169 results about "Viscous flow" patented technology

The invention discloses a modularized replaceable self-resetting energy consumption type bridge pier anti-collision system, and belongs to the technical field of bridge engineering structure safety. The system includes an annular rubber pad, an annularly disposed damper module, and a shape memory alloy (SMA) tow. The damper module comprises a cylinder body, high-viscosity fluid, a reset spring, a piston and a force transmission plate. The cylinder body is fixed to the pier in a surrounding mode through bolts and rubber pads, the inner wall of the cylinder body is connected with the piston through a reset spring, the piston rod end is hinged to the force transmission plates, and the SMA wire bundles are connected with the force transmission plates. When an external impact load acts on the force transmission plate, the fluid damper provides viscous energy consumption, and the SMA wire bundle, the spring and the rubber pad provide deformation energy consumption; after the collision is finished, the system can be reset to the initial position under the synergistic effect of the SMA wire bundle, the spring and the rubber pad. By means of the modular design, efficient energy consumption and self-resetting can be achieved; and meanwhile, a single damper can be quickly replaced after being damaged, so that the maintenance efficiency and the system recoverability are greatly improved.

The invention discloses an asphalt self-healing performance evaluation method based on an equal modulus process, and belongs to the technical field of asphalt material performance detection and evaluation.The asphalt self-healing performance evaluation method comprises the steps that the linear viscoelastic stress threshold value tau L of asphalt is determined through a linear amplitude scanning test, and control stress tau T is selected for a fatigue test; sequentially implementing a fatigue test I, an intermittent healing period and a fatigue test II, determining a modulus initial value delta0 and a modulus termination value deltaL in an equal modulus process through dynamic shear modulus change data, and calculating a loading frequency difference deltaN corresponding to the equal modulus process; and establishing a self-healing degree index HI in combination with the normalization processing and the intermittent time, and quantifying the recovery of the fatigue resistance of the asphalt. According to the method, the influence of viscous flow is effectively separated through the equal modulus process, fatigue performance recovery related to molecular diffusion is accurately represented, index reliability is verified through the molecular diffusion model, the problem that in the prior art, asphalt anti-fatigue performance recovery cannot be accurately represented is solved, and a scientific basis is provided for research and development of high-performance asphalt materials.

The invention discloses a ship viscous flow numerical simulation method based on a hybrid Cartesian grid, and relates to the technical field of ship CFD. The method comprises the steps that after a computational domain is constructed, a body-fitted grid is generated at the object plane boundary of a ship model; then, on the basis of the outermost-layer body-fitted grid, a full-thread tree is used for carrying out space division on a computational domain to generate a Cartesian grid, and the full-thread tree is output as Cartesian grid topological information matched with the data structure of the target viscous flow solver; and finally, assembling and coupling the body-fitted grid and the Cartesian grid by using an overlapping grid technology to obtain a mixed partition grid unit, and applying the mixed partition grid unit to a solving process of a target viscous flow solver. Therefore, the accuracy and robustness of viscous flow numerical simulation of the ship with the complex geometry are improved, and the method can be well applied to resistance and flow field numerical simulation scenes in underwater and water surface ship body motion states.

The invention discloses continuous nitration reaction equipment, and relates to the technical field of high efficiency and energy conservation, in particular to continuous nitration reaction equipment, which comprises a reaction tank body and a driving motor arranged at the top end of the reaction tank body, a plurality of reaction cabins capable of being filled with materials are arranged in the reaction tank body, and the plurality of reaction cabins are communicated in sequence; according to the continuous nitration reaction equipment, through the arrangement of the multiple reaction cabins, the stirring rods, the driving blades and the stirring rods, the effects of efficiently mixing materials and improving the heat exchange efficiency can be achieved. A plurality of reaction cabins which are communicated in sequence are arranged in the reaction tank body, and materials can flow through the cabins in sequence to complete multi-stage reaction. The driving motor drives the driving rod, so that the stirring rod rotates at a high speed, strong mechanical acting force is applied to a reaction solution, the solution is promoted to generate complex and strong convection, shearing and diffusion movement, the viscous flow state of an axis area is broken, and efficient mixing is achieved.

