Lab 06: AEV System Analysis 2 Advanced Energy Vehicle (AEV)

AEV Project Objective (Problem Definition) INITIAL CONCEPTS (Brainstorming) EXPERIMENTAL RESEARCH ANALYZE DESIGN DECISION RESEARCH COMPARE FINAL DESIGN Present AEV Design PT 1 PT 2 PT 3 PT 4 (System Analysis)(Programming)

Learning Objectives  Download data from the automatic control system.  Convert EEProm Arduino data readouts to physical engineering parameters such as distance traveled and velocity.  Calculate the performance characteristics of the AEV.

Distance and Velocity  Using the wheel count sensor, we can calculate the following: Distance Velocity Kinetic Energy s = distance (meters) v = velocity (meters/seconds) s = distance (meters) t = time (seconds) KE = Kinetic Energy (joules) m = Mass (kilograms) v = velocity(meters/second)

AEV Performance Characteristics  The efficiency of the system is composed of both the propeller and the electric motor:  The efficiency is defined as the ratio of the power available (output) and the power supplied (input):

AEV Performance Characteristics  The efficiency of the propulsion system is a function of the AEV’s velocity and the propeller RPM:  We can use non-dimensional analysis to create a parameter to be able to combine the independent variables.  These independent variables are different for each AEV and Arduino control program.

Advance Ratio  Using Buckingham Pi Theorem, we are able to reduce the number of dependent variables for the efficiency from two to one:  “J’ above is known as the Propeller Advance Ratio which is given by RPM = Revolutions per Minute v = velocity(meters/second) D = Propeller Diameter (meters)

Advance Ratio Limits  The propeller testing and sample characteristics are generated for a range of propeller advance ratios and expressed as:  This needs to be applied to your data for both System Analysis 2 and later with System Analysis 3

Propeller RPM  The propeller RPM is a function of the current being supplied to the motor by the command inputs.  The following are sample supplied characteristics** of the two various size propellers: **We will revisit the RPM curves in System Analysis 3 and update the trendline above.

Propeller Efficiency  You are provided with sample propeller advance ratio** characteristics: ** We will revisit the propeller efficiency in System Analysis 3and update the trendline above.

Questions?