313results about How to "Evaluation results are reliable" patented technology

The invention relates to a method for evaluating the lightning protection performance of transmission lines based on the parametric statistics of lightning. The method comprises the following basic steps: firstly, the information of the transmission lines which require the lightning protection performance evaluation is given; secondly, the ground flash density and the probability distribution statistics of the lightning current magnitude within a specified period are performed to the given transmission lines; thirdly, the lightning-stroke trip-out rate in each section of the transmission lines segmented according to a pole tower within the specified period is calculated; fourthly, a reference value is set according to a design value, a specified value or an operation experience value of the lightning-stroke trip-out rate, and the time difference and the space difference of the lightning protection performance of the transmission lines are evaluated according to the lightning-stroke trip-out rate of each section of the transmission lines and a whole line within the specified period, wherein the lightning-stroke trip-out rate is obtained through the calculation in the step three. The method has the advantages that the evaluation to the lightning protection performance of the transmission lines is performed on the basis of the parametric statistics of lightning with time and space differences; the evaluation result of the method to the lightning protection performance of the transmission lines is more reliable, and has more pertinence; and the evaluation to the lightning protection performance of the transmission lines on different times and different spaces is realized.

The invention relates to a remote sensing assessment method and system for ecosystem vulnerability. The method comprises the steps of performing ecosystem vulnerability zoning in a target area range, determining ecosystem vulnerability assessment indexes of different zones according to the zoning result, establishing a corresponding ecosystem vulnerability assessment system in each zone, determining the weights of the ecosystem vulnerability assessment indexes in the different zones by using a hierarchical analysis method, and establishing an ecosystem vulnerability remote sensing assessment model based on a comprehensive index method to assess the ecosystem vulnerability. According to the method, a reasonable ecological environment zoning scheme is formed in the target area range, and a scientific and normative ecosystem vulnerability assessment system, a weight assignment scheme and an assessment model are respectively constructed according to the ecological environment characteristics of the zones to realize intelligent remote sensing assessment of the ecosystem vulnerability, so that the assessment result is accurate and reliable and repeated operation can be implemented.

The invention discloses a method for evaluating the foundation stability of a coal mining subsidence area. The method comprises the following steps of (1) calculating the height of a caving fracture zone: according to different geological and mining conditions, measuring related parameters and selecting a calculation formula or an empirical formula for the height of the caving fracture zone; (2) calculating the load impact depth of the coal mining subsidence area: according to the geological stratum conditions of a goaf, analyzing the gravity stress and additional ground stress of a foundation and determining a calculation method for the building load impact depth of the coal mining subsidence area; and (3) evaluating the foundation stability of the coal mining subsidence area: according to a mutual relation among the mining depth H<mining> of a coal seam, the height H<fracture> of the caving fracture zone in the coal mining subsidence area and the building load impact depth H<impact>, evaluating the foundation stability of the coal mining subsidence area. The method is suitable for foundation stability evaluation of different mining methods and mining processes under different geological and mining conditions, and is wider in application range and good in evaluation effect.

The invention discloses a safety warning method of an electric vehicle power battery, which comprehensively evaluates the safety of the battery from two perspectives of battery performance degradationand possible failures, and gives a safety rating. In the evaluation of battery performance degradation, a degradation model prediction method based on particle filter is adopted, the remaining life of the current battery is predicted through estimating the model parameters, and a degradation index of the battery is given combined with the health status of the battery; and a method based on the BPneural network is used, and the history and real-time data of the battery BMS system are used as inputs, so as to extract the states associated with various critical faults and predict the possibility of various faults. After the two aspects of the safety assessment results are combined, comprehensive safety warning information is given. Compared with the current method of evaluating the safety of the battery only from the perspective of the remaining life or the health state, a more reliable evaluation result can be given.

The invention discloses a detailed terrain data-based transmission line failure-shielding and lightning-protection performance evaluation method. The method comprises the following steps of: acquiring statistical lightning data of a line corridor in a specified time period by a lightning parameter statistical method by adopting line basic information, line geographic information, line structural characteristics and line insulation characteristics; scanning a three-dimensional coordinate of a transmission line corridor by using geographic information system (GIS) software; determining the landscape along a line and a ground angle according to the three-dimensional coordinate in the direction vertical to the line corridor; determining wire-to-ground height variation caused by surface undulation according to the three-dimensional coordinate in the direction along the line, and acquiring detailed terrain data along the line by three-dimensional GIS scanning; calculating the shielding failure trip-out rate of each base tower according to the detailed terrain data extracted based on the GIS scanning; and acquiring real line failure-shielding and lightning-protection evaluation data in the specified time period by comparing a design value, a specified value or an operation experience value of the line failure shielding trip-out rate with a reference value of the line failure shielding trip-out rate. Therefore, the line failure-shielding and lightning-protection performance evaluation is realized.

