102 results about "Phase model" patented technology

The invention relates to a method for history matching a facies geostatistical model using the ensemble Kalman filter (EnKF) technique. The EnKF is not normally appropriate for discontinuous facies models such as multiple point simulation (MPS). In the method of the invention, an ensemble of realizations are generated and then uniform vectors on which those realizations are based are transformed to Gaussian vectors before applying the EnKF to the Gaussian vectors directly. The updated Gaussian vectors are then transformed back to uniform vectors which are used to update the realizations. The uniform vectors may be vectors on which the realizations are based directly; alternatively each realization may be based on a plurality of uniform vectors linearly combined with combination coefficients. In this case each realization is associated with a uniform vector made up from the combination coefficients, and the combination coefficient vector is then transformed to Gaussian and updated using EnKF.

The invention relates to a fiber grating which can realize any target response, which belongs to fiber communication, optical sensor and other relative light signal processing fields. The product is a fiber grating of sampling structure realized with phase model scanning method; the period and phase function of the initial end of the fiber grating, As, Phi s (z) and A s (z) are period, phase function and apodization function of any given fiber grating initial end. And it can acquires distance Zk from the K ultraviolet exposure position to the sample fiber grating initial end and the amplitude Ak of refraction rate modulation leaded in at the Zk. The character of the invention is: its reflection spectrum has multi-channel type, and some special reflection peak in them has the demanded target reflection response, or has the character of target phase shift.

The invention discloses an establishment method for a total-cell three-dimensional two-phase model of a proton exchange membrane fuel cell. The model construction method comprises the steps of constructing a global conservation equation, constructing a liquid water distribution relevant conservation equation, constructing an electrochemical reaction relevant conservation equation, introducing a catalyst layer agglomerate model and constructing an expression of conservation equation source items. Relevant equations are established according to the steps, and through numerical solving calculation, gas concentration distribution, liquid water volume fraction distribution, membrane water distribution and cell performance in the proton exchange membrane fuel cell under a catalyst particle volume fraction and an electrolyte volume fraction in catalyst layers can be obtained. Most traditional models ignore liquid water in channels or do not consider the influence of gas-liquid phase change inthe channels. According to the model, a liquid water saturation equation is solved in the channels, and the gas-liquid phase change process is considered; and after liquid water distribution in the channels is obtained, the influence of liquid water on gas flowing in the channels is reflected through correction of a viscosity value in a gas momentum equation, and therefore a good data basis is provided for further research.

The invention provides a phase model based ship line spectrum noise source position identification method. On an existing single-hydrophone ship-radiated noise measuring platform, instantaneous phase and time-varying amplitude of a Doppler signal are obtained by utilizing a higher-order ambiguous function method according to Doppler effect generated by relative movement between a ship and a measuring hydrophone during measurement, then parameters of the Doppler signal are estimated by using a weighted nonlinear least square method, and a reference sound source is combined, so that positioning of a ship low-frequency line spectrum noise source is achieved. The method is simple to implement, and measuring accuracy of the method is higher than that by a characteristic method.

The invention discloses a time sequence processing method and device for a distributed target InSAR with enhanced space-time coherence. The method comprises the steps of carrying out threshold separation on a permanent scatterer (PS) and a distributed scatterer (DS) on the basis of an obtained single complex image data stack; performing phase stability analysis on separated PS candidate points bymeans of a StaMPS approach to obtain PS points; carrying out covariance matrix estimation on DS candidate points one by one through a maximum likelihood estimator and refining a covariance matrix through a bootstrapped coherence estimator; performing time sequence phase optimization on each DS candidate point; selecting DS points; constructing a two-layer network for the selected PS and DS points;carrying out phase error separation on an unwrapping phase after three-dimensional phase unwrapping is performed on the PS points and the DS points; utilizing the maximum likelihood estimator and a phase model to estimate geophysical parameters. The method can reduce the uncertainty of InSAR time sequence analysis caused by coherence loss and an ill-conditioned matrix, improve the quality controlof time sequence data processing and thus improve the estimation precision and reliability of products.

