39results about How to "Reduce micro vibration" patented technology

A six-degree-of-freedom micro vibration suppression platform includes a basic platform, a load platform, six sets of single-degree-of-freedom active and passive composite vibration isolation devices that are exactly the same and a controller. Upper and lower ends of each set of single-degree-of-freedom active and passive composite vibration isolation devices are connected with the load platform and the basic platform, respectively. A control method includes: calculating a logical axis signal, calculating a logical axis control signal, calculating physical axis real-time control signals and a transfer step.

The invention proposes a smart vibration isolator for micro-vibration control. The smart vibration isolator for micro-vibration control comprises a housing 1, a magnetorheological elastomer 2, a force output rod 3, a sliding bearing 4, a cover board 5, a magnetic mass block 6, a piezoelectric ceramic pile 7, a pressing bolt 8, a connection base 9, a steel ball 10 and a coil 11. The smart vibration isolator adopts a cascade form of the magnetorheological elastomer and the piezoelectric ceramic pile, selects working states of the piezoelectric ceramic pile and the magnetorheological elastomer by switching control according to the excitation frequency, and achieves semi-active / full-active two-stage vibration isolation of vibration. By adopting the smart vibration isolator for micro-vibration control, the advantages of the stability, the controllability, good dynamic characteristics and large output force of the piezoelectric ceramic pile vibration isolator are considered, effective attenuation of micro-vibration of full-frequency bands including ultralow frequency can be achieved, the problem of vibration caused by uncertain stimulation of precision machining is solved, and meanwhile, the volume and the quality of the vibration isolator are reduced.

A travel control device for vehicle (10) includes a steering transmission ratio variable device (14), a steering transmission ratio control device (16) configured to carry out such control that an actual relative rotational angle (θre) of the steering transmission ratio variable device reaches a target value (θret), a power steering device (18), a steering assist torque control device (20) configured to control the power steering device, and a driving support device (22) configured to correct a target steering assist torque so that an actual steering angle of steered wheels (19FL, 19FR) reaches a target steering angle for driving support. When the driving support device is in operation (Step 140), the magnitude of a change in a relative rotational angle generated by the control of the steering transmission ratio variable device is decreased (Step 150 to 200) compared to a case in which the driving support device is not in operation.

The invention provides a composite vibration damper for a control moment gyro. The composite vibration damper comprises a dynamic vibration absorber and a metal rubber vibration isolator, wherein the dynamic vibration absorber comprises a fastening counterweight (1), a first metal rubber unit (3), a shell (4) and shell fastening bolts; and the metal rubber vibration isolator comprises a sleeve (10), a second metal rubber unit (11), a third metal rubber unit (11) and a fourth metal rubber unit (12). According to the composite vibration damper provided by the invention, the dynamic vibration absorber is mounted on a weight reducing groove of a frame rotor system and the metal rubber vibration isolator is mounted on an engine base of the control moment gyro, thereby overcoming the defects that the vibration of the frame rotor system cannot be damped by a whole machine vibration isolating platform, and the gravity center of a whole machine rises because the control moment gyro is mounted on the whole machine vibration isolating platform. The composite vibration damper has the advantages of being light in weight, small in size and simple in structure.

The invention discloses a linear vibration motor which comprises a stator assembly, a vibrator assembly and an elastic supporting part, wherein the stator assembly comprises a shell with an accommodating cavity and a magnet positioned in the accommodating cavity and combined and fixed with the shell; the magnet comprises a hollow part; the vibrator assembly comprises a coil arranged on a concentrating flux plate and mass blocks surrounding the periphery of the coil; the hollow part extends along a vibrating direction of the vibrator assembly; when the vibrator assembly vibrates, the coil vibrates along with the vibrator assembly and is inserted into the hollow part of the magnet; the elastic supporting part is configured to suspend the vibrator assembly in the accommodating cavity of the shell; and the concentrating flux plate further comprises a through hole which corresponds to an inner cavity of the coil and runs through the upper surface and the lower surface of the concentrating flux plate. According to the linear vibration motor provided by the invention, the structure can utilize magnetism of the magnet to the greatest extent; utilization efficiency of the coil for magnetic force lines of the magnet is promoted; an electromagnetic driving force of the motor is promoted; and the assembling process is simple and convenient, and assembling accuracy is high, so that the motor can obtain better vibration performance.

