33 results about "Wave train" patented technology

The invention discloses a well hole sound wave speed obtaining method and device based on frequency domain analysis, and relates to the field of geophysical acoustic logging, and the method comprises the steps: obtaining an array waveform signal obtained by carrying out full wave train sound wave logging on a target layer section; performing Fourier transform on the array waveform signal to obtain a waveform frequency spectrum signal; extracting a noisy frequency dispersion signal from the waveform frequency spectrum signal, and carrying out noise reduction processing on the noisy frequency dispersion signal to obtain an effective frequency dispersion signal; and performing signal analysis processing on the effective frequency dispersion signal to obtain the well hole sound wave speed. According to the method, real-time acquisition of the stratum sound velocity can be realized while the acoustic logging data is acquired, the accuracy and stability of sound velocity acquisition are improved, the problems that a traditional frequency domain processing method needs manual interaction, the processing efficiency is low and the like are solved, and the problems that a sound velocity processing result is inaccurate and unstable are solved; and the defects of a time domain sound velocity real-time processing method are overcome.

This application relates to the field of medical ultrasound measurement technology, specifically providing a method for in-situ measurement of skull thickness and sound velocity using ultrasound. The method includes: acquiring reflected echo data from N transmitting array elements, wherein the N transmitting array elements sequentially transmit ultrasound waves to the location to be measured on the skull, and array elements centrally symmetrical to the transmitting array elements receive the reflected echoes of the ultrasound waves; arranging the reflected echo data from the N transmitting array elements together to form a wave train diagram of the N transmitting array elements; extracting the sound pressure amplitude values ​​corresponding to the normal incident reflection time from the wave train diagram, and superimposing the extracted sound pressure amplitude values ​​to form a superimposed amplitude spectrum, with the maximum superimposed sound pressure amplitude value corresponding to the wave train diagram being the equivalent matching velocity; and calculating the sound velocity and thickness at the location to be measured on the skull based on the equivalent matching velocities at the maximum superimposed sound pressure amplitude values ​​and the normal incident reflection time. This method can accurately measure the sound velocity and thickness of the skull in situ.

A method for determining a probe signal for acoustically interrogating an electrochemical system, the method including transmitting a first signal, called the calibration signal, including a wave train of multiple frequencies, the spectral density associated with each frequency being identical; receiving the response of the electrochemical system to the calibration signal; determining, on the basis of the received response and for each frequency of the calibration signal, a signal attenuation factor; determining, for each attenuation factor, a correction factor according to the attenuation factor so as to associate a correction factor with each frequency of the calibration signal; and determining the probe signal, the probe signal being obtained by multiplying the spectral density associated with each frequency of the calibration signal by the correction factor corresponding to the frequency in question.

The present invention relates to a short-sequence acoustic wave generating component and a wave train measuring instrument, comprising a power supply unit, an excitation unit, an acoustic wave transmitting unit and an energy recovery unit; the acoustic wave transmitting unit includes a transmitting sensor X1; the input end of the excitation unit is connected to the power supply unit, and the output end is connected to the transmitting sensor, and is used for exciting the transmitting sensor to vibrate so as to transmit acoustic waves; the energy recovery unit is connected to the transmitting sensor and is used for consuming the electric energy stored in the transmitting sensor during the vibration of the transmitting sensor; by setting the energy recovery unit, the energy stored in the transmitting sensor is recovered in the positive half-cycle and / or negative half-cycle of the vibration of the transmitting sensor by consuming electric energy, forcing the acoustic wave transmitting sensor to quickly stop vibrating, so that the wave train length of the acoustic waves emitted by the transmitting sensor is greatly shortened, avoiding the overlap of the latter arrival wave and the latter half of the first arrival wave, and improving the measurement effect of the full wave train measurement of acoustic waves.