The invention belongs to the technical field of ocean engineering, and particularly relates to a potential flow-viscous flow real-time coupling hydrodynamic analysis method and system for a floating body with a heaving plate. The method comprises the following steps of: 1, establishing a free surface potential flow model based on a three-dimensional potential flow theory, simulating wave-structure interaction, ignoring a viscous effect, converting a frequency domain result of a hydrodynamic load into a time domain load through a frequency-to-hour method, and taking the time domain load as an input for solving a motion state; 2, establishing an unbounded viscous flow CFD model, viscous force not covered by a potential flow model and an updated unbounded turbulent flow field around the heaving plate, and calculating the viscous force of the heaving plate; 3, establishing an unbounded potential flow model, and separating a force component repeated with the potential flow from a viscous flow result; 4, integrating the potential flow force and the viscous force to solve a floating body motion equation, iteratively updating the motion state and feeding back the motion state to the two solvers. The method is used for solving the problems that the efficiency is correspondingly reduced if the precision is improved and the precision cannot meet the requirement if the efficiency is improved in the prior art.

An electric submersible pump stage optimized for viscous fluid is provided. The stage can include a diffuser having a curved break water area. The stage can include an impeller having a cut back shroud and / or hub.

The invention relates to the technical field of material science and engineering, in particular to an amorphous alloy high-temperature rheological behavior prediction method, which comprises the following steps: acquiring multi-scale characteristic parameters of an amorphous alloy under a high-temperature condition, and constructing a viscoelastic constitutive model coupled with beta relaxation intensity and free volume evolution based on the multi-scale characteristic parameters; obtaining structure evolution data under different energy states, and correcting the viscoelastic constitutive model based on the structure evolution data; combining the corrected viscoelastic constitutive model with a machine learning algorithm, and generating a high-temperature rheological behavior prediction model through training; and based on the high-temperature rheological behavior prediction model, outputting a rheological stress value of the amorphous alloy under target temperature and stress conditions, and when the target temperature is higher than the glass transition temperature, introducing a viscous flow correction term into the viscoelastic constitutive model. According to the method, accurate and widely-applicable amorphous alloy high-temperature rheology prediction is realized by obtaining multi-scale parameters, constructing a coupling model, combining experimental correction and a neural network and verifying covered double-temperature zones.

The invention provides a rocket aircraft flow field correction method based on multi-fidelity data fusion, and the method comprises the following steps: 1, collecting low-fidelity data, and carrying out the construction of a low-fidelity data set: simulating the change process of an unsteady flow field around an object in a finite time step through a Reynolds time-average simulation method or a large vortex simulation method; 2, data correlation analysis is carried out, wherein a linear relation model yH = rho (x) yL + delta (x) of a non-viscous flow field yL and a viscous flow field yH of the rocket aircraft is established; step 3, neural network architecture design: constructing a low-fidelity data approximation network NNL; 4, performing hyper-parameter learning and optimization; defining a loss function; 5, performing data acquisition and preprocessing: performing high-fidelity viscous flow field data acquisition, and preprocessing the acquired high-fidelity and low-fidelity flow field data; and step 6, model training and verification.

The invention relates to a method for forming an annular micro-channel in a conductive polymer PMMA / CB material based on a thermal-electric coupling effect, which comprises the following processing steps of: 1, performing annular array hole processing on the conductive polymer PMMA / CB, and processing micropores in an annular array on the surface of the conductive polymer PMMA / CB; 2, performing thermal field processing on the conductive polymer PMMA / CB treated in the step 1, and heating the conductive polymer PMMA / CB to a viscous flow state so as to form an internal micro-channel structure; and applying a rotating electric field to form the internal annular micro-channel. Based on a phase field model theory, the conductive polymer PMMA / CB is used for processing by using a thermal-electric coupling method, and a new scheme is provided for manufacturing the internal annular micro-channel.

