39 results about "Double fault" patented technology

A Private Network-Network Interface (PNNI) network including interconnected nodes is defined as a single rerouting domain (“global domain”) and the global domain is further defined by multiple divided domains (“local domains”). Each of the local domains is defined to include multiple nodes that are included in the network. Connection recovery and path optimization in the global domain (the entire PNNI network) are performed in accordance with a global rerouting protocol. The global rerouting protocol is a modification of the standard Domain-Based Rerouting (DBR) protocol, by adding information elements of domain identifier, rerouting for the global domain. The DBR protocol does not support the connection recovery from a link failure between local domains (“inter-domains”) and the global path optimization. The global rerouting method is capable of connection recovery and path optimization outside of any rerouting local domains. The global rerouting provides double fault recovery within the rerouting domain (“intra-domain”) as covered by the DBR and outside of the domains (“inter-domain”) or when the initial fault recovery within the domain has failed. Also, the global rerouting method provides maximum path optimization across all domains and within the rerouting local domain.

Even if business processing is transaction, a standby-type cluster system copes with double faults in a short time while holding down the standby computer cost to the minimum. An execution server monitoring thread in a standby server periodically monitors an operation state of an execution server. Upon detecting time-out as a result of the monitoring, the thread resets the execution server, stops load balancing to an IP address of the execution server, recovers transaction of the execution server, and returns to monitoring of the operation state. If normality of the execution server is detected as the result of monitoring and an operation state in an execution server management table is “stop,” the thread starts the load balancing to the execution server and returns to the monitoring of the operation state.

The invention discloses a method for detecting a grid fault online under the condition of a limited number of PMUs based on the least square method. According to the method, the area disperse policy decision structure is adopted, and the wide area protection information of a home substation and an adjacent substation is collected through RDS; when it is found that protective action is carried out on a circuit, the online detection process of the circuit and an adjacent circuit is started; the current and voltage measurement values of the related PMUs are collected, the current and voltage estimated values of each node are worked out, the current residual value of each circuit is obtained, two suspected circuits are obtained through ranking and searching; for the two suspected circuits, according to the topological link relation between the two suspected circuits, criteria of a fault of a single circuit and combination faults of two adjacent circuits and the like are established; according to three groups of PMU measurement values, the positions of three groups of fault points of each suspected circuit are worked out, fault criteria are established, and then a faulty element is judged and detected. By the adoption of the method, the three fault conditions including the fault of a single circuit, combination faults of adjacent circuits and dual faults of non-adjacent circuits can be distinguished, and the situation that an oversized communication load is added to the SDH of a wide area communication network is avoided.

Provided are a method of detecting and isolating fault in sensors and a method of accommodating fault in sensors using the same. In the method of detecting and isolating fault in sensors, a one reduced-order parity vector is obtained by excluding the output of one sensor selected from n sensors, a two reduced-order parity vector is obtained by excluding output of two sensors selected from the n sensors, and when there are a plurality of parity vectors obtained at plural points of time, one reduced-order parity vectors are averaged to obtain an averaged one reduced-order parity vector and likewise, two reduced-order parity vectors are averaged to obtain an averaged two reduced-order parity vector. Therefore, a decrease in fault detection and isolation (FDI) performance can be hindered, and even when double faults occur, sensors to be excluded can be selected. Thus, a system including sensors has high reliability and high accuracy.

The invention relates to a fault locking method for relay protection in a digital substation. In the relay protection, a plurality of IED (Intelligent Electronic Device) distributed fault detection elements are integrated with various fault identification criterions to effectively identify faults of a power system; a protection device and intelligent unit double-fault locking mechanism is adopted, wherein a process layer communication CPU (Central Processing Unit) on the protection device only releases GOOSE (Generic Object Oriented Substation Event) trip locking and forwards a GOOSE trip signal to an intelligent unit on the premise that a trip command for protecting the CPU and a fault detection FD open command exist simultaneously; and the intelligent unit only releases locking and trips on the premise that the GOOSE trip command and the FD open command are received simultaneously. On the basis of network information sharing, the fault locking method provided by the invention is integrated with various fault identification criterions to effectively identify the fault of the power system by adopting the plurality of the IED detection elements, and prevents false tripping caused by IED abnormality so as to improve the reliability of the power system.

