1631 results about "Transverse wave" patented technology

This invention relates to a device which is either permanently attached or removable to the edge of a material such as a vehicular glass window. This device may be comprised of a converter sub-unit (vibrator) and an amplifying coupler. These elements are arranged so as to propagate mechanical motion generated by the converter sub-unit through the amplifying coupler and into the edge of the attached material. The resulting vibration motion in the material, which could take the form of a longitudinal compression / rarefaction wave, transverse wave, or a combination of the two waveforms, is of a sufficient magnitude so as to cause the adhesive bond between the material's surface and other solid debris, such as ice, to be quickly broken. This allows the debris to fall away while not damaging the material. The vibration motion in the material is also of sufficient magnitude to remove a liquid such as water from the material surface.

A transcutaneous electrical nerve stimulation device for treating a user's lower back pain or discomfort is provided. The inventive device comprises a stimulation pad with an array of electrodes therein. A controller communicates with the electrodes to energize / de-energize them in a patterned, sequential manner. The patterned actuation of the electrodes in a sequential fashion provides electrical impulses to the patient's skin, simulating a transverse wave motion. The transverse wave motion simulation provides the user with the effect of the electrical stimulation combined with the mechanical tissue stimulation received in traditional massage therapy, resulting in improved pain and discomfort relief. The device may use programs stored in the controller. Alternatively, the user may manually actuate one or more electrodes as well as manually move the electrode actuation to concentrate on a specific lower back region using an electrostatic touch pad or the equivalent. The user may also use voice commands to access the stored programs, move the electrode stimulation region, change the electrode actuation intensity and / or dwell time. The device may store the user's manually-generated routines for repeating when desired. A visual display may provide feedback to the user regarding the electrode actuation position and pattern.

A noise suppression method of a wave filter used to eliminate standing wave signal interferences in the acoustic wave filter consisted by a plurality of film bulk acoustic resonators (FBARs). The method is to provide a plurality of scatterers in the structured consisted by the FBARs, thereby creating an band-gap structure due to the material characteristics difference, which consequently generates a destructive interfering effect to the transverse higher harmonics vibration within a specific operating frequency range, and ultimately decreases or even eliminates any parasitic effects. Therefore, within the operation frequency range of this band-gap structure, abnormal signals created by any transverse wave modes cannot exist. In addition, an acoustic shield can be provided by phononic crystal structures between different FBARs, thus acoustic shielding any mutual interference within the operation frequency range.

The present invention relates to a shale gas reservoir crustal stress logging prediction method based on a rock physics model. According to the method, a shale gas reservoir rock physics model which takes kerogen particles into consideration is established, so as to predict a longitudinal and transverse wave velocity of the logging; based on the above, a maximum and minimum horizontal principal stress and a fracture pressure of the reservoir are calculated; and an accurate stress assessment of a shale gas reservoir is carried out while a transverse wave logging is not provided. The beneficial effects of the invention are that: the rock physics model in line with characteristics of the shale gas reservoir is established to improve precision of the prediction velocity; and based on the rock physical model, the maximum and minimum horizontal principal stress and the fracture pressure are obtained, so that while the measured transverse wave logging data are not provided, the underground stress can be predicted on the basis of a conventional logging curve, and the prediction result is high in accuracy.

The invention provides a method and a device for synchronous measurements on dynamic and static elastic parameters of rocks by using a rock triaxial anti-compression testing device. The method comprises: sealing a test rock sample in a triaxial autoclave filled with hydraulic oil, applying an oil pressure by an axial pressure control system, applying a confining pressure by a confining pressure control system, and applying a pore pressure by a pore pressure control system; acquiring propagation speeds of longitudinal waves and transverse waves in the test rock sample by a computer acquisition and control system, and calculating the dynamic Young modulus and the dynamic Poisson ratio according to the propagation speeds; and acquiring deformation parameters of the test rock sample during a loading process by the computer acquisition and control system, and calculating the static Young modulus and the static Poisson ratio according to the deformation parameters. The method and the device can ensure validity and accuracy of hydrocarbon reservoir rock mechanical parameter measurements in thousands of meters deep underground and under the conditions of complex confining pressure, high temperature, high pore pressure and polyphase fluid.

