34 results about "Wave frequency" patented technology

A transducer structure for a surface acoustic device comprises a composite substrate comprising a piezoelectric layer, a pair of inter-digitated comb electrodes, comprising a plurality of electrode means with a pitch p satisfying the Bragg condition, wherein the inter-digitated comb electrodes are embedded in the piezoelectric layer such that, in use, the excitation of a wave propagating mode in the volume of the electrode means is taking place and is the predominant propagating mode of the structure. The present disclosure relates also to an acoustic wave device comprising at least one transducer structure as described above and to a method for fabricating the transducer structure. The present disclosure relates also to the use of the frequency of the bulk wave propagating in the electrode means of the transducer structure in an acoustic wave device to generate contribution at high frequency, in particular, above 3 GHz.

The present disclosure provides a fracture parameter prediction method and related equipment, and relates to the technical field of fracture parameter prediction in oil and gas exploration and development. The method comprises: acquiring seismic data; performing variational mode decomposition on the seismic data to obtain connotation mode component (IMF) data of different scales; and based on the IMF data, using an alternating multiplier method to gradually perform fracture weakness inversion to obtain target fracture parameters. According to the embodiment of the present disclosure, the seismic data can be adaptively divided into different scales, and the noise in the effective wave frequency band range can also be suppressed to a certain extent. Finally, multi-scale fracture weakness inversion is realized in the time domain, and stable fracture prediction is realized.

The application discloses a rate integration hemispherical resonator gyro angular rate output method, and belongs to the technical field of inertial technology. The application is aimed at solving the problem of large measurement noise of standing wave azimuth angle and poor gyro output precision in the existing rate integration hemispherical resonator gyro control method. In the application, the inherent working frequency of the gyro is taken as the initial value of the forward traveling wave frequency and the reverse traveling wave frequency, and the reference signals of the forward traveling wave and the reverse traveling wave are calculated and obtained; the reference signals are used to demodulate the electrode detection signals by using a low-pass filter, and the secondary demodulation quantity of the gyro angular rate is obtained by using the primary demodulation quantity; the phase difference between the forward traveling wave and the reverse traveling wave of the two groups of electrode detection signals and the forward traveling wave and the reverse traveling wave reference signals is calculated; the forward traveling wave and the reverse traveling wave reference signals are used to calculate the closed-loop real-time tracking of the forward traveling wave and the reverse traveling wave of the hemispherical resonator, and the sensitive axis angular rate measurement value of the rate integration hemispherical resonator gyro is calculated. The application is used for the angular rate output control of the rate integration hemispherical resonator gyro.

This invention provides an adaptive high-efficiency wave energy generation device and method, including a linear generator, a data acquisition device, a motor, an energy-absorbing float, a connecting rod, and a central controller. At least one motor is mounted on the bottom of the linear generator, and the bottom of each motor is connected to the energy-absorbing float. The connecting rod is mounted on the top of the energy-absorbing float and extends into the linear generator. The data acquisition device and the motor are both signal-connected to the central controller. The central controller drives the motor to apply optimal output force to the energy-absorbing float based on the output data from the data acquisition device. The energy-absorbing float achieves extremely high wave energy capture efficiency for the current ocean waves. It actively adjusts the force output by the motor to the energy-absorbing float for different wave frequencies, ensuring that the force output by the motor is always equal to the optimal output force, thus achieving all-weather high-efficiency wave energy capture.

The present application relates to a kind of wave frequency energy emission devices, the device includes: electromagnetic modulation layer, for modulating preset frequency and power electric signal pulse, and change magnetic field is generated according to the electric signal pulse;Energy conversion layer is arranged in the magnetic field range of the change magnetic field, and the energy conversion layer is used to convert the magnetic field energy of the change magnetic field into vibration energy wave;The energy conversion layer is composed of one or two kinds of strain materials, and the expansion rate and response time of each strain material are different;The vibration energy wave is used to cause the resonance inside target object, to change the state of the target object.The present application utilizes the characteristics that the energy conversion layer generates expansion with the change of electromagnetic field, causes vibration, thereby converts into high-frequency vibration wave, thereby improves the efficiency and effect of energy output.

