Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 26
  1. #1
    meh
    Join Date
    Jun 2006
    Location
    MSP
    My Bikes
    Rush Hour
    Posts
    193
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Engineering optimization project, need ideas

    I am completing my final semester as a Mechanical Engineering student, and need a few ideas.

    One of my final projects is the optimization of a mechanical system of my choice. I will be using CAD and finite element analysis software to complete stress analysis of a system.

    Basically I am looking for cycling-related topics that I could investigate. I had a couple thoughts, but am looking for other ideas.

    -Shaving weight off an existing crankset with machining processes (from an end mill for example), yet still retaining adequate strength and stiffness. Make your Sora cranks as light as 105 or Ultegra.

    -Different style cantilever brakes. Something like an old-school canti with more stopping power.

    Anyone have suggestions? It's a real open ended project; I just need to find some area of a component that needs improvement, then provide suggestions based on my computer simulations.

  2. #2
    Senior Member
    Join Date
    May 2007
    Location
    Pennsylvania
    My Bikes
    Basso, Tommaso, Ibex, Schwinn, SWOBO, Trek
    Posts
    1,930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I am a mechanical design engineer with a love of bicycles and their properties.
    Consider exploring a low profile behind the fork braking system.
    Belt drive drivetrain system.
    Optimized hydraulic shifting with electronic signaling.
    Composite/Ti exotic material disc brakes. Ceramic disk.

    I have designed unique frame designs, wheels, suspension systems which utilize an arched cylindrical elastomer system. Way Cool!
    Designs which replaces the "triangle" frame approach usually seen in today's bikes.

    Keep in mind bike usage. i.e. Road bikes need weight savings. MTB's need ruggedness, etc.

    Good Luck!

    SolidWorks Rocks

  3. #3
    No Rocket Surgeon eubi's Avatar
    Join Date
    Jan 2005
    Location
    Corona and S. El Monte, CA
    My Bikes
    Cannondale D600, Dahon Speed T7
    Posts
    1,648
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm a mechanical engineer. Congratulations on your last year in college!

    You picked a tough one dubstylee...bikes have a loooong history of optimization!

    I did work for a while on redsigning the cranks based on shear center. As you recall, this is where you can load a non-symmetrical beam off axis, but incurr only bending stresses, and no torsion. This is perfect for the loading of a crank.

    But in the end, you have a crash or something, and all your optimization goes out the window.

    I kind of have to laugh at some fo the "aero" components too. Compared to my fat @$$, there's not much I can do to get any aero advantage by changing components!

    Except for very specialized applications, you have to design the bike so it will stand up to all stresses it could possibly see. That includes touring loads, off-road shock loads, crashes, vibration, you get the picture.

    For example, in my work, I have to design valves that may see very high shock loads (read: explosions). The shock requirements drive the whole design. If it will not fail in shock, then I'm not too concerned about pressure, fatigue, etc.

    I do enjoy my folding bike, but I'm actually beyond the upper recommended weight limit. How about a smaller fold, and higher weight capacity?

    Besides cycling, engineering design and stress analysis is my life. I've been doing it for about 26 years now. If you have any questions, ask me and I'm sure it's something I have forgotten !

    Seriously, feel free to PM me and I'll help if I can.
    Last edited by eubi; 10-18-07 at 06:44 AM.
    Fewer Cars, more handlebars!

  4. #4
    meh
    Join Date
    Jun 2006
    Location
    MSP
    My Bikes
    Rush Hour
    Posts
    193
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the replies guys. Good to have some experienced engineers on here!

    I will keep you posted on what I decide to do.

  5. #5
    Senior Member
    Join Date
    Feb 2001
    Location
    England
    Posts
    12,073
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    If you want something simple, try a front fork-crown lamp mount that doesnt crack-n-fail.

  6. #6
    Senior Member Jarery's Avatar
    Join Date
    Jun 2005
    Location
    Coquitlam
    Posts
    2,538
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Im an engineering manager
    All you engineers posting, GET BACK TO WORK SLACKERS !
    Jarery

    -If you cant see it from space, its not a real hill
    -If two bikes are going in the same direction, ITS A RACE!

  7. #7
    Long Distance Cyclist Machka's Avatar
    Join Date
    Jan 2003
    Location
    I ride where the thylacine roamed!
    My Bikes
    Lots
    Posts
    36,670
    Mentioned
    13 Post(s)
    Tagged
    0 Thread(s)
    I'm an Engineering Technologist.

    Which CAD system?

  8. #8
    Uber Goober StephenH's Avatar
    Join Date
    Sep 2007
    Location
    Dallas area, Texas
    Posts
    10,304
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    There are different arrangements of spokes in wheels. So which is best? That should be a nice little optimization problem for you.

  9. #9
    Uber Goober StephenH's Avatar
    Join Date
    Sep 2007
    Location
    Dallas area, Texas
    Posts
    10,304
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Another idea. An observation on my now-gone $100 mountain bike- the brakes can be set up where you have lots of force but little movement or lots of movement (and therefore clearance) but little force. How bout a non-linear system where say, the first 1/4 of lever travel does 3/4 of the motion to pull the brake up against the wheel and leverage then shifts for maximum braking power?

