Vehicle Interior Noise Prediction Using Sound Intensity Measurement PDF Download

Author: H. Saito
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 8

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Book Description

Author: Florian Doleschal
Publisher: Logos Verlag Berlin GmbH
ISBN: 3832555900
Category : Science
Languages : en
Pages : 174

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Book Description
The interior sound of vehicles is a major criterion when buying a new or used vehicle. For both pure-electric and hybrid vehicles, separately audible tonal components severely influence the pleasantness of the interior sound. Previous studies revealed that for sounds of vehicles with electrified drives, besides the tire-road and wind noise components, mainly higher-frequency tonal components influence the pleasantness. Within the present work, the audibility of those components has been determined by a modified version of an auditory masking model. For those vehicles, disturbing sound components are usually prominent during transient driving conditions. Therefore, the temporal changes of psychoacoustic parameters should be considered for the pleasantness prediction. A long short-term memory neural network depicts the relationship between time series of psychoacoustic parameters and a single value of pleasantness, which has been acquired by conducting auditory experiments with both original and augmented electric and hybrid vehicle interior sounds. The general scope of the dissertation is to develop a model of pleasantness for interior sounds of vehicles with electrified drives using a long shortterm memory model approach. The predictions form the basis for constructive countermeasures or active sound design concepts to improve the pleasantness of the interior sound.

Author: Shuji Hata
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 12

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Book Description

Author: Pranab Saha
Publisher: SAE International
ISBN: 0768099463
Category : Technology & Engineering
Languages : en
Pages : 320

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Book Description
What is acoustics? What is noise? How is sound measured? How can the vehicle noise be reduced using sound package treatments? Pranab Saha answers these and more in Acoustical Materials. Acoustics is the science of sound, including its generation, propagation, and effect. Although the propulsion sources of internal combustion engine (ICE) vehicles and electric motor-powered vehicles (EV) are different and therefore their propulsion noises are different, both types of vehicles have shared noise concerns: Tire and road noise Wind noise Vehicle noise and vibration issues have been there almost from the inception of vehicle manufacturing. The noise problem in a vehicle is very severe and is difficult to solve only by modifying the sources of noise and vibration. Sound package treatments address the noise and vibration issues along the path to reduce in-cabin noise. In Acoustical Materials, readers will grasp the science of reducing sound and vibration using sound absorbers, sound barriers, and vibration dampers. Sound provides information on the proper operation of the vehicle, but if unchecked, can detract from the consumer experience within the vehicle and create noise pollution outside the vehicle. Acoustical Materials provides essential information on the basics of sound, vehicle noise source, how these are measured, how vehicle owners perceive sound, and ultimately, how to solve noise problems in vehicles using sound package materials.

Author: Society of Automotive Engineers. Wind Noise Measurement Committee
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 92

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Book Description

Author: Malcolm J. Crocker
Publisher: John Wiley & Sons
ISBN: 0471395994
Category : Technology & Engineering
Languages : en
Pages : 1594

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Book Description
Two of the most acclaimed reference works in the area of acoustics in recent years have been our Encyclopedia of Acoustics, 4 Volume set and the Handbook of Acoustics spin-off. These works, edited by Malcolm Crocker, positioned Wiley as a major player in the acoustics reference market. With our recently published revision of Beranek & Ver's Noise and Vibration Control Engineering, Wiley is a highly respected name in the acoustics business. Crocker's new handbook covers an area of great importance to engineers and designers. Noise and vibration control is one largest areas of application of the acoustics topics covered in the successful encyclopedia and handbook. It is also an area that has been under-published in recent years. Crocker has positioned this reference to cover the gamut of topics while focusing more on the applications to industrial needs. In this way the book will become the best single source of need-to-know information for the professional markets.

Author: Hans Jonasson
Publisher:
ISBN: 9789178487943
Category :
Languages : en
Pages : 74

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Book Description
The road vehicle as sound source has been studied within a wide frequency range. Well defined measurements have been carried out on moving and stationary vehicles. Measurement results have been checked against theoretical simulations. A Nordtest measurement method to obtain input data for prediction methods has been proposed and tested in four different countries. The effective sound source of a car has centre close to the nearest wheels. For trucks this centre seems to be closer to the centre of the car. The vehicle as sound source is directional both in the vertical and the horizontal plane. The difference between SEL and LpFmax during a pass-by varies with frequency. At low frequencies interference effects between correlated sources may be the problem. At high frequencies the directivity of tyre/road noise affects the result. The time when LpFmax is obtained varies with frequency. Thus traditional maximum measurements are not suitable for frequency band applications. The measurements support the fact that the tyre/road noise source is very low. Measurements on a stationary vehicle indicate that the engine source is also very low. Engine noise is screened by the body of the car. The ground attenuation, also at short distances, will be significant whenever we use low microphone positions and have some "soft" ground in between. Unless all measurements are restricted to propagation over "hard" surfaces only it is necessary to use rather high microphone positions. The Nordtest method proposed will yield a reproducibility standard deviation of 1-3 dB depending on frequency. High frequencies are more accurate. In order to get accurate results at low frequencies large numbers of vehicles are required. To determine the sound power level from pass-by measurement requires a proper source and propagation model. As these models may change it is recommended to measure and report both SEL and LpFmax normalized to a specified distance.

Author: James Mitchell Witkowski
Publisher:
ISBN:
Category : Noise pollution
Languages : en
Pages : 580

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Author: Richard D. Miech
Publisher:
ISBN:
Category : Noise
Languages : en
Pages : 8

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Book Description

Author: Yansong Wang
Publisher: Springer Nature
ISBN: 9811955794
Category : Technology & Engineering
Languages : en
Pages : 280

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Book Description
Sound quality research is an emerging field of acoustics, and it has broad application prospects in the field of vibration and noise control of machinery and automobiles. With the development of new energy vehicles in recent years, the technology demand for interior sound quality evaluation and control has increased rapidly. This book comprehensively introduces the basic concepts, theories, methods and the latest research progress in evaluating and controlling vehicle interior sound quality. The contents include the generation mechanism of the sound field in the vehicle, the evaluation index of the sound quality, the subjective and objective evaluation method, the neural network evaluation model, the data pre-processing, the active and passive control method, the vibration control method based on the piezoelectric effect, the hybrid vibro-acoustics active control method for interior sound quality and the system of sound quality evaluation and control, etc. It contains an introduction to basic knowledge and theoretical models and a detailed description of the research background, the algorithms implementation methods and the technical status of specific issues. By reading this book, readers can fully understand the current research status and development trend of vehicle interior sound quality evaluation and control and comprehend basic concepts, related theories and implementation methods.