Laboratory 2: Hardware Analysis and Synthesis

Overview  Objectives  Background  Materials  Procedure  Report / Recitation  Problems  Closing

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

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standard  If the standard is met, the product is acceptable  If standard not met, product may be redesigned or withdrawn

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

Accurate Imprecise Inaccurate Imprecise Inaccurate Precise Accurate Precise

Percent Accuracy and Precision Distance test: B= Angle of Deviation test: B= Rotation test: B= %Acc=Percent accuracy PsPs =Standard value ApAp =Value measured %Prec=Percent precision B=Exponential decay factor P=Actual precision measured

Materials  ROBOLAB Kit  Robot chassis building guide  Large sheets of paper to record results  Meter stick  Protractor

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

Procedure: Distance Test  DONE AT SAME TIME AS ANGLE TEST  Assemble chassis according to handout  Handout instructions do not include wheels  Create distance/angle test program in ROBOLAB  Download distance program to RCX  Mark start point on the sheet of paper  …[continued] Distance Angle Rotation

Procedure: Distance Test (continued)  Place robot at start point  Run the program for 5 seconds and measure the distance traveled by robot  Determine standard for this test by dividing distance traveled by 5 and then multiplying by 4  Go back to ROBOLAB program and change time from 5 seconds to 4 seconds  Measure distance traversed  Repeat testing ten times Distance Angle Rotation

Procedure: Angle of Deviation Test  DONE AT SAME TIME AS DISTANCE TEST  Draw a straight line (0° line) on the sheet of paper  Identify a reference point and align robot on line  Run program  Draw a line from start point to endpoint  Measure angle of deviation  Repeat test 10 times Distance Angle Rotation

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

Procedure: Rotation Test  Create rotation program in ROBOLAB  Download rotation program to RCX  Mark a center point on the paper  Place the robot on the paper and set a reference point  Run program for 5 seconds  Measure angle of rotation of robot  Divide value by 5 to determine angle of rotation per second  …[continued] Distance Angle Rotation

Procedure: Rotation Test  Multiply by 4 to determine standard rotation for 4 seconds  Go back to ROBOLAB program and change time from 5 seconds to 4 seconds  Download program to RCX  Run program and measure rotation of robot  Repeat test 10 times Distance Angle Rotation

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

Tabulation of all Results  Tabulation Results in a chart :  Determine if your robot passed the EG1004 Standard of 80%  Must pass 80% of tests with 80% score Accuracy%AccPass/FailPrecision%PrecPass/Fail Distance Test Angle of Deviation Test Rotation Test

Report  Independent report  Title page  Discussion topics in the manual  Include original data with TA’s signature  MUST include spreadsheet with test results, standard, average, accuracy, and precision of each test

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

Presentation  Team presentation  Include photos of robot  TA will assist with digital camera  Refer to the presentation on Creating PowerPoint Presentations found on the EG website

Closing  Team members share tasks– i.e. one to program, another to build  Have testing paper signed by TA  Remember to submit all work electronically  Submit testing paper to TA at beginning of Lab 3  Robots must remain assembled To be used for Lab 3  Return all unused materials to TAs