  10. #10
    Senior Member Jarery's Avatar
    Join Date
    Jun 2005
    Location
    Coquitlam
    Posts
    2,538
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Machka View Post
    I'm an Engineering Technologist.

    Which CAD system?
    If anyone knows solidworks, and needs a new job.....pm me
    Jarery

    -If you cant see it from space, its not a real hill
    -If two bikes are going in the same direction, ITS A RACE!

  11. #11
    njm
    njm is offline
    Senior Member
    Join Date
    Aug 2007
    Location
    Cambridge, Mass.
    Posts
    311
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by StephenH View Post
    Another idea. An observation on my now-gone $100 mountain bike- the brakes can be set up where you have lots of force but little movement or lots of movement (and therefore clearance) but little force. How bout a non-linear system where say, the first 1/4 of lever travel does 3/4 of the motion to pull the brake up against the wheel and leverage then shifts for maximum braking power?
    I think this is a great idea!, and I bet it can be done with geometric considerations/design inside the brake lever. It would make it much easier for people to keep brakes with strong stopping power on wheels that aren't true and therefore need extra clearance. Bravo to StephenH!

    I could have used something like this on my Raleigh Record's 30-year-old steel wheels.

    Oh, and I suppose I should admit, I'm an engineer, too.

  12. #12
    Long Distance Cyclist Machka's Avatar
    Join Date
    Jan 2003
    Location
    I ride where the thylacine roamed!
    My Bikes
    Lots
    Posts
    36,670
    Mentioned
    13 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jarery View Post
    If anyone knows solidworks, and needs a new job.....pm me
    I worked with AutoCad way back when ... it's probably a completely different program now.

    Then I moved into Unigraphics and Intergraph on a UNIX (?) system.

    Then I moved into Solid Edge, which is also a Unigraphics product, I believe, but is much more user friendly. I have several certificates for the Solid Edge training I've had, but unfortunately I haven't used it in a few years ... my life has kind of taken a different turn. However, I've still got all the manuals etc.

    I could be mistaken but believe Solid Works is sort of a distance cousin of Solid Edge ... or at least has some similarities to it.

  13. #13
    meh
    Join Date
    Jun 2006
    Location
    MSP
    My Bikes
    Rush Hour
    Posts
    193
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by StephenH View Post
    There are different arrangements of spokes in wheels. So which is best? That should be a nice little optimization problem for you.

    I was thinking of going with this. After speaking with my prof, the he emphasized that it should be a relatively simple problem seeing as I only have a few weeks to complete it.

    I am thinking of comparing combinations of lacing patterns, rider weight, and spoke material/diameter.

  14. #14
    meh
    Join Date
    Jun 2006
    Location
    MSP
    My Bikes
    Rush Hour
    Posts
    193
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I will be using Pro/ENGINEER for CAD and Mechanica for any finite element analysis.

    Other calculations will be crunched out with some combination of Excel, EES, and Mathcad.

  15. #15
    Senior Member
    Join Date
    May 2007
    Location
    Pennsylvania
    My Bikes
    Basso, Tommaso, Ibex, Schwinn, SWOBO, Trek
    Posts
    1,930
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jarery View Post
    If anyone knows solidworks, and needs a new job.....pm me
    I use Solidworks all the time for part and product design.

  16. #16
    Senior Member DannoXYZ's Avatar
    Join Date
    Jul 2005
    Location
    Saratoga, CA
    Posts
    11,496
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by StephenH View Post
    Another idea. An observation on my now-gone $100 mountain bike- the brakes can be set up where you have lots of force but little movement or lots of movement (and therefore clearance) but little force. How bout a non-linear system where say, the first 1/4 of lever travel does 3/4 of the motion to pull the brake up against the wheel and leverage then shifts for maximum braking power?
    Odyssey used to make a roller-cam/pulley that varied the leverage & pull ratios. That function has now been incorporated into a lot of levers on the market.

  17. #17
    Senior Member Keith99's Avatar
    Join Date
    Apr 2005
    Posts
    5,605
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Cycling related right?

    How about child carriers or those bolt ons that turn your regular bike into a psuedo tandem with the kid.

    I'll bet those have not been quite as fine tuned as a lot of other things.

  18. #18
    Senior Member Jarery's Avatar
    Join Date
    Jun 2005
    Location
    Coquitlam
    Posts
    2,538
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Machka View Post
    I worked with AutoCad way back when ... it's probably a completely different program now.

    I could be mistaken but believe Solid Works is sort of a distance cousin of Solid Edge ... or at least has some similarities to it.
    Autocad is still a similar program, fancier ui to it now. Still has an extremely large user base.

    Solid edge i've seen a few years back but never used. At that time it was lagging behind solidworks. Of course today things could be totally different. We chose solidworks a couple years ago, and im not changing again for a long time

    To the OP, let us know what you finally decide on
    Jarery

    -If you cant see it from space, its not a real hill
    -If two bikes are going in the same direction, ITS A RACE!

