JPH04129948U - Pendulum type vibration damping device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pendulum-type vibration damping device that is small and can obtain a large damping force at a low cost. [Structure] A swinging rod 2 with a weight 1 attached to its lower end and a swinging rod 2 whose upper end is pivotally suspended from a structure 3 to be damped in a pendulum shape, and a high damping rubber 9 attached to each lower end and oscillated at a required interval. It is composed of a pair of supporting structures 8 which are parallelly attached to the structure 3 with the swinging rod 2 sandwiched therein, and a connecting means 11 which connects the middle of the swinging rod 2 and the high damping rubber 9 in a freely transmitting manner. , characterized.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This project is designed to be attached to structures and used to suppress vibrations occurring in various structures. The present invention relates to a pendulum-type vibration damping device.

0002

[Conventional technology]

It is known that vibration of a structure can be suppressed by using a pendulum. death However, in order to increase the damping effect of the pendulum and put it into practical use, various measures are required. Ru. Above all, at least adjusting the natural frequency of the pendulum's swing, and Absorbing vibrational energy is essential.

0003 Therefore, the conventional pendulum-type vibration damping device A has a weight 1 attached to the lower end as shown in Fig. 4. The upper end of the swinging rod 2 is pivotally suspended from the pin support 4 that is attached to the structure 3, and a pendulum is created. On the other hand, a pair of left and right support structures 5 sandwiching the swinging rod 2 with a required distance between them is attached to the structure 3 in parallel, and a fixed It is common to install a spring 6 for frequency adjustment and a damper 7 for energy absorption. This is an example.

0004

[Problem that the idea aims to solve]

However, it is best to use a coil spring for spring 6 and an oil damper for damper 7. However, both are expensive. Furthermore, if a large damping force is required, the spring 6, damper 7, and support The size of structure 5 becomes large, which creates manufacturing difficulties and limits the installation space. However, in reality, it is difficult to handle large vibrations such as those caused by a major earthquake. It is difficult to apply this method in cases where vibration suppression is required. In this case, the present proposal is an inexpensive pendulum-type vibration damping device that is small and can obtain a large damping force. We aim to provide the following.

[0005]

[Means to solve the problem]

The solution to the above problem is to adopt the new characteristic configuration means listed below in the main proposal. This is achieved by In other words, the first feature of this proposal is that the upper end of the swinging rod with a weight attached to the lower end is the object of vibration damping. A pair of supports suspended from the structure in a pendulum shape, each with high damping rubber attached to the lower end. While opening the structure at a required interval and sandwiching the swinging rod therein, the structure is attached in parallel to the structure, A pendulum-type vibration damping device in which the middle of the swinging rod and the high-damping rubber are connected in a freely transmitting manner. It is.

[0006] The second feature of this proposal is that the upper end of the swinging rod, whose lower end is pivoted to the center of the weight plate, is targeted for vibration damping. is suspended from a structure in a pendulum shape, while both sides or corners of the weight plate and the structure Suspending the swinging rod in parallel across the space with a suspension string, and interposing the swinging rod therein. Then, a high damping rubber is placed on the pedestal fixed on the weight plate, and on the other hand, the high damping rubber is placed in the oscillating rod. This is a pendulum-type vibration damping device in which the high damping rubber and the high damping rubber are connected in a freely transmitting manner.

[0007]

[Effect]

This proposal takes the above-mentioned measures, so in a vibration damping device using a pendulum, the vibration Used for adjusting the natural vibration frequency of the pendulum and absorbing the vibration energy generated in the pendulum. Utilizes the viscoelastic properties of damping rubber. As a result, in the conventional technology, the spring 6 is used to adjust the natural frequency, and the vibration energy is Damper 7 was used to absorb energy, but in this project, this part has both functions. A high-damping rubber with strong properties is used.

[0008]

【Example】

Embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a conceptual diagram explaining the first embodiment of the present invention, Figure 2 is an enlarged slope view of the main part, Figure 3 FIG. 2 is a conceptual diagram illustrating a second embodiment of the present invention. In the figure, B and C are the pendulum type vibration damping device of this embodiment, 8 is the support structure, 9 is high damping rubber, 10 is an oscillating rod connection part, 11 is a connecting means such as a string, rod, wire, etc. that can transmit the transmission as appropriate, and 12 is a A weight plate 13 is a rope that suspends both sides or corners of the weight plate 12 in parallel to the swinging rod 2. , rods, wires, or other means of suspension. Note that the same members as those in the conventional pendulum type vibration damping device A shown in FIG. 4 are given the same reference numerals.

[0009] (Example 1) A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The pendulum type vibration damping device B of the first embodiment includes a weight 1, a swinging rod 2, a structure 3, and a pin support. The swinging rod 2 is made up of a section 4, a hook-shaped support structure 8, and a high damping rubber 9, and a weight 1 is attached to the swinging rod 2. The pin support part 4 is made of a universal joint or the like whose upper end is attached to the structure 3. The weight 1 is pivotally supported and suspended from the structure 3 to form a pendulum, while the support structure 8 is suspended from the structure 3. A flange-shaped attachment part 2a formed in the middle part of the swinging rod 2 with the swinging rod 2 sandwiched therein and fixed vertically. and the oscillating rod connection part 10 attached to the lower end of the high damping rubber 9 with a string, rod, wire, etc. This is a structure in which a freely transmittable connecting means 11 is used.

