54 results about "Viscous effect" patented technology

The invention discloses an electromobile EMB system clamping force estimation method based on a non-pressure sensor, and relates to the technical field of distributed electric drive-by-wire automobiles, the viscous effect between a brake disc and a friction plate during actual braking is considered, and a clamping force dynamic stiffness model is established for predicting the clamping force; discretizing a description equation of the clamping force dynamic stiffness model, and establishing a discretized clamping force state space equation; according to the motor torque balance equation, designing a sliding-mode observer of the motor load torque for observing the load torque of the motor in real time in the braking process; according to a transmission model of the EMB system, a load torque observation value observed by the sliding mode observer in real time is converted into a clamping force observation value; and calculating an optimal clamping force estimated value at the current moment according to an optimal clamping force estimated value obtained at the previous moment by using a Kalman filtering algorithm in combination with the discretized clamping force state space equation and the clamping force observed value, so as to realize real-time optimal estimation of the clamping force. The problems that under the control of the pressure sensor, due to high temperature and high pressure during braking, the measuring precision of the pressure sensor is reduced, and even the whole pressure sensor is invalid are solved.

The invention provides a damping liquid silicone rubber material which is obtained by curing a damping liquid silicone rubber raw material composition, and also provides damping liquid silicone rubber and a preparation method thereof. The hardness and strength of the liquid silicone rubber material are improved through filling of the MQ silicon resin and the high-white carbon black, meanwhile, a large number of interface areas are formed by the nano-particles and a matrix, microcosmic slippage of the interfaces is generated under the action of dynamic stress, mechanical energy is converted into heat energy through friction and viscous effects between the interfaces and molecular chains, and damping is improved; according to the invention, by introducing methyl-terminated vinyl silicone oil, a silicone rubber chain forms a large number of suspension chain structures, energy dissipation is enhanced, hydrogen-containing chain extension is carried out at a use end, a main polymer has a longer free molecular chain segment to generate a friction effect, and the damping performance of the liquid silicone rubber material is further improved. Experimental results show that the liquid silicone rubber provided by the invention has excellent damping, mechanical and other properties under high hardness.

The invention relates to the field of shoe sole gluing, in particular to a shoe sole gluing device which comprises a processing base, the top end of the processing base is rotationally connected with a processing table, three positioning grooves are formed in the top face of the processing table in an annular array mode, and the positioning grooves are used for positioning shoe soles to be glued; the lifting plate is arranged above one of the positioning grooves, and a rail groove matched with the outline of a shoe sole to be glued is formed in the bottom of the lifting plate; by arranging the triangular frame and the adhesive tape, the adhesive tape moves along the inner side face of the shoe sole to be glued, dust and impurities attached to the inner side face of the shoe sole to be glued are removed, a viscous adhesive film is left while the dust is reduced, and glue can be prevented from flowing downwards under the viscous effect of the residual adhesive film; glue on the contact surface of the sole and the upper stays on the inner side surface of the sole, so that adhesion of the sole and the upper is facilitated, and cracking and degumming are reduced.

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.

The invention relates to the technical field of fluctuation amplitude identification, in particular to a shafting load fluctuation amplitude identification method in combination with a host working state, which comprises the following steps of: acquiring a dynamic load signal, a host lubricating oil temperature signal and a host rotating speed signal of a shafting monitoring point in real time; and calculating a viscous compensation coefficient according to the host lubricating oil temperature signal and the host rotating speed signal, and performing viscous effect compensation on the dynamic load signal to generate a compensated load signal. According to the method, a temperature and rotating speed combined driving viscosity compensation model is constructed, so that effective correction of additional errors caused by lubricating state changes in a dynamic load signal of a shafting is realized, and a combined modeling mode of a strain-load conversion coefficient and a temperature compensation item is introduced; and the viscosity compensation coefficient is automatically calculated according to the working condition of the host, so that the physical consistency and the data accuracy of the load signal under the low-temperature and low-speed working condition can be remarkably improved, and the problem of load amplitude drift caused by a viscosity error is reduced.

