19results about How to "Guaranteed dynamic performance" patented technology

The invention discloses a piezoelectric pressure sensor for an explosion field, and the sensor comprises a housing, and a diaphragm, a force transmission block, two piezoelectric crystal plates, an inertia compensation mass block and an electrode plate which are disposed on the surface of the housing and in the housing. The two piezoelectric wafers generate positive charges on the upper surfaces and negative charges on the lower surfaces, and due to the fact that the two piezoelectric wafers are connected in series, the sensor outputs voltage signals in direct proportion to shock wave pressure. When the sensor is subjected to the action of acceleration, the inertia compensation mass block can generate opposite acting force on the two piezoelectric crystal plates, so that the two piezoelectric crystal plates respectively generate opposite voltage signals, and the compensation of acceleration parasitic output signals can be realized.

The invention discloses a hidden detachable heating temperature control system for a product test platform, and the system comprises a rack, a heat preservation box, a left pressing piece type clamp, a right pressing piece type clamp, an upper pressing piece type clamp, a heating box, a heating rod, an air outlet pipeline, and an air inlet pipeline. And the left and right pressing sheet type clamps are fixedly mounted at the inner bottom of the heat preservation box. According to the method, feedforward temperature control is utilized, the control delay and lag problems of a pure lag system are well solved, and the dynamic performance and the steady-state performance of the control system are greatly guaranteed by combining an active control strategy; a traditional incubator is divided into the heat preservation box and the heating box, and the heating box is designed in a hidden mode, so that the size of a single individual is reduced, the risk that an operator is scalded by high temperature is reduced, and safety is improved; the test condition of most products is normal temperature, so that the heat preservation box is designed to be detachable, and the operation convenience under the normal temperature test condition is greatly ensured.

This invention discloses a method for estimating the speed and position of a permanent magnet synchronous motor (PMSM) based on a third-order switched extended state observer. Specifically, based on the mathematical model of the PMSM, a back-EMF observer based on a sliding mode observer is constructed to obtain the estimated back-EMF. Further, the estimated back-EMF signal is processed using a low-pass filter and amplitude normalization. The processed back-EMF is then used as the input signal to a position estimation scheme based on the third-order switched extended state observer, achieving accurate estimation of the PMSM's speed and position under different operating conditions. This invention is simple in principle and easy to implement. It combines the advantages of both third-order linear and third-order nonlinear extended state observers, improving estimation accuracy and dynamic performance while reducing the adverse effects of noise on the estimation scheme. This solves the technical problems of low estimation accuracy, high noise sensitivity, and difficulty in parameter tuning in existing estimation schemes.

This invention relates to a method and system for access control of power grid control data interfaces based on graph neural networks, belonging to the field of anomaly detection technology, and solving the problem of overly simplistic and mechanical anomaly detection in existing technologies. The method includes: constructing a graph model of the power grid control data system using user nodes, data interface nodes, and data resource nodes from historical data; obtaining the edge weight access strength from the user node to be analyzed to the target resource node based on the constructed graph model; performing three-stage corrections on the attention coefficients based on causal constraints, adversarial robustness, and interpretability based on a graph attention neural network, obtaining the embedding vector representations of the user node to be analyzed and the target resource node; predicting the access control probability score of the user node to be analyzed to the target resource node based on the embedding vector representation and the edge weight access strength; and assigning corresponding operation permissions to the user node to be analyzed based on the probability score. This invention can effectively resist potential attacks and significantly improve the efficiency of power grid access control.

The invention provides a power supply master-slave-free parallel connection dynamic current sharing circuit and a parallel connection power supply, and aims to solve the problems that in an existing power supply master-slave-free parallel connection current sharing method, due to the fact that parallel connection signal interaction and parallel connection logic processing are achieved through software, the dynamic performance of a master-slave parallel connection system is poor, a current sharing ring is added in the software, and the dynamic performance of the master-slave parallel connection system is poor. And the parallel debugging difficulty of the power supply is greatly increased. According to the power supply master-slave parallel connection-free dynamic current sharing circuit provided by the invention, through reasonable arrangement of the first operational amplifier follower circuit, the second operational amplifier follower circuit, the diode D1, the diode D2, the diode D3 and the diode D4, current sharing among power supply modules in a parallel system is automatically realized through hardware, and software current sharing control does not need to be added; the series connection level of the control system is not increased, the parallel operation debugging difficulty is greatly reduced, and meanwhile the dynamic performance of the master-slave-free parallel operation system is effectively guaranteed.

