JPH04368298A - Damping device for spatial structural body - Google Patents

Abstract

PURPOSE:To enable a damping device to be used highly reliably for a long time in a vacuum environment. CONSTITUTION:The first and the second guide members 12a and 12b, a pole screw bar 13, a driving motor 14 and a driven unit 15 are combined together so as to be arranged on a base plate 11 mounted on a spatial structural body 10, and these are covered with a sealing container 16 so as to be sealed up, and gas is sealed up in this sealing container 16, and the inside of the container is set to be kept as a gravitational field, and lubrication is realized by using oil and so on similarly to a ground environment, so that the service life can be lengthened.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a space structure suitable for suppressing vibrations of a space structure including, for example, a spacecraft.

0002

2. Description of the Related Art Recently, in the field of space development, the development of large space vehicles such as space stations has been progressing. For such large spacecraft, it is considered to construct various structures, install various experimental machines, and conduct various experiments unique to outer space. In this case, the space structure including the spacecraft is required to be provided with a vibration damping device that suppresses vibrations generated due to the operation of the experimental machine to realize stable operation.

As such a vibration damping device, one for use on the ground as shown in FIG. 3 is known. That is, a base 2 is attached to a structure 1 that is a vibrating body, and a guide member 3 is erected on this base 2. A driven part 4 for generating inertial force is movably attached to the guide member 3. The driven part 4 is moved along the guide member 3 via the drive mechanism 5, and the vibration of the structure 1 is suppressed by the inertia force generated as the driven part 4 moves.

However, since the vibration damping device described above is intended for the gravitational field on the ground, when used in space in a zero gravity environment, the driven portion 4 and the guide member 3
As a means of lubrication for the contact points and the drive mechanism 5, it is difficult to lubricate effectively unless vacuum lubrication is applied, which has a short life and is extremely troublesome to handle, resulting in a very short life. There is a problem.

[0005]

[Problems to be Solved by the Invention] As mentioned above, when using conventional vibration damping devices in outer space, vacuum lubrication must be applied as a lubrication means, resulting in a short lifespan. It had

[0006] This invention was made in view of the above circumstances, and provides a control for a space structure that has a simple configuration, can realize highly reliable use in outer space, and has a long service life. The purpose is to provide a shaking device.

[0007]

[Means for Solving the Problems] The present invention includes a base mounted on a space structure, a driven part for generating inertial force provided movably with respect to the base, and a movement control system for the driven part. a drive means for generating an inertial force and suppressing vibrations of the space structure, and a drive means attached to the base so as to cover the driven part and the drive means, and a gas having a predetermined pressure sealed inside. This is a vibration damping device for a space structure.

[0008]

[Operation] According to the above structure, the driven part and the driving means disposed on the base are housed in the sealed container of the base, and by maintaining an environment almost the same as a gravitational field, It becomes possible to provide lubrication substantially similar to that in the environment. This enables highly reliable operation over a long period of time in the space environment.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a vibration damping device for a space structure according to an embodiment of the present invention.
A base 11 is attached to the base 0. This base 11 has a first
and second guide members 12a, 12b are erected with a predetermined interval, and the first and second guide members 12a, 12
A ball screw rod 13 is erected between b (see Fig. 2).
. The base end of this ball screw rod 13 is connected to, for example, a drive motor 14, and drives the drive motor 14 to rotate. For example, a disk-shaped driven portion 15 is movably screwed into the ball screw rod 13. This driven part 15
A pair of guide grooves 15a and 15b are provided in correspondence with the first and second guide members 12a and 12b, and this guide groove 1
5a, 15b have first and second guide members 12a, 12
b is inserted in a freely guiding manner (see FIG. 2).

[0011] Also, on the base 11, a closed container 16 having a bottomed cylindrical shape, for example, a retractable bellows, is attached to the first and second containers.
The guide members 12a and 12b, the ball screw rod 13, the drive motor 14, and the driven part 15 are covered and sealed. In this airtight container 16, for example, N2
A gas such as gas is sealed under reduced pressure.

In the above configuration, when the drive motor 14 is driven, a rotational force is applied to the driven part 15, and accordingly, the driven part 15 moves between the first and second guide members 12a.
, 12b and is moved in the directions of arrows A and B. Here, the driven part 15 transfers inertial force to the space structure 1 to which the base 11 is attached in conjunction with its movement in the directions of arrows A and B.
0 to suppress the vibration.

[0013] As described above, the space structure vibration damping device has the first and second guide members 12a, 12b, the ball screw rod 13,
A driving motor 14 and a driven part 15 are arranged in combination, and a closed container 16 is placed to seal them, and a gas is sealed in the closed container 16 to maintain the inside of the container in a gravitational field. According to this, even when used in outer space, the contact points between the first and second guide members 12a and 12b and the driven part 15, and the movable parts such as the drive motor 14 and the ball screw rod 13 are lubricated. By making it possible to use oil or the like as a means to do so, as in the terrestrial environment, highly reliable operation can be achieved over a long period of time in space.

[0014] Furthermore, since the entire mechanism is disposed within the airtight container 16, it is possible to easily perform a mock test on the ground, for example, thereby simplifying its handling. It will also be realized.

In the above embodiment, the first and second guide members 12a, 1 are used as means for driving the driven portion 15.
2b, a ball screw rod 13, and a drive motor 14, but the present invention is not limited thereto. For example, it may be constructed by combining a well-known screw spring bearing called a flexural pivot, a non-contact electromagnetic actuator, etc. It is also possible.

Further, in the above embodiment, the airtight container 16 is constructed using a telescopic bellows, but is not limited to this, and may be constructed using a rigid container, for example. Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[0017]

[Effects of the Invention] As detailed above, according to the present invention, there is provided a space structure that has a simple configuration, can realize highly reliable use in outer space, and has a long service life. A vibration damping device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a vibration damping device for a space structure according to an embodiment of the present invention.

FIG. 2 is a diagram showing the arrangement of driven parts in FIG. 1;

FIG. 3 is a diagram showing a conventional vibration damping device.

[Explanation of symbols]

10... Space structure, 11... Base, 12a, 12b... 1st
and second guide member, 13...ball screw rod, 14...drive motor, 15...driven part, 16...closed container.

Claims (1)

[Claims] Claim 1: a base mounted on a space structure; a driven part for generating inertia movably provided with respect to the base; movement of the driven part controlled to generate inertia; A driving means for suppressing vibrations of the space structure; and an airtight container that is attached to the base so as to cover the driven part and the driving means, and in which gas having a predetermined pressure is sealed. A vibration damping device for a space structure characterized by: