269 results about "Restoring force" patented technology

The invention provides a rotary table bearing-torque motor thermal vibration coupling modeling method, and relates to the technical field of machine tool reliability analysis. Comprising the steps of calculating bearing restoring force, torque and elastic rigidity; giving a dynamic balance equation of the main shaft system; unbalanced magnetic pulling force and unbalanced mass excitation are calculated; a displacement field is solved, and load changes caused by the displacement field are transmitted to the thermal model; the contact force borne by the bearing is updated by considering the load effect related to displacement, and the friction heat generation of the bearing and the heat generation of each part of the motor are calculated; calculating thermal deformation and thermal displacement of the bearing; thermal resistance among nodes is calculated, and a temperature field equilibrium equation is given through a thermal resistance network to achieve rapid thermal-mechanical coupling analysis; the thermal equilibrium equation is solved to calculate temperature response; importing the latest temperature into the kinetic model; lubricating grease viscosity and bearing thermal deformation are updated; and repeating the steps to finally obtain the main shaft displacement field and temperature field response. The method is high in accuracy, high in universality, low in test cost and high in test efficiency.

The invention belongs to the technical field of simulation analysis, and particularly relates to an electric spindle multi-physics field coupling simulation method. The motorized spindle multi-physics field coupling simulation method comprises the following steps that S100, a multi-physics field coupling model is established through finite element software, wherein the steps of geometric model importing, material setting, rotor dynamics module setting, solid heat transfer module setting and grid division are included; and S200, solving through the finite element software: carrying out multi-physics field coupling on the bearing nonlinear restoring force model, the motor unbalanced magnetic pulling force model and the main shaft thermal model with the motorized main shaft rotor model, and solving to obtain the dynamic performance. By using the simulation model for motorized spindle dynamic characteristic research in the technical scheme, the dynamic characteristic research requirement of the motorized spindle under the actual complex working condition can be met.

The invention provides a quasi-zero stiffness vibration isolation device and a track trajectory determination method and system, and relates to the technical field of precise supporting and vibration isolation. By adopting the horizontal telescopic guide rod, the linear spring and the nonlinear track, the sliding end of the telescopic guide rod is propped against the track to slide under the thrust of the linear spring. In the moving process of the mass block, the sliding track of the sliding end is a nonlinear similar parabola. The linear spring is pushed by the track due to the change of the parabola-like track during sliding, and the compression degree of the linear spring is changed, so that the magnitude of the acting force applied to the track by the sliding end is changed. The change of the track changes the direction of the counter-acting force of the track to the sliding end. Based on the synergistic effect of the horizontal telescopic guide rods, the linear springs and the quasi-parabola non-linear orbits, non-linear restoring force is generated through the non-linear shape of the orbits, quasi-zero-stiffness vibration isolation is achieved, negative-stiffness springs are prevented from being adopted, and the structure of the vibration isolation device is simplified in the mode that the orbits with the simple structure are adopted.

The invention relates to a stress calculation method, device, equipment and medium for a floating type draught fan foundation structure, and the method comprises the steps: carrying out the frequency domain potential flow water power analysis of a wet surface element model of a foundation floating body of a floating type draught fan, and obtaining the water power pressure distribution and a water power coefficient; boundary conditions are applied to the simulation model of the floating type wind turbine foundation structure, various working conditions are loaded, finite element analysis is carried out based on hydrodynamic pressure distribution, and various structural stress transfer functions are obtained; based on the hydrodynamic coefficient, performing linear processing on the fan aerodynamic force, the impeller pneumatic torque, the floating body hydrodynamic force and the mooring restoring force of the floating fan and the influence of a fan servo controller on the floating fan, and substituting a linearization result into a motion equation of the floating fan for calculation to obtain a plurality of dynamic response spectrums; and multiplying the structural stress transfer functions by the corresponding dynamic response spectrums, and adding a plurality of multiplied results to obtain a total stress spectrum. The method can improve the efficiency.

