JPH04136537A - Vibration control device for structure - Google Patents

Abstract

PURPOSE:To simply and exactly set natural frequency by protruding plural plate springs in parallel with spacing on the right and left from a supporting part on a structure, joining the plate springs with a viscoelastic body or a viscous body into a laminar structure, further mounting weights to free end sides of the laminar structure, and arranging the weights symmetrically with respect to the supporting part. CONSTITUTION:With a vibration control device 1, plate springs 3, weights 7, a viscoelastic body 8 are arranged symmetrically with respect to a supporting part consisting of a supporting base 4, etc., so that resonant vibration is well balanced about the supporting part, and bending moment is not applied to the supporting part. As a result, there is no need to take into account the spring constant of the supporting part in order to determine the spring constant (k). Thus, simply by performing a simple calculating treatment of calculating the spring constant of the plate springs 3, the natural frequency of the vibration control device 1 can be set exactly. Even when the spring constant of the supporting part is changed due to deterioration with age of supporting part, a bad state in which the natural frequency is changed, will not occur.

Description

[Detailed Description of the Invention] C. Industrial Application Field] The present invention relates to an improvement of a vibration suppression device that suppresses the vibration of structures such as general industrial machinery and buildings, and more specifically, the present invention relates to an improvement of a vibration suppression device that suppresses the vibration of structures such as general industrial machinery and buildings. The present invention relates to a vibration suppression device for structures that can be easily set.

[Prior art]

FIGS. 4(a) and 4(b) are a front view and a front view showing a conventional structure vibration suppressing device disclosed in Japanese Patent Application Laid-Open No. 110938/1987, which is operable even when the vibration of the structure is minute; FIG.

In this vibration suppressing device 51, I! to the fixture 54 attached to the structure 52 whose movement is to be suppressed.

A plurality of leaf springs 5 are arranged in parallel with each other at intervals on a plurality of surfaces perpendicular to the vibration direction indicated by the arrow X of the same structure 52.
3 is installed.

Furthermore, in this vibration control device 51, the parallel leaf spring 5
3 are joined with a viscoelastic body or viscous body 57 (hereinafter simply referred to as a viscoelastic body) interposed therebetween.

Yet again. In this vibration suppressing device 51, a weight 56 is attached to the free end side of the joined plate spring 53.

In the vibration suppressing device 51, the natural frequency f of the vibration suppressing device 51 is set by the following equation so that the weight 56, the plate spring 53, etc. resonate with the vibration of the structure 52.

However, k: leaf spring 53. Fixing fittings 54 and structures 52
Spring constant m of the fixing fitting attachment part, etc.: Mass of the weight 56, that is, in this vibration suppressing device 51, the plate spring 53 etc. resonate at the natural frequency f due to the vibration of the structure 52, and the same resonance vibration occurs. Due to the shearing deformation of the viscoelastic body 57 accompanying the deformation of the leaf spring 53, the vibration energy of the structure 52 is converted into thermal energy and released into the atmosphere, thereby suppressing the vibration of the structure 52.

By the way, as shown in the proviso to the above equation (1), the spring constant of the vibration suppressing device 51 is not determined only by the spring constant of the plate spring 53, but also includes the spring constant of the fixing fitting 54, etc.

This means that in this vibration suppressing device 51, the bending moment centered around the fixing point of the fixture 54 to the structure 52 due to the resonance vibration direction Y of the plate spring 53 shown in FIG.
This is because it is applied not only to the plate spring 53 but also to the fixing fitting 54 and the joint portion between the fixing fitting 54 and the plate spring 53.

That is, in this vibration suppressing device 51, the natural frequency f changes depending on the spring constants of the fixing fitting 54, the joint portion, etc.

Nevertheless, in this conventional vibration suppressing device 51, it is usually difficult to calculate the spring constants of the fixing fittings 54 and the joints, etc. Since it takes a lot of time to calculate the spring constants of the fixing fittings 54, etc., the natural frequency f may not be set accurately.

[Problem to be solved by the invention]

Therefore, in the conventional vibration suppressing device 51 described above.

In some cases, the structure did not resonate well with the vibration of the structure 52, and its vibration suppression effect was poor.

Furthermore, as described above, the natural frequency f of the vibration suppressing device 51 changes depending on the spring constant of the joint between the fixing fitting 54 and the plate spring 53, etc.

For example, due to aging, some of the joints may peel off, and the queen spring constant etc. may change.

There was also a problem that the natural frequency f also changed.

Therefore, the present invention has been made with the object of providing a vibration suppressing device for a structure that allows the natural frequency to be set easily and accurately, and that can always suppress the vibration of the structure well. It is something that

[Means to solve the problem]

In order to achieve the above object, the present invention provides a plurality of parallel leaf springs protruding from a support provided on a structure at intervals in both left and right directions, and the parallel leaf springs have viscoelastic properties. A weight is attached to each free end side of the leaf spring joined in layers by a body or a viscous body, and the leaf spring, the viscoelastic body or the viscous body, and the weight are moved left and right around the support part. It is configured as a vibration suppression device for a structure characterized by symmetrical arrangement.

[Effect]

In the vibration suppressing device for a structure according to the present invention, the vibration suppressing device 51 is fixed to the supporting portion symmetrically with respect to the supporting portion.

As a result, in the vibration suppression device according to the present invention.

