System Design – Part 1 P14031: Jib Transfer Bench Matt Brunelle Nicole Conway Mike Kennedy Katy Wurman 1
Agenda Tuesday – Project Management Discussion • Problem Statement and Background o Customer Requirements & Engineering Requirements o House of Quality o Functional Decomposition o Risk Assessment o Test Plans o Project Schedule o Thursday – Design/Concept Discussion • Problem Statement & Team Introduction o Benchmarking o Concept Generation o Pugh Analysis & Concept Selection o Feasibility Analysis o Customer Feedback o 2
Team Introduction and Roles Member Major Role Matthew Brunelle Mechanical Engineer Engineer Nicole Conway Mechanical Engineer Engineer Michael Kennedy Mechanical Engineer Engineer Katy Wurman Industrial Engineer Project Leader 3
P14031 Problem Statement Current State • A jib transfer bench was created in Spring 2013 (P13031) that is heavy, o expensive, labor-intensive to assemble, and accommodating of a strict size constraint present at the time. Desired State • A jib transfer bench that enables a jib trimmer to move transversely across the o width of the sailboat, without the use of their legs or core muscles. Project Goals • A fully-functional prototype that is: o lighter • cheaper • easier to assemble and manufacture • Constraints • Designed for use with the Sonar class of sailboats o Completely mechanical solution o Designed for ease of reproducibility o Cannot require alteration of the boat or cause damage o 4 1-page Project Summary (EDGE)
Stakeholders • Piers Park Sailing Center • Caitlyn Connolly, Adaptive Recreation Director • Staff and Volunteers at Piers Park • Disabled sailors or potential sailors • RIT • MSD team 5
Customer Requirements - Old Customer Reqt # Importance Description CR1 1 Make it easier for the jib trimmer to move between port and starboard Decrease the time required for the jib trimmer to move between port and starboard CR2 2 (compared to if they have no use of their legs and limited core strength without an assistive device) CR3 1 Lightweight design CR4 3 Eliminate the need for the jib trimmer to make contact with the floor of the boat while moving between port and starboard CR5 1 Provide jib trimmer access to the jib lines CR6 1 Design is an entirely mechanical solution CR7 2 Normal entry and exit from device is easy CR8 1 Device is safe in emergency CR9 1 Provide support for core (possibly legs) CR10 2 Device is easy to install CR11 1 Corrosion resistance CR12 1 Device does not hinder the ability to see/observe surroundings (people, conditions, boats) CR13 1 Device is safe to operate/use around all people in the boat CR14 2 Design has minimal manufacturing time of components (custom parts) CR15 1 Machining minimizes the use of specialized equipment CR16 1 Device cost is the same or less than the current design CR17 2 Seat should accommodate multiple body types CR18 1 Device must fit in the Sonar class of sailboat 6 Importance Scale: 1 = High Priority, 2 = Medium Priority, 3 = Low Priority
Customer Requirements - New 7 Importance Scale: 1 = High Priority, 2 = Medium Priority, 3 = Low Priority
Engineering Requirements - Old CR# Customer Requirements Metrics Direction Units Marginal Target Make it easier for the jib trimmer to move between port and Maximum force required to traverse the width of ↓ CR1 lbs of force starboard the boat Decrease the time required for the jib trimmer to move between ↓ CR2 port and starboard (compared to if they have no use of their legs Transfer time between port and starboard Seconds 5 2 and limited core strength without an assistive device) ↓ CR3 Lightweight design Total weight of device Pounds 100 50 Eliminate the need for the jib trimmer to make contact with the CR4 Is contact required? Binary Yes/No - No floor of the boat while moving between port and starboard Are lines accessible? Binary Yes/No - Yes CR5 Provide jib trimmer access to the jib lines ↓ User's reach distance to access lines Inches 25 15 CR6 Design is an entirely mechanical solution Does the design only contain mechanical parts? Binary Yes/No - Yes ↓ Time to get into seat Minutes 5 2 CR7 Normal entry and exit from device is