106results about How to "High engineering value" patented technology

The invention discloses a method for implementing roaming restriction to a VoWiFi (Vocie Over WiFi) voice service. According to the method, when a user registers to an IMS (IP Multimedia System) network by a WLAN (Wireless Local Area Network) access network, the user can be independently and flexibly controlled whether to use the VoWiFi service according to the position or type of the access network where the user is positioned, thereby implementing roaming restriction to the VoWiFi (Vocie Over WiFi) service of the user. Furthermore, a control opportunity of the method occurs in a stage that the user initially registers to the IMS network, subsequent interaction of a great quantity of invalid signals is avoided, a network signaling load can be effectively reduced, and the method has a high construction value.

Disclosed is an accurate tester of a superconductive-bulk magnetic-repulsion under a micro gap and a test method thereof. The tester mainly includes a double-driving mechanism, a permanent-magnetic chuck, a superconductor chuck, a liquid nitrogen cup, an optical grating displacement sensor and an S-shaped tension and pressure sensor. The tester adopts a double-driving method, a closed-loop control system and high-precision sensors to realize accurate positioning of a superconductive bulk and accurate measurement of a magnetic repulsion. The chuck structure realizes adaptive adjustment of a parallel degree of the permanent magnet-superconductor pair. The tester realizes 1mum measurement and positioning precision and 0.1 mum testing resolution so that blanks in measurement instruments of the magnetic repulsion of a superconductor bulk in the range of a micrometer gap are filled and thus testing demands for a kinematic pair/friction pair design in a micro gap in a maglev bearing can be met, and the tester has the advantages of being high in measurement precision, high in resolution and moderate in cost and the like and is worth adopting and popularizing; and the tester can also be used as a serialization product and used for teaching and scientific research of graduate students. The testing method has the advantages of being high in measurement precision, simple, convenient and practical and wide in applicable range and the like.

The invention belongs to the technical field of relay protection of a power system and particularly relates to a single-phase grounding distance protection system and method on the basis of voltage phase comparison. The system comprises a data reading module, a protection calculating module and a protection action module which are sequentially connected. The method comprises the following steps: firstly, calculating and measuring an included angle between a current and a fault voltage by using a relationship of a negative-sequence current phase at the protection mounting position and a negative-sequence current phase at a fault point; respectively calculating phase angles of a fault point voltage and a compensating voltage by using the measured voltage as a reference value; finally, according to the phase difference of the fault point voltage and the compensating voltage when an in-area or out-area fault occurs so as to construct a distance protection criterion. The single-phase grounding distance protection system has excellent resistance to transition resistance; the in-area and out-area faults can be correctly judged regardless of the transition resistance; meanwhile, protection action time and a fixed-value error meet the technical requirements of the grounding distance protection, the calculated amount is small and the single-phase grounding distance protection system has a higher practical engineering value.

The invention provides a method for testing partial discharge of suspended particles in flowing transformer oil. The method comprises the following steps that 1) a transformer oil pretreatment and vacuum injection process is performed; step 2) a transformer oil circulation heating and hydraulic stabilizing process is performed; step 3) a partial discharge withstand voltage process of the flowing transformer oil is carried out; step 4) the initial voltage of partial discharge of the flowing transformer oil containing the suspension particles is determined; step 5) the test conditions are changed and the partial discharge signal data is acquired; and step 6) the discharged transformer oil is abandoned and the circulating oil path is cleaned. According to the method, various test conditions are considered, the test conditions are strictly controlled, and the actual environment conditions in the transformer are really simulated; and by adopting the test method, the test process can be accelerated, the time cost can be lowered, the partial discharge of the suspension particles can be really and reliably measured, and the method has relatively high practical engineering value.

The invention belongs to the field of four-rotor unmanned aerial vehicle navigation and control, and aims to solve the problem of positioning and navigation of a four-rotor unmanned aerial vehicle in a GNSS denial environment. The position of the anchor point in a world coordinate system can be accurately obtained on line. The invention discloses a visual inertia tight coupling odometer based on UWB online anchor points and a metering method. A radio wave distance measuring module UWB made of an ultra-wideband technology obtains the distance between two modules according to a TW-ToF measuring principle, and after part of noise is filtered out through an outlier detection unit, the distance is used as input to be sent into a tight coupling optimization unit; an IMU inertial measurement result is also used as an input to be sent into the tight coupling optimization unit; and an embedded airborne processor utilizes the tight coupling optimization unit to process the distance measuring value between the UWB modules, the IMU measuring value and the binocular camera measuring value, and the position and attitude information of the unmanned aerial vehicle is analyzed in a tight coupling optimization mode. The method is mainly applied to four-rotor unmanned aerial vehicle navigation and control occasions.

A plastic rubber precision shaping multiprocessor control system, which comprises a host computer at the center of the multiprocessor system, an annular industrial Ethernet chain circuit with industrial abundant character, and a plastic rubber shaping device provided with an independent PLC controller, mounted on the node of annular industrial Ethernet and connected with the Ethernet chain circuit, to form a multiprocessor control system with the central control host computer. The invention is characterized in that each plastic rubber shaping device is connected with the annular industrial Ethernet via an intelligent Ethernet exchange module, the data and control signal exchange of the whole annular industrial Ethernet is realized by an Ethernet exchanger at the center of the annular industrial Ethernet, and the whole shaping process is detected by the configuration detection software of the central host computer.

The invention discloses a core electric heating system design method of a natural circulation and forced circulation loop system. The method includes design of a single electric heating element in a core analog, simulation of a box of fuel assembly and structure and assembly of the fuel assembly analog. The method accurately simulates the hydraulic nuclear heat release of the prototype according to the design parameters and functional requirements of the natural circulation and forced circulation experimental loop; the experimental data can reflect the relative characteristics of the prototype reactor, in order to achieve the purpose of research of the prototype hydraulic characteristics. The method employs lowering height simulation to easily implement the experimental device; the physical dimension of the channel is consistent to that of the prototype, so as to reduce the flow distortion; a box of fuel component analog is divided into four zones, which are connected end to end to form a series circuit, so as to increase the resistance, realize current and voltage matching in DC electric heating. The method can improve the safety and reliability of the design of a passive residual heat removal system, and has high value in engineering application.

The invention discloses a satellite weak signal capturing method and a satellite weak signal capturing system in a high-dynamic low-signal-to-noise-ratio environment. The satellite weak signal capturing device comprises a primary capturing module and a secondary capturing module, which adopt an interpolation frequency calculation method for calculating signals; after successfully capturing the signal, the primary capturing module stops working and sends estimated coarse frequency offset and coarse timing information to the secondary capturing module; and if the primary capturing module successfully captures the signal, a starting signal for starting the secondary capturing module is given, and the secondary capturing module performs secondary frequency estimation and signal arrival verification according to the coarse timing position information given by the primary capturing module and the signal after coarse frequency offset compensation. According to the satellite weak signal capturing method and the satellite weak signal capturing system, the primary capturing module is used for rapidly capturing the frequency spectrum and the position of the signal, calculating the coarse frequency spectrum and the coarse position of the signal, and carrying out capture verification and frequency fine estimation on the signal according to the secondary capturing module; and the satellite weak signal capturing method and the satellite weak signal capturing system improve the estimation precision, can be applied to various receivers, and have high engineering value.

A robust control method for angular speed stability of an under-actuated spacecraft aims at the under-actuated spacecraft with two thrusters, and the angular speed stability control law having robustness for generalized model errors of a system is designed. First a system model comprising the generalized model errors is established, and a system dynamics equation comprising the generalized model errors such as system inertia uncertainty, executing mechanism installing errors and angular speed measuring errors is obtained. Then the robust control method aiming at the derived system is designed, and global asymptotic stability is proved. Finally, a conception of a homogeneous system is introduced, and the fact that the control law enables the global asymptotic stability of an original system is analyzed and proved. The method provides a theory basis for the under-actuated spacecraft for practical engineering application, and the control law is simple in form. The robust control method can be used for robust control for angular speed stability of various under-actuated spacecrafts for which the thrusters are adopted.

A special tool for overhead line hanging object laser cutting comprises a trolley; a rotary disc is arranged on the trolley; a laser is arranged on the upper surface of the rotary disc; the external side of a laser lens of the laser is connected with a casing; a position of the casing, which is arranged at a laser lens position, is provided with a through hole; a position inside the casing, which is arranged on one side of the through hole, is provided with a guiding column; a focusing lens is arranged inside the casing; one side of the focusing lens is provided with a first motor; a transmission shaft of the first motor is connected with a first screw; the other side of the focusing lens is provided with a first nut. When the special tool for overhead line hanging object laser cutting is applied to de-icing operation, the first motor drives the first screw to rotate to enable the size of laser spots of the laser to get larger to enable ice blocks to be melted uniformly and an electric wire is avoided from burning out caused by excessively small laser spots of the laser. When the special tool for overhead line hanging object laser cutting is applied to sundry removing, the first motor drives the first screw to rotate to enable the size the laser spots of the laser to get smaller and sundries are cut through the laser spots.

The invention discloses a dual-time-scale control method of an energy storage system in a wind-storage combined power generation, which constructs a two-layer control frame, and in the outer layer control, a reference output of each period of the energy storage system on a large time scale is dispatched based on an optimization theory. In the inner layer control, the outer layer optimization result is the control constraint, which suppresses the high frequency fluctuation of the wind power output on the small time scale. Through the coordination between the internal and external control, the energy storage system can be used to stabilize the fluctuation of wind power output, and improve the grid operation economy and wind power absorbing capacity.

