41 results about "Wave resonance" patented technology

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 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 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.

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 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 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 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 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.

The invention provides a preparation method of a crack-free high-density high-toughness base alloy component formed by acoustic resonance assisted LED (Light Emitting Diode), which comprises the following steps: carrying out ultrasonic dispersion treatment on nano WC (Wolfram Carbide) particles, and then drying to obtain the nano WC particles subjected to ultrasonic dispersion treatment; micron-sized base alloy powder and nano WC particles subjected to ultrasonic dispersion treatment are evenly mixed, so that the surface of the micron-sized base alloy powder is evenly wrapped with the nano WC particles, and composite powder is obtained; and the composite powder is subjected to laser melting deposition through laser directional energy deposition equipment, and sound wave resonance treatment is conducted on high-temperature melt in the deposition process. The invention further provides a crack-free high-density high-toughness base alloy component prepared through the method. According to the method, the crack-free high-density high-toughness base alloy component can be prepared through acoustic resonance assisted LDED forming, and the method is suitable for high-performance integrated manufacturing of aero-engine hot end key components.

The invention provides an aviation gear resonance prediction and vibration absorption method based on a traveling wave resonance theory, and relates to the technical field of aviation gear vibration noise. According to the method, based on the gear traveling wave resonance principle and traveling wave resonance characteristics, test analysis is carried out on the aspects of gear structure vibration dynamic characteristics, loading, strength and the like aiming at the phenomenon that the radial plate of the high-speed thin-radial-plate straight gear is fractured, and the vibration characteristics of the thin-radial-plate straight gear during traveling wave resonance are described; a theoretical formula of composite traveling wave resonance is deduced on the basis of experimental data and an existing basic traveling wave resonance theory, a vibration characteristic rule of the composite traveling wave resonance is further revealed by using the formula in a deep level, finally, improvement suggestions are put forward for the structure of the straight gear, and the composite traveling wave resonance formula of the thin radial plate straight gear is verified again.

The application discloses a low-profile reflective array antenna with gain filtering characteristics and dual linear polarization independent control. The application comprises a planar reflective array composed of a plurality of reflective units, a horn antenna; the reflective unit comprises a magnetic electric dipole loaded with a split ring resonator, an x polarization feeding part and a y polarization feeding part, each feeding part comprises an independent feeding arm and an open metal microstrip line patch, the feeding arm and the open metal microstrip line patch are connected through a metallized via hole, the energy received by the magnetic electric dipole can be coupled to the feeding arm within the working band, the energy is transmitted from the feeding arm to the open metal microstrip line patch through the metallized via hole, and reflection occurs at the open metal microstrip line patch, so the reflection phase can be changed by adjusting the length of the open metal microstrip line patch. At a low frequency, a radiation zero point is introduced by using the characteristics of the magnetic electric dipole, and at a high frequency, a radiation zero point is introduced by using the half-wave resonance characteristics of the split ring resonator, so that the filtering characteristics are realized.

The invention relates to a pressure wave resonance excitation open type full-bore lower casing floater and an opening method, the floater comprises a pressure oscillation generating device, a casing string and a floating coupling, and the pressure oscillation generating device is communicated with the casing string through a pipeline; the floating coupling is mounted on the casing string, and two ends of the floating coupling are respectively communicated with the casing string; a glass plate is fixedly installed in the floating coupling, and the space in the floating coupling is divided into two independent parts through the glass plate. The opening method is simple and reasonable in design, the glass plate can be exploded and broken from the inside by energy generated by oscillation wave resonance emitted by the pressure oscillation generating device, the whole glass plate is broken in an explosion mode, chippings are extremely small and completely broken, no cavity is generated in the middle, the chippings do not block a casing pipe and other downhole tools, and the service life of the casing pipe is prolonged. The problems that according to a traditional casing running floater, a mud replacing rubber plug is hung and clamped, opening is conducted in advance, opening cannot be conducted, chippings are large after opening is broken, and well cementation is complex due to blocking of other underground tools are effectively solved.

This invention provides a photovoltaic module cleaning system and method based on multi-band acoustic wave resonance, relating to the field of photovoltaic power generation cleaning technology. The system includes an acoustic wave generating array, an infrared thermal imager, a microphone array, and a controller. The acoustic wave generating array, infrared thermal imager, and microphone array are all electrically connected to the controller. The infrared thermal imager is used to monitor the temperature distribution on the surface of the photovoltaic module, and the microphone array is used to monitor the acoustic wave distribution on the surface of the photovoltaic module. The controller controls the acoustic wave generating array to emit multi-band acoustic waves with frequencies ranging from low to high onto the surface of the photovoltaic module to excite dust particles of different sizes on the surface of the photovoltaic module to resonate. The controller also controls the acoustic wave parameters of the multi-band acoustic waves according to the temperature distribution and / or acoustic wave distribution. Based on the principle of multi-band acoustic wave resonance, this invention can achieve efficient, non-destructive, and zero-water-consumption cleaning of photovoltaic modules, reducing the operation and maintenance costs of photovoltaic power plants.