A communication device includes a communication circuit unit that processes a high frequency signal which transmits data, a high frequency signal transmission path that is connected to the communication circuit unit, a high frequency coupler that receives the high frequency signal and radiates an induction electric field signal of a longitudinal wave, and an antenna that receives the high frequency signal and radiates a radiation electromagnetic field or an electric wave signal of a transverse wave.

The invention discloses a method for detecting ferrous magnetic material thickness by utilizing electromagnetic ultrasound, and is characterized in that a magnet inside an electromagnetic ultrasound transducer takes a U-shaped permanent magnet, a coil takes a PCB double-layer coil that takes the shape of a Chinese character, 'Hui' and is positioned at an opening of the permanent magnet, and an effective lead part of the coil is parallel to the direction of a bias magnetic field. In thickness measurement, the electromagnetic ultrasound transducer is positioned on a detected object, high-frequency electric sinusoidal pulse current passes through the coil, according to the magnetostrictive effect, the detected object generates partial stretching deformation and oscillation, and consequently excites ultrasonic transverse wave and leads the ultrasonic transverse wave to spread downwards in a direction vertical to surfaces of the detected object. The ultrasonic wave is reflected by a lower surface of the detected object, and then the reflected wave is received by the coil. A received ultrasonic signal is collected and input into a computer after being amplified. If the ultrasonic wave spreading velocity in the detected object is v, and the spreading time is t, then the thickness of the detected object d is equal to a half of v multiplied by t. The method for detecting ferrous magnetic material thickness by realizing the thickness detection of ferrous magnetic materials, has the non-contact and couplant-free advantages, and can be used in high-temperature environment and for detecting materials with rough surfaces.

The invention discloses an elastic reverse time migration imaging method by combining seismic multi-component and belongs to the field of exploration geophysics. The method comprises the following steps: directly inputting seismic multi-component data; without performing the wave field separation on the input data, extrapolating forwards at inverse time based on an elastic wave equation; building an underground elastic vector seismic wave field by combining with multi-component; acquiring four elastic wave imaging results having specific physical significance, such as longitudinal wave, transverse wave, transition longitudinal wave and transition transverse wave, by applying an elastic wave cross-correlation imaging condition of lighting compensation; and suppressing the low wave number noise in the elastic reverse time migration by performing low-pass angle filtering, thereby acquiring an imaging result of final elastic wave migration. By directly inputting the seismic multi-component data and building the underground elastic vector seismic wave field by combining with multi-component, the method can be used for accurately imaging for complex earth medium.

A boundary acoustic wave device efficiently traps the vibrational energy of boundary acoustic waves and exhibits a high electromechanical coupling coefficient, and is consequently not affected by higher-order modes. The boundary acoustic wave device includes a first medium having piezoelectric characteristics, a non-electroconductive second medium, and a third medium through which slow transverse waves propagate at a lower acoustic velocity than slow transverse waves propagating through the first and second media. The first medium, the third medium, and the second medium are stacked in that order. An IDT is disposed between the first medium and the third medium. The IDT includes a metal layer made of a metal having a density ρ in the range of about 3000 kg / m3 to about 21500 kg / m3. The IDT has electrode fingers arranged at a pitch of λ and has a thickness H1 satisfying the relationship 0.006λ≦H1≦0.2λ, and the third medium has a thickness H2 satisfying the relationship H1<H2≦0.7λ.

A rock breaking seismic source and active source three-dimensional seismic combined detection system uses a tunnel boring machine for three-dimensional seismic combined detection by active seismic source and rock breaking seismic source methods. Long-distance advanced prediction and position recognition of a geological anomalous body are realized using the active source seismic method. Machine construction is adjusted and optimized according to the detection result; real-time short-distance accurate prediction of the body is realized using the cutter head rock breaking vibration having weak energy but containing a high proportion of transverse wave components as seismic sources and adopting an unconventional rock breaking seismic source seism recording and handling method. An area surrounding rock quality to be excavated is represented and assessed. A comprehensive judgment is made to the geological condition in front of the working face with the results of active source and rock breaking seismic source three-dimensional seismic advanced detection.

