JPH0754133B2 - Lead elasto-plastic vibration absorber - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a so-called lead elasto-plastic vibration absorbing device (damping device, which absorbs vibration energy by utilizing elasto-plastic deformation of lead).
Also called a damper. More specifically, the present invention relates to a lead elasto-plastic vibration absorber that belongs to a type that restricts the outer diameter of an energy absorber made of lead.

[Prior Art] An elastic-plastic vibration absorber using lead is disclosed in, for example, Japanese Patent Laid-Open No. 59-
It is known from Japanese Patent Publication No. 62742 (hereinafter referred to as "prior art").

FIG. 4 shows the structure of the main part and the state at the time of deformation. A is a cylindrical energy absorber made of lead, and B is a restraint wound in a spiral shape on the outer circumference of the energy absorber. The members and c are elastic supporting members arranged on the outer periphery of the members. The restraining member (b) restrains the outer diameter of the energy absorber (a) by spirally winding a strip-shaped member made of spring steel or the like. The elastic support member c has a structure in which pads made of an elastic material made of rubber and reinforcing plates made of a reinforcing material made of steel, aluminum, or the like are alternately laminated, and has a load supporting function.

With this configuration, when the energy absorber (i) is deformed due to vibration, the restraint member (b) acts to prevent a harmful phenomenon (occurrence of a constriction or a bulge) due to plastic deformation of the energy absorber (i). is there.

However, the study by the present inventors has revealed that the behavior of the conventional technique during vibration is scrutinized to have the following problems.

According to the conventional technique, the configuration of the restraint member is considered under the assumption that a pure shearing force is applied to the energy absorber and the energy absorber is deformed, but in reality, the behavior of vibration (or As a characteristic of the structural system), a bending shearing force to which a bending force is applied acts on the energy absorber. In other words, the tensile force acts on one side surface of the cylindrical energy absorber and the compressive force acts on the other side surface thereof, and these acts alternately.

As a result, in the prior art, since the restraint member is simply spirally wound and no special consideration is given, when the restraint member is also considered as a cylindrical body, it is adjacent to the side face that receives the tensile force. A gap is created between the matching restraining members, and the lead material that plasticizes and absorbs the vibration energy easily protrudes from this gap. Further, on the side face receiving the compressive force, collision and meshing will occur between the restraining members.

In reality, since the tensile force and the compressive force are alternately applied, the protruding lead substance is caught between the restraint members, making the restraint members non-uniform and receiving a compressive force. In some cases, stress concentration may occur and the restraint member may be damaged.

However, it is hard to say that the restraint member in the prior art effectively exerts its intended action, that is, the action of preventing the occurrence of a local constricted portion or a bulging portion due to plastic deformation of the energy absorber. It's a reality.

[Technical Problem of the Present Invention] In view of the above circumstances, an object (technical problem) of the present invention is to improve the characteristics of the restraint member in the elasto-plastic vibration absorber.

Therefore, the present invention aims to achieve the above object by paying attention to the cooperative action of the corrugated tube and the hoop.

That is, according to the present invention, it is possible to restrain the bending-shear deformation by utilizing the cooperative action of the corrugated pipe and the hoop, on the assumption that the actual device of this kind is subjected to bending shear more or less. It is intended to approach the ultimate pure shear deformation.

[Configuration and Action of the Present Invention] The lead elasto-plastic vibration absorber of the present invention has the following configuration (technical means) in order to achieve the above object. That is, a metal corrugated tube, a metal tag fitted into the outer periphery of the valley portion of the corrugated tube, and an energy absorber made of lead sealed by casting in the outer diameter restraining member, Characterize.

Here, the outer diameter restraint member is constituted by the corrugated pipe and the hoop.

In this configuration, the horizontal flexibility in which the same cross-sectional area is maintained in the horizontal direction due to the cooperative action of the corrugated tube and the hoop is superior to the elasticity.

With this configuration, the outer diameter restraining member of the present device has the following functions.

When a structure or the like receives strong and sudden vibration and is transmitted to this device, this device undergoes plastic deformation due to forced vibration. Thus, the lead columnar body in this apparatus quickly absorbs the vibration energy due to its shear plastic deformation. At this time, the outer diameter restraint member of this device has a characteristic that the same cross-sectional area is maintained in the horizontal direction and the (horizontal) flexibility is superior to the axial expansion and contraction, so the cylindrical lead body is close to pure shear. Deformation (some bending remains) will be repeated.

When the deformation of the cylinder becomes large, a strong restraining force of the outer diameter restraining member acts to prevent further deformation of the cylinder.

[Effects of the Present Invention] Since the lead elastic-plastic vibration absorber of the present invention has the above-mentioned configuration, it has the following unique effects.

Since the lead body is subjected to pure shear deformation as much as possible by the outer diameter restraint member of the present device, it is possible to improve the vibration energy absorption efficiency.

Since the energy absorber is integrally wrapped by the corrugated tube, there is no functional disorder due to the protrusion or the biting of the energy absorber.

Even for the remaining bending shear deformation, the outer diameter restraint member of the present device can absorb it due to a slight stretchability, so that no undue stress is generated in the outer diameter restraint member.

