82 results about "Wave resonance" patented technology

The invention provides a three-dimensional intelligent sorting method and system for dangerous goods logistics. Multi-frequency-band sound wave signals are emitted in a storage space through a sound wave standing wave array, a three-dimensional frequency coding grid is formed through standing wave interference, millimeter-level accurate positioning of a dangerous goods container is achieved, and a sorting execution instruction is generated. Airfoil piezoelectric ceramics of the aircraft receive sound wave signals and convert the sound wave signals into flight attitude parameters, a sorting path is planned in combination with a path tracking algorithm, meanwhile, a dynamic sorting channel opening is generated through airfoil flutter frequency and sound wave standing wave resonance, and a leakage container is accurately guided to be transferred to an isolation area. According to the method, the accuracy and efficiency of dangerous goods sorting can be remarkably improved, the risk of manual intervention is reduced, and a whole-process intelligent solution is provided for storage safety.

The invention discloses a non-linear optical structure with perfect phase matching and high second harmonic generation efficiency. The non-linear optical structure comprises a fundamental frequency wave resonance structure, a non-linear optical layer, a second harmonic reflection structure and a substrate, the fundamental frequency wave resonance structure is used for generating electromagnetic field local enhancement at an incident fundamental frequency wavelength and realizing a phase matching condition by optimizing electric field phase distribution; the nonlinear optical layer is used for frequency conversion from fundamental frequency waves to second harmonics and regulating and controlling harmonic radiation capability and phase regulation and control; the second harmonic reflection structure is used for controlling coupling-out of second harmonics; the rotary nonlinear optical layer can adjust the phase characteristic of the radiated second harmonic so as to realize perfect phase matching of a harmonic field; according to the nonlinear optical structure with perfect phase matching and high-efficiency second harmonic generation efficiency, accurate control of phase matching conditions is realized through reasonable optical film stacking and phase matching technologies, and high-efficiency coupling-out and utilization of second harmonics are ensured.

The invention discloses a wind turbine generator impeller anomaly detection method and system based on sound vibration signal identification. According to the method, firstly, impeller response is collected through a microphone / vibration sensor, and a Mel spectrogram is generated; then, a Teager-Kaiser energy operator and self-correlation analysis are utilized, and under the condition of not depending on a rotating speed signal, the rotating period of the impeller is recognized, and frequency spectrum segmentation is carried out; calculating a cross-period Mel frequency spectrum dynamic deviation, and normalizing the cross-period Mel frequency spectrum dynamic deviation through an amplitude correction coefficient related to the rotating speed; generating a periodic coherent energy diagram by adopting an improved structural similarity algorithm; performing filtering enhancement by using a harmonic resonance template, performing morphological deconstruction and parameterization on an abnormal region in the graph, and extracting geometric features; and finally, calculating a comprehensive abnormal score based on the multi-dimensional features and realizing automatic early warning. According to the method, the problems of variable working condition interference and rotating speed dependence are effectively solved, and accurate and stable detection of early abnormality of the impeller can be realized.

The invention provides a sleep assisting system based on photoacoustic magnetic vibration wave resonance, and relates to the technical field of sleep assisting. The system comprises an acquisition unit, a processing unit, a stimulation unit and an evaluation feedback unit. Determining a sleep stage of the user, analyzing phases of multi-scale electroencephalogram rhythm components such as slow waves and spindle waves in a cross-scale manner, and extrapolating and predicting a phase value of a target electroencephalogram rhythm at a future moment in combination with a recent phase trajectory; taking the predicted phase as a target state, mapping a rising / falling slope of a slow wave form into an intensity change parameter of photoacoustic and magnetic vibration stimulation by constructing a mapping channel, and selecting an optimal stimulation combination for output through a decision model based on the intensity change parameter; calculating a phase locking effect index, and adjusting a phase prediction model parameter by using an optimization algorithm according to the index so as to optimize subsequent stimulation; and linkage regulation and control of an external environment are supported, and centralized monitoring of sleep states of multiple users can be realized. According to the invention, self-adaptive guidance of sleep brain rhythms is realized, and the sleep quality is effectively improved.

