62 results about "Reliability study" patented technology

An array process diagnosis test structure for an integrated circuit including a transistor array composed of vertical FET memory cell access transistors, which are formed into the depth of a substrate in the form of active webs which run parallel in the lateral direction of the circuit is disclosed. Memory cell storage capacitors in the array test structure are formed in deep trenches on the end faces of those sections of the active webs which form the vertical FET transistors. Word lines are arranged along the webs and along parallel intersecting bit lines of the array, outside of which, and on two mutually opposite edges, are located a first and second word line comb. The wordline combs are offset and connected alternately to different word lines. In addition, a first and a second bit line comb are formed on the two other opposing edges of the transistor array mutually offset and each connected to different bit lines. The test structure provides a convenient means to carry out reliability investigations on the gate oxide of the vertical FET transistors and on the capacitor dielectric in the deep trenches, capacitance measurements between the word lines, and between the word lines and other circuit layers, as well as capacitance measurements between the bit lines and between the bit lines and other circuit layers, and thus facilitates diagnosis of possible fault sources arising during the production process.

The invention provides an electric spindle multi-axial fatigue life prediction method and a fatigue life reliability assessment method, and aims to solve the problems that the single-axial fatigue life in the prior art cannot express the electric spindle practical application status; the multi-axial fatigue life prediction method comprises the following steps: using a finite element analysis method to analyze electric spindle stress strain status; predicting the electric spindle multi-axial fatigue life under different rules according to the multi-axial fatigue rules and the electric spindle stress strain status. Data simulation is carried out for a fatigue life single subsample on said basis, thus obtaining multi-group fatigue life data, and assessing the fatigue life reliability according to the multi-group fatigue life data. The method can carry out assessment and reliability research on electric spindle fatigue life under the single subsample according to the simulation result, thus providing technology and data supports for spindle fatigue life assessment in real processing production, and providing basis data for spindle precision life assessment.

A method and system for accurately predicting the remaining useful life of devices and device components based on rigorous statistical analysis data to reduce service costs by implementing condition-based maintenance is disclosed. One such rigorous statistical model is the general degradation path model. The General Path Model is used to generate simulated data that shares similar data characteristics of historical field failure data. This generated data can be used in a reliability study based on Monte Carlo techniques for RUL prediction. The study can be used to investigate the effects of influential factors such as suspension percentage and heavy-tailed behavior. The remaining useful life prediction is based on both the fixed-time predictors (such as the market segment) and the time-dependent covariates (e.g., dark decay, printing rate, etc.). The Random Forest Model can also be used for accurately predicting remaining useful life based on both fixed-time predictors and time-dependent covariates, which are both contained in the field data of a component. A relationship between component failure and amount of degradation makes it possible to use degradation models for accurate predictions of failure time.

A method and structure tests devices on a wafer by applying an electrical bias to the devices and simultaneously monitoring emitted light from all of the devices. The emitted light indicates locations of defective devices and records time-based images of the emitted light across the wafer.

The invention relates to a power distribution network health index assessment method comprising the following steps: 1, determining power distribution network health index connotation and purpose; 2, determining a power distribution network health index assessment object; 3, determining a power distribution network health index assessment index system; 4, evaluating a transformer and distribution equipment health index; 5, evaluating the power distribution network health index. In a long term, the reliability research pays more attention on a single device at certain moment, a single section (static state), a fault result, and a cause and effect relation; the novel method provides a colony equipment and network health index assessment method, can study the colony equipment and network dynamic health level and power supply reliability, can guide power distribution network planning and operation unkeep asset management, can provide equipment and network health status quantification analysis, and macroscopic and microscopic are combined to provide base theory and practical technical means.

The invention discloses a self-correcting redundancy switching mechanism for a spacecraft system and a verification method thereof. The invention adds the redundancy switching mechanism with the feature of self-correcting into the spacecraft system and provides the verification method thereof. The subsystems of the each spacecraft are communicated by a 1553B bus, and are respectively communicatedwith a ground monitor and control system by an Ethernet communication module. The ground monitor and control system immediately detects the fault state of the spacecraft system, and injects fault as well as a control instruction, thereby being capable of significantly improving the high efficiency and the safety of the redundancy switching mechanism of a complex system. By accumulating and optimizing expert opinions, the invention can reduce unnecessary backup switch, has significant research meaning for improving the long-time endurance capability, can immediately switch the fault of a key sensitive part, prevents from an uncontrolled state, and guarantees the safe operation of the system. The method has significant meaning for realizing the reliability research of a spacecraft autonomous intelligent control system.