The invention discloses a dynamic correction method for reliability assessment of a large-sized oil-immersed power transformer; a transformer oil-paper insulating system is used as an assessment object, and two processes are involved; in the first process, with hotspot temperature calculation as the core, an HST-based (hotspot temperature) transformer aging fault model is established in conjunction with Weibull distribution and Arrhenius reaction law, winding HST is acquired by calculating, and fault rate gamma of the transformer oil-paper insulating system is solved; in the second process, with gray target correction analysis via dissolved gas in oil as the core, a relationship between transformer health state and its predicted life is established via grey theory, equivalent HST value is obtained, dynamic correction is provided for the basic model in the first process, and it is ensured that the assessment value is capable of well tracing and reflecting actual reliability level of the transformer. By using the method, it is possible to effectively solve the problems that, for instance, a transformer reliability analysis model has low accuracy and is difficult to popularize and apply.

A credibility evaluation method of software units of a complex software system includes the following steps: A building a credibility index system; B determining a credibility evaluation comment set; C acquiring an objective weight through factor analysis by aid of SPSS (Statistic Package for Social Science), acquiring a subjective weight with an analytic hierarchy process and determining the final factor weights with a dynamic assignment method; D conducting first-level fuzzy evaluation on credibility of the software units; E correcting the evaluation result through multiple fuzzy composition operators; F iterating the above calculation process to achieve multi-level fuzzy comprehensive evaluation on the credibility of the software units. The credibility evaluation method classifies evaluation indexes, so that an evaluation result is more reliable; acquired index weight values better accord with the practical condition of the software units, so an objective and subjective weight structure can be adjusted dynamically according to different software units; the evaluation result is corrected through the multiple fuzzy composition operators so that the evaluation result is more scientific, accurate and reasonable.

The invention discloses an omni-mobile balance capacity assessing and training system of stroke patients. The omni-mobile balance capacity assessing and training system structurally comprises a fixingdevice, a safe device, a moving device, a data collecting device, a data processing and displaying device and a visual interference device; on the basis of multi-mode signal collecting and processingand by combining friendly human-computer interaction between voice prompt and the tested persons, a human body balance capacity assessing virtual task based on the Unity 3D design is completed by thestroke patients, information such as age, gender, stature, weight, pressure center path, heart rate, blood pressure, electromyographic signal and joint angle of the stroke patients are obtained accurately, and balance capacity assessing results of the stroke patients are comprehensively given; the system can further automatically formulate a corresponding training scheme according to the assessing results, and balance capacity training of the stroke patients is achieved by combining a balance capacity training game in VR glasses; and the omni-mobile balance capacity assessing and training system is simple in structure, easy and convenient to operate, capable of moving omni-directionally and high in reliability, and has good promotional value.

The invention relates to an assessment method for rainstorm disaster risks of sectional power transmission line pole-tower foundation slopes, and the method comprises the following steps of acquiring control factors of the rainstorm disaster risks of the pole-tower foundation slopes, and quantizing and normalizing the control factors; establishing a mapping relation between the control factors and a rainstorm landslide accident rate by utilizing an improved BP (Back Propagation) network and adopting disaster statistics and artificial rainfall slope erosion test results as training samples, and acquiring a risk assessment mathematic model; and acquiring the rainstorm landslide risk grade of each slope relative to a whole line by adopting the calculated average rainstorm landslide accident rate value of the whole-line foundation slope as a benchmark value, acquiring a weight vector of each section in terms of percentage for the slope at each risk grade by utilizing an improved layering analysis calculation program, with consideration of different influences of the slope at each risk grade on the rainstorm disaster risks, calculating the weight vector of the slope at each risk grade for the rainstorm disaster by continuously adopting the improved layering analysis calculation program, and finally synthesizing the weight vectors of all layers from top to bottom by utilizing a computer to obtain the risk assessment result of each section.

The invention provides an analysis method of network risks. Firstly, informations, such as topology, weaknesses, services, etc., are collected in order to structure a network attack map; secondly, according to the network attack map, the probability that each weakness is successfully utilized by attackers is calculated; thirdly, the probability of the successful utilization of each weakness is combined with the influence of the weaknesses affecting the services and data of hosts in order to calculate the risks of each weakness affecting the availability, security and integrality of the hosts; fourthly, considering the security requirement of each host, the comprehensive risk of each host is calculated; fifthly, according to the comprehensive risk of each host, the comprehensive risk of a network is calculated. The invention has the advantages of that the influence of the association among weaknesses, which affects the security of hosts and networks, is sufficiently considered and that the quantitative evaluation of the risk states of hosts is carried out according to security requirements, so that the results of evaluation are more real and reliable.

