Roughness of Paddy Field and Vibration of Rice Trnasplanter

Abstract

It is important to reduce the vibration of the leveler for good performance of rice transplanters. To obtain the relation of the paddy field roughness and vibration of the transplanter mounted on a hand-tractor, the power spectral analysis was applied. In this report the author assumed that low frepuency vibrations of the leveler depended on both the vibration of the hand-tractor and the roughness of tillage pan and paddy field surface, and these relations were linear. Results obtained from these analyses are summarized as follws;
(1) On the roughness of the tillage pan and the paddy field surface, The power spectral was close to the n th order function of frequency. Roughness of the tillage pan across the plowing direction had irregularity with plowing width. Roughness of the paddy field surface and the tillage pan was close to that of the concrete road and the row crop field along the row.
(2) Vibration of the rice transplanter was obtained by accelerometer. Low frequency vibrations of the handtractor mostly came from the lug of the paddy field wheel and this phenomenon was remarkable on carefully paddled fields. On the field having the large irregurality at the tillage pan, various kinds of vibrations were observed in addition to the vibration caused by wheel lugs. So it is important the leveler to sturdy the mounting method of without affecting the vibration of hand-tractor.
(3) The effect of paddy field roughness on the vibration of leveler with the rice transplanter was not clear because the vibration of the handtractor was large. But the power spectral of leveler was different with field roughness, so the tillage method to minimize roughness is necessary for the transplanting operation to follow.