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249 results about "Performance comparison" patented technology

Universal testing system and method of line selection apparatus of low-current grounding system

ActiveCN105403810AEasy to compareTo achieve the purpose of mutual verificationFault location by conductor typesSimulationPower grid
The invention discloses a universal testing system and method of a line selection apparatus of a low-current grounding system. A function circuit simulation model is established, a plurality of distribution network outlet ground capacitors are simulated by using a plurality of capacitors with different impedance values, a single-phase voltage source simulates a secondary zero-sequence voltage source at a single-phase ground fault time of a distribution network, and a ground arc suppression coil and a parallel medium resistor are connected; primary line selection function comparison testing on a tested device is carried out by using the function circuit simulation model; a distribution network simulation model is established based on actual parameters, different types of feeder circuit ground faults are simulated, and comprehensive line selection performance comparison testing is carried out on the tested device in detail according to the distribution network simulation model; recording data of the field ground fault of the distribution network are collected, a fault working condition is reproduced, and a fault recording playback simulation model is constructed. According to the invention, the actual working condition of the field ground fault of the distribution network is restored to the greatest extent; and the influence on grid safety by testing projects like artifical grounding and the like can be eliminated.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2

Starting delaying method for streaming media live broadcasting system

The invention provides a starting delaying algorithm for a streaming media live broadcasting system, relates to the field of the streaming media live broadcasting on internet, and aims to solve the starting delaying problem of a client of an internet streaming media live broadcasting system. Following the development of an internet multimedia technique, an internet streaming media technique is more and more widely applied, but the advantages of the streaming media technique cannot be completely utilized because of the limitation on present network bandwidth and speed. The invention provides three dynamic starting delaying strategies, namely, a dynamic starting delaying strategy for gapping a density according to the broadcasting, a dynamic starting delaying strategy according to a network condition and a mixed type dynamic starting delaying strategy. According to a test result, the working effects and performance comparison of the three starting delaying strategies applied to the streaming media live broadcasting system are observed. According to the invention, the dynamic starting delaying strategies are combined with the streaming media technique, thereby achieving the purposes of reducing the frequency of interrupting the broadcasting at a terminal, ensuring the smooth broadcasting and protecting the sensory experience of a user.
Owner:COMMUNICATION UNIVERSITY OF CHINA

A method for evaluate that comprehensive performance of a supercritical carbon dioxide cycle power generation system of a small lead-based reactor

A method for evaluate that comprehensive performance of a supercritical carbon dioxide cycle power generation system of a small lead-based reactor. Firstly, the basic operating parameters of the supercritical carbon dioxide (S-CO 2) cycle power generation system for lead-based reactor are determined. Subsequently, the modular design method is used to establish the sub-modules of turbomachinery work, heat transfer, heat exchanger pressure drop calculation, heat exchanger efficiency calculation, thermal analysis and economic analysis of power generation system. Then, the iterative calculation method is used to solve the heat exchanger pressure drop calculation and the thermodynamic analysis sub-module of the power generation system, and the thermal parameters of the power generation system and the unit power cost are obtained. Finally, based on multi-objective collaborative optimization, the thermal performance of power generation system is evaluated. Economy. This method can effectivelycomplete the new type of small-sized lead-based reactor S_Sco2 Design of Cycle Power Generation System, Thermodynamic, Heat Transfer and Economic Analysis Models for CO2 Cycle Power Generation Systems, Efficient System Heat Transfer-Economic performance analysis, solve the problem of automatic system design, complete the comprehensive performance comparison and guide the optimal S-CO2 Cycle PatternScreening.
Owner:XI AN JIAOTONG UNIV

Static routing and wavelength allocation method based on layered graph

The invention discloses a static routing and wavelength allocation method based on layered graphs, which relates to the technical field of optical communication. In view of the characteristics of high complexity, requirements for static RWA problem splitting and the like in the existing static RWA algorithm, the method of the invention comprises the following steps: generating a layered graph model matrix for network topology; generating a service request set matrix D for network randomly, and selecting a single service from the generated service request set matrix; and carrying out routing and wavelength allocation operation on the service selected from the service request set matrix D on the generated layered graph model, thereby determining the optical channel matrix and the wavelength value. The invention can avoid splitting the static RWA problem and effectively save network resources. The invention can also evaluate the performance of various related algorithms to obtain multiple performance parameters of the algorithms, and find out the optimal solution by performance comparison, thereby realizing the preset optimization goal of saving network resources, such as wavelength, optical fiber and the like.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Sliding bearing testing machine

