112 results about "Acoustic streaming" patented technology

The invention relates to the technical field of wind turbine generator maintenance, and discloses a wind turbine generator blade unmanned aerial vehicle deicing assembly and method.The wind turbine generator blade unmanned aerial vehicle deicing assembly comprises an unmanned aerial vehicle, and a laser radar and an installation shell integrating an ultrasonic transducer, a pulse nozzle and a hydraulic pump are installed at the bottom of the unmanned aerial vehicle. The deicing control system obtains focus space coordinates and interface resonance frequency of the blade surface by using a space state sensing module; the stress field focusing module calculates the phase delay amount of the ultrasonic transducer, compensates the pose deviation of the unmanned aerial vehicle by adjusting the emission time sequence, and drives the ultrasonic transducer to generate resonance stress on an ice layer-skin interface; and the sound stream synchronous control module determines a jet flow triggering moment according to synchronous phase locking solution, drives a pulse nozzle at an instantaneous negative pressure phase point of a sound wave period to inject a small amount of deicing fluid into an interface crack, and generates shear stress to induce the interface crack to expand and peel off an ice layer. Accurate throwing of deicing energy is achieved, and the icebreaking efficiency is improved on the premise that the safety of the blade structure is guaranteed.

The invention discloses a method and application for ultrasonic-assisted laser additive manufacturing of a multi-scale structure coupling high-toughness aluminum alloy, and the method comprises the steps that high-Ni-content alloy steel powder is refined through high-energy ball milling, and then the refined alloy steel powder is dispersed and distributed in Al-Mg-Sc-Er-Zr alloy powder; an ultrasonic energy field is introduced to assist selective laser melting to form mixed powder, the ultrasonic energy field assists in generating nonlinear effects such as cavitation, acoustic streaming and heat effect, defects such as air holes and cracks are overcome to eliminate residual stress, and the Marlangoni effect is accelerated to increase the solidification speed; and finally, the high-strength and high-toughness aluminum alloy which has high density and is composed of micron-scale, submicron-scale and nano-scale multi-scale phase structures is prepared. The production cost is low, and the room-temperature tensile properties of the prepared high-strength and high-toughness aluminum alloy are as follows: the strength is greater than 850 MPa, and the fracture strain is greater than 6%.

The invention relates to the technical field of fault recognition, and provides a fault recognition method and system based on resonance mode recognition. The method comprises the following steps: carrying out acoustic streaming coupling resonance excavation on a target detection object, executing acoustic mode coupling simulation of a shear layer and a pipeline cavity, and establishing an acoustic streaming coupling resonance mode and a fluid resonance interval; monitoring vibration of a key position through a three-way vibration acceleration sensor, and collecting data; judging whether the vibration intensity exceeds a safety threshold value or not, if so, performing time-frequency feature analysis, and generating periodic steady-state, frequency spectrum and frequency doubling features; the vibration parameters are compared with the acoustic streaming coupling resonance mode, if resonance exists, fluid parameters are collected and compared with the fluid resonance interval, resonance verification is completed, fault judgment information is generated, and the technical problems that due to the fact that hidden faults caused by acoustic streaming coupling resonance cannot be effectively detected, the fault diagnosis accuracy is low, and the missed judgment rate is high are solved. The technical effect of improving the reliability, timeliness and pertinence of steam pipeline fault diagnosis is achieved.

The invention discloses a digital acoustic fluidic chip, a preparation method and a multi-dimensional sample processing method, the digital acoustic fluidic chip comprises an upper polar plate and a lower polar plate, and the upper polar plate comprises a glass layer, a coating layer and an upper hydrophobic layer which are arranged in sequence; the lower polar plate comprises a lower hydrophobic layer, a dielectric layer, an electrode layer and a substrate which are arranged in sequence; the electrode layer comprises an EWOD pin electrode, a driving electrode, a sound wave pin electrode and an interdigital transducer; the interdigital transducer comprises a sound field and electric field multiplexing module, a sound standing wave field and thermal field module, a focusing sound field and thermal field module and a sound vortex enrichment module; each driving electrode is connected with one EWOD pin electrode, the two sides of the sound field and electric field multiplexing module, the two sides of the sound standing wave field and thermal field module, the two sides of the focusing sound field and thermal field module and the two sides of the sound vortex enrichment module are all connected with the two sound wave pin electrodes, and one side of the sound field and electric field multiplexing module is further connected with one EWOD pin electrode. The method has the advantages of multi-dimensional sample treatment and high-flexibility treatment.