The invention relates to the technical field of sound absorption and noise reduction, in particular to an anti-impact sound absorption and noise reduction lattice superstructure which comprises an array formed by connecting a plurality of sound absorption cavities, each sound absorption cavity is a truncated octahedron formed by a plurality of panels, and the panels comprise eight regular hexagonal panels and six quadrilateral panels. The two adjacent edges of every two adjacent panels are connected through a hollow truss, and a micro hole is formed in the center of each panel. According to the adjustable Helmholtz resonator, the hollow structure is introduced, stress concentration at truss nodes is effectively reduced, the panels are arranged between the adjacent trusses, an internal air phase is constructed through the micropore design, the sound absorption frequency band of the structure is widened, the sound impedance of the structure can be adjusted through the micropores, and therefore the multiple complete adjustable Helmholtz resonators are formed; when the frequency of incident sound waves is close to the inherent frequency of the resonator, the air columns in the micropores generate strong vibration, sound energy is consumed due to the thermal viscosity effect, and the sound absorption and noise reduction structure can have good sound absorption and energy absorption effects while having good mechanical performance.

The invention discloses a thermal flow velocity sensor and a preparation method thereof, the thermal flow velocity sensor comprises a sensing chip, an interlayer and a cover plate, the sensing chip comprises a chip body, a heating unit, a temperature sensing unit, a temperature compensation resistor and an environment temperature resistor, and a microfluid pipeline is formed among the interlayer, the chip body and the cover plate and is communicated with the outside; according to the invention, the double heating units are combined with the microfluid pipeline, and the blocking and viscous effects of the microfluid pipeline are utilized to convert the high external flow velocity into the slow flow velocity in the microfluid pipeline for measurement, so that the sensing range of the thermal flow velocity sensor to the flow field flow velocity signal is greatly increased; and on the other hand, under the low flow velocity of the fluid, the temperature sensing unit exposed in the external flow field and the temperature compensation resistor form a bridge circuit to measure the flow velocity, and the thermal flow velocity sensor has very high sensitivity to the change of the flow velocity, so that the thermal flow velocity sensor has the huge advantages of high sensitivity and wide range.

The invention belongs to the technical field of transformers, and particularly relates to a dry-type transformer which comprises a shell, a sealing door is arranged on one side of the shell, and a transformer body is mounted in the shell; a water storage tank is formed in the shell and used for storing water, and the water is used for reducing noise when the transformer body works; a water inlet groove is formed in the top surface of the shell, and the water inlet groove is communicated with the water storage groove; the water storage tank is filled with water, then the end opening of the water storage tank is sealed by means of the sealing plate, at the moment, when noise generated during working of the transformer body is spread in water, a large amount of sound energy is consumed through friction and viscous effects of sound waves and water molecules, spreading of the sound waves can be greatly hindered, and therefore the noise reduction effect is achieved; and meanwhile, the water can absorb heat generated when the transformer body works, so that the cooling effect is achieved.

The invention discloses a sound-absorbing rubber material and a preparation method thereof, and belongs to the technical field of rubber preparation. The method comprises the following steps: mixing latex with micro-nano spherical hollow powder, centrifugally stirring in vacuum, mixing with raw natural rubber and a processing aid for banburying, then carrying out open milling, adding a vulcanizing agent, extruding, and finally vulcanizing to obtain the rubber. A micro-nano spherical hollow powder material treated by latex is introduced in the rubber production process, so that sound waves enter the material through a surface perforated structure on the premise of ensuring that the mechanical property of the rubber material meets the use requirements, and are continuously reflected and propagated in an internal hollow structure, air in pores vibrates, and the mechanical property of the rubber material is improved. And through the viscous effect and the heat conduction effect, sound wave energy is converted into heat to be lost, and therefore the effects of sound absorption and noise reduction are achieved.

