JPS6120402A - Stabilizer device - Google Patents

Abstract

PURPOSE:To stabilize an object to be stabilized, by providing a weight as one body and also so as to be movable on the object to be stabilized, and avoiding an undesired resonance phenomenon by moving this weight, when an oscillation angle of the object to be stabilized has exceeded a prescribed value. CONSTITUTION:An antenna 1 serving as an object to be stabilized is supported by a support 3 through a universal joint 2. The support 3 is fixed to an oscillating body such as ships, etc. On the lower part of the antenna 1, a weight 4 is provided as one body with the antenna and also so that the center of gravity of the whole body containing the antenna 1 becomes lower than the center of the universal joint 2. A supporting shaft 5 which passes through this weight 4 and is suspended is constituted so as to be rotated by a driving force of a driving source 6, and spiral grooves which are engaged with each other are formed on the weight 4 and the supporting shaft 5 so that the weight 4 moves up and down. This supporting shaft 5 is rotated by a fact that on-off of the driving source 6 and the rotational direction are controlled by a signal from a detector 7 which is provided on the universal joint 2 and detects an oscillation angle of the weight 4 functioning as a pendulum.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a stabilizer device used, for example, in the antenna section of marine satellite communication equipment. [Technical Background of the Invention and Problems thereof] Marine satellite communication equipment , it is necessary to direct the aerial MK ship toward the satellite regardless of the oscillation of the aerial MK ship that transmits and receives data to and from the satellite. For this purpose, the antenna is installed on a platform provided via a strut trap universal joint, for example a universal joint, fixed to the ship.

If more precise stabilization is to be performed, the platform is provided with, for example, a gyro device to absorb unnecessary torque. Although this stabilization method using a gyro device or the like allows for more precise stabilization of the platform, it is not suitable for small ships because it has many components and the entire device becomes large. Furthermore, if the antenna beam width is wide and the antenna does not cause any practical problems even if the antenna oscillates to some extent, a method is used in which a weight is provided integrally with the antenna and stabilization is achieved using a pendulum with a universal joint as the fulcrum. This method has a simple configuration and can be applied to small ships. In this method, a weight is fixedly provided so that the center of gravity of the entire unit including the antenna is located below the axial center of the universal joint. Therefore, when such a stabilizer device is mounted on a ship, the weight also makes a pendulum movement using the universal joint as a fulcrum in response to the movement of the ship. At this time, the swing angle θ of the weight
However, if it is always within the allowable range while the ship is moving, there will be no practical problem. However, when the weight is fixed, the mechanical resonance frequency of the pendulum is constant because the length from the pendulum's fulcrum (axis center of the universal joint) to the center of gravity is constant, and the period of the ship's oscillation is the same as that resonance period. When they match, a resonance phenomenon occurs in which the swing angle of the pendulum increases. That is, when a state occurs in which the oscillation period of the ship almost matches the resonance period of the pendulum, the oscillation angle θ, which was within the permissible range (up to that point), increases or diverges, and it no longer functions as a stabilizer device.

Therefore, it is necessary for K to avoid this resonance phenomenon in order to maintain good communication with the satellite.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned circumstances, and it is an object of the present invention to provide a stabilizer device that can avoid the resonance phenomenon of the pendulum and constantly strive for stabilization.

[Summary of the invention]

The stabilizer device according to the present invention has a weight integrally and movably attached to an object to be stabilized, such as an antenna, and when the swing angle of the object to be stabilized exceeds a predetermined value, the weight is moved to eliminate undesirable effects. This is to avoid resonance phenomena.

[Detailed description of the invention]

An embodiment of the stabilizer device according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram illustrating an embodiment of a stabilizer device according to the present invention.

An antenna (1) as an object to be stabilized is supported from a column (3) via a universal joint (2), for example. The column (3) is fixed to a moving body such as a ship. At the bottom of the aerial wire (1), there is a weight (4) in the air! [
1) and provided so that the entire center of gravity including the antennas (i) and t is below the center of the universal joint (2).

This weight (4) is configured to be rotated by the driving force of a drive source (6) and a support shaft (5) which is suspended through the entire weight (4), and this rotation causes the weight (4) to move up and down. ) and the support shaft (5) are formed with spiral grooves that mesh with each other. The rotation of this support shaft (5) is controlled by the universal joint (2).
0N-O of the drive source (6) by the signal from the detector (7) which is installed in the
This is done by controlling the FF and rotation direction.

It should be noted that the entire support shaft (5) of the transmitting/receiving circuit unit (8) for transmitting and receiving signals via the antenna (fl) may be configured to have a function as a weight.