The invention belongs to the technical field of gear transmission, and discloses a dynamic modeling method of a flexible bevel gear system considering meshing point change, which is used for analyzing vibration response and dynamic stress response characteristic laws of the bevel gear system in a traveling wave resonance state. And further analyzing the traveling wave resonance phenomenon of the spiral bevel gear system in the aero-engine accessory casing. A three-dimensional shell unit and a beam unit are adopted to establish a bevel gear pair finite element entity model. A dynamic model of the flexible bevel gear system considering meshing point changes is established by adopting a substructure modal synthesis method and a rotation modal projection method. The reliability of the provided model is verified through a finite element entity model and an experimental test result. On the basis, dynamic response and vibration stress experiment tests are combined, and the traveling wave resonance phenomenon of the bevel gear system is researched. The research result of the provided model has theoretical significance on design and fault monitoring of the aero-engine bevel gear system.

The invention provides a short bolt axial stress detection method and device based on electromagnetic ultrasonic resonance, and relates to the technical field of industrial fastener stress detection. The method comprises the following steps: determining a preset period and frequency of an excitation signal according to material characteristics of a to-be-measured short bolt, and calibrating resonant frequency and stress to obtain a calibration curve; classifying the lengths of the short bolts to be measured to obtain bolts with known original lengths and in-service bolts with unknown original lengths; based on the determined preset period and frequency, first-order resonant frequency corresponding to the bolt with the known original length is obtained through an electromagnetic ultrasonic transducer and a single-wave resonance method; based on the determined preset period and frequency, first-order resonant frequency corresponding to the in-service bolt with the unknown original length is obtained through an electromagnetic ultrasonic transducer and a double-wave resonance method; and calculating the axial stress of the corresponding short bolt to be measured according to the calibration curve and the first-order resonant frequency. The problems that in the prior art, the energy conversion efficiency is low, and the short bolt detection effect is poor are solved.

The invention belongs to the technical field of oil-gas exploration, particularly relates to a hydraulic fracturing monitoring method based on Krauklis wave resonance, and aims at solving the problem that the monitoring effect is poor in the hydraulic fracturing process. Comprising the steps that a vibration signal of a target well in the hydraulic fracturing process is obtained; extracting a plurality of sub-signal segments of the vibration signal according to the time sequence, and performing time-frequency analysis on each sub-signal segment by adopting short-time Fourier transform to obtain a time-frequency spectrogram of the vibration signal; acquiring a resonance energy amplitude statistical chart of the vibration signal; under the condition that the resonance energy amplitude statistical chart meets preset conditions, it is determined that hydraulic fracturing succeeds, and the preset conditions include that after the resonance energy amplitude average value in the set duration is changed from the first amplitude to the second amplitude, the resonance energy amplitude average value is kept within the set range with the third amplitude as the center, and the second amplitude is higher than the first amplitude and the third amplitude. The hydraulic fracturing process can be visually and rapidly evaluated, and dynamic monitoring of the hydraulic fracturing process is achieved.

The invention discloses a spiral bevel gear wheel disk co-vibration stress test identification method, and relates to the technical field of bevel gear wheel disk resonance stress identification. And the resonance rotating speed, the resonance frequency and the radial plate co-vibration stress in the working rotating speed interval can be determined, so that subsequent vibration reduction optimization treatment is facilitated. Comprising the following steps: step 1, information acquisition; step 2, constructing a radial plate dynamic stress test bed; step 3, carrying out a constant-speed acceleration frequency sweeping test; 4, according to the relation graph of the strain and the rotating speed obtained in the step 3, obtaining a resonance rotating speed interval and a traveling wave resonance rotating speed point when pitch diameter type resonance occurs; step 5, carrying out a rotating speed retention test; step 6, data analysis; and 7, processing a result. According to the scheme, a vibration reduction design scheme of the bevel gear can be accurately and rapidly formulated, and lightweight vibration reduction design of the bevel gear is facilitated.

