345 results about "Resonance effect" patented technology

The utility model discloses a compact and stable type automatic plate edge banding machine, which relates to the technical field of plate edge banding, and comprises a rack, a chain plate conveying belt, a guide pressing plate assembly, a pre-milling assembly, a gluing assembly, a plate joint strip assembly, a flush assembly, a fine trimming assembly, a scraper assembly and a polishing wheel. The compact and stable plate edge sealing equipment is formed, the independent and integrated gluing assembly and the integrated cavity are adopted, the coaxiality is good, the gluing uniformity cannot be affected, the front end and the tail end of a plate joint strip are cut off in a tracking mode, the cutter thrust is small, the stability is good, the upper portion and the lower portion of the plate joint strip are simultaneously refined, resonance influences are mutually reduced in an abutting mode, vibration is reduced, and the edge trimming precision is high; the fine adjustment spring is arranged, so that the distance between the fine trimming mechanism and the scraper mechanism can be finely adjusted, stable pressure is formed between the fine trimming mechanism and the scraper mechanism and the plate joint strip, the distance between the plate joint strip and a fine trimming cutter or a scraper is conveniently controlled, and fine trimming or scraping is more stable and better in effect.

The invention relates to the technical field of filters, in particular to a dual-mode resonator and a dual-mode filter. The dual-mode resonator comprises a metal cavity and a medium resonance body; the number of the metal cavities is two, and the two metal cavities are arranged on the two opposite sides of the medium resonance body respectively. The opening end of the metal cavity faces one end of the dielectric resonator; a conducting ring is arranged between the metal cavity and the dielectric resonant body, and the metal cavity and the conducting ring form a resonant cavity. The dual-mode filter comprises a first resonator and a second resonator; the first resonator is a dual-mode resonator; the first resonator and the second resonator are connected in series through a coupling structure. The conducting rings and the metal cavities are arranged on the two opposite sides of the dielectric resonance body, the conducting rings and the metal cavities form the resonance cavities, and the dual-mode resonance effect is achieved. The overall size is small, the space utilization rate is high, and production is easy.

The invention discloses a power load prediction and optimization method based on artificial intelligence, particularly relates to the field of power load prediction and optimization, is used for solving the problem of system stability caused by a nonlinear resonance effect, and comprises the following steps: preliminarily extracting key features of a power load signal through a multi-scale decomposition and mode recognition technology; and identifying a load mode which may cause system resonance. Two key indexes of frequency resonance intensity and time phase difference are emphatically utilized, the resonance risk of a load mode is comprehensively analyzed through a Bayesian network, the weight configuration of a high-risk mode is dynamically optimized in combination with a genetic algorithm, and the sensitivity and adaptability of the model to different resonance effects are improved. And then, the classified load modes are input into a deep neural network for multi-mode prediction fusion, and the model weight is adjusted in real time through a particle swarm optimization algorithm, so that the prediction precision and the operation stability of the system under a complex load condition are ensured, and a powerful guarantee is provided for the reliability of the power system.

The invention belongs to the technical field of organic light-emitting materials, and relates to a boron-containing polycyclic compound for an organic light-emitting material. According to the invention, aryl or heteroaryl is taken as a center, 2-3 boron atoms are introduced and form covalent bonds with atoms such as N, O, S and Se, and a rigid polycyclic compound is constructed. The compound provided by the invention is a boron-containing polycyclic compound with multiple resonance effects, can realize narrow-spectrum and high-color-purity luminescence, also has efficient TADF characteristics, and significantly improves the performance of OLED devices. Compared with the prior art, the compound has remarkable advantages in the aspects of molecular structure design, photoelectric property regulation and control, application range and the like, provides important technical support for development of new-generation high-performance OLED materials, and has wide market prospects and application potential.

