111 results about "Fault detection rate" patented technology

The invention discloses a high-voltage equipment monitoring system and method based on thermal imaging and dynamic sensing fusion of a power plant, and belongs to the field of high-voltage equipment monitoring. The edge intelligent processing module is used for outputting a real temperature field matrix, separating equipment vibration characteristics from environment noise and generating a fused characteristic vector; the multi-modal analysis module is used for inputting the feature vectors into a constructed equipment topological graph neural network and outputting a health index and an abnormal probability distribution diagram of each monitoring point; the environment coupling fault analysis module is used for generating a fault diagnosis report; and the dynamic early warning module is used for executing graded early warning according to the health index and the fault diagnosis report. The fault detection rate and the operation and maintenance efficiency can be improved.

The invention relates to the technical field of electronic circuits, in particular to a construction method and system of a high-speed differential signal transmission model. The method comprises the following steps: acquiring design data of the printed circuit board, and extracting differential signal line data; constructing a high-speed differential signal transmission model according to the differential signal line data; performing signal transmission simulation based on the high-speed differential signal transmission model to obtain high-speed differential signal transmission data; identifying a crosstalk source position based on the high-speed differential signal transmission data to obtain a crosstalk source coordinate; detecting via hole dislocation based on the crosstalk source coordinates to obtain via hole dislocation data, and evaluating a heat accumulation degree based on the via hole dislocation data; identifying an electrical fault area of the circuit board based on the heat accumulation degree; and extracting stack structure information according to the printed circuit board design data. Based on the electronic circuit technology, the precision and reliability of the high-speed differential signal transmission model are improved, and the signal transmission quality and the electrical fault detection rate are remarkably improved.

The invention provides an equipment fault diagnosis method based on multi-scale image convolution, and relates to the technical field of industrial equipment intelligent fault diagnosis, and the method comprises the steps: extracting the time domain, frequency spectrum domain and time-frequency features of a vibration signal through a multi-scale input layer, and generating a 32-dimensional feature vector through the fusion of a cross-scale feature coupling module; and constructing an inter-equipment relation perception graph convolution model, generating a dynamic adjacency matrix in combination with a physical distance and a real-time working condition, and extracting space-time fusion features through space-time convolution. Transient and periodic features are enhanced through an accidental fault sensitive time sequence module, and time sequence features are output in combination with dual-channel fusion and a self-attention mechanism. And finally, fault identification and positioning are realized by adopting a double-threshold detection and equipment comparison enhancement strategy, an interpretable diagnosis evidence chain containing multi-scale feature contribution is generated, and the weak fault detection rate and the diagnosis credibility are improved.

The invention relates to the technical field of water pump fault diagnosis, discloses a condensate pump shafting vibration fault diagnosis method and device based on multi-parameter analysis and a medium, and solves the problems of sensor signal distortion and noise interference of a condensate pump under high-temperature and high-humidity working conditions through multi-source data fusion and environment adaptive compensation. Dynamic time-frequency domain feature extraction and an improved lightweight residual network are adopted, and efficient decoupling and accurate recognition of multi-fault concurrent features are achieved; the fuzzy inference rule base and the shafting fluctuation propagation model are combined, the fault positioning precision and the early fault detection rate are remarkably improved, scientific and reliable technical support is provided for diagnosis and maintenance of the shafting vibration fault of the condensate pump, and safe and stable operation of factory equipment is effectively guaranteed.

The invention relates to the technical field of industrial data, discloses a mining equipment state monitoring method and system based on the Internet of Things, and effectively solves the problem of insufficient model generalization ability caused by scarcity of fault samples of mining equipment. The virtual sample generation technology expands the available training data volume by 3-5 times, so that the early fault detection rate is improved to 85% or above. The self-adaptive feature selection mechanism reduces the consumption of computing resources by more than 30%, and maintains the integrity of key fault features at the same time. The multi-stage early warning system realizes accurate grading of fault severity, so that the maintenance resource distribution efficiency is improved by about 40%. The closed-loop optimization mechanism enables the model to continuously evolve in the operation process, and the annual false alarm rate is reduced by about 15%. The explainable diagnosis report provides a clear technical basis for field maintenance, and the average troubleshooting time is shortened by about 50%.