The application provides a method for determining the structural temperature field and thermal deformation of a compressor rotating disc cavity, which can be applied to the technical field of heat analysis of turbomachinery. The method comprises the following steps: obtaining the geometric parameters, operating parameters and working substance property parameters of the gas in the disc cavity; based on the balance between the buoyancy effect and the viscous effect driven by the centrifugal force, the average heat flux density of the outer ring cover of the disc cavity is obtained according to the outer ring cover radius, the axial gap of the disc cavity, the rotating disc speed, the outer ring cover temperature, the rotating core zone temperature, the Prandtl number, the density, the dynamic viscosity and the thermal conductivity; based on the heat conduction analogy relationship of the laminar Ekman boundary layer, the local heat flux density of the rotating disc is obtained according to the rotating disc speed, the kinematic viscosity, the thermal conductivity and the difference between the rotating disc temperature and the rotating core zone temperature; and the structural temperature field distribution and the thermal deformation of the rotating disc cavity are obtained according to the average heat flux density of the outer ring cover of the disc cavity and the local heat flux density of the rotating disc.

The invention discloses a wave rider shape approximate optimization method based on an agent model. According to the method, the parameterized shape of the waverider is established and passivated by adopting the CST method, the three-dimensional viscous effect and the front edge passivation effect of the shape of the waverider are considered, and the flight surface grid local parameters are generated by adopting the Jacobian conversion method, so that automatic updating of the waverider space grid in the optimization process is realized; then, the aerodynamic / thermal characteristics of the waverider are calculated based on a Reynolds average Navier-Stokes equation (RANS); the method comprises the following steps: constructing a waverider shape optimization problem by taking the maximum lift-drag ratio as an optimization target, solving the optimization problem by adopting an agent model assisted constraint optimization algorithm, and circularly selecting new sample points to update an agent model based on a certain point adding criterion in the solving process until approximate optimization convergence. According to the method, the optimization efficiency can be effectively improved, the design period is shortened, and optimization and modification of the wave rider shape scheme can be rapidly achieved in the overall design stage.

The present invention provides a laminar flow fan. The laminar flow fan includes: a plurality of annular discs, which are arranged in parallel with each other and have the same central axis; a circular disc, the center of which is formed with a hub facing the plurality of annular discs, and a groove is defined inside the hub; a connecting plate, which connects the plurality of annular discs to the circular disc; a motor is provided in the groove, which directly drives the circular disc to rotate, and then the circular disc drives the plurality of annular discs to rotate, so as to form laminar wind by utilizing the viscous effect; a plurality of centrifugal blades perpendicular to the annular discs are provided on the outer side of the peripheral wall of the hub, which are configured to accelerate the air flow to between the plurality of annular discs when rotating. The laminar flow fan of the present invention realizes laminar air supply through the viscous effect, and the air supply process has low noise and high air volume; the centrifugal blades increase the air volume entering the laminar flow fan, thereby improving the working efficiency of the laminar flow fan, and the outer annular discs can effectively block the noise generated by the centrifugal blades in the middle.

The utility model relates to the technical field of sound insulation boards, and provides a sound insulation board capable of improving the sound insulation effect of a house, which comprises a main board, a sound insulation layer and a back board, the main board is assembled and connected with the back board through the sound insulation layer, two sides of the sound insulation layer are respectively assembled and connected with the main board and the back board through cork layers, and the interior of the sound insulation layer is of a hollow structure. A plurality of honeycomb cylinders are arranged in the sound insulation layer, the honeycomb cylinders form a honeycomb structure, micropores are formed in the sound insulation layer right above the honeycomb cylinders, pyramids are arranged on the lower portions in the honeycomb cylinders, slope tops are arranged at the upper ends of the pyramids, and silencing grooves are formed in the surfaces of the pyramids. After sound enters the sound insulation layer, the sound is reflected for multiple times among the honeycomb cavities, the pyramids and the silencing grooves, so that part of sound wave energy is converted into heat energy, the glass wool layer on the surface of each pyramid is made of porous sound absorption materials, when the sound makes contact with the glass wool layer, the sound is dissipated due to the air viscous effect and internal reflection, and the sound insulation effect is further improved.