The invention relates to an intelligent bedside instrument for relieving insomnia with assistance of sound waves. The intelligent bedside instrument comprises a sound wave adjusting module, a sound wave resonance relaxing system, a sleep state monitoring module and a personalized feedback system, the sound wave adjusting module sends specific sound waves to the sleep environment, and the sleep environment is automatically optimized based on sleep stage data monitored in real time by adjusting the frequency and intensity of the sound waves. The sound wave resonance relaxing system emits low-frequency sound waves with specific frequency into a bed head or a pillow according to the sleep state of a user, and the low-frequency sound waves are transmitted to the head and the body of the user through the resonance effect and used for relaxing tense muscles, stimulating deep nerves and helping the user to quickly relax and sleep. Through sound wave adjustment, resonance relaxation, accurate sleep state monitoring and a personalized feedback system, the sleep quality of a user is effectively improved, the user is helped to quickly enter deep sleep from a light sleep state, external interference is avoided, a sleep adjustment scheme is continuously optimized through intelligent analysis, and personalized requirements are met.

The invention discloses a novel phonon transistor pile, which belongs to the technical field of soil vibration reduction and comprises a pile tip, a pile body and a plurality of ABH-L.R. Combined vibration reduction units. The pile tip is located at the bottom end of the pile body. The ABH-L.R. Combined vibration reduction units are periodically distributed in the pile body from bottom to top along the height of the pile body and connected with the pile body through elastic materials. The ABH-L.R. Combined vibration reduction units are periodically arranged in the pile body, vibration is gathered in the center of the structure through the two-dimensional acoustic black hole plate, energy is dissipated through the energy dissipation characteristic of the constraint damping layer arranged in the center of the two-dimensional acoustic black hole plate and the local resonance effect generated by the L.R. Phononic crystal unit cells, the tubular pile can have the elastic wave band gap characteristic, and the elastic wave band gap vibration reduction effect is achieved. Low-frequency vertical vibration can be effectively filtered, and the influence of the vertical vibration on a building is restrained.

A composite structure hollow anti-resonance optical fiber disclosed by the present invention comprises an outer cladding layer, a doping layer and an anti-resonance layer which are sequentially arranged from outside to inside, the anti-resonance layer comprises a plurality of glass nested combination tubes which are uniformly distributed along the circumferential direction, are tangent to the doping layer and are arranged at intervals, and the plurality of glass nested combination tubes surround to form an air fiber core. The glass nested combined pipe comprises an outer nested pipe of a circular structure and an inner nested pipe of an oval structure arranged in the outer nested pipe. The short half axis of the inner nested pipe is arranged in the radial direction of the optical fiber, and the outer ring, away from the air fiber core, of the inner nested pipe is tangent to the inner ring, away from the air fiber core, of the outer nested pipe. According to the invention, a multi-layer nested structure is adopted, and the anti-resonance effect is optimized through the cooperation of the doping layer and the anti-resonance layer with a special structure.

The invention relates to the technical field of engineering structure vibration reduction, in particular to a pressure-resistant and low-frequency vibration reduction light sandwich cylindrical shell structure which is obtained by a unit cell circumferential array and a linear array. Each unit cell comprises an inner panel, an outer panel and a grid interlayer, and the inner panel, the outer panel and the grid interlayer are made of the same material. The Archimedes spiral resonance groove is accurately engraved in the inner panel, so that the local resonance effect is excited, and effective vibration attenuation is achieved. The structure has the characteristics of integration of light weight, vibration reduction and noise reduction functions, wide vibration reduction frequency range, good hydrostatic pressure resistance, easiness in manufacturing and the like. And meanwhile, certain sound absorption performance can be realized without changing external geometric characteristics of the structure and adding extra materials.

A system for millimeter RADAR object recognition and classification using sub-band frequency interference and resonance effects from primary targets signals and reflected signals from secondary target preferably in the form of Wideband Chaos Generating Material (WCGM) objects, preferably detecting frequency dependent absorbing material, frequency dependent resonance effects from the second and primary target objects, frequency signal resonance effects caused by water molecule dipole effects in different sugar solutions, impedance of material, shape of metamaterial, and interference effects due to combination of signal sources resulting in a wider range of transmitter and scanning frequency band for RADAR based interrogation of target objects. The RADAR system makes opportunistic use of traditionally seen problematic interference signals, as extra signal sources providing extended range and frequency bandwidth for frequency-based interrogation of target object signatures in a frequency-intensity plane, a frequency-polarization plane, and a frequency-phase shift plane for doppler effects.

