JPS6057029A - Vibration control equipment - Google Patents

Abstract

PURPOSE:To improve the performance stability and the maintainability by providing a damper, which consumes vibrational energy by changing it into electrical power with the use of an electric generator, between a vibrating body and a movable mass. CONSTITUTION:A movable mass 4 is connected to a vibrating body 1 via a spring 2, and the reciprocating motion of the movable mass 4 is transformed into the rotary motion by a ball screw 8 to rotate a rotor 5 of a generator 3' which is connected to the ball screw 8. The rotation of the rotor 5 induces an electromotive force in the winding of the generator 3', and an electric current flows through a winding resistance/load resistance 11, thus the energy is consumed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration control device that controls the vibration of a vibrating body such as a building by the movement of a movable mass.

Generally, a method called a dynamic damper has been used to prevent vibrations occurring in a vibrating body. This dynamic damper is shown in FIG.

A spring (
2) and a movable mass (4) of mass M2 are movably attached via a damper (31) represented by a dashpot.

In this dynamic damper, the vibration of the vibrating body (1) is
The damper (3) installed between the vibrating body (I+ and the movable mass (4)) converts the motion of the movable mass (4) into
By consuming the vibration energy of , the vibration of the vibrating body +17 is damped.

The equation of motion in this case is as follows.

Here, X is the displacement of the vibrating body (υ), 1 is the spring constant of the vibrating body il+, X2 is the displacement of the movable mass (4), C2 is the damping constant of the damper (31), and F is the external force.

As mentioned above, the conventional dynamic damper has a damper (3
), a reducing blade (ry = c2) acts between the vibrating body (1) and the movable mass (4), and the vibrating body (1)
1 vibration is damped.

With this dynamic damper VC, vibration control ω −
□・ω ・・・・River・・・・・・・ +21210μ
1 where μ: mass ratio (M2/M1) It is a well-known fact that the optimum value of the damping constant 02 of the damper (3) as well as ω2 can be determined by the following equation.

Therefore, ω2. If the value of C2 deviates from the value calculated by equations (2) and (3), the vibration reduction effect will deteriorate.

In conventional dynamic dampers, a hydraulic damper using oil pressure has been used as the damper (3).

However, the viscous resistance of conventionally used hydraulic dampers changes depending on the temperature. Poor maintainability.

The damping constant 02 had disadvantages such as poor linearity with respect to the magnitude of the damper stroke and difficulty in adjusting the damping constant 02.

The present invention provides a vibration control device that eliminates the above drawbacks by using a 9-generator as the damper t31.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a diagram showing the vibration control device of the present invention.
3°) is a generator fixed on the moving mass (4), the rotor (5) and the stakes (6) are fixed, the stator (6) is fixed on the moving mass (4), The rotor (5) is.

Coupling (7) and screw ball screw (81t/
) connected to one end. Pole screw (81 (
D - end kt bearing (9);
The winding 1) is connected to a load resistance αD.

The movable mass (4) is connected to the vibrating body +II by the spring (2), and the forward and backward movement of the movable mass (4) is converted into rotational motion by the pole screw (8), Rotor (5) of coupled generator (3°)
Rotate.

The rotation of the rotor (5) causes an electromotive force to be induced in the three windings of the generator (9), and current flows through the nine windings and the load resistance.

In the vibrating device of the present invention having the above-described configuration, when an external force is applied to the vibrating body (1) and vibration is caused, the movable mass (4
) is coupled with the vibrating body fi+, and the vibrating body (1
) and the moving mass (4).

This relative motion is converted into rotational motion by the pole screw (8), which rotates the generator (three rotors (5),
"Generator (generates electromotive force in three parts. Generator (3")
Due to the induced electromotive force, a current flows through the winding resistance 9 and the load resistance aυ, and the mechanical vibration energy is converted into electrical energy by the 9 generator (3') and consumed.

When three generators are used as the damper (3), the damping constant 02 is 9 mechanical vibration damping power, the winding resistance of the generator (3°), and the electrical power consumed by the load resistance (111). Based on the condition of equality, it is given by the following formula.

Here 11. Induced electromotive force constant of two generators (”/”/’, 3
)L; Pole screw lead length (m) Ra; Winding resistance (Ω) RL; Load resistance (Ω) In equation (4), tKF and IRaIL are the generator (3”) used, the pole screw (8 ), the attenuation constant 02 can be set to 8 by varying the load resistance aυRL. Also, the attenuation constant 02 can be set to 8 by changing the load resistance aυRL. Since it is inversely proportional to the square of the length, a wide range of reduction constants 02 can be obtained depending on the selection of lead length.

realizable.

As described above, according to the present invention, the relative linear motion of the movable mass (4) is controlled by one generator (3°) using the pole screw (8).
A damper can be constructed that converts the rotational motion of the rotor (5) into the rotational motion of the rotor (5), induces an electromotive force in the generator (9), and consumes the voltage as electric power by the load resistance aV.

It is possible to provide a vibration control device with stable performance, good maintainability, easy adjustment of the damping constant 02, and a wide range of damping constants 02 obtained by selecting the lead length of the pole screw (8).

[Brief explanation of drawings]

Figure 1 is a vibration model diagram of a general dynamic damper.
FIG. 2 is a diagram showing an embodiment according to the invention. In the figure, (1) is the vibrating body, (2) is the spring, (3) is the damper, (3
') is the generator, (4) is the movable mass, and (5) is the rotor. (61 is the stator, (7) is the coupling, (8) is the pole screw, (9 is the bearing, aQ is the oak),
(ID is the load resistance. The same symbols in Figure 9 indicate the same or equivalent parts. Agent: Masuo Oiwa Figure 1

Claims (1)

[Claims] (1) A movable mass that reciprocates in the vibration direction on a vibrating body that vibrates in response to an external force, a spring installed between the vibrating body and the movable mass, and a spring mounted between the vibrating body and the movable mass. A vibration control device comprising: a conversion mechanism that converts the relative motion of the above into a rotational motion; a generator that generates an electromotive force by the rotational motion; and a load resistance that consumes the power of the generator. 2) The vibration control device according to claim 17 (6), characterized in that a pole screw is used as a conversion mechanism for converting relative motion into rotational motion.