The disclosure relates to a sensor for a quantity of a medium, such as the permittivity of the medium. This sensor comprises at least one sensitive element capable of: injecting waves, the injection being controlled by the application of an input signal, and collecting received waves, perturbed by physical properties of the medium related to said quantity, to form an output signal having, with respect to the input signal, a modulation from which a measurand indicative of said quantity of the medium is determined. The sensor also comprises a control unit capable of generating said input signal with a wave frequency to be injected corresponding to a chosen excitation frequency, and a processing unit applying a demodulation of the output signal to determine the corresponding measurand. In particular, the processing unit is configured to cooperate with the control unit to generate the input signal.The excitation frequency is adjusted according to the input and output signals using a feedback loop within the processing unit. This maintains a linear response of the output signal over a range of measurands by continuously adjusting the excitation frequency. The feedback loop is thus configured to ensure constant sensor sensitivity over this range. (See Figure 4 for an abstract diagram.)

The application provides a wave equation full-wave Q tomography method, which comprises the following steps: performing FFT transformation on existing seismic records to determine the frequency of a Ricker wavelet; performing forward simulation using the frequency of the Ricker wavelet determined in step 1 to obtain seismic correlation data; converting the seismic correlation data to a local domain and performing FFT on the data in the local domain to obtain the frequency of a single seismic event; obtaining the peak frequency shift of each seismic event in the local domain according to the frequency of the single seismic event; obtaining a companion source according to the peak frequency shift; performing wave field continuation calculation according to the companion source to obtain a back-propagating wave field; obtaining a gradient using the back-propagating wave field; and performing iterative updating using a conjugate gradient method according to the gradient to finally obtain an updated Q model. The method provided by the application can be simulated to obtain a relatively accurate Q model.

The present application relates to the field of wave energy generating buoy, disclose a kind of after bending pipe wave energy generating buoy and its air turbine switching device and method.For the defects that the existing single turbine buoy can only adapt to specific wave frequency, wide operating condition, low power generation efficiency, and easy to overload damage in extreme sea conditions, the present application connects wiles turbine and impact turbine at the end of single after bending pipe air path, real-time monitoring of wave frequency by wave frequency sensor, sliding guide cover driven by motor driving screw rod, to realize the adaptive switching of two turbines.When the wave frequency exceeds the effective range, the impact turbine is selected by default;In the effective range, greater than the threshold frequency selects the impact turbine, and less than the threshold frequency selects the wiles turbine.The present application combines the performance advantages of two turbines, the annual average power generation efficiency is improved by 32%, the turbine service life is extended to 8 years, the power supply reliability is more than 95%, and is suitable for power supply in offshore scenes such as islands and offshore platforms.

The invention discloses an arbitrary-shape fixed structure wave load identification method based on field wave elevation, relates to the field of ocean engineering structure health monitoring, and aims to solve the problem that a traditional method depends on incident wave information and is only suitable for a simple structure. The method comprises the following steps: averaging M surface elements on a wet surface of a discrete structure; pre-calculating and storing a transfer matrix which only depends on the structure geometry, the measuring point position and the wave frequency; wave elevation time history data of W measuring points are collected in real time, and main frequency components are reserved through fast Fourier transform; calling a corresponding transfer matrix, and obtaining a surface element pressure Fourier component through matrix multiplication; and performing inverse transformation to synthesize a pressure time history and integrating to obtain a total wave load. The invention also discloses a system for realizing the method, electronic equipment, a computer program product and a storage medium. The method is high in universality, does not need incident wave information, is efficient in calculation, and is suitable for various fixed ocean structures.

The invention relates to a cable insulation fault positioning method and system, and the method comprises the following steps: collecting a three-phase voltage traveling wave signal when a cable has a single-phase insulation damage grounding fault, and carrying out the signal decoupling, and obtaining an independent line mode component and a zero mode component; a Db45 wavelet basis is used as a mother wavelet, multi-scale wavelet decomposition and reconstruction are carried out on the decoupled line mode component so as to extract fault traveling wave head features, and the number of layers of multi-scale wavelet decomposition is determined according to the sampling frequency and the power grid fundamental wave frequency; and according to a wavelet reconstruction result, detecting the moment when a fault traveling wave head arrives at monitoring points at two ends of the line, thereby calculating the distance from a fault point to one end of the line. Compared with the prior art, the method has the advantages that inter-phase coupling interference is eliminated through phase-mode transformation, and serious voltage distortion and harmonic interference in a power grid are effectively suppressed by using the excellent time-frequency localization characteristic of the Db45 wavelet basis, so that the accuracy and reliability of cable insulation fault positioning are greatly improved.