The invention discloses a spiral resonance photoacoustic cell and an operation method, the spiral resonance photoacoustic cell comprises a gas chamber straight tube, a spiral tube, an optical fiber collimator and an optical fiber F-P sonic sensor, the two ends of the gas chamber straight tube are open, the two ends of the spiral tube are communicated with the gas chamber straight tube, an acoustic resonance point is formed at the center of the spiral tube, and the optical fiber F-P sonic sensor is arranged in the central area of the spiral tube; and the optical fiber collimator is arranged at one end of the air chamber straight pipe. The spiral pipe is wound outside the air chamber straight pipe, the spiral pipe is communicated with the air chamber straight pipe, the structural design of the spiral pipe enables the spiral pipe to form acoustic resonance at a specific frequency, and the optical fiber F-P sonic sensor obtains a photoacoustic signal; compared with a conventional resonance photoacoustic cell, the physical volume of the resonance photoacoustic cell is greatly compressed, and the system integration level is effectively improved. More importantly, under the condition that a compact appearance similar to that of a non-resonant photoacoustic cell is kept, the device amplifies the photoacoustic signal intensity by several times through an acoustic resonance effect, and the detection sensitivity and the signal-to-noise ratio of the system are remarkably improved.

Two-sided stepped three-line parallel resonators are arranged on the upper side and the lower side of a chamfer of a trapezoidal top-opened resonant cavity, and the wave beam broadening effect, the radiation impedance adjusting effect and the resonance effect of the two-sided stepped three-line parallel resonators on vertical polarization radiation are utilized; by combining the resonance, coupling, beam broadening and other effects of the trapezoidal top opening resonant cavity and the resonance of the two substrate integrated waveguide resonant cavities, wide beam end radiation with four-order filtering response is realized, and the vertical polarization work, the function fusion degree, the beam broadening degree, the frequency selectivity, the size and the cross polarization level can be considered.

The invention discloses a surface plasmon resonance imaging system for expanding a dynamic range through a multi-mode optical path, and relates to the technical field of microscopic imaging, a laser outputs a monochromatic and linearly polarized continuous wave beam, a first dynamic beam deflection device performs dynamic angle deflection adjustment on the continuous wave beam, a prism is used for providing a total reflection interface, and a second dynamic beam deflection device is used for performing dynamic angle deflection adjustment on the continuous wave beam. Exciting an evanescent wave; a surface plasma resonance effect is generated through interaction of the SPR detection chip and evanescent waves, and sample characteristics are detected; the flow cell provides a sample flow channel, so that a sample is in full contact with the surface of the SPR detection chip; the second dynamic light beam deflection device cooperatively adjusts the propagation direction of reflected light on the surface of the SPR detection chip, and the imaging detection device captures a high-spatial-resolution SPR image formed by the reflected light and transmits the image to the upper computer in real time for processing and analysis. According to the invention, the change of the resonance angle can be tracked in real time, and high-sensitivity and high-resolution monitoring of the dynamic process of biomolecule interaction is realized.

The invention discloses a bridgeless three-level induction heating device and a control method thereof, and relates to the field of induction heating. The bridgeless three-level induction heating device comprises a filtering module, a bridgeless three-level inversion module, an LLC resonance module and a coil module. The filtering module is connected with a power grid to filter high-frequency noise of power grid signals; the bridgeless three-level inversion module is connected with the filtering module so as to receive the power grid signal cleaned by the filtering module, and the bridgeless three-level inversion module converts the power grid signal into high-frequency alternating current and outputs the high-frequency alternating current; the bridgeless three-level inversion module does not comprise a rectifier bridge; the LLC resonance module is connected with the bridgeless three-level module so as to receive the high-frequency alternating current, and the LLC resonance module generates a resonance effect based on the high-frequency alternating current so as to realize energy transmission; the coil module is connected with the LLC resonance module, and the coil module generates an alternating current electromagnetic field based on the high-frequency alternating current to realize induction heating. By omitting a rectifier bridge, the circuit structure is simplified, and the loss in the energy conversion process is reduced.

