85 results about "Intermittent control" patented technology

The invention relates to the field of intelligent medical treatment, in particular to a trauma grade evaluation method and device and a program product. The method includes: acquiring data of a trauma patient; transmitting the data to an evaluation model to obtain an evaluation result; a training process of the evaluation model comprises the following steps: acquiring a data set and a label of a trauma patient; the data set and the label are output to a neural network to be trained to obtain an evaluation model, parameter updating of the neural network comprises a first updating rule and a second updating rule, the neural network updates parameters by alternately executing the first updating rule and the second updating rule, and when the model performance of the neural network is lower than preset performance, the evaluation model is obtained. And suspending the iteration of the neural network through intermittent control, adjusting the proportion of the execution times of the first updating rule and the second updating parameter rule, and then carrying out iteration until the model is converged or the preset iteration times are executed. According to the method, the trauma degree of the patient can be efficiently and accurately given, and the method has good clinical value.

The invention discloses an H-infinity intermittent sampling load frequency safety control method for a multi-region power system under spoofing attack, and belongs to the technical field of power system safety control. According to the method, the intermittent control signal is only used in the working interval, the control cost is effectively saved, the limited network bandwidth can be saved through sampling control, and the influence of spoofing attacks on the multi-area power system is effectively resisted through safety control. Firstly, according to the characteristics of intermittent control and sampling control, the influence of spoofing attack is considered at the same time, and a multi-region power system intermittent sampling load frequency safety control dynamic model under the spoofing attack is established. Secondly, a switching Lyapunov functional is provided, meanwhile, under the framework of an LMI, sufficient conditions for existence of an intermittent sampling load frequency safety controller are given, and the conditions guarantee that the index of a multi-area power system is stable and meet the H infinity performance; and finally, verifying the effectiveness of the H-infinity intermittent sampling load frequency safety controller through three-region power system simulation under spoofing attack.

The embodiment of the invention provides a coupling network asynchronous dynamic intermittent safety control method and system, and the method comprises the steps: obtaining multiple attack signals comprising an injection attack signal and a replacement attack signal after building a dynamic model of a following network, a target network and a state error variable; and setting an intermittent controller according to the dynamic network model and the multiple attack signals, and setting a dynamic mechanism based on an exponential function to convert a state error variable into an interval control function. Wherein the interval control function is used for realizing security mean square synchronization control between the following network model and the target network model. According to the method, the asynchronous anti-attack intermittent dynamic cooperative control strategy oriented to the complex coupled network can be constructed based on an average intermittent control rate and dynamic event trigger threshold coupling method by utilizing a node self-adaptive dual spoofing attack probability model, and the problems of difficulty in multi-attack modeling and insufficient control strategy collaboration can be relieved.

The invention belongs to the field of aero-engine anti-icing system design, and discloses an aero-engine anti-icing system and a design method. The system comprises an anti-icing component, a heat supply structure, a control assembly and a monitoring assembly, wherein the anti-icing component selects an air inlet support plate and a rectification cover hood; the heat supply structure introduces air from two air flows of the combustion chamber and conveys hot air through a pipeline and an air collection cavity; the control assembly adopts intermittent control, and system management and control are achieved through a pressure reducing valve and a digital electronic controller; the monitoring assembly comprises a pressure sensor and a thermocouple. The design method sequentially comprises the steps of anti-icing component and type determination, anti-icing structure design, control scheme design, simulation analysis, test verification and the like. A complete forward design path is provided, the anti-icing efficiency is improved, the structure is simplified, safe and stable operation of the engine is guaranteed, and the method can be widely applied to design and improvement of an anti-icing system of the aero-engine.

The invention discloses a wide and thick plate hot working burner period intermittent control method considering input saturation. The method comprises the steps that burner heat supply controllable areas are divided according to burner distribution positions in the length direction of a wide and thick plate; on the basis of the operation time sequence of the wide and thick plate in the furnace, a burner heat supply controllable area distribution parameter model is established according to the temperature sensor distribution position and temperature information. And designing a burner period intermittent control method considering input saturation. And on the basis of a Lyapunov functional and a linear matrix inequality theory, calculating and designing sufficient conditions for finite time stability of a burner heat supply controllable area distribution parameter system under the control method. Through the steps, the temperature control performance of the heating furnace can be improved, sufficient combustion of fuel in the furnace is achieved, and it is ensured that wide and thick plates are heated evenly and the target temperature reaches the standard.