The present disclosure generally relates to microfluidics, and to systems and methods for controlling the introduction of fluids. For example, certain aspects are generally directed to microfluidic devices having ports able to direct the end of a pipette tip into an end portion that is sized so as to allow fluid to flow from the pipette tip into an exit fluidly connected to a microfluidic channel. For example, the port may have a tapered portion that directs the pipette tip to the end portion. The end portion may be sized such that it is difficult for fluid to backflush around the pipette tip, and thus, the fluid is able to flow into microfluidic channels within the device, e.g., without resulting in excessive fluid remaining within the end portion. Other aspects are generally directed to methods of making or using such microfluidic devices, kits including such microfluidic devices, and the like.

This application relates to the field of sealing structure technology, specifically to a dynamic sealing structure for a servo motor system, a servo motor system, and an underwater vehicle. The dynamic sealing structure includes: a stern hull, a rudder shaft, a compensating plunger, a first sealing ring, and a viscous fluid medium. The stern hull has a mounting hole on its side wall for mounting the rudder shaft. The rudder shaft is disposed within the mounting hole, with its first end extending to the outside of the stern hull and its second end extending to the inside of the stern hull. The compensating plunger is slidably disposed between the mounting hole and the rudder shaft, and can slide along the axial direction of the rudder shaft, with one end of the compensating plunger contacting the outside of the stern hull. The first sealing ring is disposed between the outer periphery of the rudder shaft and the inner wall of the mounting hole, forming a sealing cavity with the stern hull, compensating plunger, rudder shaft, and first sealing ring. The viscous fluid medium fills the sealing cavity. Underwater vehicles incorporating this dynamic sealing structure have good sealing performance and can significantly reduce the risk of leakage.

The invention relates to the technical field of building pile foundations, and discloses an anti-seismic pile foundation structure for a green building, the anti-seismic pile foundation structure for the green building comprises an integral external mechanism, the integral external mechanism further comprises two precast piles, and the anti-seismic pile foundation structure for the green building aims to solve the problem that a certain position of a pile foundation is subjected to large impact instantly, so that a pile body is bent; through viscous flow friction loss, a part of vibration generated by seismic waves can be absorbed, vibration transmitted to an upper building is reduced, a first limiting block can also generate certain displacement, and during displacement, the first limiting block can extrude a first sliding block to slide in a first sliding groove to extrude gas in the first sliding groove, so that the gas in the first sliding groove is extruded; a part of kinetic energy generated by an earthquake is consumed and converted into friction heat energy through sliding, through energy conversion and shock absorption buffering, it is avoided that a certain position of a pile foundation is subjected to large impact instantly, and consequently a pile body is bent, and meanwhile the influence of earthquake waves on a building is reduced to a certain degree.

The invention relates to a filling method and a filling line wherein a plurality of filling units, each one being suitable to contain the volume of fluid necessary to fill a respective container C, are recirculated in the filling line along a closed path P2, along a portion of which they are temporarily integral with respective containers C and fill them autonomously at a buffer station, in a longer time than that necessary for filling the same volume of fluid into said filling units which, therefore, can be filled at the normal production speed of the line at a filling station separate from the buffer station. Downstream of the buffer station, the emptied filling units are separated from the respective filled container C and are filled with a new volume of fluid, in order to autonomously transfer it to another, respective container C at the buffer station.

Provided is a viscous fluid supply apparatus capable of simplifying apparatus configuration for confirming the type of viscous fluid and determining the remaining amount of the viscous fluid.　The viscous fluid supply apparatus executes a process of supplying viscous fluid to a supply target. The viscous fluid supply apparatus comprises: an attachment unit to which a storage container for storing the viscous fluid can be detachably attached; a recognition unit for recognizing an identification information section provided on the storage container; and a control unit for determining the type of the viscous fluid stored in the storage container on the basis of the identification information indicated by the identification information section recognized by the recognition unit, and determining the remaining amount of the viscous fluid in the storage container on the basis of the position of an identification section on the storage container recognized by the recognition unit.