The invention discloses a multi-dimensional intelligent analysis and fault traceability system for ACU final test data, and relates to the technical field of data analysis. The multi-source heterogeneous data acquisition module is used for acquiring operation parameters, function test data and assembly data through a CAN bus, test equipment and a production system, and is provided with a high-precision timestamp; the data cleaning and preprocessing module is used for standardizing data, filtering and denoising, synchronizing time and complementing missing values; the multi-dimensional feature extraction module is used for extracting features from a time domain, a frequency domain, a time sequence and a space; the intelligent fault diagnosis module is used for classifying faults by using a random forest and a D-S evidence theory and evaluating severity; the fault traceability reasoning module is used for constructing a fault propagation graph and positioning root causes through a Bayesian network; and the visual display and early warning module is used for generating a three-dimensional fault tree and a thermodynamic diagram and triggering graded early warning. According to the invention, the fault detection rate and traceability efficiency are improved, the false alarm rate is reduced, early warning is realized, the ACU test process is optimized, and the product quality and safety are guaranteed.

The invention discloses a fault diagnosis method and a fault diagnosis system for an electric valve actuating mechanism. The method comprises the following steps: synchronously acquiring signals through an anti-EMI (Electro-Magnetic Interference) multi-source sensor; adopting complex Morlet wavelet packet decomposition to extract a 1.2-2.4 kHz energy entropy minimum frequency band, and calculating a kurtosis index; separating the third harmonic of the current through variational mode decomposition, and calculating the total distortion rate of the third harmonic; a graph attention network with 12-dimensional features is constructed, and weighted fusion is carried out through a multi-head attention mechanism; the lightweight CNN outputs a fault type, and when the confidence coefficient is less than 0.9, a knowledge graph rule engine is triggered; and updating a threshold value based on a historical diagnosis clustering result, and aggregating edge model parameters by federal learning. The system comprises a wafer-level micro-strain sensing layer, an FPGA accelerated edge computing layer, a cloud platform supporting federated learning, and an AR maintenance guidance and block chain evidence storage module. The early fault detection rate is improved, the false alarm rate under strong EMI is reduced, and the average repair time is shortened.

The invention relates to an airplane airborne BIT system testability verification method based on a correlation model, and the method comprises the steps: carrying out the testability modeling of an object system, and obtaining a dependency relation model which describes the relation between a fault mode of the object system and a test method of the object system; based on the dependency relationship model, obtaining a BIT theoretical fault report set of each fault mode under all test methods by utilizing reachability analysis, and deducing an optimal diagnosis fault fuzzy group; constructing a fault sample library, verifying the BIT theoretical fault report set by using samples in the library, and adjusting the dependency relationship model according to a verification result; and performing fault simulation based on the verified dependency matrix, and calculating a total fault detection rate and a fault isolation rate of the object system according to a generated fault report. According to the method, the isolation rate index of the fault can be effectively verified in the incomplete and unformed stage of the fault diagnosis strategy.

The invention discloses a vibration signal processing method based on self-adaptive wavelet packet and deep learning fusion, and belongs to the field of sewage plant equipment fault diagnosis. The method aims at solving the problems that traditional signal processing is poor in flexibility, the non-stationary signal processing capacity is weak, the deep learning data requirement is large, and the high-frequency weak feature capturing capacity is limited. According to the method, the high-frequency acceleration sensor is adopted, the vibration signals of the sewage plant equipment are accurately collected, the self-adaptive wavelet packet decomposition technology is applied, the primary function is dynamically selected, the number of decomposition layers is optimized, self-adaptive threshold noise reduction is achieved, and the signal processing quality is improved. Meanwhile, in combination with a one-dimensional convolutional neural network and a bidirectional LSTM model, local and global features of the signal are extracted respectively, and pre-processed data are formed through gating weighted fusion. According to the method, the signal-to-noise ratio and the weak fault detection rate are remarkably improved, feature redundancy and data requirements are reduced, the calculation efficiency and diagnosis accuracy are improved, the method is suitable for sewage plant equipment fault diagnosis, and the industrial applicability is enhanced.

The invention relates to the technical field of port equipment evaluation, in particular to an optimization method for port large-scale machine equipment state evaluation, which comprises the following steps: S1, multi-source heterogeneous data collaborative acquisition; s2, data preprocessing and feature enhancement; s3, carrying out multi-modal feature fusion modeling; s4, state evaluation of transfer learning driving; s5, dynamic threshold early warning and residual life prediction; and S6, model optimization under a federated learning framework. According to the method, the early fault detection rate is changed from 82% to 95% through multi-modal fusion, the false alarm rate is reduced by 60%, the diagnosis precision is improved, a dynamic threshold value adapts to working condition fluctuation, the maintenance cost is optimized, the prediction error for the residual life is smaller than or equal to 15%, excessive maintenance is avoided, the replacement period of key components is prolonged by 30%, and accurate state evaluation can be carried out.

