1359 results about "Frictional coefficient" patented technology

The invention provides a zipper simulation method and related equipment, a zipper comprises a tooth chain and a puller, the method comprises the following steps: obtaining dynamic performance parameters of the puller pulling the tooth chain, and generating a simulation pulling process corresponding to the pulling process according to the dynamic performance parameters; obtaining simulation penetration depths and initial penalty coefficients between simulation structure contact surfaces of the simulation zipper corresponding to the simulation pulling process and the pulling process; updating the initial penalty coefficient according to the depth change of the simulation penetration depth; according to the simulation penetration depth and the updated initial penalty coefficient, obtaining the normal force of the contact surface of each simulated structure; according to the friction coefficient and the relative sliding speed, obtaining a dynamic friction coefficient between the contact surfaces of the simulated structures; according to the normal force and the dynamic friction coefficient, the zipper light sliding force in the simulation pulling process is obtained, and the detection accuracy and calculation efficiency of the normal force (the component of the contact force) of the microscopic contact behavior between the puller and the toothed chain and the zipper light sliding force can be improved.

The invention relates to a negative-wear super-wear-resistant current-carrying friction pair material which is a conductive lubricating film which is constructed in situ and stably exists under a current-carrying friction condition, and the current-carrying friction pair material is composed of Ga-based liquid metal, a Mo coating and an Al alloy bolt. Through cooperation of friction pair materials, a friction interface reaction is adjusted to generate a conductive lubricating film, and excellent lubricating and wear-resisting properties are achieved; in a large voltage and current range, the average friction coefficient is always maintained to be 0.25 or below, the existence of the lubricating film enables the surface to present negative wear, and the average negative wear rate is 1.28 * 10 <-6 > mm < 3 > / Nm or above. The obtained material is suitable for application in the field of electric contact industry and provides lubrication and wear protection for the surfaces of mechanical parts.

The invention provides a drawing simulation method for an anisotropic material, and belongs to the technical field of drawing simulation, and the drawing simulation method comprises the following steps: firstly, measuring a microstructure structure of the anisotropic material, and constructing a constitutive model of a dynamic self-adaptive material; importing the constitutive model into finite element analysis software to form a finite element model of multi-physical field interaction behaviors; importing the finite element model into an adaptive mesh generation algorithm to form a finite element simulation result; performing real-time analysis on a finite element simulation result by using a deep learning algorithm, and outputting an analysis report in a visual chart form; and the die fillet radius, the drawing gap, the blank holder force, the drawing speed, the friction coefficient and the electromagnetic regulation and control parameters are synergistically and dynamically optimized, and the lug rate of the cup-shaped part is obtained according to drawing simulation. According to the deep drawing simulation method for the anisotropic material, the convex lug rate of the cup-shaped part is obtained by constructing the constitutive model and forming the finite element result of the finite element model, so that the convex lug problem of deep drawing of the cup-shaped part is predicted.

The invention relates to the technical field of parameter simulation, in particular to a parameterized simulation model design method based on a standard part structure. The method comprises the following steps: collecting bolt connection data of standard components in the wind generating set; blade surface vibration feature information is extracted according to the standard component bolt connection data; acquiring stress concentration distribution data at the joint based on the blade surface vibration characteristic information; calculating a local deformation accumulated value of the standard part according to the stress concentration distribution data at the joint; measuring the friction coefficient variation trend of the contact surface based on the local deformation accumulated value of the standard component; deducing pre-tightening force attenuation characteristics according to the change trend of the friction coefficient of the contact surface; and constructing a standard part fatigue damage prediction model based on the pre-tightening force attenuation characteristics. According to the method, the vibration characteristics of the blade surface are collected, the stress concentration distribution at the bolt connection position is indirectly extracted, and the bottleneck that the internal connection state is difficult to directly sense is broken through.

Systems and methods for clamping force estimation are provided. In one example, operations include generating a displacement-torque curve based on displacement data and motor torque data of an electric motor of the EMB system for a braking episode having a switchover time. The operations also include determining a high torque value and a low torque value at the switchover time from the displacement-torque curve. The operations further include calculating a friction coefficient based on the high torque value and the low torque value. The operations yet further include determining a non-linear coefficient from the displacement-torque curve. The operations include estimating a clamping force for a constant speed based on the friction coefficient and the non-linear coefficient.

