36 results about "Isolation rate" patented technology

The invention discloses an optimization method for a multiple target fault test based on a discrete particle swarm optimization, which takes fault detection rate and fault isolation rate of 100 percent as a primary goal, and as a particle fitness function, carries out optimization to a test point by using the discrete particle swarm optimization. An elite set Xlen1 is introduced for storing a plurality of optimization results which meet the primary goal, a subsequent goal hides and conceals the fault and carries out the optimization in the elite set Xlen1, with the result being a global optimum test set Xlen2. A test set Xlen3 which meets the fault test goal that the number of the test points is smallest and the test cost is lowest is found out on the basis of the global optimum test set Xlen2, then the test set Xlen3 meets the multiple target fault test that the fault detection rate and the fault isolation rate are 100 percent, the average number of fault hiding and fault concealing is smallest, the number of the test points is smallest and the test cost is lowest, thus achieving the aim of the multiple target optimization of the fault test.

A fault location method includes steps: 1, establishing correlation matrix between fault pattern and tested item, 2, optimizing correlation matrix through fault location rate FDR and failure isolation rate FIR, 3, optimizing correlation matrix through maintenance data, 4, when single board gone wrong, according to optimized correlation matrix positioning fault device. Said invention utilizes Bayes' theorem to calculate single board fault probability and determining replacing which device according to probability to realize fault positioning. Said invented method has continuously modification positioning function.

The invention discloses a relevance model-based testability prediction method. The method comprises the following steps: indicating the relevance relationship between each component and a test point through defining the interconnection relationship between the function flow direction of a product and each component as well as the position of the test point, and establishing a test relevance model of the product; obtaining a relevance matrix according to the test relevance model; and calculating the relevance matrix to obtain a fault detection rate and a fault isolation rate index of the product so as to complete the testability prediction work of the product and solve the problem that a project prediction method is not strong in operability. The method is particularly suitable for the testability prediction of products when the data such as fault rates and occurrence frequencies of various fault modes at the initial development stage of the products.

The invention discloses a board-level circuit testability index calculation method which comprises the following steps: constructing a dependency matrix Du irrelevant with the signal flow and position by virtue of combining device information in a circuit according to a test information database; calculating according to the dependency matrix Du to obtain the maximal fault detection rate; reconstructing the dependency matrix Du to obtain a restructuring matrix; realizing isolation of devices at different positions in similar devices; calculating according to the restructuring matrix so as to obtain the maximal failure isolation rate; calculating the failure isolation rate selected by the current test according to the Boolean vector selected by the test. Therefore, by virtue of construction and reconstruction of the Dependency matrix Du irrelevant with the signal flow, calculation of various testability indexes in a board-level circuit is realized.

The invention relates to a method for designing a PHM (Prognostic Health Management) system model development and verification platform, which is used for supporting development and simulation verification for a PHM system model and algorithm of aviation equipment. The design method of the invention comprises a PHM model development method, a data management method and a PHM model simulation verification method. The PHM model development and verification platform can solve a problem of model engineering development and verification, and performs effective modification on the model according toa verification result, thereby improving the fault detection rate and isolation rate of the equipment and system, and achieving a purpose of saving the maintenance time and the maintenance cost.

This invention relates to one portable device trigger control screen accuracy adjust method, which comprises the following steps: through one preset standard detection isolation, one first threshold value and second one as base for adjust; then recording several points time lags to compute one first sample trigger isolation rate and one near trigger isolation to get one second sample trigger isolation rate; finally comparing near isolation and standard detection isolation and comparing second sample trigger isolation rate and first threshold value or comparing second sample trigger isolation rate and second threshold value to determine standard isolation adjust.

The invention relates to an ant colony algorithm and related matrix based optimizing method for a sequential fault diagnosis strategy. The method comprises four major steps, namely, encoding and building a model, constructing fitness functions, building a model for the sequential fault diagnosis strategy, and optimizing the model. According to the method, the multi-signal model building technology is carried out to obtain related matrix of representation system faults and test dependency, and the fitness functions, a state transition rule of the ant colony algorithm and an information feedback mechanism are defined to convert the diagnosis strategy optimization into ant colony optimization; three strategies, including dynamic adjusting of permeates, information compressing and adapting of degree of congestion are introduced for improving the rate of convergence and optimization capacity of the ant colony algorithm, and therefore, the precision of the optimal design method of the diagnosis strategy and the robustness of the results are improved. The method is consistent with the principle of the minimum cost, namely, the search cost is minimized on the premise that the fault detection rate and isolation rate are ensured, and the requirement on fault strategy optimization is met.

