Determining the Appropriate Values of Compactor Paramaters of the Enhanced Harrow Leveller

The following items are specified in the article: installation angle with regard of horizon of the enhanced compactor of harrow leveller for the purpose of increasing the work quality and efficiency in land areas harrowing and decreasing the energy-material consumption; length of the working surface and comparison to be forwarded to it, i.e., the results of multi-factor experiments to determine the optimal values of its vertical load corresponding to a coverage width of one meter, which provides the required level of work quality with low energy consumption. Multifactorial trials were implemented based on Hartley-4 plan. In this case the following items are obtained: mean square deviation of unevenness heights of processed land surface as evaluation criteria; degree of soil crumbling, i.e. amount of soil fractions having dimensions less than 25 mm; density of soil at 0-10 cm layer and comparative resistance of traction of the harrow leveller. The information and data obtained in the course of trials was developed based on the "Planexp" programme at the Experiments and Testing Department of the Institute. In this case the following criteria were used: Cochran's test criteria for evaluating the uniformity of dispersion; Student's criteria for evaluation the value of regression coefficients; Fisher criteria for evaluation the adequateness of regression models. The results of trial were developed based on the above specified programme, thus regression equations adequately formulating the evaluation criteria were obtained. They are the average square deviation of the height of the unevenness of the field surface treated for the unit operating speeds of 6.0-8.0 km/h which is less than 2.0 cm, the degree of soil compaction is greater than 80%, the density of the soil in the 0-10 cm layer is 1.1- In the range of 1.2 g/cm3 and the conditions under which the specific resistance of the harrow leveller has a minimum value, the following optimal values of the improved harrow-leveller compactor parameters were determined: installation angle of the compactor relative to the horizon 29-32 , working surface length 31-32 cm and the vertical load applied to it is 2.4-2.6 kN/m.