The invention relates to the technical field of detection, in particular to a geomagnetic fine detection method, which comprises the following steps of: determining an object to be detected and an inherent electromagnetic wave resonance frequency of the object to be detected; the detection device is perpendicular to the to-be-detected object and moves at a constant speed to obtain magnetic field change information, and the specific position of the to-be-detected object is judged according to magnetic field induction change. According to the method, the stability of a natural geomagnetic field is utilized, magnetic resistance can be generated due to the difference of magnetic permeability of various substances, so that the phenomenon of magnetic overflow or convergence is generated on the earth surface, and existence and distribution conditions of ground fissures, cavities and various underground pipelines are determined by detecting geomagnetic anomalies; the abnormality is found by testing the change of induced electromotive force voltage generated when the conductor cuts the magnetic line of force; and determining the type and depth of the magnetic anomaly substance by using the substance frequency characteristics of various substances.

The invention relates to the technical field of bedding, and discloses a negative oxygen ion superposition sound medicine system and a biological wave resonance brain wave pillow capable of helping sleep, and the system is composed of a negative oxygen ion generation module, a sound medicine playing module, an intelligent control module and a user feedback module. Audio with specific frequency and sound is played through the sound and medicine playing module, natural sound or soothing music is beneficial to soothing the nervous system of a user and promoting relaxation and sleep, the audio playing quality and effect are ensured through audio signal spectrum analysis and sound waveform description, the audio signals are in a proper frequency range, and the audio playing effect is improved. The sleep state and demand of the user are identified through physiological data monitoring and data analysis, and the improvement suggestions are provided according to the data, so that the system function is optimized, the sleep quality of the user is improved, and the beneficial effect that the pillow is assisted to enable the user to quickly fall asleep is achieved.

The utility model discloses a waste collecting device after physical wave resonance cleaning, which belongs to the technical field of cleaning and comprises an ultrasonic cleaning machine, a control panel mounted on the outer wall of the ultrasonic cleaning machine and a supporting plate mounted at the top of an inner cavity of the ultrasonic cleaning machine and provided with a through hole. A semicircular groove is formed below the supporting plate, wing plates arranged at an angle are symmetrically and fixedly connected between the semicircular groove and the inner wall of the ultrasonic cleaning machine, and a rotating shaft with the end rotationally connected with the ultrasonic cleaning machine is arranged on the inner side of the semicircular groove. The outer wall of the rotating shaft is fixedly connected with a spiral blade with the outer diameter matched with the inner diameter of the semi-circular groove, the rotating shaft is driven to rotate by starting the driving motor, so that waste materials located in the semi-circular groove are conveyed by the spiral blade to be discharged through the discharging opening and finally fall into the collecting box, the waste materials are intercepted through the filter screen, and solid-liquid separation is achieved; and the tedious operation of manual cleaning is omitted.

Embodiments of the present disclosure provide a robot anomaly detection method based on interference residual wave resonance amplification, which is applied to the technical field of robot state monitoring and fault diagnosis. The method comprises: acquiring a robot operation data set, mapping multi-modal heterogeneous features of each sample to a complex domain to generate a virtual wave function; calculating a background wave function representing the commonality of the majority class samples and generating an anti-phase reference wave function according to batches; performing complex vector addition on the virtual wave function of each sample and the anti-phase reference wave function to obtain an interference residual wave function; determining a resonance gain coefficient based on the prior proportion of the minority class samples, performing nonlinear exponential amplification on the interference residual wave function, obtaining an energy value through time domain integration and comparing the energy value with a threshold value, and outputting an anomaly detection result. The present disclosure does not need artificial sample synthesis and gradient training, suppresses the majority class by destructive interference and amplifies the minority class by coherent resonance, and realizes high-precision detection of robot anomalies under extremely imbalanced data.

