15 results about "Viscous shear" patented technology

The invention relates to the technical field of hydrodynamic analysis of ship and ocean engineering, in particular to a method, a device and equipment for predicting an additional mass coefficient and a viscous damping coefficient of multi-degree-of-freedom movement of a floating body, a storage medium and a computer program product. The method comprises the following steps: performing orthogonal two-dimensional slicing on each plane to generate flow field sampling points based on a floating body three-dimensional geometric model, draft and motion parameters; sampling point coordinates, initial flow field data, geometric contour discrete points, boundary conditions and motion parameters are coded into high-dimensional feature vectors through a learnable matrix, and input matrixes of all planes are constructed; predicting two-dimensional flow field data by adopting a Transform module, fusing multi-plane data through a graph attention network to generate a redundant three-dimensional flow field, and interpolating and complementing object plane missing points; the water pressure and the viscous shear force are divided along the surface area of the floating body, the inertia term and the damping term are decomposed in combination with the single-mode motion equation, the target additional mass coefficient and the target viscous damping coefficient are determined, and the accuracy of floating body hydrodynamic calculation is improved.

The invention discloses a bidirectional crescent upstream pumping groove end face mechanical seal which comprises a sealing ring. Different from the prior art, a plurality of upstream pumping groove groups and downstream pumping groove groups are arranged on the sealing surface of the sealing ring, the upstream pumping groove groups and the downstream pumping groove groups are alternately distributed on the sealing ring, and a sealing weir is formed between each upstream pumping groove group and the adjacent downstream pumping groove group. The crescent upstream groove structure can enable a fluid medium to be leaked from the upstream side of the downstream groove, on one hand, leakage of the fluid medium to the inner diameter side can be reduced, the sealing performance is improved, on the other hand, viscous shear heat of fluid on the sealing face can be dissipated in time, and small temperature rise of the sealing face is maintained. Meanwhile, a fluid medium can flow in a wave shape along the crescent flow channel in the adjacent upstream groove and downstream groove, a layer of stable fluid film is maintained between the sealing faces, the lubricating state of the sealing faces is improved, and temperature rise and friction torque of the sealing faces are reduced.

The invention discloses a distribution metering valve group prying device for carbon dioxide injection, and relates to the technical field of distribution prying. The carbon dioxide injection distribution metering valve group prying device comprises a base, and the top of the base is fixedly connected with a buffer supporting block. According to the distributing and metering valve group prying device for injecting the carbon dioxide, when a vortex blade rotor and a three-axis acceleration sensor are arranged to detect that the device vibrates in the vertical direction, a connecting rotating column block moves in a buffering supporting block, and the vortex blade rotor and silicone oil generate viscous shearing, so that the influence of vibration on the device is relieved; compared with traditional rigid buffering only depending on a spring, the mode effectively avoids the situation that the device is damaged due to local stress concentration of a buffering structure, silicone oil is extruded and flows towards a third connecting pipeline along a second threaded groove in cooperation with arrangement of a second connecting pipeline, damage to the device caused by vibration is further relieved through resistance of the silicone oil, and the service life of the device is prolonged. The working efficiency of the device is ensured.

A brush seal device for suppressing buoyancy disturbance effects includes a Rayleigh stepped groove structure on the axial inner surface of a front baffle. The number of Rayleigh stepped groove structures is evenly distributed along the circumference. This invention innovatively designs the Rayleigh stepped groove structure on the inner surface of the front baffle. When a high-pressure flow enters the Rayleigh stepped groove structure, it creates a velocity gradient in the airflow, generating viscous shear stress. Furthermore, the airflow velocity increases at the converging portion of the Rayleigh stepped groove structure, further forming local dynamic pressure. Through this dynamic pressure effect, a stable air film can be formed between the front row of brush filaments and the front baffle. By limiting the deformation of the front row of brush filaments, brush filament buoyancy is suppressed, thereby achieving the purpose of suppressing the brush filament buoyancy disturbance effect and ultimately improving the dynamic sealing performance and service life of the brush seal.

This invention discloses a non-contact hydraulic sealing device based on the hydrodynamic effect of spiral grooves, aiming to solve the problem of dry friction damage between the spiral groove surface and the smooth surface of the stationary ring during the start-up and shutdown phases of pump equipment. The device includes a rotating ring, a stationary ring, a secondary ring, and a locking mechanism. During initial startup, the secondary ring rotates under the viscous shear force of the rotating ring, effectively transferring mechanical friction to a preset wear-resistant surface, protecting the core spiral groove from high temperature and wear. When the rotational speed reaches a preset threshold, the locking mechanism is hydraulically or electromagnetically driven, braking through a piston and locking block, causing the secondary ring to transition from a rotating state to a stationary locked state. At this time, a momentary speed jump occurs between the rotating ring and the secondary ring, guiding the spiral groove to quickly establish a high-rigidity liquid film, achieving stable and reliable non-contact operation. This invention, by introducing a secondary ring and coordinating with locking and braking control, achieves friction transfer, protects the core working surface, and achieves a protective effect on the core hydraulic sealing structure.

