37results 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 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.

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 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 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.

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.

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 pouring type bus duct with an anti-seismic effect and a connecting method thereof.The pouring type bus duct comprises a bus duct shell and an adjusting assembly, a pouring main body is arranged in the bus duct shell, conductor connecting pieces are poured in the pouring main body, and the outer sides of the conductor connecting pieces are wrapped with insulating damping sleeves; a buffer filling plate is filled between the bus duct shell and the pouring body, an elastic buffer block is arranged in the bus duct shell, guide plate grooves are formed in the outer sides of the two ends of the bus duct shell, adjusting guide plates are connected in the guide plate grooves, adjusting grooves are formed in the adjusting guide plates, and clamping grooves are formed in the peripheries of the outer sides of the two ends of the bus duct shell. The two ends of the lower adjusting seat and the two ends of the upper adjusting seat are clamped at the connecting positions of the two bus duct shells respectively, the bus duct shells and the adjusting assemblies are fixedly connected through locking nuts, the problems that bus duct connection is not stable and the anti-seismic effect is poor due to bus duct vibration can be solved, meanwhile, the installation length of the bus duct can be adjusted, and the service life of the bus duct is prolonged. And the bus duct is convenient to install.