The application provides a device and method of fusing radar radio frequency induction and heterogeneous interface coupling technology, through an electromagnetic super surface pattern array antenna with metal characteristics on the inner surface of the heterogeneous interface, a fixed module is bonded around the electromagnetic super surface pattern array antenna, the fixed module and the electromagnetic super surface pattern array antenna jointly form a closed electromagnetic wave resonance cavity region, a high polymer medium material for radiating and conducting electromagnetic waves is built-in, and a radar radio frequency induction control system; electromagnetic waves emitted by a radar microstrip antenna are repeatedly reflected, superimposed and enhanced in the electromagnetic wave resonance cavity region through the high polymer medium material, and then radiated to an external space induction area of the heterogeneous interface through the electromagnetic super surface pattern array antenna, so that activities or micro-motion targets in the induction area range are detected, and a double threshold control logic output control instruction is adopted to improve the induction and control precision of the radar induction system.

To provide an electromagnetic wave resonance structure that absorbs a terahertz wave.SOLUTION: An electromagnetic wave resonance structure has a conductive part and a non-conductive part, and the non-conductive part has a region where an insulator is mixed into the conductive part.SELECTED DRAWING: Figure 9

The utility model relates to the field of infrared detection, in particular to an infrared detector, which sequentially comprises a reflecting layer, a supporting layer, a thermosensitive film layer, a thermosensitive protective layer and a conductive resonance layer from bottom to top, the reflecting layer and the supporting layer are arranged at an interval, and a resonant cavity is formed between the reflecting layer and the supporting layer; the conductive resonance layer comprises a resonance pattern, the resonance pattern is a pattern formed by resonance lines, and the resonance lines are lines comprising broken areas. Due to the fact that a broken area exists between the resonance lines, strong infrared electromagnetic wave resonance can occur in the broken area, the near-field electric field intensity is greatly enhanced, under the condition that the dielectric loss of a material is fixed, the higher the near-field electric field intensity is, the higher the electromagnetic loss is, and finally absorption of an electromagnetic field is greatly enhanced. And the conductive resonance layer is small in occupied space, relatively simple in structure and extremely easy to integrate with a related uncooled infrared pixel structure based on a thermosensitive thin film material, so that the production cost is greatly reduced.

A method for feeding pressurized air pulses to a quarter wave resonance tube, for generating a standing low-frequency sound wave in said quarter wave resonance tube. The method entails that the pressurized air pulses supply maximum input power to said standing low-frequency sound wave by feeding said pressurized air pulses only during the time intervals of the oscillation cycle when the air pressure in said rear end of the quarter wave resonance tube, is positive. Also disclosed is a revolving valve, for feeding pressurized air pulses to a quarter wave resonance tube, for generating a standing low-frequency sound wave in said quarter wave resonance tube.

The present invention provides a test system and method for measuring the linewidth of non-linear excited spin-wave resonance under vertical parametric pumping based on a microstrip line. The test system is as follows: A microwave source is connected to a power amplifier; the power amplifier is connected to one end of the microstrip line; a sample to be tested is placed on the microstrip line, and an external magnetic field is applied to the sample by an electromagnet, with the magnetic field direction perpendicular to the long axis direction of the microstrip line; the other end of the microstrip line is sequentially connected to a power attenuator, a detection diode, and a lock-in amplifier; and a computer terminal is connected. The test program is based on a LabVIEW control program, which regulates the magnetic field intensity of the electromagnet, real-time collects the amplitude of the output signal of the lock-in amplifier, and dynamically plots the voltage-magnetic field intensity relationship curve; when the microwave power is increased until the waveform undergoes non-linear distortion, the spin-wave resonance linewidth is calculated using a formula according to the critical microwave power and the threshold radio frequency magnetic field amplitude. Advantages: It realizes the measurement of the non-linear spin-wave resonance linewidth in an ultra-wide frequency band and with low power detection, improving the detection accuracy and operation efficiency.

A Josephson traveling wave parametric amplifier (JTWPA) comprising an input for receiving a signal, an output for providing an amplified output of the signal and one or more circuit segments in series between the input and the output and is configured for receiving a pump tone for transferring energy from the pump tone to the signal and to an idler tone. Each of the one or more circuit segments comprises, in series, one or more superconducting nonlinear elements in series, and a first resonator with a first fundamental resonance frequency configured for phase matching the pump tone with the signal and the idler tone and a second resonator with a second fundamental resonance frequency configured for mitigating pump depletion at a frequency corresponding to a higher harmonic of the pump tone with the second fundamental resonance frequency being higher than the first fundamental resonance frequency.