The invention discloses a double-emission-source delay time calculation method and device, equipment and a medium, and the method comprises the steps: firstly, setting that only a far emission source works, obtaining a first wave train of a casing wave excited by the far emission source and received by a first receiver, and obtaining a second wave train of the casing wave excited by the far emission source and received by a second receiver; then calculating a first moment when the head wave in the first wave train arrives and a second moment when the head wave in the second wave train arrives, and then obtaining a third wave train of the casing wave excited by the near-emission source and received by the first receiver and a fourth wave train of the casing wave excited by the near-emission source and received by the second receiver; and calculating a third moment when the head wave in the third wave train arrives and a fourth moment when the head wave in the fourth wave train arrives, thereby calculating the delay time of the double emission sources. The time difference between the head waves of the casing waves excited by the far emission source and the near emission source and the receiver is used as the emission delay time, so that the calculation complexity of the delay time of the double emission sources is effectively reduced.

The technical scheme is combined with an improved time reversal method to provide a wave train reproduction method based on an SPH numerical pool, the numerical wave pool based on the SPH method is constructed, the target wave train is subjected to time reversal and then is subjected to fast Fourier transform to obtain a first-time wave generation signal, the first-time wave generation signal is used for generating waves in the numerical pool, and the first-time wave generation signal and the second-time wave generation signal are used for generating waves in the numerical pool. The method comprises the following steps: recording at a specified position of a numerical pool to obtain a wave time calendar of first-time wave generation, carrying out time reversal on the wave time calendar recorded at the specified position of the numerical pool after the first-time wave generation, generating a second-time wave generation signal by using a reversed wave train, and introducing the second-time wave generation signal into the numerical pool to carry out second-time wave generation, the reproduced target wave train is recorded at the specified position of the numerical pool, the problem that the wave phase and amplitude cannot be accurately controlled when the SPH method is used for simulating the wave train is solved, and accurate simulation of the deterministic wave train can be achieved.

The invention relates to the technical field of ultrasonic detection, in particular to a method for eliminating an error of a curve measured by an ultrasonic rebound comprehensive method. The method comprises the following steps: acquiring actually measured data of an arch bottom measuring area and an arch top measuring area; further acquiring an environment difference index according to the high-frequency difference, the sound velocity value difference and the rebound value difference of the ultrasonic full-wave train signals of the two measurement areas; according to the difference between the sound velocity values of the two measuring areas and the sound velocity value of the standard model and the difference between the rebound value of the two measuring areas and the rebound value of the standard model, the distribution of environmental difference indexes is combined, and a current weighted fitting deviation coefficient is obtained; and finally, selecting the final compressive strength from the preset trial calculation set based on the weighted fitting deviation coefficient. According to the method, the environment difference index is constructed through the sound velocity, the rebound and the high-frequency transmission coefficient of the arch crown / arch bottom measuring area, the fitting deviation of the trial strength is subjected to asymmetric weighting, water-induced sound velocity virtual high is automatically exempted, abnormal rebound is blocked, and therefore the real compressive strength is decoupled under lossless blind measurement.

The present invention provides an energy distribution system for generating freak waves in a laboratory sink, belonging to the technical field of ocean engineering. The wave generation system includes a first determination module, an equal division module, and a second determination module. The first determination module is configured to receive a target spectrum selected by a user and determine its frequency spectrum range, and determine the maximum wave number and the minimum wave number within the frequency spectrum range according to the calculation relationship between the frequency spectrum range and the wave number. The equal division module is used to equally divide the maximum wave number and the minimum wave number into 0 wave trains. The energy distribution method of the equal division wave number method proposed by the present invention has a stronger multi-wave resonance effect in different wave spectra, can generate freak waves with larger wave amplitudes and faster propagation speeds, and can provide better reference significance for generating extreme freak waves in the laboratory.

The invention relates to the technical field of pile foundation detection, and particularly discloses a static drill rooted bamboo joint pile and precast pile integrity tube wave detection device and method.The device comprises a detection mechanism, a measuring hammer and a detection hole, the detection mechanism comprises a signal collector, and the signal collector is connected with a plurality of hydrophones through cables; a distance regulator is arranged between two adjacent hydrophones; the measuring hammer is used for knocking the top of the pile body to generate stress waves spreading downwards along the pile body. The detection hole is formed in the pile body, and the detection mechanism detects the pile body through the detection hole. The detection hole is filled with water as a medium for signal propagation, the pile top is knocked by the measuring hammer to excite tube waves in water in the detection hole, the tube waves propagated in the axial direction of the detection hole can be reflected and transmitted at positions such as a pile body wave impedance difference interface, a liquid level and a hole bottom, and sound pressure in water at different depths is received by the hydrophone; and according to the wave train diagram, pile body integrity and defect positions are analyzed, and the accuracy and reliability of foundation pile integrity detection are improved.

