VIBRATION SOURCE ESTIMATION INSIDE OF MACHINERY | ||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||
| Article 17, Volume 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., May 2008, Pages 23-33 PDF (357.42 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/amme.2008.38993 | ||
| Authors | ||
| FOULADI M. H.1; NOR M.J. M.2; ARIFFIN A. K.2; ABDULLAD S.3 | ||
| 1PhD Candidate, Dep. of Mech. Eng, Faculty of Eng., Universiti Kebangsaan Malaysia. | ||
| 2Professor, Dep. of Mech. Eng, Faculty of Eng., Universiti Kebangsaan Malaysia. | ||
| 3Assoc. Professor, Dep. of Mech. Eng, Faculty of Eng., Universiti Kebangsaan Malaysia. | ||
| Abstract | ||
| ABSTRACT In this paper, signal processing is integrated with inverse techniques to solve inverse problem for internal parts of machinery in which, sources are unknown and inaccessible. Explosions of an internal combustion engine produce powerful pulses of energy which cause the engine vibration as a response. Attenuation of engine vibration is one of the important problems for NVH engineers. Engine vibration can affect the whole chassis vibration and interior noise level. Engine vibration is the dominant source of noise emissions (less than 200Hz) inside the vehicle compartment. In this research, inverse techniques are implemented to estimate unknown amount of vibration sources. Tikhonov regularization carried out to stabilize solution of ill-posed problem. L-curve method is also utilised to find the regularization parameter. In comparison with transfer path analysis, this method doesn’t need to separate the observation part from the system. Despite the coherence based methods, it is practical in low frequency analysis of engine with missing inputs and outputs. | ||
| Keywords | ||
| Vibration source estimation; Inaccessible sources; Inverse technique; Picard condition; L-curve; Tikhonov regularization | ||
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