A.R. Valiev, R.I. Ibyatov, F.F. Yarullin
Kazan State Agrarian University, ul. K. Marksa, 65, Kazan’, 420015, Russian Federation
Abstract. The purpose of this work was to study the energy indicators of a conical working tool in a soil channel and to justify the parameters of its working position by solving a multi-objective optimization problem. The main parameters of new rotary conical working tools for surface soil tillage are the angle of attack to the direction of motion (alpha) and the angle of inclination to the vertical axis (beta). This arrangement of the working tool ensures its rotation during operation and the sliding cutting of the soil by the cutting edge. It helps to reduce the draught resistance of equipment. When the working element rotates, the soil layer is cut into individual pieces by plate-shaped knives, then, rotating together with them, it rises to a certain height and, when it falls, it turns over, undergoing intensive crumbling. Experimental studies of the rotational conical working unit were carried out in the soil channel at the premises of the interdepartmental laboratory of Kazan State Agrarian University with the following values: angle of attack alpha was 20–50 degrees in increments of 15 degrees, angle of inclination to the vertical axis beta was 20–40 degrees in increments of 10 degrees, depth of tillage h was 0.08 cm, the translational velocity v was 3.3 m/s. As a response function, the traction force F1, the force in the vertical direction F2, the lateral force F3 and the rotation frequency of the rotational working tool ω were measured. Based on the results of the experimental studies, the dependencies characterizing the influence of the angles alpha and beta on the forces acting on the working tool in the longitudinal, vertical and lateral directions as well as on the frequency of its rotation during the operation were obtained. A technique is proposed for justifying the values of these angles, based on the solution of the multi-objective optimization task taking into account the weighting coefficient lambda(i) of each criterion. As a result of numerical calculations, it is established that if lambda 1 is 0.25, lambda 2 is 0.375 and lambda 3 is 0.375, the optimal angles are alpha = 47°, beta = 30°. If lambda 1 is 0.5, lambda 2 is 0.25 and lambda 3 is 0.25, the optimal angles are alpha = 46°, beta = 30°. If lambda 1 is 0.75, lambda 2 is 0.125 and lambda 3 is 0.125, the optimal angles are alpha = 45.5°, beta = 29.5°.
Keywords: soil cultivation, conical working tool, draught resistance, lateral force, rotational speed.
Author Details: A.R. Valiev, Cand. Sc. (Tech.), assoc. prof. (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); R.I. Ibyatov, D. Sc. (Tech.), prof. (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); F.F. Yarullin, Cand. Sc. (Tech.), assoc. prof. (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.).
For citation: Valiev A.R., Yarullin F.F. Justification of Parameters of the Conical Soil-Tilling Working Tool by the Solution of the Multi-Objective Problem of Optimization. Dostizheniya nauki i tekhniki APK. 2017. Vol. 31. No. 7. Pp.69-72 (in Russ.).