The invention discloses an energy-saving offshore oil platform crude oil recovery device which comprises a treatment tank, a cover body is placed at the top of the treatment tank, the left side and the right side of the top of the cover body are connected with an air suction pipe and a liquid suction component respectively, a metering pump is installed on the rear side of the top of the cover body, and a filling pipe is arranged in the center of the top of the treatment tank. Through cooperative use of the treatment tank, the connecting ring plate, the cover body, the filling pipe, a liquid outlet pipe, a metering pump, a liquid drawing pipe, a liquid pumping component and a stirring component, the device has the advantage of providing a closed recycling environment, and the top of the treatment tank can be sealed, so that when the treatment tank shakes, liquid in the treatment tank cannot overflow; the use environmental protection property of the offshore oil platform is improved; furthermore, the upper and lower honeycomb-shaped guide plates are used, so that the water body can be divided into small units to flow, and the wave resonance is inhibited; and through the rubber shock insulation pad, the vibration transmission efficiency between the recovery device equipment and the offshore oil platform deck is reduced.

The invention relates to the technical field of coastal engineering, and discloses a long-period wave-reducing breakwater based on the water wave resonance principle. The breakwater comprises a C-shaped resonator and a plurality of pile legs, wherein a base is commonly connected between the C-shaped resonator and the plurality of pile legs, the C-shaped resonator is detachably connected to the upper end of the base through bolts, and the plurality of pile legs are circumferentially distributed at the lower end of the base, and the base, the C-shaped resonator and the plurality of pile legs jointly form a wave-reducing unit, which is arranged in a rectangular array to form a breakwater, and the outer diameter, the inner diameter and the opening size of two adjacent C-shaped resonators in the array are gradually changed according to a certain rule, and the C-shaped resonator utilizes a large cavity and a small opening structure to induce resonance to reduce long waves several times the wavelength of a characteristic size of a cylinder, so that waves of different frequencies undergo local resonance and wave-reduction at different spatial positions of the array-type breakwater, and long-period waves within a wide frequency domain are effectively reduced, and a sheltered water area with stable mooring is formed behind the breakwater.

The invention provides a process for synthesizing ammonia through nitrogen electroreduction assisted by sound wave resonance, belongs to the technical field of new energy catalysis and green nitrogen circulation, and is particularly suitable for converting nitrogen (N2) into ammonia (NH3) through an electrochemical mode at normal temperature and normal pressure. According to the process, an efficient electro-catalysis electrode is designed, a piezoelectric transducer is introduced to apply sound wave excitation with a specific frequency (2-8 MHz), and an electric field and a sound field have a synergistic effect, so that the adsorption and activation capability of a catalyst on nitrogen is remarkably improved, the electron transfer efficiency is enhanced, and the generation rate and selectivity of ammonia are effectively improved. After a piezoelectric transducer is adhered to the back of an electrode, sound wave excitation is applied through an external signal source, a micro-scale cavitation effect and shear disturbance are generated on an electrolyte interface, N is equivalent to N bonds are destroyed, and generation of ammonia molecules is promoted. The process is operated at the potential of-0.2 to-0.6 V (vs RHE), the ammonia generation rate can exceed 5 [mu] g.h <-1 >. Cm <-2 >, and the Faraday efficiency is higher than 15%. Compared with a traditional pure electro-catalysis nitrogen reduction method, the method has the advantages that the ammonia generation rate is remarkably increased, the competitive hydrogen evolution reaction (HER) is effectively inhibited, and the stability of a catalyst interface is improved. In addition, the catalytic material used in the process is wide in source and simple and convenient in assembly mode, and can be compatible and integrated with the existing electrolytic tank module. The technology has a wide application prospect, is particularly suitable for distributed green ammonia synthesis, organic nitrogen fixation and carbon neutralization energy systems, and has important scientific research value and industrial transformation potential.