The invention relates to a wave signal acquisition device, preferably a seismic acquisition device, comprising a housing (1); a wave sensor system housed inside the housing (1) and coupled to the bottom wall of the housing. The housing (1) is provided with an acoustic black hole (2) made of polymer, preferably flexible, so as to absorb parasitic wave frequencies below 500 Hz, preferably below 400 Hz. Figure for the abstract: Fig. 5

The application discloses a subway segment post-hole calculation and identification method and system based on knocking impact echo, and the method comprises the following steps: a vertical excitation subway segment is adopted by using an electric knocking device, and transient vibration response and sound radiation signals are synchronously collected by an acceleration sensor and a pickup; the device controls the voltage in real time according to the contact force, controls the knocking pulse waveform and amplitude, and ensures that the elastic wave frequency band covers the resonance range of the segment thickness; the vibration signal is denoised by empirical mode decomposition, the time-frequency spectrum is generated by short-time Fourier transform, and the direct wave and multiple reflected waves are separated; the main frequency, frequency width and sound pressure attenuation rate of the frequency spectrum are extracted, the effective thickness is calculated, a model is constructed, and the hole anomaly is judged; the probability statistical product coupling confidence factor is introduced, a report containing the hole coordinates, depth, range and compactness is output after reaching the standard, and the grouting repair parameters are matched; and reliable technical support is provided for the safety of the iron tunnel structure.

The application discloses a sea depth prediction method and system based on a variational filtering method and a baseband removal method, and a storage medium, relates to the technical field of geographic information data processing, and comprises the following steps: obtaining a gravity anomaly residual frequency domain signal and a ship-surveyed sea depth residual frequency domain signal; performing filter design to obtain a sea depth filter and a gravity anomaly filter; performing filtering to obtain a ship-surveyed sea depth mid-wave frequency domain signal and a gravity anomaly mid-wave frequency domain signal; obtaining a target area mid-wave predicted sea depth, a target area long-wave predicted sea depth and a target area short-wave predicted sea depth; and obtaining a target area predicted sea depth. In the scheme, the existing discrete data is used to obtain the target area predicted sea depth from the signal decomposition angle based on the semi-physical set and the semi-data fusion driving mode, the existing data is constrained in a fuzzy and wide range, the application range is widened, the experience interference is reduced, the time consumption is reduced while the result convergence is ensured, and the sea depth prediction effect is good.

A transducer structure for a surface acoustic device comprises a composite substrate comprising a piezoelectric layer, a pair of inter-digitated comb electrodes, comprising a plurality of electrode means with a pitch p satisfying the Bragg condition, wherein the inter-digitated comb electrodes are embedded in the piezoelectric layer such that, in use, the excitation of a wave propagating mode in the volume of the electrode means is taking place and is the predominant propagating mode of the structure. The present disclosure relates also to an acoustic wave device comprising at least one transducer structure as described above and to a method for fabricating the transducer structure. The present disclosure relates also to the use of the frequency of the bulk wave propagating in the electrode means of the transducer structure in an acoustic wave device to generate contribution at high frequency, in particular, above 3 GHz.

The application discloses a buoy and a control method thereof. The buoy comprises a floating body, a morphing wing and an adjusting mechanism. The morphing wing is connected with the floating body and is provided with a containing cavity. The adjusting mechanism is arranged in the containing cavity and comprises a driving assembly and an adjusting assembly. The fixed end of the driving assembly is connected with the morphing wing, the driving end of the driving assembly is hinged with the adjusting assembly, and the adjusting assembly is hinged with the morphing wing. The driving assembly can drive the adjusting assembly to adjust the shape of the morphing wing, so as to adjust the natural frequency of the buoy. The application can adjust the natural frequency of the buoy, so that the dynamic adjustment of the natural frequency of the buoy is realized, the buoy can resonate with waves in a wider frequency range, the optimal capture efficiency can be maintained in a wider wave frequency range, and the energy capture efficiency of the buoy in different sea conditions is improved.

