Adjustable Gold Metal Seatedge.rit.edu/content/R13031/public/WorkingDocuments/Gold Medal S… · pedestal can be proven to be feasible, there may not be enough strength in the mounting

Adjustable Gold Metal Seat

MSDI Desired start: Winter 2012 MSDII Desired: Spring

2012

Project Description:

This project will take a current system that

allows a specific quadriplegic sailor, in a specific boat to

steer and make it adaptable to both different people

and boats. The system will consist of a seating support,

steering hand crank and tiller strut. The system will use

a sourced, adjustable seat. The seating location will be

adjustable from front to back and in height. The hand

crank location will also be adjustable front to back and

up and down as will the leg rests. The system should be

easy to install and lightweight.

Current tentative MSD team: 3 mechanical engineers, 1

industrial engineer, Richard Ramos as the primary

customer, Professor Leipold has a faculty consultant and

Mr. Burhans as a stakeholder.

Feasibility: This project has the interesting design issue of adding adjustability to all components of a

system. The project has been shown to be feasible by identifying major risks and mitigating them. An

example is the hand crank adjustability was shown to be feasible by evaluating the shear in an adjusting

pin and the “wobble” of the system.

Current system shown with adjustability

concepts.

Automotive Syle Seat Track

Rides on Screw such as bed on

lathe

Bolted connection with multiple

positions

Pinned Connection with multiple

connections

These forward and back adjustments would be valid for the leg rests

Forward and Back adjustments Bench Marking Table

These forward and back adjustments would be valid for the leg rests

as well as the seat.

Could be Purchased and added yes no no no

Easiy to implement to seat Yes no yes yes

Easy to implement to leg rests no no yes yes

Easy to adjust on the fly yes yes no yes

https://www.carpartsdiscount.com/auto/parts/68/chevrolet/camaro/seat/seat_track_lh_2pc.html?3593=4826

http://image.made-in-china.com/2f0j00weTQkoLPnMbB/Lead-Screw-and-Feed-Shaft-Lathe-WF230-1500-.jpg

Screw Jack System Pinch Clamp System

Bolted connection with multiple

positions Sissor Jack System

Pined Connection System

simular to bolted connection

These benchmarks are for current systems that have an adjustable

height. The portions of this project where these apply are the hand

crank, seat, and the leg rests.

Height Adjustablility Benchmarking Table

crank, seat, and the leg rests.

Allows for infinited adjusted positions Yes Yes No Yes No

Difficulty adapting to Seat Height Adjustment Dificult Medium Diffuculty Medium Diffuculty Easiest Medium Diffuculty

Difficulty adapting to leg rest and Hand crank Difficult Easy Easy Most Difficult Easy

Easy to adjust on the fly No Yes No Yes Yes

Photos:

http://www.google.com/imgres?hl=en&biw=1410&bih=914&tbm=isch&tbnid=Q0bi3-5h6ZOnaM:&imgrefurl=http://terryfurniture.co.uk/index.php/products/view/products2/34&docid=O3XGfeUUgIKZnM&imgurl=http://terryfurniture.co.uk/images/made/Cast_Iron_Stool_large_700_500_c1.jpg&w=700&h=500&ei=ZbOIUNiTOpTK0AG6lYH4Aw&zoom=1&iact=rc&dur=220&sig=102836474452851656036&page=1&tbnh=140&tbnw=203&start=0&ndsp=30&ved=1t:429,r:1,s:0,i:71&tx=125&ty=41

http://www.montaguebikes.com/assets/images/ownermanual/quick-release-seat.jpghttp://www.montaguebikes.com/assets/images/ownermanual/quick-release-seat.jpg

http://www.polopuentearanda.com/wp-content/uploads/2011/10/wpid-wpid-scissor-adjustable-height-table.jpg

http://minnesotamedical.com/minnesotamedical/images/74-15Km.jpg

http://www.pirate4x4.com/tech/billavista/Bender&Notcher/images/Bender/IMG_5642_resize.JPG

System Benchmark Table

Exhisting Tiller Bench Current Gold Metal Seat Adjustable Automotive Racing Seat

Allows Easy transfer of quadreplegic person from side to side of boat No Yes No

Seat is adjustable for comfort (different body types in chair) No No Yes

Requires no modification to boat No Yes Possible non modification interface

System allows quadreplegic person to steer boat No Yes Possible with adaption to current system

Photos from:

https://edge.rit.edu/edge/P12031/public/Planning%20%26%20Execution

https://edge.rit.edu/edge/R13031/public/Sonar%20Photos

http://www.wesellcarparts.com/store/ProdImages/megan/meganseatred.gif

http://www.recaro-automotive.com/us/product-areas/aftermarket-seats/product/expert.html

Concept 1:

Goals: Schematic:

Description:

Pros:

Cons:

Concept 2:

2) By starting with the track based system that Richard uses he will be able to give the team first hand

knowledge.

1) By building on the current system, the team will be more likely to have a successful project

1) By starting with an existing system, the team may have a good idea for a completely new system

that is not track based however if they are told to use the old system this idea may be lost.