The invention provides a virtual simulation test method. The virtual simulation test method comprises constructing a test model and performing failure analysis on the constructed model. The virtual simulation test method is feasible and effective in the evaluation of modeling analysis of a product testability design, and can be used for evaluating the product testability design in related fields, so that the testability design is improved; the inherent testability of products is improved; and valuable suggestions are given to further failure diagnosis of equipment and optimization of an existing test method. Through implementation of the virtual simulation test method, the failure detection and isolation time can be shortened greatly, so that the maintenance time is shortened greatly; technical requirements on maintenance personnel are lowered; the task reliability is improved; the use efficiency of a system and the equipment is increased; and the cost in a life cycle is lowered. A failure detection rate (FDR) can be up to 95-98 percent; a failure isolation rate (FIR) can be up to 95-99 percent (isolation to a single LRU); and a false alarm rate (FAR) can be up to 1-5 percent.

The invention discloses a method and device for quantitatively selecting test points in test design, belonging to the field of test optimization design, including step 1: establishing a correlation matrix between failure modes and test points; step 2: according to the correlation matrix, Define testable parameters detection rate (FDR) and isolation rate (FIR) respectively; Step 3: Establish constraints: FIR>β; optimize the objective function: Step 4: Use traversal search or intelligent search algorithm to obtain the test point set that makes the objective function value Fx the smallest, and this test point set is the optimal test point set; compared with the prior art, the present invention can effectively improve large-scale and complex The design-for-test effect of the avionics system improves the detection rate and isolation rate of design-for-test indicators, and reduces the design-for-test cost.

The invention provides an embedded test method of phase-locked loop circuits, which realizes the build-in self-test and fault diagnosis of a phase-locked loop, and increases the fault detection rate and the fault isolation rate of the phase-locked loop. The embedded test method comprises the following steps: step one, designing the testability of a phase-locked loop circuit; step two, verifying and evaluating testable points obtained in the step one, so as to obtain the fault detection rate and the fault isolation rate of a system; step three, designing hardware-testable points of each composition module of the phase-locked loop system, performing fault detection and isolation; step four, testing output frequency of the phase-locked loop, judging whether the phase-locked loop is in failure or not, if YES, controlling an analog switch to open the phase-locked loop, applying excitation to further testing each functional unit of the phase-locked loop, querying a fault dictionary, and displaying fault contents; otherwise, ending the test.

The invention relates to the field of iron and steel smelting, in particular to the field of slag pot isolation spraying coatings, and discloses a slag pot isolation spraying coating. The slag pot isolation spraying coating is prepared from, by mass, 85-92 parts of high bauxite clinker with the particle size smaller than or equal to 200 mesh, 3-10 parts of powdery graphite and 3-5 parts of portland cement. A preparing method includes the steps that the materials are prepared; the high bauxite clinker and the portland cement are stirred for 20 min to 40 min under the condition of 80 DEG C to 90 DEG C; the mixture is subjected to cold cutting to be at the room temperature, the graphite is added, the mixture is stirred to be even, and the slag pot isolation spraying coating is obtained. The invention further discloses an applying mode of the spraying coating. According to the slag pot isolation spraying coating, the preparing method and the applying mode, the pot isolation rate of slag pots can be 99% or above, persistent attachment hardly exists on slag pots, the damage rate of slag pots can be effectively reduced, the production efficiency can be improved, and the unnecessary production input can be reduced.