The utility model relates to the technical field of pressurized building air exhaust, in particular to a silencer and an air exhaust system suitable for pressurized building air exhaust, which comprise a silencer body, and a first vibration isolation and noise elimination layer and a second vibration isolation and noise elimination layer are sequentially arranged in the silencer body from inside to outside. The first vibration isolation and noise elimination layer is connected with the inlet end of the silencer body to form an inner cavity. The first vibration isolation and noise elimination layer is connected with the inner wall of the silencer body, the second vibration isolation and noise elimination layer is connected with the inner wall of the silencer body, an outer cavity is formed between the first vibration isolation and noise elimination layer and the second vibration isolation and noise elimination layer, and high-pressure gas entering from the inlet end of the silencer body sequentially passes through the inner cavity, the first vibration isolation and noise elimination layer, the outer cavity and the second vibration isolation and noise elimination layer and then is exhausted outdoors. According to the silencer, the two vibration isolation silencing layers and the silencing cavities are arranged, the viscous effect of gas is enhanced, the overall silencing capacity of the silencer is improved, and exhaust noise in a pressurized building is effectively restrained.

The invention discloses a dynamic regulation and control system and method for friction force of a servo cylinder. The dynamic regulation and control system is characterized in that a dynamic sealing pair of the servo cylinder is provided with a magneto-rheological elastomer dynamic seal; a magnetizing device is arranged on one side of the magneto-rheological elastomer dynamic seal, an axial positioning sensor is arranged on the servo cylinder, the magnetizing device is connected with a magnetic control unit, and the axial positioning sensor is connected with the magnetic control unit; the magnetic control unit judges whether the dynamic sealing pair area of the servo cylinder is in the starting stage or not through the axial positioning sensor and controls the magnetizing device to regulate and control the magnetic field intensity according to the judgment result. The problems of creeping and shaking of the servo hydraulic cylinder caused by the viscous effect of elastomer sealing in the starting process can be solved, and the displacement control precision of the servo cylinder is improved.

The utility model relates to the technical field of viscous material preparation, in particular to a raw material proportioning device for preparing a laser label viscous material, which comprises a proportioning box body, a cover plate is mounted at the top of the proportioning box body, a feed port is mounted at the top of the cover plate in a penetrating manner, an adjusting component is mounted at the top of the cover plate and is positioned right above the feed port, and the adjusting component is positioned right above the feed port. A push block is mounted in the top center of the adjusting assembly; the raw material proportioning device for preparing the laser label viscous material has the beneficial effects that the adjusting assembly and the push block are matched for use, so that the adjusting assembly can conveniently drive the push block to move up and down in the feeding hole, and the raw material proportioning device is convenient to use when different raw materials are added every time; and residual raw materials adhered to the side wall of the feeding hole are fed into the proportioning box body by using the push block, so that the situation that the viscosity effect is influenced due to insufficient concentration of the viscous material caused by lack of the added dosage is avoided.

The present invention provides a laminar flow fan. The laminar flow fan includes: a plurality of annular discs, which are arranged in parallel with each other and have the same central axis; a motor, which is configured to drive the plurality of annular discs to rotate, so that the plurality of annular discs are in contact with the air between each other and move relative to each other, thereby causing the air boundary layer close to the surface of the plurality of annular discs to be driven by the rotating plurality of annular discs to rotate from the inside to the outside due to the viscosity effect to form a laminar wind; blades, which penetrate the plurality of annular discs, wherein the cross section of the blades has two sections of curves arranged in sequence along the direction of rotation of the annular discs, and the chord length of the two sections of curves is linearly related to the air volume of the laminar flow fan. The laminar flow fan of the present invention can increase the air volume and air pressure of the laminar flow fan by increasing the chord length of the blades, thereby promoting laminar air circulation; laminar air supply is achieved through the viscosity effect, and the air supply process has low noise, high air volume and high air pressure.

