An Electromagnetic Quasi-Zero Stiffness Vibration Isolation System Based on Stewart Platform

Abstract

The invention discloses an electromagnetic quasi-zero stiffness vibration isolation system based on the Stewart platform. The electromagnetic quasi-zero stiffness vibration isolation system based on the Stewart platform comprises an upper platform and a lower platform, the upper platform and the lower platform are oppositely arranged, six vibration isolation devices are arranged between the upperplatform and the lower platform, six vibration isolation devices are arranged according to a Stewart platform mode, a first diaphragm spring is arranged at one ends of the vibration isolation devicesin a sleeved mode, the other end of the vibration isolation device is sleeved with a second diaphragm spring, each vibration isolation device comprises a guide shaft, a magnet set is arranged on the outer side of the guide shaft, a coil set is arranged on the outer side of the magnet set, a gap is formed between the magnet set and the coil set, and an outer cylinder is arranged on the outer side of the coil set. According to the electromagnetic quasi-zero stiffness vibration isolation system, the adjustable nonlinear negative stiffness is realized by utilizing the mutual acting force between the permanent magnet and the conductive coil, the first diaphragm spring and the second diaphragm spring provide positive rigidity, and the quasi-zero rigidity near the working position is achieved through combination of positive and negative rigidity; the electromagnetic quasi-zero stiffness vibration isolation system has the advantages of being simple in structure, the rigidity is controllable and the like, the inherent frequency of the vibration isolation system is effectively reduced, and further the vibration isolation frequency band is widened.

Description

technical field [0001] The invention relates to the technical field of semi-active vibration isolation, in particular to an electromagnetic quasi-zero stiffness vibration isolation system based on a Stewart platform. Background technique [0002] With the continuous development of science and technology, mechanical equipment is gradually developing in the direction of precision and intelligence, and the requirements for the working environment are becoming more and more stringent. Vibration will not only affect the service life of precision instruments and equipment, but also affect the use of instruments and equipment (such as optical cameras). For example, for precision equipment such as precision machine tools and microscopes, the low-frequency vibration from the surrounding environment will seriously affect the accuracy of the equipment, so we need to control the vibration. Vibration isolation is an important means of vibration control. According to different vibration...

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Problems solved by technology

However, active vibration isolation has disadvantages such as high energy consumption, complex structure, and high cost.

However, the traditional passive vibration isolation system, the vibration isolation frequency band is limited by the natural frequency, only has a good vibration isolation effect in the high frequency band, it is difficult to achieve low frequency vibration isolation, and lacks the ability to adjust

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