47results about How to "Suppress high frequency vibration" patented technology

A four-degree-of-freedom serial-parallel hybrid posture alignment vibration-isolation platform provided with triangular branches mainly comprises a base, a movable platform, three linear drive units, the three triangular branches, a rotary plate bearing and a rotary plate. Each linear drive unit is composed of an installing block, a linear module and an assistance part, wherein the installing block is fixedly connected to the base, the linear module is installed on the installing block, one end of the assistance part is connected with a baffle at the end of the linear module, and the other end of the assistance part is connected with a slider of the linear module. Each triangular branch comprises a first ball joint base, a first ball joint, a vibration isolator, a two-ball-joint triangular frame and two second ball joint bases, wherein the first ball joint base is installed on the slider of the corresponding linear module, one end of the vibration isolator is connected to the first ball joint, the other end of the vibration isolator is connected with the two-ball-joint triangular frame, and the two ball joint bases are connected to the movable platform. An outer ring of the rotary plate bearing is installed on the movable platform, and the rotary plate is installed on an inner ring of the rotary plate bearing. The four-degree-of-freedom serial-parallel hybrid posture alignment vibration-isolation platform is large in stiffness and good in vibration isolation effect and dynamic performance.

The invention relates to a lithographic apparatus including a support frame which is supported by a base via a vibration isolation system; a projection system arranged to transfer a pattern from a patterning device onto a substrate, wherein the projection system includes a first frame which is spring-supported by the support frame; and an active damping system configured to damp movement of the first frame, including: a first sensor system configured to provide a first sensor output representative of absolute movement of the first frame, a first actuator system arranged to apply a force between the first frame and the support frame, and a control system configured to provide a drive signal to the first actuator system based on the first sensor output.

A six-degree-of-freedom parallel stabilizing and vibration-isolating cabin mainly comprises a base, six vibration-isolating branches, assisting bearing branches, a cabin body and six linear driving units fixedly connected onto the cabin body, wherein each of the six vibration-isolating branches comprises a spherical hinge, a first connecting rod, a vibration isolator, a second connecting rod and a universal hinge, one end of the first connecting rod is connected with the base by the aid of the spherical hinge, the other end of the connecting rod is connected with one end of the vibration isolator, the other end of the vibration isolator is connected with one end of the second connecting rod, and the other end of the second connecting rod is connected with one end of a moving rod of each of the six linear driving units by the aid of the universal hinge; the cabin body adopts a hexagonal prism structure, every two linear driving units form a group, driving directions are parallel, and the six linear driving units are uniformly and fixedly connected onto spaced side surfaces of the hexagonal prism; each of the assisting bearing branches comprises spherical hinges and an assisting part, and two ends of the branch are connected with the bottom of the cabin and the base by the aid of the spherical hinges. The six-degree-of-freedom parallel stabilizing and vibration-isolating cabin is low in overall height and high in bearing capacity and has very good stabilizing and vibration-isolating effects.

The invention provides an aerial photography damping damper and relates to a damper. The problems that a damping ball utilized for an existing aircraft aerial photography damping mechanism is poor in load bearing capability and mechanical strength and potential safety hazards occur are solved. The damper comprises a viscous-elastic material filling layer, a damper upper shell plate, a damper lower shell plate, a fixed part and a buffer spring. The damper upper shell plate and the damper lower shell plate are fixedly connected through the fixed part, and a gap is formed between the outer side wall of the damper upper shell plate and the inner side wall of the damper lower shell plate. The gap is filled with the viscous-elastic material filling layer, the fixed part penetrates the damper upper shell plate and the center of the damper lower shell plate, the buffer spring sleeves the fixed part, the two ends of the buffer spring are fixed on the damper upper shell plate and the damper lower shell plate respectively, and the free length of the buffer spring is larger than the interval between the damper upper shell plate and the damper lower shell plate. The aerial photography damping damper is used for damping an aerial photography aircraft.

The invention relates to the technical field of electric vehicle parts and discloses a two-stage vibration reduction mount device for an electric vehicle. The two-stage vibration reduction mount device comprises a hollow cylindrical outer framework with a bottom surface, wherein a mounting and connecting bracket is arranged at the outer side wall of the outer framework; vibration reduction rubberbushings are sheathed and connected in the inner cavity of the outer framework; the vibration reduction rubber bushings comprise a first-stage vibration reduction rubber bushing and a second-stage vibration reduction rubber bushing; the second-stage vibration reduction rubber bushing is in the shape of a cylinder which cooperates with the inner cavity of the outer framework; the second-stage vibration reduction rubber bushing is provided with an insertion hole penetrating through the upper end surface and the lower end surface; the second-stage vibration reduction rubber bushing is also provided with a ring-shaped insertion ring penetrating through the upper end surface and the lower end surface; the first-stage vibration reduction rubber bushing is in inserted connection with the second-stage vibration reduction rubber bushing through the insertion ring; the insertion hole is arranged inside the insertion ring; a connecting bracket is inserted and connected in the insertion hole; andone end of the connecting bracket is connected to a powertrain. The two-stage vibration reduction mount device for the electric vehicle is provided with a plurality of vibration reduction inner bushings and has the advantages of isolating low-frequency vibration, isolating high-frequency vibration and realizing a good use and experience effect.

