405 results about "Frictional coefficient" patented technology

The invention discloses a constant-tension self-compensation coating method and an intelligent deviation adjusting method, and belongs to the technical field of material dynamic characteristic on-line testing and cooperative control, and the constant-tension self-compensation coating method comprises the following steps: obtaining stress distribution data of the surface of a coating base material, generating a multi-mode optical data set, analyzing a real-time tension estimated value and material dynamic characteristic parameters, and obtaining a multi-mode optical data set; wherein the dynamic characteristic parameters of the material comprise an equivalent elastic modulus and a surface friction coefficient; generating a dynamic coupling coefficient based on the real-time tension estimation value and the dynamic characteristic parameters of the material, performing analysis and calculation, and outputting a tension compensation control quantity and a deviation adjustment control quantity; and the tension compensation control quantity is executed to adjust the unwinding or winding torque, and meanwhile, the deviation adjusting control quantity is executed to adjust the angle of a deviation correcting guide roller. According to the method, the dynamic characteristics of the material are analyzed in real time by adopting multi-mode optical perception, and the tension deviation coupling model is constructed, so that interference advanced cooperative inhibition and working condition self-adaptive stable coating can be realized.

The invention discloses a gear pair life prediction method based on dynamic stress, belongs to the technical field of reliability design of mechanical transmission systems, and aims to solve the problem of inaccurate life prediction caused by neglecting a dynamic effect and a real surface topography in an existing gear design method. The method comprises the following steps: firstly, acquiring gear pair interface mechanical property parameters considering shafting vibration, dynamic load and surface roughness, wherein the parameters comprise transient oil film pressure, friction coefficient, oil film thickness and shear stress; solving a three-dimensional subsurface stress field by adopting an algorithm and calculating von Mises equivalent stress distribution; stress volume integration is conducted on different rough surfaces, the honed surface is used as the reference, the relative fatigue life of other surfaces is calculated based on the Zaretsky life prediction theory, and accurate prediction and process optimization of the contact fatigue life are achieved; meanwhile, the dynamic bending stress of the tooth root is calculated based on the dynamic normal load, and the bending fatigue safety coefficient is checked.

A plurality of collapsible protrusions extending from a base including a first end, a second end, a first surface, and an outer surface. The second end is opposite the first end. The first surface is distal from the base. The outer surface is between the first end and the second end. The outer surface has a variable coefficient of friction. The variable coefficient of friction increases in a direction towards the base. The second end has a coefficient of friction greater than the coefficient of friction at the first end.

The invention belongs to the technical field of petroleum and natural gas industry, and discloses a gas seal thread sealing performance evaluation method and a thread optimization method and system.The evaluation method comprises the steps that structural parameters of a target connector are determined; determining the sealing contact effective length of the target joint and the initial interference magnitude of the sealing surface; obtaining a make-up torque model of the target joint; performing make-up torque parameter sensitivity analysis, and evaluating thread parameters by analyzing the influence of the magnitude of interference and the thread friction coefficient on the proportion of the total make-up torque and the shoulder surface acting torque; and performing finite element analysis on the target joint air-tight seal buckle, and evaluating the thread sealing performance under the corresponding working condition according to a finite element analysis result. Advanced theories of material mechanics, pipe column mechanics, finite element analysis and the like are integrated, various performance indexes of thread strength, thread sealing performance and the like of the threaded connector under different loading conditions can be comprehensively evaluated, and different parameter optimized thread structure stress values can be rapidly obtained.

The invention relates to the technical field of polishing pressure control, in particular to a polishing machine polishing head pressure control method and system.The polishing machine polishing head pressure control method comprises the steps that the contact area is calculated through a curvature self-adaption algorithm, and a basic pressure sequence is generated; estimating a real-time friction coefficient by monitoring motor current, stripping friction interference in combination with a geometric coupling factor, and reversely correcting a pressure sequence; and multi-step residual prediction control is introduced, an autoregression model is constructed to predict future pressure deviation, and a suppression sequence is generated to control feeding of the grinding head. Dynamic mapping between the contact area and the target pressure is established through the curvature self-adaption algorithm, and it is ensured that the pressure intensity of the complex curved surface is uniform; a non-linear friction interference algorithm is used for eliminating coupling errors, and misjudgment of the controller is prevented; residual prediction control is introduced to overcome system lag, advanced suppression of pressure fluctuation is achieved, and grinding robustness and surface quality are remarkably improved.

