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Magnetic liquid damping vibration attenuating device

A technology of magnetic liquid and vibration damping device, which is applied in the direction of magnetic spring, spring/shock absorber, spring, etc., to achieve good vibration damping effect

Inactive Publication Date: 2012-06-13
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The volume of the non-magnetic enclosure is V 1 , the volume of the end cap screwed into the non-magnetic housing is V 2 , the volume of the permanent magnet is V 3 , the volume injected into the magnetic liquid is The non-magnetic shell is not filled with magnetic liquid, and it will cause a lot of inconvenience when applied to the spacecraft for vibration reduction during launch

Method used

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Embodiment approach 1

[0021] A magnetic liquid damping and vibration reduction device, the device includes a non-magnetic shell 2, a magnetic liquid 3, a permanent magnet 4, a nut 5, an end cover 6, a bolt 7, a screw 9, a gasket 10 and an O-ring 11. Connections between the above parts:

[0022] Put the permanent magnet 4 into the cavity of the non-magnetic shell 2, and fix the end cover 6 with the O-ring 11 on the end face of the open end of the non-magnetic shell 2 with bolts 7 and nuts 5 .

[0023] Fill the cavity of the non-magnetic shell 2 with magnetic liquid 3 through the threaded hole 8, and seal it with screws 9 and gaskets 10.

[0024] Described permanent magnet 4 is spherical, and its diameter is 20mm, and permanent magnet 4 selects NdFeB material for use.

[0025] The cavity formed by the non-magnetic shell 2 and the end cover 6 is a spherical cavity with an inner diameter of 50mm.

[0026] The interface between the non-magnetic shell 2 and the end cover 6 is parallel to the flange end...

Embodiment approach 2

[0032] The difference between Embodiment 2 and Embodiment 1:

[0033] The diameter of the permanent magnet 4 is 30 mm.

[0034] The inner diameter of the spherical cavity is 40mm.

[0035] The magnetic fluid 3 is an oil-based magnetic fluid with a viscosity of 250 mPa·s at 27°C.

[0036] The invention is suitable for local vibration reduction of many longer objects (such as solar sails, satellite antennas, etc.) in space vehicles.

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Abstract

The invention discloses a magnetic liquid damping vibration attenuating device which is suitable for vibration attenuation for longer objects in a spacecraft and used for solving the problem of vibration attenuation in the spacecraft. The device comprises a non-magnet conductive shell (2), magnetic liquid (3), a permanent magnet (4), nuts (5), an end cover (6), bolts (7), screws (9), a sealing gasket (10) and an O-shaped sealing ring (11); the parts are connected as follows: the permanent magnet (4) is arranged in a cavity of the non-magnet conductive shell (2); the end cover (6) with the O-shaped sealing ring (11) is fixed on the end surface of the open end of the non-magnet conductive shell (2) by using the bolts (7) and the nuts (5); the cavity of the non-magnet conductive shell is full of magnetic liquid through a threaded hole and is sealed by using the screws and the sealing gasket. A cavity formed by the non-magnet conductive shell (2) and the end cover (6) is a ball-shaped cavity. The non-magnet conductive shell (2) and the permanent magnet (4) adopted by the device are in circular ball shapes, therefore, the magnetic liquid damping vibration attenuating device can be used for attenuating the vibration in any direction and good in vibration attenuating effect.

Description

technical field [0001] The invention relates to a damping and vibration-reduction structure, which is suitable for vibration reduction of low-frequency, small-amplitude vibrations, especially in the weightless environment of spacecraft. Background technique [0002] Magnetic fluid damping is a new type of damping that is very sensitive to inertial forces. In the space vehicle, due to its special working environment and the limitations of energy, volume and weight, the shock absorber is required to be small in size, light in weight and high in reliability. In spacecraft, there are many local vibration reduction problems of long objects (such as solar panels, satellite antennas, etc.), and the vibration of these long objects has the characteristics of low frequency, small displacement, and small acceleration. For vibrations of this nature, the damper must be very sensitive to inertial forces. Other damping methods are difficult to meet the requirements. [0003] The applica...

Claims

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Application Information

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IPC IPC(8): F16F6/00
Inventor 李德才王庆雷
Owner BEIJING JIAOTONG UNIV
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