36results about How to "Improve speed and reliability" patented technology

A routing mechanism, service or system operable in a distributed networking environment. One preferred environment is a content delivery network (CDN) wherein the present invention provides improved connectivity back to an origin server, especially for HTTP traffic. In a CDN, edge servers are typically organized into regions, with each region comprising a set of content servers that preferably operate in a peer-to-peer manner and share data across a common backbone such as a local area network (LAN). The inventive routing technique enables an edge server operating within a given CDN region to retrieve content (cacheable, non-cacheable and the like) from an origin server more efficiently by selectively routing through the CDN's own nodes, thereby avoiding network congestion and hot spots. The invention enables an edge server to fetch content from an origin server through an intermediate CDN server or, more generally, enables an edge server within a given first region to fetch content from the origin server through an intermediate CDN region.

The invention relates to the field of flow measurement, in particular to a coriolis mass flowmeter plus-minus phase-step alternative excitation vibration-starting method and a system thereof. The system comprises a magnetoelectric velocity transducer, a voltage follower, a low-pass filtering amplifier, a biasing circuit, a limiter circuit, an audio-frequency CODEC (coder decoder), a DSP (display signal processor), a DDS (direct digital synthesizer), an amplifier, a MDAC (multiplication digital-to-analog converter), a power amplifier and a vibration exciter. The vibration amplitude of a flow tube can be enlarged continuously, reliably and rapidly by tracking phases of self-excitation output signals of detecting sensors and carrying out plus-minus phase-step alternative excitation, and the vibration-starting time of the flow tube can be shortened greatly with the combination of non-linear amplitude control algorithm and frequency estimation algorithm.

For supporting a change of a reference station, first data that is valid for a first reference station is provided for transmission to a device, then data that is valid for the first reference station and data that is valid for a second reference station is provided for transmission to the device in parallel for a limited time, and finally data that is valid for the second reference station is provided for transmission to the device. The data for the first reference station and the data for the second reference station include measurements on satellite signals. At a receiving end, the respectively received data can be provided for a positioning of a device comprising a satellite signal receiver.

This invention relates to a relay protection control system combining the DSP technology and the quick Fourier algorithm advantaged: 1, utilizing the ability of high speed data computation and accurate data process ability of DSP to carry out double signal control to the action executing device of the relay protection to increase its reliability and quickness of the action, 2, the entire control system has fine adjusting performance to increase the stability of the net and reduce the probability of stopping production brought with error or refusing action of the relay protection, 3, applying the improved Fourier algorithm to simplify the computation of harmonic analysis, 4, simple hardware circuit and accurate real time control.

The invention discloses a method for tracing the maximum power point of a switch reluctance motor wind power generation system. According to the method, sudden change of wind speed can be judged without a wind speed detection device, a complex control algorithm is not involved, and spot operation is convenient. Based on a perturbation and observation method, the method traces and controls the maximum power point of the system by a proper perturbation step length when the wind speed changes suddenly, the problem that lock-rotor of an electric generator happens due to the fact that exciting current is out of tone when the wind speed suddenly drops is solved, and operation stability of the switch reluctance motor wind power generation system is guaranteed. The wind power generation system mainly is composed of a wind turbine, a gearbox, a power converter, a bus capacitor, a DC power supply, a DC load, a controller, a switch reluctance motor, a signal filter device and a signal detection device. The output signal filter device is added to the DC bus side of the switch reluctance motor wind power generation system, so that the oscillation amplitude of output power is reduced, and rapidity of tracing of the maximum power point is improved.

The invention relates to an internal combustion engine exhaust on-line measurement and diagnosis method and equipment. The internal combustion engine exhaust on-line measurement and diagnosis equipment comprises a measuring device, a processing controller and a display device, wherein the measuring device comprises an air fuel ratio sensor and an oxynitride sensor, the air fuel ratio sensor measures the air fuel ratio of a combustible gas mixture of an internal combustion engine, and the oxynitride sensor measures the concentration of the oxynitride in the exhaust of the internal combustion engine; the processing controller is in signal connection with the measuring device and can be used for storing an internal combustion engine discharge table or an internal combustion engine discharge mathematical model, and the processing controller receives the data of air fuel ratio of combustible gas mixture and concentration of the oxynitride in the internal combustion engine exhaust and judges the discharge state of the internal combustion engine according to the stored internal combustion engine discharge table or internal combustion engine discharge mathematical model; and the display device is in signal connection with the processing controller and displays the discharge state of the internal combustion engine. The method comprises a measurement step, a processing control step and a display step. The method and equipment provided by the invention can be used for rapidly measuring the concentration of a specific component in the internal combustion engine exhaust and judging whether the internal combustion engine exhaust meets the standards or not.

The invention discloses a method, a device and a system for realizing information transmission based on visible light. The method for realizing information transmission based on visible light comprise the following steps: encoding a file to generate bit information when sending file information; grouping the bit information to get bit groups, wherein only the bit information in the same bit group is displayed on a screen at the same time; displaying the bit information in the bit groups screen by screen, wherein the bit information is modulated into pixels of corresponding colors for display, so that a receiving device can acquire images displayed on the screen, and the file is sent to the receiving device. By transmitting data in real time using a screen or an image acquisition unit such as a camera, the transmission process is simplified, the speed and reliability of directional data transmission are improved, and the problem that the existing system is susceptible to interference and is low in transmission rate is solved. A new technological path is provided for visible light communication.