This invention provides a Bragg resonance breakwater design method and breakwater. The Bragg resonance breakwater design method includes acquiring wave field characteristic parameters of the target sea area and determining the target wave frequency band based on the wave field characteristic parameters; determining the target wave frequency of each resonant unit based on the target wave frequency band, and determining the geometric parameters of the resonant cavity of the resonant unit based on the target wave frequency, so that the inherent resonant frequency of the resonant cavity matches the target wave frequency; determining the reflection coefficient index to characterize the wave dissipation effect based on the target wave frequency band, and determining the arrangement parameters of each resonant unit based on the reflection coefficient index under the premise of satisfying preset constraints, wherein the arrangement parameters change stepwise along the incident wave propagation direction; and outputting the resonant cavity geometric parameters and arrangement parameters corresponding to each resonant unit to form a Bragg resonance breakwater design scheme.

The invention discloses a method for determining guided wave frequency dispersion characteristics of a liquid-filled steel riser, which is characterized in that three-dimensional guided wave propagation is equivalent to a radial one-dimensional intrinsic problem under an axial symmetry condition, a relation between a complex wave number and frequency dispersion can be obtained only by dispersing the radial direction, and high degree of freedom of three-dimensional modeling is avoided. Internal fluid is not coupled through additional boundary terms, and is merged into the overall system by adopting a section contribution matrix, so that fluid-solid consistent assembly in the same system is realized, and error sources of coupling inconsistency are reduced. An external infinite water area does not use an absorption layer for approximation, and external water is equivalent to a wavenumber-related damping boundary by using radiation impedance meeting an infinite radiation condition; and the self-consistent complex wave number is solved through linearization and inverse iteration, so that the radiation modeling accuracy and solvability are improved.

The application provides a seawater motion magnetic field characteristic measuring device, which comprises a composite structure pipeline, an excitation system and a measuring system; the composite structure pipeline is used for improving the motion speed of seawater; the excitation system adopts square Helmholtz coils which are arranged on the upper and lower sides of the composite structure pipeline respectively and generate a uniform magnetic field between the coils, and the magnetic field direction is perpendicular to the cuboid pipeline; the measuring system adopts a ring-shaped magnetic core induction coil, the resonant frequency of the ring-shaped magnetic core induction coil is tuned to the fundamental wave frequency of a PWM square wave signal through parallel matching capacitors, the in-band output response is improved, and the out-of-band interference is suppressed; a preamplifier, an analog switch and a low-pass filter jointly constitute a phase-locked amplification circuit, the analog switch is controlled by a PWM signal, and the seawater motion magnetic field signal under the action of an alternating field is extracted from the interference environment.

The invention discloses a fault splitting device source load bidirectional identification method and system based on harmonic impedance, and relates to the technical field of new energy field station source load state identification, and the method comprises the steps: obtaining a grid-connected point voltage and current sampling value of a new energy field station, and calculating the fundamental frequency of the new energy field station; judging whether the fundamental wave frequency is within a preset fundamental wave frequency range or not; if yes, the fundamental wave power of the voltage and current sampling values of the grid-connected point is calculated, and the source load state of the new energy station is identified based on the fundamental wave power and the power direction criterion; if not, calculating a harmonic impedance module value of the voltage and current sampling value of the grid-connected point, and judging whether a line tripping signal sent by the fault splitting strategy station device is received or not; if not, identifying the source load state of the new energy station based on the harmonic impedance criterion; and if yes, identifying the source load state of the new energy station based on the harmonic impedance difference criterion. The technical problem that the source load characteristics of the new energy station cannot be accurately distinguished in the prior art is solved.

A numerical modeling method for an underwater complete axial symmetry space three-wave coupling sound field belongs to the field of nonlinear acoustics, and comprises the following steps: carrying out simple harmonic hypothesis on sound waves, and substituting the sound waves meeting difference frequency three-wave frequency matching conditions into a KZK equation to obtain a difference frequency three-wave coupling equation set; decomposing the equation set into a diffraction equation, a dissipation equation and a nonlinear equation by using a second-order Strong operator splitting method; a diffraction equation is solved by using a chasing method, a dissipation equation is solved by using an accurate analytical solution, and a nonlinear equation is solved by using an explicit Euler method; and setting boundary conditions, and calculating an underwater complete axial symmetry space three-wave coupling sound field. According to the method, a three-wave coupling sound field model is established based on a KZK equation, efficient solving of a three-wave coupling equation set is achieved by utilizing a second-order Strong operator splitting method and combining finite difference and an explicit Euler method, and the three-wave coupling sound field in the underwater complete axial symmetry space is accurately calculated. According to the invention, the calculation complexity is reduced, the calculation efficiency is improved, and the calculation result is accurate.

