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.
Highlights
The vehicle interior noise characteristic is one of the main important passenger comfort criteria and is a focal point within a passenger car development process
Active front axle subframe mounts are developed and integrated in a middle-sized passenger car to reduce the interior noise caused by road excitation
Four active subframe mounts based on piezoelectric actuators are designed, validated and integrated into the car-body
Summary
The vehicle interior noise characteristic is one of the main important passenger comfort criteria and is a focal point within a passenger car development process. Regarding vehicle dynamics, a rather stiff connection between chassis suspension and car-body is preferred To overcome this conflict of objectives in this paper, an active mount chassis system is proposed, whereas the integration of a vibro-acoustic active system into the chassis construction to compensate broadband rolling noise is a rather novel research approach. Reduction of vehicle interior noise and optimization of vibrational acoustical comfort by minimization of the dynamic loads under varying operational conditions, benchmark of vibro-acoustic isolation systems and expansion of current technical applications, high static mount stiffness and the ability to apply dynamic forces with structure integrated piezoelectric actuators, solving the conflict between vehicle dynamics and acoustical comfort. The suggested design procedure is applicable to a variety of other advanced problems in active noise and vibration engineering
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