The invention relates to the technical field of powder machines, in particular to an intelligent control method and system for a powder forming machine. The method comprises the steps that powder material parameters and mold parameters are obtained, the powder material parameters comprise particle size distribution, yield strength and a friction coefficient, and the mold parameters comprise mold geometric parameters; based on a discrete element method, particle dynamic analysis is conducted on the powder material parameters, particle mechanical motion characteristic data are generated, and the particle mechanical motion characteristic data comprise particle position data, speed data, contact force data and force chain distribution data constructed by the contact force data; based on a finite element method, structural mechanics analysis is conducted on the mold parameters, mold macromechanics response data are generated, and the mold macromechanics response data comprise stress distribution data, strain distribution data and displacement distribution data; and according to the particle mechanical motion characteristic data and the mold macromechanical response data, generating a powder pressing path control instruction of the mold.

The support comprises an upper seat plate, a spherical crown lining plate, a middle steel lining plate and a lower seat plate, the upper seat plate is fixedly installed at the bottom of a beam bottom, the spherical crown lining plate is arranged between the upper seat plate and the middle steel lining plate, the middle steel lining plate is arranged between the spherical crown lining plate and the lower seat plate, and the spherical crown lining plate is fixedly installed on the lower seat plate. The lower seat plate is fixedly mounted at the top of a bridge pier, the bottom surface of the upper seat plate is fixedly connected with a first limiting ring through a first anti-shear pin, the first limiting ring abuts against the middle steel lining plate, the top surface of the lower seat plate is fixedly connected with a second limiting ring through a second anti-shear pin, and the second limiting ring abuts against the middle steel lining plate. In a normal use state, the slip surface adopts a large curvature radius and a small friction coefficient to provide smaller damping, reduce the acting force of the support on a bridge and reduce the lifting of a beam end, and in an earthquake state, the slip surface adopts a small curvature radius and a large friction coefficient to provide larger damping, so that the shock absorption and isolation effect of the support is improved; and displacement of the bridge under the earthquake condition is controlled.

The invention relates to the technical field of engineering construction, and particularly discloses a pavement flatness measuring device for engineering construction, which comprises an eight-wheel instrument for measuring the flatness of a pavement; the detection mechanism is installed in the eight-wheel instrument support, and the detection mechanism detects the friction coefficient of the road surface before the device runs; the road surface friction coefficient is detected in advance through the adjusting mechanism, the adjusting mechanism dynamically adjusts the position of a pressure sensor and the ground clearance of a detection wheel according to the friction coefficient, and a fixed motor is started to drive a rotating ring to rotate through a rotating roller and a synchronous belt to drive a second lead screw to rotate; the movement of the second moving member can drive the eight-wheel instrument supporting seat to move up and down, thereby adjusting the ground clearance of the detection wheel, effectively compensating the data deviation caused by the wear of the detection wheel, and improving the accuracy and stability of the measurement result.

The invention discloses a well completion pipe string tripping-in capacity analysis method, system and equipment, and belongs to the technical field of oil and gas engineering.The method includes the steps that a friction torque mechanical theoretical model is adopted, and a full-shaft equivalent friction coefficient is obtained through fitting of measured data in the simulated drifting stage; according to the equivalent friction coefficient obtained through fitting, the deformation state of the open hole segmented well completion pipe string is calculated and analyzed, and therefore it is ensured that the well completion pipe string can be safely tripped in; meanwhile, different encountering resistances are arranged in a distributed mode, the deformation state of the pipe column in the tripping-in process of the well completion pipe column is calculated and analyzed, the critical encountering resistance is determined according to the deformation state of the pipe column, a more objective and reliable encountering resistance value is provided for control over the tripping-in process of the pipe column, the tripping-in safety of the pipe column is improved, and meanwhile the construction efficiency is improved.

The invention provides a method for analyzing the high-temperature friction performance of a copper crystallizer coating, and relates to the technical field of steel continuous casting production. The method comprises the following steps: firstly, carrying out a friction-wear experiment on a crystallizer copper plate coating through a friction-wear platform reciprocating in a sine mode, measuring the friction coefficient of the crystallizer copper plate coating under a high-temperature condition, and obtaining the wear depth after a certain period of time; then establishing a crystallizer plating layer friction wear finite element model in finite element analysis ABAQUS software, introducing a friction coefficient measured by an experiment to carry out friction wear simulation calculation, comparing and analyzing results of the friction wear experiment and the simulation calculation, and determining the friction wear behavior of the crystallizer copper plate under the complex working condition; and the analysis on the high-temperature service performance of the crystallizer copper plate coating is realized. According to the method, the friction performance of the crystallizer copper plate coating under the high-temperature condition can be accurately analyzed, and a basis is provided for optimizing the manufacturing process of the crystallizer copper plate coating and improving the coating performance.

