184 results about "Broadband noise" patented technology

The invention discloses an unmanned aerial vehicle soft landing control method based on track prediction and multi-source cooperative decoy, and the method comprises the steps: introducing a communication protocol recognition mechanism in a blocking process of an instruction link of an unmanned aerial vehicle, and achieving the conversion from extensive broadband suppression to protocol precise interference; the problems that in the prior art, power consumption is high, interference on legal communication is large, and the frequency hopping unmanned aerial vehicle resisting effect is insufficient can be effectively solved. In the scheme, signal integrity is guaranteed through monitoring and preprocessing, an unmanned aerial vehicle link protocol is identified through feature extraction and protocol library matching, and then a targeted interference template is generated, so that the interference effect can accurately fall on key positions such as a leader sequence, a CRC field, a subcarrier or a control frame and the like; therefore, synchronization, verification or data transmission can be destroyed under the condition of low power, and accidental damage of broadband noise to services such as co-frequency Wi-Fi and Bluetooth is avoided.

The invention provides a self-adaptive collaborative acoustic environment active treatment system and method. The system comprises a multi-dimensional environment sensing network module, an intelligent voiceprint recognition and sound field prediction module, an active noise control module, a central intelligent collaborative regulation, diagnosis and self-learning module and a passive acoustic intervention module. The multi-dimensional environment sensing network module collects multi-dimensional sensing data in real time; the intelligent voiceprint recognition and sound field prediction module outputs a voiceprint recognition result and a noise source space coordinate and predicts a sound field evolution trend; the active noise control module outputs a residual noise signal; the central intelligent cooperative regulation, diagnosis and self-learning module outputs an active and passive cooperative control instruction set; the passive acoustic intervention module controls broadband noise to block or change its propagation path. According to the invention, through a dual-channel self-learning mechanism of the deviation diagnosis capability, continuous evolution of system performance can be realized according to a deviation autonomous optimization acoustic model and a control strategy, and accurate, efficient and prospective active treatment is carried out on a complex noise environment.

The invention discloses a broadband noise generation method based on predistortion calibration, and relates to the technical field of communication, and the method comprises the steps: S1, setting a flatness threshold value, and screening out an original noise signal needing to be calibrated; s2, generating an inverse filter coefficient and a filter suppression coefficient for the original noise signal; s3, performing frequency response compensation by using an inverse filter coefficient, performing band-pass filtering by using a filter suppression coefficient, performing down-conversion to a baseband, and reducing a sampling rate; and S4, comparing the processed signal with a flatness threshold value, and if the processed signal does not exceed the flatness threshold value, indicating that signal calibration is completed, otherwise, entering calibration again. By introducing a pre-distortion calibration mechanism, the inverse filter coefficient is calculated in real time to compensate the system frequency response, the spectrum distortion caused by a fixed filter is effectively eliminated, and the method has the advantages of realizing dynamic and adaptive filter adjustment, effectively reducing the manual participation frequency and improving the continuous operation capability and the test efficiency of the system.

The invention relates to the field of aviation noise control, and provides an aircraft landing gear noise reduction device and method based on micro metal wire spiral winding. The device part comprises a metal wire and a metal wire fixing buckle, the metal wire is fixed through the metal wire fixing buckle, and meanwhile the size and material parameters of the metal wire are designed in a targeted mode. In the method part, the designed metal wire is wound on a cylindrical bluff body part, possibly generating vortex shedding and vortex-fixing interference, on the nose gear in a spiral winding manner, and the two ends and the axial interval position of the metal wire are fixed through the metal wire fixing buckles, so that the metal wire is ensured to be fastened. Therefore, through the wound metal wires, single-frequency noise in the over-top direction caused by falling of a towing rod vortex can be effectively eliminated, broadband noise is reduced, and the noise control capability of an airplane is improved. The method is suitable for various civil aircraft types, and has the advantages of being simple in structure, remarkable in noise reduction effect, high in practicability, high in adaptability and the like.