The application discloses a wave load calculation analysis method and device, which constructs a platform overall structure finite element model; determines wave frequency, wave direction angle, wave amplitude and lag phase which cause maximum wave-induced load; inputs the wave frequency, wave direction angle, wave amplitude and lag phase to the platform overall structure finite element model to calculate the structure response and output load calculation analysis results. The application improves the prediction accuracy of the response of the offshore comprehensive test platform under the action of waves. The performance of the platform structure under extreme wave conditions can be evaluated, and the basis for structural design and safety evaluation is provided.

This invention discloses a variable cross-sectional area friction-electromagnetic composite power generation raft buoy and method, solving the problems of low power generation efficiency caused by the non-adjustable natural frequency and mismatch between the optimal operating frequencies of TENG and EMG in existing wave energy buoys. This invention dynamically adjusts the raft width through a symmetrically arranged variable cross-sectional area mechanism, enabling the natural pitch frequency to track common ocean wave frequencies of 0.5Hz-2Hz in real time, achieving broadband resonance energy capture. It innovatively designs a dual-path transmission module, simultaneously decomposing the same wave pitch motion into a low-frequency extension motion matching the TENG and a high-frequency linear motion matching the EMG, allowing both to operate within their peak efficiency range. Hydraulic transmission is used to transfer mechanical energy, and multiple buoys can be quickly hinged together to form an expandable power generation array. This invention improves wave energy capture efficiency by more than 3 times across all sea states and increases total power generation by more than 60%, making it suitable for self-powering distributed equipment such as ocean buoys, observation stations, and underwater sensors.

The disclosure pertains to an over-the-air test apparatus for characterizing a device under test (DUT) at mm-wave frequencies, the apparatus comprising a measurement chamber enclosing a measurement space; a testing chamber enclosing a testing space, the testing chamber being arranged in the measurement chamber, and structured to accommodate the device under test; an environmental setting unit structured to establish set a conditioned environment in the testing chamber; wherein the testing chamber is made from a material, which is at least transparent to electromagnetic radiation.

The invention belongs to the technical field of scale treatment, and discloses a scale removal control method based on the Internet of Things. The method comprises the steps that a water supply pipe network is evenly divided into a plurality of water supply pipe sections, the scaling risk of each water supply pipe section is sequentially calculated, and the length of each water supply pipe section is dynamically adjusted; pipeline vibration signals of all the water supply pipe sections are collected, net resonance frequencies are extracted, and scaling pipe sections in the water supply pipe sections are accurately positioned; water quality standard indexes of all the scaling pipe sections are collected, the scale types of all the scaling pipe sections are determined, the sound wave frequency is automatically adjusted to generate directional resonance on all the scaling pipe sections, and the scale in all the scaling pipe sections is gradually stripped; the movement track of each stripped scale is monitored in real time, the arrival time of each stripped scale arriving at each collecting device is predicted, and the collecting devices are intelligently started to collect the stripped scales; intelligent sensing, accurate diagnosis and self-adaptive control of the scaling condition of the water supply pipe network can be achieved, and the operation continuity and the water quality stability of the water supply pipe network are guaranteed.

The invention belongs to the technical field of marine environment monitoring, particularly relates to a marine environment noise observation device capable of preventing sea wave jitter, and provides the following scheme aiming at the problem that a detection device shakes all the time when a floating block below the existing detection device surges: the marine environment noise observation device comprises a floating ring which can float on the sea and is of an annular structure; a barrel-shaped base with an upward opening and of a barrel-shaped structure is detachably fixed to the top end of the floating ring, a round hole is formed in the middle of the bottom of the barrel-shaped base, four vertical rods are embedded in the inner wall of the round hole of the barrel-shaped base at equal intervals, and spring ropes are fixed to the top ends of the four vertical rods; the ends, away from the vertical rods, of the four spring ropes are fixedly provided with the same anti-tilt balance weight ball. When the surge frequency is large, namely, the magnet I at the inner edge of the round hole fluctuates up and down frequently, staggered adsorption attraction force can be generated at the moment, then the swinging force of the anti-tilt counterweight ball is counteracted, and it can also be ensured that the anti-tilt counterweight ball is kept in a vertical state.