A main shaft device is provided. The main shaft device is provided with a shell (10), a main shaft (20) provided with a main body part (61) holding the cylinder shape of a rotating tool (21) and a flange part (63) protruding from the periphery of the rotating tool (21) of the main body part (61) towards the radical outside, bearings (81-85) bearing the periphery of the main body part (61) to be rotatable relative to the shell (10), and a viscoelastic bearing (hydrostatic bearing (70)) supporting the flange part (63) to allow the flange part to be rotatable relative to the shell (10), arranged at the radical positions of the bearings (81-85) or outside the radical positions and having an attenuation coefficient greater than the attenuation coefficients of the bearings (81-85).

An objective of the present invention is to provide a cutting insert (1) which is suitable for 90° shoulder cutting. A cutting insert (1) comprises: two first and second end faces (2, 3); a circumference side face (4) which extends therebetween; and a cutting blade (6) which is formed at an intersection ridgeline part of the first end face and the circumference side face. The cutting blade (6) is formed such that the first end face (2) functions as a rake face and a portion of the circumference side face (4) functions as a flank face. Side face parts (15) of the circumference side face, which are adjacent to at least a portion the cutting blade (6), comprise, in order from the first end face side toward the second end face side, a first flank face part (18) which is adjacent to the cutting blade, a second flank face part (19), a third flank face part (20), and a fourth flank face part (21).

The invention relates to a tension leg type floating fan foundation and a floating fan. The tension leg type floating fan foundation comprises a main floating body structure, a plurality of truss girder structures and mooring mechanisms connected to the free ends of the truss girder structures, wherein the mooring mechanism is used for being connected with a seabed foundation, a plurality of mounting surfaces and a plurality of resistance increasing surfaces are alternately distributed on the outer peripheral surface of the main floating body structure, the truss girder structures are mountedon the mounting surfaces in a one-to-one correspondence manner, and the resistance increasing surfaces are concave curved surfaces; a balance weight cabin and an adjusting cabin are arranged in the main floating body structure, the balance weight cabin is filled with a balance weight material, and the adjusting cabin is adjustably filled with an adjusting liquid used for controlling the draught depth of the main floating body structure; and the main floating body structure is further provided with damping plates protruding out of the resistance increasing surfaces. By the adoption of the tension leg type floating fan foundation and the floating fan, the attached water mass and hydrodynamic damping are increased, the self-stability of the main floating body structure is enhanced, and high-frequency vibration of the main floating body structure is restrained.

The invention discloses a damper type floating slab track. The damper type floating slab track comprises a shear hinge for connecting a track slab with another track slab, and a spring-viscous damperassembly which is arranged below a steel rail, is arranged in a floating slab and is used for reducing vibration. The damper type floating slab track has the advantages that the spring-viscous damperreplaces a traditional steel spring to serve as a vibration isolation element, parameters of the elastic element are reasonably matched, high-frequency vibration is effectively restrained, low-frequency resonance energy of the track slabs is absorbed, the defect that a steel spring floating plate track restrains low-frequency vibration is overcome, and the vibration isolation frequency range of the floating slab track is expanded; and the damper assembly is convenient to mount, dismount and overhaul and maintain in the later period; and the damper converts kinetic energy to thermal energy fordissipation, is simple in structure and stable in motion when doing reciprocating motion.

The invention discloses a low-noise range hood, which comprises a volute, wherein an impeller is arranged inside the volute, a first annular air duct is arranged at the bottom of the volute, and a second annular air duct is arranged above the first annular air duct; a plurality of first partition plates are arranged in the first annular air duct, a spheroidal air bag is movably connected between the two adjacent first partition plates, a plurality of first through holes are evenly formed in the first partition plates, a second partition plate is arranged at the air inlet of the first annular air duct, a plurality of second through holes are evenly formed in the second partition plate, and a first air deflector is obliquely arranged between the second partition plate and the first partition plate adjacent to the second partition plate; a third partition plate is arranged at the air inlet of the second annular air duct, a third through hole is formed in the third partition plate and is communicated with an air inlet end of a cavity, and an air outlet end of the cavity is communicated with the second annular air duct. According to the low-noise range hood, the deficiencies of the prior art can be improved, and the efficient noise reduction at different air volumes can be realized.

