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Experimental study on active noise and active vibration control for a passenger car using novel piezoelectric engine mounts and electrodynamic inertial mass actuators

: Kraus, Roman; Millitzer, Jonathan; Hansmann, J.; Wolter, Stefan; Jackel, Marco

25th International Conference on Adaptive Structures and Technologies, ICAST 2014 : The Hague, The Netherlands, 6 - 8 October 2014
Red Hook, NY: Curran, 2015
ISBN: 978-1-63439-808-4
International Conference on Adaptive Structures and Technologies (ICAST) <25, 2014, The Hague>
Fraunhofer LBF ()
noise; Adaptronik; Mechatronik

Active noise control (ANC) is an efficient technique to reduce noise of passenger cars using a cancelling anti-noise waveform, which is introduced by additional secondary sources. In the same way, engine caused vibrations which are transferred from the mounts and the adjacent structures. This results in reduced driving comfort and can be enhanced either by active vibration control (AVC) or active noise control (ANC) strategies. To show the potential of AVC, a medium-class passenger car is equipped with an active engine mount featuring a piezoelectric actuator and three additional inertial mass actuators (IMAs) located at the mounting positions of the combustion engine. The active engine mount as well as the inertial mass actuators are used to compensate engine induced vibrations close to the source. Besides the AVC system, a loudspeaker based ANC concept for reduction of interior vehicle noise is investigated. Here, the conventional loudspeaker system is extended by a subwoofer mounted in the trunk. Due to the fact that the distortion is mainly correlated to the rotational speed of the engine, both concepts use a feedforward control algorithm in an adapted topology for the compensation of harmonic disturbances. The integration of both measures in a single test vehicle enables a comparison of different active concepts for the improvement of noise, vibration and harshness (NVH) under real driving conditions and an investigation of different strategies for the development and system integration of active NVH components. Experimental results for vehicle road tests of the AVC concept and the ANC concept are discussed in a comparative analysis. Key aspects of this experimental study are vibration reduction at the engines' mounting positions and vehicle interior noise reduction. Based on these results an evaluation of the achievable benefit is carried out for both concepts.