CN105628303A - Cubesat centroid measurement method - Google Patents

Abstract

The invention discloses a cubesat centroid measurement method. Firstly a rectangle support is arranged on four directions of each of a side surface and a bottom surface out of a main body framework of a cubesat, and electronic scales are arranged on a support bottom part to read the readings. Then a centroid deviation direction is judged by comparing the sum of the readings of the two electronic scales on the same side with the sum of the readings of the two electronic scales on the other side on the same surface. Finally a specific position of the centroid is determined according to a moment balance principle. The measurement method of the invention is easy to operate, required devices are extremely simple, and thus the measurement cost is low. The measurement method of the invention has high adaption, and is suitable for CubeSats of any unit.

Description

Cubes satellite centroid measurement method

Technical field

The invention belongs to a cube star technical field, particularly a kind of cubes satellite centroid measurement method.

Background technology

In recent years, with the fast development of the science and technology such as communication, sealed cell, material, sensor, applicating fluid, a cube star technical development is significantly accelerated, and utilization cube star carries out remote measurement, test becomes possibility. Cheap cost has impelled emerging in large numbers of cube star development effort within the scope of the world.

Satellite attitude tool is had a significant impact by satellite barycenter, and centroid motion can cause celestial body attitude to fluctuate, and satellite is mainly contained the impact of several aspects by the fluctuation of celestial body attitude:

1, reduce satellite attitude accuracy, thus reduce military service quality;

2, when gesture stability is Active control, extra fluctuation increases appearance control energy consumption;

3, when attitude topworks adopts flywheel mechanism, fluctuation will make flywheel bear periodically moving load, reduce the operating performance and life-span that support;

4, when gesture stability topworks is jet thruster, fluctuate increase thruster on-off times and open the time, extra increase working medium consumption, thus reduce satellite service life.

Therefore, when satellite overall design all can the position of special concern satellite barycenter, carry out necessary counterweight process, avoid centroid motion and satellite is had a negative impact. Cubes design of satellites specification (CubesatDesignSpecifications) clear stipulaties cube star barycenter need to drop within the centre of form 2 centimetres of sphere. And the prerequisite work of satellite counterweight is exactly the measurement of barycenter.

Patent of invention 201410691004.9 discloses a kind of centroid measurement method: under using free suspension state, object hangs the ultimate principle that center of gravity crossed by line, by the measurements and calculations machine modeling to the outstanding line under different free suspension state, testee geometric space profile, matching testee profile model, resolve center of gravity plummet intersection point, find object position of centre of gravity. The method is usually used in the centroid measurement of the non-homogeneous irregular large satellite of profile, but cube star profile rule, and physical dimension is little, it is very difficult to point of tangent is set, the method therefore can not be used to carry out centroid measurement.

Summary of the invention

It is an object of the invention to provide a kind of use simple, the cubes satellite centroid measurement method that measuring accuracy is high.

The technical solution realizing the object of the invention is:

A kind of cubes satellite centroid measurement method, comprises the following steps:

Step one: the four direction of a side outside the main structural frame of cubes satellite and a bottom surface arranges and surrounds rectangle and support respectively, and arranges electronic scale to read reading in support base;

Step 2: by the same face with two the electronic scale readings in side and with another two electronic scale readings in side with multilevel iudge barycenter be partial to direction;

Step 3: according to principle of moment balance, it is determined that the particular location of barycenter.

The present invention compared with prior art, its remarkable advantage:

(1) the cubes satellite centroid measurement method processing ease of the present invention, required equipment is also extremely simple, therefore measures with low cost.

(2) the cubes satellite centroid measurement method applicability height of the present invention, is applicable to cube star of any unit.

Below in conjunction with accompanying drawing, the present invention is described in further detail.

Accompanying drawing explanation

The system of coordinates that Fig. 1 is cubes satellite centroid measurement method of the present invention determines figure.