Systems, assemblies, apparatuses, and methods herein may provide an enhanced fluid seal between two machine components. A seal may include a seal body having a seal body surface and a seal cross-section at least partially defined by the seal body surface. The seal body may include a first portion including a first material, the first material having a first coefficient of friction, and a second portion including a second material, the second material having a second coefficient of friction less than the first coefficient of friction, thereby to reduce friction at a seal interface between the second portion of the seal and one of the machine components, so as to reduce heat generation and extend a service life of the seal as the machine component moves relative to another machine component during operation of the machine.

A refrigerating machine oil containing alkylbenzene and a hydrocarbon oil other than alkylbenzene having a refractive index of 1.445 or less at 20 DEG C.

The invention discloses a device and method for improving netlike grains on the roller surface of a cathode roller, and relates to the technical field of metal surface treatment, and the device comprises a roller arranged on the surface of a cathode roller main body; the gears are coaxially arranged on two sides of the roller and synchronously rotate along with the roller; the clamping insertion block is movably arranged above the gear; the special-shaped push block is fixed at the bottom end of the second oil cylinder; and the circular balls are arranged in the protective shell at equal intervals and roll and displace under the thrust of the special-shaped push block. The characteristic that the friction force can be changed before and after the cathode roller body is polished is ingeniously utilized, the idler wheels interacting through friction transmission are arranged on the surface of the cathode roller body in a contact mode, and the transmission effect of the idler wheels is dominated by the friction coefficient of the contact face; the rolling wheel does not rotate any more and drives the milligram energy actuator to be away from the cathode roller body, the cathode roller body is not polished any more, excessive polishing is prevented, and the risk that net-shaped lines are generated on the surface is reduced.

The invention discloses a micro-nano pressure rotating motor, which comprises an output middle shaft, an elastic friction plate, a linear driver, a pre-tightening supporting seat and a stator, the output middle shaft is arranged in the stator and extends out of the stator, the output middle shaft rotates relative to the stator, and a pressure-torsion flexible hinge is arranged in the middle of the output middle shaft; the elastic friction plate is arranged at the lower part of the output middle shaft and is in frictional contact with the lower end of the output middle shaft; the contact part of the elastic friction plate and the output middle shaft can move along the axial direction; the periphery of the elastic friction plate is fixedly connected with the stator and cannot rotate; the linear driver drives the bottom of the elastic friction plate; the pre-tightening supporting seat is arranged on the stator and is used for supporting the linear driver and enabling the linear driver, the elastic friction plate and the output middle shaft to be mutually compressed; the friction coefficient between the output center shaft and the stator is smaller than that between the output center shaft and the elastic friction plate.

The utility model belongs to the technical field of glasses supports, and discloses a limiting structure of a glasses support, which comprises a glasses frame connecting piece and glasses legs, and is characterized in that the glasses legs and the glasses frame connecting piece are connected through a hinging piece, the hinging piece comprises a clamping piece and a rotating shaft, the glasses frame connecting piece and the glasses legs are both connected with the rotating shaft, and the clamping piece is clamped on the rotating shaft; wherein gaskets are arranged between the glasses legs and the rotating shaft, and the gaskets are configured to be used for reducing friction; through the arrangement of the gaskets, the joints are smoother in the moving process, the friction coefficient between the glasses legs and the rotating shafts can be remarkably reduced, the clamping stagnation phenomenon at the joints of the glasses frame and the glasses legs is reduced, and meanwhile abrasion caused by repeated unfolding and folding is reduced. Therefore, the service lives of the spectacle frame connecting piece and the spectacle legs are prolonged, and the material damage caused by friction is reduced.

