197 results about "Acoustic streaming" patented technology

The invention provides a calculation method for propagation of underwater explosion shock waves in a non-uniform acoustic flow field, and the method comprises the steps: simulating the propagation of the underwater explosion shock waves in a non-uniform fluid through an axial symmetry calculation model of an underwater explosion load in the non-uniform fluid based on a local discontinuous Galerkin method and a continuity condition; according to the method, a calculation model special for heterogeneous fluid is constructed, and continuous conditions are combined, so that the propagation process of underwater explosion shock waves in a heterogeneous flow field containing a sound velocity discontinuous interface and a sound velocity gradient is effectively simulated. According to the method, the influence of the sound velocity spring layer interface on the underwater explosion shock wave propagation path and the load peak value can be accurately analyzed, and more reliable underwater explosion load data are provided for the action of the submarine near the sound velocity spring layer. According to the invention, the influence of the flow field sound velocity gradient on the underwater explosion load and cavitation characteristics can be effectively studied, and the design and construction scheme of the protection ship and maritime work structure is optimized according to more accurate underwater explosion load input data.

The invention relates to the technical field of solid-state battery energy conversion, and discloses a high-safety sodium-ion battery energy conversion method based on a solid-state electrolyte, which comprises the following steps: identifying an interface dynamic mismatch risk time period in a charging and discharging process, and applying micro-amplitude high-frequency acoustic vibration disturbance to a solid-state electrolyte and a sodium negative electrode interface in the time period, sodium ion microscopic distribution is regulated and controlled through the acoustic streaming effect, contact stress is dredged, dendritic crystal early nucleation is inhibited, dynamic reconstruction and optimization of the interface state are achieved, the solid-state sodium-electricity interface is converted into dynamic self-adaption from static mismatch, the ion transmission uniformity is actively maintained through the acoustic streaming effect, and dynamic reconstruction and optimization of the interface state are achieved. And meanwhile, real-time sensing of an interface state and dynamic adjustment of acoustic vibration parameters are realized in combination with an acoustic probing mechanism, so that the interface stability and dendritic crystal inhibition capability are effectively improved, and the energy conversion efficiency and the safety performance of the battery are remarkably enhanced.

Disclosed are a standing wave acoustofluidic device for sorting exosomes in body fluids and a method for using same. The standing wave acoustofluidic device for sorting exosomes in body fluids comprises an upper microfluidic chip and a lower acoustic wave excitation apparatus. The microfluidic chip comprises a channel chip and a cover plate, and the acoustic wave excitation apparatus comprises a piezoelectric transducer and an acoustic wave coupling liquid layer. The piezoelectric transducer is reversibly connected to the cover plate by means of the acoustic wave coupling liquid layer. The piezoelectric transducer is a piezoelectric ceramic. The channel chip is provided with a body fluid sorting channel, and the cover plate is provided with a micro-channel groove array structure corresponding to the body fluid sorting channel. The micro-channel groove array structure adjusts acoustic waves excited by the piezoelectric transducer, such that the acoustic waves are modulated in a space composed of the channel chip and the cover plate to form a required standing wave acoustic field. The present invention has advantages such as not affecting cell activity, being unaffected by temperature and the like, offering a stable sorting process, a simple manufacturing process, and low regulation difficulty, and eliminating the need to match the width, depth, and the like of microfluidic channels with the half-wavelength of acoustic waves.

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%.

A thrust reverser includes a fixed structure and a movable structure defining an air stream, a flap including a single wall perforated on the surface thereof, and a structure strengthening the flap and having an acoustic function. The flap being articulated between the fixed structure and the movable structure to allow in a direct jet position, disposing the wall along an acoustic section of the movable structure and allowing the circulation of an air flow through the air stream, the acoustic section forming with the structure of the wall an acoustic resonator, and in a reverse jet position, disposing the wall to deflect an air flow passing through the air stream and allow the passage through the wall and through the air stream of a portion of the air flow deflected by the flap.