The invention discloses a boron-nitrogen compound organic light-emitting material as well as a preparation method and application thereof. The boron-nitrogen compound organic light-emitting material is shown in a structural general formula (1): # imgabs0 #. The material is based on a TADF mechanism, a B-N condensed ring structure can realize multiple resonance effects, generated molecules have large rigid planes, and intermolecular interaction and concentration quenching effects can be controlled, so that an efficient and stable device is realized.

The invention discloses a focusing type acoustic streaming heat dissipation device facing a chip. The device belongs to the crossing field of ultrasonic technology and heat dissipation technology and is composed of a piezoelectric stack, an acoustic lens, a splitter plate, a base, a supporting rod, a copper electrode and the like. According to the device, geometric parameter configuration of the splitter plate, the piezoelectric stack and the acoustic lens is optimized, and a double-piezoelectric-plate stacked structure is adopted to enhance the ultrasonic resonance effect; high-frequency alternating voltage is applied to the copper electrodes at the two ends of the piezoelectric stack, high-frequency sound waves are excited through the inverse piezoelectric effect, and after the sound waves are focused through the sound lens, a gradient sound pressure field is formed in a cavity formed by the splitter plate and the piezoelectric stack; air molecules are driven to move directionally based on the acoustic streaming effect, so that air flow at an air inlet is accelerated by sound pressure to form high-flow-rate focusing jet flow at an air outlet, and targeted forced convection heat dissipation of a chip heat source is realized. According to the device, the ultrasonic technology and the heat dissipation technology are combined, the whole device is simple in structure, free of moving parts and low in noise, and various heat dissipation requirements can be met in an array mode.

A turbine box provided includes a main body containing a resonant silencing structure, which includes a resonance plate, a resonance chamber wall, and a silencing chamber formed by the resonance plate and the resonance chamber wall. A turbine blower is mounted in the silencing chamber installs, the silencing chamber is open to outside to receive external airflow, and under an action of the turbine blower, the external airflow is transformed into an airflow with a predetermined flow rate. The resonance plate defines a first hole and a second air hole located on opposite sides of the turbine blower; an airflow noise generated by the external airflow entering the silencing chamber, along with an vibration noise generated by the turbine blower, induce a resonance effect between the resonance plate and the resonance chamber wall to dampens both the airflow noise and the vibration noise.

The invention discloses an acoustic black hole structure and a vibration damping device.The acoustic black hole structure comprises an acoustic black hole body and a damping layer, the acoustic black hole body is provided with a uniform thickness area and an acoustic black hole area, the acoustic black hole area is provided with a plurality of grooves, the grooves are distributed from the first end to the second end of the acoustic black hole area, and the damping layer is arranged between the first end and the second end of the acoustic black hole area. The depths of the grooves are gradually increased in the direction from the first end to the second end, and the damping layer is arranged in the acoustic black hole area. By machining the groove in the acoustic black hole area, the local bending rigidity of the acoustic black hole body is changed, the bending wave speed of the acoustic black hole body is reduced, the acoustic black hole effect is achieved, due to the arrangement of the groove, the local resonance effect can be utilized, and then structural vibration suppression in the low-frequency range is achieved; the problem that a traditional acoustic black hole structure is poor in low-frequency-band vibration reduction effect is solved, in addition, thickness cutting of an acoustic black hole area of an original structure is avoided, and the manufacturing difficulty and the requirement for the precision of machining equipment are lowered.

The invention relates to the technical field of resonant pouring castings, in particular to a method for improving the homogeneity of castings in all directions based on resonant pouring, which comprises the following steps: preparing a mold / casting mold, setting resonant parameters, pouring molten metal, maintaining resonance and solidifying, and detecting the homogeneity. Through the resonance effect, molten metal mold filling is uniform, the size qualification rate is increased, meanwhile, grain refinement can be promoted, the isotropic performance uniformity and stability of a casting are remarkably improved, the internal defect rate is greatly reduced, the comprehensive yield is increased, and energy consumption and cost are reduced.

