80 results about "Apparent velocity" patented technology

The invention discloses a high-precision pickup method of the first arrival of microseism. The high-precision pickup method comprises the steps that the signal to noise ratio of microseism data is increased through the higher moment method; according to the fact of whether the current microseism wave meets all the following constraint conditions, namely the relation between the magnitude of amplitude and space, the lineup apparent velocity and the polarization characteristics, whether the microseism wave is the first arrival of the microseism is judged; according to perforation data, actual event data and the change rule of constraint conditions, by the adoption of a statistical analysis method, the threshold value of the constraint conditions is determined; under the constraint of the amplitude and the apparent velocity, according to the temporal and spatial variation characteristics of the travel time first arrival of a microseism event, the change law of the energy, the apparent velocity and the relevant information of travel time first arrival points in a big fixed time window and a small sliding time window is utilized for automatic pickup of the first arrival of the microseism event by means of the repeated iteration method. Application effects of the actual data of different areas show that the high-precision pickup method of the first arrival of the microseism is high in adaptability and reliable in result.

The invention provides a regular linear interference suppressing method based on polynomial fitting, comprising the following steps of: (a) artificially recognizing an apparent velocity range of regular linear interferences; (b) performing frequency separation processing on the acquired seismic data through wavelet transform, thereby obtaining low frequency data and high frequency data; (c) determining an apparent dip range of noise data according to the apparent velocity range of the noise data, performing optimal mid-value scanning of apparent dips, and determining the optimal direction of the regular linear interference at the current apparent dip; (d) performing polynomial fitting on the noise data in the optimal direction of the regular linear interference; (e) repeating the steps (c) and (d) until all regular linear interferences in the low frequency data are fitted out; (f) reducing the fitted regular interference data from the original low frequency data obtained through frequency separation, thereby obtaining low frequency data after the regular interference is suppressed; and (g) obtaining the seismic data after the noise is suppressed according to a polynomial fitting rule from the low frequency data after the regular interference is suppressed and the original high frequency data after frequency separation.

The invention discloses a remote exploration sound wave processing method. The method comprises the steps that (1) waveform data of remote exploration acoustic logging dipole components are preprocessed through a least square deconvolution processing method, and a waveform oscillation period is shortened; (2) the waveform FW(t) obtained in the second step is separated through a median filtering method to obtain a direct wave D(t), and the D(t) is subtracted from the FW(t) to obtain a reflected wave; (3) the reflected wave is separated through an f-k filtering method to obtain an upward reflected wave and a downward reflected wave, wherein time-domain waveform data under a fixed source distance are subjected to two-dimensional Fourier forward transformation, full-wave data are converted into a frequency-wavenumber domain, and the upward reflected wave apparent velocity and the downward reflected wave apparent velocity are finite values; (4) the upward reflected wave and the downward reflected wave which are separated are processed through a diffraction scanning migration stacking and imaging method; (5) filtering processing is conducted. By means of the method, according to the character that an orthogonal dipole probe is low in transmitting frequency during multi-pole subarray acoustic logging, the measured data can reflect far stratum information, and the orientation, dip angles and distribution of cracks and holes in a stratum far from a well can be obtained.

The embodiment of the invention discloses a method and a device for picking up the primary arrival of seismic waves. The method includes the steps of determining a first primary-arrival set of a plurality of seismic trace data which satisfy a specified condition; carrying out fitting treatment on apparent velocities respectively corresponding to a plurality of primary arrivals and offset distancescorresponding to the plurality of seismic trace data, determining target time window ranges respectively corresponding to the plurality of seismic trace data according to the fitting result, determining a second primary-arrival set of a plurality of seismic trace data, determining a target time window range and a second primary-arrival set through iteration until the absolute value of the difference between the primary arrival values of adjacent seismic trace data in the second primary-arrival set is smaller than a preset time difference threshold value; determining final time window ranges respectively corresponding to the plurality of seismic trace data, determining a target primary arrival set of the plurality of seismic trace data so as to enable the target primary arrival set to meetthe specified condition, and enabling the absolute value of the difference between the primary arrival values of adjacent seismic trace data to be smaller than the preset time difference threshold value. The precision of the primary arrival of picked-up seismic waves can be improved.

