JPS62234800A - Spin type artificial satellite - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a function to automatically adjust the moment of inertia around the spin axis of a spin-type artificial satellite and maintain the spin rate at a nominal value. Regarding spin-type artificial satellites.

[Conventional technology]

In conventional spin-type satellites, the magnitude of the spin rate cannot be controlled, and even if it deviates significantly from the nominal value, it cannot be corrected.

The spin rate of a spin-type satellite is determined by attitude control, orbit control, etc.
It changes due to changes in the t distribution, or due to the approach of limiting stones, etc.

Among the onboard satellite equipment, the sun sensor, earth sensor, antenna bias control device, etc. are set to operate near the nominal spin rate before launch, and there may be errors in attitude/orbit control technology or mass distribution design. If the spin rate deviates significantly from the nominal value due to the approach of a corner stone after a stroke, the spin rate will not operate properly.

[Problem that the invention seeks to solve]

Conventional spin-type satellites have had the problem of not being able to control their spin rate.

[Means for solving problems]

The artificial satellite according to the present invention includes a box body provided at equiradial positions from the center of a platform at, and a box body mounted inside the box body via a shaft rod.

a sphere that moves along the shaft; and a sphere provided on the shaft;
A plurality of spin rate adjustment mechanisms are provided around the satellite spin axis of the platform, each consisting of a spring that connects each end of the box and the sphere.

[Effect]

In this invention, the torque around the spin axis that occurs as the spin rate increases or decreases from the nominal value is canceled out by a box mounted equiradially from the center of the satellite platform, and a sphere and spring installed inside the box. This system generates a directional torque to maintain the spin rate of a spin-type satellite at a nominal value.

〔Example〕

FIG. 1 is a schematic diagram showing a spin-type artificial satellite showing an embodiment of the present invention. In fig.

(1) is the satellite body, (2) is the platform, (3)
is the spin axis, (4) is a box provided at equiradial positions from the IT center of the platform, and (6) is the box (4).
The metal ball (6) installed inside the metal ball (5) is a clever box (
4) is attached to the shaft rod, (7) is the metal ball (5) and the box body (
4) is the spring that connects the platform (8) is the spring that connects the platform (
The center of mass of 2), (9) is the box (4), the metal ball (5),
In Figure 2, which shows the spin rate adjustment mechanism consisting of a shaft (6) and a spring (7), (A) indicates the spin direction. In Figure 1, the two-box body (4) is the platform (2).
Although three are provided within the platform, two or more may be provided at equiradial positions from the center of the platform. It is also assumed that the center of mass of the satellite and the center of gravity (8) of one ratform coincide, as is the case with many spin-type artificial satellites. or.

If there are multiple platforms, the center of mass (3) of the platform of the present invention shall be aligned with the center of mass of the satellite.

FIG. 2 is a diagram showing a spin rate adjusting machine m' according to the present invention. In the figure, (4) is a box.

(5) is a metal ball, (6) is a metal ball (6), and itself (
4) is attached to the shaft rod, (7) is the spring that connects the box body (4) and the metal ball (5), (1 (1 is the spring fixing part).

The metal ball (5) is moved by the shaft (6) and spring (7) into (b) and ? in the p diagram. It is movable only in the + direction, and when the metal ball (5) moves, the restoring force of the spring (7) causes the metal ball to return to its initial position.

FIG. 3 is a principle diagram illustrating that the spin-type artificial satellite platform of the present invention has a function of maintaining the spin rates of nine artificial satellites at nominal values. In the figure, (1) is the satellite body.

(3) is the spin axis, (4) is the box, (5) is the metal ball, (
7) is the spring, (A) is the direction of spin, Qll is the centrifugal force exerted on the metal ball by the spin, and Q3 is the direction of the metal ball (5).
), Ll is the length of the arm of the moment of inertia around the spin axis (3) from the center of failure of the platform (8) to the center of mass of the metal ball (5), and the spin rate is the nominal value. Suppose that it is set on the ground so that it has a length of Ll. Now, if there is a mistake in the actual design of the 9th satellite, and the spin rate exceeds the nominal value, the centrifugal force circle exerted on the metal ball by the satellite's spin will increase, and the metal ball (5) will Move to the right in the diagram. That is, the length of LL becomes longer. As the length of Ll increases, the moment of inertia around the spin axis (3) increases, and a torque is generated in the direction that decreases the spin rate, that is, in the opposite direction to the spin direction (bi), and the spin rate becomes nominal 1. Decrease as if being pulled back. When the spin rate deviates from the nominal value and becomes smaller, a torque that is opposite to the above, that is, increases the spin rate, is generated, and the spin rate returns to the nominal value.

Figure 4 shows the relationship between the spin rate, the torque around the spin axis, the mass of the metal ball (5), and the spin of the satellite.
5) and the centrifugal force and centripetal force applied to @body (4) and metal ball (
5) shows the relationship between the tensile force of the spring (7) attached to the spring (7).