The invention provides an optical fiber sensor, a preparation method thereof and an optical fiber sensing system.The optical fiber sensor comprises an optical fiber microstructure with an evanescent wave leakage part and an induction sensing layer, the induction sensing layer is used for inducing the evanescent wave leakage part to generate a loss mode resonance effect and conducting combination or adsorption on a sensing target, the induction sensing layer is made of a UIO-66-NH2 material, and the induction sensing layer is combined to the outer surface of the evanescent wave leakage part through a chemical modification method; the induction sensing layer of the metal organic framework film is combined on the outer surface of the evanescent wave leakage part in the optical fiber microstructure through a chemical modification method, and the induction sensing layer can induce the evanescent wave leakage part to generate a loss mode resonance effect and can also combine or adsorb a sensing target. Therefore, a sensing film corresponding to the target detection object does not need to be coated during subsequent biological sensing or other sensing, and the manufacturing cost of the optical fiber sensor based on the LMR effect is further reduced.

The invention relates to the technical field of diaphragm pump aging test, and discloses a two-parameter intelligent closed-loop diaphragm pump aging test system and method. According to the method, a temperature spectrum and a vibration spectrum are obtained through fast Fourier transform, a frequency domain coherence coefficient is calculated to identify temperature-vibration coupling characteristics, a resonance frequency band and a drift trend thereof are identified in real time by adopting a spectrum peak tracking algorithm, and a multi-objective optimization function considering aging acceleration efficiency and resonance risk is constructed. And solving the optimal temperature stress amplitude and vibration stress frequency by using a particle swarm algorithm, generating a stress loading instruction avoiding a resonance area through a self-adaptive PID controller, and dynamically updating model parameters based on a closed-loop feedback mechanism. According to the invention, the problem of resonance effect amplification caused by traditional fixed frequency stress loading is solved, and refined adaptive stress control is realized.

The invention belongs to the technical field of SERS (Surface Enhanced Raman Scattering) detection, and relates to a preparation method of an Ag-Fe3O4 composite SERS substrate and application of the Ag-Fe3O4 composite SERS substrate in monitoring trace pollutants in water. Based on a plasma-semiconductor synergistic enhancement mechanism, cubic Fe3O4 nano particles with exposed {100} crystal faces are synthesized through a hydrothermal method, and the cubic Fe3O4 nano particles and Ag nano particles are subjected to ultrasonic-stirring to construct the Schottky heterojunction. The substrate creatively realizes dual-channel enhancement: the local surface plasmon resonance effect of Ag nanoparticles generates electromagnetic enhancement, the narrow band gap of Fe3O4 promotes photo-induced electrons to be transferred to Ag, an interface electric field is formed, and the polarizability of adsorption molecules is remarkably increased. When the probe is applied to detection of trace pollutants in a water body, the probe molecule RB is anchored on the surface of Fe3O4 through carboxyl, and the HOMO energy level of the probe molecule RB and the valence band top of Fe3O4 generate resonance charge transfer, so that the Raman cross section is improved. The detection limit of RB under 0.25 mW laser is increased by several orders of magnitude compared with that of a single Ag substrate.

The invention discloses a double-cantilever-beam piezoelectric vibration energy collector based on an annular steady state, which comprises a piezoelectric transducer, an elastic cantilever beam, a magnet and a base, after the piezoelectric transducer is mounted on the elastic cantilever beam to form a double-layer composite cantilever beam, the magnet is mounted at the free end of the double-layer composite cantilever beam, nonlinear coupling is carried out through repulsive magnetic force, and the piezoelectric transducer is connected with the base. The two-dimensional annular potential well structure with the adjustable potential well is formed, and the energy collector can easily trigger large-amplitude inter-well movement through the potential well structure. Through the nonlinear coupling induced internal resonance effect, inter-well energy transfer and two-dimensional potential well modulation are realized, and vibration energy can be efficiently captured in a broadband without a large amount of energy input or a complex structure. According to the design, the collection efficiency of low-frequency, low-intensity and multi-direction environment vibration energy in a wide working bandwidth is good.