The invention belongs to the technical field of ocean information engineering, and discloses a joint simulation method for a structure collision effect in a floating installation process of an offshore converter station. The joint simulation method comprises the following steps: S1, setting sea condition parameters of an operation sea area and geometric parameters and material parameters of a floating system; s2, initializing a hydrodynamic model and a multi-body model; s3, solving the barge motion equation under the current time step by using the hydrodynamic model to obtain barge motion data; s4, calculating an LMU contact force and a DSU contact force under the current time step according to the barge motion data in the step S3, feeding back the LMU contact force and the DSU contact force to the hydrodynamic model, and updating the external load of the barge; and S5, repeating the steps S3-S4 until simulation in the set time step is completed, and then outputting a simulation result. According to the method, precise calculation of dynamic movement of the floating body and precise simulation of complex contact-nonlinear restoring force of the LMU can be considered, and high-precision simulation analysis of the whole floating installation process of the offshore converter station is achieved.

A percussion instrument stand includes an instrument support structure that supports the percussion instrument; a main body that supports the instrument support structure on a support base resting on a surface. The instrument support stand also includes a dampening system that absorbs impact energy transferred to the stand by a user playing the instrument via displacement off of an equilibrium orientation. The dampening system also provides a restoring force that returns the dampening system to the equilibrium orientation.

The invention provides a sliding guide rail system kinetic analysis method considering abrasion and creep, and relates to the technical field of numerical control machine tool kinetic analysis. The method comprises the following steps: firstly, establishing a multi-source wear model of a joint surface of an angular contact ball bearing, a lead screw-nut pair and a sliding guide rail, and constructing a creep degradation model of a bearing end cover bolt based on a Norton creep law; then correcting the elastic restoring force of the guide rail system by combining the evolution laws of the abrasion loss and the creep, and constructing a dynamic model of the bidirectional sliding guide rail system considering the comprehensive influence of the abrasion and the creep; bidirectional influence among abrasion, creep deformation and dynamic response is achieved, and finally the dynamic evolution law of the bidirectional sliding guide rail system under the long-term service condition is obtained. The method is clear in modeling process, high in universality and high in calculation precision, the degradation process of the dynamic characteristics of the guide rail system along with the service time can be truly reflected, and an effective theoretical basis is provided for numerical control machine tool service life prediction, structure optimization and operation reliability improvement.

[Problem] To facilitate the manufacture of a bearing seal that prevents electrical corrosion of a rolling bearing. [Solution] A bearing seal 1 for use in a rolling bearing comprises an annular sealing ring 2. The sealing ring 2 comprises a core metal 3 having a section 3B that contacts an outer ring 11, and an elastic body 4 connected to a laterally outer BO surface of the core metal 3. The elastic body 4 has an inner diameter lip section 7 extending toward an outer circumferential surface 12A of the inner ring 12 and inclined in a laterally outer direction BO as it approaches the outer circumferential surface 12A. A conductive element 5 is held such that an inner diameter section D, extending in a substantially radial direction R between the core metal 3 and the elastic body 4, abuts it.The conductive element 5 has a section that contacts the inner ring 12 and has an annular shape in a substantially single plane, which is its shape prior to installation of the bearing seal in the rolling bearing. The conductive element 5 is pressed by a restoring force of the inner diameter lip section 7, which is elastically deformed to contact the inner ring 12 while installed in the rolling bearing.

The invention provides polishing equipment for high-refraction lens production and processing and a using method thereof, and relates to the technical field of polishing equipment, the polishing equipment comprises a rack, a transmission mechanism is fixedly connected to the surface of the top end of the rack, a second motor drives a gear to rotate in a rotating groove, and the gear synchronously drives two sets of sliding rods to slide in opposite directions in a sliding groove; meanwhile, a sliding rod synchronously drives a transmission plate, so that two groups of fixing plates and rubber pads on the transmission plate clamp the lens, the fixing plates drive a rotating rod to rotate in a rotating seat, the rotating rod drives a torsion spring to twist, then the rotating rod is driven to reset and rotate through the restoring force of the torsion spring, and the rubber pads abut against the lens; the angle of the two sets of fixing plates can be adjusted, so that the two sets of rubber pads and the fixing plates can clamp and process circular lenses with different radians, and meanwhile, due to the design of the rubber pads, the situation that the lens surface is damaged due to the fact that the lens clamping force of the fixing plates is too large can be prevented.

