10results about How to "Guaranteed dynamic performance" patented technology

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 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 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 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.