JPS63125841A - Fly wheel - Google Patents

Abstract

PURPOSE:To attenuate resonance amplitude peak by providing a vibration restraining member forming a vibration restraining layer and a restricting member forming a restricting layer on a coupling member for coupling a fly mass body with a bearing device. CONSTITUTION:A coupling member 13 is provided to coupling a fly mass body 11 made of a fly wheel 10 with a bearing device 12. To the coupling member are secured fixedly vibration restricting layer forming members 14, 16 consisting of vibration restricting resin layers resenting vibration restricting action. Also, on these members 14, 16 are further secured fixedly restricting layer forming members 15, 17 made of laminated restricting plates. When an exciting force acts periodically on the fly mass body 11 from the exterior, the deformation of vibration restraining layers 14, 16 caused by the displacement of coupling member 13 is restricted by the restricting layers 15, 17 to generate the shear deformation of vibration restraining layer and absorb vibrational energy.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a flywheel used for attitude control of an artificial satellite, and in particular, to a flywheel used for attitude control of an artificial satellite. The present invention relates to a flywheel that prevents bearing damage by reducing frictional torque and enables the use of small bearings to reduce frictional torque.

The present invention aims to reduce this bearing load, eliminate damage to the bearing due to load peaks, and enable the use of a bearing as small as possible with a low rated load, thereby reducing the friction torque during rotation of the bearing.

Furthermore, this is achieved without degrading the original performance of the flywheel, such as by causing dynamic imbalance.

[Prior art] The flywheel loaded onto an artificial satellite vibrates due to the excitation force generated by the rocket during the satellite's launch, and at the resonance amplitude peak, an extremely large load peak is applied to the bearing that rotatably supports the flywheel. arise. Conventionally used methods for damping the resonance amplitude peak of a flywheel include 1) a method using Coulomb friction force 2, a method 3 that limits the amplitude by collision, and a method using a vibration absorber.

For example, there are flywheels shown in FIGS. 3 and 4 that have been put to practical use using a method using Coulomb friction force. That is, in FIGS. 3 and 4, the flywheel includes a flywheel mass 1, a bearing device 2, a coupling member 3, a vibration damping member 4,
The vibration damping member 4 has a ring shape, for example, and the two vibration damping members 4 from above and below sandwich the coupling member 3. It has a structure in which it is tightened by a tightening screw 5.

When a periodic excitation force is applied from the outside and a resonance amplitude peak occurs, the coupling member 3 and the vibration damping member 4 are able to move slightly relative to each other, and the vibration is damped by Coulomb friction force. ing.

This flywheel has a shape in which mass is concentrated in a flywheel mass body 1 having a large radius from the rotation axis in order to maximize the inertia/weight ratio around the rotation axis. Therefore, when a resonance state occurs, the amplitude of the tips of the bouncy mass 1 and the coupling member 3 increases, and a relative motion occurs between the coupling member 3 and the vibration damping member 4, so that the Coulomb friction force of equation (1) acts. It is something.

F=μN... (1) Here,
F: Coulomb friction force, μ: Dynamic friction coefficient, N: Vertical pressure generated between the coupling member 3 and vibration damping member 4 when the tightening screw 5 is tightened.Since vibrations are applied periodically, the friction force also changes, Vibration energy is converted into thermal energy and damped.

Next, as a flywheel using a method of limiting the amplitude by Coulomb friction force and collision, for example, JP-A-57-17
There is one disclosed in Japanese Patent No. 9452.

As illustrated in FIG.
The bearing device 31 constitutes a spring mass body of m, which is coupled to a bearing device 31.

By having two spring-mass systems, the flywheel has two different resonance frequencies fLf as shown in FIG.
2 occurs. Vibration damping is performed by the Coulomb friction force acting between the flywheels 33 and 34 due to the difference in amplitude between the flywheels 33 and 34 at their respective resonance amplitude peaks. It is also possible to limit the amplitude peak from the collision of the flywheels 33 and 34.

In this case, the Coulomb friction force acts between the two bouncing masses. Furthermore, the bouncing masses are made to collide with each other, and the impact action limits the resonance amplitude peak. .

