Positive and negative stiffness parallel three-translation vibration and impact isolation platform

Abstract

The invention discloses a positive and negative stiffness parallel three-translation vibration and impact isolation platform, and belongs to the field of the multi-axis vibration control technology and multi-axis vibration control devices, which comprises an upper platform (1), a lower platform (9), eight elastic branched-chain structures and a silica gel magnetorheological damper (11), wherein the eight elastic branched-chain structures are fixed between the upper platform (1) and the lower platform (9) two by two in an orthogonally symmetrical four-point supporting mode; the axes of the twoelastic branched-chain structures of each point are vertical mutually; and the silica gel magnetorheological damper (11) is arranged in the geometric center between the upper platform (1) and the lower platform (9). The positive and negative stiffness parallel three-translation vibration and impact isolation platform can be widely used for instruments and equipment in fields of aviation, space flight, weapons, vehicles, ships, construction, nuclear industry, mechanical industry, optical industry, semiconductor industry, photosensitive chemistry and the like, and has the advantages of large carrying capacity, high stability, small volume, low natural frequency, controlled damping, low cost of manufacturing and maintenance and the like.

Description

technical field [0001] The invention relates to a three-translation multi-axial buffering and vibration reduction device, which belongs to the field of multi-axis vibration control technology and devices. Background technique [0002] Mechanical vibration and shock can be divided into two types: uniaxial and multiaxial, according to the direction of their spatial action. With the development of modern industry, the power of power machinery equipment is increasing, the speed is accelerating, the stiffness is relatively reduced, and the precision requirements are getting higher and higher. At the same time, the structure is becoming thinner, more complex and larger, which leads to the continuous strengthening of the vibration source energy and the complexity of the vibration environment. , Spatialization makes the problem of multi-axial vibration hazards increasingly prominent, directly affects the accuracy of high-precision precision machining, the measurement and control acc...

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Problems solved by technology

[0004] Among the above-mentioned methods, "realized by a parallel mechanism with built-in elastic and damping elements" has the advantages of simple structure, compact model, high precision, and easy control, etc., and can realize pure three-translational motion output vibration control, such as the patent " Rubber-like multi-degree-of-freedom elastic damping device (ZL02258129.4), "a type of elastic multi-dimensional vibration-damping platform based on a hybrid kinematic pair parallel mechanism (ZL200410014088.9)", "magnetorheological semi-active multi-degree-of-freedom parallel Vibration damping device (ZL200810122615.6)", but because the selected parallel mechanism with few degrees of freedom and the arrangement position of its elastic elements have small bearing capacity, many kinematic pairs, large frictional resistance, poor force transmission, poor stability, and elastic elements are Defects such as unidirectional linear components make it impossible to withstand shock loads and achieve low-frequency vibration isolation, poor reliability and stability, and difficult to transform into practical applications

In addition, due to the high nonlinearity of the parallel mechanism itself, the arrangement position and quantity of its damping elements are not conducive to damping adjustment and control, making it difficult to implement

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