AN ADVANCED MEASUREMENT OF PADDY FIELD SURFACE ROUGHNESS BY STATIC LEVEL METHOD

Authors

  • Đỗ Minh Cường Trường Đại học Nông Lâm
  • zhu shi hong
  • Nguyễn Thị Ngọc
  • Farman Ali Chandio

Abstract

Determination of accurate paddy field surface profile has great importance to designing the paddy tractor suspension system. With this aim, a new test rig has been designed and developed to measure paddy field surface profiles using static level method (sampled interval of 200mm). The data were analyzed through Matlab/Simulink software to obtain power spectral densities (0.05-3.5c/m) of the measured profiles on a log-log scale and it was found that the amplitude variation of the power spectral density (PSD) at low spatial frequency was higher than at high spatial frequency whereas the undulation of the PSD curve was largely changed from low to high frequency with roughness coefficient of 645.06x10-6 m3/cycle and slope value of 1.2399  representing the paddy field surface roughness under class D of ISO 8608 standards. This classification has great significance in the field of tractor vibration simulation work.

Keywords: Paddy field surface, Rod and Level, Static level method, ISO 8608.

Author Biography

Đỗ Minh Cường, Trường Đại học Nông Lâm

Trường Đại học Nông Lâm

References

. Laib L., Measurement and mathematical analysis of agricultural terrain and road profiles, Journal of Terramechanics, Vol. 14, No. 2, (1977), 8397.

. Wendenborn J. G., The irregularities of farm roads and fields as sources of farm vehicle vibrations, Journal of Terramechanics, Vol. 2, No. 3, (1966), 940.

. OHMIYA K., Characteristics of farm field profiles as sources of tractor vibration. Journal of Terramechanics, Vol. 23, No. 1, (1986), 23-36.

. LAIB L., Analysis of the vibration-excitation effect caused by deformable soil surfaces, Journal of Terramechanics, Vol. 32, No. 2, (1995), 151-163.

. Lu Zhixiong, et al., Characterisation of soil profile roughness, Biosystems Engineering, Vol. 91, No. 3, (2005), 369-377.

. Sr Hency C. Hodges, et al., Method and Apparatus for determining terrain surface profile, Unites States Patent, United States, 1991.

. Arturo González, et al., The use of vehicle acceleration measurements to estimate road roughness, Vehicle System Dynamics, Vol. 46, No. 6, (2008), 483-499.

. ASTM, Standard Test Method for Measuring Road Roughness by Static Level Method, American Society for Testing and Materials, 1996.

. ISO-8608, Mechaical vibration - Road surface profiles - Reporting of measured data, 1995.

. Wong J. Y., Theory of Ground Vehicles - Thirdth edition, John Wiley & Sons Publications, New York, 2001.

Published

2013-10-03