The invention provides a self-adaption surface wave attenuation method and belongs to the field of oil geophysical prospecting. The self-adaption surface wave attenuation method firstly conducts lowpass filtering on seismic record to obtain dominated records of the surface wave, and then uses Hilbert conversion to convert the records into analytic signals and uses an envelope amplitude difference theory to seek an optimized apparent velocity of each sampling point, and then chooses a space-time window in the sampling point along the optimized apparent velocity and uses the singular value decomposition to choose the preceding one or two maximum singular value to reconstruct space-time signals, and only the current amplitude value of the sampling point can be saved, and a surface wave model can be formed after procedures are completed one by one. Then, matched filtering between the surface wave model and original records is conducted to further revise a wave shape difference of the surface wave model. Lastly, the surface wave model is substracted from the original records and final results are obtained. The self-adaption surface wave attenuation method achieves the accurate positioning of each surface wave direction, so that vertical and horizontal amplitude changes of the surface wave in the seismic records can be overcome to a certain extent, so the self-adaption surface wave attenuation method has a adaptivity.

The invention discloses a continuous hydrogenation method for olefin unsaturated bond-containing polymer. The method comprises a step of contacting a solution of the olefin unsaturated bond-containing polymer with hydrogen for hydrogenation in the presence of a hydrogenation catalyst, wherein a hydrogenation reactor used comprises two or more than two serially connected reactors; in the hydrogenation process, reaction effluent of a first reactor is divided into two parts, one part enters a second reactor, and the other part exchanges heat with a heat exchanger and is recycled to return the first reactor; by controlling the apparent velocity of hydrogen bubbles flowing through a reaction mixture and the circulating flow of the reaction effluent, the first reactor approaches full-Francis operation, and the second and subsequent reactors approach piston flow operation; and the reaction mixture is continuously hydrogenated through hydrogen dissolved in the reaction mixture by maintaining the hydrogen pressure in the reactor. By the method, the hydrogen and the polymer solution are fully contacted uniformly, so the hydrogenation efficiency is improved; and the temperature in the hydrogenation process can be stably controlled, so the catalyst is prevented from being deactivated due to high temperature; therefore, products with an ideal hydrogenation degree are stably obtained in a long operating period. Meanwhile, material consumption, energy consumption and operating cost in the reaction process are reduced.

The invention discloses a control method for reducing grand gesture perturbation under interative guidance, comprising the following steps of: acquiring data, calculating apparent velocity increment; smoothly processing axial apparent acceleration; substituting the smoothed complete combustion time Tauin into an aircraft interative guidance formula to obtain the smoothed iterative program angle Psicxn; and finally carrying out amplitude limiting processing on iterative program angle increment delta Psicx at the current moment to obtain a stable iterative program angle output value at the current moment. In the invention, smooth and amplitude limiting measures are taken in the whole process of generating iterative program angle so as to reduce the grand gesture perturbation and ensure thatthe input quantity adopted by subsequent interative calculation and the smooth transition output by the iterative program angle cannot generate jumping, thereby ensuring that the input of a gesture control system cannot generate jumping and being greatly beneficial to improving the reliability of an aircraft control system and reducing the interference and influence in the flying; the grand gesture perturbation under interative guidance can be reduced by adopting the method without improving the sampling resolution of hardware, i.e without modifying an aircraft device; and the invention is simple and rapid, and has remarkable effect for reducing the gesture perturbation.

