Passive suspension vibration isolation method and device with zero stiffness characteristics

Abstract

The invention discloses a passive suspension vibration isolation method and device with zero stiffness characteristics, and relates to the fields of gravity environment ground simulation, low-frequency vibration isolation, ultralow-frequency vibration isolation and the like. The passive suspension vibration isolation method and device with the zero stiffness characteristics are put forward to meetincreasingly higher requirements for space gravity ground simulation experiments in aerospace engineering, and to solve the existing technical problems in the low-frequency and ultralow-frequency vibration isolation. According to the suspension vibration isolation device, based on geometric nonlinear negative stiffness characteristics and the adjustability of geometrical parameters thereof, a vertical elastic element, sliding rails, sliding blocks, horizontal elastic elements and connecting rods are connected to a load, the characteristic of accurate zero-inherent frequency in a design rangeof the device is realized through parameter configuration, and a constant force that is collinear with the direction of gravity of the load and has no relation with displacement of the load can be provided for the load. The resultant force acting on the load in the design range is fixed in value, so that the load is enabled to be in a certain specific gravity environment. The full-frequency-band immunity of the load to the vibration environment is realized, and ultralow-frequency vibration isolation, the zero-rigidity suspension of a modal test and the ground simulation of the spatial gravityenvironment are realized.

Description

technical field [0001] The invention relates to a passive suspension vibration isolation method and device with zero stiffness characteristics, and relates to the fields of gravity environment ground simulation, low frequency, ultra-low frequency (zero frequency) vibration isolation, modal testing and the like. Background technique [0002] In actual engineering, there is a large demand for support (suspension) systems with specific static support stiffness and low (zero) dynamic stiffness, such as space gravity environment simulation experiments, high-precision vibration isolation platforms, and large-scale flexible system modal test experiments. International zero (micro) gravity ground simulation experiment methods mainly include water flotation, air flotation and suspension. Although water floatation can simulate the zero (micro) gravity environment in space, astronauts must wear space suits, and their equipment needs to be waterproofed, so the cost is expensive. The ai...

AI Technical Summary

Problems solved by technology

The system operates only when the base ambient frequency It has vibration isolation performance at the same time, so it is also impossible to accurately complete the space gravity environment simulation, ultra-low frequency (low to zero frequency) vibration isolation and modal test experiments of large flexible systems

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