The invention relates to a lightning interference and lightning fault identification method, particularly to a PSO (Particle Swarm Optimization) improved atomic decomposition method based lightning interference and fault identification method. The frequency component analysis is performed on voltage and current signals formed at the fault line protection installation position by an atomic decomposition method, a lightning interference identification method based on the existence of a zero sequence current steady state power frequency component is proposed, double fault type identification criterions based on the current line mold component atomic decomposition energy ratio and the fault phase current electromagnetic transient characteristics are proposed, and accordingly the accuracy of fault identification is improved. According to the PSO improved atomic decomposition method based lightning interference and fault identification method, optimal match atoms and parameters of the atoms of signals are self-adaptively found on the basis of an over-complete redundant atom library and accordingly the adaptive expression of the signals can be simple, the decomposition result can be sparse, the information density and the use flexibility are greatly improved, and the processing cost is reduced.

The invention discloses a train automatic protective system safety control circuit, method and vehicle. The train automatic protective system safety control circuit comprises an ATP module and a vehicle emergency braking module, and the ATP module is connected with a vehicle emergency braking relay of the vehicle emergency braking module through an ATP emergency braking relay. When the ATP faults,the ATP emergency braking relay is disconnected, thus the vehicle emergency braking relay is disconnected, and emergency braking is conducted on the vehicle. According to the train automatic protective system safety control circuit, the ATP emergency braking relay is arranged, emergency braking can be automatically applied to the vehicle firstly to guarantee immediate stopping of the vehicle whenthe ATP system faults under any circumstances of the vehicle, and then the operation of separation of the ATP system is conducted by a driver. Even under the extreme case that double faults occur oncritical electric component of the vehicle, automatic traction force cutting off can also be achieved through the vehicle, the speed of the vehicle is lowered, and operation safety of light rail vehicles is improved.

The invention discloses an online grid fault detection method based on relative protection entropy and nominal transition resistance. According to the method, when a regional online detection system operating in a main unit on the monitoring layer of a transformer substation finds out that a protection signal, corresponding to a protection device, of a certain circuit in the station is started, online grid fault detection is started, seven kinds of protective action values of the two ends of the circuit and adjacent circuits are collected through a local area network and a wide area communication network, the relative protection entropy values of the circuit and adjacent circuits are calculated and ranked from large to small, circuits the relative protection entropy values of which are ranked first and second are taken as suspected circuits, and the relative protection entropy values of the two circuits are compared with a relative protection entropy threshold value to judge the fault circuit with multiple criteria. According to the method, the relative protection entropy fault detection method and the limited PMU-based nominal transition resistance fault detection method are combined, faults of a single circuit, double faults of two non-adjacent circuits and complicated faults of two adjacent circuits can be detected effectively, and fault tolerance of grid fault detection is improved greatly.

The invention discloses a method for preparing low-immunogenicity pig dermal support. The method comprise the following steps of: (1) preparing double fault derma; (2) performing acellular treatment; (3) performing matrix metalloproteinase-7 treatment; and (4) performing vacuum freeze drying treatment. The low-immunogenicity pig dermal support is manufactured by using pig skin as a raw material, aiming at maintaining low-immunogenicity ingredients of pig dermal collagenous fiber and the like and natural three-dimensional structures based on the low-immunogenicity ingredients, removing (eliminating) high-immunogenicity ingredients such as cell and stromatin (such as laminin and fibronectin), and using means of skin material taking and treatment improvement, acellular method optimization, dematrix protein technique establishment, cross-linking agent optimization, vacuum freeze drying technique and the like. According to the method, the purposes of reducing the pig dermal immunogenicity to the level which ensures that the human body can be tolerated and synchronously maintaining the natural three-dimensional structure of the pig skin so as to guide 'ordered' regeneration and reconstruction of human derma in an orginzation mode of in-situ construction organization engineering are reached; and the problems or the prior art are solved.