The invention relates to a same-tower double-circuit DC transmission line double end range finding method having wave velocity correction and belongs to the technical field of electric power system protection. The method includes the following steps: firstly acquiring a line rectification side and inversion side voltage fault component, adopting a phase-model transformation matrix to decouple the voltage fault component and resolve an aerial mode fault component voltage traveling wave; calculating the wavelet transform modulus maxima of the aerial mode fault component voltage traveling wave, obtaining the time t"M, t"N corresponding to the first and the second modulus maxima points; earth faults are arranged every 10 km along the whole length of the same-tower double-circuit DC transmission line and resolving the wave velocities of the earth faults, fitting the wave velocities of the earth faults to obtain an aerial mode wave velocity curve, adopting the iterative method to resolve an aerial mode fault voltage wave velocity v; secondly substituting the aerial mode fault voltage wave velocity v and the time t"M and t"N corresponding to the wavelet transform modulus maxima to a fault range finding formula to resolve x; based on the polarity of the front two modulus maxima points of the aerial mode fault component voltage traveling wave at the rectification side M terminal after head wave alignment, it can be determined that the fault point occurs within a half line length from the rectification side M terminal or out of the half line length.

A high-voltage DC power transmission line single-end protecting method based on wavelet energy relative entropy mainly comprises the steps of 1), performing data acquisition and preprocessing, acquiring a current signal by a current measuring device, performing phase-model transformation by a protective data processing device by means of an orthogonal transformation matrix, and obtaining the inside 1-mode current xa(n) of a line boundary and the outside 1-mode current xb(n) of the line boundary; 2) calculating the wavelet energy relative entropy, namely performing wavelet transformation on the inside 1-mode current Xa and the outside 1-mode current Xb, and calculating the wavelet energy relative entropy M between the inside 1-mode current vector Xa and the outside 1-mode current vector Xb; and 3), performing high-voltage DC power transmission line single-end protection, namely determining whether the wavelet energy relative entropy M is larger than a preset protecting threshold epsilon, if M is larger than the epsilon, determining a fact that the fault occurs in the high-voltage DC power transmission line area by a protecting device. The high-voltage DC power transmission line single-end protecting method has advantages of high identification rate for line faults, more accurate and reliable protection action, and higher capability of ensuring safe and stable operation of the power transmission line.

The invention discloses a method and a device for modeling a reservoir physical property parameter. The method comprises the following steps: firstly, constructing a three-dimensional sedimentary facies model of a reservoir, and establishing a three-dimensional reservoir petrophysical facies model under the restriction of the three-dimensional sedimentary facies model; secondly, establishing a three-dimensional reservoir physical property parameter model under the restriction of the three-dimensional reservoir petrophysical facies model. Compared with the prior art, the method and the device have the advantages that when a reservoir petrophysical property parameter model is constructed, sedimentary facies restriction is considered, and the influence of reservoir petrophysical facies is also considered, so that a modeling result can reflect a combined action of a reservoir sedimentation action, a diagenesis action and a later-stage construction action, thereby improving the modeling accuracy of the reservoir physical property parameter.

A method for monitoring a thrust fault of a turbofan during a modification of the thrust setting of the turbofan, the method including a step of processing the thrust setting via a filtering function and a transient-phase model such as to obtain a modelled thrust, a step of comparing the modelled thrust to the actual thrust such as to determine a thrust difference, a step of comparing the thrust difference to an alarm threshold; and a step of emitting an alarm in the event of exceeding the alarm threshold, wherein at a given iteration, in which the prior modelled thrust is known, the transient-phase model provides a time constant in accordance with the prior modelled thrust, and the filtering function provides a modelled thrust in accordance with the time constant obtained, the prior modelled thrust and the thrust setting.

