126 results about "Similarity theory" patented technology

The experiment platform includes experimental solid model of underground in 1:5 large scale, fire source system, ventilation and smoke extraction system, fire detection alarm system, experimental measurement and collection system, and data analytic system. Structure of multistory building of the solid model includes interzone tunnels, platforms, station halls and facility rooms etc. Modularized design is adopted. Fire source system can simulate different scenes of fire, and generate hot smoke gas of fire nigh true. Power and fuming quantity of the fire source system is determined based on theoretical analysis from model similitude. The experiment platform can generate growth curve of different power of fire. The experiment platform is in use for carrying out experimental studies: happening and growing mechanism of fire, and poison gas outspread inside stations of underground as well as control technique. The invention is applicable to different structures of station.

The invention relates to a test device and method for mechanical characteristics of a simulation bottom hole assembly, and belongs to the technical field of pipe string mechanical testing. The device comprises a simulation bottom hole assembly system, a driving system, a control system, a measuring system and a hoisting system, and is mainly composed of a test stand, a test bed, a hydraulic motor, a measuring and control instrument, a motor, an eddy current displacement sensor, a force measuring device, a computer, a signal acquisition module, a signal cable, a simulation drill string, a simulation wellbore, a wirerope and the like. The test method includes determining geometrical dimensions of the simulation drill string and the wellbore according to a similarity theory, subjecting the simulation drill string to stress calculation and designing the sensor according to a calculation result, hoisting the test bed to be at a needed hole drift angle through the hoisting system, loading an axial displacement and rotation speed to the simulation drill string through the driving system and the control system, and measuring axial force, lateral force and rotation angle of a simulation drill and a whirl motion law of the simulation drill string through the measuring system. According to the test device and method for the mechanical characteristics of the simulation bottom hole assembly, research quality of the mechanical characteristics of the simulation bottom hole assembly can be improved.

The invention discloses a fracture-cavity type carbonate oil reservoir three-dimensional physical model establishing method and relates to the technical field of three-dimensional modeling methods for computer mapping. The fracture-cavity type carbonate oil reservoir three-dimensional physical model establishing method mainly comprises the following steps of selecting a three-dimensional earthquake image corresponding to a target region according to three-dimensional earthquake test data and actual production situation, utilizing a Kriging interpolation method to reconstruct a three-dimensional numerical model through a three-dimensional earthquake cross section image, compiling an engraving program to manufacture a three-dimensional physical model and applying a similarity theory to arrange a well position according to the actual situation of an oil reservoir. By means of the fracture-cavity type carbonate oil reservoir three-dimensional physical model establishing method, the fully-three-dimensional large-sized physical model consistent to an actual underground structure and morphology of the oil reservoir and capable of representing fracture-cavity type carbonate oil reservoir complicated characteristics can be obtained.

A process planning method based on similarity theory comprises the following steps of: i) completing a part characteristic information model by adding a characteristic combination description on the basis of traditional single characteristic description, and building an description of part characteristics; ii) indicating entities formed by relevant information of relevant characteristic processing procedures regarding the characteristics as core by process elements, and generating a most basic module and a procedure characteristic of process planning; iii) building a case indexing structure based on the characteristics, generating similar process information by the similarity judgment of a part characteristic multi-branched tree, and performing the process similarity judgment; iv) performing procedure combinations by an agglomerative hierarchical clustering method, so as to generate a procedure cluster; and v) sequencing all the process elements in the procedure cluster according to the precedence relation, so as to ensure that all the process elements in the procedure cluster can be processed on a machine tool.

The invention provides a method for identifying production place of tea by using infrared spectrum technology, which comprises the following steps: production place typical lines of tea in place of origin are constructed; B. detecting sample: tea samples to be detected are taken and detected under the same condition with the standard sample respectively to obtain standard mid-infrared spectrums, average deviations between the tea samples and reference tea in production place are calculated according to the spectrums, and difference values between the average deviations and the production place typical lines are calculated, if the difference value is within standard deviation range, the tea sample belongs to the production place, otherwise, the tea sample does not belong to the production place. The method has the following advantages: 1. the analyzing result is not affected by subjective consciousness, thereby providing an impersonal evaluation criterion; 2. according to similarity theory, the average deviation can represent the difference between infrared spectrums of tea more accurately; 3. component separation, extraction and the like on tea are not needed before detecting infrared spectrum of the tea, which simplifies the operation, greatly improves the analyzing speed and reduces the detecting cost without environment pollution.

