This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Influence of Bottom End Design on Noise and Vibration Behavior of 4-Cylinder In-Line Gasoline Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 01, 1993 by SAE International in United States
Annotation ability available
The noise of passenger cars has to be further decreased according to customer and legislative requirements. Both, a lower sound level and a better sound quality are the aims to achieve a noise more accepted by the passengers. Taking into account the transmission of structure-borne and air-borne noise primary measures on the engine as the dominant noise excitation source of a motor vehicle are most promising and effective to solve these problems.
In the early design stage of an engine the fundamentals for an advantageous acoustical behavior have to be laid down. In this connection, the length of crankcase-skirts and the design in the main bearing area, i.e. the bottom end design, are important degrees of freedom concerning the acoustical optimization process of the engine block.
In this report the influence of different bottom end designs on the acoustical behavior of two high-performance spark-ignition engines -' one with short and one with deep skirt crankcase - is described. The two baseline engines - short and deep skirt with individual bearing caps - were modified with bearing beam, ladder frame, ladder frame girdle, bedplate and bearing cap cross-bolting. The investigations include analyses of the crankshaft dynamics and of the vibration transmission from the main bearings to the noise radiating surfaces of the engine. In addition, the vibration excitation at the powertrain mounts - input to the vehicle body - is assessed. For these analyses the different engine versions were investigated under fired conditions. Additional structural investigations were performed to gain knowledge of the dynamic behavior.
CitationVorwerk, C., Busch, G., Kaiser, H., and Wilhelm, M., "Influence of Bottom End Design on Noise and Vibration Behavior of 4-Cylinder In-Line Gasoline Engines," SAE Technical Paper 931315, 1993, https://doi.org/10.4271/931315.
- Schmillen K. : (Noise Analysis and Calculation Techniques for Automotive Engine Design; Course Notes) Vorlesungsumdruck RWTH Aachen 1989
- Brandl F.K. , Wünsche P. , Gschweitl E. : Design Strategies for Low Noise Engine Concepts SAE-Paper 911070 1991
- Challen B.J. , Croker D.M. : A Review of Recent Progress in Diesel Engine Noise Reduction SAE-Paper 820517 1982
- Anderton D. , Priede T. : Applications of Engine Noise Control Research Engine Noise Plenum Press New York - London 1982
- Ochiai K. , Yokota K. : Light-Weight, Quiet Automotive D.I. Diesel Engine Oriented Design Method SAE-Paper 820434 1982
- Teramoto T. , Deguchi H. , Shintani H. : Improvement in Vehicle Interior Sound Quality Newly Developed Power Plant Members
- Albright M.F. , Staffeld D.F. : Noise and Vibration Refinement of the Ford 3.8l Powertrain SAE-Paper 911073 1991
- McDonald A.M. , Hodgetts D. : The Transmission of Piston Forces to the Mounts of an Engine
- Busch G , Maurell R. , Meyer J. , Vorwerk, C. Investigations on Influence of Engine Block Design Features on Noise and Vibration SAE-Paper 911071 1991
- Spessert B. : (Investigation of the Acoustical Behavior of Crankcases and Cylinderblocks Taking into Account the Internal Vibration Transmission Path.) Aachen 1987
- Ogawa H , Hayashi Y , Hayakawa Y , Kubozuka T. : Engine Noise Reduction by Suppression of Vibration of Main Bearing Bulkheads and Caps Noise Control Engineering Journal January-February 1988
- Essers U , Gutzmer P , Kuipers G. : (Noise Excitation by Crankshaft Displacement in the Main Bearings of an S.I. engine) XX FISITA Congr.
- Priede T. , et al. : Experimental Techniques Leading to the Better Understanding of the Origins of Automotive Engine Noise
- Tsuge K. , Kanamara K. , Kido T. , Masuda N. : A Study of Noise in Vehicle Passenger Compartment During Acceleration SAE-Paper 850965 1985