The invention discloses a support vector machine high-voltage circuit breaker fault diagnosis method based on fuzzy clustering. The method comprises the steps of firstly, extracting a feature vector from a stroke-time curve of a circuit breaker moving contact, using the feature vector as a database of fault diagnosis, secondly, conducting fizzy clustering processing on a data sample, generating a new clustering center matrix, thirdly, using the clustering center matrix as a training sample, applying a support vector machine to conduct training, and fourthly applying the high-voltage circuit breaker fault diagnosis method to diagnose test data. According to the support vector machine high-voltage circuit breaker fault diagnosis method based on the fuzzy clustering, the efficiency of the high-voltage circuit breaker fault diagnosis can be effectively improved, the time of the fault diagnosis is reduced, the quality of the fault diagnosis is improved, and the support vector machine high-voltage circuit breaker fault diagnosis method has great significance for research on the safety and the reliability of the power grid.

The invention relates to dynamic simulation devices and methods for all voltage grades of a power system, in particular to a simulation device and method of the characters of a merging unit of an intelligent transformer substation. The simulation device accords with a DL / T860 communication protocol and has the functions that secondary signals of multiple traditional voltage mutual inductors and current mutual inductors are received; the secondary signals are converted into digital light signals which accord with the DL / T860.92 and the GB / T 20840.8; all characters of the merging unit can be simulated at the same time, wherein the characters comprise the synchronizing and desynchronizing character, frame loss, delay, delay deviation and delay jitter of sampling valve messages, and sampling frequency deviation and jitter; the synchronous mark, the state character and the quality place of the sampling valve messages can be modified in real time, and the sampling valve deviation and superimposed harmonic components can be simulated. The simulation device and method solve the problem that simulation can not be achieved easily for abnormal conditions of the electronic mutual inductors and the merging unit in the dynamic simulation process of the intelligent transformer substation, and can be widely applied to reliability research and testing of secondary equipment of the intelligent transformer substation.

The invention relates to a reliability analysis method in the field of accelerated degradation testing, and in particular to a method based on accelerated degradation electrical parameter for analyzing the reliability of a LED integrated driving power within a LED entire light life cycle based on luminous flux. The method aims at using an electrical parameter to analyze the reliability of the LED integrated driving power so as to obtain the result of influence on the lifecycle of the entire lamp by the driving power. The reliability research for the driving power is based on design perspective. According to the invention, the method aims at addressing the problem of reliability analysis of the integrated driving power within the entire life cycle of the LED lamp, establishes a Wiener-based statistic model in accordance with the accelerated degradation electrical parameter, and conducts model parameter identification in combination with the maximum likelihood method and the MCMC method. The improved identification method reduces sampling requirements with the proviso of better protecting the identification precision by improving the identification method. And eventually, the method can provide a reliability index of the LED integrated driving power within the life cycle of the entire lamp in accordance with the constraints of the life cycle of the entire LED lamp based on luminous flux.

A high resolution circuit and method for facilitating precise measurement of on-chip delays for FPGAs for reliability studies. The circuit embeds a pulse generator on an FPGA chip having one or more groups of LUTS (the “LUT delay chain”), also on-chip. The circuit also embeds a pulse width measurement circuit on-chip, and measures the duration of the generated pulse through the delay chain. The pulse width of the output pulse represents the delay through the delay chain without any I / O delay. The pulse width measurement circuit uses an additional asynchronous clock autonomous from the main clock and the FPGA propagation delay can be displayed on a hex display continuously for testing purposes.

A method and system for accurately predicting the remaining useful life of devices and components based on rigorous statistical analysis data to reduce service costs by implementing condition-based maintenance. One rigorous statistical model is the general degradation path model, which can be used to generate simulated data that shares similar data characteristics of historical field failure data. This generated data can be used in a reliability study based on, for example, Monte Carlo techniques for RUL prediction. The study can be used to investigate the effects of influential factors such as suspension percentage and heavy-tailed behavior. The remaining useful life prediction is based on both the fixed-time predictors and time-dependent covariates.