The application belongs to the field of polymer composite materials, and particularly relates to a preparation method of an ultrahigh molecular weight polyethylene / continuous fiber composite plate. The method comprises the following steps: (1) mixing ultrahigh molecular weight polyethylene, high-carbon straight-chain hydrocarbon and an antioxidant, and then mixing and extruding to obtain a viscous flow extrudate; the high-carbon straight-chain hydrocarbon is a normal alkane with 10-16 carbon atoms; (2) compounding the viscous flow extrudate with a continuous fiber fabric, and then performing hot extrusion to obtain a hot extruded product; and (3) sequentially performing hot soaking, cooling, cold extrusion and extraction treatment on the hot extruded product to obtain a composite plate. In the application, the high-carbon straight-chain hydrocarbon is used to dissolve the ultrahigh molecular weight polyethylene at high temperature, and then the high-carbon straight-chain hydrocarbon is removed through cold extrusion and extraction, so that the ultrahigh molecular weight polyethylene is hot extrusion compounded with the continuous fiber fabric to realize molding. In the whole molding process, no special and complicated equipment is needed, and the method is suitable for industrialized continuous production. Moreover, the obtained composite plate exhibits excellent mechanical properties.

The inspection device disclosed herein is used for an installation system including an installation device for configuring components on a substrate. The inspection device includes a control unit that extracts an area included in a captured image obtained by capturing a processing object with a viscous fluid formed at a predetermined position, calculates the center of gravity of the extracted area, and determines whether the center of gravity is included in a standard range of the predetermined position serving as a reference for the captured image, thereby determining whether a bridge of viscous fluid is generated across adjacent predetermined positions.

A device to reduce turbulent flow skin friction uses carbon dioxide, riblets, and suction holes to reduce the overall drag of a body moving in a fluid. A deflector (2) pushes up the boundary layer of the incoming flow on a surface (1). Carbon dioxide is injected into a plenum (3) and ejected through an exhaust slot (4). Riblets of specific dimensions (5) are placed to interact with the carbon dioxide flow that is now the sublayer viscous flow. After passing the riblets, the flow is sucked partly through suction holes (6), preventing flow separation that could increase the form and wave drag.

An improved viscous flow non-reflection numerical value wave water tank relates to the technical field of computational fluid mechanics and comprises a computational domain, a flow field solving module, a liquid-liquid two-phase VOF module, a wave making module, a wave absorbing module, a solid-liquid boundary processing module and a data acquisition and analysis module, and the wave making module and the wave absorbing module are used for generating target waves to absorb emergent wave energy; the liquid-liquid two-phase VOF module realizes synchronous acquisition of an internal interface and a mixing ratio; the solid-liquid boundary processing module applies a complex / moving boundary condition on the fixed grid; the data acquisition and analysis module extracts information of a free surface and an internal interface, calculates characteristic quantities such as waves and mass transfer, feeds back indexes such as a reflection coefficient and a conservation error for damping and time step self-adaptive adjustment, realizes high-precision capturing of large deformation of the free surface, synchronously obtains mass transfer and flow information in liquid, and realizes high-precision capturing of large deformation of the free surface. And the influence of the reflected wave on the calculation precision is effectively suppressed.

The invention discloses a preparation method of high-temperature magnetic slurry for an inductor capable of being formed at low pressure, and relates to the technical field of electronic component materials. Magnetic powder is pretreated through a coupling agent, a uniform molecular layer can be formed on the surface of the magnetic powder, the acting force between the magnetic powder and organic molecules of a glue solution is improved, dispersity is enhanced, and eddy-current loss is reduced; the epoxy resin system with a specific ratio uniformly coats the magnetic powder by means of a high-speed rotation mode of a homogenizer, and can be converted into a viscous flow state after being heated, so that the magnetic powder has excellent warm-pressure fluidity, improves the magnetic density through pressing, can be matched with a curing agent to be rapidly cured, can be stably formed under the low pressure of 30-50 MPa, and avoids coil damage and magnetic core cracking; and the method is suitable for preparation of complex-structure composite inductors.