The invention discloses a seismic fluid inversion identification method and apparatus. The method includes the following steps that: a three-dimensional rock physical phase model of a reservoir is established, and an initial model of seismic inversion is established under the constraint of the three-dimensional rock physical phase model; and pre-stack seismic inversion can be realized through utilizing seismic data of different angles, and therefore, inversion identification of the fluid of the reservoir can be completed. According to the reservoir rock physical phase constraint-based seismic fluid identification method provided by the invention, the apriori constraint of reservoir rock physical phase is considered in inversion, and fluid distribution obtained through inversion can accord with geological priori knowledge, and fluid prediction results have geological significance.

The invention discloses a method for improving spaceborne double station difference InSAR extraction deformation precision. For a problem that no corresponding phase model is for spaceborne double station difference InSAR deformation monitoring, a spaceborne double station difference InSAR phase model is established, and a method utilizing a spaceborne double station difference interference phase to acquire surface elevation deformation is further established. The method is advantaged in that compared with spaceborne double station difference InSAR in the prior art, a transformation factor between the space-variant spaceborne double station difference InSAR phase and surface deformation is acquired through the spaceborne double station difference InSAR phase model, accuracy of deformation estimation of a deformation region is improved; monitoring efficiency is high, the method is convenient for enforcement, the result is visual and clear, and the method further has great practical values and wide application prospects in the surface deformation monitoring application field of large-area deformation regions of glacier change and mining subsidence.

The invention discloses a pulsar signal phase delay estimation method considering a spacecraft orbit dynamic effect. The method comprises the following steps: firstly, obtaining an estimated positionand speed of a spacecraft at any photon arrival moment by utilizing an orbit kinetic model propagating orbit, obtaining an estimated phase value at any photon arrival moment through large-scale time conversion and a phase model at an SSB, and estimating Doppler frequency shift introduced by an initial speed error of the spacecraft; and after Doppler frequency shift is corrected, obtaining an observation pulse profile through periodic folding, estimating phase delay introduced by an initial position error, and obtaining the phase delay of the spacecraft at the observed quantity updating momentby adding the phase delay introduced by the initial position error and accumulated phase delay introduced by Doppler frequency. According to the method, the influence of on-orbit motion characteristics of the spacecraft on the X-ray pulsar signals does not need to be corrected under the assumption that the initial speed of the spacecraft is known, the huge operand of joint search Doppler frequencyand phase delay is avoided, operability is high, and implementation is easy.

The invention relates to a phase-field method-based bending dendritic crystal growth simulation method. The phase-field method-based bending dendritic crystal growth simulation method comprises the following steps: simplifying conditions and initializing a model; establishing a macroscopic temperature field equation and a transient dendritic crystal growth deviation angle equation; establishing amicrostructure evolution model and establishing a phase field model for simulating bending dendritic crystal growth based on a Ginzburg-Landau theory; and performing macroscopic-microcosmic coupling calculation, introducing a macroscopic temperature field and a dendritic crystal growth deviation angle into the field phase model, and calculating the growth process of the bending dendritic crystal to finally obtain the shape of the bending dendritic crystal. According to the phase-field method-based bending dendritic crystal growth simulation method, formation of the bending dendritic crystal inthe solidification process can be simulated and predicted quantitatively, the formation process of the solidified microstructure dynamically reappears, deep understanding of the evolution process ofthe solidified microstructure is facilitated, and basis is laid for microstructure evolution research and process optimization.

The invention discloses a personalized service recommendation method of network television for large-scale users. The personalized service recommendation method of network television for large-scale users utilizes large-scale user and user attribute and behavior data to realize user image modeling based on big data, and constructs context modeling based on big data by extracting scene informationsuch as time, place and weather. In the offline computing stage, the scalability problem of the algorithm is solved by user and item double clustering, and the training model and fitting parameters are combined with techniques such as matrix decomposition and collaborative filtering. In the online calculation stage, the incremental calculation recommendation model based on quadratic matrix sampling is designed, and the newly added interactive data is used to realize real-time online recommendation. Finally, the recommendation results of the offline phase and the online phase model are merged to form an initial Top-K recommendation list, and then the context filtering is performed based on the information in the context modeling to form a final Top-N recommendation list. Thus, the accuracyof personalized service recommendation of network television for large-scale users is improved.