The invention relates to the technical field of submarine cable fault detection, in particular to a submarine cable fault detection system. The method comprises the steps that an adjustable low-frequency pulse injection unit injects a low-frequency pulse excitation signal and collects a response signal generated by a submarine cable fault; the multi-source signal fusion acquisition unit acquires a reflected voltage signal, an acoustic signal and a leakage magnetic field signal, and constructs a multi-modal fusion response characteristic matrix; the intelligent broadband noise suppression unit is used for performing noise suppression processing on each modal sub-matrix to obtain a de-noised multi-modal fusion response characteristic matrix; and the intelligent fault positioning interpretation unit is used for constructing a three-dimensional signal fingerprint spectrogram, performing classification analysis on fault events based on a fuzzy clustering algorithm and a depth feature matching model to obtain a fault type, and performing calculation through a path residual fitting method to obtain a fault position. The invention realizes a detection system which does not depend on a special cable structure, can actively excite and fuse multi-source signals, and can position submarine cable faults at high precision.

The invention discloses a design method of a noise reduction fairing, which comprises the following steps: determining a performance demand parameter of the noise reduction fairing, and constructing an initial noise reduction model based on a noise spectrum of a target application scene and an air duct structure defect; structural parameters are designed according to the performance requirement parameters; establishing a fluid-solid-sound coupled parameterized model of the layered composite structure and the flow guide assembly, and performing iterative optimization to generate an optimized configuration of the noise reduction fairing; a fairing prototype is manufactured based on the optimized configuration, actual measurement data are collected, simulation errors are corrected through an empirical regression model, and boundary conditions of a parameterized model are updated; the corrected noise reduction fairing is disassembled into modular assemblies, and an assembly process based on modularization is designed; in the assembling process of the modular assembly, a digital positioning system is adopted to be matched with an assembly interface; through the collaborative design of the layered composite structure and the diversion assembly and the module assembly design of the manufacturing link, the balance of broadband noise suppression and heat dissipation efficiency is realized, and the overall performance is improved.

The invention discloses an unmanned aerial vehicle instruction link blocking interference method and device based on communication protocol identification, which can effectively solve the problems of high power consumption, large interference on legal communication and insufficient anti-frequency hopping unmanned aerial vehicle effect in the prior art by introducing a communication protocol identification mechanism in the unmanned aerial vehicle instruction link blocking process. Firstly, signal integrity is guaranteed through monitoring and preprocessing, then an unmanned aerial vehicle link protocol is identified through feature extraction and protocol library matching, and then a targeted interference template is generated, so that the interference effect can accurately fall on key positions such as a leader sequence, a CRC field, a subcarrier or a control frame and the like; and synchronization, verification or data transmission can be destroyed under a low-power condition, so that accidental damage of broadband noise to same-frequency Wi-Fi and Bluetooth services is avoided. Meanwhile, through a frequency hopping prediction model and a scheduling mechanism, the interference signal can follow the frequency hopping switching of the unmanned aerial vehicle in real time.

A method includes defining a design domain for a meta-element configured to be attached to an edge of thin wall structure with an arbitrary boundary condition, and executing a topological optimization process on the design domain and providing a topology optimized shape for the meta-element. The topological optimization process includes an objective function that minimizes a reflection coefficient of flexural waves in the audible frequency range propagating towards and impinging the meta-element.

The embodiment of the invention provides a compressor sound insulation structure and a control method thereof. The compressor sound insulation structure comprises a sound insulation cover and a deformation device. The compressor is covered with the sound insulation cover. The sound insulation cover comprises an inner sound insulation layer and an outer sound insulation layer which are sequentially arranged from inside to outside, and a resonant cavity is formed between the inner sound insulation layer and the outer sound insulation layer; the inner sound insulation layer is provided with a plurality of through holes and is made of a shape memory material; the deformation device is arranged in the soundproof cover and used for receiving the operation frequency of the compressor and driving the inner soundproof layer to deform according to the operation frequency so that the hole diameter of the through hole can be changed. Through the arrangement of the resonant cavity, the intensity of low-frequency noise is gradually weakened under the resonance effect, and therefore effective absorption of the low-frequency noise is achieved; by arranging the deformation device and the inner sound insulation layer made of the shape memory material, intelligent adjustment of the hole diameter of the through hole is achieved, so that the sound absorption frequency of the inner sound insulation layer and the resonant cavity is dynamically adjusted, the noise reduction requirement for broadband noise is met, and the operation noise of the outdoor unit is reduced.