The application discloses a press-fitting method and tool for eliminating tolerance accumulation, and aims to solve the problem of press-fitting failure and gap on the bottom surface caused by height dimension tolerance accumulation when interference fitting is performed on two-part components. The method of the application adopts a press-fitting tool with a pressure spring, and the tool is composed of a connecting rod, a pressure spring, a base, a nut and a punch. During the press-fitting process, when the two components are about to be in place but not completely in place due to the tolerance, the press continues to press down to compress the spring in the tool, and the elastic restoring force generated after the spring is compressed is used to finally press-fit the two components to the completely adhering state. The application eliminates the influence of the part machining tolerance on the press-fitting depth through the spring compensation mechanism, is convenient to operate, has good press-fitting consistency, and significantly improves the product qualification rate.

The invention discloses an outer rotating tower type mooring device and method for a pool model test. The outer rotating tower type mooring device and method are used for solving the problem that a test platform cannot rotate freely. The device comprises a supporting frame, a sensor, a bearing seat and a rotating assembly, one end of the supporting frame is connected with a ship model, and the other end, away from the ship model, of the supporting frame is provided with an opening structure; at least one part of the sensor penetrates through the opening structure, and the bearing seat is connected with the sensor; the rotating assembly comprises a rotating shaft and a hanging scaffold used for mooring an anchor chain, one end of the rotating shaft is rotatably connected with the bearing seat, the other end, away from the bearing seat, of the rotating shaft is connected with the hanging scaffold, the hanging scaffold drives the rotating shaft to rotate synchronously when rotating, and the sensor is used for collecting mooring restoring force and dynamic response data information of the ship model. The device can ensure the synchronous free rotation of the rotating shaft and the hanging scaffold, and can effectively reproduce the free rotation characteristic of the external rotating tower type mooring system in engineering practice.

The present invention discloses a vehicle, a braking system, a brake, and a method for monitoring the braking condition. In the brake, the flange rotor is connected to the motor shaft and additionally to the stator via a rolling connection, so that the flange rotor can rotate together with the shaft of the brake motor relative to the stator. A slotted disk is arranged on the stator; an armature is connected to the flange rotor via a spring element, so that the armature can move back and forth between the flange rotor and the slotted disk along the axis of the flange rotor; a permanent magnet generates a first magnetic force on the armature. When the coil is de-energized, the first magnetic force opposes the restoring force, causing the armature to move towards the slotted disk and engage with it. When the coil is energized, it generates a second magnetic force on the armature.The combined force of the second magnetic force and the restoring force opposes the first magnetic force, causing the armature to move towards the flange rotor and detach from the slotted disc. This locks and unlocks the corresponding brake motor. The brake is integrated into the motor, reducing the size, noise, and energy loss of the braking system, as well as manufacturing and testing difficulties.

A plurality of combined type independent cylinders can be installed in a cushion body side by side, and each combined type independent cylinder is composed of a first compression spring and a second compression spring. The first compression spring is provided with a top part, a bottom part, a cylinder body connected between the top part and the bottom part, an air chamber formed in the cylinder body, and a connecting part arranged at the bottom part, and is used for controlling the cylinder body to elastically deform when the top part is stressed. The second compression spring is oppositely provided with a top edge and a bottom edge, the top edge is installed on the connecting part so that the first compression spring and the second compression spring can be stressed together, the restoring force of the second compression spring can be controlled to be larger than that of the first compression spring, and therefore the first compression spring can relatively weaken aftershock of the second compression spring. Therefore, the pad body applying the composite independent cylinder has comfort and restorability.