The invention relates to a component technology-based product modeling method. The method comprises the following steps that: S1, hierarchically decomposing a product: decomposing the product into a hierarchical structure of components and/or parts according to a functional module; S2, abstracting attribute information of the components and/or the parts: performing attribute decomposition on the components and/or the parts in the aspect of geometry and non-geometry; S3, classifying the components and/or the parts in the product according to a similarity principle; S4, defining the components:abstracting generality information according to a classification result in the step S3, and defining the components and/or the parts respectively; S5, establishing a component database and importing the defined components into the database; and S6, calling and instantiating the components. The method has the advantages that: the similarity of the components and/or the parts in the conventional product model is computed and classified according to a similarity theory; redefinition of the components is avoided; and types and data volume of the component definition are reduced.

The invention discloses a temperature and pressure controllable rotary erosion experiment apparatus which comprises a frequency control motor, an inner magnetic assembly, an industrial control computer, a pressure sensor, a temperature sensor, an electrochemical workstation, an upper liquid container, an outer magnetic assembly, a connecting rack, a support cover, a prefilming chamber, an observation window, a transmission center shaft, a lower liquid container, a circulating pump and a filter. The rotary erosion experiment apparatus can simulate working conditions of different temperatures, different pressures and the like in the industrial actual environment for erosion transient characteristic tests. By adopting a magnetic transmission system, the sealing effect of the experiment apparatus is ensured; the temperature, the pressure and the pH value can be simulated according to the industrial actual environment, therefore, erosion critical characteristics obtained in the tests do not need to be subject to similarity theory amendment; and an external by-pass circulating system is additionally arranged, thereby ensuring the balanced distribution of experiment medium temperature fields, and realizing that the working condition environment in the prefilming chamber is identical to the environment in the container. The invention can simulate cases of erosion failure existing in process type industries of petrochemical industry, coal chemical industry, seawater desalination and the like.

The invention relates to a simulation testing method for testing stress state and response of deep rock mass based on similarity theory. The method comprises the steps of: (1) initially calculating the stress and the explosion disturbance of the deep rock mass; (2) determining a similar scale C; (3) calculating analog quantities relative to a test piece based on the similar scale C; (4) applying a simulated static formation stress to the test piece; (5) carrying out excavation unloading disturbance testing to the test piece; and (6) carrying out explosion disturbance testing to the test piece. The simulation testing method has the beneficial effects that: the scientific phenomenon of the deep rock mass can be simulated and researched in a laboratory room, the similarity theory is used as theoretical basis, the scientific basis is strong, the method can simulate by steps through 'one high and twice disturbance' and is in accordance with the actual conditions, the whole simulation study process is clear and the operation is convenient.

The invention provides a processing method for wavelet analysis boundary based on the flow statistic and relates to a method used for solving of Hurst parameters based on the wavelet analysis and the invention is mainly used for solving the problem of exact solving of the Hurst parameters so as to detect the DDoS attack exactly. In the method, the Mallat algorithm is applied to carry out discrete wavelet decomposition, and flow statistic is done to signals of every grade in the process of multistage decomposition and the average flow is used as the extension signals; the signals waiting to be detected after the pretreatment are set to be S is equal to (S1, S2,..., Sn), and the signal length is n, and the S1, S2, ..., Sn are the statistic flows in the same specified time interval, and the length of a wavelet filter is Wlen, and the maximum decomposable level is that MaxLev is equal to (log 2 (n/Wlen-1) rounding in the lower). By using the method provided by the invention, the Hurst parameters can be calculated more exactly and the DDoS attack can be judged accurately in the DDoS attack based on the self-similarity theory.

