Air-float magneto motive friction-free suspension device

Abstract

The utility model relates to an air-floated magnetic motive frictionless suspending device, comprising a frame, a mounting case, a mobile beam, a plurality of guiding bars, a main rod, an air floatation system and a magnetic motive system, wherein, the air floatation system comprises two frictionless cylinders and two air storage tanks of same size; the magnetic motive system comprises a moving coil with a long stroke and the iron core of a exciter; the mounting case is fixed in the middle part of the frame, and a lower mounting plate is positioned in the lower part of the frame; a top plate and a bottom plate are positioned on the mounting plate; two small air bearings for installing the guide bars and a large air bearing for installing the main rod are positioned on the top plate; a large air bearing for installing the guide bars is positioned below the bottom plate; two frictionless cylinders are positioned symmetrically above the mounting plate under the frame; the cylinder rod of the frictionless cylinder is connected with the mobile beam with a connecting hinge; the mobile beam comprises two symmetric parts; the main rod and two guide bars are positioned on the mobile beam; two stop plates are positioned on the two ends of the main rod. The utility model has advantages of meeting the frequency criterion under ultra-low frequency condition, little enough added mass, the small influence of the nonlinearity, and the high testing precision.

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

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