16 results about "Acoustic resonance" patented technology

This invention discloses an intelligent detection system and method for the bonding quality of exterior wall insulation layers in building construction, belonging to the field of intelligent bonding quality detection technology. It includes: an image acquisition and preprocessing module, a dynamic threshold image segmentation and defect judgment module, a sequential image panoramic stitching and global integration module, and a defect grading and quantitative evaluation module. This invention simultaneously acquires visible light and infrared thermal imaging images and performs preprocessing to obtain single-frame and inspection sequence images. Based on the insulation layer thickness, it selects whether to dynamically update the segmentation threshold, and combines the acoustic resonance frequency offset to determine whether to correct the local threshold before conducting defect detection. It fuses and stitches overlapping areas of the sequential images to generate a panoramic image, and maps the defect detection results to achieve global detection. Based on the defect distribution density, it completes multi-level defect grading, ultimately realizing the detection of exterior wall insulation bonding quality.

This application relates to the field of detection technology, and discloses a method, apparatus, electronic device, and storage medium for detecting a target object. The method includes: acquiring a target magnetic field distribution sequence and a target impact acoustic wave flow of the target object to be detected; extracting a target magnetic field response fingerprint from the target magnetic field distribution sequence and extracting target acoustic resonance frequency features from the target impact acoustic wave flow; comparing the target magnetic field response fingerprint and target acoustic resonance frequency features with preset benchmark feature data to obtain a physical feature consistency comparison score; and determining the detection result of the target object based on the physical feature consistency score. This method can be applied to financial insurance business scenarios such as auto insurance claims risk control, enabling rapid on-site non-destructive verification, effectively identifying differences in the internal material structure of the target object, reducing disassembly and inspection costs, and improving detection accuracy.

This invention belongs to the field of fluid-structure interaction dynamics analysis technology, and specifically discloses a method and system for analyzing the dynamic characteristics of an acoustic-frequency resonant hybrid system. The method includes: introducing an external excitation force vector and a fluid feedback force vector into the dynamic control equations of the acoustic-frequency resonant hybrid system to form coupled dynamic equations; numerically characterizing the fluid feedback force using a multi-harmonic fitting method to obtain a fluid force model; based on the fluid force model, obtaining the dominant frequency component of the fluid force and mapping it equivalently to an additional mass parameter and an equivalent damping parameter; then fitting the optimal functional form of the additional mass parameter and the equivalent damping parameter relative to the excitation acceleration; updating the coupled dynamic equations based on the optimal functional form to achieve dynamic characteristic analysis under different excitation acceleration conditions. This invention can accurately analyze the dynamic characteristics of an acoustic-frequency resonant hybrid system under high-acceleration vibration environments to address nonlinear dynamic problems induced by fluid-structure interaction.

The present application relates to the technical field of transformer on-line monitoring, in particular to a transformer oil quality analysis photoacoustic spectrum detection system and method. The method extracts transformer oil sample through a circulating oil pump, and removes dissolved gas in the oil by using an oil-gas separation membrane assembly under a negative pressure environment. After preheating by a spiral coil, the removed gas is filtered and homogenized by a micro-porous membrane structure, and then sent into a resonant photoacoustic cell. A main controller dynamically adjusts a laser modulation frequency according to a gas flow rate, so as to maintain the stability of an acoustic resonance field in the resonant photoacoustic cell. The modulation laser excites the measured gas to generate a photoacoustic signal, and after collection and processing, the concentration of the multi-component dissolved gas is decoupled and calculated, and the transformer fault early warning is carried out accordingly. The present application has the advantages of stable degassing, high detection sensitivity, strong anti-interference ability, and suitability for multi-component continuous detection.

The invention relates to an air intake system used in industrial generators and comprising an air intake pocket (20) located in a generator enclosure (10). The invention is characterized in that; it comprises a quarter-wave resonator (50) located in the air intake pocket (20), which directs, within the generator system, the flow of fresh air drawn into the system and / or hot air leaving the system, creating acoustic resonance at a certain frequency so as to ensure suppressing unwanted frequencies and reducing low-frequency noise, and a side air duct (60) forming the air passage in the air intake pocket (20) in the space between the air intake pocket (20) and the quarter-wave resonator (50).