The application relates to the technical field of swing plate shearing machines, and discloses a blade gap adjusting mechanism of a hydraulic swing plate shearing machine, which comprises an adjusting seat, an adjusting mechanism arranged on the adjusting seat, a sliding seat arranged in the adjusting seat, a shearing mechanism arranged on the sliding seat, an oil storage tank, a piston cylinder and a function box fixedly installed at the top of the adjusting seat, wherein the piston cylinder is located at the right side of the oil storage tank, and the function box is located at the right side of the piston cylinder; a piston mechanism is arranged in the piston cylinder, and a push plate is slidably installed in the function box. The application has the following advantages and effects: the piston mechanism and the lubricating mechanism are arranged, the lubricating oil can be uniformly sprayed on key transmission parts such as the screw thread surface and the bevel gear meshing position through the oil injection head, a continuous oil film can be formed, the friction coefficient is reduced, the wear of parts is reduced, the smooth transmission is ensured, the hysteresis and unevenness of manual lubrication are avoided, and the like.

To provide a simulator capable of appropriately reproducing acceleration acting on a user.SOLUTION: The control unit of the simulator receives the squaring angle detected by the first detecting unit or the squaring angle calculated from the angular velocity detected by the first detecting unit and the angle of attack detected by the second detecting unit, calculating an inertial force generated in the support plate in the turn action from an equation of motion related to a gravity of the user acting on the support plate, a frictional force between the support plate and the reference surface, and an air resistance acting on the user in the turn action, using a friction coefficient between the support plate and the reference surface in the turn action as a sum of a first friction coefficient between the support plate and the reference surface in a carving turn action in which the turn action is performed in a state of being inclined in the roll direction and a second friction coefficient between the support plate and the reference surface in a squatting turn action in which the turn action is performed so as to rotate in the yaw direction; The turning radius of the support plate in the turn operation is calculated, and the driving part is controlled based on the calculation result.SELECTED DRAWING: Figure 1

A flow separation suppression device is provided on an outer surface of a moving body and includes a flow separation suppressing portion. The flow separation suppressing portion includes two ridges and a recessed groove. The ridges are spaced apart from each other in an intersecting direction that intersects a longitudinal direction of the moving body. The longitudinal direction is a direction of travel of the moving body. The recessed groove is provided at a position between the ridges. Each of the ridges has a width decreasing toward a protruding end. The recessed groove has a width decreasing toward a bottom. A distance between the ridges is determined in accordance with a wall friction coefficient between the outer surface and a fluid flowing along the outer surface. The wall friction coefficient is a wall friction coefficient in the vicinity of the flow separation suppressing portion on the outer surface.

The invention discloses a variable-stiffness friction slippage anti-swing three-dimensional shock isolation device and a shock absorption method thereof, and belongs to the technical field of building shock isolation and shock absorption. According to the technical scheme, the vibration damper comprises a top plate, a horizontal rubber support, a center mass block, a spring support, a limiting plate, a friction plate, a vertical rubber support and a bottom plate. The multi-stage self-adaptive rigidity mechanism has the beneficial effects that the friction material is arranged between the limiting plate and the friction plate, and the friction sliding position and the motion state can be controllably adjusted by adjusting the pre-tightening force of the bolt, the friction coefficient and the rigidity of the vertical rubber support, so that the multi-stage self-adaptive rigidity mechanism is formed; and the shock insulation and self-resetting performance of the structure under the action of horizontal and vertical earthquakes is obviously improved. The device has good three-dimensional shock insulation and swing resistance, and is simple in structure and convenient to install and maintain. The dynamic response of the upper structure applying the device under the earthquake action can be effectively inhibited, so that the structural safety and the use comfort are guaranteed.

The invention discloses a thread friction coefficient measuring device and a thread friction coefficient measuring method. The thread friction coefficient measuring device comprises a driving device; the supporting piece can move in the direction close to or away from the driving device and can be positioned at a first position and a second position; the bolt is connected with the driving device, and the periphery of the bolt is sleeved with a gasket; the internal thread sample piece is provided with a threaded hole and is arranged on the supporting piece; when the supporting piece is positioned at the first position, the bolt is partially screwed with the threaded hole, and the gasket is not subjected to extrusion force; when the supporting piece is positioned at the second position, the bolt and the threaded hole are completely screwed, and the gasket is in an extruded state; the pressure piece is connected with the internal thread sample piece, and the pressure piece and the internal thread sample piece are arranged on the two sides of the supporting piece respectively; the pressure sensor is clamped between the pressure piece and the supporting piece; and the torque sensor is used for detecting the output torque of the driving device. The total friction coefficient of the threaded hole, the friction coefficient of the thread pair and the friction coefficient of the bearing surface are obtained through one-time clamping test, and the measurement efficiency and accuracy are improved.

