71 results about "Nondimensionalization" patented technology

The invention relates to a method for measuring a diffusion coefficient of carbon dioxide in a saturated oil core. The method comprises the following steps of: performing nondimensionalization by using a convection-diffusion mathematical model, and performing numerical solution, wherein the diffusion coefficient Deff of the carbon dioxide in the saturated oil core is finally obtained by using the method and required to be used in the numerical solution process; and continuously correcting the value of D'eff, and repeatedly executing the step (13), so a curve c of delta Co and t<1 / 2> is completely coincided with a curve b of delta PTh and the t<1 / 2>, wherein the D'eff is the Deff and represents the diffusion coefficient of the carbon dioxide in the saturated oil core. The method has the advantages that the influence of the volumetric expansion of crude oil caused by dissolution of the carbon dioxide in the crude oil on the diffusion process and the influence of a porous medium on the diffusion process are taken into consideration, and the obtained effective diffusion coefficient of the carbon dioxide in the saturated oil core can accurately reflect the true diffusion process.

The invention provides a large mechanical equipment structure dynamic similarity test method, comprising the steps as follows: (1) a basic similarity theorem is adopted, all physical quantities are listed, geometrical quantity, density and elastic modulus are determined as basic physical quantities, and the similarity theorem is written into a dimensionless equation expressed by the basic physical quantity; (2) according to concerned basic physical principle, the similarity ratio of all physical quantities adopts similar relation expression, and the similar relation expression is modified according to a structure elastic vibration similarity equation; (3) similar model material is selected, density similarity ratio and elastic modulus similarity ratio are determined, geometrical quantity similarity ratio is determined, and the similar model design is then completed; (4) a structure dynamic test of the similar model is carried out so as to obtain the dynamic characteristic number which is substituted into the similarity relation expression so as to work out the dynamic characteristic data of the original model which is also the natural vibration frequency. The large mechanical equipment structure dynamic similarity test method realizes the conversion of ultra-large structure dynamic natural frequency with small model, effectively reduces the scales of dynamic test objects, simplifies the test instruments, and reduces the test cost.

The invention discloses a method for evaluating compressibility of a tight reservoir based on a stress-strain curve. The method comprises the following steps: testing the stress-strain curve of a rocksample under a certain confining pressure to obtain elasticity modulus and Poisson's ratio of an elastic deformation stage so as to obtain the volumetric strain of the elastic deformation stage and obtain crack volume strain; determining an expansion point of the rock sample according to an axial strain-crack volume strain relationship curve and obtaining the strain energy size through the stress-strain curve envelope area formed from the expansion point to the break point in an enclosing way; and establishing a compressibility index mathematical model of the surrounding rock by performing nondimensionalization on the change numerical value of the parameter, and calculating and comparing the size. The experimental evaluation method provided by the invention is suitable for the unconventional resources such as shale gas, coal bed gas, compact oil gas and a hot dry rock, and can be applied to the conventional oil and gas reservoir with low permeability and ultralow permeability. The confining pressure effect is considered and the artificial fracture density formed after the rock is expanded is considered, so the method can be used for evaluating the artificial joint network formingcapability of the formation condition and guiding the volumetric fracturing construction to select wells and select formations.

The present invention discloses a method for evaluating an airport terminal area usage rate based on multiple hierarchy state classifying. The method includes the following steps: (1) establishing an airport terminal area usage rate evaluating index system from three different dimensions of space, time and capacity; (2) preprocessing the indexes to achieve nondimensionalization and uniformization of the indexes; and (3) selecting a method combining an analytic hierarchy process and a state classifying evaluating process to evaluate usage conditions of the airport terminal area, first using the analytic hierarchy process to determine weight of influence of each index, and then using the state classifying evaluating process to determine the usage degree of the airport terminal area. The method of the present invention constitutes a multiple hierarchy airport terminal area usage rate evaluating index system, which completely reflects the usage rate of the airport terminal area from the comprehensive dimensions of space, time and capacity, achieves an effective combination of qualitative and quantitative methods, and has an important role of guiding in promoting the sufficient and reasonable usage of airspace and increasing the manage level of the airspace.

