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Dynamic Simulation of Soil Cultivation using Particle Method

Article of Honda R&D Technical Review Vol.24 No.1

Summary

It is desirable for the rotors used in tillers to be shaped appropriately for the specific characteristics of soils in different regions. A technology for the prediction of the dynamic behavior of soils that makes it possible to study soils with varying characteristics on a computer is therefore demanded for the efficient design of tiller rotors.
However, soil cultivation is a dynamic phenomenon involving the deformation, breakage, and agitation of the soil, and it is challenging for methods that use grids, such as the finite element methods and finite volume methods generally used in conventional CAE technologies, to treat phenomena of this type. The research discussed in this paper therefore attempted to develop a simulator for three-dimensional fluid-structure analysis using the particle method, a method suited to the analysis of large-scale deformation and breaking phenomena. In conducting this development, analytical accuracy was increased by reproducing the boundaries between soil and rigid bodies using polygons. In addition, to make it possible to faithfully reproduce the break-up behavior of soil, a model of soil break-up conditions that considered the effect of soil consolidation was formulated, and measurements of soil properties were conducted in order to provide input conditions for the simulation.
Comparison of the results of simulations of a single tiller tine and an entire rotor with test results demonstrated that results matched for the break-up behavior of the soil and the shape of the plough pan. The simulator developed in the research discussed here has made it possible to reproduce soil cultivation on the desktop, and it is believed that it will be effective in helping to enable the efficient development of tillers.

Reference

(1) Yamamoto, Y., Sato, T. Anraku G.: Dynamic Simulation of Water and Soil Using the Particle Method, SAE paper, 2011-32-0563 (2011)
(2) Koshizuka, S.: Particle Methods (Computational dynamics lecture series), The Japan Society for Computational Engineering and Science, p. 1-139 (2005)
(3) Koshizuka, S.: Numerical Analysis of Flow using Particle Method, Flow 21, p. 230-239 (2002)
(4) Song, S. M., Koshizuka, S., Oka, Y.: Dynamic Analysis of Elastic Solids by MPS Method, Transactions of the Japan Society of Mechanical Engineers, Series A, Vol. 71, No. 701 (2005-1), p. 16-22 (2005)
(5) Tanaka, M., Masunaga, T., Nakagawa, Y.: Multi-resolution MPS method, Transactions of JSCES, Paper No. 20090001 (2009)
(6) Iida, K., Akimoto, H.: Water Slide Simulation using MPS Method, 17th Numerical Fluid Symposium D4-3 (2004)
(7) Harada, T., Koshizuka, S.: Wall Boundary Calculation Model using MPS Method, Transactions of JSCES, Paper No. 20080006 (2008)
(8) Murayama, S.: Dynamic Behavior of Soil, Gihodo Shuppan, p. 1-23, p. 119-221 (1990)
(9) Yamaguchi, H.: Soil Mechanics (All revisions), Gihodo Shuppan, p. 1-32, p. 91-106, p. 141-194 (1969)
(10) Tomita, Y.: Foundation and Application for Theory of Elasto-Plasticity, Morikita Publishing Co., Ltd., p. 25-64 (1995)
(11) JIS 1216: Method for unconfined compression test of soils, p. 1-5 (2009)
(12) JGS 0131: Test method for particle size distribution of soils, p. 23-33 (2008)

Author (organization or company)

Yosuke YAMAMOTO(Power Products R&D Center)、Takayuki SATO(Power Products R&D Center)、Genki ANRAKU(Power Products R&D Center)

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