[Problem that the invention seeks to solve]

The conventional flywheel is configured as described above, so
There are the following problems.

1. The former type of damping due to Coulomb friction requires relative frictional movement of the members, and it is necessary to allow minute movements between the members. Therefore, after the resonance amplitude peak occurs due to the vibration caused by the rocket during the launch of the artificial satellite, the relative position shifts slightly and the dynamic balance of rotation, which has been precisely adjusted, is disrupted. As a result, (a) the angle at which the rotation axis swings (wobble angle) is increased, which worsens the attitude stability of the satellite.

(b) The rotational life of the bearing is shortened because the load on the bearing is increased.

2. In the latter case, dust is generated due to relative frictional motion and collision impact, which is particularly unfavorable in terms of bearing reliability.

Therefore, the present invention aims to solve the above-mentioned problems.
This reduces the load on the rotating bearing by attenuating the resonance vibration peak, and even after the excitation force is applied, there is no increase in rotational vibration due to dynamic unbalance, which also affects the service life and reliability. The purpose is to obtain a flywheel that does not cause

[Means for solving problems]

In view of the above-mentioned objects of the invention, the flywheel according to the present invention includes a vibration damping layer forming member on the coupling member that couples the rotary bearing and the flywheel mass in order to reduce the resonance amplitude peak and reduce the load on the bearing. The damping layer forming member is attached to the damping layer and the vibration is damped by shear deformation of the damping layer, and the damping layer forming member is fixedly attached to the coupling member, and the constraining layer is further fixedly attached on top of the coupling member, so that the resonance amplitude is reduced. Even after a peak occurs, the damping layer forming member and the constraining layer forming member are prevented from being misaligned with each other.

The rotary vibration damping method in the present invention is such that the displacement of the coupling member at the resonance amplitude peak caused by the excitation force is restrained by the shear deformation of the damping layer, thereby damping the vibration and reducing the load applied to the rotary bearing. It is something to do.

In addition, the coupling member, damping layer forming member, and restraining layer forming member are fixed to each other so that they do not shift due to vibration, and can rotate with small vibration even after resonance. The fixing method is an adhesive method using an adhesive.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. FIG. 1A shows a preferred embodiment of the flywheel according to the present invention, and in FIG. 1A, the flywheel 10 is equipped with a flywheel mass 11 consisting of a rim or a motor rotor, and a pair of upper and lower rotation bearings 18,19. A bearing device 12;
A connecting member 13, which is provided to connect the flywheel 10 and the bearing device 12 and is composed of a plurality of spokes or disks, is provided as a basic structural element, and is fixed on the connecting member 13 to exhibit a vibration damping effect. A damping layer forming member 14.16 made of a damping resin layer and a restraining layer forming member 15.17 made of a restraining plate are further fixed in a layered manner on top of these damping layer forming members 14.16. There is.

The flywheel 10 is rotatably supported around a column 20 via bearings 18, 19 of a bearing arrangement 12. Also, although not shown in the figure, the flywheel mass 1 of the flywheel lO
Needless to say, a drive source for driving the bearing device 1 to rotate around the axis of the bearing device 12 is provided.

Figure 2 shows the coupling member 13 and damping layer forming members 14 and 16.
15 is a partial view showing a state of shearing deformation occurring between the restraining layer forming members 15 and 17; An excitation force acts in the direction, and the flywheel 1
0 is in a resonant state, the resonance amplitude peak becomes the largest at the radial tip of the bouncy mass body 11 and the coupling member 13 where most of the mass is concentrated, and the acceleration of that part and the mass of the bolus mass body 11 are approximately equal to each other. A force multiplied by the above will be applied to the bearing device 12 as a load.

In order to reduce this load, a damping layer forming member 14.16 is provided at the tip of the coupling member 13 where the amplitude increases during resonance.
Two sets of the restraining layer forming members 15 and 17 are fixedly attached on substantially both sides of the axis of the bearing device 12 by an adhesive method using an adhesive, and the restraining layer forming members 15 and 17 are used to connect the vibration damping layer forming member 14. By restraining the expansion and contraction of .16, the end portion 14a of the vibration damping layer forming member 14.
.

