110 results about "Life assessment" patented technology

A method and system for performing continuous (real-time) physics based prognostics analysis as a function of actual engine usage and changing operating environment. A rule-based mission profile analysis is conducted to determine the mission variability which yields variability in the type of thermal-mechanical loads that an engine is subjected to during use. This is followed by combustor modeling to predict combustion liner temperatures and combustion nozzle plane temperature distributions as a function of engine usage which is followed by off-design engine modeling to determine the pitch-line temperatures in hot gas path components and thermodynamic modeling to compute the component temperature profiles of the components for different stages of the turbine. This is automatically followed by finite element(FE) based non-linear stress-strain analysis using an real-time FE solver and physics based damage accumulation, life consumption and residual life prediction analyses using microstructural modeling based damage and fracture analysis techniques.

The invention provides a fiber grating-based transformer internal temperature detection system, which comprises a light source, fiber grating sensors, a grating signal demodulation system, a signal processing display instrument and data analysis software, wherein the fiber grating sensors are arranged on a winding and a strut of a transformer and sensing points at other positions in the transformer and used for sensing measurement of transformer temperature, stress and local discharge parameters; the grating signal demodulation system receives the measured data of the fiber grating sensors, and accurately demodulates corresponding light signals of the temperature, stress and local discharge parameters; the signal processing display instrument performs correction processing such as temperature compensation, stress sensitivity removal and the like on the measured signals, and displays real-time data on an instrument panel; and the data analysis software performs programming software analysis on the processed data to acquire real-time transformer internal temperature field and temperature change, and then performs transformer internal temperature monitoring and full service life assessment. The system realizes real-time measurement of temperature of multiple points in the transformer through the photoelectric sensors, and provides a good foundation for economic operation of the transformer.

The invention provides a wind turbine set gearbox remote online state monitoring and life assessment method. The method comprises the following steps: (1) a remote center computer collects a real-time operation parameter, temperature data and vibration data of each wind turbine through SCADA; (2) through analyzing the characteristic values of signal time domain and frequency domain, whether a vibration sensor has a fault or not is diagnosed; (3) the data is subjected to normalization process, a difference between data is reduced, and the diagnosis precision is raised; (4) when the fault of a wind generator set gearbox is diagnosed, different filtering modes are employed for different algorithms to extract the corresponding characteristic; (5) the collected data is subjected to characteristic extraction; (6) the fault diagnosis is carried out to provide the fact that whether the fault exists or not and the degree of the fault; (7) the residual life of the failed gearbox is estimated through a gray theory model, and an autoregression model is established for the residual error of the predication result to raise the predication precision. According to the method, the real-time estimation of the residual life is realized, and a basis is provided for the planned maintenance of the wind turbine set.

The invention provides an integrated Phased Array (PhA) structural radar transducer, permanently bonded to a structure, that can provide reliable electromechanical connection with corresponding miniaturized electronic SHM device installed above it. The integrated PhA transducer consists of a set of aligned piezo-electric discs with wrap around electrodes for transceiving of elastic ultrasonic waves, plurality of electrical traces and contact pads, several layers of a flexible printed circuit board, electromagnetic shielding between channels and overall, one electromechanical multi-pinned connector and all that integrated into one small unit easy for surface installation by bonding and final application on real structures. The integrated PhA transducer, as a key component of SHM (Phased Array Monitoring for Enhanced Life Assessment) system, has two principal tasks to reliably transceive elastic waves and serve as a reliable sole carrier or support for associated sophisticated SHM electronic device attached above.

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.

The invention belongs to the technical field of material science and engineering and relates to a forecasting method of the creep life of a high-temperature material. With the rise of working temperature, the probability of creep failure of high-temperature equipment and high-temperature mechanisms and the ponderance of accidents caused by the creep failure in modern industry are both increased greatly. The forecasting method of the creep life of the high-temperature material comprises the following steps of: acquiring data of material at different temperatures, wherein each test point comprises temperature, stress and fracture time; calculating the test data to obtain a P value that each test stress Sigma corresponds to according to a formula; conducting LH parametric method curvilinear regression to obtain a main curve of an LH regression curve, wherein the mathematical expression of the regression curve is lg Sigma=A0+AIP+A2P2+...; and calculating creep life under different temperatures and stress conditions on the regression curve. The invention has the advantages of improving the forecasting precision of the creep life of the material and the reliability of life assessment and having wide application range and simple forecasting method.