The invention discloses a structure and method for weakening vibration of an operating mechanism by means of axial nonlinear transmission of waves. An axially symmetric connector provided with an axial zigzag structure and made of a damping material is adopted, and the connector has the function of weakening influences of vibration caused by the operating mechanism of a circuit breaker and propagation of vibration energy. The propagation path of vibration waves is changed due to the axially symmetric connector which is provided with an axial zigzag structure made of the damping material and arranged on the propagation path of the vibration waves in the operating mechanism, so that the propagation path of the propagated vibration waves is both axial and radial. The zigzag structure further weakens vibration intensity and absorbs the vibration energy by increasing refraction and reflection of the vibration waves. Besides, the damping material and the zigzag structure of the axially symmetric connector are combined in use, so that the propagation path of the vibration waves is lengthened, and the damping material consumes more energy of the vibration waves.

The invention discloses a vibration isolation assembly based on a high-frequency high-damping vibration isolation disc-shaped gasket. The vibration isolation assembly comprises a bolt and a nut, and further comprises two damping alloy discs, a flat gasket, an upper simulation assembly and a lower simulation assembly which are arranged on the bolt in a sleeving mode, the two damping alloy discs areinstalled between the upper simulation assembly and the lower simulation assembly, the flat gasket is installed between the two damping alloy discs, the nut is screwed on the bolt from the outermostside, each damping alloy disc comprises an inner edge and an outer edge, the inner edges protrude in the axial direction relative to the outer edges, so that the whole damping alloy discs are in a circular truncated cone shape, a plurality of tooth protrusions are arranged on the inner edges in the circumferential direction, and the tooth protrusions of the two damping alloy discs are symmetrically arranged. According to the vibration isolation assembly, a transmission vibration isolation structure can be replaced, non-specific external high-frequency vibration is restrained and isolated, thecost is reduced, the space occupation requirement is reduced, the light weight degree of a vehicle is improved, and the control comfort is improved.

The invention relates to a servo control method for a parallel redundant flexible cable mechanism based on a hyper-ellipsoid mapping analytical algorithm. The servo control method comprises the stepsthat the parallel redundant flexible cable mechanism feeds back a control pseudo instruction and parses and distributes the pseudo instruction; the feedback control pseudo instruction is realized through PID control; and a pseudo instruction analysis and distribution method is realized through a hyper-ellipsoid mapping method. The problem that an existing parallel redundant flexible cable mechanism servo control system needs to be optimized on line is solved, the feedback control rate is composed of simple matrix operation, the structure is simple, implementation is easy, and the on-line solving efficiency is high.

The invention discloses an end milling cutter which comprises a cutting portion and a handle portion. The end milling cutter is characterized in that a spiral cutting edge is arranged on the cutting portion which is of a curved-surface structure, and an edge portion of the cutting edge is of an unequal helical angle structure; the cutting portion is coated with titanium aluminum oxide. The curved-surface cutting edge and the unequal helical angle structure which can prevent a machining height difference of a vertical surface are adopted, the high-frequency vibration can be effectively inhibited, and the stability of the end milling cutter during machining is improved; an annular clamping groove is formed in the middle of the handle portion so that a chuck can clamp the cutter conveniently and firmly, and the chuck is unlikely to loose; the outer diameter of the handle portion is smaller than that of the cutting portion, materials are reduced and the manufacturing cost of the milling cutter is reduced.

The invention relates to the technical field of hydraulic shock absorbers, in particular to an auxiliary valve of a rebuilt valve and a hydraulic shock absorber. The auxiliary valve of the rebuilt valve comprises a fixing ring, a sliding ring and an elastic piece. The fixing ring and the elastic piece sequentially sleeve a piston rod and are connected with the piston rod in a positioning mode, the sliding ring sleeves the fixing ring and makes friction contact with the fixing ring, the two ends of the sliding ring abut against a main valve plate of the rebuilt valve and the elastic piece correspondingly, and the elastic piece can elastically deform. When the main valve plate of the rebuilt valve is opened and vibrates due to the high-frequency vibration input, the main valve plate pushes the sliding ring to move, the elastic piece elastically deforms under the action of the sliding ring, the resilience force of the elastic piece reacts on the sliding ring and reversely pushes the sliding ring to move, the friction force can be generated between the sliding ring and the fixing ring in the moving process of the sliding ring, movement of the sliding ring is restrained, and therefore the vibration of the main valve plate is restrained, the acceleration of the piston rod is reduced, the vibration transmitted to a vehicle body by the piston rod is reduced, and the riding comfort of a vehicle is improved.