The invention relates to the technical field of hyperbaric oxygen physiotherapy cabins, in particular to a terahertz wave micro hyperbaric oxygen physiotherapy cabin which comprises a cabin body, a door opening is formed in one face of the cabin body, a cabin top is installed at the top of the cabin body, and a door plate is hinged to the interior of the door opening through a hinge; the deep sea volcanic energy stone treatment device comprises a cabin, two groups of bed bodies are arranged in the cabin, the two groups of bed bodies are symmetrically mounted in the cabin, each bed body is of a hollow structure, and a plurality of terahertz wave generation modules are uniformly laid on the upper surface of each bed body through a support. The pelelith-based passive terahertz releaser formed after the pelelith-based passive terahertz releaser is combined with the ceramic matrix can continuously release terahertz waves with the frequency band of 0.1-12 THz, the vibration frequency is consistent with that of human cells, and the terahertz waves with the frequency band can repair biological enzyme and nucleic acid structure deformation caused by free radical attack and age increase through the biological resonance effect, so that the pelelith-based passive terahertz releaser can be used for repairing biological enzyme and nucleic acid structure deformation caused by free radical attack and age increase. The metabolic function is recovered from the cell molecule level, and the defect that a traditional oxygen cabin can only supply oxygen on the surface layer and cannot be deeply repaired is overcome.

The invention discloses a feedback control system of an ultrasonic flaw detector, and relates to the technical field of ultrasonic nondestructive detection.The system comprises a double-frequency transmitting module, a dynamic power control module, a signal acquisition module, a signal processing module and a feedback control module.The control system of the ultrasonic flaw detector adopts a double-frequency differential resonance detection method; two kinds of ultrasonic waves with specific frequency difference are emitted, the resonance effect at the defect is utilized to enhance echo signal characteristics, a double-frequency difference algorithm is matched, frequency deviation and amplitude change information of the defect can be accurately extracted, different types of defects can be effectively distinguished, and meanwhile, a dynamic power control mechanism can be used for controlling the detection accuracy according to the thickness, the structure and the material parameters of a detected object. The transmitting power of the double-frequency ultrasonic waves is adjusted in real time, it is ensured that the ultrasonic waves can reach the defect position in the optimal energy state under different working conditions, the resonance effect is enhanced, and therefore the system can achieve high-precision detection on tiny defects.

The invention relates to a vibration damping and buffering protection superstructure based on local resonance and compression-torsion coupling. The vibration damping and buffering protection superstructure comprises a middle circular ring and two compression-torsion pipes, wherein the two compression-torsion pipes are symmetrically arranged with the middle circular ring as the center in a chiral mode. Each pressure torsion pipe comprises an outer circular ring and a connecting rod; the outer circular ring and the middle circular ring are coaxially arranged; two ends of the connecting rod are respectively connected to the middle circular ring and the outer circular ring; the plurality of connecting rods are uniformly arranged along the middle circular ring; and a resonance ball is arranged on each connecting rod in a penetrating manner. When vibration or impact invasion occurs, the superstructure generates a local resonance effect and a compression-torsion coupling mechanism, and the wave energy dissipation efficiency is better and more stable. Through the chiral symmetric pressure torsion tube, coupling of longitudinal and torsional deformation modes is realized, and polarization of longitudinal waves and torsional waves is promoted. Therefore, the polarized band gap can be induced to block longitudinal waves. Meanwhile, the resonance balls on the connecting rods generate a remarkable local resonance effect, and wave energy is dissipated through local resonance. According to the invention, impact protection and vibration isolation performance can be synergistically improved.