The invention discloses a test system of fluid-solid coupling physical similarity simulation experiment for filling mining, which mainly comprises a similar simulation experiment frame, wherein coal and rock stratum similar simulation material, aquifer similar simulation material, water-proof key layer similar simulation material and filling body similar simulation material are laid in the similarsimulation experiment frame. The aquifer consists of a transparent flexible water tank filled with coarse and fine aggregates, one side of the aquifer is connected with a water source supply device to provide stable osmotic pressure for the aquifer utilizing a water pump, and the lower part of the water tank is provided with permeable combined hole devices with adjustable quantity and pore size;the water-proof key layer similar simulation material is mainly prepared from aggregate, an anti-permeability waterproof material and an auxiliary cementing material according to the required similarity ratio; and the filler similar simulation material is selected according to the stress-strain similarity theory. The test system of fluid-solid coupling physical similarity simulation experiment forfilling mining can realize the process of overburden deformation, fissure evolution and seepage and water inrush in the filling and mining under the fluid-solid coupling condition, and has the advantages of simplicity, strong operability, high simulation accuracy and the like.

The invention belongs to the subway tunnel experimental platform technical field and relates to a dynamic similarity-based subway tunnel model test bench and a test method thereof. The system includestunnel modules, driving modules, measuring modules and supporting modules; the plurality of tunnel modules are sequentially connected with one another and fixed on the supporting module; the drivingmodules are fixed on the supporting modules and are located inside the tunnel modules; and the measuring modules are installed on the outer walls of the tunnel modules. With the dynamic similarity-based subway tunnel model test bench and the test method thereof of the invention adopted, the requirements of the wind speed and wind pressure of piston wind on side walls can be satisfied; the speed ofa train at a designated position can be tested; parameter transformation can be carried out according to the changes of specific sites and environments, so that parameters can satisfy a similarity condition; on the basis of a dynamics similarity theory, a dynamic similarity model subway travel system is tested, so that the airflow characteristics and flow law of the prototype subway travel systemcan be predicted, and therefore, experimental costs can be reduced, and an experimental period can be shortened.

The invention provides a method for extracting the dimension characteristics of an underwater target based on space similarity. The method comprises the following steps of calculating the conventional beamforming space power spectrum of a distribution source based on ripple signals of the underwater target, utilizing point target space power spectra obtained by a space similarity theory and a classic theory to perform space similarity measurement, and finishing classification and recognition according to previously established space measurement threshold standards so as to extract the dimension characteristics of the underwater target. The method for extracting the dimension characteristics has the advantages that the influence of irradiation angles, base arrays and target distance parameters on the dimension characteristics is considered so as to conform with the visual recognition of the eyes to the dimensional target; three space similarity measurement methods are adopted in the process of extracting the dimension characteristics of the target, the defects of a single method are overcome, and the extracting and recognition reliability of the dimension characteristics of the underwater target is improved; and the conventional beamforming (CBF) method is used for calculating the space power spectrum of the distribution source target, and the space similarity calculation methods are relatively simpler and favorable to engineering realization.

The invention provides a method for calculating frozen soil model thermal parameters based on a similarity theory. The method comprises the steps: with use of specific heat and thermal conductivity coefficients of original soil at different negative temperatures, fitting to obtain a changing curve of the specific heat and thermal conductivity coefficients of the original soil along with the temperature, and calculating latent heat of the original soil with per unit volume; according to a geometric dimension shrinkage ratio of the prototype and a model, determining a geometric similarity constant Cl, namely a; if the density of the prototype soil is [rho]p and the density of the model soil is [rho]m, determining the soil density similarity constant C[rho], namely the ratio of the [rho]p tothe [rho]m; if the cold source temperature of the prototype is Tp and the cold source temperature of the model is Tm, determining the temperature similarity constant CT, namely the ratio of the Tp tothe Tm; and according to the determined similarity constant of the physical parameters, calculating to obtain the thermal parameters of frozen soil. The method has the effects that the calculation method makes up calculation of the thermal parameters of the model soil in the frozen soil temperature field model test, the calculation error is less than 0.1 DEG C, the accuracy satisfies the application of thermal value in actual engineering, and thus the accuracy of the model test results is ensured.

The invention provides a spiral bevel gear tooth root bending stress testing method in consideration with dynamic load based on similarity theory. The method comprises the steps of: (1) selecting main parameters in a spiral bevel gear dynamic load similarity model; (2) determining similarity criteria in the dynamic load similarity model by using the similarity theory; (3) selecting main parameters in a spiral bevel gear tooth root bending stress similarity model; (4) determining similarity criteria in the tooth root bending stress similarity model by using the similarity theory; (5) designing gear parameters and test input parameters of the spiral bevel gear tooth root bending stress similarity model in consideration with dynamic load by combining the dynamic load similarity model with the tooth root bending stress similarity model; and (6) designing a test scheme, constructing a test bed, performing tooth root bending stress test, and acquiring tooth root bending stress in a prototype according to a similarity ratio. The method can lower the tooth root bending stress test condition.

