Laboratory 3 Product Evaluation Overview Objectives t Background

Laboratory 3: Product Evaluation

Overview Objectives t Background t Materials t Procedure t Report / Recitation t Closing t

Objectives t Build a robot and test it against the EG standard (passes 80% of tests) t Define product evaluation, accuracy, and precision t Demonstrate the importance of product evaluation

Concept: Product Evaluation t Engineers perform prototype testing Look for improvement suggestions t Continuously improves product quality t t Tests are performed to a company standard If the standard is met, the product is acceptable t If standard not met, product may be redesigned or withdrawn t

Concept: Accuracy and Precision t Accuracy: t t Comparison of the average of the results to the standard Precision: Repeatability of the results t How close are the results to each other? t

Concept: Accuracy and Precision Accurate Precise Accurate Imprecise Inaccurate Precise Inaccurate Imprecise

Percent Accuracy and Precision %Acc=Percent accuracy Ps=Standard value Ap=Value measured Distance test: B=0. 0972 Angle of Deviation test: B=0. 0323 Rotation test: B=0. 0093 %Prec=Percent precision B=Exponential decay factor P=Actual precision measured

Materials Mindstorms Kit t Robot chassis building instructions t Large sheets of paper to record results t Meter stick t Protractor t

Lab Procedure: Student Tasks t Assemble robot according to chassis instructions t Program robot to perform three tests: t t t Distance Angle of Deviation Rotation t Perform tests, taking appropriate measurements t Determine whether or not robot meets 80% EG Standard

Procedure: Distance/Angle Test Distance Angle Rotation t DISTANCE AND ANGLE TESTS ARE PERFORMED AT THE SAME TIME Create distance/angle test program in Mindstorms t Download distance program to NXT t Run program for 5 seconds on testing paper to determine testing standard t Change program to run for 4 seconds t Record ten trials t

Procedure: Distance/Angle Test Reference point Robot Starting point Tracks robot traveled

Procedure: Rotation Test Distance Angle Rotation t Create rotation program in Mindstorms t Download rotation program to NXT t Run program for 5 seconds on testing paper to determine the testing standard t Change program to run for 4 seconds t Record ten trials

Procedure: Rotation Test Robot after rotation Reference point Robot before rotation Starting line

Tabulation of all Results t Tabulation Results in a chart: Accuracy %Acc Pass/Fail Precision %Prec Pass/Fail Distance Test Angle of Deviation Test Rotation Test t Determine if your robot passed the EG 1004 Standard of 80% t Must pass 80% of tests with 80% score

Report Independent report t Title page t Discussion topics in the manual t Include original data with TA’s signature t MUST include spreadsheet with test results, standard, average, accuracy, and precision of each test t

Report (continued) t Remember to hand in original data electronically, as part of report t Include photos of robot in Word document t TA will assist with digital camera

Presentation t t Team presentation Include photos of robot t t TA will assist with digital camera Refer to the presentation on Creating Power. Point Presentations found on the EG website

Closing Team members share tasks– i. e. one to program, another to build t Have testing paper signed by TA t Remember to submit all work electronically t t t Submit testing paper to TA at beginning of next lab Robots must remain assembled ü To be used for next lab t Return all unused materials to TAs