Develop a completely new system that is of a trackless design. It would most

likely use a pre-manufactured seat

Potential Concept Solutions

Purchased Adjustable seat attached to a newly designed adjustable frame track

based system that is similar to the existing system.

The goal of this system is to use the existing seat as a

jumping off point. The designs of the original system

will remain but adjustability in both the seat and the

mounting will be added.

This system will use a pre-manufactured seat that has features such as adjustable headrest, lumbar

support, thigh extension, adjustable side bolsters, adjustable seat bolsters. One such seat is:

http://www.recaro-automotive.com/us/product-areas/aftermarket-seats/product/expert.html, This

seat would be mounted to a newly designed seat mount that is adjustable for height and front to back

distance. The leg posts and hand crank system would be similar to the current system, however they

would now be adjustable. Could use current u shaped track or investigate a straight track.

Goals: Schematic:

Description:

Pros:

Cons: 1)There may be too much stress for one mounting location (the pedestal). Even if a frame and

pedestal can be proven to be feasible, there may not be enough strength in the mounting of this to

the boat for this system.

This system would achieve the same functions as the current project however instead of having a

track for the seat to ride on, it would be mounted on a center pedestal. I envision there being a

counter weight 180 degrees from the seat. The seat would most likely be a premanufacted adjustable

seat, but it doesn't have to be. The seat mount would have front to back, and up and down

adjustments. The leg posts and hand crank system would be similar to the current system, however

they would now be adjustable.

1) By developing a new design it gives the students free reign to design a better product.

2) By having one center mounting location, this system may be easier to implement to different boat

types than the current track based system.

likely use a pre-manufactured seat

The goal of this system is to not use the track system

of the old project. Instead it is to use a only pedestal

mount for the seat.

Concept Seat Mount/Frame

Goals:

Pros:

Cons:

Potential Concept Solutions assuming Concept 1

2) System can be changed on the fly

1) All the adjustments add complexity for

the individuals installing the system.

2) adjustment systems add weight

Fully Adjustable track mount adapted from current design.

Adjustable Boat

Mount Concept 1

Fully adjustable system that has mounting for a bought seat that has

adjustability.

Description: Simular to current system

however there are provisions for all needed

adjustments. These are just some ideas.

Others could be implemented.

To take the existing system and build in

adjustability so that multiple users can use.

1) System can be adjusted to many

different users

Goals:

Pros:

Cons:

To have a system that allows mounting of

system in various boats without

modification to the boats.

Description: Similar to the current system

there is a plate that mounts the track to the

boat. The plate sits on the benches and

mounts to 4 hand grips. The hand grip

mounts are adjustable as they sit on a

track. Their bases also swivel and their

height is adjustable allowing adjustments

to be made in 3 axis's.

Fully Adjustable track mount adapted from current design. Mount Concept 1

1) No modifications to boat

2) This system would be quick to adjust

This system assumes that the boat has

hand holds.

Concept Seat Mount/Frame

Goals:

Pros:

Cons:

Potential Concept Solutions assuming Concept 1

Fully adjustable system that has mounting for the tiller strut. This is what

mounts the tiller so that the lines from the hand crank can control steering.

Be able to mount without modification in

various boats.

1) All the adjustments add complexity for

the individuals installing the system.

2) adjustment systems add weight, and if

pressure is used possible boat damage

Adjustable Boat

Mount Concept 1

Track mount adapted from current design for boats without hand grips. The

Catalina 22 is an example of a boat without handgrips.

1) Mounts in various boats

2) System would be easy to adjust

Description: The current system is bolted to

hand holds in sonar boats. These hand

holds are not present in new boats. This

system must either rely on pressure

mounts or an avaliable tie down etc. in the

mounting area. It is adjustable for width

and height.

Goals:

Pros:

Cons:

Mount Concept 1 Catalina 22 is an example of a boat without handgrips.

To have a system that allows mounting of

system in various boats without

modification to the boats.

Description: Similar to the current system

there is a plate that mounts the track to the

boat. The plate sits on the benches and

relies on pressure pushing on the sides of

the boat to hold in in place. This could be

accomplished by either a screw system or a

piston system.

This system risks damage to boats if too

much pressure is applied

1) No modifications to boat

2) This system would work on a boat with

or without hand holds

Engineering Analysis Further work:

Boat dimensions:

To overcome the issue of not being able to find measurements of other boats, a concept that did not

rely on specific hand hold locations was developed. This concept will still require general boat

dimensions to be obtained by the senior design team however it is much more forgiving than a system

that mounts to hand holds.

If this system does not work, it is possible that the team may have to drill and attach mounting brackets

to the boat. If this occurs an agreement between the team and the boat owner must be made. Also

research must be done on the proper way to seal the mounts. It is preferable that if the mounts must

be removed, a hand hold etc can be mounted in their place.

