NOISE SUPPRESSING STRUCTURE OF CABIN

摘要

The purpose of the present invention is to change hollow resonance frequency in a cabin without changing the dimensions of the cabin and not providing any partition in the cabin. The present invention provides noise proof structure of a cabin reducing furry noise so as to improve livability and comfortability for an operator. A resonator resonating at frequency of hollow resonance is provided at a position at which sound pressure is high when the hollow resonance occurs. A rotary sensor 44 measuring rotary speed of an engine 50 of the working machine or the like having the cabin, an actuator 46 opening and closing a partition 41 at the opening, and a controller 45 controlling the partition 41 through the actuator 46 corresponding to the rotary speed measured by the rotary sensor 44 are provided.