1,720,980 research outputs found
Modeling techniques for the control of thermal exchanges in mixed continuous-discontinuous flow food plants.
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Innovazione nelle linee di per il packaging secondario.
No full textL’utilizzo dell’aria compressa nelle linee di packaging per i prodotti alimentari consente di ottenere macchinari con elevate prestazioni e basso tasso di danneggiamento dei prodotti manipolati. In questo articolo, focalizzato sulle linee
per il packaging secondario, sono presentati i principali dispositivi pneumatici usati in questi tipi di macchine e le moderne tecniche di progettazione assistita per l’ottimizzazione delle prestazioni degli impianti
Preliminary Analysis Of Interaction Among Gears, Tines And Soil In A Rotary Harrow
Full text linkThis study concerns the preliminary analysis of a rotary harrow. It is analysed both from a kinematic and a structural point of view. The analysis focuses particularly on the force exchanged between the tine and the soil, drawing on scientific literature relating to the subject. Based on this force, a structural analysis is therefore carried out on the harrow tine and there is an analysis of the forces acting on the rotors connected to the tines. By creating parametric spreadsheets, it aims to outline a future method of study which will enable various geometries of harrows to be analysed quickly under different work conditions. The preliminary results obtained are satisfactory with reference to the resistance tests of the elements analysed and useful for the future study of the implement. © 2019, International Journal of Mechanics and Control, All Rights Reserv
Connubio di tecnologie nella macchina automatica per l'innesto erbaceo
No full textIl Politecnico e l'Università di Torino (Dipartimento di Scienze Agrarie Forestali e Alimentari) hanno lavorato in sinergia per lo sviluppo di una macchina automatica per l'innesto erbaceo del pomodoro. Considerata la specificità e l'importanza per l'agricoltura nazionale, la macchina è stata progettata per la pianta di pomodoro, ferma restando la possibilità, attraverso una semplice riconfigurazione, dell'utilizzo della macchina su altre coltur
Meccanismi di presa per la raccolta robotizzata di frutti e ortaggi
No full textPrincipi di funzionamento di veicoli robotizzati e stato dell'arte dei dispositivi per la raccolta selettiva di prodotti agricoli dotati di peduncol
Performance analysis of a tractor - power harrow system under different working conditions
Full text linkTillage is one of the most important operations in the preparation of land for growing crops. Among secondary tillage implements, power harrows, which have a series of PTO-driven rotors which rotate about their vertical axis, are widely adopted in soil-working operations. Typically, this kind of implement is highly energy consuming, due to the heavy mechanical loads required to pull the harrow and the PTO (Power Take-Off) torque needed to drive the rotors. This paper reports the results of extensive in-field experimentation in which the relationship between the operating conditions of a tractor - power harrow system and the mechanical loads (i.e. PTO torque and draught) were investigated in two different test site fields. The test parameters consisted of: nominal tractor speed (3, 6, 9 and 12 km h−1), nominal working depth (6, 9 and 15 cm) and rotor speed (285 and 411 rpm) at a PTO speed of 1000 rpm. The data was statistically analysed by means of a linear mixed effect model to assess the differences in the tractor - harrow system performances measured under different working conditions. The presented results show which operating conditions can be favourable regarding energy and fuel consumption as this information may be very useful to farmers to reduce costs. Moreover, the measured mechanical loads concerning PTO torque and draught may also be beneficial for manufacturers to improve the design of these kinds of implements
UAV-spray application in vineyards: Flight modes and spray system adjustment effects on canopy deposit, coverage, and off-target losses
Full text linkImprovements in the spray application of plant protection products enhance agricultural sustainability by reducing environmental contamination, but by increasing food quality and human safety. Currently, Unmanned Aerial Vehicles (UAVs) are raising interest in spray applications in 3D crops. However, operational configurations of UAV-spray systems need further investigation to maximise the deposition in the canopy and minimise the off-target losses. Our experimental research focused on investigating the effects on the canopy spray deposition and coverage due to different UAV-spray system configurations. Twelve configurations were tested under field conditions in an experimental vineyard (cv. Barbera), derived from the combination of different UAV flight modes (band and broadcast spray applications), nozzle types (conventional and air inclusion), and UAV cruise speeds (1 and 3 m s-1). Also, the best treatment, among those tested, by using the UAV-spray system and a traditional airblast sprayer were compared. The data was analysed by testing the effects of the three operational parameters and their two- and three-way interactions by means of linear mixed models. The results indicated that the flight mode deeply affects spray application efficiency. Compared to the broadcast spray modes, the band spray mode was able to increase the average canopy deposition from 0.052 to 0.161 μL cm-2 (+ 309 %) and reduce the average ground losses from 0.544 to 0.246 μL cm-2 (- 54 %). The conventional airblast sprayer, operated at a low spray application rate, showed higher canopy coverage and lower ground losses in comparison to the best UAV-spray system configuration
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