The invention discloses a police unmanned aerial vehicle sound wave dispersing method, an unmanned aerial vehicle, a product and a medium. The method comprises the steps that when it is detected that tourists exist in a dispersing area of an ancient wall, the positions and the number of the tourists are obtained, the center-of-gravity position of the tourist group is calculated, and an unmanned aerial vehicle is adjusted to the position, away from one side of the ancient wall, of the connecting line of the center-of-gravity and the ancient wall; the connecting line of the position of the unmanned aerial vehicle and the gravity center position serves as the sound wave emission direction, and sound wave emission power and period are dynamically adjusted according to the tourist number for dispersion; and acquiring sound vibration response data of the ancient wall under the action of sound waves, and if a harmful frequency component consistent with the dangerous resonance frequency is detected, synchronously transmitting interference sound waves with the same frequency and power but opposite phases to counteract potential resonance influence. By implementing the technical scheme provided by the invention, the dual requirements of tourist dispersion and ancient building protection are considered.

The invention provides a tunnel micro-seismic blasting targeted protection control method and device, and relates to the technical field of tunnel blasting, and the method comprises the steps: obtaining the distance between a protected building and a tunnel, and building a blasting vibration wave propagation model based on the distance and an initial attenuation coefficient; calculating predicted vibration data of seismic waves generated by each blasting section in a preset blasting scheme, wherein the seismic waves are transmitted to the protected building; taking the minimum theoretical peak vibration velocity of the protected building as a target, and calculating by adopting a numerical optimization algorithm to obtain a non-equal-difference detonation delay sequence of each blasting section; when the detonating time interval of the adjacent detonating sections is not equal to the integral multiple of the inherent main earthquake period, detonating is carried out according to the non-equal-difference detonating delay sequence; and comparing the actually measured vibration data with the predicted vibration data, and adjusting the attenuation coefficient based on the comparison result, thereby effectively preventing the resonance effect, preventing the vibration energy from being amplified, and ensuring the construction safety.

------ Enclosure configured to generate sound with low spatial decay and no resonance effect in a reverberant medium The invention relates to an enclosure (1), comprising: a front face (2); a rear face (3); an enclosure (4) connecting the front face (2) to the rear face (3); at least one electromagnetic actuator (6) mechanically connected to the front face (2) and configured to generate vibrations in the front face (2) from a control signal; at least one solid core (7), extending between the front face (2) and the rear face (3), such that the core or each core (7) transmits vibrations between the front face (2) and the rear face (3); and control electronics configured to deliver control signals to the electromagnetic actuator (6) or to each electromagnetic actuator (6) so as to generate a sound by vibrating the front face (2), at least one core (7), the casing (4) and the rear face (3).Figure to be published: Figure 4.

The embodiment of the invention relates to the technical field of devices for preventing or reducing noise, in particular to a rubber cell element structure and a vibration reduction and sound insulation assembly. According to the rubber cell element structure provided by the invention, due to the fact that the resonant frequencies of the cell element rings with different sizes are different, each first cell element ring is arranged in each second cell element ring, and the first cell element rings and the second cell element rings are concentrically arranged, so that vibration and noise reduction of noise with different frequencies are realized; a plurality of first cell element rings and a plurality of second cell element rings are arranged on a substrate, the substrate is supported by the cell element rings, the second cell element rings are arranged adjacent to one another, the cell element rings are arranged in a limited space as many as possible, and therefore the supporting performance of the substrate is improved; the first cell element ring and the second cell element ring are arranged to be of a structure capable of generating the local resonance effect to form the band gap, so that transmission of vibration noise in the structure is restrained, the restraining capacity of the structure for multi-band noise is improved, and the treatment requirement for different-frequency noise is comprehensively met.

The invention discloses an infrared flaw detection device and method based on convective heat metamaterial temperature field scattering resonance, and belongs to the technical field of infrared flaw detection. A convection ring structure rotating at a constant speed is excited by using a time-harmonic heat source, a sample ring is arranged on the upper surface of the convection ring, and when the sample has no defect, resonance peaks of a temperature field on the upper surface of the sample can be observed by means of an infrared camera through frequency sweeping of the excitation heat source; when the sample has defects, exciting at the frequency, and observing that the amplitude response of the temperature field has a linear relation with the size of the defects. The device is based on the scattering resonance effect of the convective heat metamaterial and the time-harmonic heat source, and the response sensitivity of temperature amplitude to defects can be effectively improved, so that the device can be used for realizing high-sensitivity infrared nondestructive inspection.