easy ↓ Time to get out of seat Minutes 5 2 Time to release from device (in case of ↓ CR8 Device is safe in emergency Seconds 5 2 Emergency) Deivce's weight capacity (at upright seated ↑ CR9 Provide support for core (possibly legs) Pounds 220 265 position) ↓ CR10 Device is easy to install Time to install Minutes 20 5 Are all components chosen for corrosion CR11 Corrosion resistance Binary Yes/No - Yes resistant properties? Does the device hinder the crew's ability to Binary Yes/No - No CR12 Device does not hinder the ability to see/observe operate the boat? surroundings (people, conditions, boats) ↑ User's rotation in device (to each side) Degrees +/- 30 +/- 45 ↑ CR13 Device is safe to operate/use around all people in the boat Vertical distance between seat and boom Inches 33 38 Percentage of custom parts used in design CR14 Design has minimal manufacturing time of components (custom ↓ (custom parts cannot be purchased 'off-the- Percentage 15 5 parts) shelf' in a store or online) Percentage of custom parts used in design ↓ CR15 Machining minimizes the use of specialized equipment (custom parts cannot be purchased 'off-the- Percentage 15 5 shelf' in a store or online) ↓ CR16 Device cost is the same or less than the current design Total cost to manufacture Dollars % of users tested who find seat ↑ CR17 Seat should accommodate multiple body types Percentage 60 75 "comfortable" 8 CR18 Device must fit in the Sonar class of sailboat Does device fit? Binary Yes/No - Yes
Engineering Requirements - New 9
House of Quality ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↑ ↓ ↓ ↑ ↑ ↓ ↓ ↓ ↑ Direction of Improvement: Maximize (↑), Minimize (↓), Target (X) X X X X X X Are all components chosen for corrosion resistant Time to release device from boat (in emergency) Does design only contain mechanical parts? Customer Requirement Number Distance between existing bench and seat Percentage of custom parts used in design Vertical distance between seat and boom Does design require boat modification? Is fixture permanently fastened to boat? % of users who find seat "comfortable" Engineering Metrics Customer Need Category Number of potential pinch points Time to remove device from boat User reach distance to jib lines Extremities in safe position? Number of installation steps Unobstructed field of view Customer Weights Steps to uninstall device Time to get out of seat Time to get into seat Degree of rotation Secure fit in Sonar Weight of Device Weight capacity Time to install Transfer time properties? Customer Needs CR 1 1 Move between port and starboard (for weight distribution) 9 3 3 CR 2 1 Trim jib lines 9 3 Jib Trimmer CR 3 2 Can be used for racing 9 9 9 9 3 CR 4 1 Safe for user 1 1 3 9 3 3 1 CR 5 1 Safe for crew 1 3 1 CR 6 1 Support the user 1 3 3 CR 7 2 Typical entry/exit is easy 9 9 CR 8 1 Easy to assemble 3 1 CR 9 2 Volunteers can install/uninstall without extensive training 1 1 3 9 3 9 CR 10 1 Does not designate a specific boat for use solely with device 9 1 1 1 3 1 Piers Park CR 11 2 Easy to reproduce 1 9 CR 12 2 Low cost 1 1 9 CR 13 2 Can be used with wide range of users 3 CR 14 1 Works specifically in Sonar hull 9 CR 15 1 Does not damage boat 9 3 1 1 CR 16 1 Does not require boat modification 9 3 1 CR 17 1 Can be used in salt-water environment 9 in Yes/ No mm Yes/ Yes/ % Sec TBD Sec Min lbs Yes/N % Yes/ Units Sec No lbs # Min # Deg. In % Sec # No o No Target Values 2 15 Yes Min. No No 50 0 100 2 - 2 2 265 Yes 5 5 +/-45 38 5 5 5 75 Yes Raw score 20 28 9 9 45 39 14 9 6 18 12 9 9 25 2 5 11 12 6 20 9 11 3 26 Relative Weight 6% 8% 3% 3% 13% 11% 4% 3% 2% 5% 3% 3% 3% 7% 1% 1% 3% 3% 2% 6% 3% 3% 1% 7% 10
Pareto Analysis Highest Overall Importance ER: Design complies with ISAF/IFDS • requirements Provide user access to jib lines • Device is secure in Sonar boat • Device is easy to install • Device is lightweight • Device is safe in an emergency • Maximizing the range of movement • Minimizing the transfer time • between port and starboard 11 Full HOQ on EDGE
Functional Decomposition 12
Functional Decomposition 13
Functional Decomposition 14
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