The invention belongs to the technical field of metal-based composite material additive manufacturing, and particularly relates to ultrasonic-assisted green laser equipment for copper-based diamond cooling fin machining, which comprises a rack, a printing cabin, a green laser machining system, an ultrasonic-assisted system, a powder spreading system, a gas control system, an intelligent control system and an online monitoring system. By integrating a green laser processing system and an ultrasonic auxiliary system, an ultrasonic-green laser-powder multi-energy field coupling processing system is constructed, the wavelength of green laser is 532 nm, the absorption rate of copper is increased, and compared with traditional infrared laser, low-power and high-efficiency melting of copper can be achieved, the diamond graphitization risk is reduced from the angle of a heat source, and the production cost is reduced. Ultrasonic vibration is transmitted to a molten pool through a substrate coupling type structure, by means of the cavitation effect and the acoustic streaming effect, the interface wettability of copper and diamond is effectively improved, the interface bonding force is enhanced, the interface thermal resistance is reduced, meanwhile, grains are refined, pores are eliminated, residual stress is reduced, and the comprehensive performance of the cooling fin is remarkably improved.

The invention relates to the technical field of rare earth permanent magnet material preparation, in particular to a method for preparing a neodymium-iron-boron magnet through ultrasonic-assisted screen printing and gradient temperature control. According to the preparation method, the nano aluminum oxide coating is prepared by adopting an ultrasonic-assisted screen printing technology, and the grain orientation degree and the microstructure uniformity are improved through the synergistic effect of an acoustic streaming effect, a heat effect and mechanical vibration energy generated by ultrasonic waves with the frequency of 20-30 kHz and the power density of 30-60 W / cm < 2 >; according to the invention, an Al-O-Si three-network structure is formed at a pre-sintering stage of 800 DEG C through nano aluminum oxide, so that the heat-resistant shrinkage stress is improved by 3 times; according to the temperature zone gradient temperature control diffusion process, the grain boundary structure is optimized, and the treatment time is shortened by more than 50%. The motor can be widely applied to new energy automobile driving motors and wind driven generators.

The utility model discloses ultrasonic shot peening composite MIG welding equipment, which relates to the technical field of welding and comprises a protective gas cylinder, a wire feeder, an MIG welding power supply, an integrated equipment upper computer, an ultrasonic power supply, an ultrasonic power supply integrated cabinet and a main body frame, a working table surface horizontal movement module, a three-dimensional movement module for driving the bearing overhanging arm to move, a movement module controller and an ultrasonic shot blasting component are arranged on the main body frame, and a welding gun clamp and a structured light sensor are fixedly arranged on the bearing overhanging arm. A molten pool is regulated and controlled through synchronous ultrasonic shot peening in the welding process, ultrasonic vibration in a molten pool area remarkably refines a solidification structure through the cavitation effect and the acoustic streaming effect, dendritic segregation is restrained, residual welding tensile stress can be effectively released through ultrasonic shot peening treatment loaded instantly after welding, and pressure stress is introduced; the effects of surface strengthening treatment and welding deformation improvement are achieved, and integrated regulation and control of the welding process and post-welding joint strengthening treatment are achieved.

The present application relates to the technical field of nanomanipulation, and more particularly to a method and device for manipulating nanoparticles based on the principle of acoustic streaming suppression, the method comprising the following steps: S1. setting a microfluidic chip with a cavity; S2. establishing a target standing wave acoustic field in the cross section of the cavity, wherein the sound pressure node plane of the target standing wave acoustic field is parallel to the adjacent side wall of the cavity; S3. introducing a fluid containing nanoparticles into the cavity, and the nanoparticles can be driven to the sound pressure node region under the action of acoustic radiation force and form a stable aggregation cluster; the device comprises a microfluidic chip, the microfluidic chip is provided with a cavity, and the surface of the microfluidic chip is provided with an acoustic wave driving structure, and the sound pressure node plane of the standing wave acoustic field generated by the acoustic wave driving structure is parallel to the adjacent side wall of the cavity. The present application can realize the directional or point manipulation of nanoparticles under the action of actively suppressing acoustic streaming interference.

