Detection of Structural Vibration-Induced Noises with Modal Analysis in Diesel Generators

Year 2019, Volume: 19 Issue: 1, 72 - 84, 01.01.2019

Uğur Ölmez Nevra Bayhan Hakan Doğan Murat Uysal

Abstract

Diesel generators are one of the most
common used energy sources for maintaining the continuity of electrical energy.
Diesel generators cause high noises during their operation. There are many
methods of eliminating the noise problems that diesel generators generate
during energy production. However, these methods show differences according to
the type of noise source. In this study, the problem of noise was emphasized
that it is caused by structural vibrations of diesel generators. Therefore, the
method of coherence function, which is an analytical method, was used for the
detection of noise caused by structural vibrations. A test software and user
interface was developed to perform sound and vibration measurement and analysis
with using coherence function. The coherence analysis of sound and vibration
data was made by performing various tests and measurements with the developed
test software. In the coherence tests of diesel generator, the vibration
frequencies that cause high noise at the measurement points were determined. In
order to verify the coherence tests, the computer-aided 3D solid model of
diesel generator used in the tests was created. Computer-aided modal analysis
of the diesel generator was performed by using this model. The modal analysis
was performed at the vibration measurement points and the frequencies that
cause high noise. Coherence test results and modal analysis results were
compared. It was seen that the results of the coherence measurement and the
results of the computer-aided modal analysis supported each other. As a result
of these studies, it was shown by computer-aided modal analysis that the high
noise occurring in diesel generators can be determined by the coherence tests. 

Cite this article as: Ölmez U, Bayhan N,
Doğan H, Uysal M. Detection of Structural Vibration-Induced Noises with Modal
Analysis in Diesel Generators. Electrica, 2019; 19(1): 72-84.

