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191 results about "Dynamical friction" patented technology
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In astrophysics, dynamical friction or Chandrasekhar friction, sometimes called gravitational drag, is loss of momentum and kinetic energy of moving bodies through gravitational interactions with surrounding matter in space. It was first discussed in detail by Subrahmanyan Chandrasekhar in 1943.
Friction compensation in a minimally invasive surgical apparatus
InactiveUS6899705B2High dexterityImprove precisionDiagnosticsSurgical manipulatorsLess invasive surgeryLow speed
Devices, systems, and methods for compensate for friction within powered automatic systems, particularly for telesurgery and other telepresence applications. Dynamic friction compensation may comprise applying a continuous load in the direction of movement of a joint, and static friction compensation may comprise applying alternating loads in positive and negative joint actuation directions whenever the joint velocity reading falls within a low velocity range.
Owner:INTUITIVE SURGICAL OPERATIONS INC
Friction compensation in a minimally invasive surgical apparatus
InactiveUS6974449B2High dexterityImprove precisionDiagnosticsSurgical manipulatorsLess invasive surgeryLow speed
Devices, systems, and methods for compensate for friction within powered automatic systems, particularly for telesurgery and other telepresence applications. Dynamic friction compensation may comprise applying a continuous load in the direction of movement of a joint, and static friction compensation may comprise applying alternating loads in positive and negative joint actuation directions whenever the joint velocity reading falls within a low velocity range.
Owner:INTUITIVE SURGICAL OPERATIONS INC
Friction liner-hoisting steel wire rope dynamic friction drive test device and friction liner-hoisting steel wire rope dynamic friction drive test method
ActiveCN104122198AImproved dynamic friction transmission characteristicsGood effectUsing mechanical meansMaterial analysisLongitudinal vibrationDynamical friction
The invention discloses a friction liner-hoisting steel wire rope dynamic friction drive test device and a friction liner-hoisting steel wire rope dynamic friction drive test method. The device comprises a base frame, a driving mechanism, a friction drive mechanism, a surrounding angle adjusting mechanism, a shock excitation mechanism, a steel wire rope and a condition monitoring mechanism, wherein the base frame comprises a stand column, a lower support platform and an upper support platform; the driving mechanism comprises a motor and a torque sensor; the friction drive mechanism comprises a friction wheel and a brake device; the surrounding angle adjusting mechanism comprises a C bracket and an adjusting wheel; the shock excitation mechanism comprises a transverse shock excitation mechanism and a longitudinal shock excitation mechanism; the condition monitoring mechanism comprises a steel wire rope tension monitoring device, a dynamic contact monitoring device, a steel wire rope vibration monitoring device and a micro-slippage monitoring device. After the device and the method are adopted, the dynamic friction drive characteristic between a friction liner and a hoisting steel wire rope can be simulated in a friction hoisting system when the hoisting steel wire rope is in a dynamic coupling vibration state, so that various changes in the friction drive process under the actions of transverse vibration, longitudinal vibration and transverse and longitudinal coupled vibration can be researched.
Owner:CHINA UNIV OF MINING & TECH
Friction hinge with viscous damping
InactiveUS20060272129A1Small sizeEasily and firmly attachedBuilding braking devicesWing fastenersViscous dampingFriction force
A hinge assembly rotationally connecting two components includes at least a shaft coupled to one of the components and a tubular member connected to the other component and a defining an annular space around said shaft. A viscous damping fluid is disposed in said space and provides a damping force resisting relative rotation between the two components. A second tubular member is also provided that is connected to the shaft and is arranged axially around the first tubular member. In this latter configuration, static and dynamic frictional forces are generated between the tubular members that resist rotation between the components as well.