The invention discloses a forking operation track generation method and device for a forklift, and the method comprises the steps: determining the pose of a target tray when the distance between the forklift and the target tray reaches a first distance; according to the target tray pose, the current fork tooth pose and the forking environment illumination intensity, the first pose deviation between the target tray and fork teeth is determined, and a first forklift linear speed and angular speed instruction is obtained through calculation; in the process that the forklift travels to the second distance, the ground friction coefficient and the vibration compensation amount are determined according to the friction-vibration joint estimation model and the first forklift linear speed and the first forklift angular speed; when the second distance is reached, determining a second pose deviation between the target tray and the prongs; and simulating the obtained parameters to obtain a second linear velocity and angular velocity instruction so as to complete the forking operation. Through rough adjustment and fine adjustment of the two distances, high-precision track planning of the forklift is achieved, and through calculation of the ground friction coefficient and the vibration compensation amount, the curve insertion precision of the tray is further improved.

The invention provides a wafer polishing method, a polishing device and processing equipment, the wafer polishing method is used for removing a target layer comprising a first layer and a second layer with similar friction coefficients, a primary polishing process comprises a first polishing stage and a second polishing stage, and the method comprises the following steps: determining first time; determining the material removal amount and the material removal rate of the wafer in the second polishing stage; calculating second time; adjusting the first time according to the second time to obtain third time; and polishing the current wafer, executing a first polishing stage according to a third time, and executing a second polishing stage according to a second time, so that the second layer reaches the target thickness. According to the polishing method, the chemical mechanical polishing efficiency and polishing precision of the specific wafer can be improved.

The invention relates to a sealing device and a bearing. The invention provides a sealing device, which is used for performing dynamic sealing between a first rotating part and a second rotating part which can relatively rotate around a rotating axis, and comprises a framework, a sealing part and a sealing part, and is characterized in that the framework is used for being fixed on the first rotating part; the sealing ring is fixed to the framework and comprises an axial sealing lip and a radial sealing lip; the antifriction patch is of an integral annular structure and comprises an axial patch part connected to the axial sealing lip and a radial patch part connected to the radial sealing lip, when the sealing device is installed between the first rotating component and the second rotating component, the axial patch part is used for making sealing contact with the second rotating component in the axial direction, and the radial patch part is used for making sealing contact with the first rotating component in the radial direction. The radial patch part is used for being in sealing contact with the second rotating component in the radial direction, and the friction coefficient of the friction reducing patch is smaller than that of the sealing ring.

The invention discloses a method for evaluating the performance of a friction pendulum type seismic mitigation and isolation support in a service state. The method comprises the following steps: S1, carrying out horizontal sliding displacement and vertical force detection on the friction pendulum type seismic mitigation and isolation support in service; s2, according to the detected data, the sliding interface friction coefficient mu of the service friction pendulum type seismic mitigation and isolation support is calculated; s3, according to the obtained sliding interface friction coefficient mu of the in-service friction pendulum type seismic mitigation and isolation support, anti-seismic performance indexes of the friction pendulum type seismic mitigation and isolation support are calculated, and the anti-seismic performance indexes comprise the horizontal rigidity and the effective damping ratio coefficient; and S4, according to the influence of the sliding interface state change and the horizontal rigidity change on the seismic damage state of the bridge structure, the anti-seismic safety risk of the friction pendulum type seismic mitigation and isolation support in the sliding interface state is graded. By means of the method, the sliding interface state and the specific friction characteristic of the friction pendulum type seismic mitigation and isolation support in the service state can be obtained, and therefore the anti-seismic performance of the friction pendulum type seismic mitigation and isolation support can be evaluated.

The invention discloses a self-adaptive parallel clamp and method suitable for a bush-disc test, and belongs to the technical field of mechanical engineering, the self-adaptive parallel clamp comprises a supporting mechanism, a parallelism adjusting mechanism is arranged in the supporting mechanism, the lower end of the supporting mechanism is connected with a clamping rod, the lower end of the clamping rod is provided with a sample clamping mechanism, and the sample clamping mechanism is provided with a clamping mechanism. And a movement mechanism is arranged at the lower end of the sample clamping mechanism. By adopting the self-adaptive parallel clamp suitable for the lining-disc test, the problem of parallelism error between the lining and the disc is solved, so that the horizontal load error and the friction force and friction coefficient measurement error caused by the error are reduced, and a more accurate surface-surface friction wear disc test is realized.