The invention discloses a temperature and speed intermittent control method for a hypersonic rocket vehicle. The method comprises the following steps: S1, establishing a dynamic model comprising a speed subsystem and a temperature subsystem of the hypersonic rocket vehicle; introducing an error variable, and converting the kinetic model into an error system model; establishing a coupling fuzzy error system model by combining a T-S fuzzy model and constructing a coupling state variable; s2, designing a discontinuous state observer and an intermittent feedback control signal of a hypersonic rocket vehicle system based on the coupling fuzzy error system model of the hypersonic rocket vehicle; in a stability analysis process, determining design parameters of the intermittent feedback control signal; and S3, performing intermittent control on the hypersonic rocket vehicle by using the intermittent feedback control signal. According to the control method, the control problem of the hypersonic rocket vehicle under the conditions that the state information cannot be completely measured and the communication bandwidth is limited is solved, and the control performance of the system can be ensured while the communication burden of the system can be effectively reduced.

The invention discloses a switching control method based on SPWM soft start and a pulse type load LLC resonant converter. The converter mainly comprises an LLC resonant converter, an H-bridge inverter circuit and a load of the H-bridge inverter circuit, and the control method comprises the following steps: setting k-level SPWM modulation in a starting stage to realize smooth soft start of output voltage (k is 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 adopted for no-load and full-load in a steady state respectively; during load switching, a nonlinear SOTC optimal trajectory controller is adopted to perform two-pulse optimal control, so that the state is transited to a new mode along the shortest trajectory, and a dynamic response optimizer is introduced to compensate the switched frequency according to the state radius error so as to suppress secondary voltage fluctuation. The problems of slow dynamic response, large output voltage fluctuation and the like when traditional linear control faces a pulse type load LLC resonant converter are solved, and the stability and the anti-interference capability of the output voltage of the system are improved.

The invention discloses a modeling and control method and system for industrial factory building air conditioner load optimization prediction. The method comprises the steps that indoor and outdoor parameter data of an air conditioner system in each area of an industrial factory building are collected; according to a thermal comfort index-predicted average value pwv model and the parameter data, determining the thermal comfort of each area; according to the thermal comfort degree state of each area of the industrial factory building, a preset event triggering control strategy and a controller, the control strategy of the current air conditioner and the state of the controller are determined; according to the current control strategy of the air conditioner and the state of the controller, an intermittent control strategy of the controller is determined, and the intermittent control strategy is divided into a control interval and a non-control interval; and inputting the data of the control interval and the non-control interval into a pre-constructed physical information neural network model to obtain the predicted energy consumption of each area of the industrial factory building. And the air-conditioning system load prediction level is effectively improved.

The embodiment of the present application provides a method and system for asynchronous dynamic intermittent safety control of a coupled network. The method can obtain multiple attack signals including injection attack signals and replacement attack signals after establishing a dynamic model of a follower network, a target network, and a state error variable, and set an intermittent controller according to the dynamic network model and the multiple attack signals, and then set a dynamic mechanism based on an exponential function to convert the state error variable into an interval control function. The interval control function is used to achieve safe mean square synchronization control between the follower network model and the target network model. The method can utilize a node-adaptive double deception attack probability model, based on the average intermittent control rate and the dynamic event trigger threshold coupling method, to construct an asynchronous anti-attack intermittent dynamic collaborative control strategy for complex coupled networks, which can alleviate the difficulties in modeling multiple attacks and the lack of coordination of control strategies.

