A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
NOISE REDUCTION DEVICE AND CONSTRUCTION MACHINE
To provide a noise reduction device and a construction machine, which can reduce noise from a low frequency band to a high frequency band with a simple structure.SOLUTION: In a noise reduction device 3, noise absorbers 9 are disposed at an inner wall of a duct 4 having a connection port 41 and an opening 42. The duct 4 is arranged in a construction machine 1 so that the connection port 41 is connected to a muffler of the construction machine 1. The duct 4 comprises a speaker 5 outputting control sound Y between the connection port 41 and the opening 42, and a microphone 6 is arranged between the speaker 5 and the opening 42. A controller 7 is connected to the microphone 6 and the speaker 5, receives a sound signal corresponding to residual noise Z2 from the microphone 6 and generates a control signal for controlling the control sound Y by inverting a phase of the sound signal to transmit the signal to the speaker 5.SELECTED DRAWING: Figure 1
【課題】簡単な構成で低周波帯域から高周波帯域までの騒音を低減できる騒音低減装置及び建設機械を提供すること。【解決手段】騒音低減装置３は、接続口４１と開口部４２を備えるダクト４の内壁に、騒音吸収材９が設けられている。ダクト４は、接続口４１を建設機械１のマフラーに接続するように、建設機械１に設置される。ダクト４は、接続口４１と開口部４２との間に制御音Ｙを出力するスピーカ５が設けられ、そのスピーカ５と開口部４２との間に、マイク６が配置されている。制御装置７は、マイク６とスピーカ５に接続されており、マイク６から残留騒音Ｚ２に対応する音響信号を受信して、その音響信号を逆位相にすることにより、制御音Ｙを制御する制御信号を生成し、スピーカ５に送信する。【選択図】図１
NOISE REDUCTION DEVICE AND CONSTRUCTION MACHINE
To provide a noise reduction device and a construction machine, which can reduce noise from a low frequency band to a high frequency band with a simple structure.SOLUTION: In a noise reduction device 3, noise absorbers 9 are disposed at an inner wall of a duct 4 having a connection port 41 and an opening 42. The duct 4 is arranged in a construction machine 1 so that the connection port 41 is connected to a muffler of the construction machine 1. The duct 4 comprises a speaker 5 outputting control sound Y between the connection port 41 and the opening 42, and a microphone 6 is arranged between the speaker 5 and the opening 42. A controller 7 is connected to the microphone 6 and the speaker 5, receives a sound signal corresponding to residual noise Z2 from the microphone 6 and generates a control signal for controlling the control sound Y by inverting a phase of the sound signal to transmit the signal to the speaker 5.SELECTED DRAWING: Figure 1
【課題】簡単な構成で低周波帯域から高周波帯域までの騒音を低減できる騒音低減装置及び建設機械を提供すること。【解決手段】騒音低減装置３は、接続口４１と開口部４２を備えるダクト４の内壁に、騒音吸収材９が設けられている。ダクト４は、接続口４１を建設機械１のマフラーに接続するように、建設機械１に設置される。ダクト４は、接続口４１と開口部４２との間に制御音Ｙを出力するスピーカ５が設けられ、そのスピーカ５と開口部４２との間に、マイク６が配置されている。制御装置７は、マイク６とスピーカ５に接続されており、マイク６から残留騒音Ｚ２に対応する音響信号を受信して、その音響信号を逆位相にすることにより、制御音Ｙを制御する制御信号を生成し、スピーカ５に送信する。【選択図】図１
NOISE REDUCTION DEVICE AND CONSTRUCTION MACHINE
騒音低減装置及び建設機械
SHINTO MINEKI (author) / YANASE KAZUYA (author)
2019-03-14
Patent
Electronic Resource
Japanese
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