The invention discloses a method and a device for analyzing the dispersion and attenuation of unsaturated double-porosity medium earthquake waves. The method comprises the following steps of: 1, acquiring geological data including penetration rate, porosity, shale content and mineral components and generating a reservoir rock dry framework model according to the geological data; 2, acquiring measured data including drilling data, logging data, logging information and fluid experiment measured data and generating a reservoir fluid model according to the measured data and a Van derWaals equation; 3, solving plane waves according to the reservoir rock dry framework model, the reservoir fluid model and a Biot-Rayleigh equation for describing the spread of the unsaturated double-porosity medium earthquake waves, and generating phase speed and inverse quality factors of longitudinal waves and horizontal waves; and 4, generating relationships between frequency and each of speed, attenuation,wave impedance, AVO (Amplitude Versus Offset) response characteristic and the like according to the phase speed and inverse quality factors of the longitudinal waves and the horizontal waves.

The invention discloses a method suitable for positioning a hydraulic fracturing micro-seismic source. The method includes: building a micro-seismic-monitoring observation system, acquiring logging information and other seismic data, building an initial speed model, researching and analyzing regional stratum conditions and perforation records, determining background interference and micro-seismic signal features, performing noise compression on fracturing records and performing effective waveform identification on micro-seismic signals, and using methods such as first break picking and manual intervention to pick the first break travel time of a direct wave, wherein the travel time of the perforation records is used for optimizing the speed model, and other effective events are used for the inversion positioning of the seismic source. The method has the advantages that transverse wave travel time is added on the basis that longitudinal wave travel time is used, the micro-seismic source is positioned by using the longitudinal wave travel time and the transverse wave travel time to perform simultaneous constraining, the inversion uses a method combining global searching and local searching, and the method is high in positioning precision and high in calculation efficiency.

The invention embodiment discloses a method for shear wave field formation and an ultrasonic image system. The system receives an indication of a region of interest and selects a shear wave front shape. The system also selects, based on the selected shear wave front shape, focus locations for a plurality of push pulses and a sequence for moving a shear wave source among the focus locations. The system transmits a series of push pulses according to the selected sequence, and determines a speed of the shear wave front as it passes through the region of interest. Changes in the speed of the shear wave front are related to changes in stiffness within the tissue.

The invention relates to the processing of petroleum geophysical exploration data, in particular to a method for comparing and demarcating seismic data positions. The method comprises the following steps: carrying out pre-stack AVO processing on longitudinal wave data after data spectrum equalization to ensure that a difference attribute C and the frequency band of post-stack data of a P-SV converted wave are equivalent; carrying out large control position collection by utilizing the attribute C and the post-stack data of the P-SV converted wave processed by wavelet consistency to obtain a variation tendency of the ratio of a longitudinal wave velocity and a transverse wave velocity in a work area; scanning a sliding time window velocity ratio of the attribute C and the post-stack data of the P-SV converted wave; determining a velocity ratio on a velocity ratio spectrum; and compressing the time of the P-SV converted wave data to a longitudinal wave time scale to finish the position comparison. The invention does not need priori information restriction, avoids difficulty of position collection caused by a conventional method and can obtain a high-precision velocity ratio.

The invention provides a shale anisotropic rock physical modeling method, and belongs to the field of rock physical study. The method comprises the following steps of: (1) calculating the elasticity modulus of mixed mineral; (2) combining an anisotropic self-consistent model and an anisotropic differential effective medium model for calculating the effective elasticity modulus of clay and fluid compounds; and (3) mixing the clay and fluid compounds, seams between layers and mineral components; calculating the effective elastic parameters of saturated rocks; solving the longitudinal wave velocity and the transverse wave velocity of equivalent anisotropic media; and completing the modeling. The method has the advantages that the shale anisotropic rock physical modeling method can be applied to shale longitudinal and transverse wave velocity prediction; the calculation precision is superior to that of an isotropous effective medium model, and the elasticity features of the rocks are more accurately described.

