JP2000208956A - Housing with function for suppressing vortex vibration by wind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contract a range of a vortex frequency generated in a range of a wind velocity to be predicted and to suppress an influence of a vortex vibration by a wind by lengthening a representative length of a housing in association with an increase in the velocity. SOLUTION: A housing 2 is mounted at a strut 1, a container 6 is mounted at the housing 2, and blades 3, wind receiving plates 5 and ventilating intervals 4 are mounted at the container 6. These blades 3, the intervals 4 and the plates 5 of one set with two combinations are disposed vertically symmetrically, coupled by springs 7 in the container 6 by using spring connecting holes 8, and the blades 3 are clamped at the plates 5 with screws 9, a wind velocity is accelerated to generate lifts at the blades 4. The blades 3 are raised and a representative length of the housing 2 to be observed is simultaneously increased by raising of the plates 5 coupled to the blades 3. Thus, an influence of a vortex vibration by a wind can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing with a function of suppressing vortex vibration due to wind, and more particularly to a case with a function of suppressing vortex vibration caused by wind which suppresses a change in vortex frequency due to an increase in wind speed.

[0002]

2. Description of the Related Art Conventionally, an object which can be affected by wind, such as a radio transmission repeater attached to a telephone pole or a tower, a housing for collecting weather information, and the like, is considered from the viewpoint of safety and the like. Techniques have been proposed to reduce the effects of wind.

[0003] For example, a "jet fan and a thrust enhancing device" disclosed in Japanese Patent Application Laid-Open No. 8-121,836 discloses
This technology is applied to a fan for ventilation of a road tunnel or the like, and is a technology for suppressing a loss of thrust due to an increase in the rotation speed of the fan.

[0004] For this purpose, this prior art disposes a thrust amplifying member having an airfoil cross section near the outlet of a fan and fixes it, so that the vertical component of the lift generated in the thrust amplifying member, ie, the jet, is obtained. The reaction of the component toward the fan body gives thrust to the flow, rectifies the flow, and reduces thrust loss in the mixing zone.

[0005] Further, the "wind sway control method and wind sway control device for high-rise building" disclosed in Japanese Patent Application Laid-Open No. 9-256679 is a technique applied to a high-rise building, and is generated by strong wind of the building. This is a technique that aims to control shaking.

[0006] For this purpose, this prior art has a shaking observing means for observing shaking, and a plurality of vortex-excited vibration suppression wings which are installed so as to be able to protrude and retract based on the observation result of the observing means. By making a plurality of vortex-induced vibration suppression wings appear and disappear, the swing is controlled without affecting the shape of the building.

As described above, conventionally, various techniques have been proposed as techniques for reducing the influence of wind. However, the above-described techniques have problems in the complexity of the mechanism and the like. It is hard to say that it is generally used.

[0008] Therefore, the most common and widely used technique for suppressing the influence of wind at present is a technique for simply increasing the rigidity of a mounting portion of the apparatus. According to such a technique, a high effect can be obtained for reducing the influence of wind without requiring a complicated mechanism or the like.

[0009]

However, in the conventional countermeasures against wind vibration when the rigidity of the mounting portion of the apparatus is increased as described above, it is necessary to increase the rigidity and set a larger safety factor. Therefore, there is a problem that the cost is increased.

That is, since a member having an effective rigidity is very expensive and the structure of the device becomes complicated, the larger the safety factor is set, the higher the cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a housing with a function of suppressing vortex vibration due to wind, which can suppress vortex vibration due to wind with low cost and high effect. The purpose is to:

[0012]

According to the first aspect of the present invention,
It is characterized in that the vortex vibration due to wind is suppressed by increasing the representative length of the housing as the wind speed increases.

According to the present invention, the representative length of the housing is increased by increasing the wind speed, so that when the wind speed increases, the influence of vortex vibration due to wind can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a wing receiving lift by wind and a wind receiving plate connected to the wing, and the wing moves by a change in lift. It is characterized in that the wind receiving plate moves to change the representative length of the housing.

According to the present invention, when the speed of the wind increases or decreases, the wing receiving lift from the wind moves up and down, and accordingly, the wind receiving plate connected to the wing moves up and down. With the change of the length, the representative length of the housing can be changed.