Disclosed is a sliding component comprising: a fixing member; a sliding member disposed facing and spaced apart from the fixing member; and a liquid disposed between the fixing member and the sliding member, wherein the sliding member has a first substrate and a first coating layer directly or indirectly laminated on a surface of the first substrate facing the fixing member, the first coating layer contains engineering plastic and a solid lubricant, and the ratio of the friction coefficient at a bearing characteristic number of 8×10-9 to the friction coefficient at a bearing characteristic number of 8×10-10 on a surface of the sliding member facing the fixing member is 75% or less.

The present invention discloses a method for obtaining a catalyst coated membrane (CCM), including obtaining a friction coefficient of a material to be tested, identifying whether the friction coefficient is within a range from 0.1 to 15 or not, and if so, using the material to be tested in a CCM manufacturing process to obtain the CCM, wherein the flatness of the CCM and the friction coefficient of the material to be tested are positively correlated.

The present invention provides a fixing device capable of suppressing the displacement of a sliding member that comes into contact with a rotating fixing belt at the fixing nip section. [Solution] The fixing device 8 comprises a fixing belt 81, a sliding member 85, a nip forming member 84, and a pressure roller 82. The sliding member 85 is sheet-shaped and is positioned adjacent to the radially inner side of the fixing belt 81, with the inner circumferential surface of the rotating fixing belt 81 sliding into contact with it. The nip forming member 84 is positioned radially inner of the fixing belt 81, with the sliding member 85 sandwiched between it and the inner circumferential surface of the fixing belt 81. The static friction coefficient between the sliding member 85 and the nip forming member 84 is 0.3 or more.

The invention belongs to the technical field of optical communication cables, and particularly relates to a low-friction air-blowing micro cable based on ionic liquid. According to the invention, a traditional solid particle lubrication system is abandoned, the ionic liquid is introduced into an optical cable sheath material as a core lubricant, and because the ionic liquid forms a uniform lubricating film with molecular-level thickness on the surface of the sheath and cooperates with a synergistic lubricant polytetrafluoroethylene micro powder, a synergistic effect of soft liquid phase lubrication and hard rolling lubrication is formed. And the friction coefficient is obviously lower than that of a system based on MoS2. Tests show that the dynamic friction coefficient of the sheath relative to the HDPE micropipe can be stably reduced to below 0.08 and even reach the level of 0.03-0.05, and the dynamic friction coefficient far exceeds the performance limit (lt: 0.1) of the prior art.

The application is suitable for the technical field of machine tool combination assembly, and provides a micro contact joint surface static friction coefficient calculation method, which comprises the following steps: obtaining joint surface characteristic parameters; based on fractal theory and elastic theory, constructing base additional deformation and micro convex body normal deformation equation, through micro stress analysis, establishing single micro convex body deformation geometric parameters; considering three deformation stages of micro convex body, obtaining joint surface contact area and contact load; using modified island distribution function to integrate joint surface real contact area and contact load in different deformation stages, obtaining joint surface real contact area and contact load; considering the influence of static friction coefficient on contact surface characteristics, establishing joint surface static friction coefficient model. The application establishes surface static friction coefficient model from the micro contact angle, and simultaneously considers the interaction of micro convex body and base and three stages of material elastic, elastic-plastic and complete plastic deformation.

