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Type: Posts; User: Adam Farabaugh

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  1. Replies
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    Even if the pushrod attachment is welded, you can...

    Even if the pushrod attachment is welded, you can point the line of action through some point (at some percentage of peak load given your expected geometry) to minimize moments.
    The hand...
  2. The frame of the pack appears to be made using...

    The frame of the pack appears to be made using 8020 extrusions. If you're using the standard 8020 fasteners then the only thing holding together the frame is friction. My advice is to replace any...
  3. There's so much room for activities! Are you...

    There's so much room for activities!

    Are you relying on friction to hold the frame together? If so, instant fail.
  4. Low alloy steel is low alloy steel, they all have...

    Low alloy steel is low alloy steel, they all have the same stiffness.

    What else do you need?
    There is an AISI 4130 specification that you could read.
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    Standard caveat that you should ask the rules...

    Standard caveat that you should ask the rules committee, however I did this many times and the phase lag between question and response is quite high, so here's some hints

    1) Correct - use AF load...
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    The easiest first-order solution is to at least...

    The easiest first-order solution is to at least make a pie chart of vehicle mass. How much do your current metal control arms weigh? How much will the CF ones weigh?
    Could you achieve the same...
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    Can you see the TSAL through the gap between...

    Can you see the TSAL through the gap between flaps or flap/main element?
  8. Use metal. You did creep calculations, but...

    Use metal.

    You did creep calculations, but did you consider vibration environments as well? Most fasteners will relax more than 4% of their preload much faster than that.
    Also, do a test if...
  9. Replies
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    This has been mentioned by a few people. Under...

    This has been mentioned by a few people.
    Under the current rules there is a tradeoff between track width (narrow = less weight, faster through slaloms) vs. aero plan area (more A = more downforce). ...
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    Try running a modal analysis with no boundary...

    Try running a modal analysis with no boundary conditions. There should be 6 free body modes with really low modal frequencies. Other low-frequency modes should show mechanisms.

    Also make sure...
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    14,548

    If you want to post code, I recommend...

    If you want to post code, I recommend pastebin.com or github.com. Pastebin is faster to do, github is less sketchy.
  12. Replies
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    Want to start off saying that I don't think the...

    Want to start off saying that I don't think the voltage limit is TOO debilitating. I don't think it ruins the EV competition in the US. That being said there are some limitations.

    1) Most...
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    Money is not the problem for the US EV teams. ...

    Money is not the problem for the US EV teams. The problem is kids don't know what the f*** they are doing. It has less to do with the powertrain and more to do with building shoddy 500+ lbm cars,...
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    This is not a solution to your problem, but for...

    This is not a solution to your problem, but for all the teams that use snap rings: how do you avoid slop in these joints? Do you shim each and every one of the bearings against the snap rings into...
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    The difference between "front hoop bracing" and...

    The difference between "front hoop bracing" and "front bulkhead support" is that "front bulkhead support" must be 1.25mm wall, 3 members back to the front hoop. "Front hoop bracing" on the other...
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    What about T3.6 do you not understand? First...

    What about T3.6 do you not understand?

    First thing is first, for any alternate tubing while using the T.xxx drivers cell rules, the intent is that, for every regulated tube, your tube has equal...
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    Sure it's not standard. But earlier you said you...

    Sure it's not standard. But earlier you said you drove 10 hours to the comp, and if you know how many kW your car puts out on a highway cruise, then it sure is useful!
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    [10 characters]

    [10 characters]
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    Just letting you know that we have tried and...

    Just letting you know that we have tried and failed to justify using lower voltage rating components inside the pack. You will have to find a 88V+ rated option.
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    I seriously doubt that you can get any...

    I seriously doubt that you can get any significant air mass flow through something like that... What kind of mass flow (or volume flow) are you looking to get?

    Why do you think you need to use a...
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    If 100 euro is too much for a sensor, how are you...

    If 100 euro is too much for a sensor, how are you building an electric car? That's less than 1% of the cost of the car surely.
    ...
  22. Replies
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    Not saying this is the way you should do it, but...

    Not saying this is the way you should do it, but we have never normalized. In fact before last year all of our frames were MIG welded, in house by students who never welded before. Needless to say...
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    While that's common in industry (have a look at...

    While that's common in industry (have a look at knuckles on a lot of cars and you see them dodging the rim/tire) it looks heavy and or floppy. Try this:

    http://imgur.com/TgUa0lw
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    Of course, since you're a first year team, the...

    Of course, since you're a first year team, the past to best success probably involves not doing any FEA at all and just building the thing. I'm not joking. You'd rather have a floppy car that runs...
  25. Replies
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    There are a lot of wrong ways to do analysis with...

    There are a lot of wrong ways to do analysis with the bearing races and the interface to the hub. EVERY method that has been mentioned so far is ONLY useful for relative comparisons between your...
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