The invention discloses an intelligent networked vehicle group formation control and intermittent control method in a zero-trust environment, and particularly relates to the technical field of information security, and the method comprises the steps: building a state-space equation of an intelligent networked vehicle according to a dynamic model and a communication topological structure of a leader-following vehicle formation system containing a zero-trust framework and measurable noise; the consistency control problem of a single follower vehicle and a leader vehicle in the system is converted into the stability problem of an error system; designing an augmented system by using the system state and measurable noise, and designing an observer to realize estimation when part of the system state is unmeasurable and interference exists; defining an event triggering strategy during the control interval, designing a triggering function and obtaining a triggering threshold value; an intermittent control protocol is designed according to system state information, and the designed observer and controller complete state monitoring estimation and coordination control.

The invention discloses a simple intermittent quantization control method of a Chua's circuit system. According to the method, firstly, an estimation algorithm based on indirect signals is designed to be used for estimating unknown states and disturbances in a network system, and then two threshold functions are designed to be used for constructing a non-periodic intermittent control strategy. The uniform quantization controller is used to quantize a control input of the system to reduce transmission of redundant control signals. The method is applied to a Chua's circuit system, the unknown state and disturbance estimation effect is good, and system control resources are effectively saved.

The invention belongs to the related technical field of power electronic converters, and discloses an LLC resonant converter light load smooth transition control method and system, and the method comprises the steps: carrying out the PI calculation according to the real-time output voltage of an LLC, and obtaining a pre-output frequency; if the pre-output frequency is greater than or equal to the maximum output frequency, entering a second working mode; at the moment, the actual output frequency is set to be the maximum output frequency, and the duty ratio of intermittent control is set according to the exceeding degree of the pre-output frequency relative to the maximum output frequency; a PFM modulation signal is generated according to the actual output frequency, a burst signal is generated according to the intermittent control duty ratio, and a driving signal is generated according to the PFM modulation signal and the burst signal to control the LLC resonant converter. The control requirements of the PFM modulation mode under the normal working condition and the burst mode under the light-load working condition can be met by using one set of PI control parameters, and smooth transition of light-load control is achieved.

The application discloses a generator lithium battery cooperative control method and system, and belongs to the technical field of electric control of hybrid electric vehicles. The method collects lithium battery current, SOC state and temperature data in real time, establishes a dynamic Imax threshold after standardization processing, constructs a multi-physical field coupling model, accurately calculates the high-power duration of the generator and outputs optimal intermittent control parameters, realizes intelligent cutting and recovery of the charging loop through MOSFET switches, collects operation data to feedback and optimize model parameters, and forms a closed-loop learning system. The application solves the technical problems of response lag and split electric heat management of the traditional method, realizes double-target optimization of the extension of the service life of the generator and the improvement of the charging efficiency of the lithium battery, reduces the daily average high-load time of the generator, and improves the cycle life of the lithium battery.

The invention relates to a multi-mobile-robot intermittent formation tracking control method for denial of service attack, and belongs to the technical field of multi-mobile-robot control. Aiming at the problems of poor anti-interference performance, waste of communication computing resources, uncontrollable convergence time and strong model dependence in the prior art, a remote control terminal and ultrasonic radio station cooperative anti-attack switching scheme is provided, a distributed observer is adopted to realize leader state estimation, resource consumption is reduced by combining intermittent communication and an intermittent control mechanism, and the reliability of the system is improved. And a preset time adjustment function ensures user-defined convergence, and a reinforcement learning network optimization control strategy is introduced. The anti-attack capability and the self-adaptive performance of the system are improved, high-precision formation tracking is realized, the communication and calculation burden is remarkably reduced, and the expansibility is high.

The invention discloses a self-triggering self-adaptive dynamic programming method based on model prediction, which belongs to the field of optimal control, and comprises the step of developing a self-triggering self-adaptive dynamic programming algorithm based on an iterative model prediction process for an unknown nonlinear system. A trigger condition function is designed through Lyapunov stability analysis, intermittent control only depending on the previous trigger state is achieved, and communication traffic is reduced. A three-network architecture composed of a model network, an evaluation network and an execution network is designed. Then, a rolling optimization mechanism is provided, infinite time domain optimization is decomposed into finite time domain sub-problems, and calculation time consumption is reduced; and finally, providing a simulation result to verify the effectiveness of the proposed method.