The restraint member exerts a strong resistance against the action of excessive deformation force on the device, and can prevent excessive deformation of the energy absorber.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the lead elastic-plastic vibration absorbing device (damper) D of the present invention.

The device D comprises the energy absorber 1 and the main part of the outer diameter restraining member 2. The device D is installed between the upper structure G and the lower structure B via the upper and lower flanges 5 and 6.

The energy absorber 1 is made of lead and does not prevent the use of a lead alloy or a mixture with lead and other substances.
Further, the shape thereof is formed into a substantially columnar shape.

The outer diameter restraining member 2 includes a corrugated tube 3 and a hoop 4.

The corrugated tube 3 is a metal bellows tube and encloses and holds the energy absorber 1. The corrugated tube 3 is flexible by itself.

The hoop 4 has an annular shape with a circular cross section, and is fitted in close contact with the respective troughs of the corrugated pipe 3.

By fitting the hoop 4 to prevent buckling at the valley portion (cross-sectional contraction portion) of the device D, it goes without saying that the device 4 cooperates with the function of the corrugated tube 3 to prevent the energy absorber 1 from buckling. It has an important function of restraining bending deformation and causing pure shear deformation.

To enclose the energy absorber 1 in the corrugated tube 3, the outer diameter restraint member 2 is assembled, and molten lead (melting point 3 27.5 ° C.) is cast into the outer diameter restraint member while holding the outer periphery. To form.

The upper and lower flanges 5, 6 are formed with recesses 5a, 6a,
The upper and lower ends of the device D are fitted and fixed in the recesses 5a and 6a.

FIG. 3 shows another embodiment of the device D. In this embodiment, annular corrugations 7 having a convex cross section are fitted in the respective valleys of the corrugated pipe 3.

The apparatus of the present embodiment configured as described above functions as follows.

When a structure undergoes a minute vibration due to a wind, a braking load of an automobile, a small earthquake, or the like, the cylindrical lead body 1 absorbs the minute vibration due to its elastic deformation.

When strong and abrupt seismic vibration occurs, the vibration propagates to the structure, and abrupt relative displacement occurs between the upper and lower structures G and B. Since the device D is interposed between the upper and lower structures G and B via the flanges 5 and 6, the vibration causes the device D to forcibly vibrate. Therefore, the lead columnar member 1 of the present device D undergoes plastic deformation, and the vibration energy is absorbed by the energy consumption accompanying the plastic deformation.

That is, the plastic deformation of the lead body is relatively low shear stress (10
It starts at 5 kg / cm ² ) and behaves as if it were a viscoelastic body due to the interaction between recovery and texture crystallization due to hot work change. Then, energy is absorbed when the tissue generated by this deformation is restored to its original state.

The outer diameter restraint member 2 of the device makes this absorption of energy more efficient. That is, since the outer diameter restraining member 2 has a characteristic that the cross-sectional area is kept constant and the flexibility in the horizontal direction is superior to the elasticity in the axial direction, the energy absorber 1 is deformed together with the outer diameter restraining member 2. The deformation will be close to the pure shear deformation.

Further, since the outer diameter restraining member 2 allows a little stretchability (tensile / compression on the side surface) in the axial direction, it is possible to absorb the influence of the remaining bending shear deformation. The outer diameter restraint member 2 itself is not damaged.

Furthermore, when an excessive shearing force acts on the energy absorber 1, the outer diameter restraining member 2 exerts a strong restraining force to prevent the energy absorber 1 from being excessively deformed.

The present invention is not limited to the above embodiments, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included in the technical scope of the present invention.

The device D is attached to the flanges 5 and 6 by the concave-convex fitting in the above embodiment, but the flange and the outer diameter restraint cylinder are fixed by welding, or the lead cylinder is attached to the flange. It is possible to adopt a mode of directly fixing by brazing.

An elastic support member is arranged around the device D, and the load of the structure is supported by the elastic support member (fourth embodiment).
See the conventional example in the figure).

[Brief description of drawings]

FIG. 1 is a partial sectional side view of an embodiment of the lead elasto-plastic vibration absorber of the present invention, FIG. 2 is an enlarged sectional side view of an essential part, and FIG. 3 is a partial sectional side view of another embodiment. FIG. 4 is a partial sectional view showing the structure of a conventional elasto-plastic vibration absorber. 1 ... Energy absorber, 2 ... Outer diameter restraint member, 3 ...
Corrugated pipe, 4,7 ... Haga, D ... Lead elasto-plastic vibration absorber

Front Page Continuation (72) Inventor Shigeru Fujimoto 1 Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa Inside the Toshiba Research Institute, Inc. (72) Inventor Noboru Narukawa Komukai Toshiba-cho, Kawasaki-shi, Kanagawa 1-share Inside the Toshiba Research and Development Laboratories (72) Inventor Chiaki Tsuruya 413-4, Amama, Akigawa, Tokyo

Claims (1)

[Claims] 1. A metal corrugated pipe (3), a metal tag (4) fitted to the outer circumference of a valley portion of the corrugated pipe, and lead enclosed in the corrugated pipe (3) by casting. A lead-elastic-plastic vibration absorber, comprising: an energy absorber (1).