According to a third aspect of the present invention, in the first aspect of the present invention, the housing has a housing attached to at least one or more predetermined surfaces of the housing, and a first housing housed in the housing.
A first wing connected to the first air receiving plate, the first wing moving in the vertical direction by receiving a lift along with a change in wind, and a first wing connected to the first air receiving plate by a spring. 2 and a second wing, which is connected to the second air receiving plate on the opposite side to the first air receiving plate side and moves vertically by receiving a lift along with a change in wind. It is characterized by having.

According to the present invention, when there is no wind, the first wind receiving plate and the second wind receiving plate stored in the storage section are:
When a wind is generated, the first wing and the second wing connected to each wind receiving plate and receiving a lift in accordance with the magnitude of the wind speed move to change the representative length of the housing. Therefore, vortex vibration due to wind can be suppressed.

According to a fourth aspect of the present invention, in the third aspect of the invention, the predetermined surfaces are four front, rear, left and right surfaces of the housing.

According to the present invention, it is possible to suppress eddy vibrations caused by winds from four directions.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a housing having a function of suppressing eddy vibrations caused by wind according to the present invention.

First, the state of generation of vortex vibration due to wind in the installed housing will be described with reference to FIG. FIG. 1 shows a conceptual diagram of generation of vortex vibration by wind with respect to an installed housing, which can be applied to the embodiment of the housing with a function of suppressing vortex vibration by wind according to the present invention.

As shown in FIG. 1, a flow F at a speed V
Is perpendicular to the housing 2. In this case, the vortex r1, the vortex r2, the vortex r3, the vortex r4, and the like generated in the wake of the housing 2 become a periodic pressure change, causing the housing 2 to vibrate. Here, reference numeral 1 shown in FIG. 1 is a column for attaching a housing.

In FIG. 1, four vortices are shown as vortices. However, the vortices generated in the casing applied to the casing having the function of suppressing vortex vibration due to wind according to the present invention are: Naturally, the number is not limited to four, but may be any number that varies temporally and spatially.

In this case, the representative length of the housing 2 is L [m],
Assuming that the wind speed is V [m / s] and the constant is C1, the vortex frequency is f
[Hz] is approximately predicted by the following equation (1). However, the effect in the thickness direction is ignored for simplicity.

F = C1 * V / L (1) Thus, the vortex frequency f [Hz] is equal to the typical length L of the housing 2.
It is inversely proportional to [m] and proportional to the wind speed V [m / s]. Note that, here, the representative length is defined by the length in the height direction of the housing 2, but even if it is defined as such, the expression (1) holds.
Therefore, in order to reduce the vortex frequency f [Hz], the representative length L [m] of the housing 1 may be increased or the wind speed V [m / s] may be reduced. However, the wind speed V
Is mainly determined under conditions such as the natural world, and it is difficult to operate it. Therefore, in the present invention, the main focus is on operating the representative length L [m] of the housing 2.

However, the expression (1) for obtaining the vortex frequency f is an example of an approximate expression, and in the case of the present invention having the function of suppressing vortex vibration due to wind, the vortex frequency is an expression for obtaining f. Is not limited to such an expression. In addition, for example, in the expression representing the vortex frequency f, at least one term in the expression becomes smaller as the representative length L of the housing becomes larger. The present invention can be applied to the case where the term is any.

Next, a first embodiment of a housing with a function of suppressing eddy vibration due to wind according to the present invention will be described with reference to FIG. FIG. 2 is a configuration diagram of a first embodiment of a housing with a function of suppressing vortex vibration due to wind according to the present invention. FIG. 2A shows a case with a function of suppressing vortex vibration due to wind according to the present invention. FIG. 2B is a perspective view of the first embodiment of the housing, and FIG. 2B shows a first embodiment of the housing with a function of suppressing eddy vibration caused by wind according to the present invention.
1 shows an exploded perspective view of the embodiment.

As shown in FIG. 2, the first embodiment of the housing with the function of suppressing eddy vibration due to wind according to the present invention comprises a housing 2, a support column 1 on which the housing 2 is mounted, and a housing 2. And the storage section 6 attached to the main body is constituted as a main member.