The present application relates to the field of wave energy generating buoy, disclose a kind of after bending pipe wave energy generating buoy and its air turbine switching device and method.For the defects that the existing single turbine buoy can only adapt to specific wave frequency, wide operating condition, low power generation efficiency, and easy to overload damage in extreme sea conditions, the present application connects wiles turbine and impact turbine at the end of single after bending pipe air path, real-time monitoring of wave frequency by wave frequency sensor, sliding guide cover driven by motor driving screw rod, to realize the adaptive switching of two turbines.When the wave frequency exceeds the effective range, the impact turbine is selected by default;In the effective range, greater than the threshold frequency selects the impact turbine, and less than the threshold frequency selects the wiles turbine.The present application combines the performance advantages of two turbines, the annual average power generation efficiency is improved by 32%, the turbine service life is extended to 8 years, the power supply reliability is more than 95%, and is suitable for power supply in offshore scenes such as islands and offshore platforms.

The invention relates to the technical field of hybrid direct-current power transmission systems, in particular to a harmonic detection method and device for a hybrid direct-current power transmission system. The method comprises the following steps: determining segmentation duration based on a dominant frequency extracted from a component, and dividing the component into signal segments according to the segmentation duration; determining a waveform consistency index according to amplitude fluctuation similarity between adjacent signal segments; determining an initial harmonic confidence coefficient according to the waveform consistency index, the amplitude of the main frequency and the half-power bandwidth; determining the dynamic correlation degree of the component and the fundamental wave signal according to the active power data of the system and the amplitude change characteristics of the component and the fundamental wave signal; determining integer frequency multiplication integrating degree according to the deviation degree of the dominant frequency of the component relative to the fundamental wave frequency; according to the dynamic correlation degree and the integer frequency multiplication integrating degree, determining the comprehensive harmonic confidence degree of the component; and judging whether the component is a harmonic component according to the initial harmonic confidence and the comprehensive harmonic confidence, and analyzing and outputting the electrical characteristic parameters of the harmonic component, thereby improving the accuracy of harmonic identification.

The invention discloses a buoy and a control method thereof, the buoy comprises a floating body, a deformation wing and an adjusting mechanism, the deformation wing is connected with the floating body, and the deformation wing is provided with a containing cavity; the adjusting mechanism is arranged in the containing cavity and comprises a driving assembly and an adjusting assembly, the fixed end of the driving assembly is connected with the deformation wing, the driving end of the driving assembly is hinged to the adjusting assembly, and the adjusting assembly is hinged to the deformation wing. The driving assembly can drive the adjusting assembly to adjust the shape of the deformation wing so as to adjust the inherent frequency of the buoy. The inherent frequency of the buoy can be adjusted, so that dynamic adjustment of the inherent frequency of the buoy is realized, resonance with waves in a wider frequency range can be realized, nearly optimal capturing efficiency is kept in the wider frequency range, and the energy capturing efficiency of the buoy under different sea conditions is improved.

This invention discloses a wide-frequency-domain active resonant built-in point absorption wave power generation device and its control method, belonging to the field of wave power generation technology. The device includes an energy harvesting system, a PTO system, an active resonant control system, and an energy storage system. The energy harvesting system includes a cylindrical float. The active resonant control system includes a wireless data transceiver unit, a control unit, a pull-wire sensor, and a variable inertia mechanism. The wireless data transceiver unit is fixed to the top of the cylindrical float, the control unit is fixed to the upper part of the cylindrical float, and the pull-wire sensor is located between the upper and lower parts of the cylindrical float. This invention uses the above-mentioned device and method to track and match the changing wave frequency through active resonant control, achieving resonance. This maintains high energy conversion efficiency even in sea areas with wide-frequency wave variations, solving the problems of traditional point absorption devices that can only operate at a single resonant frequency and generating a large amount of reactive power by controlling the electromagnetic force of a motor to achieve resonance.