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Kolano and, United States

Saha P.,Kolano and Saha Engineers Inc | Haylett J.,Commercial Vehicle Group Inc. | Roy R.K.,Nutek Inc
SAE International Journal of Materials and Manufacturing | Year: 2013

This paper discusses a design of experiments (DOE) analysis that was performed to understand relevant factors that influence the acoustic performance of a sound package part used in the commercial vehicle industry for the floor mat application. The acoustic performance of the sound package part which is a double wall system and constructed of a barrier and cellular decoupler material is expressed in terms of sound transmission loss (STL). An experiment was designed using the Taguchi DOE technique with three factors and three levels to acquire the STL data and is discussed in the paper. The results of the DOE analysis and the confidence in the model are discussed as well as the benefits of predicting expected STL performances are mentioned in the paper. © 2013 SAE International. Source


Saha P.,Kolano and Saha Engineers Inc
Sound and Vibration | Year: 2011

This article discusses the thought process that one needs to go through for developing an appropriate sound package treatment for a vehicle. In the development process, you need to put proper emphasis on understanding the source, path, and the receiver system. You need to have an understanding of how to reduce the noise at each location. You may need to conduct a feasibility study of the benefits of various noise control options. In terms of sound package treatments, you need to understand the fundamentals of acoustical materials, how they work, and why one material performs differently than another, as well as the importance of a well documented specification that every supplier has to meet. Source


Saha P.,Kolano and Saha Engineers Inc
SAE Technical Papers | Year: 2011

This paper discusses the thought process that one needs to go through for developing an appropriate sound package treatment for a vehicle. In the development process one needs to put proper emphasis on understanding the source, path, and the receiver system. One needs to have an understanding on how to reduce the noise at the source, path, and/or receiver location. One may need to conduct a feasibility study of the benefits of various noise control options. In terms of sound package treatments one needs to understand the fundamentals of acoustical materials how they work and why one material performs differently than another one, as well as the importance of a well documented specification that every supplier has to meet. Copyright © 2011 SAE International. Source


Kolano R.,Kolano and Saha Engineers Inc
SAE Technical Papers | Year: 2013

This paper presents the design, construction, and implementation of a novel sound transmission loss (STL) testing fixture that is unique to the automotive industry. This fixture was built within a large 1.68 m high × 2.74 wide (56 × 90) opening in the wall between a 497 m3 (17,591 ft 3) reverberation room and an adjacent anechoic chamber. The fixture was designed and built to accommodate interchangeable plugs that allow STL measurements on an automotive buck as well as on flat sample materials. It features a removable sample holding frame system that simply and quickly clamps in place and acoustically seals with a pneumatically inflated seal. Copyright © 2013 SAE International. Source


Deshpande S.P.,Kolano and Saha Engineers Inc | Rao M.D.,Tennessee Technological University
ASEE Annual Conference and Exposition, Conference Proceedings | Year: 2014

Traditional methods of measuring sound absorption coefficient and sound transmission loss of acoustic materials and treatments are time-consuming and expensive. To overcome this limitation, normal incidence sound absorption and transmission loss measurement technique using an impedance tube was developed. Unfortunately this equipment is equally expensive. This paper presents an effort made to develop a cost-effective impedance tube for wider use especially for educational use in emerging countries. An impedance tube capable of measuring absorption coefficient and transmission loss is designed and built under a budget of $1500 suitable for educational institutions in developing countries. The design, development and fabrication of the low-cost impedance tube along with measurement results demonstrating its accuracy is presented. Using a calibrated acoustic sample, data obtained from the low-cost impedance tube were compared with those from a standard commercial tube with encouraging results. A parametric study was conducted showing the effects of various parameters on the accuracy of the measured results. These include tube material, tube dimensions, frequency range, source transducer, pressure-microphones, sample and microphone holder, data acquisition and reduction technique. Based on these, design options were generated to meet the cost and functionality targets pre- Assigned. A list of suggested parts and vendors is also included for anyone interested to custom-build the tube. © American Society for Engineering Education, 2014. Source

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