The invention relates to a sliding bearing testing machine which comprises a single testing machine set, a torque sensor, a driving motor, a temperature sensor and an acceleration sensor. The single testing machine set comprises a base, a rack, a hydraulic cylinder, a force measurement sensor, a loading mechanism and a work shaft, the upper face of the base is fixedly connected with the rack, the lower face of a rack cross beam is fixedly connected with the hydraulic cylinder, the force measurement sensor is arranged at the front end of a piston rod of the hydraulic cylinder, the work shaft is connected in a testing bearing component, the upper end of the testing bearing component is connected with the loading mechanism, the temperature sensor and the acceleration sensor are arranged on the two sides of the testing bearing component respectively, and one end of the work shaft is connected with the driving motor through the torque sensor and a coupling. The sliding bearing testing machine can provide the design bearing load of a sliding bearing to assess the actual work capacity, operation stability, vibration resisting performance, long indexes and other parameters of the sliding bearing. The testing machine can carry out an independent bearing test, and can achieve the synchronous test of multiple bearings and the performance comparison test of different bearings through the multi-set connection of a system.
Owner:SHANGHAI INST OF TECH

Testing method of conventional performance index of asphalt under corrosion of melting snow salt

The invention discloses a testing method of a conventional performance index of asphalt under corrosion of melting snow salt. The testing method is realized by the following technical scheme of: carrying out sample preparation on the asphalt of a freezing and thawing test; carrying out a salt freezing circulating test on the asphalt; carrying out the sample preparation on the asphalt subjected to salt freezing circulation before a conventional performance test is carried out; carrying out needle penetration, softening point and ductility tests on the asphalt; testing the adhesiveness of the asphalt and aggregate; carrying out performance comparison on an experimental result and a standard index; selecting the highway building material asphalt which is applicable to being used in a high and cold region, wherein the asphalt with the adhesiveness grade which is lower than grade 4 needs to be seriously adopted. The testing method disclosed by the invention can effectively test the change condition of a basic performance index of the asphalt after the salt freezing circulation, and the freezing and thawing test is set according to the temperature difference of the region, as well as the type and a conventional dosage of the melting snow salt. According to the method disclosed by the invention, the highway building material asphalt which is applicable to being used in the high and cold region can be effectively selected and scientific evidences for quality detection and asphalt performance assessment of an asphalt road surface material product of the high and cold region are provided.
Owner:INNER MONGOLIA UNIV OF TECH

Chinese multi-class word identification method based on conditional random field

The invention discloses a Chinese multi-class word identification method based on a conditional random field. The method includes the steps that entries related to multi-class words are acquired, and linguistic data are obtained from the entries; the linguistic data are segmented to generate chunks, and meanwhile the chunk characteristics of characters are generated in the chunks; part-of-speech tagging is performed on the characters to obtain the part-of-speech characteristics of the characters, and the characters are tagged through the chunk characteristics and the part-of-speech characteristics; part of the linguistic data are randomly selected to be trained, the rest of the linguistic data are tested, and then a first test result is obtained; a characteristic template is modified according to the characteristics of the linguistic data, the linguistic data continue being trained and tested after modification, and then a second test result is obtained; metric performance comparison is performed on the first test result and the second test result to improve identification of the multi-class words. According to the method, the Chinese multi-class words of the E-commerce field are identified through the conditional random field, and after the characteristics of the original characteristic template of the conditional random field are modified, the accuracy rate, recall rate and f value of multi-class word identification are increased.
Owner:EAST CHINA NORMAL UNIV

Combined-type multifunctional combustion device

ActiveCN105332822ARealize multi-function measurementImplementing performance comparison studiesRocket engine plantsCombustion chamberTest article
The invention provides a combined-type multifunctional combustion device. The combined-type multifunctional combustion device comprises a plurality of combustion test articles and a propellant supply system, wherein the combustion test articles are arranged in parallel. The propellant supply system comprises an oxidizing agent storage tank which is connected with oxidizing agent inlets of the combustion test articles through pipelines. An oxidizing agent flow adjustment element is arranged on the pipeline for connecting the oxidizing agent storage tank and the oxidizing agent inlet of each combustion test article. The propellant supply system further comprises a fuel storage tank which is connected with fuel inlets of the combustion test articles through pipelines. A fuel flow adjustment element is arranged on the pipeline for connecting the fuel storage tank and the fuel inlet of each combustion test article. Parallel type tests are performed through the segmental series-connection combined-type combustion device so that multifunctional measurement of combustion efficiency and heat flow distribution can be achieved; the axial length of a combustion chamber can be adjusted, and performance comparison research on different injector schemes under the same working condition can be achieved to the maximum extent.
Owner:BEIJING AEROSPACE PROPULSION INST
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