The invention relates to the technical field of biology, and particularly discloses an acoustic fluid device and a method for controlling fusion of lipid vesicles through the acoustic fluid device, the device comprises a glass chamber and piezoelectric ceramics attached to the bottom face of the glass chamber, the piezoelectric ceramics are used for generating ultrasonic waves, and the glass chamber serves as a reaction chamber for fusing the lipid vesicles. The method comprises the following steps: determining a lipid vesicle fusion type, and determining vibration frequency and vibration intensity of required ultrasonic waves according to the type; and the piezoelectric ceramics generate ultrasonic waves with required vibration frequency and vibration intensity to act on the glass chamber. According to the invention, the intensity of the sound stream can be randomly and dynamically adjusted, so that the ultrasonic pulse is utilized to induce the sound stream to control the fusion of the lipid vesicles in a non-invasive manner. The method has the advantages of no toxicity, no chemical reagent residue, simple device, no special requirements on the physical properties of the fluid medium and the lipid membrane, non-contact control, good universality, no requirements on the bioprotein receptor on the surface of the lipid membrane and the components of the lipid membrane, and good biocompatibility.

This invention relates to the field of ultra-precision polishing technology, specifically to an ultrasonic cavitation microjet polishing module for polishing microstructures. The module includes an acoustic focusing nozzle, a center-penetrating piezoelectric transducer, an adaptive acoustic impedance frequency tracking system, and a liquid supply and bubble nucleation system. The acoustic focusing nozzle employs a variable cross-section acoustic amplitude rod structure, ensuring that the standing wave antinodes and nozzle outlet are confocal, thus increasing energy density. The piezoelectric transducer has a ring structure with fluid flowing through its center, achieving efficient energy conversion. The frequency tracking system adjusts the excitation frequency in real time to maintain resonance. The liquid supply system introduces cavitation nuclei through a venturi tube, reducing the cavitation threshold. This invention, through an acoustic-fluid coupling mechanism, utilizes the dual effects of macroscopic kinetic energy removal and microscopic cavitation removal to solve the problems of traditional polishing techniques, such as difficulty in processing high aspect ratio microstructures, incomplete bottom polishing, and low efficiency. It achieves high-precision polishing of microstructure surfaces, and is particularly suitable for ultra-precision machining of deep and narrow grooves.

A nano composite polymer brush production device relates to the technical field of nano material manufacturing equipment, and is formed by connecting a plurality of groups of production units through a transportation mechanism, and each production unit comprises a coaxial magnetic control plasma reactor, a honeycomb microchannel reactor, an acoustic streaming resonance separation tower and a spray drying former, wherein a separation cavity is vertically arranged on a base of the acoustic streaming resonance separation tower, a reducing part at the bottom of the separation cavity is connected to an external container through a heavy phase outlet, the top of the separation cavity is provided with a light phase outlet of a hollow cone of which the top is reduced, and the outer surface of the separation cavity is provided with an Archimedes spiral flow channel which extends from bottom to top and is provided with a plurality of groups of ultrasonic transducers; the bottommost end of the flow channel is connected with the inlet of the separation tower, and the outlet at the topmost end extends into the separation cavity and points to the light phase outlet; through the synergistic effect of the sound field and the Dean vortex, additional fluidization equipment is not needed, directional migration and enrichment of the brush layer nanoparticles can be effectively achieved, and the purity of the produced final product can reach 99% or above.

A method for spatializing a sound stream including a sound object in a motor vehicle comprises the steps of: extracting (203) the voice using an artificial intelligence model to separate the sound stream into two tracks, a first track including the sound object and a second track including the other sound elements of the sound stream; spatializing (205) the first track so that the sound object is perceived by a user of the motor vehicle as originating from a predefined location in the vehicle; and simultaneously broadcasting (209) the first and second tracks in the vehicle. A spatialization device and a motor vehicle including the device are also described. Figure to be published with the abbreviation: Fig 2

The invention relates to the technical field of micropore machining, in particular to an ultrasonic micropore machining method and device, and the ultrasonic micropore machining method comprises the steps that a first ultrasonic vibration table is arranged between a workbench and a workpiece; the ultrasonic cutter punches the workpiece; the ultrasonic vibration table generates vibration and transmits the vibration to the grinding material flowing above the workpiece; determining the sound stream drag force Fdrag of the first ultrasonic vibration table on the abrasive particles in the abrasive material; determining the acoustic radiation force Frad of the first ultrasonic vibration table on the abrasive particles in the abrasive material; and the impulse I of the abrasive particles in the horizontal direction is determined based on the acoustic streaming drag force Fdrag and the acoustic radiation force Frad, and the impulse I is made to be larger than 0. And abrasive particles are driven to move through ultrasonic waves, so that the technical effect of improving the machining quality is achieved.

