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NVH Optimization of a 16-Cylinder Diesel Engine
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English
Abstract
In the early design stage a 16-cylinder V-engine is optimized with respect to its vibrational and acoustic behavior. The objectives of the development are: (1) to minimize vibrations of the crankcase with special focus on the structure-borne noise transmission via the engine mounts, and (2) in this context, to identify the appropriate locations for the engine mounts.
The NVH behavior of the engine structure is simulated using the Finite Element Method (FEM). The dynamic FE-model of the engine is excited via synthesized cylinder pressure force spectra. The corresponding vibrations of the sound emitting surface are calculated, thereby revealing structural weaknesses. By calculation of the crankcase modal vibrations, the noise relevant modes are identified. Based on these results the influence of structural modifications on the NVH behavior is predicted.
As a result of this work, structural modifications were defined that will lead to a decrease in vibration level of 4 dB in the frequency range between 300 and 1500 Hz. As for the position of the mounts, it was found to be advantageous to move them as far as possible to the upper engine block.
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Citation
Czerny, L., Schwaderlapp, M., and Wagner, T., "NVH Optimization of a 16-Cylinder Diesel Engine," SAE Technical Paper 932492, 1993, https://doi.org/10.4271/932492.Also In
References
- Schmillen, K. 1991
- Wolschendorf, J. Schmillen, K. Dürnholz, M. The IDI Diesel Engine and its Combustion Noise Variations SAE 910228
- Schmillen, K. Schwaderlapp, M. Spessert, B. 1992 Stuttgart
- Kanda, H. Okubo, M. Yonezawa, T. Analysis of Noise Sources and Their Transfer Paths in Diesel Engines SAE 900014
- Steinmüller, G. Svoboda, M. Richter, I. 1992
- Salm, J. Zech, H. Czerny, L. Structural Dynamics of a High-Speed Diesel Engine Crankshaft Dynamic Stress Computation with Comparison to Measured Values CIMAC London 1993
- Rudert, W. Wolters, G.-M. 1991 Stuttgart
- Busch, G, Maurell, R. Meyer, J. Vorwerk, C. Investigations on Influence of Engine Block Design Features on Noise and Vibration SAE 911071
- Vorwerk, C. Busch, G. Kaiser, H.-J. Wilhelm, M. Influence of Bottom End Design on Noise and Vibration Behavior of 4-Cylinder In-Line Gasoline Engines SAE 931315
- 1985 Stuttgart
- Schmillen, K. Schwaderlapp, M. Wolschendorf, J. Primary Noise Reduction Measures on IDI Diesel Engines SAE 931309