18 results about "Wave train" patented technology

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.

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.

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,

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.

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.

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.

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.

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.

The application relates to a pile single-hole seismic wave imaging detection method and device, and relates to the field of engineering measurement, which comprises the following steps: S1, after a detection sensor is lowered, a coupling fluid is filled in an acoustic pipe; S2, vertical excitation is applied on a pile top, so that a seismic wave signal is excited in pile concrete; S3, a detection sensor receives a Stoneley wave signal generated by the coupling effect of the seismic wave on the interface of a pile defect and the fluid in the acoustic pipe; S4, a depth-time wave train is generated according to the Stoneley wave signal; and S5, an eight-character feature in the wave train is identified to judge and position the pile defect. The application has the effect of improving detection efficiency.

The application discloses a method, a system, a storage medium and equipment for detecting polarity reversal of acoustic logging, and particularly relates to a method for detecting polarity reversal of acoustic logging of a quadrupole wave train containing collected orthogonal dipole four-component wave trains, collecting orthogonal dipole four-component wave train data, processing the data, calculating a range of wave train data to be analyzed, calculating and detecting whether YY component wave trains are reversed, normalizing wave trains of other three components based on the YY component wave trains, summing the YY component wave trains and the other three components, comparing absolute values, and determining polarity reversal when the cumulative sum of absolute values is less than 2 / 3 of the number of absolute values of two components participating in summation, thereby realizing detection and correction of polarity reversal of the four-component wave trains, ensuring that subsequent processing results of inversion of formation anisotropy, wellbore scanning reflection wave imaging and the like using the dipole four-component wave trains are reasonable, and solving the problem of false images of great formation anisotropy or abnormal data of azimuthal imaging wave train synthesis.