This invention discloses a broadband composite sound insulation structure, including a first sound insulation mechanism and a second sound insulation mechanism. The first and second sound insulation mechanisms are disposed opposite to each other, with a closed air layer formed between them. Through the arrangement of the first, second, and air layers, the broadband composite sound insulation structure of this invention can effectively reduce and suppress broadband noise, including high-frequency, mid-frequency, and low-frequency noise. By incorporating the first and second sound insulation panels, noise reduction can be achieved while minimizing external environmental pollution to both the first and second sound insulation layers.

The invention provides an interval adaptive signal detection method and system based on a digital channelized receiver, and belongs to the field of signal detection in passive radars. The problems that in the passive radar signal receiving process of an existing digital channelized receiver, aliasing of signals and broadband noise exists, and power gains of different frequency bands are unequal, so that channelized signals cannot be normally detected are solved. The amplitude and phase information of M paths of signals are obtained by designing a filter bank, performing multiple serial-parallel conversion processing on input data and performing IFFT operation and CORDIC operation on data output by filtering K paths, then m-point self-correlation accumulation is performed on the amplitude of the M paths of signals, and the amplitude and phase information of the M paths of signals is obtained. Meanwhile, a more flexible threshold calculation method is provided, the working and signal detection bandwidth of the channelized receiver is refined, and a new scheme is provided for improving the signal detection adaptivity of the digital channelized receiver. The method is suitable for signal detection in a scene with non-uniform interference and gain distribution in the working bandwidth of the receiver.

The invention discloses a low-frequency broadband sound absorption metamaterial adaptive wing and a design method thereof, and belongs to the technical field of aircraft design. The problem that in the prior art, a traditional aircraft wing and a design method thereof are difficult to achieve the low-frequency and broadband noise reduction effect is solved. The wing comprises a leading edge inner side slat, a leading edge outer side slat, a main wing, a trailing edge inner side flap and a trailing edge outer side flap, the leading edge inner side slat and the leading edge outer side slat are connected with the front side of the main wing, and the trailing edge inner side flap and the trailing edge outer side flap are connected with the rear side of the main wing; the metamaterial sound absorption strips are embedded into concave cavities of the leading edge inner side slat and the leading edge outer side slat respectively, the metamaterial sound absorption strips are embedded into the leading edge of the main wing, each metamaterial sound absorption strip is composed of a Helmholtz resonator array composed of single-layer Helmholtz resonator units, and each metamaterial sound absorption strip is provided with a micro-perforated surface with continuous curvature. The noise reduction level of the wing is effectively improved, the sound absorption frequency band is wider, and the method can be applied to sound absorption wing design.

The invention provides a broadband noise adaptive active noise reduction control method, which belongs to the technical field of noise reduction control, and comprises the following steps of: 1, acquiring and enhancing an original reference signal for target broadband noise; step 2, multi-channel coherence calibration is carried out based on the enhanced reference signal; step 3, generating a control signal based on the calibrated reference signal; 4, collecting an error signal based on an error microphone arranged in a vehicle compartment; and step 5, performing adaptive parameter updating based on the calibrated reference signal and error signal. The problems of slow algorithm convergence and poor noise reduction performance caused by inaccurate reference signal spectrum capture, easy pollution and poor multi-channel coherence in the existing method are solved, and efficient and stable control of broadband noise is realized.

