Modal analysis and acoustic noise characterization of a grain crusher
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University of Life Sciences in Lublin
Industrial Institute of Agricultural Engineering, Poznań, Poland
University of Technology, Lublin, Poland
Corresponding author
Wojciech Tanaś   

University of Life Sciences in Lublin, ul. Akademicka 13, 20-950 Lublin, Poland
Ann Agric Environ Med. 2018;25(3):433-436
Noise is one of the most important physical factors occurring in private farmers’ working environment. Hazardous noise exposures and hearing loss have been documented among farmers and farm workers for many years. In most cases, reducing the amplitude of vibratory motion of elements in a machine will reduce the noise generated by the machine element. The authors present the results on studies performed on a grain crusher with the aim of optimizing their acoustic behaviour.

Materials and method:
The dynamic behaviour of a grain crusher was investigated by identification of its natural frequency and damping parameters. The study was conducted using the experimental modal analysis technique. The excitation was generated at one single point by a vibration exciter, and the response signals were acquired by an accelerometers fixed at different points of the grain crusher. The modal parameters were determined from a set of frequency response measurements between a reference point and a number of measurement points of the structure.

The introduced structural modifications reduced the noise level by 3dB (A)5 dB[lin]) for the hopper component frequencies related to the vibration of the hopper (180 Hz) and the crusher support structure (240 to 480 Hz). The level of these components determines the level of noise at the operator’s work station for the average conditions of filling the hopper with grain. The total noise level at the crusher operator was reduced by 2.6 dB (A).

Reducing the amplitude of vibratory motion of the elements in a machine will reduce the noise generated by the machine element. The obtained results confirm that structural dynamic modification is an effective tool for changing the dynamical properties of vibrating systems.

DIRECTIVE 2006/42/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast).
Evans JP. Practical solutions to noise problems in agriculture. HSE Books; 2004.
Fu ZF, He J. Modal analysis. Butterworth-Heinemann; 2001.
Schwarz BJ, Richardson MH. Experimental modal analysis. CSI Reliability week, 1999; 35(1): 1–12.
Kromulski J, Pawlowski T, Zembrowski K. Identification of ods and dynamics characteristics of chain saws. Drewno. Prace Naukowe. Doniesienia. Komunikaty, 2010; 53(183).
Szczepaniak J, Tanas W, Kromulski J. Vibration energy absorption in the whole-body system of a tractor operator. Ann Agric Environ Med. 2014; 21(2).
Kromulski J. Metody badania odkształceń dynamicznych konstrukcji mechanicznych (ODS). J Res Applic Agric Engin. 2001; 46(3): 11–15.
Kromulski J. Nowoczesne metody pomiaru drgań mechanicznych maszyn rolniczych dla potrzeb weryfikacji ich modeli analitycznych. J Res Applic Agric Engin. 2001; 46(4): 32–35.
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