Resistance Reduction By Bionic Coupling Of The Earthworm Lubrication Function

The resistance and adhesion reducing of the terrain machines parts is a big technical problem that many experts are devoted in, no matter the machine is the carrying machines, military vehicles on the earth and the agricultural machine targeted the soil. The resistance and adhesion on the surface of the components with the soil has great influence on the efficiency, life span and working quality of the machine, especially the parts interacting with the dry and paddy field, beach, swamp, snow field, desert and so on. It increases the energy exhausting and makes the machine failed to run and work.There are many species in the biosphere, especially the soil livings which have the function of reducing the resistance and adhesion in the process of evolution. The earthworm is one of them. It can move smartly in the wet atmosphere, and not sticked by the soil. The body surface of the earthworm is good at reducing the resistance and adhesion. It is the result of smooth body surface, electroosmosis, flexibility, and lubrication. It is significant to research the resistance and adhesion reducing of the earthworm body surface. It is also promising in the resistance and adhesion reducing of terrain machines.Firstly, I observed and analyzed the surface of the earthworm, designed and made 10 sets of samples including the coupling dorsal pore, corrugation and the smooth sample. Based on the soil micro-adhesion test system, I made experiments to research the soil adhesive characteristics.From the single-factor experiments, it can be researched that the soil friction of the bionics samples increases with the pressure. The soil friction of the bionics samples decreases with the increase of the speed of the lubricants. The soil friction of the bionics samples increases as the advancing speed increases. The performance of the bionics samples is better than that of the samples with the coupling dorsal pore and corrugation. The sensitivity of the samples is higher than the usual ones, in which the bionics samples are the most obvious.Through the orthogonal experiments, I get the regression equation which indicates the relationship among the pressure, the advancing speed and the lubricating speed, as follows: y=1.1127+2.322×10-5z12-6.2344×10-3z1+0.00803z22-0.1446z2+0.00103z3From the regression equation, the positive pressure, the advancing speed and the lubricant flow rate of the bionics samples have great influence on the soil friction. The positive pressure and the lubricant flow rate have quadratic effect while the advancing speed is onetime effect. And there is no interaction. From the results of range analysis, the main and secondary factors affecting the soil sliding resistance were the positive pressure, the flow velocity and advancing velocity. The optimal integration was A1 B2 C1. That is, the soil sliding resistance of sample 6b was the smallest, when the positive pressure was 100 g, the lubricant flow rate was 9 ml/min and the advancing velocity was 240 mm/min.From the regression analysis and the results of the orthogonal experiments, we can see the positive pressure is the main factor affecting the soil friction. The second is the advancing speed and the lubricant flow rate. When the lubricant flow rate is constant, the sliding resistance increases with the positive pressure and the advancing speed. When the positive pressure is constant, the sliding resistance increases with the advancing speed, decreases with the increase of the lubricant flow rate. When the lubricant flow rate is constant, the sliding resistance decreases first and increases later; it increases with the positive pressure.