This invention relates to a method for calculating the restoring force caused by the surface tension of liquid fuel in a storage tank: A ground-based scaled-down storage tank control group is constructed, comprising three sets of scaled-down storage tanks, with each set consisting of two tanks filled with different test solutions; a ground swaying test is conducted on the ground-based scaled-down storage tank control group, and the first-order swaying fundamental frequency is recorded; the first-order resonance process of each ground-based scaled-down storage tank in the ground swaying test is equivalent to that of a simple pendulum model; and the gravitational acceleration g between the control groups formed by the same scaled-down storage tank radius and different test solutions is calculated. mn Based on the proportional relationship between the internal liquid surface tension and the equivalent acceleration generated by the internal liquid surface tension, the equivalent acceleration generated by the internal liquid surface tension of the scaled-down tanks in various locations is calculated. According to the principle that the liquid-filled tank of the spacecraft is proportional to the Bond number of the on-orbit environment, the equivalent acceleration generated by the internal liquid surface tension under the actual on-orbit operating conditions is extrapolated, and then converted into the restoring force caused by the surface tension of the liquid fuel inside the tank.

The utility model discloses a clamping device which comprises a main shell, two clamping arms are arranged on the two sides of the main shell, at least one sliding block is arranged on the main shell in a sliding mode, and at least one clamping arm is arranged on the sliding block in a sliding mode. The sliding block is movably locked on the main shell through a locking structure, an unlocking structure is arranged on the locking structure, a first elastic structure is arranged on the sliding block, and when the sliding block is locked on the main shell, the first elastic structure is elastically deformed; when the unlocking structure is unlocked, the sliding block slides outwards from one side of the main shell under the action of restoring force of the first elastic structure. The clamp has the advantages of being simple in structure, convenient to operate and even in clamping force of different widths.

A rotary operating element for controlling a function of a machine is provided. The rotary operating element (10) comprises a shaft (12), wherein the shaft (12) is rotatable to provide a rotary control function and wherein the shaft is actuatable in an axial direction of the shaft to provide an axial control function. The shaft (12) has a default position in the axial direction. The rotary operating element (10) further comprises a restoring assembly (15) configured to apply a restoring force in the axial direction to the shaft (12) to return the shaft into the default position. The restoring assembly (15) is a magnetic restoring assembly that comprises a first component (20) coupled to a housing (11) of the rotary operating element (10) and a second component (30) provided on the shaft (12). The first component (20) and / or the second component (30) comprises a magnet (40). The first component (20) and the second component (30) are configured to interact magnetically to generate the restoring force when the shaft (12) is moved in axial direction out of the default position.

The utility model relates to the technical field of extrusion dies, and discloses an extrusion die for processing aluminum alloy sections, which is characterized in that a fixed part and a fastening part are fixedly arranged on the inner walls of the two sides of the top of a bottom plate respectively, the fastening part is positioned on the outer side of the fixed part, movable frames are mounted at the top ends of the fastening part, and clamping blocks are arranged at the ends, close to each other, of the two movable frames; a sliding groove is formed in the upper surface of the movable frame, the fixing piece is connected to the inner wall of the sliding groove in a sliding mode, the fixing piece is sleeved with a pressure spring, and the pressure spring is located between the movable frame and the bottom plate. Through the arrangement of the clamping blocks and the compression springs, the position of the linkage plate is adjusted through the sliding rails, so that the clamping blocks clamp the two sides of the linkage plate under the action of the compression springs, primary blank fixing is completed, the clamping blocks loosen the linkage plate under the elastic restoring force of the compression springs, meanwhile, the tension springs pull the mounting blocks to reset to the initial position along the sliding rails, and finished products can be taken out conveniently and prepared for the next cycle; and the machining efficiency of the die is improved.

The application belongs to the technical field of simulation analysis, and particularly relates to a multi-physical field coupling simulation method of an electric spindle. The multi-physical field coupling simulation method of the electric spindle comprises the following steps: S100, a multi-physical field coupling model is established through finite element software, including: importing a geometric model, setting a material, setting a rotor dynamics module, setting a solid heat transfer module and mesh division; S200, solving is performed through the finite element software, including: performing multi-physical field coupling of a bearing nonlinear restoring force model, a motor unbalanced magnetic pull model and a spindle thermal model with the electric spindle rotor model, and obtaining dynamic performance by solving. The simulation model for the dynamic characteristic research of the electric spindle in the technical scheme can meet the demand of the dynamic characteristic research of the electric spindle under actual complex working conditions.

The invention relates to the technical field of compressors, in particular to a linear motor of a linear compressor and the linear compressor, a rotor assembly comprises main magnetic steel, and the main magnetic steel reciprocates under the action of a magnetic field excited after a stator assembly is electrified; the electromagnetic spring comprises a first electromagnetic spring and a second electromagnetic spring which are arranged on the two axial sides of the main magnetic steel, and the direction of the spring resultant force of the first electromagnetic spring and the second electromagnetic spring is opposite to the displacement direction of the main magnetic steel. The direction of spring resultant force of the electromagnetic spring is opposite to the displacement direction of the main magnetic steel, so that the main magnetic steel is always subjected to restoring force towards a reciprocating motion center in the motion process, a compression piston of the linear compressor can be assisted to automatically return to the center, the piston offset resistance of the linear compressor is improved, and the cylinder collision risk is effectively reduced; and the electromagnetic spring does not have the material fatigue fracture risk of a traditional mechanical spring and can normally work for a long time at the demagnetization temperature, and the reliability is further improved.

The invention belongs to the technical field of hybrid magnetic suspension bearings, and discloses a staggered self-centering hybrid magnetic thrust bearing structure and a restoring force calculation method. According to the staggered self-centering hybrid magnetic thrust bearing structure, a radial repulsive force ring is used for generating a restoring force which counteracts the unbalanced force of an axial repulsive force ring in the radial direction and the gravity of a rotor, and the stability of two offset freedom degrees in a radial plane of the rotor is maintained; the axial repulsive force rings are used for counteracting unbalanced loads of the radial repulsive force rings in the axial direction and external axial loads and maintaining the stability of the rotor in the axial direction; the axial electromagnetic bearing is used for counteracting the overturning moment of the rotor around the radial plane and maintaining the stability of the rotor around the transverse rotation freedom degree and the vertical rotation freedom degree. The restoring force calculation method does not need to depend on finite element simulation, is suitable for occasions where calculation resources are limited and parameters in the initial stage of design need to be rapidly iterated, and has good rapidity, practicability and convenience in actual engineering application.

The utility model provides a water pump which comprises a return part, a shaft sleeve, a gear assembly, a relatively static guide part and an expansion part, the gear assembly comprises a first gear part and a second gear part which are in direct or indirect transmission, and the shaft sleeve is relatively fixed on the inner side of a rotor and rotates relative to a main shaft. The shaft sleeve can expand, deform and restore in the radial direction; the first gear part and the main shaft are matched and rotate together; the second gear part is matched with the expansion part, limits relative movement around the axial direction, and does not limit relative movement in the axial direction; the guide part is arranged to guide the expansion part to the position where the shaft sleeve is expanded and deformed in the axial direction and guide the expansion part to the position where the shaft sleeve is disengaged in the axial direction. The return member directly or indirectly applies a return force to the expansion member. According to the utility model, automatic release of adhesion between the main shaft and the rotor of the water pump is realized, and meanwhile, automatic recovery is realized to deal with next adhesion.

To provide a damping device for further reducing the response acceleration of a base isolation structure having fixed restitutive force.SOLUTION: The damping device includes a piston, a cylinder slidably storing the piston and having a first chamber and a second chamber which are filled with fluid, the first chamber being located on one side in the sliding direction of the piston, the second chamber being located on the other side in the sliding direction, a first flow path communicating the first chamber and the second chamber with each other and having a first flow path resistance, a second flow path as a different flow path from the first flow path, communicating the first chamber and the second chamber with each other, and having a second flow path resistance smaller than the first flow path resistance, and a changeover part for changing over the possibility or not of passing the fluid in the second flow path in one or both of a right direction as a direction from the first chamber side to the second chamber side and a left direction as a direction from the second chamber side to the first chamber side, on the basis of a relative position of the piston to the cylinder.SELECTED DRAWING: Figure 2