The invention relates to the field of bevel gear pair friction-flash temperature characteristic calculation, and particularly discloses a bevel gear pair friction-flash temperature characteristic calculation method under real machining surface conditions. Comprising the following steps: calculating oil film shear stress, shear modulus and tooth surface micro-bulge contact shear stress in a helical gear meshing process by adopting a non-Newtonian fluid model and a micro-bulge contact model; summing the shearing stress of the oil film and the shearing stress of the micro-bulge, and performing integration to solve the friction force of the contact domain in the meshing process of the bevel gear and the friction coefficient in the single-tooth meshing period of the bevel gear; coupling oil film shear stress, micro-convex body contact shear stress and relative slippage of two interfaces, and solving heat generated by a tooth surface contact domain in the meshing process through a heat distribution model; substituting the obtained heat into a second kind of Volterra integral equation based on a fast moving heat source model, and calculating the interface flash temperature by adopting an iteration method; and the obtained interface flash temperature is reversely brought back to the non-Newtonian fluid model, and repeated iteration is carried out until convergence.

The invention discloses a method, device and equipment for inhibiting abnormal torsional vibration of a propulsion shafting and a storage medium, and relates to the technical field of ship propulsion systems.The method comprises the steps that the torsional vibration inherent frequency and the torsional vibration modal shape corresponding to the abnormal torsional vibration frequency of the propulsion shafting are matched; calculating the modal mass and the modal damping ratio of the abnormal torsional vibration of the matching order, and calculating the bearing reaction at the rear stern bearing and the front stern bearing; fitting friction coefficients among the rear stern bearing, the front stern bearing and the propulsion shafting; according to the reaction force, the friction coefficient and the matched torsional vibration modal shape, calculating a friction excitation torque under the torsional vibration modal shape of the corresponding order and a Taylor expansion coefficient corresponding to the friction excitation torque; and according to the matched inherent frequency of the torsional vibration, the modal mass, the modal damping ratio and the Taylor expansion coefficient, a suppression device used for generating electrical damping is arranged on the propulsion shafting so as to suppress the abnormal torsional vibration. According to the application, the abnormal torsional vibration can be accurately suppressed by accurately designing the structural parameters of the suppression device.

The invention discloses a water turbine guide vane shaft-top cover rub-impact coupling system vibration characteristic analysis method which comprises the following steps: S1, establishing a reduction dynamic model of a guide vane shaft-top cover rub-impact coupling system by adopting a finite element method in combination with a fixed interface modal synthesis method; s2, analyzing an influence rule of a modal truncation number, a friction coefficient and a water flow surface load on first three orders of prestress modal characteristics of the guide vane shaft-top cover rub-impact coupling system based on a reduction kinetic model; s3, analyzing an influence rule of a near load end contact state, a near-far load end contact state and a friction coefficient on vibration response and spectral characteristics of the guide vane shaft-top cover rub-impact coupling system when the reduction kinetic model is subjected to harmonic excitation; and S4, evaluating whether the mixed-flow water turbine operates stably and safely based on the steps. By analyzing the vibration characteristics of the guide vane shaft-top cover rub-impact coupling system of the mixed-flow water turbine, the structural health state and fault of the mixed-flow water turbine are monitored and diagnosed.

The utility model relates to a tensioning device for a building block type screw. The tensioning device comprises a stretching piece, a pressing piece, a telescopic piece and a driving piece. The stretching piece is used for being connected with a locking piece of the building block type screw. The pressing piece is used for being connected with a thread element of the building block type screw. One end of the telescopic piece is connected with the stretching piece, and the other end of the telescopic piece is connected with the pressing piece; the driving part is connected with the telescopic part and used for driving the telescopic part to do telescopic motion. Compared with the prior art, the tensioning piece and the pressing piece only transmit axial force to the shaft core and the thread element, so that the transmission efficiency of the tensioning force is high, and compared with a radial screwing mode of a traditional torque wrench, radial load is not borne between the shaft core and the thread element, and the torque wrench is simple in structure and convenient to use. The problem that the friction coefficient is increased due to torsional deformation of the thread element and the shaft core spline is solved.