The invention discloses a chemical wounded intelligent transfer cabin based on RFID and a dynamic triage classification method, and belongs to the technical field of medical rescue equipment. The transfer cabin main body integrates the RFID identification module, the vital sign monitoring module, the environment monitoring module, the data transmission module, the cabin body regulation and control module and the emergency response module, and the RFID identification module and the transfer cabin main body are in multi-unit collaborative design, so that rapid and accurate acquisition and storage of identity information of multiple wounded personnel are realized; the problems that the identity of the wounded person is disordered and information is lost on a chemical accident site are solved, the dynamic triage classification method depends on the wounded person identity information, physiological data and environmental data collected by the transfer cabin, dynamic evaluation and classification of the injury condition of the wounded person are achieved through multi-dimensional information fusion, and the dynamic triage classification method cooperates with the transfer cabin body to work. Identity recognition, state monitoring, injury condition grading and transfer scheduling of the chemical wounded personnel in the process of transferring the chemical wounded personnel from a site to a treatment point are completed, and efficient and accurate transfer and injury inspection support is provided for wounded personnel treatment.

The application discloses a steam turbine moving blade root weight-reducing structure, a steam turbine moving blade and a manufacturing method thereof. The steam turbine moving blade root weight-reducing structure comprises a fir-type blade root and a blade root intermediate body connecting a blade body and the fir-type blade root, and a weight-reducing groove is arranged on the inner arc side of the blade root intermediate body. The opening area of the weight-reducing groove accounts for 60%-40% of the area of the inner arc side without the weight-reducing groove. After the assembly of adjacent blades is completed, the contact area of the inner arc side of the blade root intermediate body accounts for 40%-60% of the contact area of the inner arc side of the blade root intermediate body without the weight-reducing groove. The application has the advantages that the average stress level of the blade root area can be effectively reduced, the manufacturing cost of the blade is reduced, the processing difficulty of the blade is not increased, the blade root weight can be reduced, the strength and rigidity of the blade root can be effectively ensured, and the like.

The invention discloses a water supply control method and device and a water quality detection and water supply control internet of things system, the internet of things system comprises a sensing control layer, a network layer, a water supply monitoring cloud platform and an application layer, the network layer is used for realizing data interaction among the sensing control layer, the water supply monitoring cloud platform and the application layer; the application layer comprises a water supply APP mobile terminal and a water supply monitoring terminal; the sensing control layer detects pump room environment parameters and water quality and water level parameters through a plurality of water supply measurement and control units, performs water level control, and uploads detection data to the water supply monitoring cloud platform; management personnel access the water supply monitoring cloud platform at the water supply monitoring end or the water supply APP mobile end, environment monitoring, water quality monitoring, water supply monitoring and environment and water quality big data storage and management are achieved, and water supply safety is guaranteed.

The invention discloses a high-performance DC power parallel control system and control method, belongs to the field of DC power supply technology, includes loop control module, signal follower module, communication module, loop control module includes voltage outer loop control circuit, current outer loop control circuit, realizes accurate control of voltage and current; signal follower module includes two identical follower circuits, realizes voltage following and power amplification, and ensures that voltage signal has high driving ability; communication module includes STM32 control circuit, differential drive circuit and RS485 communication circuit, realizes signal communication such as current control, start-stop control and alarm control between host and slave; differential circuit ensures that analog signal is transmitted without attenuation. The present invention can be applied to the parallel control of DC power supply of the same model. When multiple power supplies are paralleled, the voltage outer loop control signal is transmitted with analog circuit, and the signal is continuously transmitted without interruption and the transmission speed is fast, which ensures the dynamic performance of power supply.

The present application provides a kind of electrolyte for lithium ion secondary battery and lithium ion secondary battery using the electrolyte.The electrolyte provided by the present application contains: organic solvent, electrolyte lithium salt and additive, the additive contains compound A, the compound A is as shown in the following structural formula a.By using the additive provided by the present application, the cycle performance of lithium ion secondary battery under high energy density and charge rate can be improved.[Compound A]

The application discloses a method for optimizing residence time in a magnetorheological processing of an optical element, which introduces a particle swarm algorithm into pulse iteration to calculate the residence time. Compared with the residence time calculated by original ordinary pulse iteration, the medium frequency error of the surface profile of the optical element is smaller, the instantaneous feed speed of the polishing wheel in the polishing process is reduced, and the influence on the stability of the machine tool is reduced. The application reduces the frequent acceleration and deceleration movement of the polishing wheel in the processing process, thereby reducing the surface profile error, especially the medium frequency error, and has great application value.