The invention discloses a wing reliability evaluation system and method based on a response surface method, belonging to the reliability research field of a fixed-wing aircraft wing. The system includes a wing structure test module, a wing structure finite element simulation module, a reliability calculation module, a data storage and a display module. Firstly, the wing structure test module is constructed, and then the wing structure finite element simulation module is constructed. Secondly, the wing structure finite element simulation module is verified and modified through the wing structure test module, and then the reliability is calculated through the reliability calculation module. Finally, the data are stored and displayed through the data storage and display module. The inventionomits the complicated structure calculation inside the wing through the response surface method. Comparison and verification are conducted through the real test data and the simulation system, and thesimulation sampling is supported by the real data. The finite element simulation system is used to simulate the random sampling process of multiple wings, which avoids the sampling process of multiple wings.

The invention discloses a solar collector output probability modeling method based on non-parametric kernel density estimation. The method comprises the following steps of: 1. obtaining hourly meteorological data measured in history and counting according to different years; 2. solving the output value and the bandwidth value of the unit area collector through a non-parametric kernel density estimation model of the output of the solar collector; 3. modifying the nonparametric kernel density estimation model. The method of the present invention can accurately reflect the random characteristicsand variation law of the output of the collector under different time scales, and can be used for planning and reliability research of the photothermal system under the condition of lacking historicaloperation data in the early stage.

The invention relates to a finite element modeling method for simulating a failure short-circuit mechanism of a pressing connection type IGBT device and belongs to the field of large-power semiconductor device failure mechanisms and reliability research. The modeling method comprises the steps that a pressing connection type IGBT failure short-circuit process is simulated, a pressing connection type IGBT device equivalent model of a penetrating pit which is formed by a failure short circuit is built, and the content of aluminum element in the penetrating pit is set, so that the material attribute change of different failure short-circuit processes is formed; the pressing connection type IGBT device is subjected to modeling in a multi-physics field, a pressing connection type IGBT device geometric model is built, and based on the material attribute change of different failure short-circuit processes, the change rules of resistance and thermal resistance in different failure short-circuit processes are subjected to circulating simulation and analog. According to the finite element modeling method, finite element modeling and analysis in the failure short-circuit process of the pressing connection type IGBT device are achieved, a failure short-circuit equivalent model of the penetrating pit is considered, the change of characteristic parameters in the failure short-circuit processof the pressing connection type IGBT device is simulated, and the basis can be provided for failure short-circuit state monitoring of the pressing connection type IGBT device.

The invention relates to a novel multi-factor tactical internet connection reliability simulation method which solves the problem that complex movement modes and terrain environments cannot be comprehensively considered in the research process of tactical internet connection reliability. The method includes the steps: designing and building simulation network scenes in an OPNET, generating combat movement modes by the aid of a two-dimensional normal cloud model, adding the movement modes into the network scenes, adding business operation simulation, collecting simulation data in different movement modes and analyzing the simulation data to obtain a connection reliability curve; newly building same network scenes, adding real terrain data to obtain a connection reliability curve under terrain influence, and researching the influence of the real terrain environments on the network connection reliability. The method improves modeling of the movement modes and the terrain environments in network connection reliability research, solves the problem of difficulty in modeling the complex environments in networks and the movement modes, and builds a foundation for the research of complex factors of tactical internet reliability research.

The invention provides an electronic type current mutual inductor fault identification method based on waveform inversion, which aims to solve the problem existed in an electronic current type mutualinductor fault judgment based on the rogowski coil principle in an existing electric power system. The method comprises the steps that an instantaneous current sudden change amount is input into an input end of an electronic type current mutual inductor, and the output waveform of the output end of the electronic type current mutual inductor is sampled; whether the output waveform is distorted ornot can be determined, whether a system fault except the fault of the non-electronic current type current mutual inductor exists or not can be determined; when the output waveform is distorted, the output waveform is subjected to differential re-integration inversion operation, and when the inversion fails, it is determined that the electronic type current mutual inductor has a fault. According tothe method, the fault points can be accurately positioned according to the inverted waveform features, and technical support can be provided for reliability research and digital relay protection of the electronic type current mutual inductor, and technical support can be provided for the applicability of the electronic type current mutual inductor.