The invention discloses a control circuit of a relay protection device and a method for operation, wherein the control circuit comprises a center data processor module, an analog quantity data collection module, an opening-inserting opening-excluding interface module, a communication module, a power module and a keyboard display module. The operation method comprises the following steps: 1) signal gathering stage, 2) signal deforming and changing stage, 3) timely sampling time counter setting stage, 4) electric net instantaneous parameter calculating stage, 5) current condition detecting stage, 6) the center data process module judges and controls a relay protection device breaking stage. The beneficial effect of the invention is characterized by utilizing digital signal process chip to realize relay protection movement control, improving relay protection reliability and rapidness, overcoming control lag and movement and non-timely defect induced by programmable logic control technique and common single-set chip process speed limit, having good adjustability and reliability and reducing the probability of production halt due to relay protection false operation or rejection.

The invention relates to an improved master-slave control method for a DC distribution network. The invention is technically characterized in that the method comprises the following steps: Step 1, designing an adaptive droop controller with a dead zone; and 2, setting one MMC converter station as the main station with the working mode being a constant voltage control mode, and setting the other MMC converter stations as slave stations with the working mode being the control mode of the adaptive droop controller with the dead zone in the Step 1. According to the invention, seamless switching ofoperation modes can be realized and the stability of DC voltage can be ensured when communication failure occurs.

The invention discloses a reliability control method and system based on unidirectional data transmission, and the system is characterized in that an acquisition unit, a transmitting unit, a receivingunit and an analysis unit are in unidirectional communication connection in sequence, and the analysis unit is in communication connection with the transmitting unit. The acquisition unit is used foracquiring actual service scene data and network flow; the transmitting unit is used for packaging and sending the data acquired by the acquisition unit; the receiving unit is used for receiving the data packet sent by the sending unit, collecting system state data according to millisecond precision and sending the collected system state data to the analysis unit, and the analysis unit is used foranalyzing the received system state data and generating a time sequence database according to the system state data. By combining the system state of the data packet loss rate acquired and analyzed in the actual data transmission process and the mode of intelligently and dynamically adjusting the sending speed, it is ensured that data can be accurately received, and meanwhile existing hardware can be better utilized to achieve one-way transmission of balance performance and reliability.

The invention discloses a rivet contour point cloud extraction method, which comprises the following steps of collecting a three-dimensional scanning point cloud on the surface of an aircraft skin toobtain three-dimensional point cloud neighborhood information; according to the three-dimensional point cloud neighborhood information, calculating and obtaining the initial local density of each point cloud; performing calculating according to the initial local density to obtain adaptively enhanced point cloud density, and defining a significance measurement method of the circle model according to the adaptively enhanced point cloud density; and automatically extracting the rivet contour point cloud through an RANSAC algorithm according to a saliency measurement method of the circle model. According to the method, the three-dimensional information of the rivet can be rapidly and accurately obtained, the rivet alignment degree and the riveting quality can be accurately detected based on the extracted rivet contour point cloud three-dimensional information, and the rivet detection speed and reliability are greatly improved.

The invention relates to a target identification method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring target video frame image data; performing target detection and identification processing on the target video frame image data to obtain attribute information of a plurality of to-be-detected targets; wherein the attribute information comprises coordinate information and category information; performing exception judgment processing on the attribute information to screen out an exceptional target in the plurality of to-be-detected targets; performing preset structuralization processing on the target attribute information of the abnormal target to obtain target structuralized attribute information; and sending the target structured attribute information to a preset display platform. By adopting the method, the flexibility and intelligence of the computer equipment can be improved.

The invention discloses a time-based one-time password method suitable for a PLC, to-be-verified equipment, verification equipment and an identity verification system. The method comprises the following steps of enabling an attestation party to execute the steps of: A1, acquiring a verification key; A2, establishing a password chain containing a plurality of nodes, storing the password value of the head node, and sending the password value of the tail node to a verification party; a3, generating a first one-time password by using the verification key, the end time of the password chain and thecurrent time, and sending the first one-time password to the verification party; enabling a verification party to execute the following steps: B1, setting a dynamic verification point and recording the latest identity verification time; b2, receiving the first one-time password, recording the receiving time, if time verification is passed and the value of the second one-time password is equal tothe value of the current verification point, determining that verification succeeds, and updating the verification point and the latest identity verification time. According to the method, high-efficiency and high-security verification of the PLC identity is realized, PLC firmware does not need to be changed, and memory occupation is reduced.

The invention relates to the technical field of information interaction, in particular to an information interaction system supporting heterogeneous resources and a heterogeneous information interaction method. The information interaction system supporting heterogeneous resources comprises at least one top domain composed of a plurality of distributed nodes, wherein the top domain is mainly formedby a main chain with information recording and reading functions; and a sub-domain formed by a sub-chain or a database with information recording and reading functions, wherein the sub-domain comprises at least one node, the information or representation of the information is interacted in the domains and between the domains, and the external node performs information interaction with the systemfor the first time after becoming a sub-domain of one domain of the ontology system. The invention further provides a heterogeneous information interaction method. The problem of cross-chain interaction between different blockchain networks is solved, and data interaction and asset transfer between the blockchain networks and a traditional centralized database become possible.