The invention relates to the field of manufacturing of exterior wall waterproof and protective paints for buildings and specifically discloses a cured type waterproof protective and thermochromic paint and a preparation method thereof. The cured type waterproof protective and thermochromic paint is prepared from a component A and a component B; the component A is prepared from 50-90 parts of curing agent and 0-100 parts of diluent in parts by weight; the component B is prepared from 100 parts of waterproof film forming agent, 0.5-40 parts of ultraviolet separant, 0-25 parts of thermochromic color-changing agent and 0-5 parts of dispersant in parts by weight. The cured type waterproof protective and thermochromic paint has the capabilities of effectively isolating moisture from seeping into a protected inkjet decoration coating and effectively isolating the corrosion of acid rain to the inkjet decoration coating, is remarkable and adjustable in thermochromic effect and has the isolation rate to ultraviolet up to 83%. The preparation method disclosed by the invention is simple and feasible and can be applied to industrial production.

The invention discloses a method for inspecting the faults of object devices, a system and a device therefore. The method comprises: establishing a test link between one object device and a JATG test bus; testing the object device, and if the data feedback to the JATG controller is abnormal or there is not data received, considering that the object device has faults. The method can improve fault isolation rate, thus being convenient for maintenance, and can improve bus speed and bus reliability.

The invention discloses a method for determining the diagnosability of an angular rate measuring sensor of a satellite based on a correlation matrix. The method comprises the following steps of: (1) dividing functional modules of the angular rate measuring sensor, establishing a signal flow diagram of each module, and marking specified measuring points in the signal flow diagram; (2) performing failure mode and effect analysis (FMEA) on the angular rate measuring sensor, determining the failure mode, failure occurrence probability, failure severity and failure effects of the angular rate measuring sensor, and according to the failure effects, adding the failure mode into the signal flow diagram; (3) establishing a failure-measuring point correlation matrix; (4) assigning the failure-measuring point correlation matrix; (5) according to the failure-measuring point correlation matrix D which is established in the step (4), performing failure detectability analysis on the angular rate measuring sensor; (6) according to the failure-measuring point correlation matrix D which is established in the step (4), performing failure isolability analysis on the angular rate measuring sensor; and(7) determining the diagnosability of the angular rate measuring sensor, and measuring the diagnosability according to failure detection rate RD and failure isolation rate RI.

The invention provides a method for optimizing a ship system testability index. The method comprises the following steps that: S1: establishing a complex system typical task model; S2: carrying out system FMECA (Failure Mode Effects and Criticality Analysis); S3: simplifying a system task model; S4: establishing a testability model; S5: selecting a test point, and establishing a system diagnosis tree; S6: estimating the testability; and S7: optimizing the testability index. By use of the method for optimizing the ship system testability index, the FMECA and diagnosis tree logic analysis are carried out to do the testability design optimization work for the ship complex system to improve testability indexes including a fault detection rate, a fault isolation rate and the like to enable theship complex system to meet the development requirements of a ship product, and therefore, the method is the method for optimizing the ship complex system testability index, is mature in technology, simple, easy in implementation and convenient in popularization and is suitable for engineering application.

The invention relates to a fault isolation rate distribution method, which mainly comprises the following steps of: step 1, constructing a diagnosis architecture of a to-be-distributed system, and determining to-be-distributed units; step 2, acquiring the failure rate, the maintenance time, the failure mode and the influence analysis and failure type of any unit to be distributed; step 3, determining a weighting factor of each distribution unit according to the failure rate, the maintenance time, the severity level in the failure mode and the failure mode type, wherein the weighting factor comprises a failure rate factor ki, a failure influence factor kFi, a maintenance time factor kMi and an in-machine failure diagnosis level influence coefficient kDi; and step 4, performing testability distribution according to the weighting factor and the fault isolation rate of the to-be-distributed system. The method pays attention to engineering practice, is high in operability, and gives consideration to specific conditions of different systems; Accuracy and precision of distribution results can be improved, designers of a system and equipment can be better guided and constrained to carry out corresponding testability design, and effective implementation of testability work is guaranteed.

The invention discloses a rare-earth-free spheroidized core-spun yarn and application thereof in spheroidal graphite casting, wherein the core-spun yarn is prepared from steel sheet coated core powder, and the core powder consists of the following components in percentage by mass: 28-32% of Mg, 43-46% of Si, 2-4% of Ca, 8-10% of Ba, and the balance of Fe and impurities, wherein MgO is less than orequal to 1.5%. Application of the rare-earth-free spheroidized core-spun yarn in the spheroidal graphite casting comprises the following steps: batching, smelting, sand-mixing, core-making, modeling,casting, process inspecting, sand dropping and quality inspecting, wherein the casting step comprises inoculating, spheroidizing and casting forming, and the spheroidized core-spun yarn is applied tothe spheroidizing step. According to the technical scheme provided by the invention, the rare-earth-free spheroidized core-spun yarn is free of rare-earth element accumulation, is less in cementite forming element amount, is small in cementite tendency, has a cementite isolation rate lower than or equal to 0.5%, improves spheroidizing quality, saves core-spun yarn feeding-in amount, realizes rare-earth-free pure magnesium spheroidizing, and reduces production cost.