The invention relates to an accelerated life test method of an aircraft brake system. The environment conditions of applying temperature stress, vibration stress and the like in a combined way are adopted, the operating conditions are added and the operating frequency of the whole system are increased during the test process, so that the hidden fault dangers of the brake system are stimulated, and the test time is shortened. The method is circularly carried out according to the test profile during the test process until the required reliability index is reached. The power-on operating conditions, the brake applying pressure operating conditions and the rotating speed change conditions in use are converted into the test time according to the applied operating frequency, and the operating frequency adopted in the test is greater than the actual operating frequency in use. The reached reliability index is assessed according to the method in GJB1407 and recommended degree of confidence after the test is finished, and the degree of confidence for assessing the reliability index is 90%; and the empirical coefficient of life assessment is 1.5. The purpose of performing the accelerated life test on the brake system is realized by verifying whether the brake system has hidden fault dangers under various operating states.

The invention relates to an electronic complete machine storage life assessment and prediction method. On the basis of analyzing a typical complete machine failure mechanism, an Arrhenius model-basedcomplete machine level acceleration factor calculation method is proposed; the method can perform electronic complete machine acceleration factor calculation by only three parameters; an accelerationtest is performed according to a calculation result and data is obtained; by utilizing an optimized GM(1,1) grey model-based prediction algorithm, a degradation law of natural storage and accelerationtest data is researched; the consistency of degradation trends of two groups of data is analyzed; closed-loop correction of acceleration factor calculation model parameters is realized by utilizing aconsistency analysis result; and finally electronic complete machine storage life prediction is realized by utilizing a corrected model. The method is simple and easy to understand and relatively high in prediction precision, and is suitable for engineering popularization.

The invention discloses a crosslinked polyethylene cable residual life assessment method which comprises the following steps: residual breakdown voltage of a cable is obtained; and aging rate of the cable is calculated according to the cable aging rate formula of Sd=(H*E-Sy)/N, wherein Sd is aging rate, Sy is residual breakdown voltage of the cable, H is major insulation design thickness of the cable, E is major insulation design anti-electric field intensity and N is operational number of years of the cable; and residual useful life is calculated according to the residual useful life formula of SK=(H*E-SZ)/Sd-N, wherein SK is residual useful life of the cable and SZ is end-of-life voltage of the cable. The step of obtaining the residual breakdown voltage of the cable further comprises the following steps: major insulation resistance between each cable conductor and a copper mask tape is measured; power frequency voltage is applied between each cable conductor and the copper mask tape; and a power-frequency step-by-step breakdown voltage test is carried out so as to obtain the cable main insulation based residual breakdown voltage.

The present invention provides a lithium ion battery cycle life detection device and a lithium ion battery cycle life assessment method. The lithium ion battery cycle life detection device comprises two bottom plates and pressure sensors, the two bottom plates are arranged parallelly, and a to-be-detected lithium ion battery is located between the two bottom plates. The pressure sensors are respectively installed on the opposite side surfaces of the bottom plates and the to-be-detected lithium ion battery, and the output ends of the pressure sensors are connected with a signal processor electrically. According to the above lithium ion battery cycle life detection device, the pressure sensors are arranged on the bottom plates, when the charge and discharge cycle tests are carried out on thelithium ion battery, the lithium ion battery expands in the thickness direction, the pressure sensors can reflect the pressure change caused by the lithium ion battery thickness change to the signalprocessor timely, and by a relation schema of the cycle number of times and the capacity attenuation rate and the pressure change, the cycle life of the lithium ion battery can be assessed. The abovedetection results are more accurate, and the assessment method is simpler and is stronger in adaptability.

The invention discloses a train door fault prediction and health management system. The system involves the following steps of S1, a pre-verification process, wherein a door mirror model is established, original data is injected, and key parameters in the mirror model are continuously corrected by means of system identification; S2, an arrangement and inference process, wherein big data is used for analyzing and pre-verifying door system fault diagnosis, prediction and door component life assessment, and verified algorithms are deployed to a background to form the core of an operation monitoring and intelligent operation and maintenance module. The train door fault prediction and health management system adopts actual data and virtual data for calibrating the mirror model to obtain the digital form of an actual real train door system, uses the big data for operation, simulates many faults which cannot be implemented on a train or an experimental bench, perfects the mirror model, and achieves the pre-verification of the algorithms for providing a basis for the fault prediction and health management.