The invention discloses a micro-vibration sensitive type high-damping composite and a preparation method thereof. The high-damping composite is formed by compounding a lithium lanthanum zirconium alkoxy ceramic material of a garnet-like structure and pure copper or copper alloy. By means of the high-damping composite adopting a powder metallurgic method or liquid melting method, the mechanical property of a ceramic base can be greatly improved through the beneficial effect that the high-damping composite has high damping performance under excellent room temperature micro-vibration environment and does not depend on strain amplitude and the beneficial effect that the good mechanical property is achieved after the high-damping composite is compounded with copper or copper alloy, and therefore the requirement of high-damping materials is met well.

A modularizing structure carriage with damping filling material, which is used in the load-bearing platform carriage of the high precision process equipment and checkout equipment, which is filling the damping material into the tubular support component in order to decrease the weight of every support component and provide the sufficient damping effect, link every support component by the modularizing mode that becomes to the high rigidity platform carriage for support and load. The invention can be used in the high rigidity isolative platform of the overhead floor by the high rigidity structure after combine every support component, is not only decreases the tiny vibration on the horizontal direction effectively but also reduces the weight of the carriage body.

The invention discloses a movable 30-degree reflector device, which comprises a base, a movable total reflector, a total reflector outer frame for fixing the movable total reflector, a light baffle plate, a control circuit board, a 30-degree rotary part, a mechanical arm and a guide rail, wherein the 30-degree rotary part is arranged on a rear panel of the base and is arranged at the upper right end of the base; the guide rail is arranged on the left of the base and in a guide rail groove extending longitudinally; when the device receives a signal, a high precision polished reflector, namely the movable total reflector is indirectly driven to move along the guide rail vertically, and the requirement for flexibly changing optical path output is met; and moreover, the stability of the device is greatly improved through the guide rail, and the damage of optical fibers caused by vibration when laser is reflected is reduced. The movable 30-degree reflector device has high portability, can be matched with the conventional single path laser to be improved to multipath output, and is easy and convenient to operate.

A static pressured air-float guide rail based on bilateral symmetric damping belongs to the technical field of the precision instrument and measurement. In view of the characteristics of small driving force and large inertia of the air-float guide rail, and according to the properties of step response and shock response of a closed loop control system of the guide rail, a two-way viscous damper is introduced to the system to constitute a part for rate feedback, so that the shortage of damping effect of a differential parameter in a PID controller is relieved, thus increasing the damping ratio of the system, reducing movement over-control, and eliminating proper vibrations caused by random disturbance. Two viscous dampers with the same parameter are symmetrically arranged at the two ends of an air-float cover to form a two-way viscous damper; the intensity of the damping force is proportional to the speed of the air-float cover; the direction of the damping force is aligned with the movement direction of the air-float cover; and the damping coefficient is accurate and adjustable, so that the movement over-control of the guide rail and the proper vibration in the movement direction after positioning are reduced, and the positioning precision and static stability of the guide rail are increased by about one order of magnitude.

The invention provides virtual reality equipment. A frame comprises a rear frame surface and a front frame surface along a direction which is vertical to a rear shell bottom surface. A connection position of the front frame surface and the rear frame surface forms a ridge-shaped structure. Through the ridge-shaped structure, the frame of the virtual reality equipment forms a stable structure possessing a triangular form. When the virtual reality equipment is under an external force effect, because of the ridge-shaped structure, a force direction and the rear frame surface of the ridge-shaped structure and the force direction and the front frame surface form included angles which are less than 90 degree so that the force can be dispersed and conducted towards two sides of the virtual reality equipment along the rear frame surface and the front frame surface. A condition that the force borne by the frame can not be dispersed so that a local stress is too large and the frame is damaged can be avoided. Because of the ridge-shaped structure, the frame of the virtual reality equipment forms a stable structure possessing the triangular form. A breakage condition caused by large deformation is not generated and stability of 3D imaging is increased. By using the virtual reality equipment, the virtual reality equipment possesses a light and thin form and simultaneously high shell intensity is possessed.