Feasibility of hand crank adjustment:

I chose to study a simple pined connection for this. I had first planned to download the previous team’s

cad files. Unfortunately they did not seem to be documented on their sight. The files were there from

the original design. I was able to get a crank height from these files. I then added roughly 3 inches to

this height and then I drew a rough proof of concept. The bottom beam is an extruded 3x3 square with

0.25” wall thickness. The inner beam is a 2.5x2.5 beam with .25’ wall thickness. The pin has a diameter

of 0.75”

My proof of concept is of a pinned connection. The pin was made out of A36 steel and both aluminum

extrusions were made from 6061 AL.

A loading scenario of 170lb applied at the top where the hand crank would be was applied.

Solidworks Simulation was used. The smallest standard mesh size was chosen and can be seen below:

Max Element Size 0.220341 in

Min Element Size 0.0734463 in

The following are screen prints from the FOS plots:

The important take away from this is that the factor of safety is never in the red or near 1 at any of the

holes or near the pin. The only place that it is at 1 is at the top which is to be expected as the force was

placed on the beam as an approximate location. In the real system this will be distributed through the

hand crank.

As the pin and surrounding area do not show a low FOS it can be concluded that this is a feasible way of

making the height of this system adjustable.

Shear Pin Analysis:

Feasibility of Track:

Last week I had identified that a 95 percentile mail of 255 pounds should be used.

This week I researched the weight of the proposed adjustable seat. It is 35.2 lb from:

http://www.recaro-automotive.com/us/product-areas/aftermarket-seats/product/expert.html

This gives a total estimated weight of 290.2 lb or 131.63 kg.

The previous team used 136 kg in their work. This leaves a difference of 4.4 kg.

It is safe to assume that the height and back and forth adjustment mechanisms will be under 4.4 kg or

roughly 9 lb.

The previous team did an extensive fea analysis.

For the seat hitting the stops at the end of the track the lowest fos was 1.659 at the hinge.

For the down and bow direction applied force of 1425 N and 25N respectively the factor of safety was

1.73, 2.67, 2.5 for various loading locations.

As these are all over 1 so the system can be said safe to use for a 95 percentile male.

It is important to note that Richard would be at the upper level of the safe usable person of this chair.

1

Appendix (PRP): Skills Checklist Project Name (tentative): Universal Gold Medal Seat

Checklist Completed by (name):

Evan Wozniak

For each discipline, indicate which skills or knowledge will be needed by students working on the associated project, and rank the skills in order of importance (1=highest priority). You may use the same number multiple times to indicate equal rank. Mechanical Engineering

1 3D CAD Aerodynamics

MATLAB programming CFD

2 Machining (basic) Biomaterials

1 Stress analysis (2D) Vibrations

1 Statics/dynamic analysis (2D) Combustion engines

Thermodynamics 3 GD&T (geometic dimensioning & tolerancing)

Fluid dynamics (CV) Linear controls

LabView (data acquisition, etc.) 3 Composites

Statistics 2 DFM

Robotics (motion control)

1 FEA Composites

Heat transfer Other:

Modeling of electromechanical & fluid systems Other:

Fatigue & static failure criteria (DME) Other:

Specifying machine elements

Reviewed by (ME faculty):

Industrial & Systems Engineering

Statistical analysis of data – regression Shop floor IE – methods, time study

1 Materials science Programming (C++)

2 Materials processing – machining lab

Facilities planning – layout, material handling DOE

Production systems design – lean, process improvement

Systems design – product/process design

1 Ergonomics – interface of people & equipment (procedures, training, maintenance)

Data analysis, data mining

Math modeling – linear programming), simulation Manufacturing engr.

1 Project management DFx -- Manuf., environment, sustainability

Engineering economy – ROI Other:

Quality tools – SPC Other:

Production control – scheduling Other:

Reviewed by (ISE faculty):

2

Electrical Engineering NA

Circuit design: AC/DC converters, regulators, amplifier ckts, analog filter design, FPGA Logic design, sensor bias/support circuitry

Digital filter design and implementation, DSP

Power systems: selection, analysis, power budget determination

Microcontroller selection/application

System analysis: frequency analysis (Fourier, Laplace), stability, PID controllers, modulation schemes, VCO’s & mixers, ADC selection

Wireless protocol, component selection

Circuit build, test, debug (scopes, DMM, function generators)

Antenna selection (simple design)

Board layout (some students) Communication system front end design

MATLAB (some proficiency) Algorithm design/simulation

PSpice Embedded software design/ implementation

Programming: C, Assembly (some proficiency) Other:

Electromagnetics (shielding, interference) Other:

Other:

Reviewed by (EE faculty):

Computer Engineering NA

Digital design (including HDL and FPGA) Wireless networks

Software for microcontrollers (including Linux and Windows)

Robotics (guidance, navigation, vision, machine learning, and control)

Device programming: Assembly language, C Concurrent and embedded software

Programming: Java, C++ Embedded and real-time systems

Analog design Digital image processing

Networking and network protocols Computer vision

Scientific computing (including C and MATLAB) Network security

Signal processing Other:

Interfacing transducers and actuators to microcontrollers

Other:

Other:

Reviewed by (CE faculty):