35 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 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 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 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 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 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 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.