The invention provides an alternating-current weak current high-precision detection system and method, and the system comprises a copper-nickel alloy shielding cover which is used for inhibiting space power frequency radiation interference and power system broadband noise, and a magnetic sensitive element which is used for converting the detected magnetic field change into a corresponding initial current signal, the trans-impedance amplifier is used for converting the initial current signal into a voltage signal; the adaptive noise suppression module collects a power frequency fundamental wave reference signal and a harmonic wave reference signal, generates a harmonic wave anti-phase counteracting signal, and performs anti-phase counteracting on real noise of the initial current signal; the analog-to-digital converter is used for converting the voltage signal into a discretized digital signal, and the discretized digital signal comprises a target signal and a random noise signal; and the FPGA coherent demodulation module is used for carrying out cross-correlation operation and narrow-band filtering on the target signal and the random noise signal to separate out a micro-current signal. The technical problems that in the prior art, composite noise covering is limited, the frequency fluctuation adaptability is poor, and microvolt-level signals are difficult to capture are solved.

The present disclosure provides a method for optimizing a broadband noise of an inductive magnetic field sensor as well as a magnetic field sensor, including: determining a functional relationship between an induced voltage of a coil and an effective permeability of a magnetic core of the inductive magnetic field sensor; determining an equivalent voltage noise expression of a temperature variation-induced permeability noise of the magnetic core according to the functional relationship; determining a key influencing factor of the magnetic core according to the equivalent voltage noise expression of the temperature variation-induced permeability noise of the magnetic core; modifying the magnetic core according to the key influencing factor of the magnetic core to optimize the temperature variation-induced permeability noise of the magnetic core; and constructing a dual-channel composite multi-stage modulation signal-noise separation circuit to optimize a low-frequency band noise and a high-frequency band noise of the inductive magnetic field sensor.

The invention discloses an aircraft low-noise bionic flap based on side edge local turbulent flow and a design method, and belongs to the field of aircraft design. The high lift device is composed of a slat and a main wing, the high lift device comprises an inner flap, an outer flap, a noise reduction system and a driving system, the inner flap and the outer flap are installed on the high lift device, the noise reduction system is arranged at the end, close to the outer flap, of the inner flap, and the noise reduction system is driven by the driving system located in the inner flap; the noise reduction system comprises bionic nodules and asymmetric wingtip end plates, the bionic nodules are arranged on the end face of the inner flap, and the asymmetric wingtip end plates are arranged on the two sides of the inner flap. Aiming at the problems of influence on aerodynamic performance, generation of extra noise and complex structure in a flap side edge noise reduction method, the invention provides an aircraft low-noise bionic flap based on side edge local turbulent flow, and the effect of reducing intermediate-frequency broadband noise of the flap is achieved while the aerodynamic performance of a high lift device is ensured.

The disclosure relates to systems and methods for enhancing active noise cancellation (ANC) in a vehicle, particularly for addressing challenges associated with broadband noise control. The present disclosure introduces a novel approach of subband adaptive filtering (SAF) that significantly reduces computational load and improves noise cancellation within a wide spectrum. The noise elimination system comprises a reference sensor, an adaptive weight filter, a loudspeaker, an error microphone, a signal processing unit, a sub-band processing module, a gradient determination module, an adaptive step size determination module, a sub-band adaptive weight updating module and a weight transformation module. By reducing complexity and improving convergence rate and stability of adaptive filter weights, the disclosed methods enable ANC to be implemented in environments with limited processing capabilities without sacrificing performance.

The invention discloses an aero-generator fan blade synchronous vibration acoustic identification method and system, a medium and equipment, and the method comprises the steps: determining a microphone array layout through parameters of a fan model; sound pressure time domain signals of multiple channels of the fan are synchronously collected through a microphone array; arranging the multi-channel sound pressure time-domain signals in sequence to construct a time-domain signal matrix; performing spectral analysis on the sound pressure time-domain signal by adopting a fast Fourier transform algorithm to obtain a spectrogram of the sound pressure time-domain signal of each channel, and monitoring whether a broadband noise component of which the blade passing frequency amplitude of the fan exceeds a first preset value and the frequency band distribution is greater than a preset range appears by monitoring the spectrogram; if not, it is indicated that the fan is in a normal working state, when the fan blades vibrate synchronously, the vibration of the blades is reflected through the frequency and the frequency doubling acoustic mode of the frequency, and the vibration pitch diameter and the frequency of the fan blade disc are output through the frequency passing acoustic mode of the blades on the basis of the frequency coupling relation.

