# Proposal of Reducing Vibration with M-TRMD for Tubular Structures

Keyword: Life cycle cost for ancillary structure, Academic Proposal, Solution Technology in borderless collaboration

Organizations Involved

○ Hirokazu Hirano, Prof.Ph.D, Faculty of Policy Studies, Chuo University

Kyowa Engineering Consultants Co., Ltd.

☐ Togawa Rubber Co., Ltd.

○ Nakai Corporation

Hirokazu HIRANO, Prof. Ph.D

## 【Abstract】

Professor Hirokazu Hirano joined with Nakai corporation sharing construction, with Togawa rubber manufacturer, with Kyowa engineering consultants design consultant and developed multi-directions tuned rolling mass damper (Called KORO-KORO damper). Adding this to the sign pole and or pillar established for monitoring camera, the inside round mass rolls on on the opposite side with the vibration to receive force from the wind and the traffic impact. Therefore this system reduces a pillar vibration. With this, it is possible to contribute to prevent from the pillar fatigue destruction caused by the vibration and to improve for the monitor visibility.

## [Summary of the technology transfer]

## Technological Impact

1. Efficient reducing vibration control for pillar structures.

2. Available to Multi-direction vibration and to tremor shake.

3. Made of fewer parts than other TMD system.

4. No mechanical potion.

5. Easy attachments to present ancillary structure.

6. Provided with lower price and lower noise than other TMD system

## Market Impact

The CCTV monitoring camera installed on the urban highway watches over the traffic conditions on the road and plays a role of the important information offer such as the rear-end collision prevention by the congestion jam occurrence. However, the problem that the visibility of the camera is obstructed, undergoing influence such as the traffic vibration and with the pillar resonating occurs. Therefore, installing this equipment on the pillar, it was proved that vibration was reduced compared with present system in half. Also, Blurredness of the camera image, too, was reduced. There is not a damper available for there in it, but for a system damper to correspond to the vibration of the various directions like this damper and moreover to install in existing pillars easily, to be low in cost. The public relations works to be introduced to the ancillary structure such as the sign pole and the illumination pillar at the expressway for which it is easy to undergo vibration's influence itself.

## Project Background

The company with each field of which the researcher who enrolls in the university utilized its own personal connections and they were appealed to the same will by him and it approved of the product feasible development gathered.

## Funding History

2001~2006

Chuo University science and engineering institute joint research and science research grant subsidy adoption.

2004~present

Joint research with Nakai corporation and

Togawa Rubber.

## I ntellectual property protection

State of Patent application

Number: 2003-82616

Vibration Control System for Tubular Structures

## Multi-direction Tuned Rolling Mass Damper, alias “Koro Koro Damper”

■ Examination Construction for

ITV Pillars on Site of Metropolitan Expressway Bridges

## Turning point in the Project

This provided research environment to the full in the performance with the researcher with high produce ability.

This grasped social needs accurately and this tackled the development of the product team in the design, at the material, in the installation and the university. So it called "4 in 1 collaboration".