The invention provides a scalariform two-dimensional wide-band observation system design method improving the signal-to-noise ratio of a seismic prospecting imaging section. The method comprises the following steps: applying known seismic data and well data; investigating the apparent velocities and wave lengths of interference waves on the side face of an exploratory area; determining the minimum and maximum widths, the maximum receiving line interval and the receiving line number of an observation system as well as the element intervals of a geophone array; symmetrically combining geophones into basic units in the horizontal and vertical directions by taking receiving points as centers, wherein the transverse array lengths are equal to receiving line intervals, the vertical and horizontal array lengths are equal to track pitches, and the basic units are combined in a matching way in the vertical and horizontal directions according to the geophones. With adoption of the method, spatial continuous noise suppressing is realized, so that the effect that the receiving lines of the observation system unite to suppress noise horizontally is really realized, simultaneously the deficiency in spatial sampling is made up to, avoid alias noise, and improvement of the quality of a source material and the signal-to-noise ratio of the imaging section is facilitated.

The invention relates to a method for improving a seismic processing signal to noise ratio and resolution ratio for geophysical exploration seismic data processing, comprising: determining the apparent velocity of the surface wave according to a single shot record; carrying out small time window and space window division on the single-shot seismic record data; carrying out linear energy dip angle scanning on the divided space window; selecting the dig angle of the strongest linear energy; when the speed corresponding to the line of the maximum value of the amplitude quadratic sum is between the maximum apparent velocity and the minimum apparent velocity of the surface wave, attenuating because of determining as the surface wave; and otherwise, carrying no attenuation because of determining as the effective signal. The linear energy scanning method favorably separates the surface wave and the effective signal, and then the surface wave is attenuated to protect the effective signal; meanwhile, the purpose of improving the signal to noise ratio and the resolution ratio in the seismic data processing can be realized; and surface wave attenuation performance is improved.

The invention provides a linear denoising method based on a multi-core processor, which comprises the steps that: multi-shot earthquake data is read into a main node of the multi-core processor; the main node distributes a plurality of pieces of single-shot earthquake data in the multi-shot earthquake data to a plurality of sub-nodes of the multi-core processor; all the sub-nodes carry out lineardenoising to the single-shot earthquake data from the main node; and the main node collects the single-shot earthquake data which is linearly denoised from the sub-nodes, and outputs linearly denoised earthquake data. Wherein, when the sub-nodes carry out linear denoising, every time when the velocity of linear interference which is scanned from the single-shot earthquake data to be processed is consistent with any apparent velocity within a preset linear interference apparent velocity range, an optimized prediction filter operator is used for each frequency component in a frequency domain for prediction filtration along an X-direction after the same-phase shaft of the linear interference is flattened.

The invention discloses a near-surface shear wave interval velocity model establishment method. The method includes: A, sorting original shot point arrangement data according to a preset spatial sampling interval and source-receiver azimuth to acquire input data; B, analyzing the input data to acquire pure surface wave data; C, calculating surface wave dispersion data of a receiving point according to the pure surface wave data; D, correcting velocity parameters of the surface wave dispersion data of the receiving point from surface azimuth apparent velocity to true velocity according to a surface inclination angle of the source-receiver azimuth; E, subjecting surface wave dispersion data of each co-receiving point to true velocity curve statistics to form unique dispersion data of each co-receiving point; F, calculating a near-surface shear wave interval velocity model according to the unique dispersion data of each co-receiving point. The near-surface shear wave interval velocity model established according to the method is high in accuracy, three-dimensional seismic data surface waves can be effectively extracted while high-precision dispersion data are acquired, and converted shear wave correction accuracy in multiwave seismic data processing is improved.

The invention discloses a t-f-k field polarization filtering method for multi-component seismic data. The method comprises the steps of inputting multi-component seismic shot-gather data; acquiring the vertical component and the radial component of the multi-component seismic shot-gather data; generating complex-vector shot-gather seismic data with the vertical component as an imaginary part and the radial component as a real part; setting a time window length, an elliptical polarizability filtering threshold and a frequency threshold; converting the t-f-k transformation on the complex-vector shot-gather seismic data to obtain a three-dimensional time-varying frequency wave spectrum; according to the positive and negative frequencies of the three-dimensional time-varying frequency wave spectrum, acquiring an elliptical polarizability; according to the elliptical polarizability, the elliptical polarizability filtering threshold and the frequency threshold, acquiring a filtering function; conducting the three-dimensional median filtering on the filtering function; filtering the three-dimensional time-varying frequency wave spectrum based on the filtering function; and conducting the t-f-k transformation on the filtered three-dimensional time-varying frequency wave spectrum. According to the technical scheme of the invention, the problem in the prior art that rayleigh surface waves and transverse waves cannot be effectively separated from each other due to the small difference between the frequencies and the apparent velocities of the rayleigh surface waves and the transverse waves can be solved.

