INMATEH - Agricultural Engineering

8

Authors: Lutsiv I.V, Hevko I.B., Lyashuk O.L., Dubynyak T.S.

Elastic-conical SCl design for decreasing of impact loadings in half-couplings of screw conveyer safety clutches at the moment of their wearing is offered. Analytical dependence of impact loadings determination at direct and torque shocks in the investigated clutch with gap S of spring installation and certain safety clutch without gap is given. Graphic dependences of these relations on gap S and spring tension C and graphs of axial and rotational velocities dependences on impacts from inclination angle of nonworking limit β are shown.

8

Authors: Nourani A., Bencheikh A.

This work aims to determine the energy use for greenhouse vegetable production and to estimate the mechanization index in Biskra province (Algeria).The results revealed that the total energy required for vegetable protected production is 119.68 GJ per hectare where the infrastructure was the highest energy consumer followed by the electricity and fertilizers with a share of 22%, 20% and 19%, respectively. The energy use efficiency was calculated as 0.82, showing the inefficiency use of energy in the protected vegetable production. The entire farmers use least machinery labour energy in hectare compared to the human energy and the itinerary crop is similar for all greenhouses.

8

Authors: Zhonghua Ni

Water storage pit irrigation is a common irrigation method widely used in the northern part of China which can combine water-saving irrigation with soil and water conservation. Applying this method, this study analyzed different temperature and water content of the soil and established correlative models to study the water and nitrogen transport of soil in water storage pits. The results showed that the difference between the measured values of water and nitrogen obtained from the models and the actual values was small, either under different temperature or irrigation amount, suggesting that the models were correct.

10

Authors: Baranovsky V.M., Potapenko M.V.

Based on the theoretical analysis of root crops lifting process, the simulation models are shown describing the relation of the feed per second of root crops coming to the cleaners, or the change of the cleaner required throughput capacity depending on the vibrating lifter design parameters, agro-biological characteristics of chicory root crops and working conditions of root-gathering machine

10

Authors: Hevko R.B., Yazlyuk B.O., Liubin M.V., Tokarchuk O.A., Klendii O.M., Pankiv V.R.

The article presents a research technique on the process of simultaneous transporting and stirring of mixture components by a continuous-flow conveyor. Kinematic motion parameters of loose materials in the main characteristic route segments have been substantiated. Experimental studies have been conducted in order to determine the drag force in set route segments and the stirring rate of mixture components. The obtained results provide a mean of choosing cost-effective operating modes of a conveyor-mixer, whereby the specified quality of mixtures is achieved.

10

Authors: Zhipeng Li, Songzhuo Shi

Agricultural towing vehicles are driven under poor road conditions. The impact of rough road surface seriously affects the driving safety of agricultural towing vehicles. The mechanism of vibration of agricultural towing vehicles caused by rough roads is explored to reduce the adverse effects of road surface impact on the handling stability of agricultural towing vehicles and to improve the handling and steering stability of vehicles. First, the adverse effects of rough road input conditions on the handling stability of electric power steering (EPS) system were considered, and the kinetic model of the EPS system and the eight degree-of-freedom models of the whole vehicle were established. Second, tire and road surface impact models were introduced. Finally, the stability of the steering system under rough road input conditions was analyzed. Results show that the current following accuracy of the proposed motor control system is increased by 5%, and the final return-to-center residual angle of the steering wheel is 15 degrees. This study indicates that the vehicle vibration caused by road surface impact affects not only the driving stability of vehicles but also the smooth return of the steering system. The motor control system designed in this study effectively reduces the adverse effects of road surface impact on the steering system. The analysis and research process and the results are suitable for the investigation on the return-to-center performance of the EPS system for passenger and freight cars and the response of vehicle handling stability under different vibration sources.

10

Authors: Ji Hengying, Shao Ming-an, Jia Xiaoxu

Considering the serious soil and water losses that impede the development of agricultural production in Loess Plateau in China, this study investigated the soil water infiltration, runoff yield, and sediment yield through simulated rainfall using rainfall water of different qualities; additionally, this study investigated the influence of water quality on rainfall-induced erosion. The effects of rainfall water quality on soil erosion under artificial simulation were studied in the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau from 2015 to 2016. This experiment used four rainfall water types (water, natural precipitation, natural hydrops, and tap water) and three typical loess plateau soil samples (Loessal soil, Lou soil, and laminated Lou-Sand). The effect of water quality on soil erosion under the same rainfall intensity (60mm/H) and slope (5°) was determined. Results showed that the intensity of rainfall erosion was significantly affected by water quality, and soil erosion intensity gradually decreased with increased sodium adsorption ratio and conductivity (water