As shown in FIG. 2, the wing 3, the air receiving plate 5, and the ventilation space 4 are mounted in the storage section 6. The blade 3, the ventilation space 4, and the air receiving plate 5 are vertically symmetrically located in a pair of two sets, and are connected to each other in the storage unit 6 by a spring 7 using a spring connection hole 8. The wing 3 is fixed to the wind receiving plate 5 with screws 9.

Next, referring to FIG. 3, the first embodiment of the housing with the function of suppressing eddy vibration caused by wind according to the present invention shown in FIG. An example of the operation when a small wind is received will be described.

FIG. 3A shows an operation example in the case of receiving a wind with a low wind speed, and FIG. 3B shows an operation example in the case of receiving a wind with a high wind speed.

In the case shown in FIG. 3A,
The wind speed is low, and the wind receiving plate 5 is stored in the storage unit 6.
This is because when the wind speed is low, the lift on the wing 3 is small.

Then, as shown in FIG.
When the wind speed increases, the ventilation space 4 between the wing 3 and the housing 2 is increased.
Then, a lift FL is generated in the wing 3. This lift FL
As a result, the wing 3 rises. However, the lower wing of the housing 2
The wing 3 moves downward, which is the opposite direction to the moving direction.

At the same time as the lift FL is generated in the wing 3 and the wing 3 rises, the wind receiving portion 5 connected to the wing 3 rises and the casing 2
Increases the apparent representative length from L1 to L2.

That is, in equation (1), since L increases with V, the change in V / L is small, the increase in the frequency due to the wind is small, and the frequency applied to the housing due to the change in wind speed is suppressed. It is possible to do.

Next, the operation of the first embodiment of the housing with the function of suppressing eddy vibration due to wind according to the present invention will be described in more detail with reference to FIG. The wind speed shown in FIG. 3A is V1 and the wind speed shown in FIG. 3B is V2 (V1
<V2).

When the wind at the speed V1 hits the housing 2, V1
Is sufficiently small, the wind receiving plate 5 is housed inside the housing 6. The representative length of the housing 2 at this time is L1. When the speed changes from V1 to V2, the wind passing through the wing 3 generates a lift FL on the wing 3 and the wing 3 rises in the vertical direction. As a result, as shown in FIG. 3B, the apparent representative length of the housing 2 becomes L2.

On the other hand, unlike the first embodiment of the housing with the function of suppressing eddy vibration caused by wind according to the present invention, the case where the apparent representative length L of the housing does not change due to the magnitude of the wind speed, ie, L Is constant, f'12 is the change amount of the vortex frequency due to the change in the wind speed, and f12 is the change amount of the vortex frequency due to the change in the wind speed when the representative length L is changed as in the present invention. Then, the amount of change in the vortex frequency is as shown in the following (Equation 2).

F12 = V2 / L2-V1 / L1 <f′12 = V2 / L1-V1 / L1 (Equation 2)

Therefore, in the first embodiment of the housing with the function of suppressing vortex vibration due to wind according to the present invention, it can be seen that the amount of change is suppressed so that the vortex frequency is reduced.

Next, a second embodiment of a housing with a function of suppressing eddy vibration due to wind according to the present invention will be described with reference to the drawings. FIG. 4 is a perspective view of a second embodiment of a housing with a function of suppressing eddy vibration due to wind according to the present invention. However, in FIG. 4, the same members as those shown in FIG. 2 are denoted by the same reference numerals.

As shown in FIG. 4, the second embodiment of the housing with the function of suppressing eddy vibration caused by wind according to the present invention is a blade 3 having a wind vibration suppressing function, and a wind receiving plate (not shown). Are installed on four front, rear, left and right surfaces of the housing 2.

Here, the operation of the blades 3 on each surface and the air receiving plate connected to the blades 3 will be described with reference to the first case of the above-described housing with vortex vibration suppression function according to the present invention. Since the operation is the same as that of the embodiment, the description is omitted.

Therefore, in the second embodiment of the housing with the function of suppressing vortex vibration due to wind according to the present invention, it is possible to suppress the change of wind vibration with respect to wind from four directions. It is possible.

As is clear from the above description of the embodiment, according to the present invention, like a wireless transmission repeater attached to a utility pole or a steel tower, or a wireless transmission repeater installed on the roof of a building or the like, It is suitable to be applied to a housing that can be affected by vortex vibration due to wind.