An array substrate and a display panel, which relate to the technical field of flexible displays and are used for solving the problem of the Newton's ring phenomenon due to unequal spacing between transparent layers affects the display effect of the display panel. The array substrate or a display panel include at least two transparent layers stacked in sequence, and a light adjusting layer arranged between at least two adjacent transparent layers, where a product of a refractive index of the light adjusting layer and a thickness of the light adjusting layer is greater than one half of a preset wave train length.

TITLE: Device and method for very precise pointing of a decoy source. Device for very precise pointing of a decoy source comprising one or more galaxies of geolocation satellites regularly emitting, for each satellite, a wave train, three GNSS antennas arranged more than one meter apart, said antennas forming a planar triangle, the three heights of said triangle each having a length greater than one meter, said three antennas being positioned on the aircraft in such a way that they receive the signals emitted by the geolocation satellites, a means of comparing, for each selected satellite and at each instant, the time difference values ​​allowing to determine, if these time difference values ​​are respectively substantially equal to a predetermined value, greater than a few tens of nanoseconds,and in this case to determine that the signals sent by this satellite are not spoofed, and that otherwise the signals sent by this satellite are spoofed, a calculation method allowing precise targeting of the spoofing satellite, in the case where the method has determined that the selected satellite is spoofed, by constructing a trihedron with the antennas as its base and a point as its vertex indicating the direction of the spoofing satellite. Figure for the abbreviation: Figure 1,

The invention provides a complex columnar structure medium inversion method based on a high-order bending wave cut-off frequency, and the method comprises the steps: building a slurry-sleeve-cement sheath-stratum multilayer medium coupling model based on a three-dimensional elastic waveguide theory; calculating the cut-off frequency of the bending mode wave of the dipole high-order bushing according to the sizes of the inner-layer bushing and the outer-layer bushing; exciting an elastic wave field by using a piezoelectric transducer, and continuously collecting full-wave array acoustic wave signals along the well axis direction; performing Fourier transform on the full-wave train sound wave signal to obtain a frequency spectrum, and calculating frequency dispersion data of the full-wave train sound wave signal by using a frequency spectrum correlation function; according to the frequency dispersion data, summing the slowness data at each frequency in a cut-off frequency range to obtain a frequency coefficient; and correcting the calculated frequency coefficient to obtain a correction coefficient, and normalizing the obtained correction coefficient to obtain the cementation index of the whole well section. According to the method, tedious theoretical frequency dispersion curve solving is avoided, and the method is simpler and more efficient.

This invention discloses a wave generation control method and apparatus for wave generators deployed at both ends in a wave testing tank. First, the target positions and target angular frequencies of two wave trains are determined based on the target function, which can be wave attenuation, bidirectional wave generation, or focused wave generation. Then, the propagation times of the two wave trains are calculated respectively. Based on the propagation times, the target activation time of the corresponding wave generator is determined. Finally, the corresponding wave generator is activated at the target activation time, generating the corresponding waves based on the target wave height and target angular frequency. In this invention, each end of the wave generators deployed at both ends can independently control wave generation at each end. Based on the synergistic effect of the wave generators deployed at both ends, wave propagation and superposition are controlled, accurately generating focused waves and simulating the effect of concentrated waves on marine structures.

An electric motor contains a motor shaft which is arranged in a motor housing. The motor shaft is rotatably mounted about a rotational axis in at least one rolling or ball bearing, which sits in a bearing receiving area and contains an outer ring and an inner ring fixed to the motor shaft. The outer ring of the rolling bearing is pretensioned by a spring disc which sits in the bearing receiving area and has a number of wave trains with alternatingly axially projecting half wave trains, and the spring disc has a number of centering elements on the inner circumference. The centering elements rest against the motor shaft when the spring disc is untensioned and is arranged at a distance to the motor shaft when the spring disc is tensioned.

