Physical quantity, systems of measure and elements of metrology. Static kinematics and dynamics. Passive resistances. work, energy and power. Elements of termology, thermodynamics and termotecnics. Elements of energetic.
A general view on agricultural mechanics and mechanisation. Machines classification and efficiency. Power transmissions. Hydraulic, pneumatic, thermal and electric machines and their agricultural use. Tractors and farm equipments: technical and operational aspects; couplin
M. SCOTTON, basic of applied phisics to agricultural machinery, Edagricole, Bologna 1989.(Biblioteca di Facoltà)
Bodria L., Pellizzi G., Piccarolo P., Meccanica Agraria, vol. I e II, Edagricole, 2006 ISBN-88-506-5131-7 (Vol II - ISBN-88-506-5132-5 )
Collection of scientific publications.(Library of Department DEISTAF)
Learning Objectives
Apply physics laws for the main problema of agricultural engineering
Sizing, and selecting tractors and equipments for the main agricultural works.
Prerequisites
Mathematics
Teaching Methods
Video projector, PC, overhead projector, experimental fields, labs
Type of Assessment
Written and Oral Exams
Course program
Measuring physics quantities, path and motion equation. Mean and instantaneous velocity. Acceleration. Rectilinear uniform motion and with constant acceleration. Vector quantities and motion composition. Circular and periodic motion. Fundamental laws in the translation dynamics. Constrained motion. Rotary motion. Moment of force. Equations of dynamics and statics of a rigid body. Friction forces: sliding, rolling. Traction forces. Viscosity. Apparent forces. Work and power: of a force, a torque and of pressure. Translation and rotary Power. Kinetic energy theorem. Mechanical energy conservation. Thermodynamic: general. Temperature measurement. State variables and equations; ideal gas. First law, state transformations. Second law. Elements of energetic.
Machines classification. Efficiency. Power transmission. Friction and gear wheels. Differential unit. Belt and chain drives. Joints. Hydraulic machines.
Hydraulic transmission. Pneumofore machines. Engine. Cycles
basic components and operating principle, performance, power consumption. characteristics and performance curves. Agricultural tractors. Types, structure and main parts.
Systems of propulsion. Systems of driving. Mode coupling tractors-operative machines. Hydraulic lift. Position and controlled effort. Tractor power take-off shafts and types of use. Driving wheel, adhesion, coefficient
adhesion, slippage. Maximum strength of adhesion. Types of use and performance related. Determination
tractor suitable. Power requirements and maximum power. Case of soil working.
Verification of adhesion. Equipments operating by the PTO and combined. Power used
and fuel consumption. Equipments for working the soil. Equipments for distributing products, fertilization, sowing, crop protection. Equipments for harvesting. Working capacity, Available real time. Technical operational assessments for choosing, sizing and using tractors and machinery. Elements of ergonomics and safety.