The invention relates to a bituminous pavement service life assessment method based on a material damage accumulation level. Quantization is carried out on the traffic load circulation, low temperature and freezing and thawing cycle subjected by a pavement in operation, the pavement damage accumulation level is worked out through a given calculation method, and then the pavement service life can be assessed. According to the pavement service life assessment method, the pavement disease development process is shown, and needed pavement preventive maintenance measured can be determined when no crack, track, pit slot or other disease occurs on the pavement. By means of the method, the structure interior damage accumulation conditions produced in the use process of all levels of highways, urban roads, factory roads, airfield runways and the like can be quickly and accurately assessed, and a basis is provided for finding recessive diseases in a pavement structure early and preventing rapid extension of road apparent diseases.

Disclosed is a matching and life assessment method of an automobile transmission bearing; based on the common structure, operation gears and the supporting positions of the automobile transmission, the transmission support shaft is used as the basic unit to establish the transmission shaft force models and the analysis calculation modules under the transmission system proposals; the modules are processed with force analysis separately; the modules are independent mutually and can be combined according to the requirements. The concrete steps are as the followings: a) firstly, a transmission system proposal is selected to process the system model selection and the analysis computation module selection; b) the vehicle performance and the relative structural parameters of the transmission are inputted to process the force analysis of the transmission shaft modules; c) the bearing with a certain type and model is selected to obtain the parameters of the selected bearing for the check calculation of the service life of the bearing; d) when the calculated service life values of the bearing modules cannot satisfy the expected service life values, different bearings can be selected in the bearing database to repeat the mentioned steps; e) the proposals are processed with comparison calculation to obtain the satisfactory results; finally, the proper bearing is selected.

The invention discloses an unrestrictive expected operation life assessment method for a distribution network lightning arrester under a given confidence level. The method comprises the following steps of: 1, monitoring the lightning overvoltage amplitudes at the installation position of the lightning arrester in one year, and counting the amplitude distribution; 2, calculating the statistical distribution of lightning impact discharge capacity resource consumption of the lightning arrester in one year; and 3, calculating the unrestrictive/restrictive lightning overvoltage expected life of the lightning arrester under the given confidence level. According to the method, the lightning overvoltage serving as a decisive factor of the service life of the lightning arrester for a distribution network is analyzed, a route and a method for calculating lightning discharge capacity resource of the lightning arrester for the distribution network and one-time lightning arrester lightning discharge capacity resource consumed by overhead circuit overvoltage due to lightning are further introduced, and finally, the expected operation life of the lightning arrester for the distribution network is calculated by adopting simplified parameters and the method.

The invention discloses an SF6 breaker remaining life assessment method and belongs to the technical field of breakers. The SF6 breaker remaining life assessment method comprises the steps of confirming the information amount for breaker remaining life assessment by analyzing factors influencing the breaker life assessment, dividing state quantities into basic parameters, operating parameters and defect management parameters according to established project models, using a analytic hierarchy process to confirm weight allocation of the state quantities, establishing a breaker three-layer parallel life assessment model based on a health index formula, and using the established formula to analyze and calculate the health level index, the remaining life and the fault probability of a breaker. The method is used for judging the life of a high-voltage breaker in an incomplete life test and is especially suitable for a product with a long life cycle. Possibility is provided for operation cost saving of a power system and improvement of operation safety of the power system.

The invention discloses an electronic-complete-machine-storage-life assessment method and device. The method includes the steps that performance degradation data and the natural storage time of an electronic complete machine are obtained; a degradation data trend model is established according to test samples in the performance degradation data, and the forecasted service life of the electronic complete machine is obtained according to the degradation data trend model and verification samples in the performance degradation data; accelerated factors are obtained according to the natural storage time and a pre-established accelerating model; the characteristic service life of the electronic complete machine is obtained according to the forecasted service life of the electronic complete machine and the accelerated factors. According to the electronic-complete-machine-storage-life assessment method and device, the performance degradation data of the electronic complete machine is analyzed, the service life of the electronic complete machine is assessed according to the analyzed result, the accelerated factors of the electronic complete machine are analyzed based on storage time of the electronic complete machine, the characteristic service life of the electronic complete machine is further assessed in cooperation with the assessed service life and the accelerated factors, and the electronic-complete-machine-storage-life assessment method and device have the advantage of being high in assessment accuracy.

The invention provides a crankshaft remanufacturing life assessment system and a method thereof. The crankshaft remanufacturing life assessment system comprises: a fatigue load loading system used for loading fatigue load to an ex-service crankshaft according to preset test parameters; a machine vision detection system used for detecting the surface crack generation and the crack length of the dangerous position of the ex-service crankshaft to obtain the crack length expansion rule of the crack length with the fatigue cycle; a metallic magnetic memory detection system used for detecting the crack depth of the ex-service crankshaft to obtain the crack depth expansion rule of the crack length with the fatigue cycle; and a processing system used for calculating the crack area expansion rule of the crack area of the ex-service crankshaft with the fatigue cycle according to the crack length expansion rule and the crack depth expansion rule. The remaining fatigue life of the ex-service crankshaft is determined according to a corresponding relationship between the crack area and the remaining fatigue life, and the method is more reliable than present technologies to assess the crankshaft remanufacturing life.

