Active Structural Acoustic Control in an Original A400M Aircraft Structure

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Koehne, C.^1 ; Sachau, D.^1 ; Renger, K.^2

Department of Mechatronics, Helmut-Schmidt-University, Holstenhofweg 85, Hamburg

22043, Germany^1

Airbus Operations GmbH, Kreetslag 10, Hamburg

21129, Germany^2

关键词: Active noise reductions;    Active structural acoustic control;    Blade passage frequency;    Complex coefficients;    Condenser microphone;    Realistic environments;    Signal amplifications;    Signal processing devices;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012185/pdf
DOI  :  10.1088/1742-6596/744/1/012185

来源: IOP

【 摘 要 】

Low frequency noise has always been a challenge in propeller driven aircraft. At low frequencies passive noise treatments are not as efficient as active noise reduction systems. The Helmut-Schmidt-University has built up a full-scale test rig with an original A400M aircraft structure. This provides a good opportunity to develop and test active noise reduction systems in a realistic environment. The currently installed system consists of mechanical actuators and acoustical sensors. The actuators are called TVAs (Tuneable Vibration Absorber) and contain two spring-mass systems whose natural frequencies are adjusted to the BPFs (Blade Passage Frequency) of the propellers. The TVAs are mounted to the frames and the force direction is normal to the skin. The sensors are condenser microphones which are attached to the primary structure of the airframe. The TVAs are equipped with signal processing devices. These components carry out Fourier transforms and signal amplification for the sensor data and actuator signals. The communication between the TVAs and the central control unit is implemented by the CAN Bus protocol and mainly consists of complex coefficients for the sensor and actuator data. This paper describes the basic structure of the system, the hardware set-up and function tests of the controller.