JPS61256036A - Dynamic vibration absorber - Google Patents

Abstract

PURPOSE:To enable a device to be applied to a structure of long period, by constituting the device such that a damper, extended and contacted if a cylindrical mass rolls on a curved surface plate, absorbs vibrative energy. CONSTITUTION:A cylindrical mass 1 rolls on a curved surface plate 2. An axis 3 of the cylindrical mass 1 is supported by a rod 4. The rod 4 is suspended by a pin 6 in a supporting frame 5 through a damper 7. The supporting frame 5, being mounted to an objective structure, absorbs vibrative energy of the mass.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: Vibration isolation for horizontal vibrations of chimneys, towers, machinery, etc. Conventional technology In FIG. 5, mass 01, damper 02. Spring 03
By constructing a dynamic vibration absorber and installing it so that the natural frequency of the dynamic vibration absorber almost matches the natural frequency of the structure 04 to be vibration-isolated, the vibration energy is transferred to the damper 02.
absorbs vibrations and obtains a vibration-proofing effect.

Problems to be solved by the invention A: In the case of long-period structures, very weak springs are required, making it difficult to apply.

There is a possibility of aging deterioration or fatigue failure of the mouth and spring.

Means for Solving the Problems Attach one or more of this device to the object to be vibration-isolated, and adjust the curvature R of the curved plate so that the rolling natural frequency of the cylindrical mass almost matches the natural frequency of the object to be vibration-isolated. Set up cylindrical mass distribution.

When the vibration-isolated object vibrates, the cylindrical mass rolls and vibrates, and the vibration energy is absorbed by the damper installed between the cylindrical mass and the support frame, suppressing the vibration of the vibration-isolated object.

EXAMPLE In FIG. 1, a cylindrical mass 1 rolls on a curved plate 2. In FIG. A shaft 3 of cylindrical mass l is supported by a rod 4.

The rod 4 is suspended from a pin 6 of a support frame 5 via a damper 7.

In such a device, when the cylindrical mass 1 rolls on the curved plate 2, the damper 7 expands and contracts, and the damper 7 absorbs vibration energy.

2, 3 and 4 show other embodiments, P is a pin support, D is a damper, and R is a rail.

Effect of the Invention 41 Since the natural frequency of rolling can be arbitrarily set by changing the curvature R of the curved plate and changing the rotational inertia of the cylindrical mass, it is particularly applicable to long-period structures.

Since the production accuracy of the mouth single curved plate can be expected to be sufficient, the frequency setting accuracy is good.

C. The set rolling vibration frequency does not change over time and maintenance is not required.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing an embodiment of the dynamic vibration damping device of the present invention;
4 to 4 are schematic diagrams of other embodiments, and FIG. 5 is a principle diagram of a conventional device. 1... Cylindrical mass, 2... Curved plate, 3... Shaft, 4
...Lot 9.5...Support frame, 7...Dumper sub-agent Patent attorney Shigefumi Okamoto and two others Figure 2

Claims (1)

[Claims] Consisting of a support frame, a rod rotatably connected to the frame via a damper, and a mass rotatably connected to the rod and rolling on a curved surface or curved track formed on the frame, A dynamic vibration absorption device characterized in that the support frame is attached to a target structure to absorb vibration energy.