Disclosed in the present application are a control circuit and a control method for a resonant converter, and a storage medium. The control circuit comprises: a detection module, which is configured to detect an input signal and an output signal of a resonant converter; a control module, which is configured to determine a target switching frequency, a target intermittent control duty cycle and a target intermittent control period of the resonant converter on the basis of the input signal, the output signal, and a target output voltage of the resonant converter, and generate a first PWM signal, a second PWM signal and a third PWM signal; and a driving module, which is configured to control the intermittent operation of a switching tube in the resonant converter on the basis of the first PWM signal, the second PWM signal and the third PWM signal, such that the output voltage of the resonant converter converges to the target output voltage. The solution of the present application can not only improve the stability of the output voltage of a resonant converter, but can also efficiently and accurately realize the efficiency optimization of the resonant converter under different load conditions.

A DCDC converter that suppresses an inrush current flowing to a capacitor is provided. A DCDC converter (1) includes: first and second capacitors (C1, C2) provided between a reference conductive path (93) and one of first and second conductive paths (91, 92); first and second cut-off switches (71, 72) interposed between a first external power supply (61) and the first capacitor (C1) and between a second external power supply (62) and the second capacitor (C2); and a control unit (12) that switches the first and second cut-off switches (71, 72) between an on state and an off state, wherein, in a case where a switch from cut-off control that maintains the first and second cut-off switches (71, 72) in the off state to energization control that maintains the first and second cut-off switches (71, 72) in the on state is performed, the control unit (12) performs intermittent control that intermittently places the first and second cut-off switches (71, 72) in the on state before the energization control.

The invention relates to the technical field of vehicle communication, in particular to an intermittent control method for an intelligent traffic unmanned vehicle communication network, and the method comprises the steps: carrying out the precise modeling of the unmanned vehicle communication network of an intelligent traffic system through employing a positive complex network model, so as to obtain a state space model, and then assuming an isolated node, and communicating with other network clusters to realize information interaction. And secondly, by designing an observer and a periodic intermittent control protocol thereof, the unmanned vehicle communication network of the intelligent traffic system can normally achieve synchronization without real-time communication, so that the stability of the unmanned vehicle communication network under various actual conditions is ensured, and the control efficiency of each unmanned vehicle is improved.

The application discloses a kind of H∞ intermittent sampling load frequency security control method of multi-area power system under deception attack belongs to the technical field of power system safety control.In the application, intermittent control signal is only used in working interval, effectively save control cost, sampling control can save limited network bandwidth, and safety control effectively resists the influence of deception attack on multi-area power system.Firstly, according to the characteristics of intermittent control and sampling control, while considering the influence of deception attack, the dynamic model of intermittent sampling load frequency security control of multi-area power system under deception attack is established.Secondly, switching Lyapunov functional is proposed, and sufficient condition for the existence of intermittent sampling load frequency security controller is given in the framework of LMI, which guarantees the exponential stability of multi-area power system and meets H∞ performance.Finally, the effectiveness of the proposed H∞ intermittent sampling load frequency security controller is verified through simulation of three-area power system under deception attack.

The utility model relates to the technical field of material storage, and discloses a dry material storage bin which comprises a storage box, a quantitative dustproof mechanism is installed on one side of the storage box, the quantitative dustproof mechanism comprises a slidable lifting plate, one side of a rack plate is meshed with a driving gear which is driven intermittently, and the rack plate is provided with a rotary shaft. The driving gear is driven by the output end of the motor on the supporting frame to rotate anticlockwise, the driving gear is intermittently meshed with the rack plate on one side through rotation, and the lifting plate below the rack plate is driven to move upwards; the compressed springs on the two sides can push the lifting plate to rapidly move downwards under the counter-acting force, the effect of controlling intermittent discharging of the discharging plate is achieved through sliding of the lifting plate in the mounting plate, the discharging amount and frequency can be adjusted according to production requirements through intermittent control, accurate control over the discharging amount can be achieved, excessive or insufficient discharging is avoided, and the production efficiency is improved. And the production line runs more smoothly.