Further, the present invention can be applied not only to a radio transmission repeater but also to a housing exposed to wind, for example, a housing for collecting weather information.

[0047]

As is apparent from the above description, according to the present invention, as the wind speed increases, the apparent length of the housing, that is, the representative length, can be increased.
By suppressing the variation of the wind vibration, the range of the vortex frequency generated within the range of the predicted wind speed is reduced. As a result, it is possible to provide a housing with a function of suppressing vortex vibration due to wind, which can easily perform a design such that the natural frequency of the system including the housing and the support is out of the range of the vortex frequency. Can be.

Further, since the wind receiving plate rises due to the wind to suppress the wind vibration, the energy for suppressing the wind vibration is obtained from the wind itself, so that no power is required and the structure is simplified. In addition, it is possible to provide a housing with a function of suppressing eddy vibration due to wind, which can reduce costs.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of vortex generation in a first embodiment of a housing with a function of suppressing vortex vibration due to wind according to the present invention.

FIG. 2 is a configuration diagram of a first embodiment of a housing with a function of suppressing eddy vibration due to wind according to the present invention.

FIG. 3 is a schematic diagram of an operation of the first embodiment of the housing with a function of suppressing eddy vibration due to wind according to the present invention.

FIG. 4 is a schematic diagram of a configuration of a second embodiment of a housing with a function of suppressing eddy vibration due to wind according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 support 2 housing 3 wing 4 ventilation space 5 air receiving plate 6 storage section 7 spring 8 spring connection hole 9 screw

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[Procedure amendment]

[Submission date] February 4, 2000 (200.2.4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

[0012]

The housing according to the present invention has a wind
Equipped with a wind vibration suppression member that suppresses the amount of change in the vortex frequency
It is characterized by. The wind vibration suppression member is characterized by suppressing the amount of change in the vortex frequency due to the wind by increasing the length of the housing in the height direction as the wind speed increases.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

The wind vibration suppressing member has a wing receiving lift by wind and a wind receiving plate connected to the wing. The wind receiving plate moves as the wing moves due to a change in lift, and the wind receiving plate moves to form a housing. height
The length of the direction is changed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

Further, the housing includes at least one or more of the storage portion which is attached to the predetermined surface of the housing, the first wind-receiving plate which is held in the holding section, is connected to the first wind receiving plate A first wing that moves in the vertical direction by receiving lift along with a change in wind;
A second air receiving plate connected to the first air receiving plate by a spring,
A second blade is connected to the second wind receiving plate on the side opposite to the first wind receiving plate side, and has a second wing that moves in a vertical direction by receiving a lift according to a change in wind.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

The predetermined surface to which the storage portion is attached may be four front, rear, left and right surfaces of the housing.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

[0047]

As is apparent from the above description, according to the present invention, as the wind speed increases, the height direction of the housing increases.
Since the length of the wind speed can be increased, the range of the vortex frequency generated within the range of the predicted wind speed is reduced by suppressing the amount of change in the wind vibration. As a result, it is possible to provide a housing with a function of suppressing vortex vibration due to wind, which can easily perform a design such that the natural frequency of the system including the housing and the support is out of the range of the vortex frequency. Can be.

Claims (4)

[Claims] 1. A housing with a function of suppressing vortex vibration caused by wind by suppressing a vortex vibration caused by wind by increasing a representative length of the housing as the wind speed increases. 2. A wing that receives lift by wind, and a wind receiving plate connected to the wing, wherein the wing moves due to a change in lift, so that the wind receiving plate moves to move the casing. 2. The method of claim 1, wherein the representative length is changed.
A housing with a function to suppress eddy vibrations due to the wind described. 3. A housing, wherein a housing is attached to at least one or more predetermined surfaces of the housing, a first air receiving plate housed in the housing, and a first air receiving plate. A first wing, which is connected to the first wing and moves in a vertical direction by receiving a lift according to a change in wind; a second blast plate connected to the first blast plate by a spring; The wind vortex according to claim 1, further comprising a second wing connected to a side opposite to the first wind receiving plate side of the wind plate, the second wing moving in a vertical direction by receiving a lift along with a change in the wind. Housing with vibration suppression function. 4. The housing with a function of suppressing vortex vibration caused by wind according to claim 3, wherein the predetermined surfaces are four front, rear, left and right surfaces of the housing.