A fluid analysis system includes a fluid circuit and a foam generator positioned along the fluid circuit. The foam generator is configured to receive a gas and a viscous fluid to produce a fluid mixture. The fluid analysis system further includes a helical coil positioned along the fluid circuit downstream of the foam generator and configured to receive the fluid mixture. The fluid analysis system further includes one or more processors for determining a foam rheology of the fluid mixture after the fluid mixture flows through the helical coil.

In general, in one aspect, embodiments relate to a downhole tool assembly, that includes a rotary mechanism, a pulsing mechanism, that includes a rotary disc in mechanical communication with the rotary mechanism, where a window of the rotary disc periodically aligns with a corresponding window of the downhole tool assembly to generate a pressure pulse based on a periodicity of the rotary mechanism, and a discharge port configured to discharge fluid as the fluid is being pulsed by the pulsing mechanism.

The invention discloses a double-screw feeding and vacuum injection rubber hot-pressing forming machine which comprises a foot stool, a mold lifting unit is arranged on the foot stool and used for lifting a mold, a mold hoisting unit is arranged above the mold lifting unit and used for hoisting the mold, a double-screw feeding unit is arranged above the mold hoisting unit, and a vacuum injection unit is arranged above the double-screw feeding unit. When the double-screw feeding mechanism is used for producing, the main screw and the auxiliary screw of the double-screw feeding unit are meshed with each other to generate violent shearing, stretching and kneading effects, so that high-viscosity rubber compound is quickly homogenized and converted into a homogeneous viscous flow state, and the high-viscosity rubber compound is subjected to high-speed shearing, stretching and kneading. A self-cleaning effect is formed in a meshing area of the screw rods, and dead angles of accumulated materials are removed through dynamic mutual wiping between the screw rods; the self-adaptive gap design is formed through the sealing assembly between the upper mold hanging rod of the mold hanging unit and the vacuum cover, smooth sliding is achieved in the cold and hot temperature difference state, clamping is avoided, and the sealing performance of the vacuum cover in the vacuumizing process is not affected through the sealing effect of the sealing ring.

To automatically exchange an exchangeable member of a printer.SOLUTION: A printer for performing printing processing of viscous fluid on a printing object using a screen mask includes: a moving part for performing at least one of movement of exchangeable members to an exchange position and carry in / out of the exchangeable members, for each of the two or more exchangeable members including at least one of the cartridge, the squeegee and the cleaning member among a cartridge storing the viscous fluid, a squeegee, a cleaning member used to clean the screen mask, and a support member for fixing the screen mask and the printing object; and an exchange control part for controlling the moving part, and executing exchange processing to exchange the exchangeable member.SELECTED DRAWING: Figure 2

The utility model discloses a rotary filtering device for treating viscous fluid in a cross-flow manner, and relates to the technical field of filtering devices. The device comprises a main body structure which comprises a base and a supporting frame fixedly arranged at the upper end of the base; the filter structure comprises a filter box, a filter cartridge I positioned on the inner wall of the upper end of the filter box, a flow guide hopper II positioned at the lower end of the filter cartridge I, a filter cartridge II fixedly arranged at the lower end of the flow guide hopper II, and a conveying pipe communicated with the lower end of the filter box; and; the rotating structure comprises an annular cylinder fixedly arranged at the upper end of the base, a sealing sleeve embedded in the inner wall of the annular cylinder, a rotating ring connected to the outer wall of the conveying pipe in a sleeving manner, a supporting pipe penetrating through the upper end of the filter box, a gear ring connected to the outer wall of the supporting pipe in a sleeving manner, a motor fixedly arranged on the inner wall of the upper end of a supporting frame and a gear located at the output end of the motor. By arranging the rotating structure, the problems that when viscous fluid passes through a fixed filter, dead angles are possibly formed in some areas, solid substances are easily gathered, a filter screen is blocked, and the maintenance cost is increased are solved.