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

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 discloses a metal-air flow battery device based on an ultrasonic air focusing method. A metal-air flow battery belongs to the technical field of mutual crossing of ultrasound and electrochemistry and comprises a piezoelectric plate, a piezoelectric plate and acoustic lens fixing support, an acoustic lens, a metal-air flow battery fixing platform, a connecting platform of the whole device, a metal-air flow battery unit, an electrolyte inlet pipe and an electrolyte outlet pipe. According to the device, a sound field generated by ultrasound acts on the surface of the cathode electrode, so that sound pressure and sound stream jointly act on a three-phase reaction interface, and the oxidation-reduction reaction rate at the three-phase reaction interface is increased. The battery device comprises a piezoelectric plate, a piezoelectric plate driving power supply, an electrolytic bath, a metal anode, an air cathode, an acoustic lens and a peristaltic pump, the device can be combined with other traditional methods for improving the performance of the metal-air battery; the device for improving the performance of the battery can be used as an external component and does not influence the internal structure and the stability of the battery.

The invention discloses a cell drug screening device and method based on microstructure induced shear acoustic streaming. The micro-structure array processed and manufactured on the acoustic flow driving chip is utilized, so that the high-frequency acoustic surface wave and the micro-structure unit generate acoustic-solid coupling and oscillation, an acoustic streaming effect is generated through excitation in the micro-channel cavity, a stable acoustic flow field is formed, the acoustic flow field generates micro-acoustic streaming shearing, and the acoustic flow effect is improved. The biological cells in the acoustic flow field are subjected to controllable shearing force to change the permeability of cell membranes, so that the medicine is accelerated to enter the cells, and the medicine screening of the cells is promoted; the sizes, the shapes and the periods of the microstructure units are different, the microstructure units respectively and correspondingly excite micro-acoustic streams with different flow speeds, corresponding shearing forces are different, and then different stimulation effects are brought to cell membranes; screening the cell drugs to obtain the specific effect of the drugs on the cells.

The invention relates to the technical field of nano control, in particular to a nano particle control method and device based on an acoustic streaming suppression principle, and the method comprises the following steps: S1, arranging a micro-fluidic chip with a cavity; s2, a target standing wave sound field is established on the cross section of the cavity, and the sound pressure node plane of the target standing wave sound field is parallel to the adjacent side wall of the cavity; s3, fluid containing nano particles is introduced into the cavity channel, the nano particles can be migrated and driven to a sound pressure node area under the action of sound radiation force, and stable aggregation clusters are formed; the device comprises a micro-fluidic chip, the micro-fluidic chip is provided with a cavity channel, the surface of the micro-fluidic chip is provided with a sound wave driving structure, and a sound pressure node plane of a standing wave sound field generated by the sound wave driving structure is parallel to an adjacent side wall of the cavity channel. According to the method, the directional or fixed-point control of the nano particles can be realized under the action of actively inhibiting the sound stream interference.

According to the capacitive deionization seawater desalination device adopting the ultrasonic enhanced flowing electrode charging method, after a positive / negative flowing electrode is charged to adsorb ions, the potential difference of a system is improved by utilizing charges loaded on the surface of the positive / negative flowing electrode, so that the adsorption capacity on opposite-polarity charge ions is enhanced; meanwhile, an ultrasonic field is coupled to one side of a current collector of the flow electrode capacitive deionization device, and the collision contact frequency and the ion migration rate among active particles are improved by utilizing acoustic streaming and acoustic cavitation effects generated by ultrasound, so that the adsorption efficiency and the charge loading capacity of the flow electrode are improved. Compared with the prior art, the invention has the following beneficial effects: 1, the electric potential difference between the positive electrode and the negative electrode is increased by utilizing charges loaded on the surface of the flowing electrode, and the electric field driving force and the attraction force to anisotropic charge ions are enhanced, so that the ion adsorption efficiency is improved; and 2, the ultrasonic field is coupled with the flow electrode capacitive deionization device, so that the collision contact frequency and the ion migration rate among active particles in the flow electrode are improved, and the charge loading capacity of the flow electrode is further improved. And 3, compared with the traditional flow electrode capacitive deionization technology, the capacitive deionization seawater desalination device adopting the ultrasonic enhanced flow electrode charging method has the advantages that the average desalination rate is improved by 223.78% or above, and the charge efficiency is improved from 70% or below to 90% or above.

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.

