This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Structure Borne Noise Prediction Techniques
Annotation ability available
Sector:
Language:
English
Abstract
The Noise Vibration Harshness (=NVH) behaviour of engines or power units is the one of the predominant factors for market acceptance of vehicles.
To reach this goal it is necessary to reduce the absolute noise level and also the noise level in specific frequency ranges. In diesel engines the predominant noise or vibrations are caused by combustion. This excitation is transferred via the crank train and bearings to the outer noise radiating engine surfaces. For gasoline engines this transfer path is also important. In such engines noise is created in the area of the main bearings by vibrations of the crankshaft.
In this paper a new prediction technique for the above mentioned vibration transfer problems which was developed at AVL during the last three years is described. The work was carried out in cooperation with AUDI AG and VW AG, West Germany.
This prediction technique is based on nonlinear Finite Element (FE) calculation methods and includes hydrodynamic calculation of the engine bearings. The results are obtained by a time history calculation of the response of the engine model due to the excitation forces of gas and inertia loads. After the comparison of the calculated results with experimental results from a test rig investigation, measurement and calculation were carried out to a 5-cyl. gasoline engine. During this investigation some remarkable results were obtained, leading to a better understanding of the vibration transfer from the rotating crankshaft to the engine surface.
Recommended Content
Authors
Topic
Citation
Priebsch, H., Affenzeller, J., and Kuipers, G., "Structure Borne Noise Prediction Techniques," SAE Technical Paper 900019, 1990, https://doi.org/10.4271/900019.Also In
References
- Fachbach, H.A. Thien, G.E. “Structure Vibration with Diesel Engines” MTZ 37 1976 7 8 269 274
- Affenzeller, J. Thien, G.E. Evaluating Engine Design for Low Noise Using Dynamic Structure Modeling SAE-Paper 82 820435 Detroit 1982
- Flotho, A. Spessert, B. Development Methods for Low Noise Diesel Engines SAE Paper 87 2249
- Anderton, D. Ghazy, M.R. Dynamic Response of Heavy Duty Diesel Engine Structure SAE Noise and Vibration Conference Traverse City, Michigan 1987
- Priede, T. Ghazy, M.R. Characteristics of Exciting Forces in Turbocharged Engines and its Effect on Engine Vibration and Noise Institute of Sound and Vibration Research of the University Southampton
- DeJong, R.G. Parsons, N.E. High Frequency Vibration Transmissions Through the Moving Parts of an Engine SAE-Paper 800405 1980
- Hayashi Yoshimasa Sugihara Kunihiko Toda Akira Ushijima Yuhi Analytical Study on Engine Vibration Transfer Characteristics Using Single-Shot Combustion SAE 81 810403 Detroit
- Ogawa Naoki Hayashi Yoshimasa Hayakawa Yoshikazu Kubozuka Takao Engine Noise Reduction by Suppression of Vibration of Main Bearing Bulkheads and Caps Noise Control Engineering Journal January-February 1988
- Leipold, F. Leis, H.-G. Dürr, W. “Natural Modes of V-Engine block for Light Duty Engines. Comparison of Holografic Measurements and FE-Calculations”
- Affenzeller, J. Priebsch, H.H. Rainer, G. “The Use of FEM for Noise Optimization of Engine Design” 1982
- Brandl, F.K. Thien, G.E. Eberl, G. Vibration Transmission in the Cranktrain and Structure of a Diesel Engine at Running Condition 5th Hungarian Seminar on Noise Control Szeged June 1986
- Brandl, F. Affenzeller, J. Thien, G. Some Strategies to Meet Future Noise Regulations for Truck Engines SAE-Paper 870950 1987
- Priebsch, H.H. Affenzeller, J. Kuipers, G. “Analyses to Reduce Noise Transfer in Diesel Engines” “Die Zukunft des Dieselmotors” “The Future of the Diesel Engine” Nov. 1988
- Essers, U. Gutzmer, P. Kuipers, G. “Noise Excitation by the Movement of the Crankshaft in the Main Bearings of a Gasoline Engine” 1984
- Tyrrell, R.J. Kirkup, S.M. Engine Noise - Practicalities and Prediction Part 3: Noise Prediction using the Boundary Element Method IMechE 1988
- Sun, J.C. Lalor, N. Richards, E.J. Power Flow and Energy Balance of Non-Conservatively Coupled Structures 1 Theory, Journal of Sound and Vibration 1987
- Lalor, N. Carr, I.E. The Prediction and Reduction of Noise from Engine Covers using Energy Methods IMechE 1988
- Lalor, N. Recent Structural Dynamics Techniques for Reducing Automotive Noise Second Intern. Conf. on Methodology and Innovations in Automotive Experimentation Florence, Italy Nov. 22-25 1988
- Baker, J.M. An Investigation into some Aspects of Crankshaft/Bearing Originated Noise in Petrol Engines Southampton 1981