Development and Implementation of a Multi-Channel Active Control System for the Reduction of Road Induced Vehicle Interior Noise

Abstract

An optimized driving comfort with a low interior noise level is an important intention in the passenger car development process. The interior noise level caused by the dynamic interaction between the rolling tyre and the rough road surface and transmitted via the car-body is a significant component of the entire noise level. To reduce the road induced interior noise, in general, the chassis system has to be optimized. Passive measures often induces a trade-off between vehicle dynamics and driving comfort. To overcome this disadvantage in this paper, the development and realization of an active measure is proposed. For the purpose of active mechanical decoupling, an active control system is developed, the feasibility of the integration is investigated and its noise reduction potential is identified by vehicle tests. In a first step, a classical multi-channel and experimental-based structure-borne transfer path analysis of the full vehicle is realized to determine the dominant transfer paths. The concept for the active mount system (active mounts, multi-channel control system, sensors) is developed and parametrized by system level simulation. Mechanical components and power electronics of the active system are designed, manufactured and tested in the laboratory. Subsequently, the entire active system is integrated into the vehicle. The broadband adaptive feedforward algorithm is extended by certain measures in order to improve robustness and performance. Full vehicle tests are used to quantify the required specifications and the achieved effectiveness of the active vibration control system.

Nonlinear Neural System for Active Noise Controller to Reduce Narrowband Noise

“…, and the latter is selected based on a third-order polynomial model [40][41][42] 3 , and the nonlinear secondary path is given by a Volterra series [43] y ′ (n) � y(n) + 0.35y(n − 1) + 0.09y(n − 2) − 0.5y(n)y (n − 1) + 0.4y(n)y(n − 2), according to Figure 5. e frequencies of the three narrowband components (i � 1, 2, 3) are 100 Hz, 200 Hz, and 400 Hz at first and suddenly changed to 150 Hz, 250 Hz, and 300 Hz at the 5 th second.…”

“…Gäbel et al proposed a multichannel active control system to reduce vehicle interior noise on the road. e proposed algorithm reduced the level of structural vibration and vehicle interior noise under the operating conditions [3]. Wang et al proposed active control using the discrete wavelet transform (DWT) based FXLMS algorithm with a piezoelectric feedback system to cope with the stationary and nonstationary noises in a simplified vehicle cavity model [4].…”

Small Changes in Vehicle Suspension Layouts Could Reduce Interior Road Noise

“…Electric active suspension systems are able to reduce vibrations up to 5 Hz [13] (p. 45) by changing stiffness and damping of the suspension in order to optimize NVH and driving dynamics performance, depending on the current driving situation. Recent developments use piezo-electric subframe mounts to reduce structure-borne noise [14]. Active Noise Cancelling (ANC) systems reduce narrow bands like engine orders or broadband noise by the use of loudspeakers in the passenger compartment [15] (pp.…”

Noise Reduction in Spur Gear Systems

“…Its exact position was 80 mm below the midpoint of the wheelbase of the two wheels. Both the distance of 80 mm as that of a meter has no particular meaning because they are used only as reference points to study the sound variations [ 45 , 46 , 47 ]. These values were only set as references to allow a comparison between the various analyses under equivalent conditions.…”