The invention relates to the technical field of aerospace, in particular to a supersonic aircraft unsteady aerodynamic force prediction method considering a viscous effect, which comprises the following steps: establishing a CFD model of an analysis object, solving an N-S equation, and exporting near wall surface flow field parameters; on the basis of the near wall surface flow field parameters, radial basis function interpolation is adopted to obtain flow field parameters at any distance in the normal direction of the wall surface; based on the parameters of the flow field at any distance along the normal direction of the wall surface, solving a boundary layer thickness equation by using a Stevanson iteration method to obtain an effective shape of the aircraft; based on the effective shape of the aircraft, solving unsteady aerodynamic force under given displacement and speed boundary conditions by adopting a three-dimensional discretized local flow piston theory; according to the method, the calculation efficiency and calculation precision of the unsteady aerodynamic force can be improved.

The invention provides a composite shape memory epoxy polymer as well as a preparation method and application thereof. The preparation method of the composite shape memory epoxy polymer comprises the following steps: uniformly mixing a water-borne epoxy resin emulsion and a curing agent system A, and heating and curing to obtain a first cured body; uniformly mixing water-borne epoxy resin emulsion with the curing agent system B, and heating and curing to obtain a second cured body; and finally, mixing the first cured body and the second cured body to obtain the composite shape memory epoxy polymer. The preparation method comprises the following steps: firstly, preparing epoxy resin with high and low glass transition temperatures by adopting a water-based epoxy emulsion, and then adding an epoxy polymer layer with lower glass transition temperature, high toughness and high viscosity and an epoxy polymer layer with higher glass transition temperature and high strength into the water-based epoxy emulsion; and forming a low-activation high-viscosity-high-activation high-strength-low-activation high-viscosity composite layer, and performing high-temperature hot pressing at the temperature higher than the shape memory activation temperature to form the shape memory sheet. After the sheet is cooled to normal temperature and pressure is released, the surface viscous layer is cured to lose the viscous effect, and the sheet is easily dispersed in water-based or oil-based drilling fluid and also easily enters a leakage channel.

The invention relates to the technical field of device heat dissipation, in particular to a power electronic module heat dissipation structure which comprises a heat dissipation substrate, a power electronic module installation face is arranged on one side of the heat dissipation substrate, a heat exchange component is fixed to the other side of the heat dissipation substrate, and at least one medium flow channel is formed in the heat exchange component. A plurality of protrusions are arranged in the medium flow channel in the medium flowing direction at intervals, and the free ends of the adjacent protrusions are opposite in pointing direction. The liquid viscous effect on the surface of the heat dissipation substrate can be reduced, the turbulent flow effect of a cooling medium is enhanced, and the heat exchange efficiency is improved.

The application discloses a jet type elastic ring extrusion oil film damper. The damper is arranged at a rotor bearing support position and mainly comprises a bearing seat, an outer oil film bushing, an elastic ring, a jet device and a bearing outer bushing. In the damper, the damping and vibration reduction effect is achieved by the flow of lubricating oil under the deformation of the elastic ring, the exchange of the flow among the jet device, the outer oil film and the oil cavity and the viscous effect. Compared with general elastic ring extrusion oil film dampers, the damper can not only improve the speed gradient of lubricating oil and the energy dissipation rate by using the jet device, but also can avoid stress concentration on the elastic ring to ensure a long service life of the structure. The damper has the advantages of compact structure, high damping and adjustable damping performance by changing the structural parameters of the jet device.

