JPS61256038A - Dynamic vibration absorber - Google Patents

Abstract

PURPOSE:To enable a natural frequency to be variably changed in no relation to a level of mass, by mounting a dynamic vibration absorber building a damper to a tilt vibrator through a tilt angle adjusting device. CONSTITUTION:A mounting bed frame 1 is supported by a rotary support 2 variably changing a tilt angle alpha, while the frame 1 provides a tilt adjusting mechanism 3 to be arranged. One end of a rod 5 is supported to a shaft 4 protrusively provided in the mounting bed frame 1, while the other end of the rod 5 secures an object 7 serving as the mass. The rod 5, mounting a damper 8, absorbs vibrative energy.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Applications Vibration isolators for chimneys, bridges, etc. Conventional technology In FIG. 4, an object 01 is supported at the upper end of a rod 02. The lower end of the lot 102 is pivotally attached to the bin 03, and is held substantially vertically and swingably by a spring 04 and a damper 05.

The natural frequency f of this vibration system is, where: m: Mass of object 1 J: Moment of inertia (ignoring the mass of the rod, m1 m?Double force acceleration By installing the damper in accordance with the number y, vibration energy is absorbed by the damper and a cutting effect is obtained.

Problems to be Solved by the Invention The above-mentioned dynamic vibration absorber requires (a) adjusting the mass, spring size, or their mounting device to match the vibration frequency;
(b) Long-period structures (actual structures) that are difficult to fine-tune
There are problems such as (c) there is a risk of fatigue failure due to repeated charging due to vibration.

Means for solving the problem Applying the principle of a tilted pendulum, (1) Using only a damper without using a spring, (2) Installing a device to adjust the tilt angle, and changing the natural frequency to the size of the mass. It is variable regardless.

By adjusting the tilt angle of the working tilt pendulum, the natural frequency changes.

Embodiment In FIGS. 1 and 2, reference numeral 1 indicates a mounting frame supported by a rotary support 2 to change the angle of inclination α, 3 indicates an inclination adjustment mechanism for the mounting frame 1, and 4 projects from the mounting frame l. 5 is a rod supported on the shaft 4 by a bearing 6, 7 is an object fixed to the free end of the rod 5, and 8 is a damper for the rod 95.

If the natural frequency of this vibration system is f, then the main vibration absorber is mounted on the object to be vibration-isolated using one or more rotary supports 2, and the mounting frame 1 is mounted around the rotary supports 2 with respect to the horizontal axis using the tilt adjustment mechanism 3. Adjust the natural frequency so that it is tilted by α, and adjust the natural frequency to the frequency of the object to be vibration-proofed (y) (0.9
5±0.1) When the object to be vibration-proofed vibrates, the dynamic vibration reducer is activated, and the vibration energy is absorbed by the damper 8 attached to the rod 5 or the object 7, thereby suppressing the vibration.

FIG. 3 shows another embodiment in which there are two rods 95' and two bearings 6'.

Advantages of the invention A: No spring is required, so there is no fear of spring fatigue failure.
0. Vibration isolation can be achieved for long periods by simply adjusting the angle α, regardless of the mass.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the dynamic vibration damping device of the present invention, Fig. 2 is a view taken along the arrows ⋅-■ of the same as above, Fig. 3 is a side view of another embodiment, and Fig. 4 is a schematic diagram of a conventional device. It is. l...Mounting frame, 2...Rotation support, 3...Inclination adjustment mechanism, 5...Lot 9.6...Bearing, 7...Object, 8...Danno- Agent: Patent attorney: Shige Okamoto (2 persons)

Claims (1)

[Claims] A dynamic vibration absorber characterized in that a dynamic vibration absorber in which a damper is incorporated into a tilted pendulum is attached to an object to be vibration-isolated via a rotary support that transmits vibration damping force and an inclination adjustment mechanism.