The invention relates to a heating device and cooking equipment, and the heating device comprises a heating assembly which comprises a heat transfer part and a first heating part, the heat transfer part is provided with a cavity, the cavity is filled with heat conduction liquid, and the first heating part is arranged in the cavity; the ultrasonic assembly is arranged on the outer wall of the heat transfer piece and comprises an ultrasonic generator and a piezoelectric transducer. The first heating piece is immersed in the heat conduction liquid filled in the cavity, heat generated by the first heating piece is firstly transferred to the heat conduction liquid, and the temperature of the outer surface of the whole heat transfer piece is uniform by utilizing the heat conductivity and the fluidity of the liquid; the ultrasonic assembly generates high-frequency vibration, the vibration can generate an acoustic streaming effect, micro fluid movement is triggered, heat diffusion of the heating assembly is promoted, and temperature distribution in the inner container is more uniform. The ultrasonic waves can also generate a cavitation effect, microbubbles are generated in liquid or grease of the food to explode, a static thermal boundary layer is destroyed, heat is more uniformly transmitted to each part of the surface of the food, and the cooking effect is improved.

The embodiment of the invention provides a preparation method of graphene composite powder. The preparation method comprises the following steps: adding a mixed material of powder and a solid carbon source into a reaction cavity; vacuumizing the interior of the reaction cavity, and then filling inert gas to normal pressure; treating the mixed material in the reaction cavity by adopting an acoustic resonance process, and setting sound wave frequency, acceleration, treatment time and material temperature; and collecting products, and cleaning and separating powder. A mixed material in a reaction cavity is treated by adopting an acoustic resonance process, direct contact friction between a grinding material and powder is avoided through acoustic resonance mixing, the risk that impurities are introduced due to mechanical abrasion is reduced, and the problems that the cost is high and the compounding efficiency is low when graphene powder is prepared through a conventional vapor deposition method are solved; the acoustic streaming effect generated by resonance can permeate into the powder aggregate, the aggregate structure is effectively disassembled and is not influenced by different material densities, powder particles with different particle sizes and different components are promoted to be uniformly dispersed and interacted, and the shape of the original powder is not changed.

The invention relates to a colorimetric method-based rapid detection device and method for organic matters in industrial byproduct gypsum. The colorimetric method-based rapid detection device comprises a sample introduction and pre-dispersion module, an extraction reaction module, a pneumatic cyclone separation and refined filtration module, a color development mixing module and a colorimetric detection module, the sample injection and pre-dispersion module realizes continuous quantitative conveying and mixing of samples, the extraction reaction module performs micro-cutting type enhanced extraction on particles by utilizing an acoustic streaming effect generated by high-frequency standing waves, and the pneumatic cyclone separation and fine filtration module realizes rapid and efficient solid-liquid separation through tangential gas injection enhanced cyclone and in cooperation with an air flotation effect. The developing and mixing module is used for automatically and quantitatively mixing reagents. According to the invention, automation and continuity of the whole process from coarse particle sample feeding to organic matter content result output are realized, the detection time is greatly reduced, and the method is especially suitable for rapid quality monitoring of production and application sites of industrial by-product gypsum such as ardealite and the like.

Provided is a decontamination device capable of confirming whether a mist circulation dispersion unit is working properly before and after decontamination operation or during decontamination and capable of ensuring the operation of the decontamination device. The decontamination device is provided with a mist supply unit, a mist circulation dispersion unit, and an ultrasonic wave detection unit. The mist supply unit changes a decontamination liquid used for decontaminating the inside of a work chamber into a decontamination mist and supplies the decontamination mist to the inside of the work chamber. The mist circulation dispersion unit makes a vibration plate provided with a plurality of ultrasonic wave transmitters vibrate ultrasonically to generate an ultrasonic wave-based acoustic flow from the surface of the plate to the vertical direction, and makes a pressing action based on acoustic radiation pressure of the acoustic flow act on the decontamination mist to make the decontamination mist circulate and disperse in the work chamber. The ultrasonic wave detection unit is provided with an ultrasonic wave receiver for detecting the operation of the ultrasonic wave transmitters, and detects the operation of the plurality of ultrasonic wave transmitters as a whole and / or each ultrasonic wave transmitter provided in the vibration plate.