Owner:TORQMASTER INC
Resistive actuator with dynamic variations of frictional forces
InactiveUS8154537B2Input/output for user-computer interactionControlling membersElectrical resistance and conductanceEngineering
A system for generating haptic effects on a rotary knob includes an electrical coil and a core. A first level of voltage is applied to the coil to enable a first surface interface having a first coefficient of friction and to generate a first haptic effect by varying the voltage. A second level of voltage is applied to the coil to enable a second surface interface having a second coefficient of friction that is greater than the first coefficient of friction and to generate a second haptic effect by varying the voltage.
Owner:IMMERSION CORPORATION
Servo system self-adaptive robust controller with dynamic frictional compensation
ActiveCN101846975AHigh precision descriptionAccurate estimateAdaptive controlEngineeringSelf adaptive
The invention discloses a servo system self-adaptive robust controller with dynamic frictional compensation, which is used for improving output tracking precision and fast response of a motor servo system and is particularly suitable for a precise motor servo system with requirements on high precision and fast response. The servo system self-adaptive robust controller comprises a parameter self-adaptive adjusting module, a dynamic frictional compensator and a robust control module. The online estimation of a frictional force value is realized by adopting a frictional model approximator constructed by a LuGre dynamic frictional model Lipschitz coefficient through self-adaptive adjustment of a parameter of the frictional approximator, and accordingly, the frictional compensation is carried out for overcoming the adverse effect of frictional force on the output tracking precision and the fast response of the servo system. The controller adopts a robust control law and ensures that the servo system has enough disturbance resistance. Because the controller can realize rapid and accurate frictional compensation and effectively inhibit the influence of external disturbance, the output tracking precision and the fast response of the servo system can be greatly improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Testing device and method for monitoring steel wire rope-friction pad dynamic micro-friction state
ActiveCN103954553AReal-time measurement of dynamic tension evolutionSimple structureUsing mechanical meansMaterial analysisEngineeringDynamic Tension
The invention discloses a testing device and a testing method for monitoring steel wire rope-friction pad dynamic micro-friction state. The testing device comprises a base frame, a loading system, a micro-slip system and a state monitoring system, wherein the loading system comprises a weight loading system, a hydraulic loading system and a steel wire rope; the micro-slip system comprises a support system, a drive system and a friction transmission system; the state monitoring system comprises a dynamic tension monitoring system, a pad stress measuring system, a friction force measuring system and a micro-slip monitoring system. By utilizing the testing device and the testing method, dynamic alternating tension can be applied to the steel wire rope and dynamic micro-friction can be applied between the steel wire rope and a friction pad simultaneously, and dynamic tension evolution of the steel wire ropes at both sides of the friction pad, micro-slip amplitudes of different sections of a contact arc of the steel wire rope and the friction pad, stress change of the friction pad near the contact zone of the steel wire rope and the friction pad and dynamic friction force between the steep wire rope and the friction pad can be measured in real time.
Owner:CHINA UNIV OF MINING & TECH
Dynamic frictional force testing system and dynamic frictional force testing method of pavement materials
InactiveCN102494993ADirect observation of appearance changesThe test result is accurateUsing mechanical meansApparatus for force/torque/work measurementTemperature controlRoad surface
The invention provides a dynamic frictional force testing system and a dynamic frictional force testing method of pavement materials, which aim at solving the problems that a skid resistant testing method in the prior art is large in deviation of testing results, cannot perform testing in all weather and is poor in stability of testing results and the like. The dynamic frictional force testing system of pavement materials comprises a turning system, a loading system, a temperature control system and a testing system. The dynamic frictional force testing system of pavement materials and the testing method adopt simulated dynamic friction and simulate temperature, rotation speed, pressure and other key factors to test dynamic frictional force of the pavement materials. The dynamic frictional force testing system and the dynamic frictional force testing method of pavement materials have the advantages of being capable of performing testing in all weather, accurate in testing results, stable in testing results, and further capable of directly observing appearance changing of the pavement materials under the dynamic friction condition.