The invention discloses a method and a system for realizing Quality of Service (QoS) parameter control based on an HSS, and a device. The method comprises the steps that: the HSS generates extended user subscription data for a subscriber, so that the user subscription data contains QoS parameters corresponding to different user characteristics; and the HSS transmits the extended user subscription data to a packet data gateway (PGW), so that the PGW adopts the QoS parameters corresponding to the user characteristics for offering QoS service to users. According to the method, the system and the PGW, the user can distinguish different user characteristics under a same APN without adding a PCRF network element, the QoS parameters corresponding to the user characteristics are adopted for offering QoS service, and the complexity and difficulty of operation and maintenance are reduced.

The invention discloses a load recovery optimization method considering a unit state in a system recovery process. Load optimization considering the unit state is established by utilizing a logic preference description language, a nonlinear model of load recovery is established, the model is solved by adopting an artificial bee colony algorithm, and a load recovery line and time considering the unit state are obtained. The method comprises the following steps of: 1, constructing a load optimization grading knowledge base considering a unit state in a system recovery process, 2, establishing aload optimization preference strategy set considering the unit state in the system recovery process, 3, establishing a load recovery optimization model considering the unit state in the system recovery process, and 4, solving the load recovery optimization model by adopting an artificial bee colony algorithm to obtain a recovery line and time of the load considering the unit state in the system recovery process. According to the method, load recovery in the system recovery process can be optimized, important loads are ensured to be rapidly recovered, and a reasonable load recovery scheme is provided.

The invention discloses a speed tracking control method for achieving a stable flight of an airship according to a given speed. The method comprises the steps of generating a forward flight velocity measurement and speed error signal; forming an error-based nonlinear gain entry; measuring a vertical velocity, a pitch angle and a pitch angle rate and building an adaptive term; designing an airship speed tracking control law; approximately simulating the characteristics of an airship pitching channel according to a mathematic model built by the differential equation of the airship pitching channel; and observing data of various states of the airship and drawing a picture by continuously adjusting control parameters, observing a data curve of a transverse flight speed of the airship and analyzing a response effect of constant-speed tracking control, thereby finally determining a group of airship control parameters, and enabling the speed tracking control of the airship to have satisfied dynamic response performance and steady-state response performance.

The invention provides a transformer winding structure inductance calculation method. The method is characterized by comprising the steps: based on winding inductance calculation of an energy perturbation finite element method and based on winding inductance analytical calculation of a transformer nameplate parameter, by modeling and solving an electrical transformer three-dimensional finite element magnetic field, simulating magnetic field distribution in a transformer, and fully considering the influence of a change of the magnetic field on an internal structure parameter of the transformer, especially a magnetic field change caused by an energy change in a winding structure, thereby calculating winding inductance. The method has broad adaptability to materials, boundaries and excitation, is convenient for treating a complex closed field magnetic field in which a plurality of mediums coexists, is helpful for transformer winding parameter identification and fault diagnosis, is quick and accurate in calculation and high in adaptability, and has relatively high engineering value.

The invention discloses an air-based rail detection method based on an attention enhancement mechanism, belonging to the field of aviation surveillance. The method comprises the steps that firstly, the high-definition array camera is mounted on the aerial vehicle, and the original image of the railway track is acquired and pre-processed to obtain training samples; the images of the training samples are inputted into the convolutional neural network for feature extraction, and the 16*16 encoded images are obtained, and the attention enhancement is carried out to increase the ability of featureexpression; then the up sampling is carried out on the image after the attention enhancement by convolution neural network to get the same size decision map as the original image, and the decision mapis classified and judged, and a point in the decision map is a point on the rail; and finally, according to the decision result, the network parameters are updated by back propagation using gradientdescent algorithm. On the basis of precise detection, the method of the invention can monitor the surrounding environment of the rail and the safety condition of the rail, has accurate positioning andremarkable effect, and has strong engineering value and practical significance.

The invention provides a radome electromagnetic performance analysis method under a force load. The method mainly comprises the following steps: S1, establishing a radome mechanical calculation finiteelement model, and electromagnetically calculating an undeformed finite element model; s2, adding material attributes to the mechanical finite element model established in the step S1, applying aerodynamic load and boundary conditions, and completing solving of a static problem; and S3, carrying out post-processing on the calculation result of S2, and extracting node displacement. S4, reconstructing the finite element model in S3 based on Python language to obtain a deformed finite element model under aerodynamic load; s5, reconstructing the finite element model deformed in the step S4 basedon HyperMesh software to obtain an electromagnetic calculation finite element model, and completing the analysis of the wave transmission performance of the radome under the aerodynamic load; s6, electromagnetic medium parameter setting and antenna modeling of the electromagnetic calculation finite element model established in the step S1.2 are completed, original-state radome wave-transparent performance analysis is completed, and the original-state radome wave-transparent performance analysis is compared with the calculation result in the step S5.