Design and noise, vibration, harshness analysis of engine. Here in this paper the vibration analysis is also done known as direct frequency response analysis. Bhon010 vehicle refinement controlling noise and vibration in road vehicles written for engineering practitioners and engineering students, this book will help readers to understand and develop quieter, more comfortable cars. Vibration motion sensed by the body mainly in the 0. Nvh refinement is an important aspect of powertrain development and the vehicle integration process, being often critical to satisfy customer expectations. High standards of noise, vibration and harshness nvh performance are expected in vehicle design. Noise, vibration and harshness nvh have become increasingly important factors in vehicle design as a result of the quest for increased refinement. Refinement is one of the main engineering and design attributes addressed in the course of developing new vehicle models and vehicle.
Expandable foam injected between panels, such as the dashboard and firewall, helps to add stiffness and vibration absorption. Vehicle refinement controlling noise and vibration in road vehicles by matthew harrison. Good communication, a cooperative relationship and trust must be established between nvh engineers, design and development engineers, suppliers, experimental planning, cae engineers, test technicians, program and engineering managers for the vehicle development process in order for the whole vehicle engineering team to. A model for the statistical distribution of road vehicle. Bureau of mines, in conjunction with carter mining co. Ijvnv aims to focus on noise and vibration in automotive engineering, both analytical and experimental. M 1996 the levels of sound energy and structural excitation inside the vehicle compartment measures the amount of annoyance in terms of quality and comfort. Current framework of vehicle noise regulation in japan. Although active control has been experimentally demonstrated in vehicles for over 20 years, it is only recently that the levels of integration within the vehicles electronic systems have allowed the cost to become affordable. Controlling noise and vibration in road vehicles available in paperback.
Cdc mining vibration testing of offroad vehicle seats. With an overdrive account, you can save your favorite libraries for ataglance information about availability. Controlling noise and vibration in road vehicles, matthew harrison. The scope of the book is wide, covering all the main sources of noise and vibration in road vehicles.
Active control works by destructive interference between the original sound or vibration field in the vehicle and that generated by a controllable, secondary, source. Sae international releases new book on vehicle vibration. Particular attention should be paid to the nvh performance of the vehicles. Test route from forest to the kilmallie sawmill at corpach, fort william. Vibration signals xt, being an effect of a force excitation, obtained by working process of engine, were recorded. For vehicle interior noise identification and treatment, quantification of noise sources by. Vibration data is acquired by a transducer connected to the portable test unit ptu. Natural frequencies of each model are found in first step. Random vibrations are typically vibrations caused by the vehicle driving over bumps, pot holes or rough road surfaces. Controlling noise and vibration in road vehicles r364 harrison, matthew on. International journal of vehicle noise and vibration. The dynamic behaviour of off road vehicles is becoming increasingly important as vehicles are required to operate at faster speeds, carry greater loads and also be more reliable and comfortable to ride.
We unconsciously utilize all sensory information to evaluate sounds. High standards of nvh noise, vibration and harshness performance are expected by consumers of all modern cars. The first, practical aspect was used toward structuring of the acquired knowledge and relationships, required for proper problem diagnosis. All these analysis have been carried out in hyperworks. A case study on road noise source identification and. The paper proposes a single mathematical model that can accurately describe the statistical character of the random vibrations generated by road vehicles in general. Measurement, signal analysis, signal processing and noise reduction measures is a comprehensive reference for designers of gearing systems and test engineers in the automotive industry and is also a useful source of information for graduate students in automotive and noise engineering. Rationale and history of vehicle noise and vibration refinement. By matthew harrison written for engineering practitioners and. Vehicle noise and vibration refinement 1st edition. It enables to consider only the vibration generated by vehicle mechanism without vibration from road roughness during the drive. Road vehicles test devices for target vehicles, vulnerable road users and other objects, for assessment of active safety functions part 3.