The utility model discloses a reset switch. A body is provided with an accommodating cavity; the common end assembly is accommodated in the accommodating cavity; the elastic sheet assembly is accommodated in the accommodating cavity; the rotating handle is contained in the containing cavity, gear grooves distributed in a circumferential array mode are formed in the lower end of the rotating handle, and the rotating handle rotates relative to the body. The reset assembly is contained in the containing cavity, matched with the end, close to the top face of the body, of the rotating handle and gives restoring force to the rotating handle. The gear assembly is contained in the containing cavity and comprises a support and an elastic structure, the support is located above the bottom face of the containing cavity, a groove is formed in the support, the elastic structure is contained in the groove, and one end of the elastic structure extends out of the groove to be matched with the gear groove; the structure is independently mounted, so that the mounting is more convenient, the efficiency is improved, and meanwhile, technicians in the field have an expansion trend about the structure.

The application discloses an aircraft wing adjusting mechanism and adjusting method, and relates to the technical field of aircrafts. The aircraft wing adjusting mechanism comprises a guide part, a moving part, a first elastic temperature control assembly and a locking part. The guide part is fixedly arranged at both ends in the body. The moving part is fixedly connected with the moving end of the wing and can move along the guide part. The first elastic temperature control assembly is arranged between the guide part and the moving part. The first elastic temperature control assembly is deformed after being powered on, can drive the moving part to move in the first direction, and can drive the moving part to move in the second direction under the action of the elastic restoring force after being powered off. The locking part is arranged on one side of the guide part. The contraction and expansion of the wing can be realized through the power-on and power-off of the first elastic temperature control assembly and the cooperation of the locking part. The design requirements of the lightweight and compact design of the morphing aircraft can be met. Moreover, the transmission stage number is small, and the control mode of power-on and power-off has higher reliability and economy.

The invention discloses an automobile instrument desk front end storage box which comprises a lower shell, an upper shell, a cover plate assembly, a supporting arm assembly, a locking mechanism assembly and an inertia lock assembly, an inserting groove of the lower shell and an inserting buckle of the upper shell are connected in an inserting mode and fastened through a screw, the cover plate assembly is connected with the upper shell through the supporting arm assembly in an opening and closing mode, and the locking mechanism assembly is connected with the inertia lock assembly in an opening and closing mode. The locking mechanism assembly used for locking the cover plate assembly is connected with the right side of the upper shell in a fastened mode, the inertia lock assembly used for preventing J emergency brake inertia is connected with the left side of the upper shell in a fastened mode, when the cover plate assembly is closed, the elastic restoring force effect of a supporting arm torsional spring and a tension spring is achieved, and when the cover plate assembly is opened, damping, closing and opening of a first damper are achieved. Noise is avoided, and the user experience is good; in addition, the cover plate assembly is prevented from being opened due to sudden brake through the inertia lock assembly.

The invention discloses a hybrid self-resetting support provided with a rate-dependent viscoelastic damper, which belongs to the technical field of seismic resistance of structural engineering, and comprises an outer pipe, an inner plate, a viscoelastic damper, a shape memory alloy U-shaped damper and channel steel, the viscoelastic damper is formed by stacking a viscoelastic material layer and a steel plate, is fixed between the inner plate and the outer pipe, and is arranged at the end part of the inner plate; when an earthquake acts, the inner plate moves in the axial direction relative to the outer pipe, the viscoelastic material layer is driven to be subjected to shear deformation, and damping force related to the loading frequency is provided; in addition, a plurality of shape memory alloy U-shaped dampers are arranged between the inner plate and the outer pipe at intervals in the supporting axial direction, and the self-resetting capacity is provided through bending deformation. The U-shaped damper and the viscoelastic damper are stressed in parallel, damping energy consumption and restoring force are generated at the same time, the floor acceleration and the base shearing force can be effectively reduced, and the device has the advantages of being simple in structure and reliable in connection.