The application relates to the technical field of biological wave resonance, and provides a deviation analysis method and system based on biological wave resonance, so as to solve the problems of low precision and poor anti-interference capability of biological wave resonance abnormality detection in the prior art. The method comprises the following steps: collecting electrocardiosignal, electroencephalogram signal and micro-deformation data on the surface of a living body, and jointly aligning the signal data in a time-frequency domain; dynamically suppressing interference frequency bands of the electrocardiosignal and the electroencephalogram signal after joint alignment respectively; fusing the electrocardiosignal, the electroencephalogram signal after suppression and the micro-deformation data after joint alignment, to generate a fusion result; determining a deviation feature of the fusion result relative to a preset reference state by using convolution operation; and generating a biological wave resonance deviation analysis report of whether the biological wave resonance is abnormal according to the continuous length and the spatial distribution range of the deviation feature in a time domain dimension. The application improves the precision and the anti-interference capability of biological wave resonance abnormality detection.

The invention provides an aviation high-speed thin radial plate straight gear composite traveling wave resonance experiment and analysis method, and relates to the technical field of aviation gear vibration noise. The method comprises the following steps: firstly, carrying out an aero-engine accessory casing booster pump gear shaft bull gear traveling wave resonance characteristic experiment; then, based on an aero-engine accessory casing booster pump gear shaft bull gear traveling wave resonance characteristic experiment, the rotating speed of the engine is adjusted according to the slow sweeping process, and the traveling wave resonance characteristic of the accessory casing booster pump gear shaft bull gear is tested based on noise and stress parameters; determining composite traveling wave resonance and frequency of a bull gear of a gear shaft of the booster pump of the accessory casing at a specific engine rotating speed; the composite traveling wave resonance is the superposition of two different pitch diameter type traveling wave resonances of the gear shaft bull gear of the booster pump of the accessory casing at a specific engine rotating speed. According to the method, the dynamic response characteristic and the stress distribution rule of the traveling wave resonance characteristic of the thin radial plate straight gear under different resonance working conditions are disclosed.

A sound wave resonator defines a resonance preferred area, the resonance preferred area comprises a substrate, a buffer film, a reflection structure, a lower electrode, a crystal film and an upper electrode which are stacked with one another, the buffer film comprises a flat area overlapped on the resonance preferred area, and the roughness of the surface of the flat area is lower than 5nm.

Embodiments of the present application provide a three-mode patch antenna and an electronic device, the three-mode patch antenna comprising: a reference ground; a patch, the patch comprising a first side and a corner opposite to the first side, the first side being electrically connected to the reference ground, the patch being provided with a feed point, the feed point being close to the corner, the feed point being used for feeding an excitation signal; wherein the patch generates a first resonance, a second resonance and a third resonance when transmitting the excitation signal, the first resonance is a quarter-wavelength resonance, the second resonance is a half-wave resonance, and the third resonance comprises a ring resonance and a three-quarter-wavelength resonance. The three-mode patch antenna provided by the embodiments of the present application can realize three-mode operation by designing the position of the feed point, so that the feed point is close to the corner, thereby expanding the antenna bandwidth and improving the communication performance.

The utility model belongs to the technical field of building curtain walls, and particularly relates to a building sound insulation curtain wall structure which comprises a supporting frame, the right end of the supporting frame is fixedly connected with a decoration panel, the inner wall of the supporting frame is fixedly connected with a first sound absorption layer, the first sound absorption layer makes contact with the decoration panel, the inner wall of the supporting frame is fixedly connected with a second sound absorption layer, and the second sound absorption layer makes contact with the decoration panel. The second sound absorption layer makes contact with the first sound absorption layer, the inner wall of the supporting frame is fixedly connected with a noise reduction layer, the noise reduction layer makes contact with the second sound absorption layer, the outer side of the noise reduction layer is fixedly sleeved with a blocking layer, and the blocking layer is fixedly connected with the supporting frame. Through the arrangement of the first sound absorption layer and the second sound absorption layer, sound wave resonance can be destroyed, broadband noise can be absorbed, under the action of the noise reduction layer, structural vibration sound transmission is restrained, under the action of the blocking layer, the good sound insulation sealing characteristic can be formed, transmission of remaining sound waves can be blocked, and therefore the good sound insulation effect of the building curtain wall can be guaranteed.

