KISHIMOTO Tadashi Professor

ThemeDesing of farm tractor lug shape

My DreamTractor dynamics analysis on soft soil as farm field
Field Agricultural environmental engineering, Agricultural energy engineering, Agricultural machinery
Keyword Tractor, Agricultural tire, Radial tire, Traction, Motion resistance, Dynamic load, Lift resistance, Vertual hitch point, Load transfer, Tillage machinery


Motion analysis of agricultural tire lugs were conducted and obtained the characteristics of tire-lug interactions. Lug design equation for installing angel of a trailing lug side was obtained through the idea of the reduction of the motion resistance. Three-sided lug transducers and an axis type transdeucerwere newly designed and developed and clarified the characteristics of soil-lug interaction by experiments. Those transducers were also able to measure the lift resistance. Tire experiments with pressure sensors on leading and trailing lug side and three directional load cell on the lug face were conducted and obtained the relationships between lug components and the external forces under traction and braking conditions.

Slurry injector disk experiments showed that the thinner disk thickness and larger diameter can reduced the cutting resistance of the injector disk with a new disk tester.

Whole view of tire experimental device
Design of disk edge load cell for slurry injector with CAD

List of current research topics

  • Dynamic analysis of traction and braking conditions of agricultural vehicle
  • Design theories of agricultural tire lug
  • Analysis of soil compaction phenomena and its reduction through tire design
  • Application technology for animal effluent to field
  • Bio-diesel fuel production from inedible energy crop in tropical zone
Academic degree Ph.D.
License Driver's licence(middle size vehicle, special vehicle,trailer), Crane oeperation(less than 5 t), Slinging operation
Self introduction

I am from Fukuoka city in Kyushu. I have been conducting research on the field of "Terramechanics" as analyzing of the phenomena between soil and tractor or tillage machinery. Slurry injection machinery and the production of bio-diesel fuel are also

Room addressGeneral Research Building I
Room numberN2302-2
Mail address tksmt atmark


Research Department/Department of Agro-environmental Science/Division of Environmental and Agricultural Engineering/Section of Environmental and Agricultural Engineering
Affiliated academic society The Japanese Society of Veterinary Science, International Society of Terrain Vehicle Systems, American Society of Agricultural and Biological Engineers, Japanese Society of Farm Work Research, The Society of Agricultural Structures, Japan, The Asian Association for Agricultural Engineering
Academic background 1980 B.S, Department of agricultural engineering, Obihiro University of Agriculture and Veterinary Medicine
1981 Studying abroad, Department of agricultural Engineering, University of Peradeniya, Sri Lanka
1984 M.S., Obihiro University of Agriculture and Veterinary Medicine
1988 Withdrawal from graduate school, Kyushu University
1988 Assistant professor, Obihiro University of Agriculture and Veterinary Medicine
1991 Ph.D., Kyushu University
1994 Overseas research fellow by Ministry of ECSST
2000 Associate professor, Obihiro University of Agriculture and Veterinary Medicine
2004 Associate professor(concurrent), United Graduate School of Agricultural Science, Iwate University
2007 Name changing from "Jyokyoujyu" to "Jyunkyouju" by Ministry of ECSST
2014 Professor, Obihiro University of Agriculture and Veterinary Medicine
2014 Professor(concurrent), United Graduate School of Agricultural Science, Iwate University
2014- Present