INMATEH - Agricultural Engineering

6

Authors: Bohatyrov D.V., Salo V.М., Kyslun О.А., Skrynnik I.O., Kisilov R.V.

The article presents a theoretical research on the influence of introducing height equal-area projection on the calculation accuracy of the air resistance power of the cylinder drum with blades. The effort was made to specify the resistance area depending on the angle setting and the number of blades of the crimper-roller. Research on the introduction of the equal-area projection of the height on the description accuracy of the crimper-roller air resistance power showed that the fractional error decreases by 1.5 times. This is explained by the absence of the uncertainty influence of the cylinder drum initial angle setting.

6

Authors: Bundza O.Z., Nalobina О.O., Nikitin V.G., Tkachuk O.L.

The article deals with the kinetics of the weeding process. The authors analyse the key figures to evaluate the effectiveness of machines for contact application; they also present the equation to calculate the final accuracy of the process.

6

Authors: Hevko B.M., Diachun A.Y., Dzyura V.O., Skyba O.P., Mel’nychuk S.L.

The new design of an installation for extracting sapropel is proposed. The theoretical background of sapropel extraction is developed. Based on the second order Lagrange equations and the standard program of numerical method Kunna-Tucker, the differential equation of bucket oscillation is derived. The graphic dependences of changing the angle of bucket deformation are developed as well as the linear horizontal and vertical deformation during unloading the bucket.

6

Authors: Sakhno V.P., Marchuk M.M., Marchuk R.M.

The long-haul truck movement along the curvilinear (in plan) trajectory is studied in this article. Braking the wheels of the bogie’s one side is proved to lead to the fact that the absolute instantaneous centre of the bogie turn, when coming into a corner and coming out of a corner, will be on different sides of the semi-trailer bogie axles. The side force of the bogie is directed towards the transfer centre of semi-trailer angular velocity when coming into a corner and, in the opposite direction, when coming out of a corner. Therefore, braking the wheels of one side frame of a bogie rear axle is considered more efficient.

6

Authors: Moise V., Tabǎrǎ I., Dudici C.L., Bǎnicǎ E., Rotaru Al., Boureci Gh. A., Stroe I.

The manipulation of cylindrical and spherical parts and blanks by using robots, to move them from a working place to another requires that the gripper fulfils certain conditions. This mechanism must be self-centring, to avoid the deterioration of the robots. In this paper, we made a synthesis of some self-centring grippers, by amplification with simple modular groups, usually RRR dyads. The grippers in the synthesis are considered to be with rigid fingers and with movable catching point.

8

Authors: Selvi K.Ç., Sağlam M, Dengiz O

In this study carried out in 2011 and 2012, the effects of four different tillage practices [plow + disc harrow + rotary tiller + direct seeding machine (TP1), chisel + disc harrow + rotary tiller + direct seeding machine (TP2), plow + rotary tiller + direct seeding machine (TP3), direct drilling (TP4)] and control plot without planting (TP5) on the soil bulk density (BD), moisture content and penetration resistance of a clayey textured soil were evaluated in the central Black Sea Region of Turkey with a geostatistical approach. The values of soil compaction indicators were significantly greater under the TP4 treatment than in the case of TP1 and TP2 after harvest, especially at 20-40 cm depth in 2011 and 2012. Overall, our results suggest the avoidance of direct seeding practices in high clay content soils.

8

Authors: Sarnavi H.J., Nikbakht A.M., Hasanpour A., Shahbazi F., Aste N., Adhikari R.S.

On-farm detailed electric load profile is becoming increasingly important in the context of renewable energy source implementation in livestock housing due to rising energy costs along with concerns over greenhouse gas emissions. This study aimed to propose and investigate a pragmatic methodology to determine detailed energy demand profile in dairy farm sizes of 20 to 100 cows as the most common size in Iran. A model was developed based on the case studied dairy farm conditions, including artificial lighting, milking, milk cooling and water pumping subsections. This research prepares the first step toward employing photovoltaic electricity in dairy farms and thereby encouraging sustainable dairy farming.

8

Authors: Tsurkan O.V., Gerasimov O.O., Polyevoda Y.A., Tverdokhlib I.V., Rimar T.I., Stanislavchuk O.V.

Drying coefficients depending on the main process parameters of fresh-peeled pumpkin seeds (FPPS) vibration and combined dehydration and relative drying coefficient on the basis of the constructed graphic dependence are defined. Dependences for calculation of moisture and time of FPPS dewatering in the studied change range of drying process parameters are displayed.

8

Authors: Niu P., Yang M.J., Chen J., Yang L., Xie S.Y., Chen X.B.

Exposure to severe vibration while tilling presents a serious health and safety risk to a handheld tiller operator. Handrail of the tiller transfers vibration from tiller to operator with an essential extent. Taking handrail of Shineray SR1Z-80 tiller as a case study, its vibration characteristics were investigated by means of Computational Modal Analysis and Experimental Modal Analysis, resulting in good agreement on natural frequency and mode shape within interested frequency range of the vibration, and the average relative error of natural frequency between them is less than 4%. Handle, rod and cross bar are main sections of the handrail that affect the vibration with decreasing level of influence regarding displacements. Structural optimization of the handrail was obtained by orthogonal factorial experiment design technique and statistical analysis of variance. The optimal dimensions of the handrail are handle length 170 mm, rod length 470 mm, and cross bar length 390 mm.

10

Authors: Liu X.C., Chen S., Wen L.Y.

The query system established through integer linear programming (ILP) model can rapidly respond to query operation in agrometeorological data query service. However, related existing studies have only discussed about known network layer information, extremely high time complexity exists under complicated large-scale environment, and query result cannot be acquired. Therefore, a distributed matching-based heuristic ILP query algorithm was proposed in this study for large-scale network and unknown status of network layer information to improve distributed data query capability. The lower bound of space–time cost of the query system was certified under unknown status of network layer information, under which circumstance ILP model and algorithm design were proposed formally. Finally, disjoint path allocation and node replication allocation methods were used to design universal query system algorithms when network layer information was known and unknown, respectively. Experimental results showed that the distributed matching-based query system algorithm proposed in this study could obtain optimal solution in large-scale agrometeorological network and was not restricted to fixed network topology. When the cost ratio of storage to a unit delay cost was 10, the query system cost would present a linear growth; when the ratio was greater than 30, the storage cost would rapidly decrease, but the delay cost increased and the algorithm would run fast. Accordingly, the proposed algorithm could flexibly realize effective balance between storage cost and query delay. Conclusions of this study can provide theoretical and technical references for data query in intelligent agrometeorological service cloud system.