The application discloses a kind of without bottom electrode transverse excitation thickness shear type high overtone bulk acoustic wave resonator, including low acoustic loss substrate, piezoelectric film layer being arranged on substrate and the transverse electrode structure being arranged on the top of piezoelectric film layer. Among them, piezoelectric film layer and substrate do not set any metal electrode layer between them, and form continuous acoustic impedance matching interface.Working, through transverse electrode in piezoelectric layer generates plane direction electric field, excite thickness shear vibration mode, make acoustic wave propagate along thickness direction and form multiple reflection high overtone standing wave resonance in substrate.Compared with traditional structure, the application completely eliminates the acoustic impedance mismatch problem introduced by bottom electrode, significantly improves acoustic energy transmission efficiency and quality factor, obtains stable frequency spectrum comb response, simultaneously realizes the flexible regulation of modal volume by electrode design.The structure process is simple, compatible with standard semiconductor process, suitable for radio frequency filter, multiplexer and microwave acoustic system.

The invention provides an electromagnetic energy wave resonance activated cell heating system and method, and the method comprises the steps: obtaining the impedance distribution data of a multi-layer tissue structure through a pre-established biological tissue layer model, carrying out the analysis of the impedance difference at the tissue layer interface, determining the electromagnetic energy reflection loss range at each interface, and obtaining the electromagnetic energy wave resonance activated cell heating. Obtaining a distribution characteristic graph reflecting impedance change; adjusting the emission frequency and the phase parameter of the electromagnetic energy wave through the distribution characteristic reflecting the scattering degree, reducing the scattering influence of the electromagnetic energy wave in a tissue layer, and performing energy suppression processing on the heat effect of a non-target area to obtain an adjusted waveform parameter; and for the focusing correction scheme, acquiring energy threshold data required by activation of the deep target cells, analyzing the distribution uniformity of the electromagnetic energy in the target region, determining optimal parameter configuration for realizing accurate focusing, and generating a final electromagnetic energy wave emission scheme.

An authentication apparatus is provided. The authentication apparatus has a dielectric carrier and a plurality of millimeter wave resonance structures on or in the dielectric carrier, wherein at least one first millimeter wave resonance structure of the millimeter wave resonance structures has a first resonant frequency, which has a first resonance strength when irradiated at the first resonant frequency, and wherein at least one second millimeter wave resonance structure of the millimeter wave resonance structures has a second resonant frequency, which has a second resonance strength, which is equal to the first resonance strength or is different from it, when irradiated at the second resonant frequency.

The application provides an antenna assembly, a main radiator comprising a first free end, a second free end, a feed point and a tuning point; a parasitic radiator comprising a third free end and a first grounding point, the third free end and the second free end being a coupling gap; a signal source being electrically connected to the feed point, the signal source being used to excite a first resonance mode on the main radiator to support a first frequency band, and the signal source being used to excite a second resonance mode on the parasitic radiator to support a second frequency band and to excite a target high-order mode on the main radiator to support the second frequency band, the target high-order mode and the second resonance mode together forming a double-wave resonance to support the second frequency band; one end of a switch switching circuit being electrically connected to the tuning point, and the other end being grounded; the switch switching circuit being used to switch a sub-frequency band of the first frequency band, and the second frequency band supported by the second resonance mode and the target high-order mode remaining constant when the sub-frequency band of the first frequency band is switched. The application can improve the performance of the antenna and save the occupied space.

The application relates to the technical field of biological wave resonance dynamic induction, and provides a biological information targeting processing method and system based on biological wave resonance dynamic induction, so as to solve the problems of low space-time accuracy and poor dynamic adaptability of biological energy targeting regulation in the prior art. The method comprises the following steps: acquiring dynamic change data of a biological surface temperature field, combining a heat conduction model to calculate an internal heat source diffusion rate, and synchronously correlating modeling to generate resonance energy distribution characteristics; based on the real-time matching relationship between the thermodynamic fluctuation amplitude change rate and the biological wave resonance frequency offset in the characteristics, an adaptive energy output sequence is dynamically generated; directional energy stimulation is implemented on the biological surface, so that the energy density distribution of the stimulation result can track the change of the heat source diffusion rate in real time, the resonance frequency band can automatically match the biological wave inherent frequency band, and closed-loop targeting regulation of dynamic coupling of biological wave phase delay and thermodynamic parameters is realized. The application improves the space-time accuracy and dynamic adaptability of biological energy targeting regulation.