The invention discloses a health monitoring method and device for industrial equipment. The method comprises the following steps: acquiring a target multi-modal feature vector set; performing time sequence alignment and feature fusion processing on the target multi-modal feature vector set to obtain a target fusion feature vector sequence; inputting the target fusion feature vector sequence into a target equipment health state prediction model for processing to obtain a target equipment collaborative analysis result; obtaining health state prediction data of the target equipment according to the collaborative analysis result of the target equipment; generating a target equipment fault root cause diagnosis report, a target equipment maintenance suggestion and a target risk assessment report; and performing optimization processing on the target equipment health state prediction model according to the target equipment actual operation data, the target equipment fault root cause diagnosis report, the target equipment maintenance suggestion and the target risk assessment report. According to the invention, the fault detection rate of industrial equipment can be improved, the false alarm rate can be reduced, and organic combination of millisecond-level abnormal response and deep historical analysis is realized.

The invention discloses a bullet train wheel set ultrasonic wear detection device, and particularly relates to the technical field of rail transit detection, and the bullet train wheel set ultrasonic wear detection device comprises an ultrasonic probe module which comprises a multi-frequency composite probe array and a self-adaptive coupling structure and is used for carrying out all-directional scanning on a wheel flange, a tread and a rim of a wheel set; and the signal processing module is connected with the probe module and comprises a noise reduction unit, a feature extraction unit and a real-time early warning unit. According to the invention, the multi-frequency composite probe array and matrix layout are adopted, deep crack and surface wear detection is considered, the omission ratio is reduced, and the efficiency is improved by more than 30%; a liquid immersion type structure and a three-degree-of-freedom mechanism guarantee stable detection and adapt to more than 99% of vehicle models; accurate recognition is realized through a WT-CNN algorithm and the like, and the false alarm rate is reduced by 40%; the modular design adapts to multiple scenes, and the fault detection rate reaches 99.5% through full-dimensional diagnosis; the equipment adapts to an extreme environment, the service life is prolonged, the single-wheel detection time is finally shortened, the labor cost is reduced, and the overhaul efficiency and the rail traffic safety are remarkably improved.

The invention relates to the technical field of signal processing, in particular to a mechanical vibration state monitoring method and system for a main shaft. The method comprises the following steps: acquiring a spindle vibration signal; performing abnormal signal analysis according to the spindle vibration signal to obtain an abnormal vibration signal; determining the abrasion of the rolling bearing based on the abnormal vibration signal to obtain bearing abrasion data; performing oil film degradation detection according to the bearing wear data to obtain oil film degradation data; performing material hot corrosion analysis based on the oil film degradation data to obtain material hot corrosion data; evaluating the structural deformation degree of the bearing seat based on the material hot corrosion data to obtain deformation data of the bearing seat; drawing an oscillogram according to the abnormal vibration signal; recognizing a vibration abrupt change point according to the oscillogram; and according to the vibration abrupt change point, carrying out fastening structure looseness analysis to obtain fastening structure looseness data. Based on the signal processing technology, the accuracy of abnormal mechanical vibration identification of the main shaft and the early fault discovery rate are improved.

According to the fault early warning system for the wind power booster station provided by the invention, the limitation of traditional single-point monitoring is broken through by fusing the infrared ultrasonic technology and the ultrahigh frequency technology through the non-contact sensor, so that the early fault detection rate is greatly improved; the composite heat dissipation system suppresses the temperature rise of a transformer hot spot based on a dynamic heat management mechanism of a phase change material and a heat pipe, and the energy-saving efficiency is improved; the edge calculation early warning center converts temperature, partial discharge, strain and other multi-source heterogeneous data into a unified health degree index through a weighted fusion algorithm, and in combination with an equipment topology correlation analysis model, the positioning accuracy of a fault source is greatly improved, and the early warning response time delay is greatly reduced.