The invention provides a coherent noise suppression method based on fractional order Fourier transformation. The method comprises the following steps of: estimating a frequency band and an apparent velocity range of coherent noises in monitored seismic data and extracting the seismic data in the frequency band; in the apparent velocity range, determining an apparent velocity direction corresponding to the apparent velocity by aiming at the extracted seismic data in the frequency band; determining an apparent dip angle according to the apparent velocity and the corresponding apparent velocity direction; carrying out fractional order Fourier transformation on the extracted seismic data in the frequency band according to the apparent dip angle; carrying out coherent forecasting on the seismic data subjected to the fractional order Fourier transformation to obtain forecasted coherent noises; and eliminating the forecasted coherent noises from the monitored seismic data.

The invention belongs to the technical field of fluid measurement, and relates to a two-phase flow velocity acoustoelectric bimodal measuring method. The method comprises the following steps: (1) using an electrical sensor to calculate the phase fraction of a two-phase flow based on an electrical capacitance method; (2) calculating the mixed sound velocity of the two-phase flow; (3) determining a measurement space; (4) calculating the average flow velocity of discrete phase in the measurement space through ultrasonic Doppler frequency shift; (5) using a drift model to calculate the average flow velocity in the measurement space; (6) calculating the total flow velocity based on the average flow velocity in the measurement space; and (7) calculating the total average flow velocity and split-phase velocity of the two-phase flow, and further calculating the water-phase apparent velocity and the oil-phase apparent velocity based on the phase fraction obtained by the electrical sensor. The measuring method of the invention has the advantages of convenient measurement, high speed and low cost, and can be used to accurately measure the average flow velocity and phase fraction of a two-phase flow in a pipe.

The invention relates to a guidance control method for a carrier rocket, which is characterized by comprising the following steps: binding standard values such as a standard speed module value v, guidance constant coefficients kuPhi(v) and kuPhi(v) corresponding to the standard speed module value v, and guidance amplification coefficients Kd<Phi> and Kd<Psi>, and the like; according to linear interpolation of two points, calculating the guidance constant coefficients k'uPhi(v) and k'uPsi'(v) of the current point; calculating the guidance weight function I(t) of the current point; further calculating the guidance quantity UPhi(v) and UPsi (v) of the current point, and carrying out amplitude limiting on Uphi(v) and UPsi (v) and then outputting to an attitude control system. By directly adopting rocket speed (or apparent velocity) for replacing the existing universal speed and taking flying time as independent variable, the guidance control method leads guidance calculation process not tobe influenced by each-class shutdown, separation and injection time deviation anymore and improves accuracy of guidance.

The invention relates to the field of radar signal processing, in particular to a pulse Doppler radar velocity ambiguity resolving method. The method comprises the three main steps that A, a velocityestimation interval is divided according to radar parameters, a target apparent velocity and a first threshold, and possible velocity matrixes are screened out; B, screening is performed on the possible velocity matrixes according to a second threshold, and velocity matrixes about to judge authenticity are obtained; and C, velocity difference screening is performed on the velocity matrixes about to judge authenticity, pseudo-velocities are eliminated, and target real velocity matrixes arranged according to the descending order of confidence are obtained. Through the method, Doppler velocity ambiguity can be resolved under the situation that echo information of a moving target is not ideal and distance ambiguity is not introduced, and therefore real velocities of the moving target are obtained.