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 a compressor torque compensation method and variable frequency air conditioning equipment. The method comprises the steps that vibration acceleration frequency spectrums of a compressor in multiple directions under adjacent operation frequencies are obtained, the vibration acceleration frequency spectrums comprise vibration acceleration amplitude values under a fundamental wave frequency and a harmonic wave frequency, and according to the vibration acceleration amplitude value change trend of the fundamental wave frequency or the harmonic wave frequency under the adjacent operation frequencies, the vibration acceleration frequency spectrums of the compressor in multiple directions are obtained; and judging whether the compressor generates fundamental wave resonance or harmonic wave resonance at the current operation frequency, determining a torque compensation strategy according to the resonance mode and the resonance direction under the condition of judging that the compressor generates fundamental wave resonance or harmonic wave resonance at the current operation frequency, and executing the torque compensation strategy in a resonance frequency range containing the current operation frequency, and torque compensation current is determined, and torque compensation is conducted on the compressor according to the torque compensation current. By the adoption of the method, directional and accurate vibration suppression can be achieved, and the compensation effect is remarkably improved.

The invention relates to the field of multi-mode resonance, in particular to a target object data acquisition system based on photoacoustic magnetic vibration wave resonance, and the system comprises a data acquisition module which is used for obtaining neural response data when a target object receives single stimulation; the nerve response relation generation module is used for acquiring a nerve response relation stimulated by the opto-acoustic magnetic vibration waves; the mismatch result generation module is used for calculating a starting time mismatch component, a stimulation intensity mismatch component and a continuous coverage mismatch component of the photoacoustic magnetic vibration wave stimulation to form a mismatch result of the photoacoustic magnetic vibration wave stimulation; the differential compensation control parameter set generation module is used for generating a differential compensation control parameter set; and the multi-mode collaborative stimulation output module is used for performing collaborative control on light stimulation, sound stimulation, magnetic stimulation and mechanical vibration stimulation to form light-sound-magnetic vibration wave resonance stimulation. According to the system, effective resonance of different stimuli is realized, and the collaborative perception ability and nerve response stability of a target object to multi-modal stimuli are enhanced.

The present application belongs to the technical field of offshore engineering equipment design and manufacturing, and discloses a high-efficiency floating breakwater based on a Helmholtz water wave resonance cavity, which comprises a Helmholtz resonance cavity breakwater main body, a pile foundation and a non-powered lifting limiting auxiliary device. The breakwater main body is affected by tides or waves, and the change in sea level height leads to a change in buoyancy. The non-powered lifting limiting auxiliary device is used to realize lifting adjustment and self-position adjustment to ensure the wave-absorbing effect. The limiting hole and the limiting platform on the pile foundation constrain the position of the breakwater main body. The present application uses a Helmholtz resonance cavity and a local resonance type artificial periodic structure formed by the periodic arrangement of multiple Helmholtz resonance cavities, which can increase the wave-absorbing frequency band. The periodic arrangement of the Helmholtz resonance principle is an effective way to reduce and absorb long waves, and has the advantages of simple structure, excellent performance, strong modularization and significantly improved wave-absorbing performance when the Helmholtz resonance cavities with the same volume are arranged periodically.

The invention relates to the field of data security transmission methods, in particular to a data security transmission method and system for a vehicle-mounted OBU, and the method comprises the steps: collecting a sound wave signal in a vehicle in real time through a vehicle-mounted OBU microphone array, loading the sound wave signal to a first analysis model, and obtaining a target sound wave feature; comparing and judging the target sound wave characteristics with a preset pet sound wave resonance characteristic template stored in a local on-board unit (OBU) through a second analysis model, performing interference signal filtering on the pet sound waves to obtain filtered OBU data when the target sound wave characteristics accord with the preset pet sound wave resonance characteristic template, and performing encryption processing on the filtered OBU data, the encrypted data is safely transmitted to the background server in a wireless communication mode, so that the problem of data safe transmission caused by voiceprint false triggering is solved.