The invention relates to the technical field of biomedical signal processing and medical electronics, in particular to a blood pressure measuring method for non-invasive exercise blood pressure monitoring. The method aims to solve the technical problem of low blood pressure measurement accuracy caused by broadband noise interference and failure of a fixed parameter model in a motion state in the prior art. According to the technical scheme, the method comprises the steps that a cardiac cycle reference signal and a Korotkoff sound signal are synchronously collected, a sampling window is calculated in a self-adaptive mode by utilizing a cycle triggering feature point gating mechanism and combining a heart rate, and time domain precise interception of the signals is achieved; carrying out root mean square calculation and Savitzky-Golay filtering on the intercepted signal, and keeping waveform characteristics while denoising; constructing a multi-dimensional feature regression model containing a peak value, skewness, kurtosis and dynamic template similarity so as to accurately judge systolic pressure and diastolic pressure; an automatic recharging mechanism is triggered by monitoring signal quality, and strong interference is physically avoided. The method has the advantages of being high in anti-noise capacity, high in feature extraction robustness and accurate and reliable in measurement result.

This invention discloses a frequency conversion circuit, a wireless communication circuit, an apparatus, a system, and a method. The technical solution of this invention, through optimization and improvement of existing passive frequency conversion circuits, can further reduce costs. Furthermore, by directly feeding the broadband noise signal into the resonant unit from the second modulation port without other loss circuits, the path loss of the broadband noise signal can be reduced, thereby obtaining more oscillation signals. This allows more oscillation signals to be fed into the modulation element for mixing, ultimately resulting in more frequency conversion signals. In other words, with the same initial radio frequency signal power, the frequency conversion circuit can produce more frequency conversion signal power, correspondingly reducing the power consumption of the frequency conversion circuit and achieving a longer wireless operating distance.

The invention discloses a shielded cable electricity testing method based on ground loop impedance potential lifting, and relates to the technical field of measurement. The electroscope comprises an electricity testing step, an induction electrode on the cambered surface of the electroscope is used for obtaining induced electricity, a broadband direct sampling framework is formed on the physical level, and broadband direct sampling of millivolt-level power frequency displacement current characteristics is achieved. Based on a variational mode decomposition-Duffing oscillator fusion weak signal extraction algorithm, a variational mode decomposition algorithm is utilized to adaptively strip broadband noise and higher harmonics, a reconstructed signal is subjected to scale normalization and then introduced into a critical chaotic state Duffing oscillator algorithm, phase transition of a phase track from a chaotic attractor to a large-scale limit cycle is monitored, and a weak signal is extracted. A non-linear dynamic weak signal extraction algorithm is formed on the algorithm level, and weak power frequency features masked by strong noise are accurately recognized; a broadband direct acquisition framework and a weak signal extraction algorithm form a dual detection framework, and a quasi-induction electric signal is detected and judged in the live part verification process of the shielded cable.

This utility model discloses a negative pressure compressor silencer made of composite sound-absorbing material, including a negative pressure fan body and a silencer pipe fixedly installed on the air inlet end of the negative pressure fan body. An air inlet channel is fixedly installed on the inner wall of the silencer pipe, and a primary noise reduction mechanism is provided on the inner wall of the air inlet channel near the pipe opening. The primary noise reduction mechanism includes an air inlet cylinder fixedly installed on the inner wall of the air inlet channel, and multiple air inlets are opened on the outer wall of the air inlet cylinder. This utility model, through the inner ring silencer cylinder, outer ring silencer cylinder, and silencer ring cylinder of the primary noise reduction mechanism forming a multi-stage sound absorption structure, utilizes the cooperation between the silencer holes and the annular cavity to allow sound waves to reflect and diffract between different cavities, effectively absorbing mid-to-high frequency noise. The coaxial and annular array distribution design of the air inlets guides the airflow to enter evenly, reducing the generation of eddy noise. The composite structure of the perforated metal cylinder and the sound insulation felt further blocks the transmission of noise, improving the broadband noise reduction effect.

