ANALYSIS

Analysis focuses on the effectiveness and design of the vehicle. Students intended to prove all engineering decisions with engineering analysis. an analysis, referred to at CWU as a green sheet, commonly included kinematics, statics and dynamics. Green sheets regarding design often referred to mechanics of materials to determine suitable dimensions for design strength. Important decisions were always backed by green sheets.

The requirement reviewed in analysis 3 is “The drivetrain will be able to sustain a speed of 25 miles per hour or more.” (Section 1.d.3). A green sheet analysis on the kinematics and dynamics was completed to determine a suitable gear ratio to achieve this speed. Nathan completed work with dynamics to determine the RPM of the motor, and then determined the RPM the wheel would need to spin to achieve 25mph. This math confirmed that a geartrain with an 11:1 gear ratio would need to be utilized in the vehicle design. This was documented in appendix A03.

Shear and Deflection on rear torque tubes-1.png

This green sheet was intended to affirm that a created design would be suitable for its application in the vehicle. The analysis utilized mechanics of materials to test the deflection and shear of a design. This design was found suitable and used in the final assembly.

This green sheet was intended to determine a suitable dimension for the frame rails, NCN-20-101. The analysis focused on deflection, per requirement 1.d.12, the frame must deflect less than 5mm. This analysis helped students meet expected requirements as well as engineer a suitable design.