The 2007 Dodge Nitro 2.8L Turbo Diesel sports a unique wide-band resonator from Woco Motor Acoustic Systems USA Inc. that captured top honors in last night’s Society of Plastics Engineers Automotive Division “Most Innovative Use of Plastics” Award in the powertrain category.

Made with DuPont™ Zytel® nylon 66, this breakthrough resonator silences “turbo-whine,” eliminates insulation material for a significant cost savings and improves durability by integrating injection molded high and low frequency parts into a single assembly. The integrated component is extendable to any charged or uncharged air induction system.

“Wide-band silencing technology increasingly is used to help eliminate induction noises in the engine compartment,” said Udo Gaertner, vice president of Woco Motor Acoustics, Inc. “A wide-band silencer – which places several resonating chambers in a series to filter unwanted frequencies – is truly an innovative way for automakers to tune the sound they desire.”

This new resonator reduces both high and low frequency noise to help automakers meet higher standards for pass-by noise emissions, such as those in Japan and Europe. Additionally, since the resonator attenuates noise at the source, additional insulation material becomes redundant, leading to significant cost savings.

Unlike conventional designs, this wide band resonator is not constrained by location and can therefore be used in multiple applications and positions in the engine. This allows the resonator to extend to a variety of applications both in automotive and non-automotive applications. Furthermore, the resonator reduces weight by about 30 percent compared to a traditional resonator set up that reduces the noise at the same level as the Woco solution does.

Zytel® nylon 66 was selected for the application due to a unique combination of mechanical and thermal properties which enables the resonator to work in the demanding compressor side environment, high-pressure, high-temperature and oil mist. “Zytel® provides advantages in both the injection molding process as well as during the ultrasonic welding assembling,” said Gianluigi Molteni, DuPont Automotive global powertrain segment manager. “Material characteristics, low creep and dimensional stability enable tight tolerances critical to the acoustic sensitiveness of the resonator.”

DuPont is a science-based products and services company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture and food; building and construction; communications; and transportation.

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For a high resolution image of the resonator, click here.

Caption:  The turbo resonator, developed by Woco Motor Acoustics using DuPont Zytel®, was awarded “Most Innovative Use of Plastics” by the Society of Plastics Engineers. The resonator eliminates insulation materials by integrating high and low frequency parts into a single assembly while silencing “turbo whine”.

To hear a recording  with and without the resonator, click on these sound files:

w_res.au and wo_res.au

Dodge® is a registered trademark of DaimlerChrysler Corporation.

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