JP2792667B2 - Vibration suppression device for plate-like flexible structures - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vibration suppressing device for suppressing vibration of a plate-like flexible structure such as a solar cell panel.

2. Description of the Related Art As an example of a conventionally known vibration suppressing device for a plate-like flexible structure such as a solar cell panel for artificial hygiene, see, for example, JP-A-60-15300.
Is disclosed in Japanese Patent Publication No. In this device, an actuator for rotating the hinge according to a detection signal of the rotation angle is provided on a hinge of the solar cell array, and the actuator has a function of damping the rotation of the hinge to prevent the occurrence of vibration of the solar cell array. Things.

[Problems to be Solved by the Invention] The prior art of the vibration suppressing device for a plate-shaped flexible structure such as the solar cell array for artificial hygiene described above is, as shown in the latter publication, rotated to a hinge portion. Although a detector such as an encoder for detecting an angle and an actuator are provided to suppress the vibration of the plate-like flexible structure around the hinge portion, it does not suppress the bending deformation vibration of the plate-like flexible structure itself.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration suppressing device which is small and lightweight and suppresses bending vibration of a plate-shaped flexible structure itself.

[Means for Solving the Problems] The plate-like flexible structure vibration control device of the present invention has the structural features described in claims 1 to 4, respectively.

[Operation] The vibration control device for a flexible plate-like structure according to the present invention has an effect that, when a slight curvature is applied to the flexible plate-like structure by an actuator means, its bending rigidity is increased and vibration is suppressed. We are using.

[Embodiment] First, a displacement conversion device according to a preceding example, which was researched and developed by the present inventors prior to the present invention, will be described in principle with reference to FIG.

As shown in FIG. 1, one end of the elastic thin plate 1 is restrained, and the other end is movably supported as shown, and when a load F is applied from both ends, a bending deformation occurs. At this time, the displacement d at the end of the thin plate 1 and the displacement h at the center of the thin plate have a relationship as shown in FIG. For example, d is the displacement on the input side, and h is the displacement on the output side. Here, if d changes by Δd ₁ shown in the figure, the change of the output displacement h becomes Δh ₁ shown in the figure, and the ratio Δh ₁ / Δd ₁ is larger than 1, thereby obtaining the displacement enlarging function. If d changes by Δd ₂ shown in the figure, the change in displacement becomes Δh ₂ shown in the figure. This ratio Δh ₂ / Δd ₂ is smaller than 1, and the displacement reduction function is obtained. If this means is used, a kind of displacement enlarging (or reducing) mechanism can be realized, and a positioning mechanism can be realized using this mechanism. In this case, the output portion may be a portion near the central portion of the thin plate 1 instead of the central portion, and the relationship between the input displacement d and the output displacement h is determined by the boundary conditions of the end portion, the shape of the thin plate 1, and the rigidity. Depends on etc.

Note that the input portion and the output portion are reversed, that is, a displacement load is applied to the central portion or a portion near the central portion of the thin plate 1 to cause an input displacement in the portion, and the displacement of the end portion of the thin plate 1 is defined as the output displacement. The embodiment described above is also possible.

Some specific embodiments of the small displacement converter according to the preceding example are shown below.

FIG. 3 shows an example. This device is
An elastic thin plate 1 that bends and deforms, a holding portion 2 that rotatably holds both ends of the thin plate 1, a laminated piezoelectric element 3 and a piezoelectric element 3 that are coupled to the holding portion 2 and generate displacement in the direction of arrow B in the drawing. And a power supply unit 5 for applying a voltage to the piezoelectric element 3. In the present device, when no voltage is applied to the piezoelectric element 3, the thin plate 1 has an initial shape which is previously bent like a solid line. When a voltage is applied to the piezoelectric element 3, the piezoelectric element extends by Δd as shown by the dotted line, so that the thin plate 1 is deformed as shown by the dotted line in the figure. Deviates from position. When Δh is larger than Δd, the present device has a kind of displacement enlarging function, and when Δh is smaller than Δd, it has a displacement reducing function. Therefore, if any output section is provided in the portion A, the device becomes a displacement enlarging (or reducing) device.

In this manner, a small and lightweight displacement enlarging (reducing) mechanism can be realized by using the deformation of the thin plate. Δh> Δd
Or Δh <Δd depends on the initial shape given to the thin plate 1 in advance. If the initial shape of the thin plate is nearly flat, Δh> Δd, and if the initial shape is greatly bent, Δh <Δd.