The invention relates to the technical field of vibration and noise control, and discloses a three-dimensional vibration isolation device for rail transit, which comprises an upper connecting plate, a vertical vibration isolation unit, a middle working plate, a horizontal vibration isolation unit and a lower connecting plate sequentially arranged from top to bottom, wherein the vertical vibration isolation unit comprises a box body, a first rubber layer, a spacing plate and a second rubber layer, the first rubber layer, the spacing plate and the second rubber layer are sequentially and fixedly connected in the box body from top to bottom, an opening is formed in one end of the box body, the upper connecting plate is fixed to the opening in a covering mode, and a plurality of vibration isolation springs are fixedly arranged on the first rubber layer and the second rubber layer. And the plurality of vibration isolation springs are coaxially arranged on the first rubber layer or the second rubber layer. Micro vibration induced by rail transit can be effectively reduced, the problem of vibration noise of the upper cover structure of the rail transit can be effectively solved, and a good vibration isolation effect can be achieved for multiple types of vibration sources and horizontal and vertical multi-dimensional vibration input.

The six-degree-of-freedom micro-vibration suppression platform of the present invention includes a base platform, a load platform, six identical sets of single-degree-of-freedom active-passive composite vibration isolation devices and controllers, and the upper and lower ends of each single-degree-of-freedom active-passive composite vibration isolation device Connect with load platform and base platform respectively. The control method of the present invention includes the steps of calculating the logic axis signal, calculating the logic axis control signal, calculating the real-time control signal of the physical axis and transmitting. The present invention has simple structure and adjustable stiffness, can suppress and isolate six-degree-of-freedom micro-vibrations in the translational direction and rotational direction of the X-axis, Y-axis, and Z-axis, can be suitable for different occasions, and can effectively attenuate vibrations in different frequency bands. Micro-vibration provides a reliable guarantee for precision machining and measuring equipment in a micro-vibration environment, solves the problems of complex structure and cumbersome control methods in existing active-passive composite vibration isolation mechanisms, and realizes multi-degree-of-freedom vibration suppression.

The invention relates to the technical field of roller bearings, and discloses a magnetofluid cylindrical roller thrust bearing. The magnetofluid cylindrical roller thrust bearing comprises a bearing,a roller retainer, a bezel and a static rack from top to bottom in sequence, and rollers are arranged in the middle of the roller retainer in sequence; the roller retainer and the rollers are all arranged in an annular rolling passage at the upper portion of the bezel together, magnetofluid is injected into the annular rolling passage of the bezel, and an annular gasket and an annular axial permanent magnet are arranged inside an annular groove in the lower portion of the bezel. The invention further discloses a processing technology of the magnetofluid cylindrical roller thrust bearing. According to the magnetofluid cylindrical roller thrust bearing and the processing technology thereof, the magnetofluid is adopted as a thrust bearing lubricant, the bearing running requirements for low friction, micro-vibration and high bearing capacity can be met, the bezel is provided with the annular rolling passage serving as the system for lubrication of the magnetofluid and the rollers, and thepermanent magnet is adopted as an external magnetic field applying source and arranged at the lower portion of the magnetofluid. The magnetofluid cylindrical roller thrust bearing is reasonable in structural design, and particularly suitable for precise instruments with strict operation conditions.

The invention relates to a high-performance computerized flat knitter compound needle, in particular to a completely-forming computerized flat knitter compound needle. The completely-forming computerized flat knitter compound needle comprises a needle rod and a needle core. The needle rod sequentially comprises a needle hook, a connecting part and a needle tail which are integrated. A guide groove is formed in the needle tail. The needle rod is connected with a bottom needle through the guide groove. The needle core sequentially comprises a stitch transfer part, a slide part and a core body. A needle butt is disposed at the tail of the core body. A U-shaped groove is formed in the core body between the needle butt and the slide part. The needle rod and the needle core are mounted in a compound manner. The slide part is nested into the connecting part. The needle core can slide in the connecting part of the needle rod through the slide part. The needle hook is located at one end of the stitch transfer part. The needle tail is located at the needle butt end. The compound needle meeting completely-forming knitting process requirements is simple in structural design, stable in operation, and the like.