The invention relates to a wind power plant comprehensive evaluation method, in particular to a wind power plant comprehensive evaluation method based on an analytic hierarchy process and a comprehensive distance evaluation method. The wind power plant comprehensive evaluation method includes the following steps that firstly, wind power plant running evaluation indexes are selected; secondly, an evaluation matrix is subjected to index same-direction treatment and nondimensionalization treatment to acquire a standard evaluation matrix; thirdly, an evaluation matrix and index weight vectors are determined based on the analytic hierarchy process; fourthly, the relative proximity corresponding to each wind power plant is worked out according to the comprehensive distance evaluation method, and comprehensive evaluation on wind power plant running conditions is carried out through sorting of the relative proximities. By means of the method, safety running conditions of the wind power plants are fully and objectively evaluated, and evaluation evidence is provided for electric power departments in comprehensive comparison of wind power plant running conditions.

Disclosed is a structural dynamic design method for a high-pressure rotor of an aircraft engine. The relationship between high-pressure rotor model design parameters and rotor vibration characteristics is determined, so that the design method and criterions are provided for dynamic design of the high-pressure rotor, and the method is of great guiding significance to the design of the high-pressure rotor of the aircraft engine. The method includes: establishing a dynamic model and a dynamic equation of the high-pressure rotor to obtain a nondimensionalization characteristic equation; introducing an equivalent critical speed, and determining a two-order critical speed range of a high-pressure rotor system according to the equivalent critical speed; changing a conventional equilibrium amount configuration method by configuring residual disequilibrium amount phases; configuring a ratio of rotor pole rotation inertia to mass center rotation inertia in design according to a specific design objective; establishing configuration criterions for a rotor bearing stiffness ratio. A conventional design process is changed, structural dynamic active design of the high-pressure rotor is realized, the design process is optimized beneficially, design cycle is shortened, and the method has important construction value.

The invention provides a method and device for optimizing vibration isolation parameters of a magneto-rheological vibration isolator in a floating slab track. The method comprises the steps of conducting nondimensionalization analysis on a vibration isolation equation and a performance index equation of a vibration isolation model built by a floating slab, the magneto-rheological vibration isolator and a foundation, obtaining optimum nondimensionalization vibration isolation parameters of the magneto-rheological vibration isolator, and converting the optimum nondimensionalization vibration isolation parameters into optimum dimensional vibration isolation parameters. By the adoption of the method and device for optimizing the vibration isolation parameters of the magneto-rheological vibration isolator in the floating slab track, the optimum vibration isolation parameters, meeting performance indexes, of the magneto-rheological vibration isolator can be obtained.

The invention discloses a rail passenger flow congestion risk evaluation method based on an entropy weight. The method comprises: acquiring monitoring values of two characteristic indexes, namely an in-out station passenger flow volume and a load factor, of a rail station section at different durations; respectively nondimensionalizing a forward index and a reverse index by utilizing different membership functions, uniformly transforming an evaluation value of each index to be a quantified numeric value in a range [0, 1], and eliminating nondimensionalization influence; calibrating model parameters by taking maximum values of the indexes within the statistic time as input values of a model; and calculating weights of different evaluation indexes in the model according to an entropy weight method, clustering risk evaluation, and partitioning grades of rail passenger network passenger flow congestion five-stage risk. The method provided by the invention constructs a rail passenger network operation passenger flow congestion risk evaluation model and quantitatively evaluates the whole rail passenger network operation passenger flow congestion risk based on the in-out station passenger flow volume and the load factor of the rail station section.

The present invention relates to a method for calculating the power grid operation evaluation index dimensionless. The method comprises the following steps of 1) inputting the current data of an index from a power grid real-time database and inputting the historical data of the index from a power grid historical database to form an information database; 2) setting the interval number of the index and the index threshold values corresponding to the upper and lower limits of each interval; 3) analyzing the historical data of the index and counting the number of the historical data of the index within different intervals; 4) positioning the position of the current data of the index in a histogram by a historical distribution histogram of the index and the current data value of the index, and separately calculating the out-interval ranking rate and the in-interval ranking rate of the index to obtain the current ranking rate of the index; 5) setting the index scores corresponding to the upper and lower limit threshold values of the different intervals of the index, considering the distinction of a maximum index and a minimum index, and calculating the offset amount of the current ranking of the index. The calculation method of the present invention is simple in flow, small in computation amount and development difficulty and strong in practicality, and the definition of an intermediate result during the calculation process is clear.