FIG. 4 shows another embodiment of the displacement conversion device according to the prior art. This device is a thin plate that produces bending deformation
11.A movable holding unit that holds each end of the thin plate 11 rotatably.
12 and a fixed holding part 12 ′, which are coupled to the movable holding part 12 and generate a displacement in the direction of arrow B in the drawing.
3, a fixing part 14 for fixing the piezoelectric element 13, a power supply part 15 for applying a voltage to the piezoelectric element 13, and a link 16 which is in contact with or near the center of the thin plate 11 and one end of which is rotatably held. The holding portion 17 includes a spring 18 attached to the link 16 and generating a restoring force toward the thin plate 11. In this device, when a voltage is applied to the piezoelectric element 13, the degree of bending of the thin plate 11 changes, and accordingly, the link 16
Rotate around 17 This device is a displacement conversion device that generates a rotational motion from a translational motion, and can be used as a drive source for opening and closing a gate of an article sorting device.

FIGS. 5 and 6 are a perspective view and a plan view showing an xy stage as an example of a minute displacement adjusting device using the displacement converting device as described in FIG. The present apparatus comprises a fixed base 31, a thin plate 32A, a holding portion 33A for rotatably holding both ends of the thin plate 32A, and a holding portion 33A, and is mounted on the fixed base 31 so as to be able to expand and contract in the x direction. A displacement conversion device comprising a laminated piezoelectric element 34A mounted on the base plate, a displacement conversion device comprising similar elements 32B, 33B, 34B provided on the fixed base 31 opposed thereto, and the thin plates 32A, 32B A movable table 35 which can be moved in the y direction by contacting the movable table 35; a y-direction guide 36 provided on the fixed member 31 for guiding the movable table 35 to smoothly move in the y direction; and a movable table 35 provided on the movable table 35. Thin sheet 41A, thin sheet 4
A holding portion 42A that rotatably holds both ends of 1A, a displacement conversion device including a laminated piezoelectric element 43A attached to the holding portion 42A and mounted on the movable base 35 so as to be able to expand and contract in the y direction, Similar elements provided on movable table 35 facing each other
41B, 42B, 43B, a displacement conversion device comprising the thin plate 41A, 4
A movable table that can be moved in the x direction on the movable table 35 while being in contact with 1B
44, an x-direction guide 45 provided on a movable table 35 for guiding the movable table 44 to smoothly move in the x direction, and a power supply unit for applying a voltage to the piezoelectric elements 34A, 34B, 43A, 43B. 46
And a control unit 48 having an arithmetic unit 47 for performing an arithmetic operation for controlling the applied voltage based on a signal from a position sensor (not shown) for detecting the positions of the movable bases 35 and 44.

In the above apparatus, when a certain target displacement is given to the calculator 47 as a command value, the calculator 47 applies a command signal for applying a voltage to the piezoelectric element to move the movable tables 35 and 44 to the target positions accordingly. To the power supply unit 46. The movable platform can be moved as follows. For example, when moving in the positive x direction, the deformation of the thin plate 41B is reduced by increasing the voltage applied to the piezoelectric element 43A to increase the deformation of the thin plate 41A and lowering the applied voltage of the piezoelectric element 43B. At this time, the movable table 44 abutting on the thin plates 41A and 41B moves in the positive x direction due to the deformation of the thin plates 41A and 41B. The movement in the negative direction of x can be performed by the operation reverse to the above, and the movement in the y direction can also be performed by moving the movable table 35 by the piezoelectric elements 34A, 34B and the thin plates 32A, 32B in the same manner as described above. Can be done with As described above, a small and lightweight minute position adjusting device can be realized, and further, the position can be adjusted to an order smaller than the amount of expansion and contraction of the piezoelectric element.

FIG. 7 is a side view showing one embodiment of the vibration suppressing device for a plate-like flexible structure according to the present invention. This device is
A holding portion 22 for holding one end of a flat thin plate 21 as a plate-shaped flexible structure, a bimorph type piezoelectric element 23 which is coupled to the holding portion 22 and outputs a force for bending and deforming the holding portion 22 and the thin plate 21;
And a power supply 24 for applying a voltage to the piezoelectric element 23. The piezoelectric element 23 ₁ of the bimorph type piezoelectric element 23, 23 ₂ shall stretch or shrink in opposite relation to each other in the illustrated direction C when a voltage is applied. Now, it is assumed that the thin plate 21 is vibrating as shown in FIG. In order to stop this vibration, a voltage is applied to the bimorph type piezoelectric element 23 to slightly deform the thin plate 21 as shown in FIG. Then, the second moment of area of the thin plate 21 becomes large as a whole, and its bending rigidity becomes large, so that it becomes difficult for vibration to occur, and the vibration can be stopped. Thus, a small, simple and lightweight limiting mechanism can be realized. Note that a unimorph type piezoelectric element may be used instead of the bimorph type piezoelectric element.

FIG. 9 shows an embodiment using the above-mentioned vibration damping mechanism. This device is a flexible structure 5 composed of a thin plate or the like, for example, a solar cell paddle deployed in outer space.
1,52, and a hinge 53 that connects the flexible structures 51,52,
An actuator 54 for rotating the hinge 53 and a detector 55 for detecting the hinge rotation angle, such as an encoder
And a bimorph-type or unimorph-type piezoelectric element 56 attached to a part of the flexible structures 51 and 52, and a piezoelectric element 56
And a control unit 59 having an arithmetic unit 58 for performing an arithmetic operation for controlling the applied voltage based on a signal from a vibration detection sensor (not shown) and a vibration of the flexible structure. And a sensor not shown.