The tension control system of a roll-to-roll facility related to the present embodiment may comprise: a load cell which comprises an unwinder provided to unwind a substrate, a rewinder provided to wind the substrate, and transfer rolls arranged between the unwinder and the rewinder to guide travelling of the substrate, and is provided to measure a vertical load of the travelling substrate; a friction coefficient measuring unit provided to measure a friction coefficient between the travelling substrate and the transfer rolls; a dancer roll which guides the travelling of the substrate and is provided to be movable in a direction perpendicular to the width direction of the substrate; and a tension controller provided to receive a measured value input from the load cell and a measured value input from the friction coefficient measuring unit to control operation of the dancer roll so as to control tension of the travelling substrate.

The utility model discloses a device for testing the friction coefficient of air bag cloth. The device comprises a test board, a movable arm, a friction block and a clamping block, supporting rods are vertically arranged at the two ends of one side of the top of the testing table and penetrate through guide holes in the two sides of the clamping block, the clamping block is installed on one side of the top of the testing table in a liftable mode through sliding fit between the guide holes and the supporting rods, and a first sliding groove extending in the horizontal direction is formed in the rear side of the testing table. The bottom end of the movable arm is movably installed in the first sliding groove through a sliding connection structure, a second sliding groove extending in the vertical direction is formed in the upper portion of the front wall of the movable arm, a sliding block is slidably installed in the second sliding groove, and a lifting arm is fixedly installed at the front end of the sliding block. According to the utility model, by controlling the motion trails of the movable arm, the lifting arm and the friction block, seamless switching between precise positioning and bidirectional friction testing of a test part can be realized, operation errors and efficiency loss caused by manual adjustment are avoided, and the test efficiency and the data reliability are remarkably improved.

According to the method for testing the effective prestress of the existing concrete structure considering the reverse friction influence, a plurality of prestressed tendons are pre-buried in concrete to form an in-service prestressed concrete member, and one prestressed tendon at the end part of the concrete is stretched by using a supplementary tensioning tool; in the stretching process, the obtained stretching stress of the prestressed tendon, the corresponding stretching length measured from the failure of friction constraint between an anchorage device and a wedge-shaped clamping piece of the prestressed tendon and the effective stress of the in-service prestressed concrete member are recorded for at least five times, and the obtained stretching stress and the corresponding stretching length are the secondary reverse friction force influence stress; selecting the friction coefficient of local deviation of the length per meter in the pore channel and the friction coefficient between the prestressed tendon and the wall of the pore channel from the anti-friction influence length corresponding to the anti-friction influence stress; finding out an optimal one; and calculating the effective stress of the out-service prestressed concrete member by using any recorded tensile length.

The utility model belongs to the technical field of bearing installation, and particularly discloses a differential shell anti-skid structure for preventing a ball bearing from running, which comprises a transmission shaft, a bearing, a differential shell and a rubber ring, the outer ring of the bearing is installed in a bearing installation hole of the differential shell, and the inner ring of the bearing is sleeved on the shaft neck of the transmission shaft; an outer wall groove is formed in a shaft neck of the transmission shaft, an end face groove is formed in a shaft shoulder of the transmission shaft, and rubber rings are arranged in the outer wall groove and the end face groove. The outer wall groove and the end face groove are the same in structure. The anti-skid structure is an improvement on an existing structure, the research and development cost is reduced, and the use effect is good; according to the anti-skidding structure, the shaft groove and the rubber ring are arranged, so that the friction coefficient between the differential shell and the bearing inner ring is increased, and the bearing inner ring is not prone to skidding and running.

A gripper which has a friction estimation module configured to estimate static and / or dynamic friction forces acting on gripping jaws is provided. The static friction force is calculated on the basis of constraining reactions whereto the gripping jaws are subjected, the constraining reactions being calculated at least as a function of an actuation force exerted on the gripping jaws, a coefficient of friction of gripper materials and / or lubricant used being known. The dynamic friction force is calculated on the basis of speed of the gripping jaws, width of sliding surfaces and distance between the sliding surfaces of the gripping jaws, the viscosity of the lubricant used being known.

The present invention pertains to glass having a first main surface and a second main surface opposite from the first main surface. At least a portion of the first main surface has a structure with recesses and protrusions. A visibility indicator value T of the outermost surface in a region on the first main surface side in which the structure with recesses and protrusions is provided is 0.85 or higher, and the average dynamic friction coefficient COF thereof is 0.70 or higher. The present invention also pertains to a method for manufacturing the glass, the method comprising: preparing glass having a first main surface and a second main surface opposite from the first main surface; and forming a structure with recesses and protrusions on at least a portion of the first main surface.