The invention provides a method and a device for determining an entrainment area. Relates to the technical field of aero-engine cooling, and the entrainment area determination method comprises the following steps: determining Lamm vectors of airflow at a plurality of spatial points according to vorticity and speed of the airflow at the plurality of spatial points in a vortex field; the vortex field is generated by entrainment of a cold air jet flow ejected by a first air film hole in a turbine blade on a main flow; dividing a first entrainment area in the vortex field based on the pointing direction of the Lamm vector of the airflow in the vortex field at the plurality of spatial points; dividing a second entrainment area in the vortex field based on the pointing direction of the speed of the airflow in the vortex field at the plurality of space points; dividing a third entrainment area in the vortex field according to a space point of the viscous effect of the cold air jet flow on the main flow in the vortex field; and obtaining a target entrainment area based on the first entrainment area, the second entrainment area and the third entrainment area.

The present invention provides an integrated air conditioner, comprising: a housing, which is internally partitioned into an indoor side and an outdoor side, and an indoor air inlet and an indoor air outlet are formed on the housing on the indoor side; a laminar flow fan, which is arranged inside the indoor side and forms an air inlet channel; and a wind shield, which is arranged outside the laminar flow fan and is located between the housing and the laminar flow fan, and defines a notch; wherein the laminar flow fan is configured such that indoor air reaches the air inlet channel through the indoor air inlet, the laminar flow fan disturbs the indoor air entering the air inlet channel through a fluid viscosity effect to form a laminar flow of air, and the laminar flow of air sequentially flows out of the housing through the notch and the indoor air outlet to reach the indoor. The integrated air conditioner of the present invention has low noise and good user experience.

The present invention provides a wall-mounted air conditioner indoor unit. The wall-mounted air conditioner indoor unit includes: a shell, a cavity is defined inside the shell, and an air outlet is defined at the front of the shell; a laminar flow fan is arranged inside the cavity, and includes: a plurality of annular discs, which are arranged in parallel and spaced apart from each other and have the same central axis, and the centers of the plurality of annular discs jointly form an air inlet channel, and the air in the cavity enters the gaps between the plurality of annular discs through the air inlet channel; and a laminar flow motor, which is configured to drive the plurality of annular discs to rotate so that the air boundary layer close to the surfaces of the plurality of annular discs rotates and moves from the inside to the outside, thereby forming laminar wind that is blown out from the air outlet. The wall-mounted air conditioner indoor unit of the present invention is provided with a laminar flow fan, which realizes laminar air supply through the viscosity effect, and the air supply process has low noise and high air volume, which effectively improves the user experience.

The invention discloses a lift limiter, an exhaust valve, a compressor and refrigeration equipment, the lift limiter is used for being arranged on one side of a valve plate, the lift limiter comprises a mounting section, a transition section and a lift limiting section which are connected in the first direction, the mounting section is used for being connected with a mounting part of the valve plate, and the transition section is used for being connected with the lift limiting section; the lift limiting section is used for limiting the maximum lift of the head of the valve block, an oil guide structure is arranged on the side, facing the valve block, of the transition section and used for guiding lubricating oil between the transition section and the valve block to move in the second direction, and the second direction is different from the first direction. According to the technical scheme, the viscous effect of lubricating oil between the lift limiter and the valve plate can be reduced when the valve plate is closed, and the quick-opening and quick-closing performance of the valve plate is improved.

The embodiment of the invention provides an ultra-micro-pore composite sound absorption and insulation board. The ultra-micro-pore composite sound absorption and insulation board comprises an ultra-micro-pore sound absorption board, a first non-woven fabric layer, an aluminum honeycomb core layer, a first-pore-diameter aluminum board, a centrifugal glass sound absorption cotton layer, a second non-woven fabric layer and a second-pore-diameter aluminum board. The upper end of the ultra-micropore acoustic board is provided with a triangular cloth grain stretching hole and a micro-wave structure, so that first-wave acoustic energy absorption is realized; the aluminum honeycomb core layer attenuates second wave sound energy through cavity resonance and a particle viscous effect; the first aperture aluminum plate and the second aperture aluminum plate are combined with the centrifugal glass wool layer to further absorb residual sound waves. The multilayer structure has a synergistic effect, has broadband (especially low-frequency) efficient sound absorption performance, has the characteristics of high bending resistance, compressive strength and light weight, and is suitable for occasions with harsh mechanical load and acoustic environment, such as industrial factory buildings, traffic facilities and the like.

