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1619results about "Springs/dampers functional characteristics" patented technology

Negative stiffness adjustable zero stiffness vibration isolation device and application method thereof

The invention discloses a negative stiffness adjustable zero stiffness vibration isolation device and an application method thereof, wherein the negative stiffness adjustable zero stiffness vibrationisolation device comprises a bearing table, a positive stiffness mechanism is arranged at the lower side of the bearing table, a plurality of adjustable negative stiffness mechanisms which are centrosymmetrically arranged are connected around the bearing table, the positive stiffness mechanism comprises a vertical elastic element for supporting the bearing table, and the adjustable negative stiffness mechanism comprises a horizontal elastic element for applying horizontal acting force to the bearing table; and the application method comprises the steps of installing a bearing object on the bearing table and then adjusting each height adjusting mechanism to enable the horizontal elastic element to be horizontal. The negative stiffness adjustable zero stiffness vibration isolation device canflexibly adjust the negative stiffness according to the bearing at any time, so that the negative stiffness can be adjusted according to the actual situation after bearing, the negative stiffness adjustable zero stiffness vibration isolation device can be adjusted to ensure that the negative stiffness adjustable zero stiffness vibration isolation device is in an ideal state that the dynamic stiffness is close to zero in a static load state after field installation, the failure of a vibration isolation system can be avoided, and the negative stiffness adjustable zero stiffness vibration isolation device has the advantages of simple structure, easiness in processing, convenience in loading and unloading, reasonable design and easiness in adjustment.
Owner:STATE GRID HUNAN ELECTRIC POWER +2

SMA spring-STF viscous damper

The invention provides an SMA spring-STF viscous damper which comprises a first connecting component, a piston rod, a left end cover, a first damping cavity, a damping cylinder, a piston, a second damping cavity, two SMA springs, a right end cover and a second connecting component, wherein the left end cover is arranged at one end of the damping cylinder; the right end cover is arranged at the other end of the damping cylinder; the interior of the damping cylinder is divided by the piston into the first damping cavity and the second damping cavity; the SMA springs which sleeve the piston rod are correspondingly arranged in the first damping cavity and the second damping cavity; the first damping cavity and the second damping cavity are filled with an STF shearing thickener; when the pistonmoves towards one side, the SMA spring on one side is compressed, and the SMA spring on the other side is restored towards the trend of the original length; and due to the different expansion and contraction degrees of the SMA springs on both sides, the resistance difference is produced, and the damping force is provided for the viscous damper. The SMA spring-STF viscous damper provided by the invention has the effects of improving the energy consumption under low-frequency loads and causing limiting resistance to the structural excessive displacement; furthermore, the self-resetting effect can be achieved after unloading; and the SMA spring-STF viscous damper has the advantages that the structure is simple and the space is saved.
Owner:SHENYANG JIANZHU UNIVERSITY

Quasi-zero stiffness vibration isolator applicable to isolation of micro-amplitude and low-frequency vibration and realization method of quasi-zero stiffness vibration isolator

The invention relates to a quasi-zero stiffness vibration isolator applicable to isolation of micro-amplitude and low-frequency vibration and a realization method of the quasi-zero stiffness vibration isolator and relates to the field of an isolation vibration device. The quasi-zero stiffness vibration isolator comprises a base, wherein an elastic hoisting mechanism is arranged in the middle of the base; an object carrying platform is arranged at the upper end of the elastic hoisting mechanism; and the two sides of the object carrying platform are connected with negative rigidity mechanisms arranged at the two side parts of the base respectively. The realization method comprises the steps: an object subjected to vibration isolation and having a certain weight is put on the object carrying platform to compress a spring; the object carrying platform moves downwards and drives a connecting rod; the connecting rod pushes a shaft rod to slide horizontally in a transverse groove of a fixed frame; a shearing and forking mechanism extends downwards and a resetting spring is compressed; the connecting rod moves on a horizontal position so that the vibration isolator is located at a balanced position; when external vibration and excitation act on the base, the vibration is transmitted onto the vibration isolator; and then the vibration isolator starts to work to isolate the micro-amplitude and low-frequency vibration. The vibration isolator provided by the invention not only can guarantee certain bearing capability and extremely low rigidity, but also has a stroke amplification effect; and meanwhile, the realization method is simple and convenient.
Owner:FUZHOU UNIV

Semi-active energy regenerative suspension shock absorber based on mixed excitation and size determining method of shock absorber

The invention discloses a semi-active energy regenerative suspension shock absorber based on mixed excitation and a size determining method of the shock absorber. The shock absorber comprises an upper hoisting lug, a dust cover, a lower hoisting lug, a hydraulic shock absorber body and a mixed excitation mechanism. The hydraulic shock absorber body provides the constant viscous damping coefficient. The mixed excitation mechanism provides the adjustable electromagnetic damping force and converts vibration energy into electric energy for storage. Meanwhile, the invention provides the size determining method. The model selection of the hydraulic shock absorber body is determined according to the rating requirements, an electromagnetic damping force expression is derived, the primary size of the mixed excitation mechanism is determined through a particle swarm optimization algorithm, finite element analysis is conducted, the gas length is optimized, and the final size is determined. According to the shock absorber and the size determining method, the hydraulic shock absorber body and a mixed excitation cylindrical linear motor are integrated, the damping force is adjustable, energy is recovered in the working process, the structure is simple, the shock isolation performance and the energy regenerative performance of a vehicle suspension are coordinated, and the Fail-safe function is also achieved; and in addition, the size determining method is clear in step, easy to implement and obvious in optimization result, and has high practicalness.
Owner:JIANGSU UNIV

Permanent magnet low frequency single-degree-of-freedom vibration isolation mechanism based on negative stiffness theory

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.
Owner:TSINGHUA UNIV +1

Two-degree-of-freedom ultralow-frequency vibration isolator

ActiveCN106321707ARealization of ultra-low frequency vibration isolation with degrees of freedomVibration isolation achievedNon-rotating vibration suppressionSprings/dampers functional characteristicsMarine engineeringAir spring
The invention discloses a two-degree-of-freedom ultralow-frequency vibration isolator. The two-degree-of-freedom ultralow-frequency vibration isolator comprises a basic platform (10) and a load-bearing platform (30), and the basic platform (10) and the load-bearing platform (30) are connected through supporting rods. The two-degree-of-freedom ultralow-frequency vibration isolator is characterized in that the vibration isolator further comprises a positive-stiffness air spring (20) and a magnetic negative-stiffness mechanism (28) with adjustable negative stiffness, and the positive-stiffness air spring (20) and the magnetic negative-stiffness mechanism (28) form a parallel mechanism in the direction of the center axes of the basic platform and the load-bearing platform, so that the inherent frequency in the direction of the center axes of the basic platform and the load-bearing platform is decreased; and a stiffness-adjustable positive-stiffness leaf spring and a negative-stiffness inverted pendulum are arranged in the direction perpendicular to the center axes of the basic platform and the load-bearing platform and form a negative-stiffness parallel mechanism, so that the inherent frequency in the direction perpendicular to the center axes of the basic platform and the load-bearing platform is decreased. According to the vibration isolator, positive-stiffness and negative-stiffness parallel type passive structures are adopted both in the direction of the center axes of the basic platform and the load-bearing platform and in the direction perpendicular to the center axes of the basic platform and the load-bearing platform, and thus vibration of two degrees of freedom is achieved at the same time.
Owner:HUAZHONG UNIV OF SCI & TECH
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