The invention discloses a key structure and XR equipment, and relates to the technical field of wearable equipment, the key structure comprises a roller and an elastic sheet, the roller is rotatably installed in a shell around the axial direction of the roller, a part of the outer edge of the roller penetrates through an avoiding hole and is exposed out of the shell, the part of the outer edge of the roller exposed out of the shell forms an operation area, and the elastic sheet is arranged in the operation area. A plurality of grooves and bulges which are alternately arranged in sequence are arranged on the roller in the circumferential direction of the roller; the elastic piece is located in the shell, when the roller is driven by the operation area to rotate around the axial direction of the roller, the elastic piece can be alternately matched with the groove and the protrusion in sequence, when the elastic piece is matched with the protrusion, the elastic piece is configured to abut against the protrusion so as to be pressed to contract, and when the elastic piece is matched with the groove, the elastic piece is configured to stretch into the groove through elastic restoring force. Rotation feedback is achieved through alternate cooperation of the elastic pieces, the grooves and the protrusions, a vibration motor does not need to be arranged, the structure is simple, the occupied size of XR equipment is small, cost is low, and the overall product cost of the XR equipment is reduced.

The present invention relates to a pulling and pushing element (20), in particular a drawer, a tray or a drawer frame, a pulling and guiding device (1), which has: a body rail (2) that can be fixed to the body; a pulling rail (3) that can be fixed to the pulling and pushing element (20), the pulling rail is movably guided relative to the body rail (2) and has an upper rail leg (3a) in the assembled position, and its upper side (8) forms a support for the pulling and pushing element (20); a front adapter (10), which is fixed to the front end of the pulling rail (3) along the pulling direction (7) of the pulling rail and has a locking projection (14), the locking projection protrudes upward from the notch (15) of the upper rail leg (3a) above the upper side (8) in the initial position and can be deflected downward from the initial position against the action of the restoring force to a position flush with the upper side (8). The locking projection (14) is arranged to be deflectable only linearly in a direction (16) perpendicular to the upper side (8) of the upper rail leg (3a).

The embodiment of the invention relates to the technical field of machine tool equipment design and manufacturing, and provides a dynamic parameter off-line identification method for a ball screw linear feeding system, which comprises the following steps: establishing a dynamic equation according to the rigidity distribution type of the ball screw linear feeding system; steady-state input torque signals of the feeding system at different uniform speeds are collected through the experimental platform, and a steady-state friction force sequence is obtained; based on the kinetic equation, the steady-state friction force sequence and the corresponding feeding speed, a segmented fitting method is adopted to identify steady-state friction parameters; applying harmonic moment excitation meeting an amplitude constraint condition to the feeding system, and identifying a dynamic friction parameter and a linear restoring force parameter based on a kinetic equation; harmonic moment excitation is applied to the feeding system, an acceleration response signal is collected, and nonlinear restoring force parameters are identified through moment input and acceleration response output of the feeding system and based on a kinetic equation. Therefore, the dynamic parameter off-line identification of the ball screw linear feeding system is realized.

This invention relates to the field of magnetorheological vibration damper technology, and in particular to a magnetorheological vibration damper and its control method, system, and vehicle, comprising: an oil reservoir and a piston assembly and a floating piston slidably disposed within the oil reservoir; further comprising: a restoring force superposition component, which includes a built-in spring and a spring washer disposed at the end of the built-in spring; the built-in spring is sleeved on the piston rod, wherein, in the damper's mounted state, the built-in spring is in a pre-compressed state, and its elastic restoring force is used to at least partially offset the counterforce generated by the high-pressure gas below the floating piston; this invention, through the setting of a variable stiffness built-in spring, achieves adaptive mechanical characteristics of gentle comfort under small excitation and strong support under large excitation, enabling the vibration damper to match the force requirements of different working conditions only through the stiffness change of passive mechanical components without increasing the electromagnetic coil current.