739results about How to "Good vibration isolation" patented technology

The invention discloses a low-frequency vibration-isolation combined sandwiched structure. The low-frequency vibration-isolation combined sandwiched structure comprises a lower uniform layer, a middle layer and an upper uniform layer sequentially from bottom to top, wherein the middle layer is of a limited two-dimension photonic crystal structure, the limited two-dimension photonic crystal structure comprises a base body and a plurality of scatters embedded into the base body, the scatters are respectively connected with the upper uniform layer and the lower uniform layer into a whole, and the lower uniform layer, the scatters and the upper uniform layer (3) are all made of rubber materials. The scatters, the upper layer and the lower layer are combined into an integrated body and are made of the same materials. The base body needs to be fixed. The low-frequency vibration-isolation combined sandwiched structure can block incident vibration along a plate and low-frequency vibration perpendicular to the plate through the designed structure, be applied to vibration control within the frequency range of hundreds of hertz, and serve as a low-frequency vibration-isolation facility of projects such as foundations and inner walls of buildings, ships and warships, and high-speed rails.

The present invention belongs to a high-pressure large-load air spring, in particular, it relates to a vibration isolator using compressed air whose pressure is greater than IMPa as elastic body. It is composed of the following several portions: rubber bag body with aramid fiber skeleton layer, cover plate, disked flange, sealing ring and filling material in the bag interior. Said invention also provides the concrete structure of above-mentioned every portion and the connection mode of all the above-mentioned portions. Said invention also provides the working principle of said high-pressure large-load air spring and its concrete operation method.

The invention relates to a spring rubber vibration-isolation hanger used for vibration reduction and noise reduction of heating ventilation pipes, which is installed on the indoor top of a building. The hanger includes a first frame, a vibration isolation pad laid on the inner wall of the first frame and tightly wrapping the abdomen of the heating ventilation pipe, and two sets of suspension vibration isolation components. The first frame includes a U-shaped pipe clip and a crossbeam located below the heating and ventilation pipe and fixedly connected to the opening end of the U-shaped pipe clip to form a closed frame structure with the U-shaped pipe clip. The suspension vibration isolation assembly includes an upper suspension rod, a spring vibration isolator and a lower suspension rod connected vertically in sequence. The invention can not only play a good role in vibration isolation and shock resistance for the whole heating and ventilation pipe, but also can play a good role in vibration isolation and noise reduction for the local air pipe, and is especially suitable for the main control room of the nuclear power plant and the film and television workstation, etc. It is suitable for occasions that have higher requirements for indoor equipment safety and acoustic environment.

The present invention belongs to the field of vehicle passive suspension vibration isolation, and relates to a positive synthesis and passive implementation method of a vehicle ISD suspension electromechanical network system. The method comprises: Step 1: determining a dynamic model of vehicle suspension vibration and a performance evaluation index thereof; Step 2: establishing a vehicle ISD suspension electromechanical network system; Step 3: according to the performance optimization target, under the positive real inequality constraints, using the improved multi-PSO algorithm to optimize thesolution of the vehicle ISD suspension electromechanical network system to obtain the corresponding impedance transfer function coefficients; Step 4: carrying out positive real synthesis on the impedance transfer function obtained from the vehicle ISD suspension electromechanical network system; and Step 5: carrying out passive implementation on the vehicle ISD suspension electromechanical network system based on the electromechanical inertia. According to the method disclosed by the present invention, the limitation of the ISD suspension structure type design method and the difficult problemthat the impedance type design method cannot implement can be effectively solved, and a new method is provided for the structure design and implementation of the suspension.