The invention relates to a method for imaging an anisotropic medium through utilization of vertical seismic profile data. The method comprises the following steps: firstly, establishing an initial depth-speed model; secondly, establishing an initial speed model through utilization of an interval velocity and an anisotropic coefficient of a Walkaway VSP or three-dimensional VSP first-arrival time inversion model; converting a plane of random normal direction of a three-dimensional space into a plane with normal parallel to the Z axis; loading information of an observation system; determining a reflecting layer of which rays run through from a shooting point to a receiving point; seeking an approximate ray parameter; determining a coordinate of the reflecting point in a reflecting interface and recording the corresponding sequence number of the receiving point; determining the traveling time from the reflecting point to the receiving point and an emergence angle of the ray in the reflecting point; and outputting imaging gather data. The method simplifies calculation, has high operation efficiency, improves the precision and the resolution of the VSP imaging result and can conveniently carry out migration imaging on Walkaway VSP or three-dimensional VSP vertical wave, transverse wave or converted wave data.

A P-wave slowness-polarization data set resolving P-wave slowness against P-wave polarization angle is extracted from a multi-offset vertical seismic profiling data set. A function relating P-wave polarization angle to P-wave slowness, and being dependent on at least three free parameters, wherein in at least two of these free parameters information of shear wave velocity is absorbed together with one or more anisotropy parameters that characterize formation anisotropy is selected, and regression values found for the at least three free parameters by fitting the selected function to the P-wave slowness-polarization data set, The regression values may be utilized in a method of producing a mineral hydrocarbon fluid from an earth formation.

The invention relates to a multi-component converted wave static correction method by using surface waves, which comprises a step of solving stratigraphic classification and transverse wave velocity of a superficial layer through the extraction of the surface waves and the inversion of frequency dispersion curves based on Rayleigh surface waves in a shot record, so as to accurately calculate static correction quantity of detection points of converted waves. The test processing on two-dimensional three-component of a certain block in Daqing shows that a transverse velocity non-uniform body of the superficial layer generates a larger static correction time difference; and the processing on three-dimensional three-component data of a certain coal mine in Huainan shows that the static correction time difference of over 20 milliseconds can also occur due to the low and transversely non-uniform transverse wave velocity even in a flat plain terrain, and for a coalfield high-resolution seismic exploration to recognize minor faults of about 3 meters, the static correction time difference is a non-ignorable error. Application tests in three-component seismic data processing in two regions achieve a better processing effect and prove that the multi-component converted wave static correction method by using the surface waves is a feasible method.

The invention discloses a method and device for determining formation pressure. The method includes the steps that amplitude preservation processing is carried out on longitudinal wave PP and converted wave PS seismic data so that superposition data of multiple portions can be obtained, and a longitudinal wave impedance body, a transverse wave impedance body and a density body are obtained in a pre-stack PP and PS joint simultaneous inversion method according to logging information; the longitudinal wave impedance body, the transverse wave impedance body and the density body are converted into depth domains; pressure of overlying strata is calculated according to the density body; effective stress of a framework is calculated according to the longitudinal wave impedance body, the transverse wave impedance body and the density body; the formation pressure is calculated according to the pressure of the overlying strata and the effective stress of the framework. Precision of formation pressure seism prediction can be improved.

The invention belongs to the field of exploration earth physics and specifically relates to an elastic vector reverse time migration imaging method. According to the invention, multi-component seismic data is used as input, an elastic wave propagation operator is utilized to carry out wave field prolongation, an elastic vector seismic wave field is constructed; and a decoupling prolongation equation method is utilized to obtain longitudinal and transverse wave fields of decoupling; vector points of the longitudinal and transverse wave fields with seismic source illumination compensation are utilized to construct elastic wave cross-correlation imaging conditions, and a multi-component seismic data elastic vector reverse time migration imaging result is obtained; and low-frequency noise suppression is carried out on the imaging result, and a final elastic vector reverse time migration imaging result is obtained. The elastic vector reverse time migration imaging method solves the scalar imaging problem of the longitudinal and transverse wave fields, and the imaging precision of elastic reverse time migration under a complex construction is improved.