Separating target particles from discard particles in an aggregate using tailored frequencies in a mineral separation table is described. The separation table comprises a planar surface angled in a −z direction along the +x axis at an angle α and in the −z direction along the +y axis at an angle β. A motor is responsive to a first or second vibration wave train received by a controller. The motor vibrates the table with the vibration wave train thereby separating target from discard particles by differences in specific gravity. The first vibration wave train is a plurality of primary half sine waves each followed by a pause. The second vibration wave train is the plurality of the primary half sine waves and a plurality of high frequency sine waves having a frequency that is higher than the primary half sine wave.

The application belongs to the field of wireless communication, and relates to a 5G millimeter wave train-ground wireless communication switching method, device and computer equipment. The method comprises the following steps: predicting a future trajectory of a train and a signal change trend based on multi-source information fusion, forming a prediction baseline, and generating initial switching strategy parameters; periodically acquiring a real physical state at a current time before a switching correction time limit, comparing the real physical state with the prediction baseline in real time, and calculating a deviation amount; diagnosing whether the current real-time situation and the predicted wireless propagation law are consistent, thereby evaluating the credibility of the initial prediction, and obtaining a diagnosis result; according to the diagnosis result, corresponding decision branches are executed, and final switching control parameters are generated online; link switching of a physical layer and a protocol layer is completed, and real-time confirmation is performed; switching process data is collected, switching performance is evaluated, and iterative updating of channel characteristic parameters is driven. Precise prediction and intelligent decision can be performed, efficient link switching can be performed, and continuous optimization and performance improvement can be realized.

The application discloses a turbine rotating-static spacing design method for inhibiting wave system interference, and the method comprises the following steps: obtaining turbine overall design input parameters; establishing a rotating-static axial spacing quantitative calculation model based on the input parameters; satisfying supersonic airflow local blockage conditions; and inhibiting wave system interference through induced shock waves. The optimal spacing is calculated by using the model, so that the rotor blade is swept by three times of extended, reflected and induced shock waves when passing through the guide vane channel, and aerodynamic excitation spectrum is widely distributed. The spacing is output to the turbine stage axial layout design. The application optimizes the axial distance between the rotor blade and the stator guide vane, directly reduces the turbine stage axial size, and through the accurate control of the axial spacing, the rotor blade is swept by three times of extended, reflected and induced shock waves when passing through the guide vane channel, the wide distribution of the aerodynamic excitation energy spectrum is realized, and the aerodynamic excitation on the turbine rotor blade is significantly reduced.

The present application belongs to the technical field of development of marine natural gas hydrate reservoirs, and relates to a method for simulating and testing acoustic detection of a fractured crack in a natural gas hydrate reservoir. The present application processes array full-wave train logging data of a hydrate reservoir fractured crack-wellbore model to obtain a Stoneley wave signal, and then performs empirical mode decomposition and Hilbert-Huang transformation to construct cumulative Hilbert energy. The acoustic attenuation coefficient of the Stoneley wave signal and the inverse of the cumulative Hilbert energy are combined as a crack sensitive parameter to determine a predicted crack height. In view of the particularity of the complex acoustic characteristics of a natural gas hydrate reservoir, the present application solves the problem that the acoustic detection method cannot accurately characterize the acoustic response of a crack in a hydrate-containing fractured crack model, and provides guidance for detection and interpretation of a hydraulic fractured crack in a marine natural gas hydrate reservoir.

A display panel, which includes: a substrate; a light-emitting element layer disposed on the substrate, including a plurality of light-emitting elements; an encapsulation layer disposed on one side of the light-emitting element layer away from the substrate; and a light energy adjustment layer disposed between the light-emitting element layer and the encapsulation layer, the light energy adjustment layer being capable of converting each wave train of light passing through it into a wave packet. Characteristic length of the wave packet is less than length of the wave train.

