I MECHANICS OF MACHINES
Introduction .
Size and units : technical system and SI . Calculation graph: tracking diagrams and related scales . General information about elements and kinematic pairs .
Bullets and complements of kinematics and dynamics of rigid motion .
Trajectory, velocity , acceleration , equations of motion and energy in the motions translatorio , axial rotation , rigid floor. Decomposition of the absolute motion in relative motion and drag: theorems of Coriolis and Rivals. Kinematics and dynamics of elementary mechanisms ( ordinary crank centered, quadrilateral , glyph ) .
Forces acting in machines.
Weight. Inertia forces . Forces of the elastic type . Forces of contact between solids. Sliding friction and its laws. Attrition. Rolling friction . Forces acting between the lubricated surfaces.
Dynamics of machines .
Absolute regime, periodic varied. Forces and torques , durable, passive. Work and power of the forces in machines. Connection to motor - transmission - load. Transmission ratio. Mechanical efficiency . Connecting mechanisms in series and in parallel. Reduction of forces and masses. Energy equation . Motorcycles in absolute regime , direct and retrograde . Unsteady : acceleration and braking . Motorcycles in periodic regime : periodic irregularities and calculation of the flywheel. Balancing of rotating rigid systems .
Simple theory of vibration.
Free vibration and forced vibration of single degree of freedom systems . Application to the foundations of the machines. Instruments for measuring vibration. Work on systems to N degrees of freedom. Bending and torsional critical speed .
II ORGANS OF MACHINES
II Bodies of machines ( description and operation) .
Transmission shafts and relative connection elements . Rigid couplings , rubber bands, joints, hydraulic . Notes on the grafts. Bearings and sliding bearings . Sprockets flat spur and helical gears with involute profile . Toothed wheels conical . Couple worm - worm wheel. Ordinary gearing . Planetary gear trains . Flexible Bodies : belts, ropes. Chocks and tape. Bodies of connection: screws, bolts .
III MACHINES
General .
Energy equation for a current of compressible and incompressible fluid in stationary state . Energy into a machine as chemical , calorific value . Energy transformation in a car, performance characteristics . Machine classification .
Piston pumps .
Description . Characteristic variables and relationships between them : prevalence, geometrical magnitudes , average speed , flow rate, average power returns. Suction height . Nod on air cases . Nod over other pumps : a capsulismo , gear .
Pumps fluid .
Prevalence theoretical and actual supplied by an impeller , effect of action and reaction , a function of the diffuser . Centrifugal pumps and axial description. Characteristic variables and relationships between them. Curves and influence them in choosing the pump. Speed characteristic ns, and the most affordable forms of the pump variant ns . Suction head , cavitation , priming. Various control systems .
Fans .
Schematic description of the various types of fan and related uses. Sizes and characteristics .
Compressors .
Piston compressors . Description . Bullets on the cycle of the compressor. Characteristic variables and relationships between them. Multi-stage compressors . For flow control . Outline of compressor fluid .
Internal combustion engines .
Various types of motors and their reference cycles . 4-stroke engines and spark ignition ( Otto) and compression ignition (diesel) engines . Theoretical cycle and limit cycle . Examination of combustion. Intake, exhaust , and related work . Mechanical losses . Returns. Degree of filling ( volumetric efficiency ) . Characteristic quantities ( geometrical magnitudes , mean effective pressure , the actual average speed , time consumption and specific , etc. . ) And the relationship between them. Characteristic curves . Construction components , power systems and power . Fuels . Two-stroke engines .
Hydraulic drive .
Various types : Pelton , Francis , Kaplan, description, sizes and characteristics . Speed characteristic and selection criteria and use . Nod on the regulation.