A device used for carrying out a rope performance study on a tandem type rope sheave structure is mainly formed by a mounting base, guide wheel assemblies, rope sheave assemblies, a reducer, guiding sheaves, balancing weights and the like in an assembled mode. Through the adjustment of corresponding assemblies, the study on the rope performance of the tandem rope sheave structure in a circumferential-assembling mode and a linear-assembling mode can be achieved. A trapezoid cut is formed in each rope sheave in the radial direction, through the match of a locking nut and the two side faces of each trapezoid notch, the lengths of tandem ropes are adjusted and calibrated, and the periphery of each rope sheave is marked with scales to calibrate the turn angle deviation between two rope sheaves. The driving force and loads of the device are provided by the reducer having a self-locking function and the balancing weights. The study device not only can carry out the study on rope tension and turn angle deviation performance among the rope sheaves to obtain the synchronism motion and variation law among the tandem type rope sheaves, but also can achieve the study on fatigue reliability of the ropes, and further analyzes factors affecting the fatigue reliability of the ropes.

The disclosure provides a method and device for reliability assessment of a wide area protection system, solving the technical problem that a reliability research result of a current wide area protection system is only limited to reliability research of a communication network thereof, but a reliability analysis model for an overall system does not exist. The method provided by the disclosure includes: S1, acquiring an information acceptance rate d of a wide area monitoring center of a wide area protection system; S2, obtaining the accuracy psf(d) of wide area protection initiation, the accuracy pfz(d) of fault area positioning and the accuracy pfc(d) of fault element recognition according to the information acceptance rate d; and S3, multiplying the accuracy psf(d) of wide area protection initiation, the accuracy pfz(d) of fault area positioning and the accuracy pfc(d) of fault element recognition to obtain the decision accuracy Pdmp of the wide area protection system.

The invention provides an aircraft attitude control ground simulation system effectiveness analysis method. According to the method, by aiming at the three freedoms of an aircraft ground simulation system, four dynamic performance indexes including the overshooting quantity, the stabilizing time, the peak time and the ascending time are selected to be used as similarity units; the similarity degree of the aircraft actual attitude control system output and the ground simulation system output is analyzed and compared according to the similarity theory; the reliability of a simulation system is quantificationally analyzed. The dynamic performance indexes of the three freedoms of the aircraft ground simulation system are used as the similarity units for analysis; the reliability of the simulation system is quantificationally analyzed according to the similarity theory. The analysis method provided by the invention has the advantages that the theoretical basis is reliable; the calculation process is simple; the application range is wide; a new ideal and the reference basis are provided for the reliability study of the simulation system of aircrafts such as unmanned planes and satellites.

The invention provides a reliability modeling and quantitative evaluation method for an FTU in distribution network automation. The reliability modeling and quantitative evaluation method for the FTU in distribution network automation includes the following steps: S1, inputting the reliability parameters of all components, S2, analyzing the influence on the FTU after the components break down, S3, establishing a fault tree of the FTU, S4, analyzing the fault tree, deducing the calculation formula of a top event FTU fault, and calculating the reliability parameters of the FTU according to the reliability parameters of all the components, and S5, outputting the calculation result. The command execution and data acquisition in distribution network automation are both accomplished by the FTU (a switch monitoring device which is mounted beside a feeder line switch), and therefore the reliability of the FTU is of great importance. The reliability modeling and quantitative evaluation method for the FTU is achieved through the study of the reliability of the FTU.

The invention discloses a reliability research method for a tractive power supply system based on a small sample condition, and the method carries out virtual augmentation of small sample data by a Bootstrap method, and effectively solves a problem that a Weibull distribution fitting effect is poor because the actual sample amount of related fault data is small in the prior art. Compared with a traditional SVM algorithm, an LSSVM algorithm has the advantages that the calculation complexity is simplified, and the algorithm convergence precision is improved. Advantages of easy implementation, high precision, fast convergence and the like of the particle swarm algorithm are combined. LSSVM model parameters are optimized by applying the designed PSOLSSVM algorithm, and the optimal parameters of the LSSVM are selected to configure. A tractive power supply system model established by adopting a fault tree analysis method and a BDD algorithm is effectively predicted. The reliability and average failure time of the traction power supply system equipment are obtained, and a reliable scientific basis is provided for an overall equipment maintenance plan of the traction power supply system.

The invention discloses an electric fast transient-based industrial robot servo driver detection method. The electric fast transient is a common and extremely harmful type of electromagnetic interference for an industrial robot control power supply system and has a very rich harmonic component. The method comprises the following steps: 1, a detection system is built; 2, three working conditions and interference pulse parameters of the servo motor are set; 3, a servo motor is selected according to a detected servo driver, and wiring is carried out; and 4, interference pulses are inputted respectively under each working condition to determine the ability of the detected servo driver resisting the electric fast transient. The electric fast transient testing method provided in the invention does not exist in the existing industrial robot field, is particularly applied to the field of industrial robot servo drivers, has high innovation and engineering applicability and improves the reliability study on the industrial robot servo driver.

