The method of hydrodynamic analogies in the system of model studies of soil-cultivating machines

Abstract

Borrowing in the process of creating soil-cultivating machines of bionic methods is a promising direction in the development of the agricultural machinery industry. The essence lies in the fact that the biological analogue of the working body is elected, a mathematical model of its interaction with the environment is created and, based on the results of calculations, a decision is made in accordance with the model on the concrete design of the implement. The problem is that almost all possible biological analogues are marine animals, that is, methods of hydrodynamic analogy can’t be avoided. The method of hydrodynamic analogies is considered as a kind of analog simulation. In contrast to the theoretical studies of V.S. Kazakova our the technique allows us to establish in the experiment the similarity criteria, extends the possibilities of the method. An essential advantage is the detailing of the components of the resistance to the level of the initial data. It is established that the coefficient of drag in hydrodynamics and the specific cohesion of soil particles have an identical essence and can be used to determine the similarity criteria. It is established that the concept of a cutting perimeter can be identified in hydrodynamics by the notion of the area of the wettable surface. In the article it is proposed to take as the similarity criteria the ratio of the corresponding components of the traction resistance equation AM Panchenko and the equation of the drag of a body moving in an aqueous medium. In the paper, the possibility of sharing the similarity criteria for analog and physical modeling is proved.