The invention provides a novel urban public transportation system improvement method. All indexes of the urban public transportation development level are determined, the index value of each index is worked out, and the index values are subjected to identit conversion and nondimensionalization treatment; whether the index value of any index is smaller than a preset threshold value or not is judged, if yes, a facility corresponding to the index is improved so as to make the index value of the index of the facility equals the preset threshold value at least, and otherwise it is considered that the facilities corresponding to the indexes meet requirements of citizens and do not need to be improved. According to the technical scheme, statistics and calculation of all the indexes of the current situations of an urban public transportation system are carried out first, nondimensionalization treatment is carried out through the efficiency coefficient method, a uniform evaluation mechanism is provided for the prior public traffic facilities, scientific evidence are provided for the requirements of the citizens for the public traffic facilities, detailed improvement plans are provided according to evaluation results and the requirements of the citizens, and effective evidence is provided for optimization, improvement and planning of the urban public traffic system.

The embodiment of the invention discloses a voltage transformer winding working state detection method and system. A present vibration frequency response curve of each measuring point can be accurately obtained through carrying out frequency sweep exciting tests on a voltage transformer winding, and can be converted into a mode of matrix; data of all the frequency points is taken into consideration so as to raise the precision of detection; and minimal deformation of the voltage transformer winding can be reflected in the present vibration frequency response curve, so that very high sensitivity is gained; and normalization processing is further carried out on the vibration frequency response matrix to realize data nondimensionalization and raise the calculating efficiency; then eigenvalue decomposition is carried out on a covariance matrix obtained through calculating of historical vibration frequency response curve matrixes to determine the number of principal components; principal component decomposition is carried out on the covariance matrix; afterwards, transformation is carried out on the present vibration frequency response curve matrix by column according to the matrix obtained through decomposition; and finally, through calculating a mean value and a control limit of statistics, whether abnormities such as deformation occur to the voltage transformer winding is determined quantitatively, thereby realizing extremely high precision.

The invention relates to a method for quantitatively forecasting analog development indexes of oil and gas fields. The method comprises the following steps that 1), an oil pool three-dimensional seepage mathematic model is built according to a motion equation, a matter balance equation, a saturability auxiliary equation, initial conditions and boundary conditions of an oil pool; 2), nondimensionalization is carried out on the oil pool three-dimensional seepage mathematic model to obtain the nondimensionalization mode of the oil pool three-dimensional seepage mathematic model; 3), the oil pool three-dimensional seepage similarity criterions are obtained according to the equation structure and similarity theory analysis of the nondimensionalization mode of the oil pool three-dimensional seepage mathematic model and are simplified into pi I and pi II; 4), whether the oil and gas fields to be developed and the developed oil and gas fields meet the similarity criterions pi I and pi II or not is judged; 5), for the oil and gas fields meet the similarity criterions pi I and pi II, to-be-developed productivity Q and to-be-developed recovery efficiency R of the developed oil and gas fields are forecasted according to developed productivity Q and developed recovery efficiency R of the developed oil and gas fields by using a forecast formula; 6), the quantitative forecast result of to-be-developed productivity Q and to-be-developed recovery efficiency R of the oil and gas fields to be developed in the development indexes can be obtained through calculation.

The invention discloses an analysis method for a polymer flooding large pore path oil deposit test well. The method is characterized in comprising the following steps that: 1) according to the characteristics of a polymer flooding large pore path oil deposit, establishing a polymer flooding large pore path oil deposit physical model; 2) according to the polymer flooding large pore path oil deposit physical model obtained in 1), determining a polymer flooding large pore path oil deposit mathematical model; 3) adopting a finite difference method to solve the polymer flooding large pore path oil deposit mathematical model obtained in 2), and obtaining the numerical solution of well bottom pressure; 4) carrying out nondimensionalization on a change relationship of pressure along with time, and drawing the typical curve theory plate of the polymer flooding large pore path oil deposit; and 5) carrying out fitting on the typical curve theory plate of the polymer flooding large pore path oil deposit and an oil field actual measurement data curve, and obtaining the equivalent width and permeability parameter of a large pore path.

The invention relates to the field of ecological protection, and in particular relates to a computer modeling method of green development ecological safety evaluation index in a biodiversity protection priority area. The method comprises the following steps of: (1) selecting indexes; (2) carrying out nondimensionalization on the indexes; (3) carrying out analytic hierarchy process; and (4) computing the comprehensive safety index.

The invention belongs to the technical field of petroleum and natural gas industries, and discloses a method for calculating pipeline buckling strain and critical fault displacement under faulting. The method comprises the following steps of: extracting a calculation result through finite element simulation and data analysis; carrying out dimensionless processing on parameters such as a wall thickness, a burial depth, an intersection angle between a pipeline and a fault surface, pipeline internal pressure, a soil compression modulus, soil cohesive force and critical fault displacement by combining a law of influences, on pipeline critical axial strain, of the parameters; and obtaining a critical compression strain regression formula and a critical fault displacement regression formula through multi-element linear regression analysis. According to the method, design strains of pipelines passing through fault areas X80 can be obtained through formula calculation and safety factors, theoretical support and a certain reference value are provided for the strain design standard-based establishment of the pipelines passing through the fault areas, and important reference basis and theoretical support are provided for the design, post-earthquake maintenance and safety analysis of fault buried heavy-caliber gas pipelines.

The invention relates to a grey clustering analysis method, comprising the steps of: (1) providing a clustering albetion function: selecting n clustering objects to obtain m clustering indexes and construct an n*m table; (2) inputting the clustering albetion function into a computer and getting into the algorithm of grey clustering analysis and evaluation, comprising: performing equalization nondimensionalization treatment to the clustering albetion; determining the grey type of each clustering index value of each clustering object; calculating the albetion weight function value of each grey type by an estimation method or interpolation method; demarcating a clustering weight grey matrix; and constructing a clustering matrix; and (3) performing grey evaluation according to the result of step (2). The method overcomes the defect of great influence caused by individual factor in single factor evaluation, reflects the influence of the evaluation factors in an all-round way, and has objective evaluation result, convenient and rapid calculation, accurate result, wide applicability, precise evaluation and high sensitivity.

The invention discloses a high-frequency transformer winding loss semi-empirical calculation method considering an end effect. The method comprises the steps of screening a decisive influence factor of an alternating-current resistance coefficient according to a geometric structure of a transformer; combining the decisive influence factors of the alternating current resistance coefficients, carrying out dimensionless processing, and determining a reasonable change interval of each dimensionless parameter; establishing a parameterized finite element simulation model of the high-frequency transformer, and calculating alternating-current resistance coefficients under the condition of different dimension parameter combinations; and selecting a fitting function, performing multivariable regression analysis, and calculating a correction coefficient to obtain a semi-empirical formula. The method is suitable for winding loss calculation of narrow foils and circular conductors under different filling rates and arrangement modes, the calculation amount and the calculation time required by optimization design are reduced, convenience and rapidness are achieved, and engineering application isfacilitated.

A construction method of a house cost performance evaluation model comprises the following steps: 1) collecting corresponding index sets of the house cost performance evaluation model, wherein the corresponding index sets comprise a house dwelling effective index set A and a house dwelling cost index set B, and the house dwelling effective index set A comprises a house type performance evaluation index set, a building group performance evaluation index set and a location impact evaluation index set; 2) performing nondimensionalization on the house dwelling effective index set A; respectively performing weight totaling and combining on the house dwelling cost index set B and the house dwelling effective index set A after nondimensionalization to obtain values of the house dwelling cost index set B and the house dwelling effective index set A, which are subjected to weight totaling and combining; 3) constructing the house cost performance evaluation model according to the values of the house dwelling cost index set B and the house dwelling effective index set A, which are subjected to weight totaling and combining. The house cost performance can be evaluated objectively and scientifically.

The invention discloses a big power grid construction economical type assessment method, comprising steps of establishing an evaluation index system, calculating an index value according to the evaluation index system, wherein the evaluation index system comprises a peak shifting benefit, a mutual aid benefit, a backup benefit, a power supply benefit, an industry benefit, an environment benefit, an operation benefit, a production value benefit and a city benefit, choosing a folding line nondimensionalization mode to perform standardization processing on the evaluation indexes, adopting an addition integration method and a multiplication integration method to perform comprehensive empowerment on various standardized indexes, and establishing a comprehensive model to obtain a comprehensive scores, The invention can guide the electric power enterprise to establish investment benefit philosophy, promotes optimization design scheme and construction scale and is applicable to the big power grid construction economic evaluation research.

The invention discloses a debris flow equilibrium slope calculation method and an application thereof, belonging to the technical field of debris flow control works. The method comprises the following steps: measuring the yield stress tau with unit pa through field investigation; determining the debris flow volume weight p with unit kg / m<3> through an outdoor volume weight test, and measuring the debris flow depth h with unit m through field investigation; substituting the yield stress tau, the debris flow volume weight p and the debris flow depth h in the step (a) into a formula tau<*>=tau / pgh to determine the yield stress tau<*> of nondimensionalization; substituting the yield stress tau<*> of nondimensionalization obtained in the step (b) into a formula S=3.0887tau<*1.3724> to determine the slope S of nondimensionalization; and finally, substituting the slope S of nondimensionalization obtained in the step (c) into a formula S=tana to obtain the equilibrium slope. In the invention, the size effect is eliminated through nondimensionalization, the deduction into actual debris flow is facilitated, a theoretical basis is provided for the design of debris flow disaster control works, and the disaster prevention applicability is improved.

