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This is my team\'s final presentation to our Introduction of Mechanical Engineering Design, Innovation, and Entrepreneurship course at Purdue University. The task was to develop a unique workout device.
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Peak Performance Engineering
Problem Statement
Create Compact Total Body Workout Equipment That Provides Both:
• Cardiovascular Workout» Weight Loss / Fat Burning
• Strength Training» Muscle Toning / Muscle Building
Peak Performance Engineering
Problem Statement (Redefined)
Create Compact Total Body Workout Equipment That Provides Both:
• Upper Body Strength Training Capabilities» Muscle Toning / Muscle Building
• Lower Body Strength Training Capabilities» Muscle Toning / Muscle Building
Peak Performance Engineering
Market ResearchProduct Type Retail Sales Percentage of Sales
Aerobic Riders $25,000,000 0.66%
Aerobic Steps $5,000,000 0.13%
Cross-Country Ski Machines $50,000,000 1.34%
Elliptical Trainers $600,000,000 16.04%
Free Weights $130,000,000 3.48%
Home Gyms $540,000,000 14.44%
Rowing Machines $5,000,000 0.13%
Stair-Climbing Machines $180,000,000 4.81%
Stationary Exercise Bicycles $360,000,000 9.63%
Treadmills $1,650,000,000 44.12%
Weight Benches $195,000,000 5.21%
Total $3,740,000,000 100%
Peak Performance Engineering
Market Research
Peak Performance Engineering
Sales Quantity of Home Gyms
0
200
400
600
800
1000
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1400
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
Year
Qu
an
ity (
in t
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usan
ds)
Market Research
Peak Performance Engineering
0
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80
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Av
era
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rea
(s
qu
are
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et)
Aerobic riders
Cross-country ski machines
Elliptical cross-tra
iners
Free weights
Home gyms
Rowing machines
Single-station gym
Stair-clim
bing machine
Stationary cycles
Treadmills
Type of Equipmnt
Average Area Required for Fitness Equipment
Customer Requirements
Peak Performance Engineering
HOQ
Engineering Requirements
Peak Performance Engineering
HOQ
Operational Description
Peak Performance Engineering
Operational Description
Peak Performance Engineering
Operational Description
Peak Performance Engineering
Operational Description
Peak Performance Engineering
Operational Description
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Operational Description
Peak Performance Engineering
Operational Description
Peak Performance Engineering
Individual Parts
• ½” plywood cut to size• Padding & cover• Polypropylene straps
• Aluminum sheet metal bent to desired shape• Locating guides for pulleys welded to inside of box, with pulleys on• Cable tie-off welded to outside of box• Positioning hanger with locating hole welded to top of box
Peak Performance Engineering
Individual Parts
• Nylon 6/6 reinforced with glass fibers• Material injection molded to create part
• Nylon 6/6 reinforced with glass fibers• Material injection molded to create part• Rubber attached at end for sealing purposes
Peak Performance Engineering
Individual Parts
• Square aluminum tubing• Holes drilled and ends bent for attachment to Resistance Box
• Aluminum sheet metal• Bent to desired shape• Slots machined on sides for cable• Holes machined on end for buttons• Holes drilled for attachments
Peak Performance Engineering
Bill of Materials
Performance Analysis
• Engineering Models–Piston-Cylinder Model–Pulley-Weight System–Spring System–Exercise Wheel Design
Piston-Cylinder Model
• Resistance generated by vacuum.• Force is constant at absolute vacuum.• Vacuum maintained by vacuum seal.• Maximum force corresponds to diameter
of piston. F=P*π*r2
• Several cylinders used for resistance skill level.
Peak Performance Engineering
Assembly
Parameter Variation
Peak Performance Engineering
hi ≈ 0
di = 1.32”
F = 20lb
Vi ≈ 0 F = P * A A = π * r2 r = di / 2
Assumptions: Pressure inside piston starts at 1 atm, and density is 1.18 kg/m
3. Dynamic Vacuum seal on piston Constant room temperature
Piston/Cylinder Model
Peak Performance Engineering
Comparison Benchmarks
Benchmark - Cap Barbell Home Gym System
- Model outperformed or met customer requirements the same as the Cap Home Gym. (150 lbs vs. 180lbs)
- Reparability, the only issue for customer requirements.
Peak Performance Engineering
Pulley System Model
F F
F
mg
• Elaborate Pulley System
● Basic Configuration: Force-driven cable connected at one end to external surface, with the cable being wrapped around a pulley linked to a mass.
● Assumptions: Frictionless pulley, constant gravitational acceleration (9.81m/s^2), massless cables, massless pulley.
Peak Performance Engineering
Basic Calculations: (2 pulley configuration)
Fx = 0 Ax = 0Fy = 2F – mg = 0 F = (mg) / 2 (m)Ay = 2F – mg
Ay = ((2F) / m ) – g
For
ce
mg
Pulley System Model
Peak Performance Engineering
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Assembly
Comparison Benchmarks
Benchmark - Cap Barbell Home Gym System● Net weight of concept exercise device lower than Cap Barbell Home Gym. (170 lbs vs. 300lbs)● The ability of foldable bench legs helps in storage under beds or other furniture.
Peak Performance Engineering
Assembly Efficiency
• Goal: Maximize production efficiency, Minimize cost.
• Solution: Design for Assembly worksheet– Pinpoint faults, areas for improvement.– Obtain a DFA score
Peak Performance Engineering
First DFA Worksheet
46
01610128
Peak Performance Engineering
DFA Evaluation
• Improvements in overall assembly, part retrieval and part mating.
• Steps to implementation– Single pulley sizes– Lighter materials– Chamfers, round edges– Hinged legs
Peak Performance Engineering
3612
66
20
16
Second DFA Worksheet
Peak Performance Engineering
Assembly Efficiency
• Simple assembly for consumer.– Leg Hinges– Leg Extension Bar– Exterior Pulleys– Rail and Box Assembly
Peak Performance Engineering
Economic Analysis
• Purpose: Evaluate financial effectiveness of our product.
• Established Financial Analysis Diagram.
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Other Calculations
• Net Return on Investment: 55.6%• Net Rate of Return: 76.9%• Break-even Thresholds:
– Quarter 7– 4,488 units (assuming interest)
Peak Performance Engineering
Conclusions
• Unparallel total body workout in a compact design.– Strong niche in current market.
• Met or surpassed customer needs• Very profitable, low risk, investment• Conservative sales assumptions, great
entry opportunity
Peak Performance Engineering