This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A New Method for Engine Design Using Dynamic Optimization and Substructure Synthesis Method
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes a new method for engine design using dynamic optimization and substructure synthesis method. A very important theme in engine design is how to shift the peak of the natural frequency of the vibration mode that causes some noise and vibration problems. This must be resolved by effective modification of structural design.
In order to carry out effectively vibration analysis of a large scaled structure like engine assembly and conduct dynamic optimization with many iterative calculations, we have used substructure synthesis method that devides a whole structure into a number of substructures and solves each substructure.
Vibration analysis of engine assembly (cylinder block, crank shaft, bearing caps and flywheel systems) was carried out by using this substructure synthesis method. And, on the basis of the sensitivity of eigen value of the residual structure that is to be modified (cylinder block and bearing caps this time), the optimization program using Pseudo Least Square Method has been successfully applied to shift the peak of a given natural frequency to a designated frequency range.
Citation
Ishikawa, M., Iwahara, M., and Nagamatsu, A., "A New Method for Engine Design Using Dynamic Optimization and Substructure Synthesis Method," SAE Technical Paper 911065, 1991, https://doi.org/10.4271/911065.Also In
References
- Nagamatsu A. “Modal Analysis” 1985 Baifukan, Japan
- Ohkuma M. Sok-chu P. Nagamatsu A. Nanpei M. “A Technique of Structural Dynamic Modification (Use of Mathematical Pseudo Inverse Method and Substructure Synthesis Method)” 1989 ASME/JSME PVP Conference 179
- Iwahara M. Ohkuma M. Nagamatsu A. “Optimal Design Method for Dynamic Behavior of Structure” 1989 ASME/JSME PVP Conference 179
- Ishikawa M. Iwahara M. Nagamatsu A. “Dynamic Optimization Applied to Engine Structure” 1990 MSC World Users Conference 1