Keywords

Diesel generator, coherence, sound, vibration, modal analysis

References

• 1. K. B. Howell, “Fourier Series”, in Principles of Fourier Analysis, Boca Raton, USA: Chapman & Hall/CRC, 2001, ch. 2, pp. 93-242. [CrossRef] 2. J. W. Cooley, J. W. Tukey, “An algorithm for the machine calculation of complex fourier series”, Mathematics of Computation, vol. 19, no. 90, pp. 297-301, Apr, 1965. [CrossRef] 3. M. J. Crocker, J. F. Hamilton, “Modelling of diesel engine noise using coherence”, SAE Transactions, vol. 88, no 2, pp. 1263-1273, 1979. 4. M. J. Crocker, G. Anderkay, J. Y. Chung, “Controlling the noise radiated from diesel engines”, Proceeding of First Interagency Symposium on Transportation Noise Research, California, USA, 28-30 March 1973, pp. 631-647. 5. Q. Leclere, J. Doruet, E. Parizet, “Extraction and analysis of diesel engine combustion noise”, Proceedings of Exploratory Workshop on Modern Methods of Vibro-Acoustic Study with Application to Automative, Pitesti, Romania, 2011, pp. 37-43. 6. S. Narayan, “A review of diesel engine acoustics”, FME Transactions, vol. 42, no. 2, pp. 150-154, 2014. [CrossRef] 7. L. Lamula, K. Saine, K. Saarinen, J. Hyrynen, “Cylinder pressure generated noise of medium speed diesel engine”, Joint Baltic-Nordic Acoustics Meetings, Reykjavik, Iceland, 17-19 Aug, 2008. 8. K.W. Goff, “The application of correlation techniques to some acoustic measurements”, J Acoust Soc Am, vol. 27, no. 2, pp. 336-346, 1955. [CrossRef] 9. S. Kumar, N.S. Srivastava, “Investigation of noise due to structural vibrations using a cross-correlation technique”, J Acoust Soc Am, vol. 57, no. 4, pp. 769-772, 1975. [CrossRef] 10. T. Pazara, M. Pricop, I. C. Scurtu, C. Pricop, O. Radu, “Defect identification of moving parts of a mechanical installation using correlation between vibration and noise”, Scientific Bulletin of Naval Academy, vol. 19, no. 2, pp. 504-509, 2016. 11. J. Lukic, “An approach to an NVH investigation of vehicle hydrolic pumps”, Journal of Low Frequency Noise Vibration and Active Control, vol. 30, no. 2, pp. 137-147, 2011. [CrossRef] 12. P. J. Carrato, C. C. Fu, “Modal analysis techniques for torsional vibration of diesel crankshafts”, SAE Transactions, vol. 95, no. 4, pp. 955-963, 1986. [CrossRef] 13. J. Meng, Y. Liu, and R. Liu, “Finite element analysis of 4-cylinder diesel crankshaft”, IJIGSP, vol. 3, no. 5, pp. 22-29, 2011. [CrossRef] 14. F. J. Espadafor, J. B. Villanueva, M. T. Garcia, E. C. Trujillo, “Analysis of a diesel generator cylinder failure”, Engineering Failure Analysis, vol. 17, no. 4, pp. 913-925, 2010. [CrossRef] 15. S. Z. Jiang, W. B. Yan, “FEM modal analysis of diesel engine block”, Advanced Materials Research, vol. 971-973, pp. 481-484, 2014. [CrossRef] 16. P. B. Aher, S. K. Malave, “Vibration assessment of diesel engine genset mounts”, International Conference on Ideas, Impact and Innovation in Mechanical Engineering – ICIIIME 2017, Pune, India, 1-2 Jun, 2017, pp. 1700-1706. 17. S. Magdum, S. D. Yadav, “A finite element analysis of diesel engine test bed using different materials for reducing diesel engine bed vibrations”, IJCEA, vol. 12, special issue, pp. 1-8, 2018. 18. A. R. Kadam, S. B. Zope, “Analysis of diesel generator control panel using finite element method”, International Conference on Ideas, Impact and Innovation in Mechanical Engineering – ICIIIME 2017, Pure, India, 1-2 Jun, 2017, pp. 577-581. 19. U. Ölmez, H. Doğan, M. Uysal, “Noise analysis of diesel generators with coherence function”, Irditech 2018 International R&D, Innovation and Technology Management Congress, İstanbul, Turkey, 18 May, 2018, pp. 307-316. 20. T.C. Richards, “Dynamic testing of data acquisition channels using the multiple coherence function”, in Data Acquisition Applications, Z. Karakehayov, Ed, London, United Kingdom: Intech Open, 2012, ch. 3, pp. 51-78. 21. S. G. Kelly, “Free vibrations of SDOF systems”, in Mechanical Vibrations Theory and Applications, Si, SI ed., Stamford, USA: Cengage Learning, 2012, ch. 3, pp. 137-204. 22. Z. Q. Qu, “Theory of modal analysis,” in Modal Order Reduction Techniques with Applications in Finite Element Analysis, London, United Kingdom: Springer-Verlag, 2004, ch. 3, pp. 31-46. 23. U. Ölmez, “Sound and vibration analysis of diesel generators with coherence function”, M. S. thesis, Dept Electrical and Electronics Eng, İstanbul Univ, İstanbul, Turkey, 2018. 24. Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Pressure - Engineering Method in an Essentially Free Field over a Reflecting Plane, ISO 3744: 2010. 25. Reciprocating Internal Combustion Engine Driven Alternating Current Generating Sets - Part 10: Measurement of Airborne Noise by the Envoloping Surface Method, ISO 8528-10: 1998. 26. Mechanical Vibration - Evaluation of Machine Vibration by Measurements on Non-Rotating Parts - Part 1: General Guidelines, ISO 10816-1: 1995. 27. P. R. Donavan, D. M. Lodico, “Measuring tire-pavement noise at the source”, Petaluma, CA, USA, NCHRP Report 630, 2009. [CrossRef]
• Uğur Ölmez was born in Istanbul on September 3, 1989. He received his B.Sc degree in Electrical and Electronic Engineering from Pamukkale University in 2013. He completed his M.Sc. degree in Electrical and Electronics Engineering from Istanbul University in 2018. Currently, he is working as a Senior R&D Engineer in R&D Center of Teksan Generator. His research interests are electric power generation, renewable energy technologies, genetic algorithm and signal processing.
• Nevra Bayhan was born in Istanbul. She received her B.Sc. and M.Sc. degrees in Electrical and Electronics Engineering from Istanbul University in 1997 and 2001, respectively. She completed her Ph.D. in Control and Automation Engineering at Istanbul Technical University in 2008. Since 2011, she has been working at the Electrical and Electronics Engineering Department of Istanbul University as an Assistant Professor. Her research interests are automatic control systems, control systems design, robust control, time-delay systems, digital control systems, energy, low order controller design and control of systems with parameter uncertainties.
• Hakan Doğan was born in Istanbul on October 28, 1978. He received his associate’s degree in Electronics Department from Marmara University in 1998. He completed his B.Sc. degree in Mechanical Engineering at Ataturk University in 2002. Since 2014, he has been working at the R&D Center of Teksan Generator as a R&D Manager. His research interests are acoustic, vibration, CFD, FEM and energy.
• Murat Uysal was born in Izmir on April 25, 1983. He received his B.Sc. degree in Mechanical Engineering from Suleyman Demirel University in 2004. Currently, he is working at the R&D Center of Teksan Generator as a R&D chief. His research interests are passive type exhaust silencers, sound attenuated enclosures, FEM, vibration and airborne noise reduction techniques.