Vibration and noise charecteristics of a brush cutter | |
| Author | Piyapong Wongkhunkeaw |
| Call Number | AIT Thesis no.AE-07-05 |
| Subject(s) | Vibration Noise. |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Agricultural & System Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis; no. AE-07-05 |
| Abstract | The vibration and noise characteristics of a Honda brush cutter model UMK 435 T were studied. Tests were conducted at 4000, 4500, 5000, 5500, 6000, 6500 and 7000 rpm for stationary condition and 5000, 5500, 6000, 6500 and 7000 rpm during operating condition. For the measurement of vibration, nine accelerometers were used at different location on brush cutter and on the operator's body. Accelerometers were assembled inside aluminum casing in such a manner that they were capable of sensing vibration signals in longitude, lateral and vertical modes at same time. The sound level of brush cutter was recorded by using microphone. Blood pressure and heart rate of the operators were also measured. Analysis on frequency-domain mode was employed in this study. The vibration signals from engine excitation showed that the dominant frequencies were engine frequencies and accelerations. Vibration characteristics in stationary condition were found to be complex. In general, it was observed that due to an increase in the engine speed of brush cutter, the intensity and the frequency of vibration were increased. At the same operating speed and operator, the intensity of vibration was the highest in the vertical mode and lowest in lateral mode. At the same operating speed and condition, the frequency of vibration was same for different operators. The vibration intensities when compared to the ISO standard 2631, were found to exceed the reduced comfort limit for 8 hours but the levels were below exposure limit during operation at almost all frequencies. The sound levels of the brush cutter were also compared to the international standards and were found to exceed the safe working level. The operator's blood pressure and heart rate were observed. The engine speed had no significant effect on the blood pressure and heart rate of the operator |
| Year | 2007 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AE-07-05 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Salokhe, Vilas M.; |
| Examination Committee(s) | Jayasuriya, Hemantha P.W.;Athapol Noomhorm;Canillas, Emmanuel C.; |
| Scholarship Donor(s) | RTG Fellowship.; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2007 |