The invention discloses a black-start scheme evaluation method, which comprises the steps of asking L experts to give a ranking vector for all evaluation indexes used for black-start scheme evaluation and figuring out a subjective based on the weight ordered binary comparison method; figuring out an objective weight based on the method of variation coefficient, according to an initial decision matrix formed by the values of all evaluation indexes; figuring out a comprehensive weight based on the vector similarity theory; converting the initial decision matrix in the form of real values into a decision matrix in the form of a Vague set, and converting a weight vector into a vector in the same form with the obtained decision matrix; and ranking all schemes based on the PROMTTHEE method of the Vague set to obtain a ranking sequence. According to the technical scheme of the invention, the objective difference of data and the subjective preference of experts are well combined, and then a more reasonable index weight is given. Meanwhile, the priority relationship of quantization schemes can be quantized more accurately based on the PROMTTHEE method, so that the schemes can be completely ranked.

The invention discloses a multi-feature-based gray uneven image fast segmentation method. Similarity theory fast estimation bias field information is introduced, which simplifies a local information model. The running speed is greatly improved. The sensitivity to initialization contour information is reduced. Compared with a classical algorithm, the method has the advantages that a Heaviside function similar to a step function is constructed; a segmentation curve is more smooth; a dual termination condition is introduced; and according to different self-adaptive end curve evolution processes of an image content, the speed of a segmentation algorithm is improved.

The invention provides a design method of a scaling model machine based on the combustion engine similarity theory of diesel engines. The method comprises following steps: constructing a model machinecorresponding to a prototype, the model machine and the prototype have any one or any of the following relationships: geometric similarity; boundary condition similarity; media condition identity; the dimensionless piston speed remains equal at the corresponding crank angle; oil injection rules are the same; eddy current ratios are the same; delay periods are the same; influences caused by heat transfer loss are the same. The invention also provides a scaling model diesel engine made according to the above-mentioned design method of scaling model machine based on diesel combustion similaritytheory. The invention can utilize the reduced scaling model machine to reproduce the spray combustion and emission characteristics of the target prototype and map back to the prototype, thereby reducing the cost of the development process of the large diesel engine parts and the optimization process of the whole machine. At the same time, it has guiding significance for the intensive development of different cylinder diesel engine products.

The invention relates to a supercritical CO2 continuous drilling fluid simulated circulation test device. The test device comprises the structure of the conventional drilling fluid simulated circulation test device, and uses supercritical CO2 as oilfield drilling fluid. A drilling shaft designed according to the similarity theory is applicable to a vertical shaft and a horizontal well and does not pollute an oil layer, particularly a nozzle arranged at the lower port of a continuous pipe has good abrasion resistance, and the test device can meet on-line monitoring of pressure and temperature of the nozzle.

The invention provides a hydraulic brake cylinder pressure estimation method and a hydraulic brake cylinder pressure estimation device on the basis of an electromechanical similarity theory. The hydraulic brake cylinder pressure estimation method includes: simulating an automobile hydraulic brake system cylinder model by an electric device, wherein the simulated automobile hydraulic brake system cylinder model is formed by similar conversion of a hydraulic brake mechanical system and a flow characteristic via electromechanical similarity relation; selecting a brake condition and simulating an electromagnetic valve control instruction to drive the hydraulic brake system cylinder model via electric semaphore; measuring electric parameters of the hydraulic brake system cylinder model controlled by the control instruction; obtaining cylinder pressure of the hydraulic brake mechanical system via the electromechanical similarity relation according to the measured electric parameters. The hydraulic brake cylinder pressure estimation method and the hydraulic brake cylinder pressure estimation device on the basis of the electromechanical similarity theory have the advantages that complex processes in establishing dynamic and energy equations and building a specific hydraulic adjusting system experiment bench are omitted, a theoretical model is established by a relative simple circuit, control precision is improved, a developing period is shortened, and production cost is reduced.