In the figure, (3) is the spin axis, (4) is the box body, (
5,) is the metal ball when the spin rate is the nominal value, (
sb) is the metal ball when the spin rate exceeds the nominal value, (7a) is the spring installed in the two-box body (4) that is closer to the center of the platform it, (7b) is the opposite side to the center of platform mass The spring on the side, (8) is the trading center of the platform, (lla) is the centrifugal force exerted on the metal ball (5a) when the spin rate is at the nominal value, and (11b) is when the spin rate exceeds the nominal value. (12a) is the centripetal force that the metal ball (5a) receives when the spin rate is at the nominal value, (12a) is the centripetal force that the metal ball (5b) receives when the spin rate is at the nominal value.
d) is the centripetal force that the metal ball (5b) receives when the spin rate exceeds the nominal value. In addition, H) in Figure 1 is the spin direction, N) is the torque acting in the direction that tries to prevent an increase in the spin rate, and xI is the length of the spring (7a) near the platform mass center when the spin rate is at the nominal value. S, x, is the length of the spring (7a) near the platform mass center when the spin rate exceeds the nominal value, and Ll is the spin axis (3) of the metal ball (5a) when the spin rate is the nominal value. The length of the arm of the moment of inertia, L2 is the length of the arm of the moment of inertia of the metal ball (sb) around the spin axis (3) when the spin rate exceeds the nominal value.

When the spin rate reaches the nominal value, the metal ball (5a
) is connected in the direction connecting the plug form negative electric center (8) and the metal ball (5a) by the spring (7a) near the platform it center (8) and the spring (7b) on the opposite side to the platform mass center (8). under the tension of an equal spring.

At this time, centrifugal force (tZa) and centripetal force (tZa) are equal in magnitude and act in opposite directions, so they remain stationary within one box (4).In other words, when the spin rate is at the nominal value The centrifugal force (11-) exerted on the metal ball and the centripetal force (11-) exerted on the metal ball when the spin rate exceeds the nominal value
2a) are equal in size and opposite in direction, and metal balls (53)
The center of is the length L from the platform debt center (8)
The length of the spring near the center of mass of the platform at this time is X.

Now, suppose there is a mistake in the lXX characteristic design of one artificial satellite.
Assume that the spin rate exceeds the nominal value. The metal ball (5a) when the spin rate is at the nominal value is
Due to the increase in centrifugal force due to the increase in spin rate, the spindle moves to the position (5b) in FIG. 4. At this time, compared to when the spin rate was at the nominal value using the device of the present invention.

A new power is added. That is, when the spring constants of the spring (7a) near the platform mass center and the spring (7b) on the opposite side of the platform mass center are both k, 2 X kX (z, -z, )...
A force of magnitude +11 is applied from the metal ball (5b) to the platform 'J [at the center (8
) direction. Also, if the value of the metal ball (5) is m and the nominal value of the spin rate tl''Wl is the value when the spin rate increases, then the increase in the centrifugal force applied to the metal ball is m x (L2 XW' -Lx x w) ・・
・・・−・・−=−(2) That is, the centrifugal force (1 tb
) and the centrifugal force (ll) when the spin rate reaches the nominal value
The difference in size of a) is expressed by the above equation (2). +11 formula and (
2) The equations have equal magnitude and opposite directions.

2XkX(xy-xl)=mx(Lzxy'-Ll
xy)...ta+. In Figure 4, Lx(
Lz, and even if the spin rate increases, the metal ball (5
) does not change, so as the spin rate increases, the center of the platform (8) around the spin axis (3)
The moment of inertia arm that connects the metal ball (5) to the metal ball (5) becomes longer, and the moment of inertia around the spin axis becomes larger.

The increase in the moment of inertia about the spin axis causes a torque () about the spin axis (3) that tries to prevent the spin rate from increasing, and the spin rate is maintained at the nominal value. When the spin rate deviates from the nominal value and becomes smaller, a torque opposite to the above torque is generated based on the same principle as above, and the spin rate is maintained at the nominal value of I-1.

In addition, the reason why the material is limited to the gold M sphere (5) tl-" of the m component is to prevent damage to equipment due to the influence of charge and discharge from the satellite by using a highly conductive material. But, 41!
It's fine as long as it's sexual.

〔Effect of the invention〕

As described above, according to the present invention, the spin rate of a spin-type artificial satellite can be maintained at a nominal value.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the spin-type artificial satellite of the present invention.
FIG. 2 shows the spin rate v? according to this invention. 4! Figures 3 and 4 showing the I mechanism are diagrams for explaining that the present invention has a function of maintaining the spin rate of a spin-type artificial satellite. In the figure, (1) is the satellite body, (2) is the platform, (3) is the spin axis, (4) is the box body, (51 is gold J
(6) is a shaft rod, (7) is a spring, and (9) is a spin rate A adjustment mechanism. Note that in FIG. 1, the same reference numerals indicate the same or corresponding parts. 11th! 1 5: Metal work clothes

Claims (1)

[Claims] a box body provided in a platform and located equiradially from the platform mass center; a sphere attached to the box body via an axis rod and movable along the axis rod; and a sphere provided on the axis rod. , a plurality of spin rate adjusting mechanisms are provided around the satellite spin axis of the platform, each of which includes a spring connecting each of both ends of the box and the sphere, and acts to maintain the spin rate at a nominal value; A spin-type artificial satellite characterized by