The invention discloses a method for optimally designing non-probabilistic reliability shapes of trusses. The method includes steps of firstly, determining design variables of the to-be-optimized trusses; secondly, determining structure capability functions; thirdly, acquiring non-probabilistic reliability index functions eta (X, A, P) corresponding to the structure capability functions g (X, A, P); fourthly, carrying out non-dimension processing on the design variables; fifthly, building truss non-probabilistic reliability shape optimization models; sixthly, solving the truss non-probabilistic reliability shape optimization models. The method has the advantages that rod coordinates and the sectional areas of rod pieces are used as the design variables, the non-dimension unified processing is carried out on the design variables, Tailor's approximation is carried out on the capability functions at interval midpoints instead of the traditional design points, the interval midpointsare found out in advance, and accordingly the shortcomings of the traditional reliability constraint optimization iteration procedures can be overcome by the aid of the method; the traditional nestedtwo-level optimization models are converted into a single-level model, accordingly, the problem of difficulty in convergence by the aid of optimization algorithms due to wide coupling and variation ranges of different types of variables can be solved by the aid of the method, and the reliability shapes of truss structures can be optimized by the aid of the method.

The invention discloses a method for evaluating efficiency of subway transfer station facilities. The method comprises the steps that information of a transfer station is acquired for collecting planelayout data of the subway transfer station to obtain transfer lines of the transfer station among different subway lines; efficiency evaluation indexes of the transfer station facilities are calculated, and index calculation values are obtained according to various index computational formulas; nondimensionalization is carried out on the evaluation indexes, wherein nondimensionalization processing is carried out on various indexes to obtain evaluation values within a same interval so that impacts caused by different index units and different order of magnitudes are eliminated; comprehensive evaluation is carried out on the efficiency of the transfer station facilities, the evaluation index weight is adopted to calculate a comprehensive evaluation value, thereby judging the efficiency of the transfer station facilities and giving reference suggestions. According to the method for evaluating the efficiency of the subway transfer station facilities, a set of systematized, quantitative and convenient computational method for evaluating the efficiency of the subway transfer station facilities is provided, and the method is applied to the facility efficiency evaluation of all subway transfer stations.

The embodiment of the invention discloses a voltage transformer winding state detection method and an apparatus thereof. A present vibration frequency response curve of each measuring point can be accurately obtained through carrying out frequency sweep exciting tests on a voltage transformer winding, and converted into a mode of matrix; data of all the frequency points is taken into consideration so as to raise the precision of detection; and minimal deformation of the voltage transformer winding can be reflected in the present vibration frequency response curve, so that very high sensitivity is gained; normalization processing is further carried out on the vibration frequency response matrix to realize data nondimensionalization and raise the calculating efficiency; then a historical vibration frequency response matrix is decomposed into a non-negative matrix with a certain degree of sparseness; the proportion of basis vectors in overall data is raised, so that prominent features are represented by vectors of extremely few dimensions; and finally, through calculating a mean value and a control limit of statistics, whether abnormities such as deformation occurs to the voltage transformer winding is determined quantitatively, thereby realizing extremely high precision.

The invention discloses an optimal layout method of urban waterlogging monitoring points. The method comprises the following steps: acquiring urban waterlogging points, and constructing a decision matrix for the urban waterlogging points; performing dimensionless processing on a magnitude of the decision matrix; determining a solution result of the dimensionless processing, and determining ideal solutions and negative ideal solutions; further determining the Euclidean distance of the ideal solutions, the Euclidean distance of the negative ideal solutions, the grey relational degree between the ideal solutions and the grey relational degree between the negative ideal solutions, and then calculating multidimensional synthetic applicabilities; sorting the multidimensional synthetic applicabilities of each urban waterlogging point by size, and the urban waterlogging point with the maximum multidimensional synthetic applicability is an optimal urban waterlogging monitoring point. The method of the invention can meet the actual requirement of urban waterlogging monitoring, provide basic data for a waterlogging monitoring system of an urban drainage network, is conducive to play the effective performance, and can quickly and accurately handle the waterlogging problem.

