Utilisation of inverse techniques for vibration source reconstruction

Mohammad Hosseini Fouladi, Mohd. Jailani Mohd Nor, Ahmad Kamal Ariffin Mohd Ihsan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Engine is one of the main sources of vehicle vibration. The major causes of engine vibration are combustion forces transmitted through pistons and connection rods. In order to attenuate this vibration, first step is to evaluate the sources. Assessment of these sources is not an easy task because the internal parts of machinery are not accessible. Instrumentation for such systems is more often costly, time consuming and some modifications should be made. In this paper, a method based on inverse techniques implemented and validated to estimate forces exciting a crankshaft. In the first part, the modal analysis outcomes utilised to reconstruct applied force for a single input system. It was shown that one response channel did not have enough modal information to reconstruct the excitation. Then more channels implemented along the object and reconstructed values overlapped the measurement results. Finally, a multiple input system investigated, special matrix conditioning and inverse techniques were implemented which improved results and validated the method. Responses together with Frequency Response Functions (FRFs) of crankshaft utilised in an inverse problem formulation. Tikhonov regularization used to solve the ill-conditioned inverse system. L-curve criterion employed to find the regularization parameter for the Tikhonov method. This research validated the strong ability of inverse techniques and may be used to estimate internal forces of machinery by response measurements in future.

Original languageEnglish
Title of host publication15th International Congress on Sound and Vibration 2008, ICSV 2008
Pages1664-1671
Number of pages8
Volume2
Publication statusPublished - 2008
Event15th International Congress on Sound and Vibration 2008, ICSV 2008 - Daejeon
Duration: 6 Jul 200810 Jul 2008

Other

Other15th International Congress on Sound and Vibration 2008, ICSV 2008
CityDaejeon
Period6/7/0810/7/08

Fingerprint

vibration
machinery
combustion vibration
engines
conditioning
estimates
pistons
frequency response
vehicles
rods
formulations
causes
curves
matrices
excitation

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

Cite this

Fouladi, M. H., Mohd Nor, M. J., & Mohd Ihsan, A. K. A. (2008). Utilisation of inverse techniques for vibration source reconstruction. In 15th International Congress on Sound and Vibration 2008, ICSV 2008 (Vol. 2, pp. 1664-1671)

Utilisation of inverse techniques for vibration source reconstruction. / Fouladi, Mohammad Hosseini; Mohd Nor, Mohd. Jailani; Mohd Ihsan, Ahmad Kamal Ariffin.

15th International Congress on Sound and Vibration 2008, ICSV 2008. Vol. 2 2008. p. 1664-1671.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fouladi, MH, Mohd Nor, MJ & Mohd Ihsan, AKA 2008, Utilisation of inverse techniques for vibration source reconstruction. in 15th International Congress on Sound and Vibration 2008, ICSV 2008. vol. 2, pp. 1664-1671, 15th International Congress on Sound and Vibration 2008, ICSV 2008, Daejeon, 6/7/08.
Fouladi MH, Mohd Nor MJ, Mohd Ihsan AKA. Utilisation of inverse techniques for vibration source reconstruction. In 15th International Congress on Sound and Vibration 2008, ICSV 2008. Vol. 2. 2008. p. 1664-1671
Fouladi, Mohammad Hosseini ; Mohd Nor, Mohd. Jailani ; Mohd Ihsan, Ahmad Kamal Ariffin. / Utilisation of inverse techniques for vibration source reconstruction. 15th International Congress on Sound and Vibration 2008, ICSV 2008. Vol. 2 2008. pp. 1664-1671
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