Volume 5 • Issue 1 • 1000132 Adv Automob Engg ISSN:2167-7670 AAE, an open access journal Open Access Research Article Aydin and Esenboga, Adv Automob Eng 2016, 5:1 DOI: 10.4172/2167-7670.1000132 *Corresponding author: Kadir Aydin, Department of Automotive Engineering, Çukurova University, 01330 Adana, Turkey, Tel: 3386600-3636; E-mail: kdraydin@cu.edu.tr Received March 11, 2016; Accepted March 31, 2016; Published April 02, 2016 Citation: Aydin K, Esenboga F (2016) Improvement of the Heat and Sound Insulation of a Bus for Compliance with American Regulations. Adv Automob Eng 5: 132 doi:10.4172/2167-7670.1000132 Copyright: © 2016 Aydin K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Abstract In this study, heat, noise and vibrations of 3-axle bus which was produced according to the American regulations were determined. Insulation designs were made according to heat levels, intensity of noise and vibration and frequency. Comfort conditions inside the bus and the American regulations outside the bus were provided. Heat sources of the bus were detected. Insulations which are able to prevent the heat generated by those sources to reach passenger cabin and other badly affected areas. Maps of noise and vibration of bus is determined, according to the intensity, wavelength and frequency of the noise, using these data more insulation designs were made to reach more comfortable and quieter bus. Improvement of the Heat and Sound Insulation of a Bus for Compliance with American Regulations Kadir Aydin 1* and Furkan Esenboga 2 1 Department of Automotive Engineering, Çukurova University, 01330 Adana, Turkey 2 Temsa Global Bus Factory Adana, Turkey Keywords: Noise, Vibration; Harshness; Insulation; Frequency; Resonance Introduction Vehicle noise and vibration performance is an important vehicle design validation criterion, since it signifcantly afects the overall image of a vehicle. Noise and vibration degrade the driver’s and passengers’ comfort and induce stress, fatigue and feelings of insecurity. Modern vehicle development requires noise and vibration refnement to deliver the proper level of customer satisfaction and acceptance. It is common for a customer’s perception of vehicle quality to relate closely to the noise and vibration characteristics of the vehicle [1]. Globalization combined with increased competition in the marketplace requires a vehicle’s noise and vibration characteristics to be well optimized. Te sound present in the interior of a vehicle consists mainly of power train noise, road noise and wind noise. Given the increased market demand for lighter and more powerful vehicles, it becomes evident that power train induced noise is a key component of the vehicle’s interior noise. Automotive manufacturers are increasing the number of power trains available on vehicle programs because of the potential for improved fuel economy. For example, diesel-powered vehicles are one of the popular alternatives in the global automotive market. Tis presents and further complicates a unique set of noise and vibration challenges that need to be solved during the vehicle development process. Tis means not only eliminating squeaks and rattles and suppressing overall noise levels, but also tuning the sound of the automobile to refect the high quality and distinction of the brand. Noise, vibration and harshness (NVH) have become increasingly important as a result of the demand for increasing refnement. Vibration has always been an important issue closely related to reliability and quality. Noise is of increasing importance to vehicle users and environments. Harshness is related to the quality and transient nature of vibration and noise. Noise and vibration problems may originate from systems such as the engine, pumps, drive train, wheels and tires, or may be related to system integration issues, for example matching between power train and body and between chassis and body. Controlling vibration and noise in vehicles poses a severe challenge to designers because motor vehicles have several sources of vibration and noise which, being interrelated and speed dependent, are diferent from many machine systems. Vehicle noise and vibration refnement has been considered essential for vehicle designated development because of legislation, marketing needs and customer expectations. In order to minimize the impact of the automobile on the environment, legislation has become increasingly demanding on vehicle noise emission and vibration controls. Noise and vibration refnement distinguishes a vehicle from its competitors, thereby attracting new customers [1]. Vehicle refnement encompasses noise and vibration refnement, ride and drive ability. Vehicle refnement afects the customer’s buying decision and the business of selling passenger cars, as it directly afects the driving experience. A refned vehicle should have the following characteristics: • High ride quality • Good drive ability • Low wind noise • Low road noise • Low engine noise • Idle refnement (low noise and vibration) • Cruising refnement (low noise and vibration, good ride quality) • Low transmission noise • Low levels of shake and vibration • Low levels of rattles, squeaks and sizzles • Low level of exterior noise of good quality • Low level of interior noise of good quality • Noise that is welcome as a ‘feature’. Advances in Automobile Engineering A d v a n c e s i n A u t o m o b i l e E n g i n e e r i n g ISSN: 2167-7670