### Abstract

Explosions of an internal combustion engine create powerful forces which cause the engine structure to vibrate. These vibrations are one of the sources of chassis excitation and interior noise emissions. Current research integrated signal processing with inverse technique to solve an inverse input problem for internal part of machinery. Such problem is consisted of sources that are both unknown and inaccessible. Inverse formulation is implemented to estimate unknown amount of vibration sources. Tikhonov regularization is carried out to stabilize solution of ill-posed problem. L-curve and generalized cross validation (GCV) methods are utilised to obtain the regularization parameter. In comparison with transfer path analysis, inverse technique does not need to separate the observation part from the system. The advantage of this solution over coherence based methods is its applicability in low frequency analysis of engine with missing inputs and outputs. Implementation of L-curve and GCV techniques below and after 600 Hz respectively reduces the error mainly below 20 dB throughout the spectrum in operational condition of a real engine.

Original language | English |
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Title of host publication | 17th International Congress on Sound and Vibration 2010, ICSV 2010 |

Pages | 1266-1273 |

Number of pages | 8 |

Volume | 2 |

Publication status | Published - 2010 |

Event | 17th International Congress on Sound and Vibration 2010, ICSV 2010 - Cairo Duration: 18 Jul 2010 → 22 Jul 2010 |

### Other

Other | 17th International Congress on Sound and Vibration 2010, ICSV 2010 |
---|---|

City | Cairo |

Period | 18/7/10 → 22/7/10 |

### Fingerprint

### ASJC Scopus subject areas

- Acoustics and Ultrasonics

### Cite this

*17th International Congress on Sound and Vibration 2010, ICSV 2010*(Vol. 2, pp. 1266-1273)

**Inverse analysis method for evaluation of combustion forces.** / Fouladi, Mohammad Hosseini; Mohd Nor, Mohd. Jailani; Mohd Ihsan, Ahmad Kamal Ariffin; Abdullah, Shahrir.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*17th International Congress on Sound and Vibration 2010, ICSV 2010.*vol. 2, pp. 1266-1273, 17th International Congress on Sound and Vibration 2010, ICSV 2010, Cairo, 18/7/10.

}

TY - GEN

T1 - Inverse analysis method for evaluation of combustion forces

AU - Fouladi, Mohammad Hosseini

AU - Mohd Nor, Mohd. Jailani

AU - Mohd Ihsan, Ahmad Kamal Ariffin

AU - Abdullah, Shahrir

PY - 2010

Y1 - 2010

N2 - Explosions of an internal combustion engine create powerful forces which cause the engine structure to vibrate. These vibrations are one of the sources of chassis excitation and interior noise emissions. Current research integrated signal processing with inverse technique to solve an inverse input problem for internal part of machinery. Such problem is consisted of sources that are both unknown and inaccessible. Inverse formulation is implemented to estimate unknown amount of vibration sources. Tikhonov regularization is carried out to stabilize solution of ill-posed problem. L-curve and generalized cross validation (GCV) methods are utilised to obtain the regularization parameter. In comparison with transfer path analysis, inverse technique does not need to separate the observation part from the system. The advantage of this solution over coherence based methods is its applicability in low frequency analysis of engine with missing inputs and outputs. Implementation of L-curve and GCV techniques below and after 600 Hz respectively reduces the error mainly below 20 dB throughout the spectrum in operational condition of a real engine.

AB - Explosions of an internal combustion engine create powerful forces which cause the engine structure to vibrate. These vibrations are one of the sources of chassis excitation and interior noise emissions. Current research integrated signal processing with inverse technique to solve an inverse input problem for internal part of machinery. Such problem is consisted of sources that are both unknown and inaccessible. Inverse formulation is implemented to estimate unknown amount of vibration sources. Tikhonov regularization is carried out to stabilize solution of ill-posed problem. L-curve and generalized cross validation (GCV) methods are utilised to obtain the regularization parameter. In comparison with transfer path analysis, inverse technique does not need to separate the observation part from the system. The advantage of this solution over coherence based methods is its applicability in low frequency analysis of engine with missing inputs and outputs. Implementation of L-curve and GCV techniques below and after 600 Hz respectively reduces the error mainly below 20 dB throughout the spectrum in operational condition of a real engine.

UR - http://www.scopus.com/inward/record.url?scp=84871457353&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84871457353&partnerID=8YFLogxK

M3 - Conference contribution

SN - 9781617822551

VL - 2

SP - 1266

EP - 1273

BT - 17th International Congress on Sound and Vibration 2010, ICSV 2010

ER -