Provided is an in vivo liquid flow promotion device capable of safely and effectively promoting a liquid flow in a desired direction.The in vivo liquid flow promotion device includes an ultrasonic oscillator that generates an ultrasonic wave, and an acoustic flow generator that adjusts the phase of an ultrasonic wave generated by an ultrasonic oscillator to focus the ultrasonic wave on a predetermined position, and that allows to generate an acoustic flow in in vivo fluid at a focused position by a pressure distribution generated in accordance with the phase.

To provide an in-vivo liquid flow promotion device capable of safely and effectively promoting a liquid flow in a desired direction.SOLUTION: The device comprises: an ultrasonic vibrator 2 which generates ultrasonic waves; and an acoustic stream generation part 3 which adjusts the phase of the ultrasonic waves generated by the ultrasonic vibrator to converge it at a predetermined position and causes an in-vivo liquid at a convergence position to generate an acoustic flow by a pressure distribution generated according to the phase.SELECTED DRAWING: Figure 2

The invention discloses a method for regulating and controlling an additive manufacturing submicron titanium-based composite material through an ultrasonic energy field, and belongs to the field of additive manufacturing of titanium-based composite materials. According to the method, superfine ceramic powder is adopted as a reinforcement material of the composite material, the superfine ceramic powder and titanium alloy matrix powder are mixed and dried, and the submicron titanium-based composite material is prepared through the laser melting deposition technology; in the preparation process, an ultrasonic tool head is placed on a deposition layer behind a molten pool, an ultrasonic energy field is synchronously applied to the surface of a sample, and composite material grain refinement is achieved through double influences of the ultrasonic energy field on the molten pool and the deposition layer. Ultrasonic waves are transmitted into a molten pool to generate acoustic streaming and cavitation effects, so that the molten pool is stirred, uniform distribution of C atoms is promoted, the temperature gradient of the molten pool is reduced, uniform nucleation of TiC and betaTi is promoted, and epitaxial growth of TiC and betaTi is delayed; ultrasonic waves act on a high-temperature deposition layer to generate plastic deformation, recrystallization is triggered, alpha Ti is refined, and refining of microstructures of a reinforcement body and a base body is promoted.

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.

Disclosed herein are a speaker module capable of providing left and right sound balance and a sound field enhancement effect, and a display device including the same. The speaker module comprises a support plate, a sound output unit fixed on an upper surface of the support plate, a guide plate disposed on an upper surface of the support plate and having formed therein a sound flow path for guiding an output direction of sound output from the sound output unit, and a cover plate covering the sound flow path. A plurality of sound flow paths is formed in an outward direction of the support plate centered on the sound output unit.

The present invention discloses an acoustofluidic polystyrene microsphere enrichment chip and its use method and application, and relates to the technical field of acoustofluidic enrichment chips. It includes: a piezoelectric transducer, which is connected to a signal generator and used to convert the electrical energy generated by the signal generator into acoustic mechanical energy; a microfluidic channel, which is connected to a piezoelectric transducer and used to receive the acoustic mechanical energy generated by the piezoelectric transducer, and an acoustic node is generated in the center of the microfluidic channel under the action of acoustic waves; the microfluidic channel is provided with a microfluidic channel inlet and a microfluidic channel outlet, and a solution containing modified polystyrene microspheres is injected through the microfluidic channel inlet, and the modified polystyrene microspheres are effectively enriched in the center of the microfluidic channel under the action of acoustic waves. The polystyrene microsphere enrichment chip provided by the present invention has the advantages of small device size and low cost, and the use method is simple, and can be used for the separation and detection of food or drug components, with good repeatability and high separation and detection efficiency.

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 discloses a preparation method of monatomic platinum based on acoustic suspension, and relates to the technical field of monatomic preparation. The method comprises the following steps: dispersing MoS2 powder in a platinum source solution, adding a stabilizer, and uniformly mixing to obtain a precursor solution; suspending the precursor solution by adopting an acoustic suspension method, and modulating sound field parameters to obtain suspension droplets with oscillating motion; and adding a reducing agent into the suspension drops, and carrying out a reduction reaction to obtain monatomic platinum loaded on the MoS2 substrate. According to the invention, an acoustic suspension technology is adopted, the stable loading of monatomic Pt is realized through ultrasonic effects such as fan harmonic oscillation enhanced acoustic streaming excited by an ultrasonic field, and the preparation method has the advantages of high efficiency, stability and uniform loading.

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.