The invention discloses an automobile auxiliary frame welding method for reducing welding spatter through ultrasonic assistance. The automobile auxiliary frame welding method aims at solving the problems that spatter is serious and quality is not stable in a traditional welding process. The method comprises the steps that in the process of welding the automobile auxiliary frame, ultrasonic vibration is synchronously applied to a welding area; the core is that the ultrasonic vibration is started at the same time as or before the start of the welding current and is stopped after the stop of the welding current, and the generation of spatter is physically suppressed by the acoustic streaming effect and / or cavitation effect generated in the welding pool. Compared with the prior art, through real-time synchronous coupling of the ultrasonic and welding processes, welding spatter can be reduced by 70% or above, meanwhile, welding seam forming is improved, the grain structure is refined, an online monitoring and feedback control system can be integrated, and the welding quality, the production efficiency and the automation level are remarkably improved.

The utility model relates to the technical field of welding systems, in particular to a synchronous plug-in type ultrasonic-assisted laser welding system which is arranged on a guide rail group and comprises a laser welding part and a welding head connecting part, the laser welding part is connected with the guide rail group through the welding head connecting part, and the welding head connecting part is connected with the laser welding part. The laser welding part is used for emitting laser and welding a welding part; through the acoustic streaming effect and the cavitation effect of ultrasonic waves generated by the ultrasonic generation part, the fluidity of a molten pool is improved, the grain structure is refined, the quality and stability of a welding joint are improved, the joint strength and the welding seam quality of metal material laser welding are improved, and a laser welding head and an ultrasonic variable-amplitude needle head are rotated to proper angles to adapt to welding seams of different shapes; ultrasonic welding and laser welding are effectively combined, a welding part is welded, the quality and stability of a welding joint are guaranteed, and the adaptability of the welding system is improved.

This invention discloses a method and system for detecting the strongest Rayleigh acoustic current in immobilized microdroplets. Specifically, it involves: calculating the acoustic current suppression coefficient through experimental quantitative testing to establish a quantitative mapping relationship between acoustic current intensity and droplet contact angle; utilizing an electrowetting structure composed of interdigitated electrodes, a dielectric layer, and a hydrophobic layer to actively regulate the droplet contact angle through an applied voltage; and dynamically adjusting the applied voltage in real time by monitoring the droplet vibration amplitude, particle velocity, and contact angle through a collaborative control program to maintain the acoustic current intensity at its strongest. This invention also provides a detection system for implementing the above method, including an indium tin oxide transparent interdigitated electrode substrate, a lead zirconate titanate piezoelectric transducer, a laser Doppler vibrometer, a microscope, and a collaborative control module. This invention can maximize and dynamically maintain the Rayleigh acoustic current intensity in immobilized microdroplets, significantly accelerating the solid-liquid interface mass transfer process, and is applicable to biochemical analysis fields such as rapid immunoassay and biological particle mixing.

The invention discloses a 7075Al structure and method based on ultrasonic energy field assisted laser direct energy deposition, and belongs to the technical field of metal additive manufacturing. The method disclosed by the invention comprises the following steps: respectively pretreating 7075Al spherical powder and a substrate for later use; an ultrasonic energy controller is connected with the bottom face of the base plate through an ultrasonic amplitude-change pole, then the ultrasonic energy controller is started, and the base plate is made to vibrate through emitted ultrasound; then, it is ensured that laser and ultrasound are focused on the same focus on the surface of the substrate, powder conveying is started, laser energy deposition is started for deposition according to specific forming requirements, and after deposition is finished, a 7075Al structure is obtained; and during deposition, stopping light for 10s every time when a layer is printed, and stopping light for 3min every time when a layer is printed. According to the method, the metallurgical behavior of the molten pool is regulated and controlled through the cavitation effect and the acoustic streaming effect generated by ultrasound in the molten pool, and the 7075Al part with the fine equiaxed crystal structure can be prepared.