Owner:CHONGQING JIAOTONG UNIVERSITY
Golf swing trainer
A practice device that can be used with or without a ball to help further develop the feel and muscle memory of a proper swing. A swing training device includes a handle, a shaft and a weight slidably mounted along the shaft. During the swinging of the club, the weight slides from an end near the user's hands to a distal end away from the user. When the weight reaches the distal end, the weight contacts a stop creating an audible “snap,” giving the user both tactile and audible feedback to the success of the swing. The weight preferably includes a friction adjustment device to control the amount of static and / or dynamic friction between the sliding weight and the shaft. The shaft preferably has a constant cross-sectional area or diameter to provide a set amount of friction during the travel of the weight along the shaft.
Owner:BU TECH INC
High friction brake shoe assembly
InactiveUS7320386B2Improve braking efficiencyGood friction propertiesBraking membersFriction liningEngineeringBrake shoe
A vehicle brake shoe assembly (10) having a rigid backing plate (12) incorporating a plurality of extensions (100) which project through the brake friction material matrix (22) to the outer friction surface (24) of the brake shoe assembly (10). Each extension (100) is configured to cooperate with the brake friction material matrix (22) to engage a surface of an opposing friction element (28) simultaneously with the friction material (22), increasing the static and dynamic friction performance of the assembly (10) during initial use beyond that achieved from the application of either the brake friction material (22) or the projections (100) alone.
Owner:FEDERAL MOGUL WORLD WIDE
High friction brake shoe assembly
InactiveUS6860368B2Increasing static and dynamic friction performanceBraking membersFriction liningBrake shoeDynamical friction
A vehicle brake shoe assembly having a brake shoe platform incorporating a plurality of extensions which project through the brake friction material matrix to the outer friction surface of the brake shoe assembly. Each extension is configured to cooperate with the brake friction material matrix to engage a surface of an opposing friction element, increasing the static and dynamic friction performance of the assembly beyond that achieved from the engagement of the brake friction material matrix and the surface of the opposing friction element alone.
Owner:FEDERAL MOGUL WORLD WIDE LLC
System and method for testing dynamic friction parameter
InactiveCN101226068AImplement automated testingRealize automatic identificationMeasurement devicesLocking mechanismControl theory
The invention discloses a test system and method of dynamic friction parameter, the test system is characterized in that's: an absolute encoder 14 is arranged on a motor 13, a moment sensor 4 is arranged axially between a test part, a weight fixing device 6 and a locking mechanism 2, the test part is arranged at upper and lower layers of the weight fixing device, when testing, the operation of the motor is controlled by a controller, moreover the parameters including the sampling time, friction moment, rotating speed, rotating angle and motor winding current are recorded synchronously, the evaluated value of current friction parameters are set at Sigma 0, Sigma 1, Fc, Fs, Omegas, and Sigma, and then differential equation of systematic movement is solved so as to obtain the evaluated value Theta(t) of moment motor rotating angle of each sampling time, thereby respectively calculating the errors of the evaluated values of the moment motor rotating angle and the friction moment of each sampling time, the error parameters are contrasted with the set testing parameters so as to meet the required evaluated value of the output friction parameters, otherwise correction is re-made. The test system and method of dynamic friction parameter has the advantages of convenient testing and high precision. The test system is applicable for dynamic friction parameter test on various materials.
Owner:XIDIAN UNIV
Heaving movement compensation
ActiveCN101466591AImprove performanceImprove efficiencyCargo handling apparatusDrilling rodsDynamical frictionPiston
A heave motion compensator (30, 40, 70, 100, 140, 300) for compensating heave motions comprises a cylinder (41) and a piston (44) delimiting a variable volume fluid chamber (49) in said cylinder (41), wherein said piston (44) can oscillate within said cylinder (41), said piston (44) being provided with a seal (48) frictionally engaging said cylinder. The compensator further includes a motor (65) that causes said seal (48) to revolve relative to said cylinder (41) so as to obtain a dynamic friction regime between the seal (48) and the cylinder (41). In a possible embodiment the motor (65) is arranged to rotate said piston (44), and the seal (48) is mounted on said piston (44) so as to rotate along with said piston (44).