The invention relates to an acoustic-electric double-mode measurement method for the velocity of a gas-liquid two-phase bubbly flow. An ultrasonic transducer containing a bi-piezoelectric ceramic wafer and a capacitance-conductance sensor are adopted. The method comprises the following steps: acquiring the moisture content H; measuring the average real velocity of bubbles in a space; calculating the drag force between a continuous liquid phase and a disperse gas phase; calculating the shearing force of the pipe wall on the continuous liquid phase; getting the real velocity of the liquid phase through a numerical iterative algorithm; calculating the apparent velocity of the liquid phase and the apparent velocity of the gas phase; and calculating the total apparent velocity of a gas-liquid bubbly flow according to the definition of total apparent velocity of a two-phase flow.

The invention provides a surface wave attenuating method and device. The method comprises steps as follows: according to differences between surface waves and reflected waves in aspects of spatial distribution ranges, energy and the like, by the aid of characteristics of frequency dispersion and linear distribution of the surface waves, under the constraint of the maximum apparent velocity of the surface waves, multiple dip angles are formed by several rays to simulate multiple dip angles formed by the surface waves on a shot gather record, then whether the surface waves exist or not is judged according to differences between the surface wave energy of different rays, and if the surface waves exist, surface wave suppression is performed with a radial median filtering technology. With the adoption of the method and the device, the surface waves can be attenuated, the signal-to-noise ratio and the resolution of seismic data can be increased, and effective signals in the surface wave frequency band range can be better protected.

The invention provides a suppressing method suitable for loess plateau out-of-line ground roll waves. The suppressing method comprises the steps of: 1) performing offset geometric transformation on X to obtain X'; 2) determining an apparent velocity range of ground roll waves; 3) determining a ground roll wave frequency band range on the X'; 4) acquiring G' via G; 5) seeking an orthogonal projection vector matrix of the single shot seismic record G', and performing K-L transformation on the G'; 6) reconstructing a ground roll wave model G'' by utilizing the K-L transformation; 7) acquiring a ground roll wave final model G''' via the G''; acquiring a single shot seismic record X'' after suppressing the ground roll waves; 9) repeating the steps from step 3) to step 8) to obtain a single shot seismic record X''' after suppressing the ground roll waves finally; and 10) performing offset geometric inverse transformation on the single shot seismic record X''' to obtain X'''', and finishing the suppression of the ground roll waves. The suppressing method adopts frequency division processing, automatically adjusts and tracks change features of the ground roll waves under different geological conditions, so as to achieve the wave field separation and de-noising, can increase the continuity of a mesozoic tight oil target layer, and has amplitude fidelity characteristics.

The invention relates to a method for measuring the flow of emulsion through combination of a conductivity sensor and an electromagnetic flowmeter. The conductivity sensor is a focusing arc-shaped wall-to-wall type conductivity sensor. During data processing, voltage signals of the field focusing arc-shaped wall-to-wall type conductivity sensor under different flowing working conditions are subjected to normalization processing, and the moisture content measuring feature of the focusing arc-shaped wall-to-wall type conductivity sensor is extracted; a relation chart among the emulsion mixing flow rates measured by the electromagnetic flowmeter under the different flowing working conditions, the calibrated emulsion mixing flow rate and the moisture content is obtained according to a fitting function relation between the output voltage of the electromagnetic flowmeter under the all-water condition and the calibrated mixing flow rate; and by the adoption of the water holding ratio parameter measured by the field focusing arc-shaped wall-to-wall type conductivity sensor and the mixing flow rate parameter measured by the electromagnetic flowmeter, an oil-in-water emulsion drifting model is built, and the split-phase apparent velocity forecast is achieved.

