Active Control of Elevator Noise from Ventilator
Wednesday 1st March 1995
Noise emitted from an elevator ventilation duct into a car is reduced by using active noise control. This paper describes the problems inherent in duct design for active noise control, and the relationship between flow velocity, sound coherence in space, and the effect of noise reduction. By adopting the proposed technology, nose was reduced by 10 dB (35-500Hz) at the evaluation microphone point. The results obtained constitute a major advance toward the commercialization of elevators using active noise control.
- Author(s): Katsuyoshi Nagayasu, Akihiko Okamura and Nobuhiko Teshima
- Title: Active Control of Elevator Noise from Ventilator
- Year: 1995
- Publication Name: Elevator Technology
- City: Hong Kong