Provided is a method for assessing risks and weak links of a power grid, with double fault probability characteristics considered. Firstly, system basic technical data, system running constraint condition data and component reliability data are acquired from an electric power system planning department. Then, the basic power flow distribution situation of the system is calculated. According to the load shedding amount and the system N-1 fault state probability of the N-1 condition and the load shedding amount and the system N-2 fault state approximate probability of the N-2 condition, risk participation factors of the Expected Power Not Supplied (EPNS) of the system of an electric generator or power transmission equipment are calculated. The risk participation factors are ranked. If the risk participation factor of some component is relatively large, then the component is relatively weak in the power grid and is a weak link of the power grid. In the invention, since double fault and probability information is considered, calculation results are relatively accurate and achieve relatively great reference value. The method of the invention significantly reduces computing resource consumption and shortens the computing time while guaranteeing the accuracy of system probability indexes.

The invention belongs to the field of inertial navigation systems, and particularly relates to a six gyroscope redundant strapdown inertial navigation system double fault isolation method. The methodcomprises the following steps that output data of a redundant strapdown inertial navigation system inertial device is collected, and output values of a gyroscope and an accelerometer at different moments are obtained; a generalized likelihood ratio fault detection method is adopted to detect faults, and if a fault happens, the fault moment is recorded; a double fault isolation method based on maximum likelihood estimation is adopted to conduct fault isolation; a fault isolation method based on reduced-order odd-even vectors is adopted to conduct fault isolation; a fault information matrix R isdetermined, and system reconfiguration is conducted according to a system reconfiguration formula. By the adoption of the six gyroscope redundant system double fault detection and isolation method, two inertial devices which fail at the same time can be accurately detected and isolated, and thus the reliability of the inertial navigation system is guaranteed; therefore, the method can improve thenavigation system performance more comprehensively and meet the actual application requirements for long time and high reliability of the navigation system.

The invention relates to a rotary sealed material discharging device including a material inlet, a material outlet, a valve body and a star rotor. The star rotor is connected with a transmission shaft through shaft couplings, and the star rotor comprises a plurality of multilateral cabins each composed of V-shaped separating plates each shaped as a 'V' font. The bottom of each cutting edge is positioned by a regulating block and then is connected by wear resistant bolts. The interior of the material inlet is provided with double fault protection of a buffer and an alarm cut-off device, so as to prevent overloading and material clamping effects on the device. The rotary sealed material discharging device aims to improve opportunities of reducing material clamping, do multiple preventive measures, ensure the device operation rate, improve the service life, and have convenient maintenance.

The invention provides a fault simulation method of logic circuit single-particle double-fault. The method comprises the following steps: the first step: executing single-particle double-fault positioning in a target logic circuit so as to search for a target logic gate pair; the second step: determining a type of the searched target logic gate pair; the third step: in allusion to circuit logic ofthe target logic circuit, acquiring normal circuit response in the case that input excitation is applied to the target logic circuit; and the fourth step: in allusion to the target logic circuit, executing double-fault simulation, adding a non-logic gate to the output end of at least one logic gate in the searched target logic gate pair, and acquiring circuit response in the case that the input excitation which is the same as that in the third step is applied to the whole target logic circuit after the non-logic gate is added.

The invention discloses an electric power system multiple fault type conversion and time domain control simulator based on RTDS. The simulator comprises a fault trigger angle selection module, a fault trigger main channel module, a dual fault trigger channel module, a fault type selection module, a single or dual fault selection module and an operating button interface, wherein faults are applied to different trigger angles according to the requirements so that single or dual fault setting can be realized; the single or dual fault duration and the interval time between dual faults can be controllable; and through a function switch, a phase-to-phase fault, a relative fault and an off-line fault for arbitrary single-phase or multi-phase can be realized in an electric power three-phase system. The electric power system multiple fault type conversion and time domain control simulator based on RTDS can effectively reduce the model scale and save the RTDS computing resource, and has no need for realizing setting of multiple fault types through frequent model modification so that the workload of an operator is reduced and the simulation efficiency is improved.