The invention belongs to the technical field of discrete quantity and analog quantity acquisition, and particularly relates to a discrete quantity and analog quantity normalized acquisition circuit and method. The discrete quantity and analog quantity normalized acquisition circuit comprises a signal configuration unit, a switching matrix 1, a switching matrix 2, a one-out-of-four switch, a rangeconfiguration unit, an A / D converter and a logic control unit, wherein the signal configuration unit is connected with the switching matrix 1 and the switching matrix 2; the one-out-of-four switch isconnected with the switching matrix 1, the switching matrix 2 and the range configuration unit, and the A / D converter is connected with the range configuration unit and the logic control unit. In theinvention, the system uses one conversion channel in discrete quantity input and analog quantity input, realizes acquisition of the discrete quantity input according to a voltage acquisition method and has the characteristics of small size, low power consumption and light weight; and meanwhile, the system has a complete interface protection function and BIT mechanism and is accurate in fault location, high in isolation rate and high in reliability.

The invention discloses a formula and making method of frozen burnt cheese paste. The making method comprises the following steps of mixing cream with butter, reprocessed cheddar cheese, cheddar cheese, sugar and other ingredients, then making burnt cheese paste semi-finished products through an intermittent ultrasonic-assisted chopping technology, performing decompressed rapid freezing to obtainthe frozen burnt cheese paste, and performing packaging to obtain products. The frozen burnt cheese paste is unfrozen, the unfrozen burnt cheese paste is applied on bread or cakes, and baking is conducted so as to obtain delicious burnt cheese products. Through the intermittent ultrasonic-assisted chopping technology, raw materials are heated, and then the heated materials are mixed, so that the juice isolation rate of products can be effectively reduced, the emulsifying effect can be guaranteed, and the elasticity and the fine and smooth degree of the products can be strengthened; through decompressed rapid freezing, the temperature of the products can be rapidly reduced, the flavor and the nutrient quality of the products can be maintained, and the shelf life can be prolonged; the frozenburnt cheese paste can be suitable for large-scale factory production, is stable in quality, rich in nutrition, tasty in mouth feel, convenient to use, and convenient to transport and sell; and the problems that loss caused by on-site making is large, the product yield is instable and the food hygiene and safety cannot be guaranteed are solved.

The invention provides an improved correlation matrix analysis method based on a structural hierarchical relation. The method comprises the following steps of: constructing the structural hierarchical information of a system; processing failures; processing tests; establishing an initial correlation matrix; judging correlation between an expansion failure and an expansion test in each structural hierarchy; and establishing an improved correlation matrix. The method can selectively comprise the following steps of: computing the failure detection rate of a specific structural hierarchical object; and computing the failure isolation rate of the specific structural hierarchical object. By the method, the conventional two-value correlation matrix is changed into a three-value correlation matrix, so a plurality of tests which are structurally uncorrelated with the failures can be eliminated, the quantity of the tests to be detected is reduced in the period of failure diagnosis, a large number of computation resources are saved, convenience is provided for quick failure diagnosis, and the computation of the failure detection rate and the failure isolation rate of any system hierarchical unit can be realized by the improved correlation matrix.

The invention discloses a candida selection medium for stool specimens and a preparation method of the candida selection medium. The candida selection medium for the tool specimens is characterized by comprising the following components in each 1000ml culture medium: malt extract 3-10g; beef heart for infusion 10-20g; magnesium sulfate 1.2-2g; agar 15-20g; gentamycin sulfate 0.005-0.02g; aniline blue 0.1-0.4g; calcium citrate tetrahydrate 0.01-0.2g; and water added to 1000ml. The preparation method comprises the following steps of: weighting the malt extract, beef heart for infusion, magnesium sulfate, agar, gentamycin sulfate, aniline blue, calcium citrate tetrahydrate, allithiamine, and glycocholic acid and dissolving the components into an orchis decoction; uniformly blending, drippingthe water until constant volume, and sterilizing the mixture and then sub-packaging the mixture. Compared with the prior art, the detection result of the candida from the stool specimens is reliable,and the isolation rate of the candida is high.