The invention discloses a network timely reliability accelerated test method based on an M/M/s queuing model. The method includes the following steps that (1) components of a queuing model are obtained according to a delayed fault mechanism of a communication network queuing model, and service intensity requirements are determined; (2) a network timely reliability model is obtained; (3) a reliability accelerated model is obtained on the basis of a similarity theory; and (4) a network timely reliability accelerated test is performed. According to the network timely reliability accelerated test method based on the M/M/s queuing model, problems that current network reliability tests are overlong in test time, extremely high in costs or insufficient in quantity of short time test samples and low in confidence coefficient can be effectively solved, and thereby the test efficiency is improved.

The invention relates to a starting modeling method of a gas turbine engine, which relates to the technical field of modeling and simulation of the gas turbine engine. The invention provides a starting modeling method of a gas turbine engine based on a similarity theory. The method comprises the following steps: a calculation method of a high-rotation acceleration, a high-rotation speed, a low-rotation speed and a high-pressure compressor outlet pressure based on the similarity theory; and a method for calculating the turbine interstage temperature according to the aerothermodynamic process ofthe core engine using the above calculation results. This method can simulate the main parameters of engine starting process with high precision, and only based on engine test data to establish engine starting model. It has the advantages of simple method, small calculation amount, low requirement for modeling prerequisite conditions, and the model accuracy can meet the needs of engineering application.

The invention discloses an estuary dam geometrical morphology measuring method. The method includes the following steps that firstly, a prototype geologic model is determined according to measuring region geological data, a physical model is established according to the similarity theory of sedimentary physical simulation, an experimental scheme is designed accordingly, an experiment is carried out on the basis of the experimental scheme and the sedimentation process is controlled; secondly, the sedimentation result is researched through a section cutting method, the position of an estuary dam is determined, length and width data of the estuary dam and the extended distance of the lake shoreline are measured, a planar distribution diagram of the estuary dam is drawn, and thickness data of the estuary dam are measured in combination with the section; thirdly, linear correlation analysis is conducted on the obtained length-thickness and length-width data of the estuary dam; fourthly, modern sedimentation estuary dam length and width data measured on the basis of satellite photos are obtained, statistical analysis is conducted on the modern sedimentation estuary dam length and width data, and a research area estuary dam length-width empirical formula is established by synthesizing water tank simulation and modern sedimentation measuring results. The method has the advantage of being capable of guiding exquisite configuration anatomy of a work area estuary dam and can be widely applied to the technical field of reservoir description.

The invention discloses a method for designing a ground equivalent experiment for space motion of a spacecraft. The method comprises the following steps of firstly, parameterizing the space motion; then, providing a space prototype and a ground experiment model by utilizing a dimension analysis method, and obtaining a mapping relationship of each motion parameter between the prototype and the model by utilizing a similarity theory; finally, mapping tasks in the space to a ground microgravity experiment environment according to completely similar requirements by utilizing the mapping relationship. According to the method disclosed by the invention, ground equivalent experiment design on the space motion can be carried out under a microgravity environment, the actual effect of the space motion can be reflected, and lots of problems possibly occurring in the space motion can be solved.

The invention discloses a doubly-fed wind motor dynamic equivalence method based on similarity homology. The method comprises the following steps of stepS10, using a prony algorithm to fit the outputpower of doubly-fed wind motors to the linear combination of the exponential functions of an amplitude, a phase, a frequency and damping; stepS20, according to the linear combination acquired from thestepS10, using a similarity theory to determine a similar oscillation mode between the doubly-fed wind motors; stepS30, using the similar oscillation mode to define a homology similarity quantification index between the doubly-fed wind motors, and discriminating a homology cluster in a wind power plant; S40, taking active power output by the doubly-fed wind motors as weight and acquiring the equivalent transient internal potential of an equivalent machine, and connecting the equivalent transient internal potential buses of the doubly-fed wind motors of a same group to the equivalent transient internal potential bus of the equivalent machine through a complex transformation ratio phase shifting transformer respectively; and stepS50, calculating the equivalent parameter of each equivalentmachine, and connecting the equivalent transient internal potential bus of the equivalent machine to the equivalent machine through an equivalent doubly-fed wind motor impedance.