The upper shearing ram body is connected with a first ram shaft through the first clamping plate. The lower shearing ram assembly comprises a lower shearing ram body, a lower shearing cutter body and a second clamping plate. The lower shearing ram body is in concave-convex cooperation and sliding connection with the upper shearing cutter body. The lower shearing cutter body is in concave-convex cooperation with the lower shearing ram body and is connected through a fastening screw. Meanwhile, the cutting edge of the lower shearing cutter body corresponds to the cutting edge of the upper shearing cutter body. The lower shearing ram body is connected with a second ram shaft through the second clamping plate. The first ram shaft and the second ram shaft are located on the same horizontal line. The application has low maintenance cost, good shearing stability, reliable connection, convenient disassembly and assembly and strong shearing capacity.

The utility model discloses a turnover type clamping mechanism for machining a disc brake of an electric vehicle, which relates to the technical field of turnover type clamping mechanisms and comprises a fixed mounting seat. The upper surface of one end of the fixed mounting seat body is fixedly connected with the main turnover mechanism, and the upper surface of the other end is slidably connected with the auxiliary turnover mechanism; an electric vehicle disc brake is arranged between the main turnover mechanism and the auxiliary turnover mechanism; the main turnover mechanism and the auxiliary turnover mechanism are correspondingly arranged and are partially structurally connected; according to the utility model, the base, the main support frame and the auxiliary support frame form a stable support system; the first pneumatic clamping jaw and the second pneumatic clamping jaw are matched from the two sides to clamp the electric vehicle disc brake, external force generated in the machining process can be effectively counteracted, it is guaranteed that the electric vehicle disc brake is stable and does not move in the machining process, the machining precision is improved, and the size precision and the form and location tolerance of all parts of the electric vehicle disc brake are easier to control within the standard range.

The invention relates to a neural network model training method and device, a neural network model calculation method and device, electronic equipment and a computer program product. According to the training method of the neural network model, the neural network model comprises a neural network layer, and the method comprises the following steps: dividing a target tensor in the neural network layer into at least two data blocks; for each data block, determining a corresponding public index according to the amplitude information of the elements in the data block; normalizing all elements in the data block relative to the common index to obtain a corresponding mantissa; for each element, only corresponding mantissa and sign bit are stored; the public indexes are stored according to data blocks, layers or channels; when the neural network model is trained, the public index, the bit width of the mantissa and the weight parameter of the neural network layer are updated through back propagation. According to the technical scheme, the requirements for the storage space and the memory bandwidth of the neural network model can be remarkably reduced on the premise that the precision is controllable.

The present application relates to the technical field of wheelchair control, and particularly relates to an electric wheelchair walking assisting control method and system based on road condition self-adaptation, which comprises the following steps: acquiring internal electrical signals and bilateral rotation speed feedback signals, collecting acceleration and angular velocity information of the wheelchair; performing fusion processing on the acceleration and angular velocity information to obtain a pitch angle; constructing an intention feature quantity reflecting a user's pushing intention and load change through an intention recognition algorithm to generate a reference assisting force; performing feedforward compensation processing on the reference assisting force to adapt to the type of the driving road to obtain feedforward compensation torques of bilateral motors; performing synchronization dynamic calibration on the feedforward compensation torques of the bilateral motors through a synchronization calibration algorithm; superimposing the reference assisting force and the calibrated feedforward compensation torques through a torque calculation model to obtain target torques and obtain motor control instructions. Through the fusion of motor operation parameters and IMU attitude data, the user's pushing intention is accurately recognized and the road condition is self-adapted, and the safety is significantly improved.

The present application relates to the technical field of coal mine underground gas extraction, in particular to a mine underground gas extraction drilling intelligent regulation method and device. The method comprises: S1: obtaining the gas concentration data of each drilling hole in the current coal seam to calculate the gas attenuation coefficient of the current coal seam; S2: calculating the predicted gas concentration at the future time based on the gas attenuation coefficient of the current coal seam; S3: calculating the predicted fluctuation range of each period in the future through the predicted gas concentration of the current coal seam at the future time; S4: based on the continuous real-time gas concentration data of the target drilling hole of the current coal seam, and calculating the average gas concentration of the target drilling hole in the current period; S5: comparing the average gas concentration of the target drilling hole in the current period with the predicted fluctuation range of the current period, evaluating the extraction state of the target drilling hole, and selecting the corresponding adjustment strategy to realize the valve adjustment of the target drilling hole. The present application can improve the accuracy and efficiency of drilling valve regulation in mine underground gas extraction.