The invention discloses an epidemic propagation control method for implementing isolation by considering individual infection states and individual attributes. The invention discloses a sequential network epidemiological research method considering an individual state and intervention measures, and the method comprises the steps: firstly, initializing the activity and attraction attributes of nodes in a network; secondly, carrying out time sequence network structure evolution; then, selecting a passive isolation strategy and an isolation rate pi, and simulating an epidemic propagation processaccording to a time sequence network structure; then, counting the infection state node proportion of the network in a steady state; and finally, deducing a critical infection rate threshold [lambda]cof the epidemic disease under a random isolation measure and an isolation rate pi. According to the method, active isolation, passive isolation and other control measures are taken into considerationon the timing sequence network model conforming to the real situation, the critical infection rate threshold [lambda]c under the random isolation strategy is derived through the mean field approximation method, and a basis is provided for judging whether epidemic diseases can be spread in crowds or not and analyzing the efficiency of the isolation measures.

The invention belongs to the technical field of testability, and particularly discloses an inertial navigation system fault characteristic judging and testability predicting method. The judging methodincludes the steps: firstly, determining a multi-signal information model of testability; secondly, searching accessible test points of faults; thirdly, analyzing fault correlation, and determining fault-test correlation matrixes; finally, judging fault characteristics. The predicting method includes the steps: determining FDR (fault detection rate) and FIR (fault isolation rate) after determining of the fault-test correlation matrixes, and performing comprehensive and accurate testability predicting on system fault characteristics; analyzing the fault characteristics by the aid of the fault-test correlation matrixes, and analyzing single-fault characteristics and multi-fault characteristics. Accurate judging and testability predicting of the fault characteristics of the inertial navigation system are facilitated, fault analysis of the inertial navigation system is facilitated, and the maintenance workload of the inertial navigation system is reduced.

The invention provides a nicotine-decomposing microorganism selective medium and a preparation method thereof and relates to the technical field of microorganism cultivation. The nicotine-decomposing microorganism selective medium and the preparation method thereof give consideration to wide-adaptability and pertinence of formulas, improve the diversity of nicotine-decomposing microorganism selective sources, reduce unnecessary repeated selection, improve microorganism isolation rate of nicotine-decomposing microorganism rare species and enrich the demand resources of high-efficiency nicotine-decomposing microorganisms in the practical production and research field. The selective medium comprises 2g of beef extract, 1g of yeast powder, 3g of gellan gum, 0.5g of trehalose, 13g of K2HPO4, 4g of KH2PO4, 0.5g of (NK4)2SO4, 5g of NaCl, 0.5g of CaCl, 600 ml of sample environmental soil extract, 1g of nicotine, 18g of agar powder, wherein distilled water is added until the volume reaches1000 ml and natural pH is reached.

A controllable zero sequence current distribution network grounding fault isolating device disclosed by the present invention comprises a central station processor (6), a fault point indicator (3) electrically connected with the central station processor (6) and a signal source electrically connected with a bus (ABC). The input end of the central station processor (6) is electrically connected with a secondary side terminal (4) of a bus voltage sensor, and the output end is electrically connected with the control end of a three-phase synchronous operation switch (2) and a control signal terminal (7) of a pole-mounted switch. The signal source spans between a bus terminal (1) and a grounding terminal (8) after the three-phase synchronous operation switch (2) and an impedance grounding transformer (5) are connected in series, and is used to send out a control signal for removing a single-phase grounding fault branch when the bus voltage sensor monitors a single-phase grounding fault and after the central station processor (6) closes the three-phase synchronous operation switch (2) instantaneously. The controllable zero sequence current distribution network grounding fault isolating device has the very high fault point isolation rate, and can be widely used in the single-phase grounding fault isolation field in which a neutral point is not grounded with a power grid system directly.