The invention discloses a multi-array-element ultrasonic focusing method and system for nerve regulation, and the system comprises a control module which is used for designing a user interaction interface based on an embedded system and an FPGA, and setting a phased array algorithm to control the ultrasonic intensity and phase of each channel; the power transmitting module comprises an array circuit which takes a special radio frequency power amplifier as a main body and is used for completing ultrasonic wave column transmission of each channel; the echo signal receiving and processing module is used for analyzing and judging the intensity of the sound echo after filtering the echo in a specified time window; and the array probe module comprises a power transmitting piezoelectric ceramic transducer and a receiving transducer and is used for transmitting and receiving ultrasonic waves. According to the scheme, the working parameters, with the strongest echo, of the transmitting unit are obtained through the iterative algorithm, it can be guaranteed that transcranial post-ultrasound is focused at the original focus, and sound field distortion caused by the skull is overcome.

The invention discloses a TBCC air inlet channel external pressure section air inlet channel design method and system based on the optimal wave system design theory, and belongs to the technical field of turbine-based combined cycle air inlet channels. For the external pressure section of the binary stamping air inlet channel, the optimal wave system design theory is utilized to meet the requirement for compression efficiency, the requirement for low total pressure loss and the requirement for flow of the air inlet channel; zero-dimensional design is adopted, the design of an external pressure section is carried out by a non-stick shock wave relational expression, and correction of a boundary layer is assisted. The method is used for solving the problems that in the prior art, at a non-design point, a shock wave system structure may deteriorate, so that the total pressure of an air inlet channel is recovered and suddenly reduced, flow capture is insufficient, and even starting failure is caused, and the problem that when the Mach number is high, the performance is poor due to insufficient compression or too large shock wave loss is possibly solved.

A non-resonance alternative to modulated carrier wave radio provides narrowband, 1 mbit per second digital radio communication in the short wave bands and faster communication at higher frequencies. Modulated carrier techniques such as AM, FM, PSK, and ASK are limited by resonation and hysteresis transients, which distort the leading cycles and ending cycles in a communication wave train, causing delays. This necessitates a long wave train to encode each signal change. These limitations were minimized by removing resonance from the transmission signal path, and by using zero signal crossing for transmission and receiver detection. The transmitter has multiple class A amplifier stages connected directly to a non-resonant antenna. The digital carrier transmitter provides high data rates by eschewing modulation and resonance circuitry.

The application provides a method and system for calculating the electromagnetic scattering coefficient of a sea surface under the action of a two-dimensional flow field, comprising the following steps: step 1, setting a sea surface area to be observed, setting flow field and wind field data, and setting radar parameters; step 2, setting relevant parameters in a wave-current interaction model, and establishing a wave action spectrum conservation equation according to the wave-current interaction model; step 3, solving the wave action spectrum conservation equation by using a ray tracing method to obtain a new wave action spectrum of a wave train after the wave train is modulated by the flow field; step 4, converting the new wave action spectrum obtained in step 3 into a wave height spectrum, and calculating sea level related information including the root mean square height and the local incidence angle of each point by using the wave height spectrum; and step 5, inputting the calculated sea surface information and the set radar parameters into an IEM electromagnetic scattering model to calculate the modulated backscattering coefficient. The flow field modulation model based on the IEM model can effectively calculate the electromagnetic scattering of the sea surface under the modulation of the two-dimensional flow field.

The invention discloses a spring rainfall prediction method based on atmospheric circulation abnormal signals. The method comprises the following steps: S1, obtaining and preprocessing multi-source data; s2, key circulation system identification and signal extraction; s3, construction of a synergistic effect index: constructing a circulating current synergistic effect index for comprehensively representing the configuration states of the plurality of circulating current systems in the specific region based on the circulating current signals extracted in the S2; s4, establishing a rainfall prediction model; and S5, testing a prediction result and integrating services. According to the method, abnormal signals of a plurality of key circulation systems including arctic oscillation and remote correlation wave train thereof, a south branch groove, subtropical high pressure, a water vapor transfer channel and a cold air activity path are systematically identified and quantified from multi-source data, so that the problems of high dependence on a single factor and incomplete physical mechanism of a traditional method are solved; and a comprehensive and three-dimensional circulation background support is provided for prediction.