The utility model provides an assembly type building prefabricated wallboard with an anti-seismic energy dissipation structure, and relates to the technical field of building prefabricated wallboards, the assembly type building prefabricated wallboard comprises a front wallboard main body, the rear end face of the front wallboard main body and the front end face of a rear wallboard main body are fixedly installed and connected through an adhesive, and at the moment, a rear containing groove and a front containing groove jointly form a sound absorption energy dissipation cavity; sound waves enter the sound absorption cavities with the interior being of a spherical structure, the incident sound waves are subjected to the total reflection effect through the inner circumferential arc faces of the spherical cavities, and sound energy is converted into heat energy to be consumed through multiple times of reflection attenuation of the sound waves in the cavities in combination with the friction of the wall faces of the cavities and the viscous effect of air media; a continuous acoustic conduction network is formed, after sound waves are reflected for multiple times in a single spherical cavity, part of energy enters the adjacent cavities through the sound conduction reflection holes, the cross-cavity linkage reflection energy consumption process is triggered, and the problem that the sound wave treatment capacity of a traditional prefabricated wallboard is limited, and the comprehensive requirement of a building cannot be met is solved.

The invention relates to the technical field of runout detection, and particularly discloses a pump shaft runout detection device which comprises a working condition simulation unit, a working condition switching unit and a disturbance triggering unit. Simulation and switching of multiple core working conditions of stable operation, load abrupt change and start-stop viscosity of the pump shaft assembly are achieved through the working condition simulation unit, the working condition switching unit and the disturbance triggering unit. Through the periodic pulsation impact of the transient impact disturbance part, the transient impact load generated by the sudden load change on the pump shaft assembly is simulated; through periodic pulsation impact of the transient variable acceleration disturbance member, a special jumping working condition caused by a friction viscous effect in a starting or stopping process of the pump shaft assembly is simulated. Performance and safety of the pump shaft assembly under different working conditions can be comprehensively evaluated, and the goodness of fit between test data and actual working conditions is improved.

The invention relates to a flotation particle and bubble mineralization behavior detection device, belongs to the technical field of mineral flotation, and solves the problem that test equipment in the prior art does not conform to an actual flotation environment due to few test factors. The device comprises a test system, a water circulation system and a shooting system. The test system comprises a top cover driving square cabin, a connecting channel and a fluidization tank, wherein the lower end of the top cover driving square cabin is connected with the top of the fluidization tank through the connecting channel; the water circulation system communicates with the top cover driving square cabin, and the shooting system is used for shooting mineralization behaviors of particles and bubbles in the top cover driving square cabin. Flowing fluid is applied to the top of the square cabin driven by the top cover, due to the influence of boundary conditions, the fluid layer close to the top cover moves firstly, then the motion is transmitted to the fluid layer below through the viscous effect, and along with flowing development, one or more vortexes with different rotating directions can be formed in the cavity, so that the fluid layer can rotate in the cavity. And different flow field structures and strengths can be simulated.

The application discloses a kind of gas electromechanical inerter energy feeding device for wheel hub drive car, including gas type inerter, linear motor connected with gas type inerter, the buffer stroke chamber is also equipped between gas type inerter and linear motor, the upper welding of gas type inerter has upper lifting ring, the lower welding of linear motor has lower lifting ring.The beneficial effects of the present application are that the gas electromechanical inerter energy feeding device for wheel hub drive car is coupled by gas electromechanical inerter and linear motor, the flow inertia of fluid in spiral copper pipe is used to realize the effect of inerter, compared with liquid inerter, it has higher linearity degree;The hydraulic oil in its spiral copper pipe is only in two liquid plugs, i.e.the hydraulic oil flows within a certain range, and will not flow into the cylinder, the viscous effect is weakened, and the power loss is greatly reduced.