Provided is a rotary damper capable of appropriately removing bubbles generated during assembly.　The present invention provides a rotary damper that comprises a housing, a shaft, a cap, and a sealing member, wherein: the housing has a bottomed cylindrical shape having a filling space, and is configured such that the filling space is filled with viscous fluid; the shaft is configured to be fitted into the housing so as to be capable of rotating relative thereto; the cap has a cylindrical shape, has an insertion hole through which the shaft is inserted, and is configured such that an outer peripheral surface thereof comes into contact with an inner peripheral surface of the housing, and an inner peripheral surface thereof comes into contact with the sealing member; the sealing member has an annular shape, and is attached to the shaft such that the inner peripheral surface thereof comes into contact with the shaft; and the filling space is sealed by the cap coming into contact with the sealing member between the inner peripheral surface of the housing and the shaft.

The invention provides a semi-immersion type viscous fluid piezoelectric high and low frequency composite printing device, and relates to the field of piezoelectric on-demand jet printing. The piezoelectric high and low frequency composite printing device comprises an upper cover module, a cavity module, a plurality of piezoelectric driving modules, a screw, an annular soft pad, a bolt and a nut, the upper cover module comprises a top cover, a liquid inlet pipeline, a liquid outlet pipeline, a liquid inlet table and a liquid outlet table, the cavity module comprises a groove body, a pressing strip, a gasket, a bottom plate and a nozzle, and the piezoelectric driving module comprises a piezoelectric vibrator, a vibrator shell, a short pressing plate, a long pressing plate and a soft pad outside the groove. Modular design is adopted, parts are convenient to upgrade and maintain, the service life is long, stability is good, the manufacturing cost is low, and the problems that after an existing piezoelectric printing spray head and a printer are fixedly connected, maintenance is inconvenient, and a nozzle is blocked are solved.

A viscous fluid feeder supplies viscous fluid used for printing. The viscous fluid feeder comprises a holder with an opening through which a cartridge containing the viscous fluid can be inserted and removed, a mounting receptacle onto which the cartridge is secured by pressing the cartridge horizontally from the opening to the rear, and a first air supply area located on the mounting receptacle such that the first air supply area is connected to the cartridge in a state where the cartridge is attached to the mounting receptacle and is configured to supply initial air to the cartridge to discharge the viscous fluid from the cartridge.

The invention relates to the technical field of composite material forming, in particular to a polyimide fiber composite material forming method and a mold. The die is composed of a common upper die, a lower die and an outer frame. The innovation point of the invention is that physical exhaust is carried out by using a natural gap of a mold parting surface in a critical stage when resin enters a viscous flow state through a specific programmed step temperature control and dynamic exhaust process. According to the method, the pore defect caused by the fact that volatile components are difficult to discharge in the forming process of the high-performance thermosetting polyimide at the temperature higher than 400 DEG C is overcome. The device is simple in structure, low in cost and particularly suitable for large-scale production of the polyimide fiber composite material.

The invention relates to the technical field of knee joint exoskeleton devices, in particular to a viscous damping knee joint exoskeleton device. The knee joint assembly comprises a first rotating assembly and a second rotating assembly which are rotationally connected; the pair of leg connecting assemblies are connected with the first rotating assembly and the second rotating assembly correspondingly, and the pair of leg connecting assemblies are used for being connected with thighs and shanks on the same side of the user correspondingly; the viscous fluid damper comprises a first connecting piece and a second connecting piece which rotate relatively, and the first connecting piece is connected with the first rotating assembly; and the clutch device is arranged between the second connecting piece and the second rotating assembly, and the clutch device is used for switching the rotating coupling state of the second connecting piece and the second rotating assembly, so that the second connecting piece and the second rotating assembly are circumferentially coupled or decoupled. The buffering effect can be effectively improved, and joint impact is reduced.

The invention relates to a preparation method and a preparation device of a supercritical fluid (SCF) foamed fiber and the foamed fiber prepared by the SCF foamed fiber, and the preparation method comprises a fiber preparation step, an SCF infiltration step, a foaming point forming step and a viscous flow plastic deformation and foaming step. According to the invention, the fiber finished product and the fiber product are allowed to be directly subjected to SCF foaming processing, the cell density, the micro-nano scale and the closed state of the obtained foamed fiber are controllable, and the obtained foamed fiber has improved heat insulation effect, shielding effect, net buoyancy, flame retardant effect, deep dyeing effect and wearing comfort.