The utility model relates to a damping-force-adjustable stay cable viscous shear damper with a limiting and spill-proof device, which comprises an upper box body, a stay cable connecting part is arranged at the upper part of the upper box body, a dustproof shell is arranged at the lower part of the upper box body, a damping plate is arranged in the middle of the dustproof shell, a lower box body is sleeved in the dustproof shell in a sliding manner, and the lower box body comprises a damping liquid shell. The damping liquid shell is sleeved with the dustproof shell, the damping plate is arranged in the damping liquid shell in a sliding mode, and damping liquid is injected into the damping liquid shell. According to the utility model, through the internal friction among molecules of the macromolecular viscous damping liquid filled between the upper box body and the lower box body, the movement energy is converted into heat energy to be dissipated, so that the damping effect is achieved. The interior is of a non-sealing structure, no working pressure exists, no sealing ring is arranged, working is reliable, and the service life is long; when the inhaul cable is subjected to unpredictable wind and rain vibration or vehicle-mounted vibration, the installation position of the damper is prevented from deviating, and viscous damping liquid is prevented from wriggling and overflowing due to forced wriggling.

The utility model relates to a testing device for testing the liquid replacement rate of a barrier explosion suppression material. The testing device comprises a medium container used for containing a to-be-tested barrier explosion suppression material and liquid; the rotary driving device is connected with the medium container, and drives the medium container to rotate through the rotary driving device so as to increase the flow speed and pressure of the liquid, so that the speed of the liquid infiltrating the to-be-tested barrier explosion suppression material is increased; and the porous limiting plate is mounted in the medium container so as to fix the to-be-tested barrier explosion suppression material. A supergravity environment is created in a high-speed rotation mode, the surface tension of liquid is reduced, the liquid deforms and is forced to flow through the porous layer of the blocking explosion suppression material under the action of viscous shearing force and turbulent shearing force, and the liquid is prevented from flowing through the porous limiting plate in combination with the limitation of the porous limiting plate. And the method is suitable for rapid determination of the liquid replacement rate of the barrier explosion suppression material prepared by various processes, especially a foaming method.

The present invention relates to a test device and a test method for the fluidity of an adhesive, belonging to the technical field of adhesive performance testing. A test device for the fluidity of an adhesive includes: a container for adding the adhesive to be tested; a stirring motor for providing the power for stirring; a test hollow tube, the upper end of which is fixedly connected to the output end of the stirring motor, and the axis of which overlaps with the rotation axis of the output end, and the test hollow tube is vertically inserted into the adhesive to be tested; a timing unit for calculating the climbing time; and a height measuring unit for measuring the climbing height. The present invention also provides a test method for the fluidity of an adhesive. When the adhesive to be tested is stirred by the test hollow tube, due to the viscous shear stress between the liquid of the adhesive itself and the contact surface, the adhesive will exhibit the phenomenon of rod climbing, causing the liquid level inside the test hollow tube to be higher than the liquid level of the container. The tester can quantitatively characterize the fluidity of the adhesive by measuring with the timing unit and the height measuring unit.

The invention discloses a magnetic liquid damping shock absorber with a texture on the surface of a permanent magnet. The magnetic liquid damping shock absorber structurally comprises magnetic liquid, the permanent magnet with the texture on the surface, a shell, an end cover, a sealing ring, a bolt, a nut and the like. The shell and the end cover are connected through the bolt and the nut and are sealed through the sealing ring to form a complete cavity, and the magnetic liquid and the permanent magnet are located in the cavity. On the basis of the second-order suspension characteristic of the magnetic liquid, the permanent magnet is suspended in the magnetic liquid, and when the system vibrates, the permanent magnet performs viscous shearing motion so as to dissipate energy causing vibration. The surface of the permanent magnet is provided with the texture, the magnetic induction lines are mainly concentrated on the edges of the polygon, when vibration occurs, larger damping force can be generated, an additional velocity field is generated in the magnetic liquid, and therefore a better vibration reduction effect is achieved.

The application discloses a bidirectional crescent upstream pumping type groove end face mechanical seal, which comprises a sealing ring. Different from the prior art, a plurality of upstream pumping groove groups and downstream pumping groove groups are arranged on the sealing surface of the sealing ring, the upstream pumping groove groups and the downstream pumping groove groups are alternately arranged on the sealing ring, and a sealing weir is formed between adjacent upstream pumping groove groups and downstream pumping groove groups. The upstream groove structure in the crescent shape can reduce the leakage of the fluid medium to the inner diameter side, improve the sealing performance, and timely dissipate the viscous shear heat of the sealing surface fluid, so that the temperature rise of the sealing surface is small. Meanwhile, the fluid medium can flow in a "wave shape" along the crescent-shaped flow channel in adjacent upstream grooves and downstream grooves, a stable fluid film is maintained between the sealing surfaces, the lubrication state of the sealing surface is improved, and the temperature rise and the friction torque of the sealing surface are reduced.

