抄録
A Japanese construction machine industry maker proud of the trust of the world top-class but, in the rising nation which the companies make much of as a market, a Hydraulic pressure construction machine operates for 24 hours. A crack happens for it in the Hydraulic pressure source pipe flange part of the machine and causes the problems such as declines of the work efficiency. In this study, it is intended to prevent an occurring crack by a control on vibration device and evaluates the control on vibration effect of the device at the development stage. In the study of damping properties using the device vibration hydraulic fittings system, it was confirmed by experiment to suppress the damping of mouth metal part of the pipe and return discharge pipe of the hydraulic power source pipe to do with each other under reduced pressure and the pressure, shows the results obtained below. The inclusion of the damper Cu ball 3 [mm], of 100[g], as compared with the case without the device, it becomes a peak gain value of 7.66[dB], and could 9.3 [dB] low that from the peak value in the case of a single.