Owner:ITREC BV
Compositions for Imparting Hydrophobicity and Water Repellency to Hair
ActiveUS20110067720A1Eliminates and reduces chalkyCosmetic preparationsHair removalPolymer chemistryDynamical friction
Compositions and methods are disclosed for imparting water repellency to the hair. The compositions generally comprise a first hydrophobic particulate material having a coefficient of dynamic friction of 0.5 or greater in combination with a second hydrophobic particulate material having a coefficient of dynamic friction less than 0.5.
Owner:AVON PROD INC
Device for testing dynamic friction torque of air static-pressure axial thrust bearing
InactiveCN103759871AHighlight substantiveReduce frictionApparatus for force/torque/work measurementElectricityFriction torque
The invention discloses a device for testing dynamic friction torque of an air static-pressure axial thrust bearing. The device for testing dynamic friction torque of the air static-pressure axial thrust bearing comprises an engine base, an electrified coil, a permanent magnet, a force sensor, a thrust collar, a main shaft rotor, an electric main shaft, a supporting shaft, and a radial air thrust bearing to be tested. The radial air thrust bearing is arranged on the supporting shaft, a pressing rod is arranged on the end face of the radial air thrust bearing, and the section extending out the pressing rod is arranged on the force sensor; the radial air thrust bearing loads axially through a non-contact type electromagnetic loading device, the electrified coil is fixed at one end of the engine base, the permanent magnet is fixed on one end face of the radical air thrust bearing, the coil has the magnetism and has the same magnetic characteristics with the permanent magnet, and the radial air thrust bearing is subject to an axial thrust. To obtain the dynamic friction torques under different axial thrusts, the non-contact type electromagnetic loading device is used for axial loading. The non-contract loading way eliminates the influence of friction caused by contact on a testing result.
Owner:SHANGHAI UNIV
Mechanical shoulder joint position control method with dynamic friction compensation
InactiveCN102501251AShorten adjustment timeGuaranteed speedProgramme-controlled manipulatorNeural network controllerProportional differential
The invention relates to a mechanical shoulder joint position control method with dynamic friction compensation, which is realized through a global control unit and a local control unit. The global control unit is used for tracking the trajectory of a mechanical shoulder joint in a global large range, the trajectory tracking is realized through a PD (Proportional Differential) controller widely applied in the mechanical shoulder joint, and the input vector of the PD controller comprises the position error of the mechanical arm joint and the change rate of the position error; and the local control unit is used for completing dynamic friction compensation in a local small range, the dynamic friction compensation is realized through a five-layer autoregressive wavelet neutral network controller having an observation layer, and the input vector of the autoregressive wavelet neutral network controller comprises the expected position, the expected speed and the actual position of the mechanical shoulder joint. The actual speed of the mechanical shoulder joint required in the autoregressive wavelet neutral network controller can be calculated through the observation layer. The mechanical shoulder joint position control method provided by the invention can be realized by only installing one position sensor in the mechanical shoulder joint without installing a speed sensor.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Hydraulic reciprocating seal dynamic property detection device and design
Owner:WUHAN UNIV OF TECH
Pipe liners and method of lining pipes
Provided herein are exemplary embodiments of novel and nonobvious liners, methods of lining passageways or pipelines using said liners, and uses of said liners. In one embodiment of the present invention, the liner comprises a resin absorbent material and a substantially impermeable coating. The substantially impermeable coating includes a modified polymer including a polymer having at least one additive incorporated thereto; wherein the dynamic coefficient of friction of the modified polymer is lower than the coefficient of friction of the polymer
Owner:APPLIED FELTS +1
Device for comprehensively measuring linear guide rail friction force and manufacturing and mounting errors
InactiveCN103940471AEnabling Dynamic Friction MeasurementsMovement speed is stableMeasurement devicesMeasurement deviceEngineering
The invention discloses a device for comprehensively measuring linear guide rail friction force and manufacturing and mounting errors, and belongs the technical fields of measurement. The device for comprehensively measuring the linear guide rail friction force and the manufacturing and mounting errors mainly comprises a linear feeding system, a guide rail and sliding block friction force measuring device, a guide rail linearity error measuring device and a guide rail mounting parallelism error measuring device. The guide rail and sliding block friction force measuring device drives a sliding block to move through a servo motor to achieve measurement of the dynamic friction force of the sliding block at different running speed and under different loading effects, and the value of the friction force can be obtained by utilizing a pull pressure sensor. The guide rail mounting parallelism error measuring device converts parallelism errors among guide rails into internal stress of a connecting rod, and the values of the parallelism errors can be obtained through measurement of the pull pressure sensor. A standard straight gauge block is utilized by the guide rail linearity error measuring device as a reference of measurement, the linearity error of the guide rails is converted into changes of compression amount of a spring, a least square method is utilized for processing, measurement is convenient, and measurement accuracy is high.