Fig. 2 is the schematic diagram of perforate on cubes satellite centroid measurement method main structural frame of the present invention.

Fig. 3 is the structural plan adopted of cubes satellite centroid measurement method of the present invention.

Fig. 4 is the structural plan adopted of cubes satellite centroid measurement method of the present invention.

Embodiment

Composition graphs 1��Fig. 4:

A kind of cubes satellite centroid measurement method of the present invention, comprises the following steps:

Step one: the four direction of a side outside the main structural frame of cubes satellite and a bottom surface arranges and surrounds rectangle and support respectively, and arranges electronic scale to read reading in support base;

Step 2: by the same face with two the electronic scale readings in side and with another two electronic scale readings in side with multilevel iudge barycenter be partial to direction;

Step 3: according to principle of moment balance, it is determined that the particular location of barycenter.

Wherein, step one comprises the following steps:

Step 1 a: side outside the main structural frame of cubes satellite and four holes surrounding rectangle are set on a bottom surface respectively;

Step 2: support four on one of them face hole with four thimbles respectively;

Step 3: electronic scale is set respectively in the bottom of each thimble simultaneously, and reads electronic scale reading.

Embodiment:

A kind of cubes satellite centroid measurement method is specific as follows:

(1) as shown in Figure 1, the flight direction setting up cube satellite is+x direction, and the reverse direction of flight is-x direction, cubes satellite be+z to direction, sky, to place to being-z, determine+y and-y direction by right hand spiral law;

As shown in Figure 2, (2)+y direction outside the main structural frame of cubes satellite to face and-x direction to face on four holes surrounding rectangle are set respectively;

(3) four on one of them face hole is supported with four thimbles respectively;

(4) electronic scale is set respectively in the bottom of each thimble simultaneously, and reads electronic scale reading;

(5) set centroid position as (x₀, y₀, z₀), the support+y direction obtained by structural arrangement as shown in Figure 3 more to face obtain four electronic scale readings, if the reading of four electronic scales is respectively m₁��m₂��m₃��m₄, then the total mass m of cube star is m=m₁+m₂+m₃+m₄; If m₁��m₂It is in-x to, m₃��m₄Be in+x to, the deflection of barycenter in x-axis can be judged by comparing m1+m2 and m3+m4 size,

If m₁+m₂> m₃+m₄, then x₀Deflection-x;

If m₁+m₂< m₃+m₄, then x₀Deflection+x.

According to principle of moment balance, in plane xoz, oz axle is got square, x can be obtained₀For:

$x_o=\&PlusMinus;\frac{1}{mg}(m_1{\mathrm{gx}}_1+m_2{\mathrm{gx}}_2-m_3{\mathrm{gx}}_3-m_4{\mathrm{gx}}_4)$

As barycenter deflection-x, upper formula gets positive sign;

As barycenter deflection+x, upper formula gets negative sign.

(6) support-x direction obtained by structural arrangement as shown in Figure 4 more to face obtain four electronic scale readings, adopt such as the method for step (5), respectively axle oy, oz got square and can determine y₀��z₀��

Claims (2)

1. a cubes satellite centroid measurement method, it is characterised in that: comprise the following steps:

Step one: the four direction of a side outside the main structural frame of cubes satellite and a bottom surface arranges and surrounds rectangle and support respectively, and arranges electronic scale to read reading in support base;

Step 2: by the same face with two the electronic scale readings in side and with another two electronic scale readings in side with multilevel iudge barycenter be partial to direction;

Step 3: according to principle of moment balance, it is determined that the particular location of barycenter.

2. cubes satellite centroid measurement method according to claim 1, it is characterised in that: described step one comprises the following steps:

Step 1 a: side outside the main structural frame of cubes satellite and four holes surrounding rectangle are set on a bottom surface respectively;

Step 2: support four on one of them face hole with four thimbles respectively;

Step 3: electronic scale is set respectively in the bottom of each thimble simultaneously, and reads electronic scale reading.