Xiu Lun Wang

Characteristics of soil reactions of an open lugged wheel under paddy soil conditions

In the past, experimental studies on an open lugged wheel-soil interaction were conducted under predetermined constant slip and sinkage given mechanically. In practice, the soil reactions and motion of an open lugged wheel are determined by interaction between the soil-lug contact, and the soil under some load. For this study therefore, an experimental device giving freedom of movement in the vertical direction to a lugged wheel and self-propelled mechanism, was constructed. The slip and sinkage and soil reactions obtained in this experiment were considered to represent the actual phenomena of soil-lug interaction. Dynamic behaviour of the lugged wheel has already been reported [1]. Furthermore, the characteristics of soil reactions of the lugged wheel induced by lugs moving into the soil were measured and discussed.

Dynamic behaviour of an open lugged wheel under paddy soil conditions

Abstract Many experimental studies of open lugged wheel-soil interaction have been conducted, mainly based on the condition of constant slip and sinkage. As a result the reaction force to lugs seemed to be equal to the soil cutting resistance to a metal surface. However, analyses based on such methods do not appear to represent the actual behaviour of lugged wheel-soil interaction, especially when the lugs are spaced widely. The actual motion the wheel axle. In this study, an experimental device for a model lugged wheel was constructed to investigate the characteristics of the interaction between a lugged wheel and soil. Experiments were conducted under several test conditions of soil including paddy soil with a hard pan. The result of both theoretical and experimental data indicated that slip and sinkage of a lugged wheel showed a fluctuation with rotation angle of which the period is equal to the angular lug spacing. In each test soil condition used, the motion of the lugged wheel and the reaction forces acting on each lug from the soil for a free sinking wheel were different from that of the condition of constant slip and sinkage. It was found that the results obtained from this study could clarify the actual behaviour of lugged wheel-soil interaction.

Production of Biodegradable Board Using Corn Straw and its Mechanical Properties

In order to keep the sustainable developement of human life, renewable resources must be developed because of the limitation of fossil resources. Biomass as a renewable resource has been watched by all the world with interest. The purpose of this study is to utilize the biomass to produce biodegradable board. Corn straw was used to produce Bio-board with the process of refining, defibrating, forming and drying. The mechanical properties of the Bio-board were measured. Technical evaluation of the result shows that corn straw can be processed to produce Bio-board. The test for mechanical properties indicates that the rupture stress of Bio-board produced with the experimental conditions were 6.23MPa~16.95MPa and 8.6~23.5 times greater as compared with the polystyrene plastic used in food container. Therefore, the use of Bio-board as food packing container, heat insulation in architecture, mulch film in agriculture as a substitute for the chemical plastic materials is technically possible.