Owner:TSINGHUA UNIV
Hydraulic winch
ActiveCN102718161AImprove coaxialityImprove parallelismWinding mechanismsHydraulic motorReduction drive
The invention relates to a hydraulic winch, comprising a machine frame, a winding barrel, a hydraulic motor, and a hydraulic brake, a planet gear speed reducer and a hydraulic clutch which are arranged in the winding barrel. The hydraulic clutch comprises an outer barrel, a clutch friction plate and a clutch oil cylinder. A bearing shaft is fixed on the machine frame. The outer barrel and a piston of the clutch oil cylinder are fixed on the bearing shaft through bearings respectively. The piston is in transmission connection with an output end of a planet carrier of the planet gear speed reducer. The outer barrel and the piston are fixed on the bearing shaft, so that the outer barrel, the piston and the bearing shaft have a relatively high coaxiality, and a dynamical friction plate and a static friction plate which are arranged on the outer barrel and the piston respectively have relatively high parallelism. The dynamical friction plate and the static friction plate can be well contacted with each other and completely separated from each other as well so that the hydraulic winch has more stable and reliable clutch performance, and the abrasion and the heat generation of the clutch friction plate are reduced. In the hydraulic winch, transmission efficiency and operational reliability can be improved, and service life can be prolonged. The hydraulic winch has a simplified integral structure and higher machining and assembling manufacturability.
Owner:INI HYDRAULIC
Medical coating test apparatus and method
InactiveUS20060081031A1Weather/light/corrosion resistanceUsing mechanical meansTest sampleEngineering
The present invention presents novel apparatus and methods to address the problem of measuring surface characteristics of a coated medical device. A preferred embodiment of the invention incorporates a processor-controlled transport module to move a test sample at a predetermined velocity profile past a variety of fixtures. The fixtures include a processor-based, feedback-controlled servo mechanism that applies an predetermined normal force on a test sample with selected test surfaces to measure dynamic friction, abrasion resistance and durability of a coating. More generally, the invention can be used to characterize surface and pull or push properties of a wide variety of objects that also include threads, filaments, rods, tubing, wires, extrusions, films and ribbons.
Owner:HARLAND MEDICAL SYST
Bionic sensor for testing dynamic friction of fabric
InactiveCN101520406ASimple structureEasy to installForce measurementUsing mechanical meansFiberElastomer
The invention provides a bionic sensor for testing dynamic friction of fabric. The sensor consists of a friction head embedded with a PVDF film and a cantilever structure of a thin girder elastomer; and the cantilever structure is symmetrical according to the axes which are vertical with each other. The sensor comprises the PVDF film, an acrylic resin solidified body connecting rod, an acetate fiber film, vulcanized rubber, a vertical type strain girder, a horizontal type strain girder, a pedestal, a connecting girder and another connecting girder. The bionic sensor of the invention has simple structure, convenient mounting, large integrated rigidity, high inherent frequency and sensitivity of each direction of two-dimensional force, can be used for the friction test of fabric tactility evaluation and has rotary and reciprocating sliding flexibility.