This invention relates to the field of Internet of Things (IoT) and communication sensing technology for medical devices, and particularly to a centralized management method and system for anesthesia equipment based on IoT. The method includes the following steps: S1: Frequency division multiplexing of high-frequency communication and low-frequency acoustic envelopes to control the array to transmit a composite optical signal; S2: Identifying the end-expiratory phase based on mechanical vibration rhythm to generate a timing gating; S3: Responding to the gating to open the photoacoustic resonant cavity to receive the optical signal; S4: Filtering and separating demodulated data and photoacoustic pressure, extracting base station coordinates and inverting leakage concentration; S5: Optimizing beamforming based on pressure amplitude and bit error rate, and generating a ledger by combining coordinates and concentration. In this invention, by frequency division multiplexing and fusing the high-frequency communication envelope and the low-frequency acoustic excitation envelope, and utilizing a light-emitting diode array to simultaneously achieve downlink communication and photoacoustic sensing excitation, the problem of electromagnetic interference easily caused by traditional RF IoT solutions in the operating room environment is solved.

The utility model provides a kind of high-throughput nanometer suspension agent eutectic preparation equipment based on acoustic resonance, mainly relates to drug nanocrystallization and eutectic preparation technical field.A kind of high-throughput nanometer suspension agent eutectic preparation equipment based on acoustic resonance, including mixing container, sealing cover, acoustic resonance system, the sealing cover shape is compatible with mixing container, several recessed holes are opened in the mixing container, several convex columns are equipped on the sealing cover, the convex column lateral wall is equipped with annular sealing ring, the acoustic resonance system includes resonance platform and fixing device, supporting device, the resonance platform includes vibration table surface, drive machine, the drive machine is fixedly arranged at resonance table surface bottom.The utility model has the beneficial effect that: the equipment composition is simple, low in cost, can realize the preparation of single batch multiple groups of drug nanometer suspension agent or eutectic, is conducive to the efficient screening of nanometer suspension agent stabilizer and eutectic formation.

In an embodiment, a liquid ejection head includes a nozzle plate, a pressure chamber, an actuator, and a drive circuit. The actuator varies a volume of the pressure chamber in response to a driving signal from the drive circuit. The driving signal includes an ejection waveform for ejecting liquid from a nozzle and a cancellation waveform for suppressing residual oscillation after ejection of the liquid. The ejection waveform includes voltage changes in stages and the cancellation waveform includes two waveform portions for suppressing residual oscillations and higher harmonic acoustic resonance frequencies.

This utility model relates to an integrated photovoltaic and sound-absorbing substrate, belonging to the field of sound absorption. The substrate, along its thickness direction, comprises: a panel; a double-layer sound-absorbing material layer, including a first sound-absorbing layer, a second sound-absorbing layer, and an adhesive film layer, the adhesive film layer being sandwiched between the first and second sound-absorbing layers, both of which are irregularly perforated sound-absorbing material layers; a supporting base, which has an internal cavity structure, the cavity structure and the irregular perforations forming an acoustic resonance cavity; and a back plate, fixedly connected to the supporting base. When the panel is a microporous sound-absorbing plate, the back plate is a solar panel; when the panel is a solar panel, the back plate is a microporous sound-absorbing plate, and the solar panel and the sound-absorbing substrate are coupled through a thermally conductive adhesive layer. This integrated photovoltaic and sound-absorbing substrate, by constructing a three-dimensional acoustic system of a microporous sound-absorbing plate, a double-layer sound absorber, and a cavity base, achieves broadband sound wave coverage and prevents interface delamination between the solar panel and the sound-absorbing substrate.

This invention belongs to the field of photoacoustic sensing and integrated photonics technology, and specifically relates to an on-chip photoacoustic gas sensing device and method based on axial acoustic resonance enhancement. The device includes a substrate, on the upper surface of which an optical waveguide module is disposed. The input end of the optical waveguide module is connected to one end of an optical input port, and the other end of the optical input port is connected to the output end of a laser controller. A photoacoustic detection module is disposed parallel above the optical waveguide module. A miniature gas cylinder is disposed between the photoacoustic detection module and the optical waveguide module, and a target gas is disposed within the miniature gas cylinder. This invention achieves spatial energy accumulation and enhancement of the sound pressure signal by distributing the miniature gas cylinder between the optical waveguide module and the photoacoustic detection module, and by matching the axial dimension of the miniature gas cylinder to the operating frequency of the photoacoustic detection module. This results in a stable axial acoustic standing wave mode being formed within the miniature gas cylinder, thereby improving the gas detection sensitivity.

The application provides a multi-angle combined mechanical end vibration suppression method, analyzes the source of mechanical end vibration, identifies the vibration caused by input signal noise, resonance excitation and signal and system characteristic mismatch; calculates the inherent frequency of a multi-modal mechanical system; performs smoothing processing on the input signal to filter out Gaussian white noise; designs a notch filter to remove the frequency components in the input signal that coincide with or are close to the inherent frequency; and connects an EI shaper and a ZVD shaper in series to normalize and reconstruct the input signal. The application comprehensively suppresses mechanical end vibration from multiple angles, can achieve 30%-40% end vibration suppression effect under the working condition containing a large amount of random noise and resonance frequency, reduces the vibration amplitude at the resonance frequency by nearly 50%, has the advantages of fast response speed and strong robustness, and is suitable for multi-modal mechanical systems such as industrial robot arms, multi-link actuators and precision numerical control machining equipment.