The invention discloses a self-adaptive complex network fixed time synchronization method based on periodic intermittent control, and relates to the technical field of complex network synchronization control, and the self-adaptive complex network synchronization method comprises the steps: building a complex dynamic network model comprising a plurality of same linear coupling nodes, and enabling the coupling strength between the nodes to change along with the time; generating a synchronous error dynamic model according to a synchronous state equation and the complex dynamic network model; according to the rule that the coupling strength changes along with time, a periodic intermittent controller with fixed time is arranged; the periodic intermittent controller acts on the complex dynamic network model, so that the error between the complex dynamic network model and the synchronous state equation within a fixed time is close to zero. According to the invention, coupling cost can be reduced, energy consumption can be reduced, and network synchronization efficiency can be improved.

The invention relates to the technical field of transformer detection, in particular to an intelligent detection method and system for a transformer, and the system comprises a detection state dynamic management module which carries out the dynamic detection of a detection state according to an association detection chain between detection units in an abnormal state of the transformer. And dynamically adjusting the operation state of each detection unit in the detection period. When the operation state of the transformer is detected in real time through various sensors, the energy consumption of the sensors in the detection process is reduced by adopting an intermittent detection mode; by combining the historical detection data of the transformer to obtain an associated detection chain between the detection units in the abnormal state of the transformer and the detection data of the corresponding detection units, the dynamic adjustment of the operation state of the detection units is realized, and the influence of the intermittent control mode of the detection units on the detection precision of the abnormal operation state of the transformer is reduced; effective management and control of transformer detection are realized, and high practical value and economic benefit are achieved.

The invention discloses a multifunctional small table plate for rail transit, which relates to the technical field of high-speed rail equipment and comprises a support plate, a driving motor, a threaded rod, a threaded sleeve, a main table plate, an auxiliary table plate and an intermittent control assembly. The driving motor drives the threaded sleeve to move, and the first connecting rod drives the main table plate to rotate and unfold around the connecting support. The auxiliary table board can be stored in the main table board in a sliding mode and pulled outwards when the auxiliary table board needs to be prolonged. In the drawing process of the auxiliary table plate, a linkage mechanism drives a control rod to move downwards, a triangular clamping head crosses and hooks a control pushing head to achieve automatic segmented locking, retraction caused by external force or bumping is effectively prevented, and use stability is guaranteed. And during withdrawing, the unlocking mechanism needs to be slightly pulled and triggered to enable the L-shaped connecting rod to be separated from the control groove, and then the L-shaped connecting rod can be smoothly pushed back. One-key unfolding of the main table board and flexible length adjustment and reliable self-locking of the auxiliary table board are achieved, the structure is compact, operation is safe and convenient, and the table is particularly suitable for the rail transit environment.

The utility model discloses an anastomat EMC (Electro Magnetic Compatibility) tool which comprises a clamping space for clamping an anastomat, a turntable wheel arranged on a base, a movable device arranged at the top end of the base, a power supply device arranged on the base and a motor arranged on the base, electromagnetic radiation isolation covers are mounted on the power supply device and the motor; the moving device opens or closes the anastomat, the rotating disc wheel intermittently controls the moving device, so that the anastomat is intermittently controlled to be opened and closed, and the electromagnetic radiation isolation cover can reduce emission of electromagnetic radiation; compared with the prior art, the anastomat is intermittently opened and closed, the detection process of the anastomat is completely achieved, the influence of the motor and the power supply device on overall detection is effectively reduced, and the detection precision is improved.