The present invention discloses a method for calculating the stiffness of a silicone oil torsional vibration damper housing, and the specific steps are as follows: S1. Assume that the space between the shock absorber housing and the shock absorber inertia ring is filled with a fluid with a viscosity of , and rotates at a constant relative angular velocity. According to Newton's viscosity law, the viscous shear stress at the shock absorber housing radius of is: and the viscous shear stress formulas of the five regions are obtained; S2. When the shock absorber is working, according to the viscous shear stress formulas of the five regions, the torque diagrams of the five regions of the housing can be drawn, from the outer ring ⑤ → the right side wall ④ of the annular ring → the left side wall ③ → the inner ring ② → the right side wall ① of the center hole. By deducing the value of the torque, it can be known that the torsional amplitude of the upper left corner of the shock absorber housing is the largest; the shock absorber housing stiffness is calculated by the formula. The silicone oil torsional vibration damper housing stiffness calculation method of the present invention can adapt to a variety of silicone oil torsional vibration damper sizes, does not require finite element analysis to obtain the housing torsional stiffness, is suitable for programming calculation, and the calculation result differs from the finite element method calculation by about 2%.

The application discloses a rotating pair water film self-adaptive establishing and stabilizing method and structure, which is suitable for passive regulation of a water film of a relative rotating pair of underwater equipment. The method realizes the whole process of film establishment, film stabilization and film elimination by relying on the coupling of the geometric characteristics of the structure itself, rotating speed and water flow, and does not need external active control devices. The structure comprises a fixed fitting part and a rotating fitting part, and the fitting surface adopts an axial segmented same-taper conical surface, wherein the water outlet section is a water outlet converging conical surface, and the water inlet section is a water inlet gap conical surface, which has the functions of throttling damping and thermal expansion compensation, and is provided with an axial limiting structure to reduce reverse impact. The water outlet converging conical surface forms a dynamic pressure water film to realize non-contact support during normal rotation, and relies on viscous shear flow and boundary lubrication to avoid dry friction during reverse rotation by the axial limiting structure. The application overcomes the shortcomings of traditional directional groove structures, such as being suitable for only one-way rotation and poor low-speed performance, and has simple and reliable structure, can be compatible with a silt-resistant structure, and is suitable for various underwater rotating support devices.

The invention relates to the technical field of hydraulic control systems, in particular to a hydraulic power equipment control system and hydraulic power equipment thereof. The hydraulic power equipment comprises a shell assembly, a power assembly, a flow guide adjusting assembly and a hydraulic adjusting assembly. Efficient pressurization and rapid oil supply can be achieved, the stability and response speed of system power output are guaranteed, in addition, hydraulic pressure can be rapidly and stably adjusted, the pressure requirements under different working conditions are met, meanwhile, heat generated by viscous shearing friction between the outer surface of the plunger type cylinder and oil can be effectively taken away, and the service life of the plunger type cylinder is prolonged. Uniform cooling of a lubricating system is achieved, local overheating is prevented, the operation reliability of equipment is improved, the service life of the equipment is prolonged, the flowing direction and the flowing speed of lubricating oil can be synchronously adjusted according to needs, efficient circulation of the lubricating oil in the hollow cavity is ensured, the cooling effect is adjusted, mechanical friction and heat accumulation are reduced, and energy consumption and abrasion are reduced. The service life of equipment is prolonged.

The application discloses a damper-adjustable type cable-stayed cable viscous shear damper, which comprises a casing body, an auxiliary installation positioning mechanism is arranged at the bottom of the casing body, a cable-stayed cable is connected to the top of the casing body through bolts, a first cable clamp and a second cable clamp are sequentially and fixedly arranged on the surface of the cable-stayed cable from bottom to top, and a damper connecting mechanism is arranged at the left side of the bottom of the cable-stayed cable. Through the cooperation of the first cable clamp, the cable-stayed cable, the second cable clamp, the first connecting rod, the second connecting rod and the connecting shaft pin, the double-cable-clamp double-point connection is adopted, the distance between the double cable clamps is reasonably arranged, the cable clamp position is adjusted, at least one installation point is ensured to avoid the zero displacement point of the high-order vibration mode, the cable-stayed cable can transmit sufficient displacement and speed to the external damper, the effective vibration of the damper is excited, and the damper can provide sufficient additional damping to the cable-stayed cable to inhibit the high-order vibration.

The application discloses a kind of controllable temperature micro rib surface turbulent flow suppression and fluid viscosity regulation composite drag reduction method, belong to the field of fluid dynamics surface drag reduction technique;The application is set to extend along the flow direction micro rib structure on the surface of substrate, which on the one hand lifts near-wall turbulent vortex, reduces reynolds shear stress, on the other hand forms low inertia stable flow area between ribs and inhibits convection heat transfer, provides stable thermal boundary layer carrier for temperature control. The temperature of micro rib surface is adjusted by temperature control unit: for gas working substance, cooling is used to reduce near-wall viscosity, for liquid working substance, heating is used to reduce near-wall viscosity, so as to reduce viscous shear stress. Micro rib structure inhibits the destruction of outer layer turbulent flow to temperature boundary layer, so that low viscosity layer is stably maintained near the wall, and the composite drag reduction effect of synergistic reduction of turbulent stress and viscous stress is realized. The application breaks through the performance limit of single micro rib drag reduction, and can be applied to aviation, navigation, pipeline transportation and other fields.