413 解体重機用多段マスダンパーの研究開発

Abstract

In recent years, because of demand for rebuilt the building that were constructed in high economic growth period (1960s), demolition work is carried out energetically in many places in Japan. Heavy equipment such as excavators is commonly used to the demolition work. However, the excavators generate uncomfortable vibration to neighbors. Therefore, the purpose of this study is research and development of vibration control device for excavators. A Tuned Mass Damper (TMD) is most commonly used for vibration control. Usually the TMD is tuned by using optimal design formula depending on the weight and the stiffness of the control target. However the tuning violated if the parameters of the control target are changes. In order to solve this problem, a Multiple Tuned Mass Damper (MTMD) is proposed in this study. The MTMD consists of a primary mass and secondary mass. The secondary mass is placed on the primary mass in series. Applying the secondary mass can widen the effective target frequency range of vibration control. In this paper, compared the performance of MTMD and TMD in numerical simulation. Then, prototype MTMD was fabricated and its performance was verified experimentally. As a result, it is confirmed that the prototype MTMD has effect in vibration control for excavator.