Setembro 2017 vol. 4 num. 1 - XXV Simpósio Internacional de Engenharia Automotiva

Artigo Completo - Open Access.

Idioma principal | Segundo idioma

COMBUSTION INFLUENCE ON A BEARING KNOCK NOISE ISSUE FOR A DIESEL ENGINE

COMBUSTION INFLUENCE ON A BEARING KNOCK NOISE ISSUE FOR A DIESEL ENGINE

CAPANA, Giulliano Humberto ; PECULA, Mauro Miguel ; LEITE, Angelo Alves ;

Artigo Completo:

The impulsive noise can have several sources in internal combustion (IC) engines, such as geared pairs and nozzles and its own cyclical operation. It can cause a considerable annoyance, especially when modulated by minor orders, affecting the sound quality of the engine and consequently the image of the product to customers. IC engines have severe operating conditions, involving high temperatures and high pressures, with large variations in internal forces within each cycle. The bearings are particularly vulnerable to these conditions, because of the extreme variations in load. This paper approaches a diesel engine bearing knock noise issue noticed at low speeds and loads in a Brazilian Proconve 7 truck application. During the investigation process several root causes were raised as well as potential corrective actions. It was detected that the main source of the noise was coming from one of the main bearings and that combustion plays a significant role over the noise. Although mechanical measures are also considered on this study special focus is given to combustion as calibration solution represents lower costs when comparing to design changes. The outputs obtained from sweeps and DoE methodologies performed especially for combustion parameters revealed that splitting injection is one of the best approach for reducing the noise. Another solution proven to be effective is the 6 th cylinder injector shut off during idling and low load operation. Both calibration options dramatically reduced noise but, besides fulfilling emissions legislation, splitting injection resulted in white smoke emission at cold temperatures so that injector shut off has been implemented as the solution for massive production. Throughout a dataset update via electronic control unit (ECU) flash, such solution has been implemented in several trucks in the field and it has been proven to be effective in solving bearing knock noise complaint.

Artigo Completo:

The impulsive noise can have several sources in internal combustion (IC) engines, such as geared pairs and nozzles and its own cyclical operation. It can cause a considerable annoyance, especially when modulated by minor orders, affecting the sound quality of the engine and consequently the image of the product to customers. IC engines have severe operating conditions, involving high temperatures and high pressures, with large variations in internal forces within each cycle. The bearings are particularly vulnerable to these conditions, because of the extreme variations in load. This paper approaches a diesel engine bearing knock noise issue noticed at low speeds and loads in a Brazilian Proconve 7 truck application. During the investigation process several root causes were raised as well as potential corrective actions. It was detected that the main source of the noise was coming from one of the main bearings and that combustion plays a significant role over the noise. Although mechanical measures are also considered on this study special focus is given to combustion as calibration solution represents lower costs when comparing to design changes. The outputs obtained from sweeps and DoE methodologies performed especially for combustion parameters revealed that splitting injection is one of the best approach for reducing the noise. Another solution proven to be effective is the 6 th cylinder injector shut off during idling and low load operation. Both calibration options dramatically reduced noise but, besides fulfilling emissions legislation, splitting injection resulted in white smoke emission at cold temperatures so that injector shut off has been implemented as the solution for massive production. Throughout a dataset update via electronic control unit (ECU) flash, such solution has been implemented in several trucks in the field and it has been proven to be effective in solving bearing knock noise complaint.

Download (PDF)

Palavras-chave: diesel engine,

Palavras-chave:

DOI: 10.5151/engpro-simea2017-50

Referências bibliográficas
  • [1] FEV website – Impulsive noise on diesel engines.
  • [2] S. G. Dogan - Loose part vibration in vehicle transmissions - Gear rattle, University of Stuttgart – Germany.
  • [3] Ö. Kilicay - Predicting impact conditions due to Bearing clearances in linkage mechanisms - Doctor of Philosophy in the Faculty of Engineering of the University of London.
  • [4] J. N. Chi - Non-Invasive Diagnostics of Excessive Bearing Clearance in Reciprocating Machinery - B.E.Sc., The University of Western Ontario, Canada (1993).
  • [5] Z. Stanik, J. Warczek, - Application of Vibration Signals in The Diagnosis of Combustion Engines – Exploitation Practices - Journal of KONES Powertrain and Transport, Vol. 18, No. 3 2011.
  • [6] O. Sauvagea, A. Lauracb, M.-C. Bezata, V. Roussariea and P. Guillemainc - Diesel knock noise from combustion phenomenon to perceived signals - Proceedings of the Acoustics 2012 Nantes Conference.
  • [7] J. Chen, R. Randall - Vibration Signal Processing of Piston Slap and Bearing Knock in IC Engines - School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney – Australia.
  • [8] J. Chen, R. Randall - Intelligent diagnosis of bearing knock faults in internal combustion engines using vibration simulation, Institute of Sound and Vibration Research, University of Southampton, Southampton, UK - School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney – Australia.
  • [9] YAN, J., ROGALLA, R., & KRAMER, T., “Diesel Combustion and Transient Emissions Optimization Using Taguchi Methods”, SAE Technical Paper Series, 930600, 1993.
  • [10] LEAL, S., LUZ, F., & CAPANA, G., “Fuel Consumption Optimization in a MD Diesel Engine Using Analytical Tools”, SAE Technical Paper Series, 2015-36-0321. BIBLIOGRAPHY:
  • [11] Valkonen, Antti - Oil Film Pressure in Hydrodynamic Journal Bearings, Helsinki University of Technology, Doctoral Tesis.
  • [12] Salamone, Dana J. – Journal bearing design types and their applications to turbomachinery, Centritech Corporation, Houston Texas.
  • [13] Internal combustion engine Handbook – Basics, components, systems and perspectiver – SAE International - Chapter 7.19 – 2002 edition.
  • [14] Georges, S. N. Y., Ruídos e vibrações veiculares – 2005 edition
Como citar:

CAPANA, Giulliano Humberto; PECULA, Mauro Miguel; LEITE, Angelo Alves; "COMBUSTION INFLUENCE ON A BEARING KNOCK NOISE ISSUE FOR A DIESEL ENGINE", p. 660-678 . In: . São Paulo: Blucher, 2017.
ISSN 2357-7592, DOI 10.5151/engpro-simea2017-50

últimos 30 dias | último ano | desde a publicação


downloads


visualizações


indexações