The flexible structures 51 and 52 are rotated at hinge locations by the actuator 54 and are deployed as shown in FIG. 7. When the flexible structures 51 and 52 are deployed in this manner, vibration occurs in the thin plates 51 and 52 which are flexible structures. easy. In the present embodiment, when vibration is detected by the vibration detection sensor, the computing unit 58 issues a command signal to the power supply unit 57 to apply a voltage to the piezoelectric element 56. And the piezoelectric element
When a voltage is applied to the piezoelectric element 56, the piezoelectric element 56 and the thin plate are deformed as shown by a dotted line in FIG. Such deformation apparently increases the bending rigidity of the thin plate, so that it is difficult to generate vibration, and the vibration can be suppressed. When the vibration is no longer detected, the voltage application may be stopped.

In the above-described embodiment of the vibration suppressing device of the present invention, a bimorph or unimorph type piezoelectric element is used as an actuator for causing deformation of a thin plate, but this may be another actuator such as bametal or a shape memory alloy. Or, as shown in FIG. 10, a thin plate as a flexible structure
Attaching support members 61 and 62 extending in the transverse direction along the edge of 21 and connecting them by hinges, and providing an actuator 63 for rotating the members 61 and 62 by a small angle around the hinge portion. Alternatively, as shown in FIG.
Flexible support plate extending transversely along the edges of the
An actuator 74 is provided to attach the wires 71, and pull the wires 73a, 73b locked to the pins 72a, 72b planted on the pins 72a, 72b together.
By operating the actuator, the thin plate 21 can be slightly curved to suppress its vibration.

[Effect of the Invention] The plate-like flexible structure vibration suppressing device of the present invention of the present invention has an effect that vibration can be effectively suppressed with a simple and lightweight structure.

[Brief description of the drawings]

FIG. 1 is a diagram showing one basic embodiment of a displacement converter according to a prior example, FIG. 2 is a diagram showing two embodiments of a displacement converter according to a prior example, FIG. 5, FIG. 7 is a perspective view and a plan view of one embodiment of a minute displacement adjusting device based on a prior example, and FIG.
FIG. 8 is a side view and a perspective view showing an embodiment of the plate-like flexible structure vibration suppressing device according to the present invention. FIG. 9 is a perspective view showing an application example of FIG. 10, FIG. FIG. 11 is an end view in partial sectional view showing another different embodiment of the plate-like flexible structure vibration suppressing device of the present invention. DESCRIPTION OF SYMBOLS 1 ... Thin plate 2 ... Thin plate holding part 3 ... Laminated piezoelectric element 4 ... Piezoelectric element fixing part 5 ... Power supply part 21 ... Thin plate 22 ... Thin plate holding part 23 ... Bimorph type piezoelectric element 24 …… Power supply 63 …… Hinge actuator 73a, 73b …… Wire 74 …… Tension actuator

Continuation of the front page (56) References JP-A-63-48608 (JP, A) JP-A-61-176175 (JP, A) JP-A-63-184113 (JP, A) JP-A-61-95586 (JP, A) JP-A-63-262066 (JP, A) JP-A-61-147405 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G05D 3/00 H01L 41/08

Claims (4)

(57) [Claims] An actuator mechanism for slightly bending and deforming the plate-like flexible structure in a direction from one side edge to another side edge of the plate-like flexible structure is attached to a part of the plate-like flexible structure. The vibration suppressing device for a plate-shaped flexible structure, comprising: a detector for detecting vibration of the plate-shaped flexible structure; and control means for controlling the actuator mechanism in accordance with a detection output of the detector. Characteristic vibration suppression device for plate-shaped flexible structures. 2. An actuator mechanism for slightly bending and deforming the plate-like flexible structure in a direction from one side edge to the other side edge of the plate-like flexible structure is attached to a part of the plate-like flexible structure. A bimorph-type or unimorph-type piezoelectric element vibration suppression device in which the actuator mechanism extends in the direction in the plate-like flexible structure in the plate-like flexible structure, wherein the vibration of the plate-like flexible structure is detected. A vibration suppressing device for a plate-like flexible structure, comprising: a detector; and control means for controlling the actuator mechanism according to a detection output of the detector. 3. An actuator mechanism for slightly bending and deforming the plate-like flexible structure in a direction from one side edge to the other side edge of the plate-like flexible structure is attached to a part of the plate-like flexible structure. A vibration suppressing device for a plate-shaped flexible structure, wherein the plate-shaped flexible structure is a solar cell paddle or a deployable antenna that is deployed in outer space. 4. The flexible plate-like structure according to claim 1, wherein the flexible plate-like structure is a solar cell paddle or a deployable antenna deployed in outer space. Vibration suppression device.