The invention discloses a rainstorm disaster risk evaluation method for a foundation slope of a transmission line tower. The method comprises the following steps of: obtaining disaster causing factors controlling the rainstorm risk of the foundation slope of the transmission line tower according to extensive disaster statistics and artificial rain slope corrosion test statistics; and performing quantification and normalization processing on the disaster causing factors and slope stability, and calculating a weight vector of influence of each disaster causing factor on the disaster causing of rainstorm by adopting an improved hierarchical analysis calculation program; establishing a mapping relationship between the disaster causing factors and a slope stability safety coefficient by adopting an artificial intelligence method and an improved back propagation (BP) network to obtain a mathematical model for evaluating the rainstorm landslide risk of the foundation slope of the transmission power tower; quantifying vulnerability factors, obtaining a weight vector of influence of each vulnerability factor on the disaster causing risk of the rainstorm by adopting an expert analysis method, and establishing a rainstorm risk evaluation mathematical model for the foundation slope of the transmission line tower according to a relationship that the risk is equal to a product of danger and vulnerability; and accurately evaluating the rainstorm risk of the foundation slope of a specified transmission line tower.

The present invention discloses a pipeline water quality risk evaluation method based on a water supply network dynamic model. Establishing a water supply network dynamic waterpower and water quality model and performing accurate checking of the water supply network dynamic waterpower and water quality model through determination of the classification type and the evaluation indexes of the pipeline water quality risk; determining the weight of each evaluation index through adoption of the analytic hierarchy process; and dividing the grading standard of each evaluation index parameters based on the state data samples of the pipe network dynamic model, determining the degree of membership of each evaluation index, performing the fuzzy comprehensive evaluation, and determining the grade of the water quality risk of each pipeline in the pipe network. Though the steps mentioned above, all the pipelines of the whole water supply network are subjected to water quality risk evaluation, and the comparison and the ordering are performed according to the evaluation result to determine risk degree ordering of water quality changing and provide decision support for the management and maintenance of the pipe network; and moreover, the pipeline water quality risk evaluation method based on the water supply network dynamic model overcomes the defects that other evaluation methods are simple in index and do not take incomprehensive consideration, and the evaluation result is more reliable to ensure the accuracy and the life cycle of the evaluation.

The invention provides a service life evaluation method for bus electrolytic capacitors of a motor driver. The method comprises the steps: testing the core temperature of each bus electrolytic capacitor of a driver and the working environment temperature by means of a temperature-sensitive technology, selecting the highest core temperature rise [Delta]T among the electrolytic capacitors, and calculating the core temperature T2 of the electrolytic capacitors when the driver is running in a condition with the upper limit environment temperature. The service life of the bus electrolytic capacitors is calculated according to the difference between the highest allowed core temperature and the T2 as well as correction coefficients of bus voltages, so the service life of the driver can be evaluated. According to the method, the influence brought by the difference between an actual temperature upper limit for a driver and a test environment temperature, the influence of bus voltage when the driver is in use and the influence of uneven temperature rises among bus electrolytic capacitors are all taken into consideration. Aspects are comprehensively considered by the method, and an evaluation result is reliable.

The invention belongs to the technical field of soil fertility evaluation, and discloses a method for evaluating the soil fertility of a purple paddy soil, comprising the following steps: S1) obtaining the value of each soil index in the soil fertility index, and the value of each soil index in the soil fertility index is obtained, and respectively calculating the membership value and the weight coefficient of each soil index according to the value of each soil index; and S2) calculating the comprehensive index value of the soil fertility used for evaluating the soil fertility according to themembership value and the weight coefficient of each soil index. The soil fertility index is composed of soil indexes as follows: bulk density, ph, organic matter, total nitrogen, total phosphorus, total potassium, alkali-hydrolyzable nitrogen, available phosphorus, available potassium, cation exchange capacity, microbial biomass carbon, microbial biomass nitrogen and relative yield. The method for evaluating the soil fertility of a purple paddy soil has the characteristics of comprehensive and reasonable selection of soil evaluation indexes, and realizes comprehensive evaluation of the soil fertility and the productivity.

The invention discloses a short-term monitoring and bearing capacity evaluation method for existing bridges, and belongs to the technical field of highway engineering detection. The method comprises determining a loaded verification coefficient by a quasi-static equivalent load test; determining the static dynamic characteristics of a bridge by a dynamic equivalent load test and an operation loadtest, wherein the quasi-static equivalent load test includes the determination of a test type, the determination of an equivalent vehicle and the installation and commissioning process of a sensor; performing the equivalent load test and the operation load test; performing data acquisition and data processing. The method provided by the invention has less investment in practical application, but has high technical added value; has little impact on traffic, can achieve monitoring and evaluation without traffic interruption, and has a large amount of data that can be processed, complete information, and high evaluation accuracy.