The invention relates to a UPFC-contained line single-end traveling wave distance measurement method based on fault traveling wave line distribution characteristics, and belongs to the technical field of electric power system relay protection. A measuring end high-speed collection device obtains measuring end fault current travelling wave data, and voltage travelling waves are constructed by current travelling waves and wave impedance of an adjacent healthy line; secondly, phase-model conversion operation including a faulted phase is carried out to obtain line-model voltage travelling waves and line-model current travelling waves; then, according to line-model currents and line-model voltages, a Bergeron transmission equation is utilized to calculate the line distribution of voltage and current traveling wave abrupt changes, wherein a line calculation step is 0.1 m; and finally, when a measuring end is arranged in time windows, the absolute values of the traveling wave abrupt changes are calculated and then are integrated to obtain distance measurement functions fMuI(x), fMuII(x), fNuI(x) and fNuII(x), and distance measurement of a fault is realized according to the distribution rule of distance measurement function line abrupt changes.

The invention discloses a Matlab-based visual automatic generation method for a transformer three-phase model. The method comprises the following steps of establishing an original admittance matrix Yp of a three-phase transformer; selecting original secondary line winding connection and group of the three-phase transformer; forming an associated matrix C and modifying the original admittance matrix Yp; deriving a node admittance matrix YTn of the three-phase transformer by symbolic operation; dividing a result of the node admittance matrix YTn of the three-phase transformer obtained by the symbolic operation into four three-order sub-matrixes; and performing display in a formula form directly on an axes control in an interface established by a GUI of Matlab after latex function conversion and processing. According to the method, visualization is realized and software functions are perfected; and the node admittance matrix of the transformer is displayed after being divided into the four sub-matrixes, so that the problem that the axes control cannot display the whole node admittance matrix of the transformer can be solved and the efficiency and accuracy of solving the three-phase model of the three-phase transformer are improved.

The invention discloses an asymmetric six-phase PMSM model prediction flux linkage control method considering duty ratio optimization. The method comprises the following steps: firstly, constructing 12 active virtual voltage vectors and 1 zero virtual voltage vector by utilizing a vector synthesis principle, and realizing the harmonic current suppression of a harmonic sub-plane while reducing a vector to be evaluated; secondly, constructing a value function only involving stator flux linkage and eliminating the problem of weight coefficient adjustment caused by traditional model prediction torque control; thirdly, evaluating 13 virtual voltage vectors by using the value function and calculating a corresponding value function value; and finally, determining an optimal action vector set, calculating the duty ratio of vectors in the set, and outputting a corresponding PWM pulse to act on an inverter. According to the method, the calculation burden of the system can be reduced, the harmonic current of the harmonic sub-plane is suppressed, the steady-state performance of the system is improved, the switching frequency of the inverter is fixed, and the advantage of fast dynamic responseof traditional model prediction control is reserved.

The invention discloses a pore, cave and fissure three-dimensional distribution representation method in an oil-gas reservoir, which comprises the following steps: 1, pores, caves and fissures in the oil-gas reservoir are recognized through observation; 2, according to reservoir permeability of the pores, the caves and the fissures, pore, cave and fissure combination types are distinguished, and the combination types are mapped to corresponding reservoir permeability medium phase types; and 3, on the basis of reservoir permeability medium phase data discrete processing, a random modeling method is used for establishing a reservoir permeability medium phase model for representing pore, cave and fissure three-dimensional distribution. According to the disclosed representation method, cross-scale transfer and multi-space fusion of the pore, cave and fissure information can be realized, and multi-scale pore, cave and fissure space distribution features are described in the same geological model.

The invention relates to a STATCOM-contained line single-end traveling wave distance measurement method based on fault traveling wave line distribution characteristics, and belongs to the technical field of electric power system relay protection. When a line has a fault, a measuring end high-speed collection device obtains measuring end fault current travelling wave data, and voltage travelling waves are constructed by current travelling waves and wave impedance of an adjacent healthy line; secondly, phase-model conversion operation including a faulted phase is carried out to obtain line-model voltage travelling waves and line-model current travelling waves; according to line-model currents and line-model voltages, a Bergeron transmission equation is utilized to calculate the line distribution of voltage and current traveling wave abrupt changes, wherein a line calculation step is 0.1 m; and finally, in time windows [t0, t0+1/(2v)] and [t0+1/(2v), t0+1/v], the absolute values of the traveling wave abrupt changes are calculated and then are integrated to obtain distance measurement functions fuI(x) and fuII(x), and distance measurement of the fault is realized according to the distribution rule of distance measurement function line abrupt changes.

