Follow-up type air-floating magneto-motive friction-free suspension device

Abstract

A follow-up air-floating magnetic frictionless suspension device, including an installation frame, a moving beam, a guide rod, an air flotation system and a magnetic system, the air flotation system includes two frictionless cylinders, two air storage tanks, no The friction cylinder is connected to the air pipe, precision pressure reducing valve, and air intake pipe; the magnetic system includes a long-stroke moving coil and an exciter iron core; two friction-free cylinders are symmetrically installed above the bottom plate of the installation frame, and the friction-free cylinder The frictionless cylinder is connected to the air pipe with the air storage tank. The compressed air source is connected to the air storage tank through a precision pressure reducing valve and the air source intake pipe. The piston rod of the frictionless air cylinder is connected to the moving beam through a connecting hinge. The air bearing is installed on the guide rod, the guide rod is fixedly installed on the installation frame, the air path in the moving beam is connected to the air bearing, and a suspension rod is fixed below the moving beam. 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, in particular to a follow-up 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 car...

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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 A follow-up air-floating magnetic frictionless suspension device that is small enough, has little nonlinear influence, and has high test accuracy

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