Project Readiness Package
Rev 11/14/12
ADMINISTRATIVE INFORMATION:
Bike Helmet Mirror System
•
Project Name:
•
Project Number, if known:
•
Preferred Start/End Quarter in Senior Design:
Fall/Winter
Fall/Spring
Winter/Spring
•
Primary Faculty Consultant:
Name
Dept.
Dr. Mario Gomes
ME
•
????
Email
[email protected]
Phone
585.475.2148
Faculty Technical Support:
Name
Dept.
Dr. Matthew Marshall ISE
Dr. Marca Lam
ME
Dr. Denis Cormier
ISE
Email
[email protected]
[email protected]
[email protected]
Phone
585.475.2520
585.475.6871
585.475.2713
Technical Expertise
Usability, Ergonomics, Safety
Vibrations
Rapid Prototyping, DFM, Fabrication
•
Project “Guide”: To Be Assigned
•
Personal Level of Interest: (interest level the PRP author has in participating on the project)
(Not Interested) 0 - - - - - - 1 - - - - - - 2 - - - - - - 3 - - - - - - 4 - - - - - - 5 (Very Interested)
Author’s Interest Level: 3
Reason for Interest Level:
The author is interested in this project because it focuses on producing a final deliverable much more polished than a
prototype. The author would like to continue working with Rob Fish, the ID student behind the concept, and see his
prototype turned into a viable product. The reason the author’s interest level is not greater than 3 is because the author
would prefer to work on an aerospace related project for Senior Design.
•
•
Student Team: (Students who have expressed interest in working on this project)
Student
Department
Rob Fish
Industrial Design
General Customers: (groups that will benefit from/use the final product)
o
o
•
Leisure Cyclists
Commuter Cyclists
Primary Customer, if known (name, phone, email): (end user of project output; articulates needs/requirements)
Name
Sharief B’dour
•
Year Level
5th Year
Email
NA
General Stakeholders: (groups that have a vested interest in the project)
o
o
o
o
o
o
o
Leisure Cyclists
Commuter Cyclists
Bike retailers
Parents of child cyclists
Bike Safety Activists
Current product competitors
Manufacturers
Page 1 of 6
Phone
(315) 529-5263
Project Readiness Package
•
Specific Stakeholders, if known (name, phone, email): (individual that has a vested interest in the product)
Name
Sharief B’dour
•
Rev 11/14/12
Email
NA
Sponsor(s): (provider(s) of financial support)
Name/Organization
Contact Info.
MSD Project Office
[email protected]
Phone
(315) 529-5263
Type & Amount of Support Committed
$500 (tentative)
PROJECT OVERVIEW:
Cyclists face hazards from all directions when sharing the road with motor vehicles. In a study on
bicycle accidents in Britain, Chih-Wei Pai demonstrated that roughly 40% of collisions between cyclists
and motor vehicles occur with the vehicle overtaking the cyclist from behind. One way to mitigate this
risk is to provide cyclists with a clear view of events unfolding behind them. Mirrors that mount to a
cyclist’s helmet already exist on the market. However, the view provided by these products can be
distorted depending on the material used. Some current products also fail to provide the user with an easy
method of adjusting the mirror’s orientation. Another drawback of several mirrors on the market today is
that they obstruct a significant portion of the cyclist’s forward
field of view. The author of the aforementioned study also
concluded that 20% of collisions between cyclists and vehicles
are “head-on” collisions. Consequently, it is advantageous to the
rider’s safety that a mirror obstruct his/her forward vision as little
as possible.
A two-mirror system that attaches to a cyclist’s helmet
had been proposed by Rob Fish, an RIT industrial design student.
The senior design team is tasked to design and test a helmet
based mirror system that improves upon currently available
mirror systems. The senior design team will work in conjunction
with Rob Fish to refine the existing concept and deliver a
www.coroflot.com/RobFish
product that meets the needs of the average cyclist.