The invention discloses a method and device for testing the sliding friction coefficient of rock under the true triaxial stress condition, and belongs to the field of rock parameter tests.The method comprises the steps that a rock cube to be tested is cut into two parts along the diagonal line, and rock powder of the same texture is smeared on the diagonal planes of the two cut rocks; the two parts of rocks coated with the rock powder are attached together along the diagonal planes of the rocks, and confining pressure is applied to the two opposite directions of the attached to-be-measured rock cube respectively till the confining pressure reaches the corresponding preset value; applying an axial pressure to the attached to-be-tested rock cube at a constant loading speed until the change of the axial pressure tends to zero; and calculating the sliding friction coefficient of the rock cube to be measured according to the final stable value of the axial pressure. The method can test and simulate the rock friction coefficient of a real stratum under the three-dimensional ground stress condition, and the accuracy of a test result is improved.

The invention provides a big data-based building construction safety assessment method, which comprises the following steps of: acquiring a tension distribution gradient, a local stress peak value, a tension fluctuation frequency and a pulley contact surface friction coefficient of a tower crane steel wire rope under a dynamic working condition, and determining a dynamic stress distribution characteristic of the steel wire rope; performing real-time data screening and peak value identification processing on the dynamic stress distribution characteristics to obtain a stress concentration coefficient distribution diagram of each measuring point, and determining a tension concentration area with the stress concentration coefficient higher than a preset threshold value; carrying out weighted adjustment on the non-uniform wear characteristics, calculating to obtain the surface wear depth, the wear particle size and the weight change of the contact surface temperature rise under different working conditions, and obtaining the real-time wear index weight distribution; and aiming at the real-time wear index weight distribution, combining the tension distribution gradient and the wear region area in the historical operation data, and analyzing and predicting the change trend of the surface roughness of the steel wire rope through wear trend fitting and load history to obtain a residual life prediction value.

The invention discloses a hot-dip tinning copper plate strip capable of reducing the surface friction coefficient of a copper strip and a manufacturing method of the hot-dip tinning copper plate strip, relates to the field of hot-dip tinning of copper plate strips, and aims to solve the problem that a product cannot have high hardness and good weldability and corrosion resistance at the same time in the prior art. The method comprises the following steps: plating a pure tin layer on the surface of a copper plate strip in a hot dipping manner, cooling to room temperature, annealing, and preserving heat, so that a Cu6Sn5 layer grows between the copper plate strip and the pure tin layer until the Cu6Sn5 layer grows to occupy more than half of the overall thickness of the plating layer, thereby improving the hardness of the tin plating layer of the copper plate strip. Therefore, the hot-dip tin-plated copper plate strip has high hardness and good weldability and corrosion resistance, and the pure tin layer on the outermost layer can enable the copper plate strip to have low friction coefficient and low insertion and extraction rate and can be used for multi-piece insertion.

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 utility model relates to a friction type quasi seismic isolation support, a bridge and a building body, comprising a spherical support used for forming a first plane friction pair with a building body cross beam, and further comprising an additional plane support used for being fixed on a building bottom pier and used for being supported between the spherical support and the building bottom pier; a second plane friction pair is formed between the additional plane support and the spherical support, and the friction coefficient of the second plane friction pair is larger than that of the first plane friction pair; the structure further comprises a plurality of fragile shear keys, the upper ends of the fragile shear keys are connected to the spherical support, and the fragile shear keys abut against the two opposite sides of the additional plane support in the midspan direction of the building cross beam in a limited mode. According to the utility model, the upper structure of the building body can be prevented from being easily lifted when the building body suffers from a rare earthquake, the building body is prevented from losing the shock resistance after the rare earthquake, and the controllability of the friction coefficient is stronger.

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.

The invention belongs to the field of analog simulation, and particularly relates to a runway dynamic friction coefficient real-time simulation method, system and equipment based on multi-source data. The problem that taxiing simulation is insufficient in authenticity is solved. The method comprises the following steps: acquiring runway surface temperature data, accumulated water depth and / or accumulated snow depth; judging a runway type based on the runway texture features, matching a basic friction coefficient according to the runway type, and dynamically correcting the basic friction coefficient in combination with the accumulated water depth and / or accumulated snow depth and runway surface temperature data to obtain a corrected friction coefficient; acquiring a tire vertical load, an initial sideslip angle and tire pressure data of the aircraft, calculating a tire lateral force, and calculating a final friction coefficient in combination with the updated sideslip angle, the corrected friction coefficient and the sideslip attenuation coefficient; and inputting the data into a ground taxiing model of the flight simulator to realize real-time simulation. Through the attenuation effect of the dynamic process on the friction coefficient, the simulation result better fits the real runway state.