The present invention belongs to the technical field of mixing equipment, and discloses an automatic anti-overflow device and a control method, wherein the automatic anti-overflow device comprises a mixing tank, a vacuum pump, a solenoid valve and a stirring paddle, wherein the vacuum pump is connected to the mixing tank, the solenoid valve is arranged between the mixing tank and the vacuum pump, the air inlet pipe of the solenoid valve is connected to the mixing tank, the air outlet pipe of the solenoid valve is connected to the vacuum pump, the stirring paddle comprises a rotating shaft arranged in the mixing tank and a paddle arranged on the rotating shaft, the rotating shaft is rotatably connected to the mixing tank, the driving motor is transmission-connected to the rotating shaft, the driving motor can drive the rotating shaft to rotate, the controller is electrically connected to the solenoid valve, and the controller can control the opening and closing of the solenoid valve. In the automatic anti-overflow device provided by the present invention, the controller intermittently controls the opening and closing of the solenoid valve in a timed and quantitative manner, ensures that the vacuum degree in the mixing tank is gradually increased, and effectively prevents the occurrence of overflow.

A fuel supply system for an aircraft according to the present invention comprises: an intermediate tank which is fluidly connected to a fuel pump and an engine via a fuel supply path; a pressure sensor which detects the internal pressure of the intermediate tank or a tank pressure that is correlated with the internal pressure of the intermediate tank; and a processing circuit which executes intermittent control for controlling a pump actuator in accordance with the tank pressure. The intermittent control includes: when the tank pressure increases and reaches a first threshold value, controlling the pump actuator to stop the fuel pump in a state where supply of a fuel to the engine from the intermediate tank is allowed; and when the tank pressure decreases and reaches a second threshold value which is lower than the first threshold value, controlling the pump actuator to drive the fuel pump.

This invention discloses a simple intermittent quantization control method for Chua's circuit systems. This method first designs an indirect signal-based estimation algorithm to estimate unknown states and disturbances in the network system. Then, two threshold functions are designed to construct an aperiodic intermittent control strategy. A uniform quantization controller quantizes the system's control inputs to reduce the transmission of redundant control signals. When applied to Chua's circuit systems, this method achieves excellent unknown state and disturbance estimation results and effectively conserves system control resources.

The control circuit has a first intermittent control mode in which the pulses of the drive signal are shortened according to the input current; a hybrid control mode in which a pulse width control mode for controlling the width of the pulses of the drive signal and an intermittent control mode for shortening the pulses of the drive signal are combined; and a second intermittent control mode in which the pulses of the drive signal are shortened according to the output voltage. When the duty cycle of the drive signal is below a predetermined threshold, the control circuit selects the second intermittent control mode. When the duty cycle of the drive signal exceeds the predetermined threshold and the input voltage is above a predetermined value, the control circuit selects the hybrid control mode. When the duty cycle of the drive signal exceeds the predetermined threshold and the input voltage is below a predetermined value, the control circuit selects the first intermittent control mode.

The present invention discloses an inner barb demoulding mechanism and method for an automobile lamp injection mold, and specifically relates to the field of injection molding technology. The inner barb demoulding mechanism for an automobile lamp injection mold comprises a lower mold and an upper mold, and a molding insert is arranged on the lower mold. The present invention can complete intermittent control for multiple inner barbs and molded products through a demoulding mechanism, and can complete early demoulding control for the inner barbs of the molded product by adopting a gap advancement design, thereby avoiding the problem of damage to the molded product, and adopting multiple modes of demoulding operation at the same time, thereby avoiding damage to the molded product. Through the design of a knocking mechanism, a stable knocking force can be provided in the early stage of demoulding, accelerating the peeling of the molded product, and facilitating shortening the demoulding process, and can continuously deliver cooling liquid into multiple inner barbs to complete cooling molding, thereby avoiding the problem of incomplete cooling of the inner barb area affecting the demoulding effect, thereby improving the yield rate and reducing the scrap amount.

The rotary valve body stepping operation device comprises an outer cavity, an air outlet box is connected to the center of the lower end of the outer cavity, a rotary valve body is rotationally arranged in the center of the interior of the outer cavity, an intermittent control assembly is arranged on the air outlet box, and the rotary valve body is controlled to rotate through the intermittent control assembly; the outer cavity is further provided with a time delay relay, and the time delay relay is electrically connected with the intermittent control assembly. The invention further discloses an operation method of the rotary valve body. According to the rotary valve body stepping operation device, the problem that in the operation process of an existing rotary valve body, the overall efficiency is reduced due to the fact that a low-efficiency area exists for a long time is solved.