Air-float magneto motive friction-free suspension device

Abstract

An air-floating magnetic frictionless suspension device, including a frame, an installation frame, a moving beam, a guide rod, a main rod, an air-floating system and a magnetic system. The air-floating system includes two frictionless cylinders, two identical Gas storage tank; magnetic system includes long-stroke moving coil and exciter iron core; the middle part of the frame is fixed with a mounting frame, and the lower part has a mounting plate under the frame; the mounting frame has a top plate and a bottom plate, and two installation guides are installed on the top plate A small air bearing for the rod, a large air bearing for the main rod; a large air bearing for the main rod is installed under the bottom plate; two frictionless cylinders are installed symmetrically above the mounting plate under the frame, and the piston of the frictionless cylinder The rod and the moving beam are connected through a connecting hinge; the moving beam is composed of two symmetrical parts, a main rod and two guide rods are installed on the moving beam, and limiting plates are installed at both ends of the main rod. The invention can also meet the frequency criterion at the time of ultra-low frequency, the additional mass is small enough, the non-linear influence is small, and the test precision is high.

Description

(1) Technical field [0001] The invention belongs to the field of modal test equipment, and in particular relates to an air-floating magnetic dynamic frictionless suspension device. (2) Background technology [0002] In the modal test of aerospace and some special requirements of specimens, there must be a special low-frequency suspension device to simulate the weightlessness of the specimen, that is, to simulate its fixed-free or free-free boundary conditions through a special suspension system. [0003] In order to reduce the influence of the suspension device on the additional stiffness, additional mass, additional friction and moment of the specimen, the suspension system should meet the frequency criterion and the stability criterion, that is, when the specimen is suspended, the rigid body suspension frequency should be lower than that of the specimen. 1 / 3~1 / 5 of the elastic natural frequency. [0004] At present, when the modal test of ultra-low frequency specimens is ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing suspension system that cannot meet the frequency criterion requirements, additional mass, large nonlinear influence, and large error in measurement results at ultra-low frequencies, the present invention provides a Enough small, non-linear influence, high test precision air-floating magnetic frictionless suspension device

Images