ABE Principles: Machine Systems Tony Grift, PhD Dept. of Agricultural & Biological Engineering.

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Presentation transcript:

ABE Principles: Machine Systems Tony Grift, PhD Dept. of Agricultural & Biological Engineering

Main topics Fluid power –Fundamentals of pressure and flow –Calculation of Pressure, Force/work/Power, flow rate, piston speed –Implementations Pumps/Motors/Valves/Actuators Engines –Working Spark/Combustion Ignition, engine components –Power calculations Air cannon –Adiabatic expansion theory –Ballistic model Machinery –Fertilizer application –Combine harvesting

Labs Fluid Power 1.Cavitation/aeration 2.Pressure relief valve characterization 3.Directional control valves 1.Engines 1.Dynamometer lab 2.Cannon 1.Data collection and Excel spreadsheet 2.Solving Differential Equations, link Excel and Matlab 3.Machines 1.Fertilizer application lab 2.Corn harvesting lab

Fluid Power Labs

Computer homework using FluidSim

Week 4: Air cannon

7 Cannon theory: Isochoric (const. volume) Isothermal (const. temperature) Adiabatic (no heat exchange with environment: fast processes!)

Cannon lab1a: Measure air time of various projectiles

Cannon lab1b: Excel spreadsheet includes adiabatic expansion model

Cannon lab 2: Couple Excel and MatLab, solve ballistic equations

Corn harvesting lab: Students get to drive the machine!

Score histogram of ABE : 50% =A, 33% =B, 16.6% <= C 12 AA+ BCDF