A travel control device for vehicle (10) includes a steering transmission ratio variable device (14), a steering transmission ratio control device (16) configured to carry out such control that an actual relative rotational angle (θre) of the steering transmission ratio variable device reaches a target value (θret), a power steering device (18), a steering assist torque control device (20) configured to control the power steering device, and a driving support device (22) configured to correct a target steering assist torque so that an actual steering angle of steered wheels (19FL, 19FR) reaches a target steering angle for driving support. When the driving support device is in operation (Step 140), the magnitude of a change in a relative rotational angle generated by the control of the steering transmission ratio variable device is decreased (Step 150 to 200) compared to a case in which the driving support device is not in operation.

The invention relates to the technical field of roller bearings, and discloses a magnetic fluid thrust cylindrical roller bearing, which comprises a shaft ring, a roller cage, a seat ring and a stationary frame from top to bottom, and the middle part of the roller cage is sequentially The rollers are arranged, and the roller cage and the rollers are arranged in the annular raceway above the seat ring, and the magnetic fluid is injected into the annular raceway of the seat ring, and the annular groove below the seat ring is provided with an annular gasket and an annular ring. Axial permanent magnet; its processing technology is also disclosed. In the present invention, the magnetic fluid is used as the thrust bearing lubricant, which can realize the bearing operation requirements of low friction, micro-vibration and high bearing capacity, and the seat ring is set as an annular raceway for the magnetic fluid and roller lubrication system, and the permanent The magnet is set at the lower part of the magnetic fluid as an external magnetic field application source, and the structure design is reasonable, which is especially suitable for precision instruments with strict operating conditions.

The invention discloses a small hole throttling static pressure thrust gas bearing with accompanying throttling holes, and relates to gas bearings. An air inlet cavity of the bearing is formed in the normal direction of a thrust surface of a bearing body. A main throttling hole and the multiple accompanying throttling holes are connected to the tail end of the air inlet cavity, and the main throttling hole is parallel to the axis of the air inlet cavity. The axes of the accompanying throttling holes are circumferentially and uniformly distributed on the circumference which is away from the axis of the main throttling hole by a distance R. The axes of the accompanying throttling holes are parallel to the axis of the main throttling hole. A pressure cavity vertically communicates with the tail ends of the main throttling hole and the tail ends of the accompanying throttling holes, and the pressure cavity and the main throttling hole are coaxial. The flow of the main throttling hole vertically impacts on the bearing surface to provide main bearing force, along with generation of a large-scale vortex structure in the pressure cavity, the flow of the accompanying throttling holes around the main throttling hole vertically rushes into the pressure cavity, the vortex structure is damaged, the vortex scale is reduced, vortex development is restrained, the internal and external pressure difference of vortexes is reduced, and micro-vibration of the bearing is reduced. The working stability of the bearing is improved.

The invention discloses a movable 30-degree reflector device, which comprises a base, a movable total reflector, a total reflector outer frame for fixing the movable total reflector, a light baffle plate, a control circuit board, a 30-degree rotary part, a mechanical arm and a guide rail, wherein the 30-degree rotary part is arranged on a rear panel of the base and is arranged at the upper right end of the base; the guide rail is arranged on the left of the base and in a guide rail groove extending longitudinally; when the device receives a signal, a high precision polished reflector, namely the movable total reflector is indirectly driven to move along the guide rail vertically, and the requirement for flexibly changing optical path output is met; and moreover, the stability of the device is greatly improved through the guide rail, and the damage of optical fibers caused by vibration when laser is reflected is reduced. The movable 30-degree reflector device has high portability, can be matched with the conventional single path laser to be improved to multipath output, and is easy and convenient to operate.