The invention discloses an annular permanent magnet low frequency vibration isolation mechanism based on a negative stiffness theory. The mechanism comprises an upper rubber sheet, an inner annular permanent magnet fixing mandrel, an upper rubber sheet upper pressing ring, an upper rubber sheet outer pressing ring, an outer annular permanent magnet, a lower rubber sheet, a lower rubber sheet inner pressing sheet, a lower rubber sheet outer pressing ring, an outer annular permanent magnet fixing sleeve and an inner annular permanent magnet, wherein the inner annular permanent magnet is magnetized axially; the outer annular permanent magnet is radially magnetized; a positive stiffness system consists of the inner annular permanent magnet and the outer annular permanent magnet; a negative stiffness system consists of the upper rubber sheet and the lower rubber sheet; and the positive stiffness system and the negative stiffness system are used in parallel to form the low frequency vibration isolation mechanism. Three or four single-degree-of-freedom vibration isolation mechanisms are used in parallel to realize three-degree-of-freedom low frequency vibration isolation. When the vibration isolation mechanism has the largest magnetic force, the stiffness of the vibration isolation mechanism approximates to zero. Without an outside air source, the vibration isolation mechanism has a prospect of being used in vacuum, has the characteristics of simple structure and low cost, is easy to process, and can be applied to the fields of optics, acoustics, biologics, semiconductor manufacturing, precise measurement and the like.

The invention discloses a differential magnetic suspension vibration isolator which comprises an upper annular E-shaped electromagnet (15), a lower annular E-shaped electromagnet (11), an upper coil winding (8), a lower coil winding (10), a displacement sensor (1), a connecting flange plate (3), an adjusting nut (4), a spring (6), a linear bearing (7) and an armature (9). The upper annular E-shaped electromagnet (15) and the lower annular E-shaped electromagnet (11) are fixed onto a shell (14) and a base (12) respectively, the upper coil winding (8) and the lower coil winding (10) are fixed onto the upper annular E-shaped electromagnet (15) and the lower annular E-shaped electromagnet (11) respectively, the displacement sensor (1) is fixed onto the shell (14) through a support (16), the connecting flange plate (3), the adjusting nut (4), the spring (6), the linear bearing (7) and the armature (9) are sequentially connected in series from top to bottom through connecting rods (5), the shell (14) is fixed onto the base (12), and a sleeve (13) is fixed into the shell and matched with a spiral groove in the inner wall of the shell to form a sealed cooling water channel. The differential magnetic suspension vibration isolator has the advantages of simple structure, small size, non-contact, long service life, rapid response and easiness in regulating electromagnetic force, and has an excellent application prospect in the field of active vibration noise control.

The invention aims to provide a rigidity-adjustable electromagnetic vibration isolator. The structure of a spring steel sheet portion is that an outer layer of spring steel sheets and an inner layer of spring steel sheets are distributed in a bilaterally symmetrical mode and are fixed between an upper fixing plate and a lower fixing plate respectively. Damping materials are filled between the laminated spring steel sheets. The structure of an electromagnet portion is that electromagnetic coils are installed on iron cores, the iron cores are fixed on the upper inner surface and the lower inner surface of an electrician pure iron mounting rack respectively, and the electrician pure iron mounting rack provided with the electromagnetic coils is fixed to the lower fixing plate of the vibration isolator through bolts. The structure of a movable permanent magnet portion is that two adjusting bolts are fixed on the upper fixing plate through nuts respectively, two protruded circular columns are arranged on the center of the upper surface and on the center of the lower surface of a permanent magnet fixing plate, two ring permanent magnets are fixed on the upper surface and the lower surface of a middle plate through the protruded circular columns, and the fixing plate provided with the permanent magnets is connected with the adjusting bolts through the adjusting nuts. According to the rigidity-adjustable electromagnetic vibration isolator, the advantage of good stability of a passive vibration isolator and the advantage of flexible application of an active vibration isolator are integrated.

There is provided a vibration isolator capable of, (1) vibration isolation performance for ground motion disturbance: vibration isolation for floor vibration, and (2) vibration control performance for direct acting disturbance: suppression of swing due to driving reaction force caused by stage movement, significantly improving the above (2), i.e., the vibration control performance, with keeping the above (1), i.e., the vibration isolation performance, at a high level.