Vibration transmission from road surface features vehicle. Noise and vibration also originates from outside the vehicle, interacting with the vehicle structure and then producing radiated sound inside the driver compartment harrison, 2004. I, daniel thomas ainalis, declare that the phd thesis entitled estimating the dynamic characteristics of road vehicles using vibration response data is no more than 100,000 words in length including quotes and exclusive of tables. In response to the inquiry of june 2005, the expert committee on motor vehicle noise, established under the noise and vibration committee of the central environment council, has been considering the future policy for motor vehicle noise reduction, including the measures for reduction of the inuse vehicle noise. Latest automobile client calls for excessive criteria of nvh noise, vibration and harshness functionality. Vibration has always been an important issue closely related to reliability and quality, while noise is of increasing importance to vehicle users and environmentalists. Vehicle noise and vibration refinement with special emphasis on diagnostics this paper presents certain considerations related to noise, vibration and harshness issues on modern motor vehicles. The first book devoted to the refinement of noise and vibration in automobiles. International journal of vehicle noise and vibration from inderscience publishers covers analytical and experimental noise and vibration in passenger vehicles, including off road recreational vehicles. This is a valid sensing method for vibration analysis if certain precautions are taken, namely calibration and frequency analysis. The vibrations in the vehicle structure were excited by engine working on idle gear.
Multimodal effects have to be explored to comprehend sound. Principally associated with road surface excitation. Engineers, technologists, researchers, scientists, specialists, managers in the automotive industry, as well as academicians working in university research including. Characterized by frequency, level and direction harshness rough, grating or discordant sensations associated with the combined effect of noise and vibration. Sealant is applied to close gaps in order to increase the transmission loss from the engine, wind, and road noise sources to the vehicle interior. These driving conditions can cause loose or improperly mounted components to. Regarding the nvh behaviour of the more electric vehicles. Vehicle refinement controlling noise and vibration in. Vehicle noise and vibration refinement is a process requiring team effort. A case study on road noise source identification and reduction measures in a compact suv 2017011863 road noise and speech intelligibility are becoming ever more important, irrespective of the vehicle size, due to vehicle refinement as well as connectivity with mobile communication equipment. Vehicle interior noise combination of sound, vibration. Krylov and others published matthew harrison, vehicle refinement.
Rationale and history of vehicle noise and vibration. The national organisation transport scotland will collaborate for the part of the haulage route on the a82 national road. A sophisticated sensor and data acquisition system was fitted to a nissan infiniti q56 sports utility vehicle, supported by simultaneous video and can data recording. Controlling noise and vibration in road vehicles by matthew harrison. It also provides an introduction to both acoustics and dynamics so that a wider readership can gain an appreciation of the physical processes that cause, propagate and control noise and vibration.
Mar 12, 2010 high standards of noise, vibration and harshness nvh performance are expected in vehicle design. Vehicle refinement controlling noise and vibration in road vehicles. International journal of vehicle noise and vibration ijvnv. The dynamics of several off road vehicles have been investigated using ibms continuous system. The purpose of the tests was to determine which seat provided the best vibration attenuation under laboratory conditions. Recent applications of viscoelastic damping for noise control in. Refinement is among the major engineering and layout attributes addressed during constructing new motor vehicle versions and car elements. The development of powerful processors at an affordable cost and the.
Random vibration of a road vehicle in this study, considering four different car models, random vibration characteristics of a road vehicle are investigated by using mathematica. Simplified binaural measurement systems for interior noise. Refinement is therefore one of the main engineeringdesign attributes to be addressed when developing new vehicle models and components. Vehicle refinement by matthew harrison overdrive rakuten. Evaluation of seat vibration sources in driving condition using. Vehicle vibration measurement and analysis sciencedirect. This report describes an experimental study of vehicle vibration response from road surface features, in particular the vibration response from a wide variety of rumble strips. Good communication, a cooperative relationship and trust must be established between nvh engineers, design and development engineers, suppliers, experimental planning, cae engineers, test technicians, program and engineering managers for the vehicle development process in order for the whole. Estimating the dynamic characteristics of road vehicles. It covers passenger vehicles, including offroadrecreational vehicles.
Physical limitations generally confine its usefulness to low frequencies and so that it complements conventional passive control methods. Dec 01, 2011 worn or damaged mounts can also allow the engine, transmission, or exhaust components to come in contact with the frame or body of the vehicle causing a vibration and noise. Noise and vibration also originates from outside the vehicle, interacting with the vehicle structure and then producing radiated sound inside the driver. Humans can directly detect vehicle noise, loudness and vibration smoothness by listening and feeling before any electronic instruments are connected. Refinement is one of the main engineering and design attributes to be addressed in the course of developing new vehicle models and vehicle components.
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