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

The invention discloses a six-degree-of-freedom micro vibration abatement platform. The six-degree-of-freedom micro vibration abatement platform comprises a foundation platform, a load platform, six sets of totally identical single-degree-of-freedom active / passive composite vibration insulating devices, and a controller; and the upper and lower two ends of each set of single-degree-of-freedom active / passive composite vibration insulating devices are respectively connected with the foundation platform and the load platform. A control method comprises logic shaft signal calculation, logic shaft control signal calculation, physical shaft real-time control signal calculation and transfer steps. The six-degree-of-freedom micro vibration abatement platform is simple in structure and adjustable in rigidity, can inhibit and isolate six-degree-of-freedom micro vibration in translation and rotation directions of axles X, Y and Z, can be suitable for different places, can effectively attenuate micro vibration on different frequency bands, provides reliable guarantee to precise machining and measuring equipment under micro vibration environments, solves the problems of complex structure and complex control mode in a traditional active / passive composite vibration insulating mechanism, and realizes multi-degree-of-freedom vibration inhibition.

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 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 present invention provides a gearless drive mechanism, facilitating the connection between an output shaft of a continuously variable transmission and a rotating shaft of a driven body, and transmitting the rotating speed of the output shaft to the rotating shaft of the driven body with good accuracy. The gearless drive mechanism includes: an input shaft 4 rotating on receiving the driving force; an output shaft 5, one end of which is connected to the input shaft through a variable speed mechanism, the other end being projected from a casing; a first gear 42 disposed outside the casing 3 to be spline-coupled to the projecting part of the output shaft 5 and rotated in a body with the output shaft 5; and a second gear 44 rotatablely supported on the casing 3 through a support shaft 43 to mesh with the first gear 42.

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 discloses an electromagnetic type positive and negative stiffness parallel low-frequency vibration isolation device. The device comprises a foundation platform, an electromagnetic suspension platform, a plurality of supports, center type negative stiffness mechanisms and an external power supply, wherein the electromagnetic suspension platform is fixedly connected with the foundationplatform, the plurality of supports are uniformly distributed along the axial direction of the electromagnetic suspension platform and are fixedly connected with the foundation platform, one center type negative stiffness mechanism is arranged between the electromagnetic suspension platform and each support, and the electromagnetic suspension platform is electrically connected with the external power supply. The device is simple in structure, on-line adjustable in rigidity, free of friction, low in system damping, capable of achieving low inherent frequency and inhibiting and isolating microvibration in the vertical direction, suitable for different cases, capable of effectively attenuating micro vibration in a large-frequency-band range and providing reliable guarantee for precision machining and measuring equipment in a micro-vibration environment.

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.

The application discloses a small hole throttling static pressure thrust gas bearing with accompanying throttling holes, relating to the gas bearing. The air inlet chamber of the bearing is opened along the normal direction of the thrust surface of the bearing main body. The main throttling hole and multiple accompanying throttling holes are connected to the end of the intake cavity, and the main throttling hole is parallel to the axis of the intake cavity. The axis of the accompanying orifice is evenly distributed on the circumference at a distance R from the axis of the main orifice. The axis of the companion orifice is parallel to the axis of the main orifice. The pressure chamber is vertically communicated with the end of the main orifice and the accompanying orifice, and the pressure chamber is coaxial with the main orifice. The flow of the main orifice vertically impacts on the bearing surface to provide the main bearing capacity. Along with the generation of large-scale vortex structure in the pressure chamber, the flow of the accompanying orifice around the main orifice rushes into the pressure chamber vertically and destroys the vortex structure. Reduce the size of the vortex, inhibit the development of the vortex, and then reduce the pressure difference between the inside and outside of the vortex, reduce the micro-vibration of the bearing, and then improve the working stability of the bearing.