The invention provides a railway vehicle second level vertical suspension applying an inerter and a parameter determining method thereof. The railway vehicle second level vertical suspension comprises the inerter, a damper, a main spring and an auxiliary spring, and the main spring is in parallel connection with the damper and then is in parallel connection with a series connection structure of the inerter. According to the suspension parameter determining method, the minimum of a Sperling index is used as an optimization object, under the premise that the root-mean-square value of the dynamic deflection of the second level vertical suspension is not beyond one third of a limiting stroke, the parameter is obtained by optimization through a particle swarm optimization algorithm. A simulation analysis result shows that the railway vehicle second level vertical suspension and the parameter determining method thereof, the Sperling index of railway vehicles can be effectively lowered in the riding process, and the riding stability of the railway vehicles can be improved.

Abstract Antenna device for hearing instruments The disclosure relates to an antenna device for hearing instruments, especially for hearing instruments to be worn in the auditory canal. A need exists specifying a hearing instrument, especially ITE hearing instrument having a data transmission system improved in respect of transmission bandwidth with no increase or only an insignificant increase in space and energy requirement. Disclosed an antenna device for a hearing instrument with an antenna arrangement (16) having a preferred send and receive spatial direction, and a further electrical hearing instrument component (13) which emits noise radiation predominantly in a noise radiation spatial direction. The antenna arrangement (16) and the further hearing instrument component (13) are disposed so that the send and receive spatial direction and the noise radiation spatial direction are oriented transverse to one another in such a way that a coupling-in of noise radiation into the antenna arrangement is reduced. The reduction of the noise couplings into the antenna arrangement makes possible a higher send and receive bandwidth, with the installation volume and energy requirement remaining the same. The further hearing instrument component can involve a receiver or any other component, especially one emitting inductive or electromagnetic radiation.

The invention provides a cushion for an engine suspension system and a preparation method thereof. The cushion comprises the following rubber materials in parts by weight: 60-80 parts of natural rubber, 20-40 parts of cis-polybutadiene, 5-8 parts of inorganic active agent, 1-3 parts of organic active agent, 1-3 parts of paraffin, 2-3 parts of age resister A, 1-1.5 parts of age resister B, 1-2 parts of heat stabilizer, 1-3 parts of antifatigue, 1-2 parts of silane coupling agent, 5-10 parts of white reinforced material, 10-30 parts of fast compression reinforced material, 30-40 parts of semi reinforced material, 5-10 parts of softener, 1.5-2.0 parts of vulcanizing agent and 1-2 parts of vulcanizing aid. The cushion for an engine suspension system has excellent endurance quality and outstanding heat/oxygen aging resistance and also has remarkable anti-fatigue performance under a dynamic condition.

The air spring ultra low frequency vibration separation method and device based on the differential electromagnetic actuator includes the air feed system, the high controlling system, a group of the air spring, the basal body, the electromagnetic actuator which not only provides the negative rigidity but the controlled damping force for the system, the speed sensor, the force sensor, the displacement sensor, the power amplifier, the model/number convertor, the number/model convertor and the controller. The invention provides the negative rigidity and the controlled initiative damping force by the reciprocity of the differential electromagnetic and the gag bit fixed on the basal body and the ground separately which is used in the field of high need for the cross-portrait ultra low frequency vibration separation capability.

The invention provides a novel vibration control device with vibration isolation and absorption functions. The novel vibration control device comprises an outer corrugated pipe, an inner corrugated pipe, an upper end plate, a lower end plate and a mass block; the upper end plate and the lower end plate are in bolted connection with mechanical equipment and an installation base by the aid of through holes; the outer corrugated pipe is fixedly connected with the upper end plate and the lower end plate in a welded manner and realizes effects of a vibration isolator; and two ends of the inner corrugated pipe are respectively fixedly connected with an inner cover and the mass block, and the axial rigidity of the inner corrugated pipe and the mass of the mass block are adjusted, so that effects of a vibration absorber can be realized. Accordingly, the novel vibration control device has the vibration isolation and power vibration absorption functions, has the advantage of compact structure, and can easily solve the problem of difficulty in controlling vibration of mechanical equipment which is arranged at a small spatial position and is incapable of being simultaneously provided with vibration isolation and absorption devices.