The invention discloses a solar wing layout structure of a high-precision spacecraft. A top solar wing main plate and top solar wing side plates form a top solar wing which is fixedly installed on a platform top plate through bolts; an included angle between the top solar wing main plate and each top solar wing side plate is 120 degrees; the section of a spacecraft platform is in the shape of a regular hexagon, the top solar wing main plate is rectangular, each top solar wing side plate is triangular, and a bottom solar wing is installed at the bottom of a platform bottom plate; top solar wing honeycomb sandwich embedded parts are pre-embedded in the top solar wing main plate and the top solar wing side plates, and platform top plate honeycomb sandwich embedded parts are pre-embedded in the platform top plate; and a top solar wing pressing rod is installed among the top solar wing main plate, the top solar wing side plates and a payload. The solar wing layout structure disclosed by the invention can effectively improve the connection stiffness between the solar wing and the spacecraft platform so as to reduce the micro-vibration of the solar wing and improve the attitude stability of the spacecraft platform, and has the advantages of simple configuration, convenient connection and obvious effect.

The invention discloses an anti-sway vibration isolating device for reducing micro-vibration of a flywheel, and belongs to the technical field of aerospace equipment. The anti-sway vibration isolatingdevice is provided with a satellite capsule plate, and the upper portion of the satellite capsule plate is fixedly connected with a mounting bracket provided with the flywheel through the vibration isolating device; the vibration isolating device comprises a gasket, a vibration isolating pad and a shaft sleeve, the gasket is in contact with the upper end of the shaft sleeve, the lower end of theshaft sleeve is in contact with the upper surface of the satellite capsule plate, the exterior of the shaft sleeve is sleeved with the vibration isolating pad for absorbing vibration shock, and the vibration isolating pad and the mounting bracket are in flexible contact; and an anti-sway device comprises a sleeve and an anti-sway bar, the outer wall of the sleeve is fixedly connected with the mounting bracket, the inner wall of the sleeve is arranged outside the anti-sway bar in a sleeving manner, an overlapping area of one end of the anti-sway bar and the sleeve is fixedly connected with an energy sucking sleeve, the energy sucking sleeve is in clearance fit with the sleeve, and the other end of the anti-sway bar is fixedly connected with the satellite capsule plate through bolts. The anti-sway vibration isolating device reduces micro-vibration and swing of the flywheel and is simple in structure and light in weight.

The invention provides a vibration isolation device suitable for a satellite control moment gyro, the vibration isolation device comprises a lower mounting plate, an upper mounting plate and a vibration isolation assembly, the vibration isolation assembly comprises a first vibration isolator array and a second vibration isolator array, and the first vibration isolator array is mounted between the lower mounting plate and the upper mounting plate. The second vibration isolator array is mounted on the upper mounting plate, each of the first vibration isolator array and the second vibration isolator array comprises four vibration isolators, and the four vibration isolators are arranged in parallel. According to the invention, the coupling characteristic is designed by considering the mounting requirement of the control moment gyroscope from the actual vibration reduction requirement; The installed vibration isolation assembly is symmetrically and coplanarly arranged, so that the planeness requirement of the control moment gyroscope during installation is ensured, the rigidity center passes through the mass center of the control moment gyroscope, good decoupling characteristics in all directions are achieved, the multi-direction vibration isolation effect is achieved, and more stable and more excellent performance is obtained.

The invention relates to a vibration absorption device suitable for a satellite platform and a using method, and the vibration absorption device suitable for the satellite platform comprises a base which is connected to the satellite platform, and the satellite platform is provided with vibration equipment and a sensitive load. A plurality of groups of vibration absorption assemblies are arranged on the base, each group of vibration absorption assembly comprises a mounting rod connected to the base and a mass block assembled on the mounting rod in an exchangeable manner, and the mounting position of the mass block on the mounting rod is adjustable. A mass spring damping system can be formed through the mounting rod and the mass block assembled on the mounting rod, the inherent frequency of the vibration absorption assemblies can be adjusted through the replaceable mass block and the adjustable position of the replaceable mass block on the mounting rod, and resonance of vibrations caused by the vibration absorption assemblies and vibration equipment is facilitated. Therefore, vibration energy generated by the vibration equipment is transferred to the vibration absorption assemblies in a mode that the base is connected with the satellite platform, so that the micro-vibration effect of the system is reduced.