The utility model discloses a far-field low-frequency electromagnetic coupling energy signal hybrid transmission circuit, which relates to the field of energy signal transmission, and comprises a transmitting unit, a receiving module, a modulation module, a first triode and a second triode, the first triode is used for receiving analog signals and providing input voltage for the transmitting module, and the second triode is used for receiving the analog signals; the modulation module generates frequency square waves and sends the frequency square waves to the transmitting module through the second triode; and the receiving unit comprises a receiving module and a signal receiving end, the receiving module receives the electric energy and the modulation signal from the transmitting module, and the signal receiving end performs feature extraction on the electric energy and the modulation signal. According to the non-radiative magnetic coupling principle, far-field low-frequency electromagnetic wave resonance is utilized, the transmission distance is effectively increased, energy transmission and signal receiving are synchronously achieved, and mixed transmission of signals and electric energy is achieved by extracting signal features and being large in signal strength and free of distortion or slightly distorted.

The present application discloses a method, device, medium and product for analyzing the harmonic resonance characteristics of cylindrical bubbles, which relates to the field of fluid mechanics technology. The method includes: constructing a dimensionless bubble wall motion equation and a second-order accuracy analytical solution model when a cylindrical bubble undergoes harmonic resonance with an external acoustic excitation; harmonic resonance includes: 2nd-order superharmonic resonance and 1 / 2-order subharmonic resonance; based on the Lyapunov stability theory and the Routh-Hurwitz stability criterion, the dimensionless bubble wall motion equation and the second-order accuracy analytical solution model when a cylindrical bubble undergoes harmonic resonance with an external acoustic excitation are quantitatively analyzed for the local stability of the steady-state oscillation solution and the global stability of the bubble oscillation, and analysis results are obtained; based on the analysis results, the influence mechanism of the core parameters on the harmonic resonance characteristics of the cylindrical bubble is determined. The present application realizes the precise analysis of bubble oscillations and analyzes the local stability and global stability of bubble oscillations.

This application belongs to the technical field of oil and gas exploration, and specifically relates to a hydraulic fracturing monitoring method based on Krauklis wave resonance, aiming to solve the problem of poor monitoring effect during the hydraulic fracturing process. It includes: obtaining the vibration signal of the target well during the hydraulic fracturing process; extracting multiple sub-signal segments of the vibration signal according to time sequence, and performing time-frequency analysis on each sub-signal segment using the short-time Fourier transform to obtain the time-frequency spectrogram of the vibration signal; obtaining the resonance energy amplitude statistical chart of the vibration signal; when the resonance energy amplitude statistical chart meets the preset conditions, it is determined that the hydraulic fracturing is successful, where the preset conditions include: after the average value of the resonance energy amplitude within the set duration changes from the first amplitude to the second amplitude, it remains within the set range centered on the third amplitude, and the second amplitude is higher than the first amplitude and the third amplitude. This application can intuitively and quickly evaluate the hydraulic fracturing process and realize the dynamic monitoring of the hydraulic fracturing process.

The invention discloses a gear fault detection method, system and device and a storage medium, and the method comprises the steps: obtaining a vibration signal and an impact signal of a gear, determining the frequency spectrum characteristics of a meshing frequency and each sideband frequency, and the frequency spectrum characteristics of a shaft rotation frequency, and determining whether the gear has traveling wave resonance or not according to the frequency spectrum characteristics of any sideband frequency, and determining whether the gear has a fault according to the spectrum characteristics of the shaft rotation frequency and the spectrum characteristics of the meshing frequency. If the frequency spectrum characteristic of the sideband frequency accords with the preset traveling wave resonance characteristic, it can be determined that the meshing state of the gear is abnormal, and it can be further determined that the traveling wave resonance mode of the gear is excited, that is, traveling wave resonance exists in the gear; according to the method, when the frequency spectrum characteristics of the shaft rotation frequency and the meshing frequency meet the preset fault characteristics, it is determined that the gear has the fault, by determining that the gear has traveling wave resonance and / or has the fault, the running state of the gear can be conveniently adjusted in time, it is avoided that the gear works under the rotating speed condition capable of causing poor resonance, and maintenance is conducted in time.