A piezoelectric ultrasonic self-cleaning microfluidic chip belongs to the field of microfluidic technology. The present invention includes a piezoelectric ultrasonic generator, a microfluidic chip and a cleaning liquid. The microfluidic chip is fixedly mounted on the piezoelectric ultrasonic generator. A microchannel is provided inside the microfluidic chip, or a microstructure provided at the bottom of the microfluidic chip and the piezoelectric ultrasonic generator are irreversibly sealed to form a microchannel. The upper surface of the microfluidic chip is provided with at least one liquid inlet and liquid outlet connected to the microchannel. The cleaning liquid enters the microchannel through the liquid inlet, flows along the microchannel, and is discharged through the liquid outlet. The present invention generates high-frequency ultrasonic surface waves through a piezoelectric ultrasonic generator, couples them into the microchannel of the microfluidic chip, and forms an acoustic flow effect inside the cleaning liquid. This can effectively remove residues inside the microfluidic chip, especially in the corner area, thereby improving the cleaning efficiency and controllability of the microfluidic chip.

The application discloses a kind of silicon carbide fiber bundle liquid phase suspension impregnation device and its interface layer preparation method, belong to ceramic matrix composite interface engineering field.Device includes unwinding mechanism, mechanical pre-twist mechanism, liquid phase impregnation tank, ultrasonic suspension dispersion system, guide assembly, drying unit and winding mechanism.Method by mechanical pre-twist will fiber bundle preliminary flatten into flat strip, again introduced liquid phase impregnation tank, under the action of ultrasonic field make fiber monofilament in liquid contactless suspension state, realize the uniform adsorption and deposition of interface layer precursor.The application utilizes the acoustic streaming field generated by ultrasonic wave in liquid to make fiber monofilament "suspended" in liquid, completely avoid the hard contact damage of fiber and mechanical parts, and solve the problem of uneven impregnation of each monofilament in fiber bundle.The thickness variation coefficient of interface layer obtained by the application is ≤5%, and the fiber strength retention rate is ≥95%, which is suitable for continuous and high-quality preparation of various interface layers such as carbon, BN, SiC and oxide on the surface of silicon carbide fiber.

A decontamination device capable of confirming accurate operations of a mist circulation dispersion means before and after or during a decontamination operation and guaranteeing the overall operation as a decontamination device.The device includes a mist supply means, a mist circulation dispersion means, and an ultrasonic detection means. The mist supply means converts a chemical for decontamination of the inside of a working chamber of the device into a mist for decontamination and supplies such mist to the inside of the working chamber. The mist circulation dispersion means subjects a vibrating board (which includes a plurality of ultrasonic transmitters) to ultrasonic vibration to generate sound flows with ultrasound from board surfaces in the vertical direction and presses the mist with acoustic radiation pressure of the sound flows in order to circulate and disperse the mist for decontamination in the working chamber. The ultrasonic detection means includes an ultrasonic receiver configured to detect the operation of the plurality of ultrasonic transmitters included in the vibrating board in as a whole and / or the operation of each of the constituent ultrasonic transmitters.

The application discloses a composite digital acoustic flow control chip, a preparation method and a multi-dimensional processing method. The chip comprises detachably connected upper and lower plates and a gap support assembly arranged between the upper and lower plates. The upper plate comprises a piezoelectric substrate, an acoustic surface wave interdigital electrode array arranged on the piezoelectric substrate, a first dielectric layer covering the interdigital electrode array, a conductive layer arranged on the first dielectric layer, and a first hydrophobic layer arranged on the conductive layer. By constructing the multi-dimensional acoustic wave control unit of the upper plate and the electrode array of the lower plate based on the dielectric wetting effect, the programmable and controllable movement of the droplet sample and the action of the acoustic surface wave in the droplet are realized, the digital control of the acoustic flow control technology is realized, and the capacity of the chip for sample enrichment, control, mixing and fixed-point heating is greatly improved through the design of multiple IDTs.

