Zero (micro) gravity suspension method and device with zero-frequency vibration isolation characteristic

Abstract

The invention discloses a zero (micro) gravity suspension method and device with a zero-frequency vibration isolation characteristic and relates to the technical field of zero gravity or micro gravity environmental simulation in the outer space. The problems of space ground simulation, low-frequency and ultralow frequency vibration isolation and the like are solved. The series of suspension devices can be each substantially seen as being formed by connecting a vertical spring and a vertical spring which support gravity support through a connecting rod and a suspended object. According to the basic principle, support force which is equal to the magnitude of the gravity and opposite to the direction of the gravity is provided through geometric nonlinearity arrangement of a spring connecting rod mechanism, so that the resultant force acted on the suspended object within the device design range is zero, and thus the suspended object is in the suspension state. The zero (micro) gravity suspension device can be used for space zero and micro gravity environments including ground simulation experiments such as spacecraft docking, large space flexible structure dynamics performance tests and astronaut training. Through the suspension characteristics of the zero (micro) gravity suspension method device, the problems of low-frequency and ultralow frequency vibration isolation can be solved effectively, and the defect that through a traditional vibration isolation theory, system resonance is difficult to be avoided is overcome.

Description

technical field [0001] The invention provides a type of zero (micro) gravity suspension device, which involves a series of zero (micro) gravity environment ground simulation experiments including space spacecraft docking, dynamic performance testing of large flexible structures, and astronaut training, as well as low-frequency, super Low frequency (low to zero frequency) vibration isolation and other fields. Background technique [0002] 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 air flotation method can only realize two-dimensional translation and one-dimensional rotation, and cannot meet the requirements of a zero (micro) gravity environment in space. The suspension method has a complex st...

AI Technical Summary

Problems solved by technology

Although the water float method can simulate the zero (micro) gravity environment in space, the astronauts must wear space suits, and the equipment needs to be waterproofed, so the cost is expensive

The air flotation method can only realize two-dimensional translation and one-dimensional rotation, and cannot meet the requirements of the zero (micro) gravity environment in space

Suspension method has complex structure, large floor space and coupled vibration between equipment and suspension system, and also cannot achieve zero (micro) gravity environment

[0003] The above methods can be classified into a class of (in is the vertical acceleration, is the natural frequency of the system, m and k are respectively the mass of the suspended object and the support stiffness of the system), the dimensionless vibration system, regardless of the natural frequency ω 0 No matter how small it is, it is difficult to realize the ground simulation of the space zero (micro) gravity environment

[0004] The ground simulation experiment in the space zero (micro) gravity environment is essentially a problem of isolating the vibration of the simulated test piece from the basic environment, while the traditional method only considers the frequency of the basic environment Vibration isolation can only be realized when the time is high, so the traditional method cannot simulate the zero (micro) gravity environment in space;

[0005] In order to reduce the natural frequency ω of the linear system 0 , a class of quasi-zero stiffness systems has emerged in recent years, whose dimensionless dynamic equations can be reduced to The system operates only when the base ambient frequency Only when it has vibration isolation performance, it is also unable to accurately simulate the zero (micro) gravity environment

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