The invention provides a multi-modal process fault detection method based on SKDPC-RS-MSDAE, which is used for solving the problems that multi-modal division depends on experience knowledge, the detection precision of tiny faults is low and the like. The method comprises the following steps: firstly, collecting original data of a TE multi-mode process, and mining deep information of the original data by using ResNet; secondly, a DPC modal identification method based on path selection is designed, local density and relative distance are reconstructed through path selection and kNN, an optimal clustering number judgment criterion based on a contour coefficient is constructed, and a DPC based on the contour coefficient and path selection is designed; secondly, establishing an MSDAE detection model for each steady state, and obtaining a corresponding fault probability; and finally, designing a Bayesian reasoning probability index BIP based on multi-probability fusion. Experimental verification is carried out through the TE process, compared with other methods, the overall fault detection rate is improved, and the detection performance of tiny faults is improved.

The application provides an ECC attack-resistant method, device, equipment and medium suitable for a car security chip. The application adjusts the points accumulated in the scalar average decomposition method, so that the operation operations in each cycle are the same, that is, each cycle performs point multiplication and point addition. In this way, the branch in the operation process can be eliminated, the power consumption attack cannot identify the leakage of sensitive information, and the problem that the false operation mode cannot meet the high fault detection rate required by the car chip ISO 26262 is avoided. In the case of increasing a small amount of calculation and pre-storing points, the application can achieve the beneficial effects described above.

The invention discloses an aircraft intelligent fault detection method for different task scenes, and relates to the technical field of aircraft fault detection, the method combines the advantages of a domain adversarial network (DANN) and a mixed expert model (Mixture of Experts, MoE), the shared features of a source domain and a target domain are extracted through the DANN, the data distribution difference is reduced, and the generalization ability of the model is improved; a plurality of expert sub-models are constructed through MoE, and data of different task scenes are dynamically allocated to corresponding experts by a Router module, so that efficient processing of multi-modal data is realized. Experimental results show that the fault detection rate of the method in a multi-task scene reaches 99.55%, the false alarm rate is reduced to 1.40%, and the method is remarkably superior to a traditional method. The method can be widely applied to fault detection of the unmanned aerial vehicle in a complex flight environment, and provides technical guarantee for safety and reliability of the unmanned aerial vehicle.

The application relates to the technical field of vehicles, in particular to a test method and device of an electric drive system, electronic equipment and a storage medium, wherein the method comprises the following steps: obtaining an electric drive test requirement of a to-be-tested electric drive system; controlling a load simulator, an environment simulator, a simulated charging pile and a battery simulator to provide at least one test state for the to-be-tested electric drive system according to the electric drive test requirement; obtaining test information output by the to-be-tested electric drive system in the corresponding test state, so as to generate a test result according to the test information. Thus, the problem of single test dimension and insufficient dynamic performance evaluation in the electric drive boost charging test method is solved, the real complex working condition is reproduced by synchronously applying electrical, thermal and control multi-dimensional stress, the dynamic response capability and control robustness of the system are quantitatively evaluated through step disturbance and transient mode switching, and the fault detection rate and the research and development efficiency are improved.

A system testability prediction method based on an aero-engine functional architecture comprises the following steps: determining system test architecture data according to the aero-engine functional architecture; based on the system test architecture data, obtaining a fault mode probability lambda Di capable of being correctly tested by the ith basic-level maintainable function unit and a fault rate lambda i of the ith basic-level maintainable function unit, and establishing a system fault detection rate rFD mathematical model; obtaining a function fault mode probability lambda Ii which can be isolated to an ith basic level maintainable function unit, and establishing a system fault isolation rate rFI mathematical model; obtaining a fault mode probability lambda Ai that the i-th basic-level maintainable function unit with the test function may generate a false alarm, and establishing a system inherent false alarm rate rFA mathematical model; and system testability prediction is completed. The method can be used for scheme design of aero-engines and other complex products, system testability prediction in the detailed design stage and evaluation of whether the scheme design of the aero-engines meets testability quantitative index requirements or not.