This invention relates to the field of magnetron sputtering coating monitoring and control technology, and more specifically, to an intelligent monitoring method for the uniformity of magnetron sputtering coatings on solar collector tubes. The method includes: constructing a transmission-type acousto-optic caustic monitoring environment; acquiring caustic images and inverting them to obtain transient acoustic pressure distribution; performing singularity analysis on the pressure distribution using the box-counting method to calculate the microscopic inhomogeneity index of the coating layer; generating airflow pulse commands by combining the real-time acoustic resonance frequency of the inter-tube cavity; and driving a standing wave gas knife to inject pulsed gas into the inter-tube gap, using the wave interference principle to block the parasitic hollow cathode effect. This invention, through acousto-optic inversion and fractal topology filtering, achieves precise quantification and online closed-loop suppression of invisible micro-arc discharge lattice damage, significantly improving coating uniformity.

In an embodiment, a liquid ejection head includes a nozzle plate, a pressure chamber, an actuator, and a drive circuit. The actuator varies a volume of the pressure chamber in response to a driving signal from the drive circuit. The driving signal includes an ejection waveform for ejecting liquid from a nozzle and a cancellation waveform for suppressing residual oscillation after ejection of the liquid. The ejection waveform includes voltage changes in stages and the cancellation waveform also includes voltage changes in stages for suppressing residual oscillations and higher harmonic acoustic resonance frequencies.

The application discloses a kind of electric feedback compensation adjustable high Q acoustic resonator control method and system, belong to acoustic resonance control technical field, especially applicable to acoustic, electromechanical and other can be equivalent as resonance model oscillation system.The system includes resonance unit, excitation unit, response detection unit and feedback control unit;Among them, feedback control unit is injected to resonance unit after gain and phase adjustment to detected resonance response signal, to compensate system inherent loss and improve effective quality factor Q.By adjusting feedback gain and feedback phase, continuous control to system equivalent damping can be realized, to establish high Q working state.The method can realize loss compensation and quality factor promotion under the premise of maintaining system stability, with the advantages of strong controllability, good repeatability, wide application range, can be used for high sensitivity sensing, narrowband filtering, reconfigurable acoustic devices and related resonance control system.

This invention provides an ultrasonic sensor with Helmholtz resonance enhancement integrated at the fiber end face, belonging to the field of fiber optic ultrasonic sensing technology. The ultrasonic sensor includes an optical fiber and a sensing structure integrated at the fiber end face. The sensing structure includes a hollow spherical cavity and a pipe communicating with the cavity. The outer wall of the hollow spherical cavity constitutes an optical whispering-gallery mode resonant cavity, and the hollow spherical cavity and the pipe together constitute an acoustic Helmholtz resonant cavity. The ultrasonic sensor achieves dual enhancement detection of ultrasonic signals through the synergistic effect of optical and acoustic resonance. This invention, employing the aforementioned ultrasonic sensor with Helmholtz resonance enhancement integrated at the fiber end face, solves the problems of existing ultrasonic sensors being susceptible to electromagnetic interference, having insufficient sensitivity, being difficult to manufacture, having low miniaturization, and being unable to simultaneously meet the requirements of anti-interference, miniaturization, and high-sensitivity weak ultrasonic detection.

The application discloses a thermal power plant SCR denitration system ammonia injection grid self-adaptive control method and system, including ammonia injection grid module, thermal impedance monitoring module, sound wave tomography module, differential pressure monitoring module, sound wave cleaning module and central control module, the central control module identifies the ash branch according to the temperature response curve collected by the thermal impedance monitoring module, according to the sound wave signal collected by the sound wave tomography module, the ammonia concentration distribution field and the temperature distribution field are reconstructed, the differential pressure signal collected by the differential pressure monitoring module is extracted spectrum characteristics, the influence of the ash branch on the injection uniformity or the catalyst layer stability is verified comprehensively, and the cleaning target branch is determined. The application realizes the on-line perception of the ammonia injection branch state, the visual monitoring of the injection uniformity, the early diagnosis of the catalyst layer flow instability, the thermal-acoustic resonance self-cleaning and the closed-loop intelligent control of the predictive maintenance, effectively improves the denitration efficiency, reduces the ammonia escape and prolongs the equipment life.