The utility model provides a centrifugal fan, including volute still include: impeller, the impeller is provided with at least two groups, and at least two groups impeller follow the axial direction of volute, the middle disc is arranged between two groups of adjacent impeller, two groups of adjacent impeller are separated through the middle disc, and the import of middle disc is linked together with the import of volute, each group impeller is provided with several blades, and several blades are arrayed around the axial direction of volute, and the blade of two groups of adjacent impeller is staggered along the projection direction of blade. Through the mode for increasing the number of blade, increase the times of cutting the airflow that enters the volute, thereby improved the frequency of rotation noise, namely BPF noise, make BPF noise frequency far away from the hearing range of human ear, and then reduce the situation that the user hears the rotation noise. In addition, the blade that interlaces can break the shedding vortex that the blade tail edge produces, reduces the broadband noise of fan.

The invention belongs to the technical field of noise reduction, and particularly relates to an impedance composite type low-frequency broadband superstructure sound absorber and an impedance transfer matching composite design method thereof.The impedance composite type low-frequency broadband superstructure sound absorber comprises a mounting side plate, an end face perforated plate, a metal wire mesh, a perforated material domain and a bottom plate; the end face perforated plate and the bottom plate are arranged at the axial end part of the mounting side plate to form a cavity with a hole in one end; the metal wire mesh is arranged in the cavity, and a surface cavity is formed between the end face perforated plate and the metal wire mesh; the perforated material area is arranged between the metal wire mesh and the bottom plate, and a back cavity is formed between the bottom and the bottom plate; the perforated material domain comprises at least one perforated material layer; the perforated material layer is of an acoustic impedance matching structure. Compared with the prior art, the problem that the cost is increased due to the complex structure of the acoustic superstructure in the prior art is solved. According to the impedance composite type low-frequency broadband superstructure sound absorber, low-frequency and broadband noise control is achieved, meanwhile, the structure is simple, and the design and production efficiency is high.

The present invention discloses a subwavelength ventilated asymmetric sound absorber, which is composed of one or more absorption cells. The absorption cell includes a metamaterial resonator and a backing impedance boundary. The backing impedance boundary includes a rear panel, a top panel, a bottom panel, a long plate and a short plate, which together form an L-shaped structure; a flow port is provided on the upper portion of the rear panel to facilitate airflow; the bottom of the metamaterial resonator is placed on the short plate of the backing impedance boundary, and a channel is left between it and the bottom plate of the backing impedance boundary; the back of the metamaterial resonator is fixedly connected to the side of the long plate of the backing impedance boundary, and a channel is left between it and the rear panel of the backing impedance boundary. The deep subwavelength absorber of the present invention can almost perfectly absorb the sound energy incident from the loss end and almost perfectly reflect the sound energy incident from the opposite end, has a good suppressive effect on broadband noise, and can achieve ventilation and heat dissipation functions while controlling noise.