Embodiments of the present invention include strut based overrunning pulleys that provide one or more of greater durability, lower heat generation, high torque loads carrying capability, potentially tunable vibration dampening, tunable to maximum permissible torque loads before elastic (repeatable) slippage, and/or ease of end of life assessment. In some embodiments, a pulley assembly includes a shaft; a pocket plate having a plurality of pockets; a notch plate adjacent the pocket plate and having a plurality of notches facing the pockets of the pocket plate; a plurality struts disposed in the pockets; a resilient member disposed within the pockets and biasing the struts towards the notches; and a body disposed about the shaft, pocket plate, and notch plate; wherein one of the pocket plate or the notch plate is rotationally coupled to the shaft and the other of the pocket plate or the notch plate is rotationally coupled to the body.

The invention discloses a life assessment method of atmospheric corrosion of low-alloy corrosion-resistant steel. The life assessment method simulates an atmospheric environment where the low-alloy corrosion-resistant steel exists. According to the method, a corrosion life prediction model is established, an electrochemical polarization test is performed, therefore, the acceleration rate of corrosion can be quickly calculated, the corrosion life of the material is assessed, and the method has high reliability and high relativity. The method is wide in application, short in time, low in cost and high in accuracy, solves the defects of existing evaluation methods, is suitable for corrosion research and corrosion life rapid evaluation on all types of low-alloy corrosion-resistant steel in various atmospheric environments and has important significance for both application and popularization of the corrosion-resistant steel.

The invention relates to an online life assessment system and method of a thermal power plant steam pipeline. The system comprises a utility boiler, a low pressure cylinder, an electric generator, anintermediate pressure cylinder, a high pressure cylinder and a computer; the life of the steam pipeline can be assessed online as required, the metal technical supervisory means is enriched, and meanwhile, improvement on the running security of the generator is facilitated; preliminary life assessment can be performed and risk pre-warning can be performed on the basis of not damaging the existingsteam pipeline; a great deal of temperature and pressure data are recorded and analyzed, and combined with large and small corrected metal detection data and microstructural detection results, and thus deformation-fatigue life assessment is achieved via a rebuilt algorithm preset in the computer. According to the system and method provided by the invention, manpower resource liberation and a greatdeal of metal detection work are achieved by combining with the actual steam pipeline life assessment, and meanwhile, the pipeline sampling economic losses without purposes and within a large range are avoided, so that the system and method have good economic benefits and social benefits, and the problem in present high-temperature high-pressure metal key life assessment is solved.

The invention relates to a boiler four-pipe real-time service life evaluation method considering wall thickness reduction and overheating influence, and belongs to the technical field of metal materials. The method comprises the following steps: (a) calculating the pipe wall thinning condition by a system according to the operating environment and material characteristics of four pipes of a boiler; (b) calculating the thinning rate of four pipes of the boiler, and (c) calculating the remaining life of the thinned boiler pipe according to a strength checking theory; (d) calculating the stress of the position of the weld joint for the boiler pipe with the weld joint; (e) correcting the remaining life; (f) evaluating the service life of the boiler tube from the perspective of the temperatureand the lasting strength of the boiler tube; (g) correcting and calculating the service life of the boiler tube under the condition of exceeding the designed and calculated wall temperature and overheating; and (h) evaluating and calculating the comprehensive service life Rf of the boiler tube under the combined action of wall thickness reduction and overheating. According to the method, the failure factors of the four pipes of the boiler can be comprehensively covered, and the state and the service life can be accurately evaluated.

Embodiments of the invention provide a life acceleration model creation method and device and a life assessment method. The life acceleration model creation method comprises the following steps of: selecting a preset quantity of test sample sets; for each test sample set, obtaining a life data set, under a double-stress level, of each test sample in the test sample set; and establishing a life acceleration model according to each piece of life data in the life data sets and a preset degradation track. According to the life acceleration model creation method, life data of test samples under thedouble-stress level formed by temperature stress and vibration stress is comprehensively considered, so that the established life acceleration model is closer to practical working condition, the practical demands are satisfied and the test time can be effectively shortened at the same time.