An ultrasonic tester of the fastening force for screw bolt is composed of longitudinal wave transducer connected serially to ultrasonic emitter, longitudinal wave receiver and amplifer, transverse wave transducer connected serially to ultrasonic emitter, transverse wave receiver and amplifier, displacement sensor connected serially with thickness measuring circuit, A / D converter and DSP, temp sensor connected serially to temp measuring circuit, A / D converter and DSP, main oscillator, time pulse generator, and ROM. Its feature is use of sono-elasticity principle.

The invention provides a method for determining subsurface fluid by seismic data obtained from geophysical exploration. The method comprises the following steps: converting the seismic data into bulk modulus and density data of the effective subsurface media; acquiring elastic modulus of the effective media at a borehole of a work area according to longitudinal and transverse wave log data; calculating the elastic modulus and the fluid modulus of the media at the borehole, porosity log data and pore aspect ratio spectrum data, low frequency model of solid matrix elastic modulus and the elastic modulus data volume of a dry solid matrix, separating well side fluid bulk modulus from the effective media bulk modulus which is inverted by the seismic data, and calibrating with the moduli of the borehole and well side fluid, and calibrating the moduli of other non-well side fluid by a calibration operator to identify the subsurface fluid. The method makes full use of the amplitude, frequency and phase information to invert the elastic modulus of the effective media, which reduces multi-resolution, breaks though the spherical void restriction and laboratory measurement requirements, and easily achieves the fluid modulus separation, and the fluid identification is direct, the result of the fluid identification is reliable, and the fitness of the fluid identification and well drilling result is up to more than 90%.

The invention discloses a method for recognizing the type of a vibration source of a tunnel, and a vibration source positioning method. The method for recognizing the type of the vibration source comprises the following steps: setting distance setting monitoring regions in the tunnel at intervals, wherein four corners of each monitoring region are respectively provided with a triaxial vibration sensor; collecting X-axis, Y-axis and Z-axis acceleration analog quantities of the triaxial vibration sensor in real time through the triaxial vibration sensor, and converting the acceleration analog quantities into digital quantities; carrying out the calculation and analysis of the monitoring data of the triaxial vibration sensor: building a vibration triggering algorithm; filtering background noises, judging the focus direction through longitudinal and lateral stationing combined analysis, and measuring the distance of a focus through a difference point of transverse and longitudinal wave propagation; and finally achieving an effect of precisely determining the focus. The method provides strong technological guarantee for the early warning and quick response of power safety production.

The invention discloses a method for determining a fluid by utilizing seismic fluid impedance. The method comprises the following steps: exciting and recording a seismic wave to obtain an angle gather; eliminating signal frequency distortion caused by a normal moveout correction stretching effect; extracting longitudinal wave reflectivity attributes and weighted transverse wave reflectivity attributes from the compensated angle gather; computing improved fluid factors; obtaining logging data to obtain a fluid impedance curve; performing iterative inversion to obtain a section of the fluid impedance; qualitatively analyzing fluid anomalies in pores by the fluid factors, and describing spatial distribution of the fluid by the fluid impedance. The method helps accurately extract the fluid factors and directly identify components of the fluid in the pores without an assumption of a velocity ratio of the longitudinal wave to the transverse wave as well as the relation between density and the longitudinal wave velocity, which reduces ambiguity of gas layer identification, realizes direct conversion from the fluid factors to the fluid impedance and improves the precision of gas reservoir identification.

The invention provides a method for performing joint inversion on the P-wave and S-wave velocity ratio of a reservoir by utilizing P-wave and converted wave data. According to the method, an inversion target function is constructed by adopting a concept that a gamma change rate acquired from gather seismic reflection information and a gamma change rate acquired from travel time information are infinitely approximate, and key parameters of the target function comprise a P-wave intercept, a P-wave gradient, a converted wave gradient and the P-wave and S-wave velocity ratio calculated according to the travel time information, and can be acquired from the actually input amplitude versus offset (AVO) information of a P-wave and converted wave gather and the travel time information, so that the target function can be rationally constructed, and a finally inverted P-wave and S-wave velocity ratio elastic parameter is accurate.