Due to the vibration of the structure, the plate spring etc. resonate in a well-balanced manner around the support portion.

Therefore, unlike the conventional system, no bending moment is applied to the support section, so the natural frequency of the vibration suppressing device can be set without considering the spring constant of the support section.

Therefore, in the vibration suppressing device according to the present invention, in order to set the natural frequency, it is only necessary to find the spring constant of the leaf spring, and the natural frequency can be set more accurately and easily than before. .

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

Note that the following example is an example embodying the present invention, and 1
It is not intended to limit the technical scope of the present invention.

FIG. 1 is a schematic vertical cross-sectional view showing an example of a vibration suppressing device for a structure according to an embodiment of the present invention, FIG. 2 is a schematic vertical cross-sectional view showing another example of the same vibration suppressing device, and FIG. It is a vertical cross-sectional schematic diagram which shows still another example of the same vibration suppression device.

In this vibration suppressing device 1, as shown in FIG. A plurality of leaf springs 3 are arranged in parallel with each other at intervals on a plurality of planes perpendicular to the plane.

Bolt 5. It is attached via.

The above-mentioned support stand 4 and pole) 5,5. etc. are examples of supporting parts.

Furthermore, in this vibration suppressing device 1, the parallel plate springs 3 are joined in a layered manner by a viscoelastic body or a viscous body 8 (hereinafter simply referred to as a viscoelastic body), and the joined plate springs A weight 7 is attached to the free end side of 3.

However, in this vibration suppressing device 1, as shown in FIG. This differs from the conventional one in that the weight 7 and the viscoelastic body 8 are arranged symmetrically with respect to the support part made of the support base 4 and the like.

That is, the vibration suppressing device 1 in this embodiment has a conventional vibration suppressing device 51 attached to the supporting base 4 symmetrically with respect to the supporting base 4.

The leaf springs 3, which are arranged symmetrically with respect to the support base 4, may be integrated as shown in FIG. 1, or may be separate bodies.

Therefore, in this vibration suppressing device 1, due to the vibration of the structure 2, the plate spring 3 and the like resonate in a well-balanced manner around the support portion at the natural frequency f determined by the equation (1).

Therefore, since the resonance vibration is balanced around the support part, the bending moment described above is not applied to the support part, unlike the conventional system.

As a result, to find the spring constant k in equation (1) above.

There is no need to consider the spring constant of the support section.

Therefore, the natural frequency f of the vibration suppressing device 1 can be accurately set by a simple calculation process that only calculates the spring constant of the leaf spring 3.

In addition, in this vibration suppressing device l in which the plate spring 3 and the like vibrate resonantly in a well-balanced manner centering on the support part as described above, the spring constant of the support part changes due to aging etc. of the support part, causing the above-mentioned natural vibration. There is no problem that the number f changes.

In the above embodiment, as shown in FIG.
However, in consideration of changes in loss coefficient (viscosity) due to temperature changes of the viscoelastic body 8, the number of viscoelastic bodies 8 is increased to a plurality of sheets. (For example, as shown in FIG. 2, three leaf springs 3 and two viscoelastic bodies 8) are used as a vibration suppressing device 1 that effectively operates over a wide temperature range.
．． may be configured.

Further, in the above embodiment, the support part is the support base 4 and the support part 5.
,5. However, as shown in Fig. 3, the support part is connected to bolts 5. The leaf spring 3 is connected to the bolt 5. Vibration suppressor 1 by bending symmetrically around the center. may be configured.

In this way, the number of parts constituting this vibration suppressing device can be reduced.

〔Effect of the invention〕

From the supports provided on the structure according to the invention.

A plurality of leaf springs are provided in parallel with each other at intervals in both left and right directions, the parallel leaf springs are joined in a layered manner by a viscoelastic body or a viscous body, and the free end of the leaf spring joined in the layered manner. There is provided a vibration suppressing device for a structure, characterized in that a weight is attached to each side, and the plate spring, the viscoelastic body or the viscous body, and the weight are arranged symmetrically with respect to the support part.

Therefore, in this vibration suppressing device, the natural frequency of the vibration suppressing device can be set accurately and easily, and the vibration of the structure can be suppressed well.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view showing an example of a vibration suppressing device for a structure according to an embodiment of the present invention, FIG. 2 is a schematic vertical cross-sectional view showing another example of the same vibration suppressing device, and FIG. FIGS. 4(a) and 4(b) are a schematic vertical cross-sectional view showing still another example of the vibration suppressing device, and FIGS. 4(a) and 4(b) are a front view and a side view, respectively, showing an example of the conventional vibration suppressing device for a structure. [Explanation of symbols] 1.1. , lb...Vibration suppression device

Claims (1)

[Claims] 1. A plurality of plate springs are provided in parallel with each other at intervals in both left and right directions protruding from a support portion provided on a structure, and the parallel plate springs are made of a viscoelastic material or a viscous material. A weight is attached to each free end side of the leaf spring joined in layers by the body, and the leaf spring, the viscoelastic body or the viscous body, and the weight are arranged symmetrically with respect to the support part. A vibration suppression device for structures characterized by: 2. The vibration suppressing device for a structure according to claim 1, wherein the leaf springs arranged symmetrically about the support portion are integral. 3. The vibration suppressing device for a structure according to claim 1, wherein leaf springs symmetrical about the support section are separately attached to the support section.