The invention relates to the technical field of automatic packaging of medical instruments, in particular to a packaging device for medical textiles. The acoustic streaming composite pressing plate comprises a compression driver, an integrated piezoelectric array and a porous bottom plate; the system generates a strong sound pressure field through high-frequency vibration of piezoelectric ceramics, and composite exhaust is conducted in cooperation with pulsation negative pressure. The core of the method is that an acoustic streaming effect and acoustic radiation pressure are utilized to destroy an air boundary layer on the fiber surface and induce microscopic turbulence, the high-pressure air bag effect under high-speed compression is effectively overcome, the exhaust resistance is reduced, meanwhile, fiber tearing caused by mechanical compaction is avoided, and the structural integrity of textiles is ensured.

This invention relates to a microfluidic chip driven by acoustically excited droplet-shaped microbubbles and its fabrication process. A droplet-shaped microbubble array is obtained through microfluidic chip structure design. Under acoustic excitation, the microbubbles oscillate, generating asymmetric acoustic-flow vortices, which in turn directionally drive the microfluidic fluid within the microchannels. The flow rate can be linearly controlled by adjusting the driving voltage, offering advantages such as non-contact, pollution-free, and highly efficient directional driving. The fabrication process is based on MEMS technology, employing nitrogen plasma bonding and soft lithography, resulting in low cost and suitability for mass production. This invention solves the problem of the lack of directionality in traditional symmetrical acoustic-flow vortices and can be widely applied in fields such as biomedicine, drug delivery, and chemical analysis.

The application discloses a method and device for growing silicon carbide crystal by ultrasonic-assisted liquid phase method. The method comprises the following steps: forming a melt containing silicon and a complexing agent, contacting a silicon carbide seed crystal with the melt to grow a crystal, applying ultrasonic waves to the growth interface and / or the interior of the melt by an ultrasonic wave generating device during the growth process, and separating the crystal after the growth is completed to obtain a silicon carbide crystal. The device comprises a furnace body, a seed crystal rod for fixing the seed crystal, an ultrasonic wave generating device and a control system. The cavitation effect generated by the ultrasonic waves in the melt is used to break carbon atom clusters to reduce defects, and the acoustic streaming effect is used to strengthen carbon solute transport to improve the growth rate and homogenize the melt temperature and the doping distribution, so that the growth rate and the crystallization quality of the silicon carbide crystal are significantly improved, the doping uniformity is improved, and a new technical approach is provided for the preparation of high-quality silicon carbide single crystal.

The invention discloses a nanopore transistor biomolecular sensor based on surface acoustic wave constraint and a preparation method thereof. The sensor comprises a substrate, a silicon nitride thin film layer, a detection layer, a first passivation layer covering the detection layer, a surface acoustic wave excitation structure arranged on the first passivation layer, a second passivation layer covering the surface acoustic wave excitation structure, a nanopore penetrating through the sensor, and a hydrophilic gate dielectric oxide layer covering the inner circumferential surface of the nanopore, which are stacked in sequence. The surface wave excitation structure is used for exciting a surface acoustic wave which is focused in a nanopore and generates a blocking effect on biomolecules, and comprises a piezoelectric film and an interdigital electrode layer arranged on the piezoelectric film. According to the invention, through the acoustic streaming effect of the acoustic surface wave, the charge induction of the transistor and the confinement effect of the nanopore, the broad-spectrum detection of various biomolecules can be realized without modifying a specific biological capture layer.

The invention discloses an ocean micro-plastic particle sorting and enriching integrated device and method based on bidirectional acoustic surface waves, and belongs to the crossing field of an acoustic micro-fluidic technology and ocean environment monitoring. According to the device, an inclined micro-channel design and a standing wave sound field coupling mechanism are adopted, flexible interdigital transducers which are symmetrically arranged in a sorting module are used for exciting surface acoustic waves with specific frequencies, and a high-strength sound pressure standing wave field is formed in a micro-channel. According to the particle size distribution characteristics of micro-plastic particles in the marine environment, efficient sorting of micro-plastic is achieved by accurately regulating and controlling acoustic radiation force parameters. And the sorted micro-plastics are directly introduced into the annular enrichment module, and the sound streaming effect generated by a traveling wave sound field is utilized to realize rapid enrichment of particles. According to the device, the technical bottleneck of sample transfer loss in the traditional method is overcome through the integrated design of the sorting and enriching process, and a high-sensitivity and low-cost pretreatment solution is provided for marine micro-plastic pollution monitoring.