The invention discloses a fault early warning method for a chemical equipment explosion-proof inspection robot based on vibration analysis, and belongs to the field of robot fault early warning. Comprising the steps of multi-source vibration data acquisition and anti-explosion signal processing, vibration-environment multi-source data fusion diagnosis, statistical process control (SPC) vibration health assessment, anti-explosion environment self-adaptive early warning mechanism and graded early warning and maintenance decision. According to the chemical equipment anti-explosion inspection robot fault early warning method based on vibration analysis, the Db4 wavelet denoising technology is adopted, the fault detection rate is greatly improved compared with a traditional method, mechanical faults and electrical risks are accurately distinguished, the ATEX highest anti-explosion standard is achieved, the sensor self-healing capacity is achieved, the system reliability is improved, and the fault early warning effect is good. Through the daily increasing trend of the entropy value of the vibration envelope spectrum, faults are pre-judged 72 hours ahead of time, most of accidental shutdown losses are reduced, meanwhile, three-level response strategy synergy is achieved, similar vibration modes are combined through the K-means clustering algorithm in each quarter, and the annual diagnosis precision is improved.

This invention discloses a blast furnace ironmaking process monitoring method based on RBNCVA. First, a stacked denoising autoencoder (SDAE) is used to model historical blast furnace fault data, extracting robust wide nonlinear features. This feature helps to handle the complex nonlinearity of the blast furnace ironmaking process and is resistant to interference from noise and outliers. Then, a canonical variate analysis (CVA) method is used to analyze the relationship between past and future feature vectors to address the dynamic nature of the blast furnace. Finally, statistics are calculated using a probability density function obtained using kernel density estimation. This method reduces the false alarm rate in the blast furnace ironmaking monitoring process and significantly improves the fault detection rate and fault sensitivity.

The invention discloses a multi-target test selection method and system under a test uncertainty condition based on E domination guidance. The method comprises the following steps of: firstly, explicitly modeling uncertainty in a test process by using a detection probability matrix and a false alarm probability matrix; secondly, establishing a multi-objective optimization model which takes the minimum test cost, the minimum missing report rate and the minimum false alarm rate as objectives and takes the fault detection rate and the fault isolation rate as constraints; introducing an E domination relation fused with the preference of a decision maker to improve a traditional Pareto domination criterion; on the basis, designing an E-GPSO algorithm fusing a genetic algorithm and particle swarm optimization to perform iterative search, and dynamically maintaining a non-inferior solution set by adopting an external file based on an E domination criterion; and finally, outputting an optimal test scheme set meeting the constraint and the preference. According to the method, the test cost and the diagnosis reliability can be effectively coordinated and optimized, the decision space is remarkably reduced, and the efficiency and the quality of testability design are improved.

The invention discloses a fault diagnosis method for communication confrontation equipment, and relates to the technical field of fault diagnosis of the communication confrontation equipment, and the method comprises the steps: obtaining various fault monitoring data of the communication confrontation equipment at a plurality of test moments, and obtaining a time domain data matrix; performing smooth filtering processing on each element in the time domain data matrix to obtain a time domain data matrix after smooth filtering; performing short-time Fourier transform on each element in the time domain data matrix after smoothing filtering to obtain a frequency domain data matrix; arranging all elements in each row in the frequency domain data matrix according to a sequence of frequencies from large to small to obtain an arranged frequency domain data matrix; averaging all elements of each column in the arranged frequency domain data matrix to obtain an average value matrix; and determining a fault diagnosis result of the communication confrontation equipment according to the average value matrix. According to the invention, the fault detection rate of the communication confrontation equipment is improved.

The invention relates to a carrier roller skin damage fault diagnosis method based on distributed sound and temperature fusion monitoring in the technical field of coal mine underground conveying equipment fault monitoring. The carrier roller skin damage fault diagnosis method sequentially comprises the following steps of S1 sound and temperature data acquisition, S2 data preprocessing, S3 wear feature extraction, S4 sound and temperature fusion diagnosis model training and S5 fault diagnosis and mathematical model verification. Aiming at a core pain point of an existing carrier roller wear fault diagnosis technology, through synchronous data acquisition, targeted preprocessing, fault sensitive feature extraction, attention weighted fusion and full-process optimization of a robust classification model, a technical breakthrough is realized, the problems of time alignment and quality of multi-source data are solved, the distinguishing capability of different wear types is improved, and the fault diagnosis accuracy is improved. The diagnosis accuracy and the anti-interference generalization ability are improved, the fault detection rate is guaranteed, and key fault omission is avoided.