The invention relates to an adaptive protection level method under double faults of an elastic optical network, and belongs to the field of optical communications. The method comprises the following steps: S1, generating a service set, marking the service type, and initializing a network topological resource; S2, dynamically updating a Metrics value of each link in the network, and recording a proportion of spectrum resource usage on the link; S3, calculating K shortest paths for an incoming service, calculating fk(u) and loadk values of the path, and selecting a best transmission route; S4, calculating an available idle spectrum block of the transmission path, matching the available spectrum resources, and recording; S5, according to the current service type, calculating the available protection path and protection resource through an APLA algorithm, and recording the same; and S6, allocating the corresponding spectrum resource through the recorded transmission path and protection path, and returning the related path and resource information. The method in the invention avoids excessive use of resources on some links and can adaptively select protection levels according to different request types and spectrum resource usage states and ensure normal transmission of services under a condition of limited resources.

The invention discloses a product test method based on adjacent unit double faults. The product test method comprises the following specific steps: (1) establishing an adjacent unit double fault set of a system according to a correlation model of the system; (2) establishing and simplifying the adjacent unit double fault correlation matrix of the system to obtain a simplified matrix; (3) evaluating the adjacent unit double fault diagnosis capability of the system; (4) optimizing a test for fault detection and establishing the detection policy of the adjacent unit double faults; (5) optimizing a test for fault isolation and establishing the isolation policy of the adjacent unit double faults; and (6) carrying out a product test. According to the invention, a system fault diagnosis theory of single fault is expanded to the multi-fault mode of the adjacent unit double faults on the basis of correlation model of the system; and by establishing the adjacent unit double faults, the identification method of the adjacent unit double fault of the system is provided, and the correlation matrix of the adjacent unit double faults of the system is established.

The invention provides a nano integrated circuit reliability evaluation method under the influence of multiple transient faults, comprising the following steps: 1, establishing a circuit reliability calculation formula of the nano integrated circuit to be evaluated; 2, determining the parameter value of the zero-fault direct current component in the reliability calculation formula; 3, performing single-fault simulation on a nano integrated circuit to be evaluate to evaluate a first-order principal component in a circuit reliability calculation formula; 4, carrying out dual-fault simulation onthat nano integrated circuit to be evaluated; 5, carrying out probability statistical analysis on the data obtained from the double-fault simulation to evaluate the second-order components in the circuit reliability calculation formula.

The invention discloses a redundant internet communication system of a wind turbine generator. The system comprises the components of: a first ring network and a second ring network, wherein the firstring network is connected to the second ring network through an on-site control unit of at least one wind turbine generator, the first ring network and the second ring network are both provided withconvergence layers, and the first ring network and the second ring network are both used for receiving data communication and forwarding data to the convergence layers. According to the redundant Internet communication system of the wind turbine generator, the redundancy problem under the condition of double faults is solved, and the requirements for real-time performance and rapid self-healing performance of industrial communication can be met.

We disclose a method of tagging a variety of pharmaceutical or nutritional products in which well-studied chemicals may be added to the products in unique ratios. The identities of the chemicals and their relative ratios comprise unique taggants. The taggants may identify which of multiple distinct categories the product falls within. The method includes the step of systematically varying the relative concentrations of the chemicals resulting in multiple ratios of the chemicals. The plurality of ratios of a defined set of chemicals may be collected to form a library of taggants associated with specified items or categories. As the number of chemicals added per product increases, the library supports more categories and the system is less likely to produce a false positive. The method may result in a series of taggants for each item which is single fault tolerant or double fault tolerant.

The invention discloses an electric power system multiple fault type conversion and time domain control simulator based on RTDS. The simulator comprises a fault trigger angle selection module, a fault trigger main channel module, a dual fault trigger channel module, a fault type selection module, a single or dual fault selection module and an operating button interface, wherein faults are applied to different trigger angles according to the requirements so that single or dual fault setting can be realized; the single or dual fault duration and the interval time between dual faults can be controllable; and through a function switch, a phase-to-phase fault, a relative fault and an off-line fault for arbitrary single-phase or multi-phase can be realized in an electric power three-phase system. The electric power system multiple fault type conversion and time domain control simulator based on RTDS can effectively reduce the model scale and save the RTDS computing resource, and has no need for realizing setting of multiple fault types through frequent model modification so that the workload of an operator is reduced and the simulation efficiency is improved.