Owner:DONGHUA UNIV
Medical components having coated surfaces exhibiting low friction and methods of reducing sticktion
This invention relates to components useful for medical articles, such as a syringe assembly, having sliding surface(s) coated with a composition including organopolysiloxane(s), the coating being adhered to the surface(s) of the component by crosslinking induced by oxidative treatment and irradiation with an isotope, electron beam or ultraviolet radiation or heat treatment; medical articles including the same; methods to reduce static and kinetic friction between slidable surfaces; and articles of low friction prepared thereby.
Owner:BECTON DICKINSON & CO
Method and device for controlling rotational joints of robot to move and robot
ActiveCN107263467AReduce vibrationImprove controlProgramme-controlled manipulatorFriction torqueDrive motor
The invention discloses a method for controlling rotational joints of a robot. The method comprises the steps that a track parameter set for controlling the rotational joints of the robot to conduct track motion is received; according to each uniform motion speed, the rotational joints of the robot are controlled to do the track motion corresponding to the uniform motion speed, and the driving torque of a driving motor of the robot is read in the uniform motion stage of track motion to serve as measurement friction torque; a dynamic friction model is built according to each uniform motion speed and the measurement friction torque corresponding to the uniform motion speed; and when a request for controlling the robot to work is received, driving torque generated through the request is corrected based on the dynamic friction model so that the rotational joints can move according to the corrected driving torque. The invention further discloses a device for controlling the rotational joints of the robot, and the robot. By the adoption of the method and device for controlling the rotational joints of the robot and the robot, errors of the robot during friction force identification can be decreased, and the control accuracy of the rotational joints of the robot is improved.
Owner:GUANGZHOU SHIYUAN ELECTRONICS CO LTD
Image forming process and image forming apparatus
The image forming apparatus comprises a photoconductor, a latent electrostatic image forming unit for forming a latent electrostatic image on the photoconductor, a developing unit for developing the latent electrostatic image using a developer comprising a toner to form a visible image, a transfer unit for transferring the visible image to a recording medium, a cleaning unit for removing the developer remained on the photoconductor surface and a developer amount detection unit for detecting developer amount adhering to the photoconductor surface by a reflecting photosensor, wherein the developer stirring time per copy when one copy is made from an original, is 2 to 6 times the developer stirring time per copy when two or more copies are made from the original, wherein the toner comprises at least a binder resin and a wax, and the dynamic frictional coefficient of the toner is 0.15 to 0.45.
Owner:RICOH KK
Device for testing dynamic friction torque of precise micro rolling bearing
InactiveCN102778313AOutstanding FeaturesHighlight significant progressMachine bearings testingWork measurementFriction torqueCoupling
The invention relates to a device for testing the dynamic friction torque of a precise micro rolling bearing. The device comprises a machine base, an air static pressure suspension bearing block, two sets of tested bearings, a driving electric spindle, a pressure sensor and a speed sensor, wherein the two sets of tested bearings are arranged in a central hole of a suspension shaft in the air static pressure suspension bearing block; a rotary central spindle is sleeved in the central hole of the two sets of tested bearings and is connected with the driving electric spindle through a rubber hose flexible coupling; the pressure sensor is arranged on the part close to the left end of the suspension shaft; and the speed sensor is arranged on the part close to the right end of the suspension shaft. The dynamic friction torque of the tested bearings can be tested in real time in a start process, a stop process and an operation process with different rotation speeds.
Owner:SHANGHAI UNIV
Soft tissue paper having a polyhydroxy compound applied onto a surface thereof
A tissue paper product having at least one ply, wherein only one outer surface of said tissue paper product has a polyhydroxy compound applied thereto by slot extrusion, said polyhydroxy compound providing said tissue paper product with a Wet Burst greater than about 90 g, a Dynamic Coefficient of Friction less than about 0.9, and a Bending Flexibility less than about 0.1 gf cm2 / cm.