This invention discloses a method, apparatus, and electronic device for inverting landslide surge wave height based on distributed optical fiber sensing. The method includes: acquiring the raw time-series signal collected by an optical fiber sensing array and performing adaptive denoising processing; separating high-frequency landslide vibration and low-frequency surge components using time-frequency analysis technology to construct a spatiotemporal evolution spectrum; accurately determining landslide surge events based on the distinct trajectory slope characteristics exhibited in the spectrum due to the significant difference in propagation speed between the two components; constructing a frequency-domain phase-pressure conversion model, introducing a frequency-dependent correction factor to restore the true surge pressure spectrum, and determining landslide deformation correction coefficients based on wave train superposition characteristics to compensate for energy dissipation; and finally, combining the above factors and coefficients to invert and obtain the corrected landslide surge wave height. This invention effectively solves the problems of difficult signal identification and insufficient inversion accuracy in complex water areas through physical field decoupling and a dual correction mechanism, achieving high-precision quantitative monitoring of the entire landslide surge process.

The invention discloses a light cement well cementation formation wave signal processing method and system based on sound wave variable density logging, and the method comprises the steps: carrying out the logging based on a sound wave variable density cement cementing instrument, and obtaining CBL / VDL logging data; according to the well body structure, a light cement well cementation well section is determined; fourier transform is carried out on the 5-foot full wave train of the light cement well cementation well section, and a frequency domain waveform is obtained; filtering the transformed frequency domain waveform frequency spectrum to filter casing wave components; and performing Fourier inversion on the filtered frequency spectrum to obtain a time domain waveform, and performing variable density processing on a time domain wave train after Fourier inversion to obtain a processed CBL / VDL evaluation graph. According to the method, the problem of accurate evaluation of the light cement well cementation quality is solved, and well logging engineering information capable of truly reflecting the light cement well cementation quality is ensured to be obtained.

This application provides a waveform processing method and electronic device for numerical simulation of acoustic variable density logging, belonging to the field of numerical simulation technology. The method includes: obtaining an engineering value of the acoustic amplitude based on the calculated acoustic amplitude waveform; calculating the cement bonding index based on the engineering value of the acoustic amplitude; simulating the cement bonding index waveform based on the cement bonding index; and when the positive peak amplitude is greater than a preset threshold, using a numerical simulation waveform processing algorithm to extract the positive peak from the wave train of the cement bonding index waveform, performing variable density map processing, and obtaining a forward-modeled acoustic amplitude variable density map. This application's solution can quantitatively determine the degree of cement bonding based on the cement bonding index and intuitively evaluate the cementing quality based on the forward-modeled acoustic amplitude variable density map.

The invention discloses a system and method for evaluating the geometrical shape of a downhole casing, and the system comprises a signal detection device which is used for detecting ultrasonic pulse full-wave train signals at different depths, the ultrasonic pulse full wave train signal comprises a first guided wave signal which is propagated along the axial direction of the casing, casing inner wall reflection echo signals in different directions, a second guided wave signal which resonates along the thickness of the casing, and a fluid characteristic reflection signal; the signal acquisition device is used for acquiring ultrasonic pulse full-wave train signals and generating acquisition data of corresponding signal types; the signal processing device is used for calculating the inner diameters and the thicknesses of the casing pipes in different directions according to the collected data; and the post-processing device is used for fitting the geometrical shape of the casing pipe of the whole well section according to the inner diameter and the thickness of the casing pipe in different directions under different depths.

The invention provides a method and a device for polarization modulation of electromagnetic waves. For polarization modulation of electromagnetic waves, in particular for generating keys for quantum cryptography, two counter-propagating, polarized electromagnetic waves, namely a first wave train (19) and a second wave train (20), are phase-modulated relative to one another by at least one RF field of a running-wave phase modulator (16) co-propagating with one of the two electromagnetic waves.

Method for aligning the shaft train of a hydroelectric power plant, which includes the following steps: S1: The wave train is set into rotational motion; S2: While the shaft train rotates, the signals generated by the vibration sensors (3.1, 3.2) and the angle encoder (4) are continuously recorded by the control unit (9); S3: Evaluation of the continuously recorded signals with regard to a complete rotation of the wave train by the control unit (9); S4: Output of at least one message by the control unit (9); S5: Stopping the rotation of the shaft train; S6: If necessary, implement a corrective action.