The utility model discloses a silencing device for a ventilation system of a heating ventilation air conditioner, and relates to the technical field of heating ventilation air conditioner equipment, the silencing device comprises a ventilation pipeline and a silencing assembly, the silencing assembly is used for eliminating noise generated in the ventilation process of the interior of the ventilation pipeline, and the silencing assembly comprises a silencing laminated plate and a side position closing plate; the side closing plate is fixedly connected to the side face of the silencing laminated plate, and a first high-frequency absorption layer, a low-frequency absorption layer and a second high-frequency absorption layer are arranged between the silencing laminated plate and the side closing plate. According to the utility model, the high-frequency absorption layer I, the low-frequency absorption layer and the high-frequency absorption layer II are arranged to form the structure shaped like the Chinese character'pin ', so that noise with different frequencies is subjected to targeted absorption treatment. The high-frequency absorption layer adopts melamine foam plastic to effectively capture high-frequency sound wave energy, and the low-frequency absorption layer and the sound absorption cotton layer have a synergistic effect to absorb low-and-medium-frequency noise, so that comprehensive treatment of broadband noise generated by the ventilation system is realized.

An electronic system with heat dissipation and feed-forward active noise control function includes a fan module, an embedded controller, a reference microphone, a multi-channel speaker module, a beamforming control module and an active noise reduction controller. The beamforming control module controls the orientation of the multi-channel speaker module. The multi-channel speaker module provides anti-phase noise signals to cancel noise according to a speaker control signal. The reference microphone detects broadband noise generated by the fan module in operation to provide a corresponding broadband noise signal. A virtual microphone module of the active noise reduction controller provides a virtual error signal according to a transfer function between the reference microphone and a physical error microphone, a transfer function between the multi-channel speaker module and the physical error microphone and the broadband noise signal, and generates the speaker control signal according to a synchronization signal, the broadband noise signal and the virtual error signal.

The invention relates to the technical field of short-wave communication, and discloses a short-wave broadband frequency selection method, which realizes precise frequency selection of 12kHz / 24kHz broadband communication under the condition that traditional narrow-band short-wave equipment does not upgrade hardware through a cooperation mechanism of narrow-band detection signals and broadband ground noise monitoring. The method combines narrowband signal-to-noise ratio evaluation and broadband spectrum analysis, ensures that the selected frequency has optimal communication quality in both narrowband and broadband ranges, effectively solves the problem that traditional narrowband frequency selection cannot adapt to broadband services, has the advantages of environmental adaptation, high calculation efficiency, strong compatibility and the like, and is suitable for popularization and application. And the reliability and the economical efficiency of short-wave broadband communication are remarkably improved.

The invention relates to the technical field of building external envelope structures and green building energy conservation, in particular to an acoustic super-structure composite unit and a glass curtain wall, the acoustic super-structure composite unit comprises a first substrate, a second substrate and a middle substrate arranged between the first substrate and the second substrate; a local resonance module is arranged on the middle-layer substrate; a through hole is formed in the middle-layer substrate; a frame structure is further included; a first convex edge and a second convex edge are arranged on the frame structure; by integrating the photovoltaic module, the local resonance module, the middle-layer substrate and the thermal insulation layer formed by aerogel, on the premise that the thickness and the weight are not remarkably increased, the problem of function mutual exclusion among broadband noise pollution, heat loss and energy self-sufficiency is solved, and the thermal insulation effect is improved. And collaborative improvement of multi-physical field performance is realized.

The noise reduction device provided by the embodiment of the invention comprises a first air inlet, an air duct and a first air outlet, wherein the air duct comprises an air duct interval and a plurality of sub air ducts; the air channel interval is made of at least two different materials, and air reaches the first air outlet from the first air inlet through the multiple sub air channels. According to the embodiment of the invention, the larger air duct is divided into the plurality of sub-air ducts through the air duct interval, the air duct interval is made of at least two different materials, gas reaches the first air outlet from the first air inlet through the plurality of sub-air ducts and is exhausted, and the plurality of materials are combined to form the plurality of slender sub-air ducts; broadband noise generated by various gas flow rates can be reduced, the noise generated by various gas flow rates can be controlled at an ideal level, the contact area between gas and the partition wall surface of the air duct is increased through the multiple slender sub-air ducts, the gas flow rate in each slender sub-air duct is reduced, the vortex size is reduced, and the vortex effect is improved. When gas enters the area where the plurality of slender sub-air ducts are located, the acoustic impedance changes, and the noise level is effectively reduced.