A damper device includes a first rotor, a second rotor, an elastic coupling part having first and second elastic members, and a hysteresis generating mechanism. The hysteresis generating mechanism includes a friction member, and generates a hysteresis torque. The friction member does not make frictional contact with the first and second rotors in a first torsion angular range where the torsion is caused between the first and second rotors by a first torsion angle from a neutral condition, makes frictional contact with the first or second rotor in a second torsion angular range exceeding the first torsion angle so as to generate the hysteresis torque, and does not make frictional contact with the first and second rotors in a predetermined torsion angular range within the second torsion angular range. In the neutral condition, the friction member is set in a neutral position by actuation of the elastic coupling part.

The invention proposes a smart vibration isolator for micro-vibration control. The smart vibration isolator for micro-vibration control comprises a housing 1, a magnetorheological elastomer 2, a force output rod 3, a sliding bearing 4, a cover board 5, a magnetic mass block 6, a piezoelectric ceramic pile 7, a pressing bolt 8, a connection base 9, a steel ball 10 and a coil 11. The smart vibration isolator adopts a cascade form of the magnetorheological elastomer and the piezoelectric ceramic pile, selects working states of the piezoelectric ceramic pile and the magnetorheological elastomer by switching control according to the excitation frequency, and achieves semi-active / full-active two-stage vibration isolation of vibration. By adopting the smart vibration isolator for micro-vibration control, the advantages of the stability, the controllability, good dynamic characteristics and large output force of the piezoelectric ceramic pile vibration isolator are considered, effective attenuation of micro-vibration of full-frequency bands including ultralow frequency can be achieved, the problem of vibration caused by uncertain stimulation of precision machining is solved, and meanwhile, the volume and the quality of the vibration isolator are reduced.

The invention provides a portable electric seismic source device for shallow seismic exploration, which comprises a chassis base, a support frame, a storage battery, an energy storage spring, a heavy hammer assembly and a driving assembly, and is characterized in that the support frame is fixed in the middle of the chassis base, and the heavy hammer assembly and the driving assembly are arranged on the support frame; the supporting frame comprises a plurality of stand columns and cross beams, the heavy hammer assembly comprises an upper connecting plate and a hammering rod, the hammering rod is sleeved with the upper connecting plate, stand column holes of the upper connecting plate are connected with the stand columns in a penetrating mode, and the stand columns are connected with the hammering rod in a sliding mode; an energy storage spring is arranged between the upper connecting plate and the cross beam; a motor in the driving assembly is in transmission connection with the input end of a speed reducer through a driving shaft, the driving shaft is arranged in a driving shaft barrel in a penetrating mode, the driving shaft barrel is in transmission connection with the output end of the speed reducer, a driving wheel arranged outside the driving shaft barrel is in transmission connection with a driven wheel arranged outside a driven shaft through a chain, and a stop pin of the chain can abut against a clamping block on the side portion of a hammering rod. The invention has the advantages of large impact energy, flexible control, high signal-to-noise ratio and various triggering styles.

The invention discloses a vibration-proof worktable for adjusting the levelness of a microscope and a mounting method. The worktable comprises a supporting bottom plate and at least three damping supporting units; the damping supporting units are disposed on the lower surface by first mounting holes arranged on the supporting bottom plate, the lower surface is opposite to the upper surface of the supporting bottom plate, each damping supporting unit comprises a spring system and a central shaft, each spring system comprises an upper cover plate, a lower cover plate and a connecting spring, a second mounting hole is arranged in the center of each upper cover plate, an accommodating groove is arranged in the center of each lower cover plate, and each connecting spring is disposed between the corresponding upper cover plate and the corresponding lower cover plate; and each central shaft is arranged in the corresponding spring system, one end of the central shaft is respectively connected with the second mounting hole of the corresponding upper cover plate and the corresponding first mounting hole of the supporting bottom plate in a threaded manner, the other end of the central shaft extends into the accommodating groove of the corresponding lower cover plate, and the other end of the central shaft can axially slide in the corresponding accommodating groove without being in direct contact with the bottom surface of the accommodating groove. By the vibration-proof worktable, the levelness of the microscope is obviously improved, and vibration is reduced.