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Mazzarella, Luca
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Benefit of a Lightweight Frunk

Autoneum Management AG-Federico Di Marco, Flavio Pezzani, Andreas Daving, Luca Mazzarella
Published 2019-06-05 by SAE International in United States
Due to the increasing number of battery electric vehicles (BEVs), the engineering fields regarding driving comfort and NVH issues are becoming more and more challenging: many new factors affect the development of BEVs NVH package. The noise sources related to the powertrain are different from the traditional ones of internal combustion engines, for instance due to the presence of tonal components, strong harmonics and potential whining noise.To satisfy NVH specifications and the need for lightweight solutions to increase driving range, it is important to mask as much as possible the noise coming from the engine bay with materials both lightweight and acoustically performing. Moreover, for electric vehicles new interesting solutions are possible with the introduction of new components that do not find room under the hood of ICE or hybrid vehicles. These components, if properly designed, could lead to significant NVH benefits. The present paper reports the NVH effects of one of these new components, the frunk, a small compartment inside the engine bay, functionally similar to the trunk.In this paper, the design-by-simulation of a…
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Reciprocal Transfer Functions Synthesis Method for Rolling Noise and NVH Floor Treatment Investigations

Rieter Automotive Management AG-Johan Grébert, Luca Mazzarella
Published 2009-05-19 by SAE International in United States
In order to characterize the noise filtering performance of a vehicle with respect to both structure- and airborne transfer paths, a reciprocal transfer functions synthesis method is proposed. Simple, timesaving and repeatable, the procedure is an interesting alternative to the direct measurement.As part of the Vehicle Benchmarking acoustic expertise, the reciprocal transfer function synthesis method is well appropriate to rank different vehicles according to their sound attenuating performances, or to characterize the effectiveness of an acoustic package. As an application example, a sensitivity analysis of the rolling noise transmission with respect to the floor treatment of a vehicle is presented.
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Investigation on the Acoustic Performance of Current Trunk Load Floor Solutions

Rieter Automotive Management AG-Luca Mazzarella, Philippe Godano, Jan Horak
Rieter Automotive North America, Inc.-Hameed Khan
Published 2007-05-15 by SAE International in United States
Different solutions for trunk floors recently presented on the market have been collated and investigated in order to better define the possible features integrated and the acoustic performance of trunk load floors.A description protocol has been devised and applied to systematically categorize the whole set of features potentially characterizing a trunk floor, and the wide range of solutions used with respect to materials, processes and design configurations.The acoustic performance has been specifically addressed with the evaluation of the acoustic absorption on both sides and a specific testing procedure to evaluate the noise insulation capability provided by actual parts.The results of the actual parts acoustic performance measurement campaign show that a substantial improvement in the acoustic function of the trunk floor module can be achieved by the systematic choice of materials, processes, and of the geometry of the part, in compliance with the standard OEMs requirements Some solution trends for vehicle architecture and segment are highlighted, and recommendations to enhance the acoustic performance and the functionality of trunk floors are provided.
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Reciprocal Powertrain Structure-borne Transfer Functions Synthesis for Vehicle Benchmarking

Rieter Automotive Management AG-Luca Mazzarella, Philippe Godano, Jan Horak
Published 2007-05-15 by SAE International in United States
In order to characterize and summarize the structure-borne performance of the body and the NVH treatment of a group of vehicles independently from the type of powertrain, a reciprocal transfer function synthesis procedure is applied with respect to structure-borne noise.Structure-borne transfer functions or Noise Transfer Functions (NTF) are useful to quantify the vehicle acoustic sensitivity to structure-borne noise. Direct NTF measurements are difficult to perform on full vehicle configuration due to modern cars congested engine bays, and often require engine dismantling to take into account all the individual structure-borne routes; traditional impact testing is also time consuming and limited to low frequencies.In the reciprocal approach the full vehicle is acoustically excited in the interior passenger compartment by means of a Low Frequency and a Middle-High Frequency calibrated point sources to cover the whole structure-borne frequency range of investigation: all the transfer paths are thus excited, and measured, simultaneously. This implies a significant reduction in time requirements and an easier testing procedure compared with the direct method. The mechanical responses at the powertrain body mounting points…
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