  19. #19
    njm
    njm is offline
    Senior Member
    Join Date
    Aug 2007
    Location
    Cambridge, Mass.
    Posts
    311
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jarery View Post
    To the OP, let us know what you finally decide on
    And make sure to post some sweet 3-D figures with highest stresses in bright red...

  20. #20
    Senior Member
    Join Date
    Sep 2001
    Location
    Montreal
    My Bikes
    Peugeot Hybrid, Minelli Hybrid
    Posts
    6,521
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Design a step through frame that achieves some rigidity by putting the bottom frame member level with the bottom of the chainring and the top tube level with the top of the chainring. Also allowing enough horizontal distance for the foot to pass over the chainring without being obstructed by the top tube or seat tube.

  21. #21
    CRIKEY!!!!!!! Cyclaholic's Avatar
    Join Date
    May 2005
    Location
    Sydney, Australia
    My Bikes
    several
    Posts
    4,193
    Mentioned
    4 Post(s)
    Tagged
    0 Thread(s)
    Just trying to think outside the box here.... Most/all parts of a bicycle have been analysed to death by the manufacturers. Why not focus your work on perhaps analysing a cargo trailer hitch?

    If you're really keen why not analyse the entire trailer chassis, not just the hitch. Maybe try to incorporate suspension (for on road use) to improve handling?

  22. #22
    cab horn
    Join Date
    Jun 2004
    Location
    Toronto
    My Bikes
    1987 Bianchi Campione
    Posts
    28,298
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dubstylee View Post
    I was thinking of going with this. After speaking with my prof, the he emphasized that it should be a relatively simple problem seeing as I only have a few weeks to complete it.

    I am thinking of comparing combinations of lacing patterns, rider weight, and spoke material/diameter.
    This is better than reinventing the wheel in a few weeks. How doing a comparision on wheel strength, repeating jobst brandts study on spoke tying efficiency.

    Wheel strength, stiffness, different spokes, different rims, differing spoke tension ... the effect of a broken spoke given varying rider weight. There's a billion permutations here.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  23. #23
    Elmira>Taiwan>Elmira flatlander_48's Avatar
    Join Date
    Oct 2004
    Location
    Elmira, NY
    My Bikes
    2005 Ritchey BreakAway (full Chorus 11), 2001 Gary Fisher Tassajara mountain bike (sold), 2004 Giant TRC 2 road bike (sold)
    Posts
    1,246
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dubstylee View Post
    I am completing my final semester as a Mechanical Engineering student, and need a few ideas.

    One of my final projects is the optimization of a mechanical system of my choice. I will be using CAD and finite element analysis software to complete stress analysis of a system.

    Basically I am looking for cycling-related topics that I could investigate. I had a couple thoughts, but am looking for other ideas.

    -Shaving weight off an existing crankset with machining processes (from an end mill for example), yet still retaining adequate strength and stiffness. Make your Sora cranks as light as 105 or Ultegra.

    -Different style cantilever brakes. Something like an old-school canti with more stopping power.

    Anyone have suggestions? It's a real open ended project; I just need to find some area of a component that needs improvement, then provide suggestions based on my computer simulations.
    Me too. BSME 1972, U of Toledo

    How about:
    • 2 passenger Pedal Powered Vehicle with maximum efficiency
    • Seat with user-adjustable contours
    • If you didn't have to use a standard Bottom Bracket Shell, what would an efficient Bottom bracket look like?
    2005 Ritchey BreakAway (steel)
    Full Campagnolo double compact drivetrain - Chorus 11sp
    (50, 34 & 12-29)
    Proton wheels
    Cateye CC-TR300TW V3
    Ritchey fork, stem, headset, bars and seatpost
    Fizik Gobi saddle and bar tape
    BeBop Pedals

  24. #24
    Elmira>Taiwan>Elmira flatlander_48's Avatar
    Join Date
    Oct 2004
    Location
    Elmira, NY
    My Bikes
    2005 Ritchey BreakAway (full Chorus 11), 2001 Gary Fisher Tassajara mountain bike (sold), 2004 Giant TRC 2 road bike (sold)
    Posts
    1,246
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Jarery View Post
    If anyone knows solidworks, and needs a new job.....pm me
    Sorry. Too far, too cold...

    I finish a training course on SolidWorks in 2 days, after using it on my own for about 6 months. Nice to have some of the blanks filled in by actually being trained!
    2005 Ritchey BreakAway (steel)
    Full Campagnolo double compact drivetrain - Chorus 11sp
    (50, 34 & 12-29)
    Proton wheels
    Cateye CC-TR300TW V3
    Ritchey fork, stem, headset, bars and seatpost
    Fizik Gobi saddle and bar tape
    BeBop Pedals

  25. #25
    Senior Member Jarery's Avatar
    Join Date
    Jun 2005
    Location
    Coquitlam
    Posts
    2,538
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by flatlander_48 View Post
    Sorry. Too far, too cold...
    Too Cold?

    I can cycle every day of the year on slicks without studs...dont need a balaklava...and only have a couple days a year a below freezing.......try that in New York
    Jarery

    -If you cant see it from space, its not a real hill
    -If two bikes are going in the same direction, ITS A RACE!

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •