19results about How to "Suppress fluctuations" patented technology

The invention relates to the field of position sensors, in particular to a linear position sensor. The device comprises a shell and a support connected to the shell. The middle of the support is provided with a PCB, the bottom is provided with a magnet and a chip, and the top is provided with a metal terminal. The middle of the magnet is hollowed out, and a groove is formed in one side of the magnet for mounting the sensing unit of the chip; the chip is connected with one end of the PCB; and the metal terminal is connected with the other end of the PCB. Through collaborative innovation of a magnetic circuit, a circuit and a mechanical structure, comprehensive performance improvement of high precision, high reliability, strong anti-interference capability and wide environment adaptability is realized.

The invention relates to the technical field of aircraft control, and particularly discloses a disc-shaped fire extinguishing aircraft attitude control method based on visual localization, and the method comprises the steps: carrying out the analysis of the dense smoke distribution type in an edge precise region in the fire extinguishing process of the edge precise region of a forest fire through a fire extinguishing aircraft, and obtaining a fire extinguishing result; and when the dense smoke distribution type of the region is determined to be non-uniform distribution, carrying out high-temperature thermal distortion analysis on the edge precision sub-regions divided in the edge precision region, and screening out the high-concentration thermal distortion sub-regions and the low-concentration thermal distortion sub-regions, so that regions which have relatively large threats on visual positioning and flight safety of the aircraft can be accurately positioned, and the accuracy of the aircraft visual positioning and the flight safety can be improved. An aircraft operator or an intelligent control system can clearly know the danger distribution condition of a fire scene, and in the process that the aircraft enters the high-concentration thermal distortion subarea from the low-concentration thermal distortion subarea, data support can be provided for early warning of aircraft flight attitude adjustment.

The application discloses a left-right double-head laser automatic welding jig system and a welding method, relates to the technical field of laser welding, and is suitable for automatically loading two sheet metal bending pieces in a left-right balanced arrangement mode, and then performing laser welding on the left-right corner joint seams of the sheet metal bending pieces in the jig. The system comprises a jig body, an opening and closing mechanism, a seam-reducing and pressing mechanism, left-right double laser welding heads, a detection interlocking unit and a control unit. The jig body is provided with a bearing platform, a fixed reference piece and a center limiting piece. The sheet metal bending pieces are sleeved on the fixed reference piece. The center limiting piece is located between the two sheet metal bending pieces and presses the two sheet metal bending pieces outward in an elastic sliding mode. When the in-place state of the opening and closing mechanism and / or the seam-reducing and pressing mechanism and the gap value of the corner joint seam meet the preset welding conditions, the control unit triggers the left-right double laser welding heads to perform synchronous welding, and when the conditions are not met, the control unit implements ignition interlocking. Therefore, the stability of the corner joint seam and the welding quality consistency are improved.

The present invention addresses the problem of providing a monitoring device and a monitoring method capable of suppressing fluctuation of molten metal or gas entrainment into the molten metal by monitoring the shake of the molten metal in a plunger sleeve during a low-speed injection period at the initial injection stage of an injection molding machine and controlling the injection speed on the basis of the monitoring result. A monitoring device according to the present invention is provided with: an acquisition unit that acquires acceleration information of a plunger during an injection operation; a determination unit that determines the shake of the molten metal in the plunger sleeve on the basis of information relating to the acceleration in the direction of travel of the plunger from the start of injection of the molten metal in the plunger sleeve by the plunger to a predetermined period among the acceleration information; and an output unit that outputs the determination result of the shake of the molten metal.

The invention relates to the crossing field of mechanical engineering and process control, and discloses a dynamic dry-steaming calcination temperature self-adaptive control method for gypsum production. The method comprises the following steps: collecting material temperature, furnace body total mass, waste gas humidity and flow and heating power data in real time; the real-time equivalent specific heat capacity and the dehydration degree of the gypsum are estimated on line based on multi-source data; constructing and updating a dynamic thermodynamics prediction model; solving an optimal heating power sequence by adopting a model predictive control algorithm so as to accurately track a target temperature curve; and taking the condition that the real-time dehydration degree reaches a preset threshold value as a calcination end point criterion. According to the technical scheme, self-adaptive response to material thermal characteristic changes is achieved, and the temperature control precision, the energy efficiency and the product quality stability are improved.

This invention discloses an automated control method and system for the production of spandex spinning oil. The method uses a DCS (Distributed Control System) to detect and self-check the tank level, utilities, and pump / valve status. Upon successful self-check, production access is unlocked; otherwise, it is locked and an alarm is triggered. After unlocking, process parameters from the formula library are retrieved. Material is weighed via a variable frequency pump PID controller linked to a weighing sensor, and the feed flow rate is controlled by fuzzy PID, following the feeding sequence and timer intervals. The DCS issues a grinding command, collecting particle size data in real time; if the particle size does not meet the standard, the grinding time is extended until it does. Heating and stirring are initiated based on the mixing tank level signal, with timed temperature increases to the set value and then maintained. After the two processes are completed, the ground material is fed into the mixing tank for secondary stirring. Successful sampling triggers filling, with fuzzy PID controlling the filling flow rate. Once the liquid level is reached, the valve is closed, and a delayed cleaning process is initiated. After filling is complete, the entire line is shut down. This invention solves the problems of fixed PID control parameters and insufficient interlocking of all processes in traditional PID control methods.

The application discloses a heterogeneous network communication link determination method, a device network configuration method, device and system, and belongs to the communication field. The target matching degree of the available path is determined based on the evaluation indexes of signal strength, response time delay and power consumption, and the communication link with the highest target matching degree is taken as the target communication link. The weight is obtained by calculating the proportion and entropy value of the standard signal strength, standard time delay and standard power consumption respectively, the optimal value and the worst value are determined for the weighted index, the positive ideal solution distance and the negative ideal solution distance are calculated accordingly, and the closeness at the current moment is smoothed to obtain the smoothed closeness as the target matching degree, so as to suppress the fluctuation and make the link selection more stable. When the device is configured, whether it is the same type of device and the once configured device is judged according to the local historical network configuration record, if so, the latest network configuration record is directly used to speed up the access; after the network configuration is completed, the characteristics of the message are extracted, the protocol type is automatically identified, and the device access efficiency is improved.

The application discloses a kind of inhibiting to send air automatic control system and method of unit disturbance of powder feeder lower powder not smooth, including total air volume reference instruction formation loop, RB air volume reference instruction formation loop, total air volume reference instruction disturbanceless switching loop, oxygen amount correction loop, corrected total air volume instruction formation loop, modified variable load feedforward formation loop, limit before total air volume instruction formation loop and total air volume instruction formation loop.The application can reduce the fluctuation of furnace pressure, main steam temperature, reheater temperature and other parameters;Air supply control can be fully invested in automatic operation mode, greatly reducing the amount of operation personnel operation;When unit RB acts, it can quickly switch to the small value of RB target air volume instruction S6 and total air volume reference instruction S1, meet the air volume demand of RB process, while ensuring that air volume has no possibility of up-regulation;Avoid total air volume instruction to cause total air volume instruction to decrease too slowly due to RB process actual load drop too slowly, unstable combustion and other serious threats to safe operation of unit phenomenon.

The invention discloses an improved C-dump converter energy and signal simultaneous transmission strategy. In order to solve the problem that energy in a follow current stage of a traditional C-dump converter can only be fed back to an excitation power supply and power generation energy output cannot be realized, a follow current loop suitable for a power generation state is constructed by adjusting the connection position of an energy storage capacitor in a circuit, so that the control independence of each phase is maintained and the use of devices is not increased; and effective output of power generation energy is realized. The flyback converter is adopted to widen the voltage output range and reduce the output voltage fluctuation at the same time. In order to realize synchronous transmission of energy and signals, a frequency shift keying modulation method is used, and ripple signals containing communication data are embedded in output voltage; and a receiving end performs information demodulation by using fast Fourier transform, so that an information transmission system is simplified. According to the scheme, the system complexity is remarkably reduced, and the output electric energy quality of the switched reluctance generator is effectively improved.

This invention discloses a method and system for improving the stability of vehicle-mounted three-phase AC variable-speed constant-frequency power generation. First, the engine drives a permanent magnet synchronous generator (PMSG) to rotate, and the PMSG outputs variable-frequency and variable-voltage three-phase AC power. Simultaneously, a rotary transformer is used to detect the rotor position of the PMSG, obtaining first detection data. This first detection data is then decoded and fed back to the rectifier control unit. This invention decouples the three-phase active current i from the three-phase load current by using a transformation from a three-phase stationary to a two-phase rotating coordinate system in the phase angle of the three-phase command voltage on the inverter side. dfac With three-phase reactive current i qfac Then, both are fed back to the i in the rectifier-side SVPWM control. d and i q In the loop, a current loop feedforward is constructed on the rectifier side, thereby suppressing the fluctuation of DC side voltage when the AC load current changes abruptly, thus improving the stability of the DC bus voltage on the rectifier side, preventing inverter failure of the power generation system, and making it suitable for widespread promotion and use.

This invention provides a quantum computing method based on fuzzy processing, relating to the field of quantum computing technology. The method includes: inputting the fuzzy quantum state into a quantum circuit containing at least one quantum logic gate operation to obtain an output quantum state; performing continuous weak measurements on the qubits during the operation of the quantum circuit to obtain imprecise error information; processing the imprecise error information based on fuzzy mathematics to obtain error estimation parameters; generating and applying feedback operations to the qubits based on the error estimation parameters to suppress errors; measuring the output quantum state and determining the output result according to a preset probability threshold interval, where the probability threshold interval is used to distinguish different output categories. This invention can also be further combined with quantum error correction to achieve long-depth quantum computing using error correction methods, realizing effective quantum state stability control.

The present invention measures pressure responses for respective flow rates of a plurality of terminals, constructs a device learning model for predicting variations in terminal pressure, and performs optimal control of an air compressor. In a compressor control method facing a pneumatic system having a plurality of ends consuming compressed air, a control unit of the system 400: (a) a supply-side pressure is measured with pressure gauges 305-307 on a discharge side from which the compressed air is supplied; (b) pressure values and flow values at the time of opening or closing of valves are acquired using pressure gauges 113, 123,..., 243 and flow meters 112, 122,..., 242 provided at a portion of the ends of piping 11, 12,..., and valves 111, 121,..., 241, and (c) an end pressure prediction model for obtaining the pressure at each end 11, 12,..., 24 is learned using supply pressure values from air compressors 2-4 and pressure values and flow values at the demand side. During actual operation of the pneumatic system, the control unit calculates the optimal discharge pressure of the air compressor by inputting the supply pressure value and the air flow rate value of the end to the end pressure prediction model.

The invention relates to the technical field of material analysis, and discloses an on-line detection method and system for the expansion rate of expandable graphite, and the method comprises the following steps: applying instantaneous high-temperature stimulation to a powder sample to obtain an expanded graphite fluffy body; projecting a structured light field to the fluffy body and collecting a reflected light signal; decoding the optical signal, separating depth information and two-dimensional image information, and obtaining an effective three-dimensional data point set through space matching; performing triangulation processing based on the point set spatial topological relation, and constructing a triangular mesh; re-sampling the triangular mesh to obtain three-dimensional point cloud data, and respectively calculating a real-time accumulation volume and an original theoretical volume according to the three-dimensional point cloud data and the original mass and density of the powder sample; and finally, performing correlation analysis on the real-time accumulation volume and the original theoretical volume to obtain a real-time expansion rate value. According to the method, the accuracy of online detection of the expansion rate of the expandable graphite can be improved.

The invention relates to the field of power electronic converter control, discloses an ASD complex working condition management method and system based on a high-power active adjustable inductor, and aims to solve the problems of poor dynamic performance and short device service life caused by fixed passive filtering parameters of the ASD under the complex working conditions of three-phase imbalance, load switching, underload, overload and the like. According to the embodiment, an active variable inductor in which a positive inductor (such as a traditional physical inductor) and a negative inductor (equivalent to a single-phase inverter) are connected in parallel is adopted; the working condition state of the ASD at the current moment is recognized, then the negative inductance value is adjusted in a targeted mode, different working conditions are adapted, and the optimal filtering effect is achieved. The management method provided by the embodiment of the invention can flexibly deal with complex working conditions, improve the filtering performance, inhibit the DC side voltage fluctuation, prolong the service life of the capacitor, and improve the ASD power density and the operation reliability at the same time.

The invention provides a low dropout linear regulator and electronic equipment. A circuit comprises a transconductance amplifier, a reference branch, a main branch and a sampling feedback branch. One input end of the transconductance amplifier is used for accessing a reference voltage, and the other input end of the transconductance amplifier is connected with an output node of the reference branch; the reference branch comprises a reference transistor, the control end of the reference transistor is connected with the output end of the transconductance amplifier, the input end of the reference transistor is used for being connected with a power supply, and the output end of the reference transistor serves as an output node to provide reference voltage; the main branch comprises a main power tube, the control end of the main power tube is connected with the output end of the transconductance amplifier, the input end of the main power tube is used for being connected with a power supply, and the output end of the main power tube is used for outputting target voltage; the sampling feedback branch is used for sampling the load current of the main power tube and converting the load current into feedback current to be injected into the output node, so that the target voltage follows the reference voltage. By adding the sampling feedback branch, the precision can be improved.

The application discloses a motor control method, device and equipment and a computer readable storage medium, belongs to the motor control field, and considers that the voltage integral value of a specified phase can be changed by adjusting the triggering moment of a thyristor, so as to adjust the current effective value of the specified phase. Therefore, in the application, when three-phase voltage is unbalanced, a phase with the minimum current effective value is taken as a reference phase, a triggering moment adjustment value is determined for a next thyristor to be triggered of each non-reference phase, the triggering moment adjustment value is superposed on the original triggering moment of the corresponding thyristor to be triggered to obtain a target triggering moment, and finally the thyristor to be triggered is triggered at the target triggering moment. Therefore, the voltage integral value of the non-reference phase in the next half current period is consistent with that of the reference phase, the balance of the three-phase current effective value is realized, the fluctuation of the motor torque is inhibited, and the service life of the motor and the user experience are improved.

The application discloses a switching control method based on SPWM soft starting and a pulse type load LLC resonant converter. k The converter mainly comprises an LLC resonant converter, an H-bridge inverter circuit and a load thereof, and the control method is as follows: k For any positive integer, the load state is accurately judged through an H-bridge switching logic unit, and burst intermittent control and linear frequency control are respectively adopted in the no-load state and the full-load state in the steady state; when the load is switched, two-pulse optimal control is carried out by using a nonlinear SOTC optimal trajectory controller, so that the state is transitioned to a new mode along the shortest trajectory, and a dynamic response optimizer is introduced to compensate the frequency after switching according to the state radius error, so as to suppress voltage secondary fluctuation, solve the problems of slow dynamic response and large output voltage fluctuation of a traditional linear control facing the pulse type load LLC resonant converter, and improve the output voltage stability and anti-interference ability of the system.

The object of this invention is to provide a disk disk substrate that, although particularly thin, effectively suppresses head collisions by effectively suppressing undulations in the outer peripheral region of the disk surface. This invention provides a disk disk substrate in which, using scanning optical interferometry in multiple field-of-view regions located in the outer peripheral region of at least one side, the maximum value of the arithmetic mean height Sa specified in ISO 25178 is less than 0.50 nm in the mid-wavelength region via a Gaussian filter with a cutoff wavelength set to 1.0 mm, and the standard deviation of the aforementioned arithmetic mean height Sa is less than 0.10 nm.

The application discloses a kind of considering the motion control method of paddle drive unmanned vehicle of actuator dynamics, belong to unmanned vehicle formation control technical field.The existing paddle drive unmanned vehicle is difficult to effectively control in multi-modal switching and high dynamic operation.The geometric relationship between the follower and the follower is established to establish a tracking error model;Construct a finite time preset performance function embedded in overshoot and stable time and other classical control indicators, and perform error transformation through tangent function;Based on the backstepping method, an adaptive control law is designed, a first-order command filter is introduced to suppress calculation expansion, and RBF neural network is used to compensate model uncertainty and external disturbance online.While considering the physical limitations of the actuator, high-precision and strong-robustness motion tracking control of the paddle-driven unmanned vehicle in complex environments is achieved.