Abstract
Piston slap induced noise may contribute significantly to the noise emitted from Internal Combustion engines in a specific frequency range.
There is a high interest to simulate this phenomenon in the development process of both, Diesel and gasoline engines in order to analyse measures for reducing this noise source in an early development stage of the engine. Piston slap is mainly affected by various design
parameters of piston and liner, by the temperature distribution and by the combustion timing.
The paper summarises a methodology for predicting the piston to liner contact in running engines by means of MBD (Multi-Body Dynamics) and FEM. The advantages of this methodology are precise contact modelling on one hand and freedom in the model application on the other. Thus, trends caused by changes in the piston design and of combustion parameters on the contact impact can be analysed by simulation. Contact
statistics e.g. peak contact pressures and their locations, etc. help to assess the importance of the contact events.
In addition to the mathematical modelling of the excitation the paper
describes the transfer mechanisms of the piston slap phenomenon. Thus,
the model is extended in order to analyse vibration transfer via engine
structure. Results of simulation work show structure surface velocity
levels and their contribution to integral levels in different frequency
bands.
There is a high interest to simulate this phenomenon in the development process of both, Diesel and gasoline engines in order to analyse measures for reducing this noise source in an early development stage of the engine. Piston slap is mainly affected by various design
parameters of piston and liner, by the temperature distribution and by the combustion timing.
The paper summarises a methodology for predicting the piston to liner contact in running engines by means of MBD (Multi-Body Dynamics) and FEM. The advantages of this methodology are precise contact modelling on one hand and freedom in the model application on the other. Thus, trends caused by changes in the piston design and of combustion parameters on the contact impact can be analysed by simulation. Contact
statistics e.g. peak contact pressures and their locations, etc. help to assess the importance of the contact events.
In addition to the mathematical modelling of the excitation the paper
describes the transfer mechanisms of the piston slap phenomenon. Thus,
the model is extended in order to analyse vibration transfer via engine
structure. Results of simulation work show structure surface velocity
levels and their contribution to integral levels in different frequency
bands.
Originalsprache | englisch |
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Titel | Multi-body dynamics : monitoring and simulation techniques |
Untertitel | ... papers accepted for the second International Symposium on Multi-Body Dynamics: Monitoring and Simulation Techniques (MBD-MST 2000) |
Erscheinungsort | London |
Herausgeber (Verlag) | Professional Engineering Publ. |
Seitenumfang | 17 |
ISBN (Print) | 1860582583 |
Publikationsstatus | Veröffentlicht - 2000 |
Veranstaltung | 2nd Triennal International Symposium on Multi-Body Dynamics: Monitoring and Simulation Techniques - Bradford, Großbritannien / Vereinigtes Königreich Dauer: 27 Juni 2000 → 28 Juni 2000 |
Konferenz
Konferenz | 2nd Triennal International Symposium on Multi-Body Dynamics |
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Kurztitel | MBD-MST 2000 |
Land/Gebiet | Großbritannien / Vereinigtes Königreich |
Ort | Bradford |
Zeitraum | 27/06/00 → 28/06/00 |
Treatment code (Nähere Zuordnung)
- Theoretical
- Experimental