Owner:THE PROCTER & GAMBLE COMPANY
Rubber dynamic friction wear detection device
InactiveCN102590078AReasonable structureThe principle design is safe and reliableUsing mechanical meansMaterial analysisTemperature controlElectric machine
The invention relates to a rubber dynamic friction wear detection device, belonging to the technical field of machinery. An electric machine is connected with a driving pulley and a belt type transmission structure is formed by a belt and a driven pulley. The driven pulley is fixed on a main shaft and forms a middle transmission structure together with a bearing. A support plate is mounted on the left side of the main shaft near to the driven pulley. An eccentric wheel fixed on the right side of the main shaft is connected with a sliding body by a connection rod. A slide detection platform is fixed on a guide rail, the upper end side of the slide detection platform is fixedly connected with a friction sample plate for detection, a temperature control device is mounted in the platform, a load adjustment device is arranged right above the platform, a sample clamping device is fixed on the load adjustment device, a force application handle is formed on the top of a screw rod, a displacement control handle formed besides the force application handle is fixed on the load adjustment device by a lead screw and the load adjustment device is vertically fixedly connected with the support plate. The rubber dynamic friction wear detection device has the characteristics of reasonable structure, safe and reliable principle and low cost, and is simple to manufacture, convenient to control and operate, the detection is accurate and has good effect, and the detection technology is convenient and easy.
Owner:QINGDAO UNIV OF SCI & TECH
System for accurately testing friction damping
ActiveCN101907557AWith frictionWith displacementForce measurementUsing mechanical meansAutomatic controlDrive motor
The invention discloses a system for accurately testing friction damping. The system comprises a piston, a damping sealing member, a sleeve, a piston rod, force sensors, a cutting sleeve coupler, a displacement sensor, a driving motor, a measurement control platform, an experiment table body and a sleeve centering adjusting rod. The piston, the damping sealing member and the sleeve are matched together to simulate a moving part structure of a liquid rocket valve, and then are assembled together with the experiment tale body and the sleeve centering adjusting rod to form an experiment table of friction testing system; the piston is in rigid connection with the driving motor through the piston rod and the cutting sleeve coupler; the force sensors at two ends of the sleeve and the displacement sensor of the driving motor are connected with the measurement control platform; and the driving motor is connected with the measurement control platform to form a control test bed of the friction testing system. The system provides a valve piston friction structure for simulating reality, adopts a driving mode combining direct driving and macro-micro motions, and has the advantages of automatic control, high control accuracy, high reciprocating frequency, large motion stroke, high dynamic frictional force measurement accuracy and the like.
Owner:BEIJING INST OF ASTRONAUTICAL SYST ENG
Construction method of car steel plate spring multi-body model
ActiveCN102609578AAccurately reflect dynamic force characteristicsAccurate Ride SimulationSpecial data processing applicationsDynamic stiffnessStructural engineering
The invention discloses a construction method of a car steel plate spring multi-body model. The construction method comprises the following steps: firstly, testing static stiffness and dynamic force of a steel plate spring; secondly, establishing a dynamic friction model; thirdly, establishing the steel plate spring multi-body model in a multi-body dynamics program; fourthly, adding a dynamic dry friction model to the steel plate spring multi-body model; and fifthly, establishing a suspension system model for simulating a suspension and an entire car. In the construction method, dry friction among steel plate spring reeds is uniformly processed as characteristics of plate spring assembly, and assembly dry friction is described by the dynamic friction model, therefore, dynamic force characteristics of the car steep plate spring can be accurately reflected to reflect the dynamic stiffness formed by the friction, and ride comfort simulation is more accurate.
Owner:CHONGQING CHANGAN AUTOMOBILE CO LTD
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