The invention discloses a propulsion shafting abnormal torsional vibration diagnosis method, device and equipment and a storage medium, and relates to the technical field of ship propulsion systems.The method comprises the steps that torsional vibration inherent frequencies and torsional vibration modal shapes of a propulsion shafting under multiple target orders are obtained; the modal mass and the modal damping ratio of the propulsion shaft system under each target order are calculated, and the bearing reaction at the rear stern bearing and the front stern bearing is calculated; fitting friction coefficients among the rear stern bearing, the front stern bearing and the propulsion shafting; according to the reaction force, the friction coefficient and the torsional vibration modal shape under the target order, calculating a friction excitation torque under the torsional vibration modal shape of the corresponding order and a Taylor expansion coefficient corresponding to the friction excitation torque; and judging according to the inherent frequency of the torsional vibration, the modal quality, the modal damping ratio and the Taylor expansion coefficient under the target order, and checking whether the torsional vibration mode of the target order of the propulsion shafting has abnormal vibration or not. Whether friction torsion abnormal vibration is generated or not can be predicted according to the shafting design parameters.

The invention discloses a face gear dynamics analysis method considering hybrid thermal elastohydrodynamic lubrication and microtexture coupling, which comprises the following steps: step 1, based on a gear dynamics theory, constructing an eight-degree-of-freedom face gear-rotor system dynamics model; 2, establishing a finite element analysis model of the micro-texture face gear transmission pair, solving time-varying meshing stiffness and coupling the time-varying meshing stiffness to a system kinetic equation; 3, coupling a micro-texture item representing the film thickness equation with the film thickness equation of mixed thermal elastohydrodynamic lubrication; 4, coupling the mixing and thermal influence with the elastohydrodynamic lubrication basic equation, and establishing a mixed thermal elastohydrodynamic lubrication model; 5, carrying out iterative solution on the mixed thermal elastohydrodynamic lubrication and micro-texture coupling equation, outputting the tooth surface friction force and the friction coefficient of a solution domain, and inputting the tooth surface friction force and the friction coefficient as parameters into a system kinetic equation; and 6, solving the coupled system kinetic equation by using a Runge-Kutta numerical integration method to obtain the kinetic response of the face gear transmission system.

The invention relates to the technical field of welding monitoring, and discloses an online monitoring method for the welding quality of a joint of an ultrasonic welding metal sheet, which comprises the following steps: S1, detecting the friction coefficient of a welding interface of the metal sheet in real time through a friction coefficient detection unit; s3, dividing the real-time friction coefficient detected in the step S1 into three stages, namely a pre-welding stage, a welding process stage and a post-welding cooling stage according to the welding process, and S4, performing statistical analysis on the real-time friction coefficient of each stage in the step S3 by adopting an average value and an extreme value, and during calculation, at least obtaining the real-time friction coefficient of each stage during five times of welding. The method has the following advantages and effects that by dynamically monitoring the friction coefficient of the interface of the ultrasonic welding metal sheet in real time, detecting the quality of a welding joint in real time and optimizing welding process parameters in time, the percent of pass of products can be greatly increased, and the operability and accuracy of quality control are remarkably improved.

The invention discloses a simulation optimization method for a contact interface, which comprises the following steps of: initializing an input parameter which comprises a friction coefficient # imgabs0 # between collision body contact interfaces; motion state solving: according to the initialized # imgabs 1 #, solving the mutual friction force # imgabs 2 # between the collision bodies, the friction force impulse # imgabs 4 # caused by # imgabs 3 # and the tangential acceleration # imgabs 5 # caused by friction, and updating the positions and the speeds of the collision bodies by utilizing the friction force impulse # imgabs 6 # and the tangential acceleration # imgabs 7 #; friction coefficient optimization is conducted, specifically, the friction coefficient # imgabs8 # is optimized through a loss function, and the friction coefficient # imgabs9 # is obtained; performing motion state solving and friction coefficient optimization again by using the friction coefficient # imgabs10 # to obtain a friction coefficient # imgabs11 #, performing motion state solving and friction coefficient optimization again by using the friction coefficient # imgabs12 # to obtain a friction coefficient # imgabs13 #, and the like until the loss function is converged to a minimum value. According to the method, simulation precision and calculation efficiency can be considered at the same time.