16a to cause shear deformation, vibration energy is converted into thermal energy, and the thermal energy is transferred to the coupling member 13.
This is intended to reduce vibration by conducting and dissipating heat. In addition to ordinary metal materials and non-metallic materials, the coupling member 13 can be made of a damping alloy having a function of damping vibrations, a fiber reinforced composite material (for example, 5iC (whisker)/A1 alloy), etc. According to this, the vibration damping effect is further increased.

Furthermore, by using damping resin to form the damping layer forming members 14 and 16, the coupling member 13 and the restraint Ji15.
17 can be adhesively bonded, so even after a resonance condition occurs, no positional deviation occurs between the coupling member 13, the damping layer forming members 14, 16, and the constraining layer forming members 15, 17, and therefore the dynamic balance of rotation is maintained. It is maintained.

FIG. 1B is a three-dimensional illustration of the embodiment of the flywheel of FIG. 1A, showing that the flywheel 10 is generally cylindrical. and damping layer forming member]4.
It can be seen that the restraining layer forming members 16 and 15 and 17 are annular members. However, this is just one embodiment, and it goes without saying that the present invention is also applicable to embodiments in which the flywheel 1o does not have a cylindrical shape.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the resonance amplitude peak can be reduced by installing a control member preferably attached by an adhesive method using an adhesive on the coupling member between the monolithic mass body and the bearing device. Since this is achieved through energy conversion through shear deformation of the vibration layer forming member and the restraining layer forming member, there is no rotational unbalance after resonance, and the performance as a rotating inertial body is improved.
A flywheel with improved lifespan and reliability can be obtained.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional view of a flywheel according to an embodiment of the present invention, FIG. 1B is a partially cutaway three-dimensional view of the same embodiment, and FIG. 2 is a damping layer forming member forming the main part of the present invention. FIG. 3 is a partial cross-sectional view for explaining vibration damping due to shear deformation caused by the interaction between the flywheel and the constraining layer forming member. 4 is a partially enlarged sectional view showing the structure of the vibration damping device for the flywheel shown in FIG. 3, FIG. 5 is a vertical sectional view showing another example of the conventional flywheel, and FIG. 5 is a graph diagram explaining that the flywheel shown in FIG. 5 has two resonant frequencies. FIG. 10... flywheel, 11... fly mass body, 12.
...bearing device, 13...coupling member, 14.16...
Damping layer forming member, 15.17... Constraining layer forming member, 18.19 Rotating bearing, 20... Support column. Flute 1B Figure 2 Figure 3 Figure 4 Ro':”, + 5 Mouth Rei Figure 6

Claims (1)

[Claims] 1. A bouncy mass, a bearing device provided at the center of rotation of the bouncy mass, a coupling member that couples the bouncy mass to the bearing device, and a resonance amplitude generated at a resonance frequency. In the flywheel, the flywheel is equipped with vibration suppressing means for reducing the load on the bearing device due to peaks, the vibration suppressing means comprising:
The spring mass body is configured to include a damping member fixed on the coupling member to form a damping layer, and a restraining member fixed on the damping layer to form a restraining layer. When an excitation force is applied periodically from the outside, deformation of the damping layer due to displacement of the coupling member is restrained by the restraining layer, causing shearing deformation of the damping layer, and absorbing vibration energy. A flywheel characterized in that the resonance amplitude peak is attenuated by. 2. The flywheel according to claim 1, wherein the vibration suppressing means is formed by fixing at least one set of a damping layer forming member and a restraining layer forming member to the coupling member. 3. The flywheel according to claim 1, wherein the damping layer is formed of a damping resin material, so that the coupling member and the constraining layer forming member are adhesively bonded to each other. 4. The flywheel according to claim 1, wherein the coupling member is made of a damping alloy material having a vibration damping function. 5. The flywheel according to claim 1, wherein the coupling member is made of a fiber-reinforced composite material having a vibration damping function.