The present invention provides a full life circle traceable electric energy meter based on the wireless technology, belonging to the electrical device field. The electric energy meter is provided with a memory device which is internally provided with error values corresponding to the electric energy meter, the memory device receives energy through the wireless power supply mode, the memory device is internally provided with parameter values including the error values, and the parameter values comprise timestamp corresponding to the error values, the stage body numbers of the electric energy meter, the manufacture factory numbers and the check position. The full life circle traceable electric energy meter based on the wireless technology performs reading-writing operation of the parameter values in the memory device of the electric energy meter and performs public and private key signature authentication management of the device participating in the write operation to ensure the authority of the parameter values in the memory device so as to realize the analysis of the error recording of the electric energy meter according to the parameter values an provide a good basis for the reliability consideration of the electric energy meter.

The invention discloses a system fuzzy reliability analysis method based on a fuzzy dynamic Bayesian network, and the method comprises the steps: obtaining an SADT graph based on a structural analysisand design method; evaluating a possible fault mode of the system based on the fault mode and an influence analysis method; constructing a DBN model of the system in combination with the SADT graph and a fault mode and influence analysis method; obtaining a conditional probability table and a state transition matrix based on a Markov chain, and introducing a fuzzy set theory according to the obtained DBN model of the system; combining a conditional probability table and a state transition matrix to complete the model construction of the fuzzy DBN of the system; and on the basis of the constructed fuzzy DBN model, based on Bayesian reasoning, adopting MATLAB software for simulation to acquire a result of system reliability analysis. According to the invention, reliability research can be carried out on equipment which is stored in a design analysis stage for a long time and lacks data information; reliability research can be carried out on large aircraft equipment, complex structures and multi-fault-mode products; accurate reliability evaluation can be obtained from engineering fuzzy information.

The invention discloses a stirring friction welding process test platform system and a tool. The stirring friction welding process test platform system comprises friction welding equipment, a workbench, a mechanical detection module, a temperature detection block, a vibration detection module, a machine tool motion control module and a temperature control module; through the machine tool movementcontrol module and the temperature control module, test research under various process parameters of friction stir welding can be realized; effective quality analysis can be formed according to the acquired multi-azimuth welding process parameter characteristics and the welding quality result; and comprehensive control of the force and the temperature can realize the friction wear acceleration test research and research of the reliability of a stirring tool and the equipment.

The invention belongs to the technical field of testing of mechanical equipment reliability, and particularly relates to a loading device and a loading method for testing reliability of an electric spindle. The loading device provided by the invention comprises a push rod bracket capable of being fixedly mounted on a work table of a machine tool, a fastening slide block capable of being fixedly arranged on a surface of the push rod bracket through a locking member, a push rod used for applying load to a loading rod on an electric spindle, a loader capable of sleeving an outer surface of the push rod, and a bearing seat used for sleeving one end of the loading rod, wherein one end of the push rod is pivotably connected to the outer surface of the bearing seat; the other end of the push rod can be connected with the locking member. The loading device and the method provided by the invention can be used to effectively simulate influence of radial force and axial force on the electric spindle; the loading device integrally adopts a mechanical structure, is convenient to use, and is beneficial for improving reliability of research on reliability of the electric spindle.

The invention provides a reliability evaluation method and device of a wide area protection system, and aims at solving the technical problem that reliability research of the wide-area protection system at present is limited to reliability research on the communication network and lack a reliability analysis model for the whole system. The method comprises that S1) an information acceptance rate dof a wide-area monitoring center in the wide area protection system is obtained; S2) according to the information acceptance rate d, the correct rate psf(d) of start of wide-area protection, the correct rate pfz(d) of fault area positioning and the correct rate pfc(d) of fault component identification are obtained; and S3) the correct rates psf(d), pfz(d) and pfc(d) are multiplied to obtain the correct rate pdmp of decision of the wide-area protection system.

A wafer level electrical probe system with multiple wavelength and intensity illumination capability system that enables concurrent reliability studies of illumination stimulation, electrical stimulation, and the interplay of both electrical and illumination stimulation. The probe system includes five sub-systems: a controllable wavelength and intensity illumination input sub-system with two different configurations; a wafer level electrical probe sub-system; an illumination intensity calibration sub-system; an illumination delivery sub-system; and an illumination wavelength calibration sub-system.