The invention discloses a method for separating harmonic waves in sleeves in seismic exploration. Median filtering and band-pass filtering are combined by the aid of differences among apparent velocities of seismic waves in the method. The method includes picking up an initial time point and a first time point from original data, adding the initial time point and the first time point of a trace of the original data to time points of various sampling points and leveling upward traveling waves to obtain a first wave field; performing filtering for the first wave field by the aid of an initial time point, a first time point and a second time point of the first wave field to obtain a second wave field; performing Fourier transformation to filter out signals outside frequency bands to obtain a third wave field; subtracting the third wave field from the first wave field to obtain a fourth wave field, picking up a horizontal even in the fourth wave field and performing filtering along a depth direction to obtain a fifth wave field; filtering signals outside frequency bands to obtain a sixth wave field; subtracting the sixth wave field from the fourth wave field to obtain a seventh wave field; repeating the process from a third step to a seventh step once by using the seventh wave field as a first wave field to obtain an eighth wave field; performing filtering by the aid of an initial time point and a first time point to obtain a ninth wave field; subtracting the initial time point and the first time point of the sampling points in each trace from the time points of the sample points to obtain a tenth wave field; and subtracting the tenth wave field from the original data to separate the harmonic waves. The method has the advantages that only seismic waves containing harmonic interference are suppressed, the harmonic waves of the sleeves are effectively separated, and seismic traces without harmonic interference cannot be damaged.

The invention provides a wet electric precipitator, comprising a tubular shell, an anode plate, a cathode wire, an anode plate flushing nozzle and a cathode wire flushing nozzle, wherein the anode plate comprises two groups of anode plate bodies which are symmetrically distributed; the symmetry plane is an axial plane of the tubular shell passing through the center axis; the two groups of anode plate bodies respectively comprise a plurality of parallel anode plate bodies; the corresponding anode plate bodies in the two groups of anode plate bodies are intersected on the symmetry plane, or extension surfaces of the corresponding anode plate bodies are intersected on the symmetry plane; an inclination angle alpha is formed between the anode plate bodies and the symmetry plane; alpha is smaller than 90 degrees and greater than 0 degrees; the cathode wire and the corresponding intervals of the anode plate bodies are arranged in parallel, and are symmetrically arranged along the symmetry plane simultaneously; the cathode wire is transversely arranged and horizontally extends towards the tubular shell from the position of the symmetry plane. By adopting the wet electric precipitator, a flue gas blind zone can be effectively reduced, the same flue gas velocity and apparent velocity of the flue gas are designed in an electric field zone, and abundant flue gas residence time in the electric field zone is ensured, so that the dust removal efficiency achieves the design level, and the effective dust collection area of a polar plate is effectively increased.

The invention discloses a method and system for eliminating outlier interference of seismic data. The method comprises the steps of picking up an outlier trace based on original shot gather data, anddetermining the apparent velocity at the top of a head wave band and the time window length of the head wave band; calculating the top time of a head wave band time window corresponding to each seismic trace, determining the head wave band time window corresponding to each seismic trace, and obtaining a head wave horizontal time window and a reflected wave horizontal time window corresponding to each seismic trace; calculating the maximum value of the absolute amplitude of the outlier trace and the average of the maximum absolute amplitudes of adjacent normal traces within the time window, calculating an amplitude correction factor, obtaining an amplitude correction value, and obtaining an outlier trace after the amplitude correction; and carrying out spatial median filtering to obtain a median filtering value, replacing the amplitude correction value with the median filtering value to obtain a replacement seismic trace, and obtaining seismic traces with the outlier interference beingeliminated. The method can effectively eliminate the influence of outlier interference without transforming the normal seismic traces, thereby avoiding data distortion of the normal seismic traces.

The present invention discloses an aromatic hydrocarbon oxidation method, which comprises that a reaction material containing at least an aromatic hydrocarbon, an oxidizing agent and a solvent sequentially flows through catalyst bed layers from 1 to n under an oxidation reaction condition, wherein n is an integer of more than 2, and the catalyst bed layer is filled with at least a titanium-silicon molecular sieve; and when the reaction material passes through the catalyst bed layers from 1 to n, at least a flow carrier is introduced into the position between at least a pair of the adjacent catalyst bed layers among the catalyst bed layers from 1 to n, such that the apparent velocity of the reaction stream positioned in the downstream catalyst bed layer is higher than the apparent velocity of the reaction stream positioned in the upstream catalyst bed layer in the pair of the adjacent catalyst bed layers by adopting the flowing direction of the reaction material as the reference. With the method of the present invention, the one-way service life of the titanium-silicon molecular sieve can be effectively prolonged, the effective utilization rate of the oxidizing agent can be improved, and the target product selectivity can be improved.