Abstract:
PURPOSE: Environmentally-friendly soundproof wall technology is provided to reduce a wide band of noises through combined use of an adaptive sound field control soundproof device and a solar energy current collector. CONSTITUTION: An adaptive sound field control soundproof device comprises a resonance-type noise reducer(200), an active sound field control part, a solar energy current collector(400), and a soundproof wall(300). The active sound field control part is coupled with the resonance-type noise reducer. The solar energy current collector is attached to the soundproof wall in order to provide power for the soundproof device. The soundproof wall is made of a sound absorption panel or sound-absorbing material which can reduce the amplification of noise due to reflected sound. The active sound field control part is switched on/off according to the frequency band and amplitude of noise caused by a mobile noise source.
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.