Design & Development of Helmholtz Resonator for Low Frequency Exhaust Noise Reduction in Commercial Vehicles VE Commercial Vehicles, Limited

Format:

Book

Conference/Event

Author/Creator:

Kasliwal, Rajat, author.

Contributor:

Jadhav, Sourabh

Saxena, Saahil

Conference Name:

Symposium on International Automotive Technology (2021-09-29 : Pune, India)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

In recent times there has been rising demand for noise level reduction in commercial vehicles. Vehicle engine exhaust system is one of the key sources of noise at driver ear, especially in smaller wheel base vehicles, as well as critical for meeting pass by noise regulations. Several techniques are used to reduce the noise level of an exhaust system such as resonators, dissipative mufflers for low and high frequencies respectively. In this paper sound transmission loss (STL) measurement for a LMD bus exhaust system was carried out at rig level. It has been found from the measured data that noise attenuation of current exhaust system is poor in low frequency zone and therefore lower STL frequencies were identified. To attenuate the noises at identified frequencies Helmholtz resonator was introduced, which is particularly effective for low frequency noise attenuation. A design is conceptualized and developed based on Helmholtz resonator calculation for target frequencies and duty cycle gas temperatures. Further, effect of designed resonators on exhaust back pressure in CFD was analyzed. Prototypes were developed and NVH performance trials were carried out at vehicle level. It has been observed from the results that noise reduction can be achieved at passenger ear level (PEL) and in pass by noise (PBN) test. This paper covers complete NVH development cycle for a real-time noise scenario id est measurements and analysis, design, development and final verification on vehicle level. It explains possible measures for decreasing exhaust noise and can be used as guideline for related applications

Notes:

Vendor supplied data

Publisher Number:

2021-26-0279

Access Restriction:

Restricted for use by site license