Advanced Energy Vehicle AEV Lab 06 AEV System

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

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

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: s = distance (meters) • Distance • Velocity • Kinetic Energy 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 3 and update the trendline above.

Questions?