Figure 1. Product Prototype in Testing
DETAILED PROJECT DESCRIPTION:
The senior design project will focus on producing a mirror
system that provides a clear image with a wide viewing angle to
the riding cyclist. Design emphasis will be placed on
minimizing the mirror’s obstruction to the cyclist’s forward
field of vision while providing a rear view to the rider. Safety
regulations will also need to be considered. For example, the
mounting method must not compromise the integrity of the
helmet. If it were to do so, the helmet would be in violation of
legal safety standards. Additional emphasis will be placed on
the design for manufacture aspect of the product in an attempt to
reduce the cost of materials and thus the cost to the consumer.
Ultimately, the focus of the project will be to deliver a mature
final product that is inexpensive, easily adjusted, and can be
installed on most bike helmets on the shelf today.
Page 2 of 6
www.coroflot.com/RobFish
Figure 2. Initial Concept
Project Readiness Package
•
•
Rev 11/14/12
Customer Needs and Objectives: (Listed in order of importance)
Customer
Importance
Description: The helmet mirror system…
(9 = most important)
Need #
CN1
9
…provides a clear, correctly oriented image.
CN2
9
…provides a wide angle view behind the cyclist.
CN3
9
…holds mirror orientation as set by user.
CN4
9
…is adjustable to provide optimal view for rider.
CN5
9
…minimizes obstruction to the cyclist’s forward field of vision.
CN6
9
…attaches to a typical helmet, without compromising helmet integrity.
CN7
3
…is safe to wear.
CN8
3
…detaches from the helmet.
CN9
3
…can be adjusted without the use of tools.
CN10
3
…is lightweight and comfortable to wear.
CN11
3
…is inexpensive ($10 - $20) for the consumer.
CN12
3
…requires no power input.
CN13
1
…is aesthetically pleasing.
CN14
1
…is durable.
CN15
1
…refrains from significantly increasing wind resistance.
CN16
1
…is fabricated in an environmentally friendly way
Functional Decomposition:
The diagram below outlines the functions of the mirrors and their supporting structure in simple verb
noun pairs.
Helmet
User
Adjustments
(Input Forces)
Helmet
Attach
Mirror
Secure
Setting
Support
Mirror
Mirror
Position
Adjust
Mirror
Resist
Wind Force
Drag Force
(Wind)
Wind
Main
Mirror
System Inputs
Head Position
Orient
Mirror
Rear Image
Collect
Light
Accept
Image
Transfer
Image
Front
Mirror
Reflect
Image
System Outputs
Rear Image to
Rider’s Eye
Note that this functional decomposition represents a two-mirror solution. The Senior Design team
will be free to move the design away from this approach as they see fit. This would change the
function decomposition diagram by either adding or removing mirror subsystems.
Page 3 of 6
Project Readiness Package
•
Rev 11/14/12
Potential Concepts:
See PRP Supplemental Document for potential concepts.
Specifications (or Engineering/Functional Requirements):
Specification
Unit of
Marginal
Source Function
(Metric)
Measure
Value
Power required for
S1 CN12
System
Watts
-operation
Number of tools
CN9,
S2
System
required for
Quantity
1
CN4
adjustment
•
S3
CN11
System
S4
CN6
System
S5
CN14
System
S6
CN10
CN3,
CN1
System
# of helmet styles
system can attach to
Durability – survive
drop from height
Weight
System
S7
Materials Cost
Ideal
Value
Comment/Status
0
No power input
0
Dollars
<$40
<$15
Quantity
--
>3
ft
--
6
lbs
0.3
0.175
Survive wind speeds
mph
<30
<35
Higher cost if concave
mirror used. Typical
market value
Dropped w/ mirror
system attached to
helmet
No bulk motion of
mirrors from desired
position & orientation
Based on NHTSA
neck injury criteria
Based on benchmarks
& eng. analysis
S8
CN7
System
Breakaway force
(if snagged on object)
lbs
S9
CN2
System
Rear image angle
degrees
>75
>90
S10
CN15,
CN 13,
System
in2
<18
<8
S11
CN16
System
%
--
100%
No restriction on
mirror material
S12
CN8
System
Yes/No
--
Yes
Interface between
helmet and supports
need not be removable
S13
CN5
System
degrees
--
180
Does not block lateral
vision when eyes are
looking straight ahead
S14
CN1
System
ft
>150
>200
Vehicle mirrors must
provide view at least
200ft to rear
S15
CN1
System
Yes/No
--
No
•
Projected area of
main mirror in
direction of motion
Recyclability of
materials used
(except mirrors)
Mirrors & supports
removable from
helmet
Lateral forward
viewing angle
Distance behind at
which vehicles are
visible
Image orientation
inverted?
