Laboratory 5: Quality, Test & Data Analysis General Engineering Polytechnic University

Overview Objective Product Evaluation Measurements Accuracy and Precision Materials for Lab Problem Statement Procedure Written Assignment Recitation Topics Closing

Objectives Understand the concept of product evaluation Learn the importance of troubleshooting and recording measurements Use your new knowledge to test the WAO II Robot and organize the data in a clear and presentable way

Product Evaluation Engineers test prototypes and make suggestion for improving the product Ensures a quality product is being sold to the consumer

Measurements Standard - the expected value = P s Average (mean) = A p = Accuracy (error) = Precision (repeatability) = P 1 +P 2 +P 3 +…+P N N | P S - A P | P high - P low OR ± P high - P low 2 N = # of measurements P = parameter

Accuracy and Precision Accurate Precise Inaccurate Precise Accurate Imprecise Inaccurate Imprecise

Materials for Lab WAO II Programmable Robot Toolbox

Problem Statement You have just been hired by an engineering firm that makes robots. These robots are sold for a little less than $ Your boss has asked you to test this prototype, and to make suggestions for improving the final design.

Procedure General –If the robot does not work properly --troubleshoot and figure out what is wrong A different robot will be given to the team if the problem cannot be fixed –For each of the tests find the: standard average accuracy precision General Distance Test Angle of Deviation Test Rotation Test Robot Time Unit Test

Procedure Distance Test –Run robot in a straight path for 1 unit of time Distance traveled = standard value (standard for 1 unit of time) Standard value * 5 = standard for 5 units of time –Run robot for 5 units of time, repeat 10 times Mark exact location of where the robot stops Draw a straight line from the starting & ending points Measure the distance for each trial STARTEND General Distance Test Angle of Deviation Test Rotation Test Robot Time Unit Test

Procedure Angle of Deviation Test –Use straight lines drawn from the distance test –Measure each angle of deviation (  ) (should have 10 values total) –Use positive angles if robot turned left and negative angles if it turned right STARTEND  General Distance Test Angle of Deviation Test Rotation Test Robot Time Unit Test

Procedure Rotation Test –On a sheet of paper mark: The center of the robot (1/2 the distance where the wheels lay) The location of the back center of the robot (your starting mark) –Rotate robot counter clockwise for 3 units of time Mark the location of the back center of the robot (your end point) –Draw two straight lines from: The center of rotation to the starting point The center of rotation to the end point –Center a protractor on the center of rotation and find the angle of rotation –Multiply this value by 3 to obtain the standard value. –Do this 10 times for 9 units of time General Distance Test Angle of Deviation Test Rotation Test Robot Time Unit Test

Procedure Robot Time Unit Test –Choose distance for robot to travel(should be more than 2 feet) –Set robot to run on straight path infinitely –Measure amount of time robot takes to travel chosen distance (first trail is standard) –Repeat 10 times using same distance STARTEND General Distance Test Angle of Deviation Test Rotation Test Robot Time Unit Test

Written Assignment Use the form report on Page 61 to complete the lab report (Be sure to type out your answers on a different piece of paper) Include original data with the instructor’s initials Include a spreadsheet with the result of the four tests, complete with the standard, average, accuracy, and precision of each test Remember to create a title page

Recitation Topics Discuss the testing method that you employed. Explain the terms average, accuracy, and precision as they relate to the WAO II Brainstorm better testing methods, and other possible tests to determine the robot’s performance Discuss the importance of disassembling a product before testing it Discuss the importance of testing products in the engineering field If the robot did not work correctly, discuss possible reasons for failure

Closing All four tests must be performed Additional testing is allowed if time permits Return the Robot and toolbox to your instructor