Product Evaluation & Quality Improvement. Overview Objectives Background Materials Procedure Report Closing.

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Presentation transcript:

Product Evaluation & Quality Improvement

Overview Objectives Background Materials Procedure Report Closing

Objective Build a robot and test it against the EG standards for accuracy and precision Demonstrate the importance of product evaluation Disassemble the robot and make quality improvements to the design

Design Analysis 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a company standard If the standard is met, the product is acceptable If standard not met, product may be redesigned or withdrawn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 & Precision Accuracy: Comparison of the average of the results to the standard Precision: Repeatability of the results How close are the results to each other?

Accuracy & Precision

Where = Percent Accuracy = Standard Value = Value Measured

Accuracy & Precision Where = Percent Precision = Exponential Decay Factor = Actual Precision

Accuracy & Precision 360 o Reference Point Path traveled Starting Point

Quality Improvement Analyzing the design Testing the design Through physical or mathematical modeling or computer modeling Does the robot perform to standard? If no, what can be done to improve its functionality? If yes, what can be done to improve its performance beyond the standard??

Reverse Engineering Understanding how a product functions Disassembly of said product Noting the key components Reverse Engineering is carried out in both software and hardware fields

Gears Used to manipulate torque and speed Torque & speed are inversely proportional Velocity ratio equals inverse of gear ratio Values for Output and Input are the diameters (or the number of teeth) of the respective gears

Gears There are many different types of gears Crown, worm, spur, rack, idler gears Full description of each type of gear can be found on EG Manual Please take note of gear and velocity ratios since they are extremely useful with SLDP robots

Materials Mindstorms Kit Computer with Mindstorms Software Protractor and Ruler Graph Paper

Procedure Build a robot according to the robot provided by your TA Program robot to perform two tests Distance Angle of Deviation Determine if robot meets the 80% EG Standard Reverse engineer the robot and make quality improvements to the design

Procedure - Testing Distance & Angle tests are performed simultaneously Create distance/angle test program. Download distance program to NXT/EV3 Run program for 5 seconds on testing paper to determine testing standard Change program to run for 4 seconds Record five trials and average these values

Procedure - Reverse Engineering Assess data collected and any observations Visually assess the robot's design Consider how it works Sketch the front, top, and most detailed side of the robot (include dimensions) Sketch the gear train and calculate velocity and gear ratios (if applicable)

Procedure - Reverse Engineering Before making changes to the original robot, remember to take a picture of it Make necessary adjustments Retest and collect data using modified robot Take a picture of final design Like before Sketch the front, top, and most detailed side of the robot (include dimensions) Sketch the gear train and calculate velocity and gear ratios (if applicable)

Procedure Tabulate Results in a chart: It must pass all the tests at a percentage of at least 80% Accuracy% AccPass/FailPrecision% PrecPass/Fail Distance Test Angle of Deviation Test

Report Individual Lab Report Title page Discussion topics in the manual MUST include spreadsheet with test results, standard, average, accuracy, precision, gear ratios, and velocity ratios

Presentation Team presentation Follow “Your Assignment” guidelines on EG Manual Include photos of robot

Closing Share tasks – one team member to program; another to build Have all original data signed by TA Remember to submit all work electronically Submit testing paper to TA at beginning of next lab Disassemble robot and sort parts into the kits Return all unused materials to TAs