This invention provides a method for determining the polymorphic availability of unmanned aerial vehicles (UAVs). This method comprehensively considers the available, degraded, and faulty states of UAVs, identifies the primary influencing factors and other related states for each of these three states, and constructs a polymorphic availability model for the UAV using a generalized stochastic Petri net. This model is then solved using a Markov chain to determine the probabilities of the UAV's available, degraded, and faulty states. The method also analyzes the relationship between combinations of different fault detection rates and spare parts availability rates and the UAV's available, degraded, and faulty states. This method can be further applied to equipment such as unmanned vehicles and unmanned boats, providing important professional technical support for their development, construction, and operational support.

The present application relates to the technical field of boiler heating surface fault diagnosis, and particularly relates to a heating surface fault diagnosis and prediction method and system based on boiler flow field analysis. The method comprises the following steps: collecting multi-dimensional data of the boiler; performing internal flow field analysis of the boiler; constructing a heating surface fault diagnosis model; coupling the flow field simulation results and the fault diagnosis model to construct a fault prediction model; extracting features and reducing dimensions; using a Gaussian mixture model to perform fault mode recognition; calculating a comprehensive fault score and performing risk classification. The present application significantly improves the accuracy of fault diagnosis and the early warning time by fusing flow field analysis, deep learning and multi-source data. Experimental results show that, compared with traditional methods, the fault detection rate of the present application is increased to 96.7%, the false positive rate is reduced to 3.2%, the early warning time is extended to 12.3 hours, and the diagnosis accuracy is 94.1%. The present application provides strong support for safe and efficient operation of the boiler, and has important engineering application value.

The application provides a process micro-fault detection method based on stationary subspace integrated probability slow features, and belongs to the technical field of industrial process fault detection. The technical scheme is as follows: the application is composed of an offline stage and an online stage. The application fuses the stationary information of SSA and the time sequence dynamics of SFA to form complementary feature description, finally realizes fine division of non-stationary multivariate data through integrated learning, realizes effective extraction of micro-fault probability information, and greatly improves the micro-fault detection rate.

This invention discloses a monitoring method and system for the preparation process of ternary cathode materials based on RVAE. It constructs a nonlinear dynamic system model of the sintering process based on a variational autoencoder; assigns different weights to samples at different times in the constructed nonlinear dynamic system model of the sintering process, derives the loss function of the nonlinear dynamic system model of the sintering process, and trains the model parameters through backpropagation; defines the statistics of the nonlinear dynamic system model of the sintering process based on the cyclic variational autoencoder, and obtains the control threshold of the nonlinear dynamic system model of the sintering process through kernel density estimation; collects online data as a test set for the nonlinear dynamic system model, calculates the monitoring statistics online and compares them with the control limits to determine whether a fault has occurred. This invention can significantly improve the fault detection rate and false alarm rate, providing a strong guarantee for the stable operation of the sintering process.

The present application relates to the technical field of fault diagnosis of air-conditioning units, and specifically to a method for fault diagnosis of water-cooled precision air-conditioning units. When applied, the present application can perform multi-dimensional diagnosis, combining compression conditions, compressor vibration, and evaporation and condensation data, covering electrical, mechanical, and thermal system faults. False alarms are eliminated through time correlation, thereby improving diagnostic reliability. Moreover, after calculating the correlation quantity, the correlation between each fault can be quantitatively analyzed, and different levels of fault diagnosis evaluation can be performed for different correlation quantities. The focus can be on monitoring signals with high correlation quantities, and higher priority and more computing power can be provided for signal monitoring with high correlation quantities. The present application significantly improves the fault detection rate and diagnostic efficiency of precision air-conditioning units, performs correlation evaluation on each fault, and can perform multi-dimensional diagnostic evaluation on the fault.

The invention discloses an intelligent fault diagnosis method and device for a complex aerospace system based on correlation modeling, and relates to the technical field of aerospace system fault diagnosis, and the method comprises the steps: constructing a testability model of the aerospace system; the distinguishing capability of different faults is simplified, and test points are optimized; automatically generating a fault diagnosis strategy based on the optimized testability model; performing simulation evaluation on the fault diagnosis strategy, and counting a fault detection rate and a fault isolation rate; and performing iterative optimization by judging whether the fault detection rate and the fault isolation rate meet preset requirements or not. According to the method, the technical problems of low diagnosis efficiency and insufficient fault detection and isolation accuracy caused by dependence on artificial experience and incomplete static fault tree coverage of complex spaceflight system fault diagnosis in the prior art are solved, intelligentization and precision of complex spaceflight system fault diagnosis are realized, and the fault diagnosis efficiency is improved. And the fault detection rate and the isolation rate are improved.