The invention discloses a method and a device for synchronously measuring rock sound wave and acoustic emission. The method comprises the following steps: A, putting sealing pressing ends for transmitting and receiving a sound wave signal at two ends of a rock sample, and keeping a longitudinal wave probe and a transverse wave probe inside the sealing pressing ends identical in the vertical direction; B, arranging and fixing an acoustic emission receiving probe outside the rock test sample; C, starting a sound wave and acoustic emission testing system, and starting a rock pressure machine for a loading experiment till the rock sample is damaged; D, performing aftertreatment on acquired data to obtain the number and the position and the ultrasonic speed change information of acoustic emission events of the rock; and E, respectively connecting a sound wave testing device and an acoustic emission testing device with experiment pressure machine base adapters, and connecting with a data acquisition and processing system through corresponding adapters. The method is feasible and simple and convenient to operate, synchronous acquisition of sound wave and acoustic emission information in rock mechanics tests is achieved, and positioning of a rock acoustic emission position is achieved.

The invention discloses a tunnel boring machine rock breaking seismic source and active source three-dimensional seismic combined advanced detection system. The system comprehensively utilizes two modes of active source seismic source and rock breaking seismic source to perform three-dimensional seismic combined advanced detection, adopts an active source seismic method with high shock energy to realize long distance advanced prediction and positioning recognition of geological anomalous bodies before operation of a tunnel boring machine, performs adjustment and optimization on the following construction of the tunnel boring machine according to a detection result, adopts cutterhead rock breaking vibration with weak shock energy and high ratio of transverse wave components as a seismic source, adopts an unconventional rock breaking seismic source seismic record processing method to realize the real-time short-distance accurate prediction of the geological anomalous bodies, performs representation and evaluation on the quality of surrounding rock in a region to be excavated, finally comprehensively judges the geological condition of a part in front of a working surface according to combined results of active source and rock break seismic source three-dimensional seismic advanced detection, and provides a support for the optimization of tunnel boring machine operating parameters and construction safety control.

The invention discloses an earthquake prediction method for porosity and shale content of a sand shale reservoir. The method comprises steps as follows: measuring test data of a core sample; calculating a matrix elastic parameter according to a rock physical theory; acquiring a longitudinal and transverse wave speed-porosity-shale content theoretical relation of the sand shale reservoir according to the matrix elastic parameter of the sand shale and the test data of the core sample; calculating logging porosity and logging shale content according to acquired actual logging data; on the basis of the longitudinal and transverse wave speed-porosity-shale content theoretical relation, performing parameter cross analysis, and calibrating and correcting the logging speed, the logging porosity and the logging shale content; establishing a quantitative prediction model about logging longitudinal and transverse wave impedance-porosity-shale content; acquiring an earthquake longitudinal wave impedance data cube, a transverse wave impedance data cube and a density data cube through earthquake pre-stack inversion; performing earthquake porosity and shale content data inversion to acquire an earthquake-predicted porosity data cube and an earthquake-predicted shale content data cube.

The invention belongs to the field of exploration geophysics and particularly relates to an elastic seismic wave field forward modeling method. The seismic forward modeling method includes the steps of firstly, according to the principle of wave field vector decomposition, decomposing a seismic wave field into a longitudinal wave field and a transverse wave field and respectively calculating corresponding propagation matrixes of the longitudinal wave field and the transverse wave field; secondly, according to the principle of low-rank decomposition, decomposing the propagation matrixes to obtain propagators of vector longitudinal wave and vector transverse wave so as to reduce calculation amount of numerical simulation to improve calculation efficiency; and thirdly, coupling updated records of the vector longitudinal wave and the vector transverse wave acquired after the numerical simulation so as to obtain a forward modeling result of the seismic wave field. The calculation precision is high due to the fact that the propagation matrixes include compensations to medium parameter and numerical simulation parameter. Numerical dispersion of seismic wave field records acquired by the forward modeling method is nearly eliminated and stability of the numerical simulation is high; accordingly, the forward modeling method is a high-precision elastic wave field numerical simulation method.