Electronic Journal Technical Acoustics ISSN 1819-2408

M. Carfagni, R. Furferi, F. Miniati

Design and optimization of a new range of low sound emission generating set

language: English

received 18.02.2005, published 14.05.2005

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ABSTRACT

This work provides an integrated approach developed with the aim of reducing the noise of generating sets, and the results obtained. The methodology and the procedures employed, with the indications obtained from theoretical analysis, are extendable to a vast range of industrial machines. The approach described has been applied to some PRAMAC Lifter generating set, presenting a high value of sound power, in order to reduce it accordingly with the value provided by the recent normative. Two production series generating sets were examined. The first, named S 12000, is a petrol engine generating set, with a 10,8 KVA alternator power and 614 cm3 of cubic capacity; the second, named S 6000, is a diesel engine, with a 5,5 KVA alternator power and 406 cm3 of cubic capacity. The implementation of the method described in the paper concerns the design of a new frame for the two machines and the development of new acoustical muffler.

11 pages, 8 figures

Сitation: M. Carfagni, R. Furferi, F. Miniati. Design and optimization of a new range of low sound emission generating set. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2005, 13.

REFERENCES

1. L. L. Beranek, I. L. Vèr. Noise and vibration control engineering. Principles and applications. New York: John Wiley and Sons, 1992.
2. M. Cuesta, P. Cobo. Active control of the exhaust noise radiated by an enclosed generator. Applied Acoustics, 2000, 61, 83–94.
3. J. C. S. Lai, C. Speakman, H. M. Williamson. Control of shear cutting noise-effectiveness of enclosures. Applied Acoustics, 1999, 58, 69–84.
4. N. Tandon, B. C. Nakra, D. R. Ubhe, N. K. Killa. Noise Control of Engine Driven Portable Generator Set. Noise & Vibration Worldwide, December 1999, vol. 30, N°11, 15–24.
5. M. F. Russell. Automotive diesel engine noise and its control. SAE Transactions, 1973, 82, 937–954.
6. S. H. Jenkins. N. Lalor. E. C. Grover. Design aspects of low noise diesel engines. SAE Transactions, 1973, 82.
7. Crocker M. J., Kessler F. M. Noise and noise control, vol. 2. CRC Press, 1982.
8. Harris C. M. Handbook of acoustical measurement and noise control, 3rd ed. McGraw Hill Publishing Company, New York, 1991.
9. S.J. Elliott. Down with noise. IEEE Spectrum Magazine, 36(6), 1999, 54–61.
10. F. Miniati, M. Pierini. Norme tecniche e interventi progettuali per la determinazione del rumore e delle vibrazioni prodotte dalle macchine tessili. Rivista meccanica e macchine di qualità, 1999. Numero speciale su macchine tessili, Parte 1, Rumore.
11. ISO 9614-1:1993, Acoustics – Determination of sound power levels of noise sources using sound intensity – Part 1: Measurement at discrete points.
12. ISO 8528-10 (1998) Reciprocating internal combustion engine driven alternating generating sets – Part 1: Measurements at discrete points.
13. ISO 3744:1994, Acoustics – Determination of sound power levels of noise sources using sound pressure – Engineering method in an essentially free field over a reflecting plane.
14. M. L. Munjal, B. K. Behera, P. T. Thawani. Transfer Matrix Model for the Reverse-flow three-duct open end perforated element muffler. Applied Acoustics, 1998, vol. 54, N°3, 229–238.
15. M. L. Munjal. Acoustics of Ducts and Mufflers. John Wiley, New Deli, 1987.

		Monica Carfagni received the Master Degree in Mechanical Engineering at the University of Florence, Italy, in 1986. In 1990 he received a Ph.D Degree in Machine design and Construction from the University of Bologna, Italy. She is full Professor for the courses “Technical and industrial Design”, “Computational Graphics”, “Rapid Prototiping” and “Reverse Engineering” at the University of Florence, Italy. Starting from 2001 she is President and Chief Executive for the Industrial Engineering Bachelor and for the Textile Management Master Course of University of Florence. She is the author of 120 publications regarding mechanical engineering, environmental and industrial acoustics and vibrations, Image Processing, Rapid Prototiping, and Mechanical Design. Prof. Carfagni is a member of council for the MDA (Machine Design Association).
		Rocco Furferi was born in Florence, Italy, in 1974. He received the Master Degree in Mechanical Engineering at the University of Florence, Italy, in March 2001. In January 2002 he started the Ph.D. course in “Machine Design and Manufacturing” at the Department of Mechanical Engineering and Industrial Technologies” of the University of Florence. In March 2005 he received a Ph.D Degree in Machine design and Construction from the University of Florence. He is now lecturer and assistant Professor for the courses “Computational Graphics”, “Technical Computational Graphics”. He is Professor for the course “Environmental Image Processing”. His main interests (and publications) are: design of Image Processing based systems applied to textile field; development of methodologies based on the Artificial Neural Networks; design of quality control systems for textile processes, acoustical muffler design. Dr. Furferi is a member of MDA (Machine Design Association). e-mail: rocco.furferi(at)unifi.it
no photo		Fabio Miniati received the Master Degree in Environmental and Territorial Engineering at the University of Florence in 1997 and a Ph.D in Machine design and Construction in 2001. He is now lecturer and assistant Professor for the courses “Micro economy” and “Industrial Design” at the University of Florence. He is the author of 10 publications regarding environmental and industrial acoustics and vibrations. His principal scientific interest is that of machine design which aims to reduce the level of noise and vibrations emitted by machines.