The invention relates to the field of motor locks, and provides a motor lock which comprises a clamping hook assembly, a motor assembly and a rack assembly, the clamping hook assembly is rotatably arranged in the motor lock, and the rack assembly can be connected with the clamping hook assembly in a clamped mode; during unlocking, the motor assembly is powered on to drive the rack assembly to move in the direction close to the lock pin, locking of the rack assembly on the clamping hook assembly is relieved, the clamping hook assembly rotates in the unlocking direction, the clamping hook assembly and the lock pin are separated from each other, and unlocking is achieved. In the locking process, the motor assembly is powered on to drive the rack assembly to move in the direction away from the lock pin and drive the clamping hook assembly to rotate in the locking direction, so that the rack assembly is connected with the clamping hook assembly in a clamped mode, and the clamping hook assembly is locked to the state that the clamping hook assembly cannot rotate through the rack assembly; and meanwhile, the clamping hook assembly is clamped with the lock pin to realize locking. According to the motor lock, the clamping hook assembly, the motor assembly and the rack assembly are matched with one another, the unlocking thrust is enhanced, the working current is small, and the stability of the locking and unlocking process is improved.

The application discloses a flight control and load swing suppression method of a four-rotor unmanned aerial vehicle hanging load system, belongs to the technical field of unmanned aerial vehicle flight control, and aims at the influence of external environment uncertain factors, and proposes a robust control strategy based on adaptive multilayer neural network compensation disturbance estimator error, so that accurate tracking of a preset track is realized under the condition of load swing disturbance and wind disturbance; aiming at the accurate load transportation and dropping task demand, all states of the system are expressed by using flat output, a mapping relationship from the load movement track to the unmanned aerial vehicle movement track is established, so that the unmanned aerial vehicle drives the load to move in the expected track; aiming at the load swing existing when the system is in flight and the load residual oscillation existing when the unmanned aerial vehicle is in hovering, a load swing suppression technology based on a ZVDD shaper is proposed, so that the load swing is reduced.

The application discloses a control method of an injection nozzle in a vehicle. The method comprises the following steps: obtaining a circuit signal of a driving circuit of the injection nozzle during driving of the vehicle, wherein the circuit signal is used to represent a connection state between multiple components in the driving circuit; determining a fault type of the driving circuit in an abnormal connection state in response to the circuit signal representing that the connection state is the abnormal connection state; determining a driving channel for driving the injection nozzle from the multiple components based on the fault type; and controlling the driving channel to send a driving control signal to the injection nozzle to control the injection nozzle to perform an injection operation. The application solves the technical problem of low control accuracy of the injection nozzle in the vehicle.

This application discloses an active feedback polarization-maintaining fiber polarization stabilization device and method, comprising: a polarization compensation module disposed before the input end of the polarization-maintaining fiber to adjust the linear polarization direction of the incident laser; a polarization detection module disposed after the output end of the polarization-maintaining fiber to convert the output laser into multiple light intensity signals related to the polarization state; and a signal processing and control module connected to the polarization detection module and the polarization compensation module respectively, generating a normalized differential error signal based on the multiple light intensity signals, and generating a control signal based on the difference between the error signal and the target error signal value to drive the polarization compensation module to adjust the linear polarization direction of the incident laser in a closed loop, thereby continuously aligning it with the preset intrinsic axis of the polarization-maintaining fiber. This application suppresses optical power fluctuation interference through the normalized differential error signal, and combined with initialization calibration and closed-loop feedback control, can compensate for polarization deviations caused by environmental disturbances, mechanical drift, and long-term system operation in real time, thereby improving the polarization stability of the output laser from the polarization-maintaining fiber.

The application discloses a kind of access control management system, method and storage medium of transport vehicle, the system includes: first monitoring module, second monitoring module, card reading module, control module, access control module, wherein: first monitoring module is used to collect the first image dataset of target transport vehicle;Second monitoring module is used to collect first license plate image dataset;Card reading module is used to read vehicle tag dataset;Control module is used to determine target vehicle identification data according to first image dataset, first license plate image dataset and vehicle tag dataset;Obtain the target transport order data corresponding to target transport vehicle;According to target vehicle identification data and target transport order data determine target access control instruction;Access control module is used to execute corresponding access control action according to target access control instruction, to realize the access control management of transport vehicle.Adopt the application, improve the control precision of access control management system.

This invention relates to a precise control method for the head and tail thickening end control model of a tension reduction mill based on online speed feedback, belonging to the field of hot rolling technology for steel pipes in the iron and steel metallurgical industry. This invention addresses the technical problem of insufficient accuracy and stability in the head and tail thickening end control model caused by traditional methods relying solely on a heat detection device as a signal trigger point, which is susceptible to interference from roller slippage, water mist and vapor generated by the high-pressure water descaling device, and signal loss. The invention proposes superimposing a heat detection device and a speed measuring device at the roller table at the tension reduction mill inlet, far from the high-pressure water descaling device, with both located on the same horizontal coordinate. The speed measuring device monitors the steel pipe speed in real time and calculates the travel distance and arrival time at stand 1. Combined with signal verification and double-layer protection from the heat detection device, the calculation results of the original head and tail thickening end control model are automatically compensated, precisely controlling the dynamic CEC (Central Elongation Capacity) reduction process at the head and tail of the steel pipe during the tension reduction process. This method effectively avoids roller slippage and environmental interference, improving the metal yield.