The invention relates to an electromagnetic wave resonance absorption type non-magnetic flow sensor. The sensor comprises a signal acquisition wheel which is positioned in a glass cover and rotates along with a signal acquisition pointer shaft, a resonance absorption sheet fixed on the signal acquisition wheel, and a sensor head positioned outside the glass cover, the sensor head comprises an annular excitation coil and a receiving coil on the inner side, and the excitation frequency is equal to or close to the resonant frequency of the resonance absorption sheet. When the resonance absorption sheet rotates to the action area of the receiving coil, due to resonance absorption, the output of the receiving coil generates significant amplitude change, and thus pulses corresponding to the number of turns of the rotation angle are output. The resonance absorption sheet adopts an FPC (Flexible Printed Circuit) or PCB (Printed Circuit Board) integrated LC parallel resonance structure, and the signal acquisition wheel is provided with a glue pouring shallow slot to realize waterproof packaging; the sensor head is a multi-layer PCB coil, and a receiving coil can be distributed in a three-phase 120-degree mode. According to the scheme, the effective signal and anti-interference capability is remarkably improved, low-power-consumption sampling of intermittent excitation is supported, and the method is suitable for non-magnetic signal obtaining of meters such as mechanical water meters.

The embodiment of the invention discloses a new energy grid-connected harmonic suppression regulation and control method and device, electronic equipment and a medium. A specific embodiment of the method comprises the following steps: performing variable window Fourier transform on a power instantaneous value sequence set, and then performing impedance compensation to obtain a compensated power harmonic spectrum diagram set; performing critical point identification on the new energy grid-connected power region to obtain a harmonic resonance critical point set; performing early warning grade division on the harmonic resonance critical point set to obtain an early warning grade critical point set; performing harmonic time sequence prediction on the compensated power harmonic spectrogram and the inverter power information to obtain a harmonic prediction amplitude oscillogram; and performing harmonic suppression control on the early warning grade critical point to obtain grid-connected harmonic regulation and control information, and performing equipment regulation and control processing on the power equipment. According to the embodiment, the early warning accuracy of the harmonic resonance risk and the efficiency of suppressing the harmonic resonance can be improved, the equipment delay is reduced, the safety of the new energy grid-connected equipment is improved, and the power loss is reduced.

The invention relates to the technical field of semiconductors, in particular to a packaging structure of an elastic wave filter and a forming method of the packaging structure. The elastic wave filter comprises a device substrate, the device substrate comprises a first surface and a second surface, the second surface is close to and faces a packaging substrate, and the first surface comprises a resonance area, a non-resonance area and a bonding pad area; a plurality of elastic wave resonance structures located in the resonance area; the plurality of first bonding pads are positioned in the bonding pad area; the supporting layer is located on the first surface and located in the non-resonance area; the top cover layer is located on the supporting layer and located on the resonance area and the non-resonance area; a plurality of cavities, wherein the cavities correspond to at least one elastic wave resonance structure; the plurality of metal bonding wires are used for electrically connecting the packaging substrate and the elastic wave filter; and a plastic packaging layer. According to the invention, a flip-chip technology and a ball mounting technology are not needed, the risk of material invasion does not exist during plastic packaging, the overall difficulty of a packaging technology is reduced, and the yield of products is improved.

It suppresses changes in the resonant frequency of electromagnetic waves, thereby efficiently absorbing them. [Solution] In the electromagnetic wave absorber 1, incident electromagnetic waves incident on multiple openings 11 of the first metal layer 10 pass through the dielectric 30. Multiple inclined surfaces 22a, 22b retroreflect the incident electromagnetic waves D1 that have passed through the dielectric 30. The reflected electromagnetic waves D3 retroreflected by the multiple inclined surfaces 22a, 22b pass through the dielectric 30 and are then reflected by the first metal layer 10. These reflected electromagnetic waves D4 pass through the dielectric 30 and are then retroreflected by the multiple inclined surfaces 22a, 22b. These retroreflected electromagnetic waves D6 pass through the dielectric 30 and are then reflected by the first metal layer 10. The electromagnetic waves resonate when the wavefront of these reflected electromagnetic waves D7 coincides with the wavefront of the incident electromagnetic wave D1. The dielectric 30 absorbs the electromagnetic waves by converting them into heat through dielectric loss when the electromagnetic waves are in a resonant state.