The invention discloses an automobile suspension mechanism. The automobile suspension mechanism comprises a connecting screw rod, an upper cover plate, an upper metal rubber spring, an upper mounting seat, a middle mounting plate, a lower mounting seat, a lower metal rubber spring and a lower cover plate, wherein the upper cover plate, the upper metal rubber spring, the upper mounting seat, the middle mounting plate, the lower mounting seat, the lower metal rubber spring and the lower cover plate sequentially sleeve the connecting screw rod; a rod body of the connecting screw rod is sequentially provided with a mounting part, a convex shoulder and a sleeve part, and the lower cover plate is connected with the tail end of the sleeve part through a fastening piece; the upper and lower mounting seats are respectively connected with the two faces of the middle mounting plate, the upper cover plate and the upper metal rubber spring are sequentially snapped between the convex shoulder and the upper mounting seat, and the lower metal rubber spring is snapped between the lower cover plate and the lower mounting seat; the height of the upper metal rubber spring is 1/2-1/3 that of the lower metal rubber spring. The automobile suspension mechanism has good elastic and damping properties and has the characteristics of high-/low-temperature resistance, corrosion resistance, aging difficulty, no radiation environment fear and the like; due to the adoption of graded earthquake resistance, vibration absorption, vibration isolation and noise reduction can be better realized, and provided compressive and tensile capability can be accurately matched with actual driving conditions.

The invention relates to an infrastructure large-load multidirectional vibration isolation and reduction device and a disaster prevention method thereof. The device comprises an upper end cover, a base, a vertical vibration reduction part, horizontal vibration reduction parts and the like. Under the action of a vertical load, a pressing cylinder of the upper end cover of the device extrudes a belleville spring of the vertical vibration reduction part, a pressing shaft extrudes energy dissipation and vibration reduction blocks of the vertical vibration reduction part, and the belleville springand the energy dissipation and vibration reduction blocks isolate and consume vibration in the vertical direction together. The base is provided with a limiting table to ensure that the vertical displacement of a main structure is within an allowable range. Under the action of horizontal earthquakes, viscoelastic damping materials of the horizontal vibration reduction parts plays a role in energydissipation and damping through compressive deformation. Under the action of torsion or eccentricity, oblique force transmission units ensure that the device does not roll over or overturn through thespatial arrangement of the oblique force transmission units. The device has the advantages of being large in bearing capacity, high in damping and capable of achieving multi-direction vibration isolation and reduction, and good energy dissipation capacity is provided for the device through the use of the energy dissipation vibration reduction blocks.

The invention discloses a multi-dimensional vibration isolation platform provided with multiple air springs and multiple dampers. The lower ends of the air springs and the lower ends of the dampers are connected with a base frame lower plate in a hinged mode through hinges. The upper ends of the air springs and the upper ends of the dampers are connected with a load disc through ball-shaped hinges. The load disc is connected with hydraulic cylinder piston rods of multiple hydraulic cylinders in a hinged mode through connecting rods. Cylinder bodies of the hydraulic cylinders are connected with a base frame upper plate in a hinged mode. The invention further discloses the air springs in the vibration isolation platform. By the adoption of the technical scheme, hydraulic pressure components serving as negative rigid components are in parallel connection with the air springs serving as positive rigid components, quasi-zero rigidity of the vibration isolation platform at a balance position and non-linear rigidity of the vibration isolation near the balance position are achieved, the difficulties caused when a traditional linear vibration isolation system isolates low-frequency vibration or ultra-low-frequency vibration can be solved, rigidity and damping can be adjusted simply and conveniently, and the multi-dimensional vibration isolation platform and the air springs are suitable for wide-frequency-domain vibration isolation and have good engineering applicability.