The invention discloses a dimension reduction clustering data analysis method. The method comprises the following steps of: S101, generating sample data, carrying out a dimensionless method for the sample data and constructing projection data needed by a model; S102, constructing a projection index and obtaining an optimal projection direction vector as shown in the specification; and S103, carrying out linear projection on the projection data to obtain a one-dimensional projection characteristic value. Through the abovementioned steps, a projection pursuit technology and a dynamic clustering method can be combined and are applied to a high-dimensional data dimension reduction clustering model, the operation is simple and the model objectivity is also improved; for the possible situation of decision-maker preference, constraint conditions are increased so that the model can comprehensively consider objective weights and the decision-maker preference and the application range of the model is widened.

The invention discloses a marine ship oil spill accident emergency resource allocation method based on multi-objective fuzzy programming. The method includes the steps that 1, uncertain sailing duration and resource demand quantity are represented as the triangle fuzzy number, determination representation is conducted on fuzzy emergency starting time through the complete integral of a time membership degree function, demand quantity membership degree is used to represent the demand satisfaction degree of the resource amount received by oil spill points, and thus the timeliness and the demand satisfaction degree objective function of the emergency system are set; 2, the maximum of the total sailing safety index of rescue ships serves as the safety objective, and the minimum of the sum of the rescue ships serves as economy sub objectives; 3, nondimensionalization is conducted on all the sub objectives, and a multi-objective planning model is built with the timeliness of the system, the demand satisfaction degree, safety and economy as the optimal objective through a liner weighting method. By means of the marine ship oil spill accident emergency resource allocation method based on multi-objective fuzzy programming, the nondeterminacy of the sailing duration of the rescue ships and the resource demand quantity of the oil spill points can be processed effectively.

The present invention discloses an experiment method for evaluation of fluid capacity for rock fracture forming. The method comprises the following steps of: testing brittleness coefficients, wave velocity-stress sensitivity coefficients, sound emission event numbers and natural fracture densities of a drying rock and a wet rock, performing nondimensionalization of the relative change values of the parameters, establishing fracture forming capacity index mathematic model of the different fluids for the rock, performing calculation and performing comparison. The experiment method for evaluationof fluid capacity for rock fracture forming is suitable for unconventional resources such as shale gas, coal bed gas, compact oil gas and hot dry rock, can be applied to the conventional oil-gas reservoir with low permeability and ultra-low permeability, can rapidly obtain the fracture forming capacity index of the different fluids for the rock, can evaluate the fracture forming capacity index ofthe same fluid for different rock samples and can conveniently guide hydraulic fracturing construction to optimize fracturing fluid to promote the formation of the manual complex fracture net in thefracturing process.

The invention belongs to the motion control field and especially discloses a point location motion S curve generation method. The method comprises the following steps of S1, fitting a S curve position-time relation into a 5 power polynomial function through nondimensionalization, and carrying out differential on a position-time function so as to acquire a speed-time function; carrying out differential on the speed-time function so as to acquire an accelerated speed-time function; S2, requiring to satisfy a condition 1 and a condition 2 and acquire 6 function coefficients through the condition 1 and the condition 2; and S3, through a conversion relation between a dimensionless value and a real value, calculating a function of a real value position relative to time and calculating a function of a real value speed relative to the time. In the invention, the S curve generation method is simple, a speed function is a 4 power function and an accelerated speed is a 3 power function, which shows that the curve is smooth and soft; for a set value, accelerated and decelerated distances can be converted into accelerated and decelerated time, and in an occasion which is strict to the accelerated and decelerated distances, accurate accelerated and decelerated distance control is acquired.

The invention relates to a dynamic evaluation method of water resources benefit based on variable fuzzy decision theory, which comprises the following steps: step 1, constructing a dynamic evaluationmodel of water resources benefit; 2, carrying out dimensionless processing on the index value in the step 1; 3, determining the weight vector of the qualitative index and the quantitative index; 4, evaluating the comprehensive benefits of water resources by using the variable fuzzy decision theory, and obtaining the relative membership degree of each scheme; The invention considers the influence of qualitative index on water resources benefit evaluation, a dynamic evaluation index system of water resources benefit is established, which includes both quantitative and qualitative indexes, By using the variable fuzzy decision model of variable fuzzy set theory, through the change of model parameters such as index weight, index standard value and the solution of model set, the problems of difficult quantification, incomplete evaluation index and simplification of evaluation model in the selection of water resources benefit evaluation method are solved, and the credibility and reliability of optimization decision-making are improved.