The utility model discloses a sliding structure capable of running smoothly, which belongs to the technical field of automobile accessories and comprises a sliding groove, a sliding channel arranged along the length direction of the sliding groove is arranged in the sliding groove, a sliding seat and a screw rod for driving the sliding seat to translate along the sliding channel are arranged in the sliding channel, the top surface of the sliding seat is connected with a cantilever, and the cantilever is connected with the sliding groove. A guide rail is arranged on the inner wall of the sliding groove, a groove is formed in the sliding base, and the guide rail extends into the groove. According to the sliding structure which runs smoothly, the original large cylindrical sliding contact surface is changed into a small-area contact form that the sliding chute is matched with the sliding seat, so that the friction coefficient is greatly reduced.

The invention is suitable for the technical field of data processing for judging the abrasion loss of a die, and particularly relates to a wire-drawing die abrasion loss online judgment method and a wire drawing machine. The method comprises the steps that the current drawing force, the current die temperature, the current drawing speed and the area reduction rate are obtained; according to the current drawing speed and the area reduction rate, the ideal drawing force and the ideal mold temperature of the current period are calculated through digital twin bodies in the wire drawing process; determining a current equivalent friction coefficient based on the current drawing force, the current mold temperature, the ideal drawing force and the ideal mold temperature; based on the current equivalent friction coefficient, the current abrasion loss is determined, and the current hole diameter of the wire drawing die is calculated according to the current abrasion loss; and based on the current equivalent friction coefficient, predicting the service life of the wire-drawing die to obtain the residual service life of the wire-drawing die. According to the method, the abnormal wear state of the mold is sensed in advance through the change of the equivalent friction coefficient, and early recognition and prediction and early warning of wear are realized.

The application provides a method and device for determining a comprehensive friction coefficient of a friction torque, and a method for early warning, wherein the method for determining comprises the following steps: acquiring a basic data set corresponding to each position in the well depth direction of a current well; segmenting the current well along the well depth direction based on the basic data set corresponding to each position, and determining a basic data set corresponding to each segment in the current well; determining a hyperparameter corresponding to each segment according to the basic data set corresponding to each segment in the current well; setting a multi-parameter nonlinear inversion algorithm corresponding to each segment according to the hyperparameter corresponding to each segment; and calculating a predicted value of the comprehensive friction coefficient corresponding to each segment by using the multi-parameter nonlinear inversion algorithm corresponding to each segment according to the basic data set corresponding to each segment in the current well. The application can improve the calculation accuracy of the comprehensive friction coefficient of the friction torque, and the friction torque can be further calculated by using the predicted value of the comprehensive friction coefficient, thereby improving the calculation accuracy of the friction torque.

The present application relates to the technical field of pipe pile pipe joint hoisting, and discloses a special lifting appliance for large pipe pile pipe joint hoisting and a loading and unloading process, the special lifting appliance for large pipe pile pipe joint hoisting comprises a main lifting arm, a lifting lug, a counterweight and a buffer pad, is combined into a C-shaped lifting arm, realizes transfer hoisting through the mode of laterally sleeving into the pipe pile, the lifting lug is fixedly installed at the top of the main lifting arm, the counterweight is installed at the upper end and the bottom end of the main lifting arm, and the corresponding weight of the pipe pile sleeved on the upper end and the bottom end of the main lifting arm is matched, the buffer pad is fixedly installed at the top of one end of the main lifting arm away from the counterweight, and the high friction coefficient of the buffer pad prevents the pipe pile from slipping during hoisting; the support component corresponding to the size of the pipe pile is matched and ejected at the sleeving connection area of the main lifting arm and the pipe pile, the two sides of the inner wall of the pipe pile are supported and fixed, the posture of the pipe pile is automatically corrected, the axis of the pipe pile is always kept vertical during hoisting, and the lifting appliance is prevented from being unbalanced due to eccentricity.