Active Noise Control Experiments in a Fork-lift Truck Cabin

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Linus Andrén, Sven Johansson, Mathias Winberg, Ingvar Claesson
Title: Active Noise Control Experiments in a Fork-lift Truck Cabin
Conference name: 11th International Congress on Sound and Vibration
Year: 2004
City: St Petersburg
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
http://www.tek.bth.se/
Authors e-mail: lar@bth.se, sjo@bth.se, mwn@bth.se, icl@bth.se
Language: English
Abstract: High comfort for the driver in working vehicles is an important feature as well as a demand from the drivers. Low noise level is an essential factor for
the manufacturer to maintain a high standard and comfort of vehicles. In many cases the noise inside the cabin can be related to the engine orders.
Hydraulic pumps and fans are also related to the engine but not necessarily integers of the engine order. Passive absorbers are not suitable for the
lowest frequencies and one approach is to use an active noise control system to solve the noise problem at low frequencies.
In the present experiment loudspeakers were mounted inside the cabin of a fork lift-truck to produce the secondary noise field. To sense the residual noise, microphones were installed close to the driver's head. The aim is to create a zone of reduced noise around the head.
Since a large portion of the noise inside the cabin can be related to the engine, an active control system based on a feedforward solution is possible. Experimental results from a feedforward solution of active noise control in a fork-lift truck cabin show that the noise level in the low frequency region can be
reduced significantly.
Subject: Signal Processing\Active Noise and Vibration Control
Keywords: Active Noise Control
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