The invention discloses a modeling method for quality classification representation of multiple sandstone gas reservoir gas layers, and relates to a six-stage modeling method. A new method of two-layer construction modeling, two-level secondary-phase modeling and four-type reservoir property modeling is proposed according to multi-layer-steamed-bread-shaped multi-layer sandstone gas reservoir planar sedimentary stability and a multi-layer structure formed by a vertical sand mud interbed, a six-stage modeling method system including stratum construction modeling-sand body structure modeling-sand body microfacies modeling-storage-collection phase modeling-reservoir property modeling-gas layer quality classification modeling is built, and accurate quantitative representation of the multi-layer-steamed-bread-shaped multi-layer sandstone gas reservoir gas layer quality in three-dimensional space is achieved. Compared with a gas reservoir model built with a traditional three-stage modeling method, the multi-layer sandstone gas reservoir gas layer quality classification model obtained with the six-stage modeling method is more accurate and exquisite, and is widely applicable to meeting the urgent requirement for gas reservoir classification balance development in the middle and later periods of multi-layer sandstone gas reservoir development.

The invention discloses a double-navigation InSAR three-dimensional deception jamming method. The method includes the following steps that (1), a jamming phase model generated by SAR deception jamming in the double-navigation jamming process is obtained; (2), phase jamming generated by SAR deception is offset, and a three-dimensional deception phase is designed according to a false elevation; (3), signals emitted by a jammer and provided with a predesigned false phase are generated; (4), the emitted signals are decomposed of a time-dependent part and a time-independent part according to taylor formula development; (5), the emitted signals are designed in a convolution mode to achieve rapid three-dimensional deception. The double-navigation InSAR three-dimensional deception jamming method can achieve effective deception of SAR images and effective deception of jamming phase and elevation information.

The invention belongs to the technical field of multiphase flow metering and particularly relates to a double-nozzle based online calculation method of oil well multiphase flow split-phase content. The method comprises steps as follows: (1) acquiring an instantaneous differential pressure value of two nozzles; (2) calculating a standard difference of differential pressure signal fluctuations; (3)performing dimensionless processing on the standard difference; (4) fitting a related expression of a dimensionless parameter Z1 with air content and a Reynolds number; (5) fitting a related expression of a dimensionless parameter Z2 with air content and a Froude number; (6) performing simultaneous processing on the related expressions to obtain a related expression of the air content and the dimensionless parameters; (7) obtaining water content W through a radio frequency water content measuring device; and (8) calculating total flow by use of a multiphase flow split-phase model. By means ofthe provided calculation method, flowing influences are considered by adding the Reynolds number and the Froude number, and the calculation accuracy is ensured.

The invention discloses a single-phase grounding fault wire selecting method and a system thereof, wherein the method comprises the steps of respectively acquiring each line transient voltage signal by a voltage acquisition device; performing phase-model transformation on each line transient voltage signal by a data processing device, obtaining each line zero-module voltage and each line line-module voltage; performing wavelet transformation on each line zero-module voltage and each line line-module voltage by an upper computer for obtaining a corresponding zero-module voltage one-layer component and a line-module voltage one-layer component; determining the highest value of each line zero-module voltage one-layer component as a first suspected fault line by the upper computer, and determining the highest value of each line line-module voltage one-layer component as a second suspected fault line; determining whether the first suspected fault line and the second suspected fault line aresuperposed by the upper computer, and if yes, determining the line as the fault line. The single-phase grounding fault wire selecting method prevents a mis-judgment possibility caused by low line zero-sequence current and improves wire selecting reliability.