Abstract:
PURPOSE: A noise imaging system of transportation machines, a noise imaging method of transportation machines, a defective position determining system of transportation machines, and a defective position determining method thereof are provided to apply the system and the method to an actual industrial site by determining defective positions of the transportation machines by removing an influence of a measurement noise. CONSTITUTION: A microphone array(100) is separated from a bottom surface of a transportation machine. The microphone array measures the sound pressure of an impact noise discharged from the transportation machine. A signal processing unit(400) obtains a noise map without a noise. Photoelectric sensors(200a,200b) are installed in a random position of a path for the transportation machine. The photoelectric sensors measure a relative position of the microphone array by measuring a moving speed and a position. A sound-absorbing material is installed on a surface on which the microphone array is installed.
Abstract:
본 발명은 간섭관을 이용한 소음저감장치에 관한 것으로, 보다 상세하게는 간섭관이 내부에 설치된 스커트 및 근접 방음벽을 이용하여 철도차량의 차륜과 레일로부터 발생되는 전동소음 등의 하부소음을 저감시킬 수 있도록 하는 간섭관을 이용한 소음저감장치에 관한 것이다. 본 발명은 철도차량의 차륜과 레일로부터 발생되는 소음을 저감시키기 위한 소음 저감장치에 있어서, 차체의 하부에 설치되는 방음스커트의 내측에는 제1간섭관이 설치된 것을 특징으로 한다.
Abstract:
PURPOSE: A noise reduction device using an interference tube is provided to efficiently reduce noise generated from the wheels of a railway vehicle and a rail by installing a soundproof skirt having an interference tube to be adjacent to a noise source. CONSTITUTION: A noise reduction device(100) using an interference tube comprises a soundproof skirt(110) and a first interference pipe(112). The soundproof skirt is connected to the bottom of a railway vehicle body and reduces noise generated from the wheels(30) of a railway vehicle and a rail(20). The first interference pipe is installed in the bottom of the soundproof skirt toward the wheels of the railway vehicle and the rail and effectively reduces noise generated from a noise source.
Abstract:
본 발명은 소음 저감용 방음장치에 관한 것으로, 보다 상세하게는 방음벽에 설치되어 자동차 또는 철도차량의 주행시 발생하는 바람을 이용하여 소음의 진행방향을 전환시킴으로써 소음의 회절 현상에 의한 소음전파를 줄일 수 있도록 하는 소음 저감용 방음장치에 관한 것이다. 본 발명은 방음벽에 설치되는 소음 저감용 방음장치에 있어서, 상기 방음벽의 상부에는 바람에 의해 소음의 전파 방향을 전환시키는 소음방향 전환장치가 설치된 것을 특징으로 한다.
Abstract:
PURPOSE: A microphone array for verifying the sound source feature is provided to offer the maximum efficiency of using the same number of microphones by arranging the microphones in an irregular radial shape. CONSTITUTION: A microphone array(100) for verifying the sound source feature includes a jig, microphones(120), a data collection unit(400), and a data processing unit(500). The jig includes plural installation bars arranged in a radial shape. The microphones are installed on the installation bars. The data collection unit is electrically connected to the microphones. The data processing unit processes data collected from the data collection unit. The microphones are installed in an irregular radial shape around the jig.