The utility model relates to an insulator fitting galvanization post-processing device which comprises a zinc vibration workbench and a bearing table, the zinc vibration workbench is used for placing a galvanization rake provided with an insulator fitting, the bearing table is located below the zinc vibration workbench, and the zinc vibration workbench is driven by a driving mechanism to be in a first state and a second state; in the first state, the zinc vibrating workbench is driven by the driving mechanism to move upwards to the highest position; in the second state, the zinc vibrating workbench freely falls downwards from the highest position under the action of gravity and knocks the bearing table below; according to the post-treatment equipment for galvanization of the insulator hardware, the zinc vibration workbench is moved to the highest position and then freely falls to knock the bearing table, so that hanging zinc and zinc thorns on the insulator hardware are automatically separated from the insulator hardware under the inertia effect; the tool is simple in structure and convenient to operate, a zinc coating tightly attached to the surface of the insulator fitting cannot be affected, the insulator fitting does not need to be raked to be turned over during operation, and the zinc plating post-treatment period is shortened.

This application discloses a control method, device, terminal, medium, and product for a grid-type inverter in a power transmission network. The solution provided in this application, in this embodiment, constructs a nonlinear state-space model of the grid-type inverter and reconstructs it into a q-LPV model. Combined with polyhedral representation and distributed passive LMI constraints, it can effectively handle the strong nonlinear dynamic characteristics exhibited by the grid-type inverter under complex operating conditions in the power transmission network. This ensures the stability and dynamic performance of the system when facing large-signal disturbances such as high-power disturbances and load abrupt changes, and avoids instability problems caused by the limitations of linearized models.

The invention relates to a virtual impedance remodeling method for improving the stability of an inverter under a weak power grid, and belongs to the technical field of new energy grid connection, and the method comprises the following steps: S1, constructing a Norton equivalent circuit model, considering a phase-locked loop, of a single-phase grid-connected inverter; s2, obtaining the output impedance of the grid-connected inverter considering the phase-locked loop according to the Norton equivalent circuit model considering the phase-locked loop of the single-phase grid-connected inverter; s3, introducing series virtual impedance into the Norton equivalent circuit model of the single-phase grid-connected inverter considering the phase-locked loop, and constructing an equivalent Norton circuit of the virtual series impedance grid-connected inverter; s4, constructing an output impedance expression of the grid-connected inverter after virtual impedance remodeling; and S5, determining virtual impedance by considering a stability requirement, a harmonic suppression capability requirement and a power grid current steady-state error. According to the invention, the stability of the grid-connected inverter under the weak power grid is improved, and the tracking accuracy of the output to the given value is ensured.

The application discloses an immersive AI process three-dimensional dynamic visualization method based on a particle system, and relates to the technical field of computer graphics and three-dimensional visualization. The immersive AI process three-dimensional dynamic visualization method based on the particle system comprises AI process association operation, AI process particle processing and UI interaction control. The AI process particle processing is executed to obtain an AI particle dynamic structure, the AI process key year switching is executed to obtain camera track-particle disturbance parameter linkage, and the UI interaction control is executed to obtain AI process dynamic visualization time axis interaction, so that the accuracy of immersive AI process three-dimensional dynamic visualization data is improved, and the technical problem of low accuracy of immersive AI process three-dimensional dynamic visualization data in the prior art is solved.

The utility model relates to the technical field of hydraulic systems, in particular to a two-way stop reversing valve and a pressure relief structure thereof. The pressure relief structure comprises a first valve sleeve and a second valve sleeve, wherein a first valve port, a second valve port and a liquid drainage port are formed in the first valve sleeve; the main valve element and the pilot valve element are movably arranged in the first valve sleeve, and a first liquid channel connected with the first valve port and the second valve port is formed in the main valve element; a pressure relief channel communicated with the first liquid channel is formed in the second valve sleeve, the pilot valve element is in sliding connection with the second valve sleeve, and the pilot valve element slides along the second valve sleeve to achieve communication or cut-off of the liquid drainage opening and the pressure relief channel. The two-way cut-off reversing valve comprises the pressure relief structure and a driving part used for driving the pilot valve element to move in the second valve sleeve. The technical problems that in the prior art, a pilot valve element is closed in the moving space between a valve sleeve and a main valve element, hydraulic impact in a two-way stop reversing valve is difficult to effectively buffer or release, and switching is stuck or response is slow are solved.

This invention provides a real-time correction method for endoscopic image distortion, comprising: placing an improved rigid endoscope system at a target position and setting operating conditions; in each frame of the image of the biological tissue acquired by the endoscope, firstly performing laser gating projection correction, and calculating a homogeneous transformation matrix between the projection distortion correction line image and the correction line reference image; then, acquiring the current endoscopic distortion image acquired by the CCD camera again, processing it using the homogeneous transformation matrix to obtain the endoscopic corrected image, and displaying the corrected image on a monitor for human observation, thus eliminating the distortion. Because the period of the pulsed laser projecting the correction line reference image is extremely short, much shorter than the human eye's visual persistence period, the observer will not perceive the laser gating projection correction process, ensuring the dynamic and real-time nature of image correction; moreover, the instantaneous exposure of the weak laser will not damage biological tissue, ensuring the medical safety of image correction.