The invention discloses a production method of an anti-ultraviolet fiber. In a slice polymerization process of spinning, a step of adding an ultraviolet isolation factor solution with bamboo charcoal as a carrier is also contained, and mass percent of the ultraviolet isolation factor with the bamboo charcoal as the carrier in fiber is 3-5%. According to the production method of the anti-ultraviolet fiber, porosity and adsorbability of the bamboo charcoal are utilized, and the bamboo charcoal becomes a carrier of the ultraviolet isolation factor and fluorine; the ultraviolet isolation factor has good anti-ultraviolet capability, and ultraviolet isolation rate is more than 95%; fluorine is doped, so that the ultraviolet isolation factor has oxygen vacancies on the surface, has visible light response catalytic activity and also has higher photocatalytic activity compared with a common ultraviolet isolation factor, and the bamboo charcoal as the carrier also has the function of adsorbing harmful substances, so that functionality of fiber fabric is effectively enhanced.

The invention relates to the field of iron and steel smelting, in particular to the field of slag pot isolation spraying coatings, and discloses a slag pot isolation spraying coating. The slag pot isolation spraying coating is prepared from, by mass, 85-92 parts of high bauxite clinker with the particle size smaller than or equal to 200 mesh, 3-10 parts of powdery graphite and 3-5 parts of portland cement. A preparing method includes the steps that the materials are prepared; the high bauxite clinker and the portland cement are stirred for 20 min to 40 min under the condition of 80 DEG C to 90 DEG C; the mixture is subjected to cold cutting to be at the room temperature, the graphite is added, the mixture is stirred to be even, and the slag pot isolation spraying coating is obtained. The invention further discloses an applying mode of the spraying coating. According to the slag pot isolation spraying coating, the preparing method and the applying mode, the pot isolation rate of slag pots can be 99% or above, persistent attachment hardly exists on slag pots, the damage rate of slag pots can be effectively reduced, the production efficiency can be improved, and the unnecessary production input can be reduced.

The invention discloses a method for calculating the testability index of a board-level circuit. According to the test information database and combined with the device information in the circuit, a dependency matrix Du independent of signal flow and position is constructed, and the highest fault detection rate is obtained by calculating the dependency matrix Du. Then the dependency matrix Du is reconstructed to obtain the reconstruction matrix, which realizes the isolation of devices in different positions in the same type of devices, and the highest fault isolation rate is calculated according to the reconstruction matrix, and the fault isolation rate of the current test selection is calculated according to the Boolean vector selected by the test. It can be seen that the present invention realizes the calculation of various testability indicators in the board-level circuit through the construction and reconstruction of the dependency matrix Du which is not related to the signal flow.

The invention discloses a method for determining the diagnosability of an angular rate measuring sensor of a satellite based on a correlation matrix. The method comprises the following steps of: (1) dividing functional modules of the angular rate measuring sensor, establishing a signal flow diagram of each module, and marking specified measuring points in the signal flow diagram; (2) performing failure mode and effect analysis (FMEA) on the angular rate measuring sensor, determining the failure mode, failure occurrence probability, failure severity and failure effects of the angular rate measuring sensor, and according to the failure effects, adding the failure mode into the signal flow diagram; (3) establishing a failure-measuring point correlation matrix; (4) assigning the failure-measuring point correlation matrix; (5) according to the failure-measuring point correlation matrix D which is established in the step (4), performing failure detectability analysis on the angular rate measuring sensor; (6) according to the failure-measuring point correlation matrix D which is established in the step (4), performing failure isolability analysis on the angular rate measuring sensor; and (7) determining the diagnosability of the angular rate measuring sensor, and measuring the diagnosability according to failure detection rate RD and failure isolation rate RI.

The invention discloses an N.braziliensis selective medium for a pleural effusion sample and belongs to the field of testing microculture. The N.braziliensis selective medium is characterized in that 1000ml N.braziliensis selective medium is prepared from beef liver powder, malt extract powder, yeast extract powder, sodium chloride, agar, iron lactate, calcium and zinc gluconate, nalidixic acid, argutone, asparagine and sterile de-fibering sheep blood by adding distilled water to 1000ml. Compared with the prior art, the N.braziliensis selective medium has the advantages of testing reliability and high N.braziliensis isolation rate.