The invention relates to an intelligent vibration isolation device for a precision machine tool. At present, no intelligent vibration isolation device which is reasonable in structural design and is remarkable in vibration damping effect is available for the precision machine tool. The intelligent vibration isolation device is characterized by comprising a detection unit, a control unit and an executing unit, wherein the detection unit is used for detecting the vibration direction, frequency and amplitude of external vibration through a PVDF (Polyvinylidene Fluoride) piezoelectric slice, converting the external vibration into an electric signal through a signal processing system, and correcting and amplifying the electric signal to provide an executing parameter; the control unit is used for receiving the signal from the detection unit, working out data which is opposite to the external vibration in phase but identical in amplitude, and converting the data into an electric signal; the executing unit is used for receiving the electric signal from the control unit, converting the electric signal into a motion signal by using an inverse piezoelectric effect and counteracting and weakening the external vibration through self deformation for realizing vibration damping and vibration isolating functions; and the executing unit, the control unit and the detection unit are sequentially connected. The intelligent vibration isolation device is reasonable in structure design, remarkable in vibration damping effect, and reliable in performance.

The invention discloses a suspension type floating plate vibration isolation system, which comprises area floating plates, rubber vibration damping belts and a plurality of precast vibration isolation units, wherein the plurality of precast vibration isolation units are arranged on floor slabs or the ground, and are cast on site to form the area floating plates; the area floating plates are supported on the floor slabs or the ground by vibration isolators in the precast vibration isolation units and form gaps with the ground or floors to isolate vibration and noise; a plurality of area floating plates are arranged; and the rubber vibration damping belts are arranged among different area floating plates to limit the transmission of vibration in the horizontal direction. The suspension type floating plate vibration isolation system can isolate the vibration of machines from the floor slabs, is not needed to be jacked in the construction process and is easy to maintain and replace in the using process.

The invention discloses a double-layer vibration isolation seat, which comprises a seat surface and a vibration isolation platform arranged below the seat surface, wherein a seat base is arranged below the vibration isolation platform, and is characterized in that: a first-layer vibration isolation structure positioned at the lower layer and a second-layer vibration isolation structure positionedat the upper layer are arranged between the seat base and the vibration isolation platform, wherein the first-layer vibration isolation platform structure comprises vertically arranged vertical damping springs and negative rigidity vibration isolation structure arranged at the front and rear sides of the vertical damping springs, and the second-layer of vibration isolation structure is arranged above the vertical damping spring. The double-layer vibration isolation seat disclosed by the invention is simple and compact in structure and good in vibration isolation effect; the vibration isolationstructure at the bottom layer is connected with the spring damping above in series to form the double-layer vibration isolation structure, so that the damping ratio, the mass ratio and the rigidity ratio can be properly reduced, thereby the vibration isolation performance of the whole double-layer vibration isolation system is improved; meanwhile, the chair has the advantages of low cost, high reliability and comfort, and better application prospect.

The invention relates to a pneumatic spring vibration isolator of an air flotation type forward and backward swing concatenation mechanism based on a ball head connecting rod, which belongs to the ultra-precise measurement and processing field. An inner cylinder is assembled in an outer cylinder of the vibration isolator, an air bag for an air spring is sleeved outside the upper end of the inner cylinder, a support rod is arranged in the chamber of the inner cylinder after penetrating through an annular cover plate, and the upper end and the lower end of a diagonal cable wire are respectively fixed with the annular cover plate and the support rod to form a single swing mechanism; an upper ball seat and a lower ball seat are respectively arranged on the lower end of the support rod and the upper end surface of the air spring, and the upper end and the lower end of the ball head connecting rod are respectively arranged in the upper ball seat and the lower ball seat to form a reversed swing mechanism; and the single swing mechanism and the reversed swing mechanism form the forward and backward swing concatenation mechanism. The air spring is used as a reversed swing spring, and the rigidity of the reversed swing spring can be changed by continuously adjusting the internal pressure of the air spring, thereby the real time adjustment of the rigidity of the forward and backward swing concatenation mechanism can be realized to meet requirements of different operating conditions. The pneumatic spring vibration isolator is introduced by the forward and backward swing concatenation mechanism, which not only enhances the comprehensive vibration isolation performance of the isolator, but also overcomes many disadvantages of other types of isolators.