0010 (Example 2) A second embodiment of the present invention will be described with reference to FIG. The pendulum-type vibration damping device C of the second embodiment includes a weight board 12, a swinging rod 2, a structure 3, and a pin. It consists of a support part 4, a high damping rubber 9, a suspension means 13, a weight plate connecting part 14, and a pedestal 15. , by the center of the weight plate 12 and the weight plate connecting part 14 by a universal joint, etc. A universal joint in which the upper end of the swinging rod 2, whose lower end is pivotally connected to the structure 3, is attached to the structure 3. The suspension ring 16 of the weight board 12 and the suspension ring 1 of the structure 3 are 7 by the suspension means 13 to form a pendulum, while on the weight plate 12 A high damping rubber 9 is mounted on a pedestal 15 which is fixed symmetrically with the swinging rod 2 held therein, and on the other hand, A flange-shaped attachment part 2a formed in the middle part of the swinging rod 2 and a swinging rod attached to the upper end of the high damping rubber 9. A connecting means 11, such as a string, a rod, or a wire, which can appropriately transmit power, is interposed between the connecting part 10 and the connecting part 10. Ru.

[0011] The specifications of this example show such a specific implementation, so it is possible to obtain a large damping force with a small size. The reason for this is explained below. For example, with a pendulum weight of about 500 kgf, the maximum acceleration generated in the structure is about 3 G. When trying to suppress vibrations during a major earthquake, the natural frequency of the pendulum should be set to around 3Hz. When adjusting and trying to absorb vibration energy with a damping constant of about 5%, Conventional technology generally uses steel wire with a diameter of 5.5 cm, which is 30 cm in diameter and 70 cm in length. Two coil springs of about 60cm and an oil damper of about 30cm in diameter and 100cm in length. -7 Two pieces are required. Manufacturing such large springs 6 and dampers 7 It is well known that this requires advanced technology and is expensive.

0012 In this embodiment, a high damping rubber 9 is used in place of the spring 6 and damper 7. High damping rubber with rigidity of 150 kgf/cm and equivalent damping constant of 5 to 15%. When rubber is used as a material, two pieces of high damping rubber with a width and height of about 20cm are used. It will be a good thing. High damping rubber 9 with properties and size of this level is easily manufactured. It is possible. As can be seen from the above, high damping rubber 9 is used instead of spring 7 and damper 8. As a result, the size of this part is less than 1/10 of the volume, and it is clear that It is possible to make the damping device smaller than conventional devices.

[0013]

[Effect of the idea]

Thus, the present invention is a vibration damping device that uses a pendulum, and it is possible to adjust the natural frequency of the pendulum's oscillation. The viscoelastic properties of high-damping rubber are used to absorb the vibration energy generated in pendulums and pendulums. It has the advantage of being small and easy to obtain a large vibration damping force, especially when It is extremely useful in cases where large vibrations such as those caused by earthquakes are to be suppressed, and Demonstrates excellent practicality and usefulness such as being economical.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a first embodiment of a pendulum-type vibration damping device of the present invention.

FIG. 2 is an enlarged perspective view of the periphery of the collar-shaped attachment part in the same as above.

FIG. 3 is a conceptual diagram showing a second embodiment of the pendulum-type vibration damping device of the present invention.

FIG. 4 is a configuration diagram of a conventional pendulum-type vibration damping device.

[Explanation of symbols]

A, B, C... Pendulum type vibration damping device 1... Weight 2...Swinging rod 2a...Brim type mounting part 3...Structure 4...Pin support part 5, 8...Support structure 6...Spring 7...Damper 9...High damping rubber 10...Swinging rod connection part 11...Connection means 12... Weight board 13... Hanging means 14... Weight plate connection part 15...cradle 16, 17...Hanging ring

Claims (2)

[Scope of utility model registration request] Claim 1: The upper end of a swinging rod with a weight attached to the lower end is pivotally suspended from the structure to be damped in a pendulum shape, and a pair of support structures each having a high damping rubber attached to the lower end are arranged at a required interval. while opening the swinging rod, sandwiching the swinging rod therein and attaching it to the structure in parallel;
A pendulum-type vibration damping device characterized in that the middle of the swinging rod and the high damping rubber are connected in a freely transmitting manner. [Claim 2] The upper end of a swinging rod whose lower end is pivotally connected to the center of the weight plate is pivotally suspended from a structure to be damped in a pendulum shape, while the upper end of the swinging rod is pivotally suspended from the structure to be damped in a pendulum shape. Suspended between the structures by a suspension means in parallel with the swinging rod, a high damping rubber is mounted on a pedestal fixed on the weight plate with the swinging rod sandwiched therein, and the other A pendulum-type vibration damping device according to claim 1, characterized in that an intermediate portion of the swinging rod and the high damping rubber are connected in a freely transmitting manner.