<45
Project Deliverables: Expected output, what will be “delivered”:
1) A product that meets the above specifications and thus the needs of the customer. The final
product will be a polished devices that improves upon the already existing prototype by Rob Fish.
2) Design documents such as CAD models, bill of materials and financial documentation.
3) Testing and analysis documentation
4) Supporting Edge website with all supporting documentation
5) A proposed plan for manufacture that minimizes cost of production
Page 4 of 6
Project Readiness Package
•
Budget Estimate: Major cost items anticipated.
Item
Large Concave Mirror
Small Flat Mirror
3D Printed Parts
Bike Helmet
Misc. Hardware
Est. Total
•
Rev 11/14/12
Expected
Quantity
1
1
Sprt. Rails
1
??
--
Unit
Cost
$85
$2.21
-$17
Varies
--
Total Cost
Source
Comment
$85 + shipping
$2.21 + shipping
$20
$17
<$20 (inc. Shipping)
$150
edmundsoptics
cheapmirrortiles
estimated
walmart.com
non-ferrousfasteners
1 wk lead time
1 wk lead time
Brinkman Lab
no lead time
1 wk lead time
--
--
Proposed Budget: $500
The costs could be significantly lower if alternative mirror solutions were sought out. Flat
mirrors are much less expensive than large concave mirrors. Preferably, the budget would be around
the typical $500 senior design budget. This would allow for the ordering of spare parts, and the
possibility of the team to conduct potentially destructive testing on a prototype. In addition to the
items listed above, epoxy, gauge wire, and aluminum could be incorporated in the fabrication of the
product and would contribute to the cost of materials.
•
Intellectual Property (IP) considerations: The intellectual property generated during this project
will belong to the students working on the project and Rob Fish.
•
Continuation Project Information, if appropriate: There is no proposed continuation plan for this
project, nor does this project build off of a previous senior design project.
STUDENT STAFFING:
•
Skills Checklist:
See PRP supplemental document for skills checklist
•
Anticipated Staffing Levels by Discipline:
How
Discipline
Anticipated Skills Needed
Many?
ME 1: Optical analysis and design of mirror system, including CAD,
associated testing, attachment ergonomics (with ISE)
ME
2
ME 2: Structural analysis and design of mirror support system, including
CAD, vibration/modal analysis using computational FEM, associated
testing
ISE 1: Ergonomics (attachment & removal of device, wearability),
ISE
1
usability and human interface, design of experiments, design for
manufacturing, safety aspects, life cycle analysis
Other
•
1
ID 1 – Rob Fish: Aesthetic design
Alternate EE Heavy Project Variant: There is no EE heavy version of this project due to the fact
that one driving constraint is that the final product require no power. This stipulation includes any
form of electrical energy.
Page 5 of 6
Project Readiness Package
Rev 11/14/12
OTHER RESOURCES ANTICIPATED:
Category
Faculty
Resource
Available?
Description
Ergonomics, User Safety, & Design for Manufacture technical support
Rapid Prototyping technical support
Vibrations technical support
Environment
MSD design lab
Brinkman lab, for rapid prototyping
Machine shop, for various fabrication needs
Equipment
3D printer
Materials
3D printer material
Mirrors
Various hardware
Other
Prepared by:
Stephen R. Wess
Date:
Page 6 of 6
11.14.2012