Now, when a disturbance is applied to the stabilizer device having such a trap configuration due to the shaking of the ship, the center of gravity of the entire body including the antenna (1) etc. is below the center of the universal joint (2), so the antenna (1) , the support shaft (5), the weight (4), etc., which are integrally constructed, make a pendulum movement using the universal joint (2) as a fulcrum. The period of this camera movement is determined by the length from the fulcrum to the center of gravity, and the farther the center of gravity is from the fulcrum, the shorter the period. Furthermore, if the center of gravity coincides with the fulcrum, the period will be infinite in principle, and there will be no pendulum movement in response to the rotational force around the fulcrum. However, in reality, since there is friction in the universal joint (2) as a fulcrum, when a disturbance is applied, the support shaft (5)
) may become stable in a diagonal direction different from the vertical direction. In order to avoid this, the center of gravity is made with a universal joint (
2) It is set lower so that it has a restoring force so that the pendulum part does not become unstable in diagonal directions. Therefore, when there is a disturbance, pendulum movement occurs, but as long as the swing angle θ is always within the allowable range that allows communication with the satellite due to the relationship with the antenna beam radiation, there will be no practical problem.

However, in reality, the relationship between the oscillation period T as a disturbance and the deflection angle θ is as shown, for example, by the solid line in FIG. 2, and the deflection angle θ has a steep peak at a certain oscillation period T'. That is, when the swing period T substantially matches the mechanical resonance period of the pendulum, the swing angle θ of the pendulum increases extremely, the swing of the antenna becomes large, and communication with the satellite becomes impossible.

In the stabilizer device according to the present invention, when #1 is subjected to a vibration that coincides with the mechanical resonance period of the pendulum, the weight (4)
automatically moves and the mechanical resonance period of the pendulum changes to, for example, the second
It operates to deviate as shown by the broken line in the figure.

That is, the swing angle θ of the pendulum is detected by a detector (force, for example, a potentiometer) provided at the universal joint (2) K, and when the swing angle θ becomes, for example, a predetermined value θ' or more, the drive source (6) is activated by the output voltage of the potentiometer. is driven by the support shaft (5)
Since the support shaft (5) and the weight (4) that rotate the 0 support shaft (5) and the weight (4) are formed with spiral grooves that mesh with each other, the support shaft (5)
As the weight (4) rotates, the weight (4) moves upward or downward. Due to this movement of the weight (4), the resonance period of the pendulum moves, for example, as shown by the broken line in Figure 2, and even if an oscillation with an oscillation period T' is applied, no resonance phenomenon occurs and the swing angle θ is set to an angle that does not cause any practical problems. can be maintained within θ'.

The weight (4) is moved every time the deflection angle θ' is detected by the detector (7). 7) If the output is reversed and the support shaft (5) is rotated in the opposite direction every time there is a force output from the detector, it is effective to move the weight (4) repeatedly. .

FIG. 3 is a schematic diagram illustrating another embodiment of the stabilizer device according to the present invention. The embodiment shown in FIG.
This is the embodiment shown in Figure 1 with the addition of a universal joint (9), drive source 0 [, support shaft (11), and weight 02], and the same parts as in Figure 1 are given the same numbers and explained. Omitted.

That is, this embodiment has double pendulum parts each composed of weights connected via a universal joint, and each of the pendulum parts makes a pendulum movement independently. In this case, the vibration period T as a disturbance and the deflection angle θ (detector (7
) The relationship with the detection angle (detected angle by K) is as shown, for example, by the solid line in FIG. 4, and the swing angle θ has a steep peak at different swing periods T' and T//. In this case too, the detector (7
), when the swing angle θ' is detected, by moving at least one of the weight (4) and the weight α2, the mechanical resonance period of the pendulum can be shifted as shown by the broken line in Fig. 4. Undesirable resonance phenomena can be avoided.

Note that a detector may be provided in the universal joint (9) and the output of this detector may be used to move the weight a7J.In addition, in the above embodiment, K is used to detect not only the deflection angle but also the vibration period. By doing so, it is possible to perform the function only in response to a specific periodic disturbance, and it is possible to prevent malfunctions in response to aperiodic and sudden disturbances.

In addition to the method described above, there are various ways to move the weight (4), such as sliding a weight placed on a rail, and the method is not limited to one method. Instead of using a specially provided weight for movement, the circuit unit (8) may be configured to be moved as a weight means.

〔Effect of the invention〕

As explained above, according to the stabilizer device according to the present invention, undesirable resonance phenomena can be avoided and the object to be stabilized can always be stabilized, which has great practical effects◇

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram illustrating one embodiment of the stabilizer device according to the present invention, FIG. 2 is a diagram illustrating the entire operation of the device shown in FIG. 1, and FIG. 3 is another embodiment of the stabilizer device according to the present invention. FIG. 4 is a diagram illustrating the operation of the apparatus shown in FIG. 3. 1... Aerial wire, 2... Universal joint, 3... Support column, 4
... Weight, 5... Support shaft, 6... Drive source, 7...
Detector. Agent Patent attorney Noriyuki Chika (and 1 other person) 77 figures 1 side T/Dobutsu Shu MT χ31 ¥l χ41 sword

Claims (1)

[Claims] a support means fixed to the moving body; a stabilized object disposed on the support means via a universal joint; and a stabilized object suspended from the stabilized object and movable to a position spaced a predetermined distance from the universal joint. A stabilizer device comprising: a weight means provided in the stabilized object; and means for detecting a swing angle of the object to be stabilized and moving the weight means when the swing angle becomes equal to or greater than a predetermined value.