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Thread: A new free vehicle dynamics resource - Dan's Vehicle Dynamics Corner

  1. #11
    Hey Guys,

    Over the last couple of weeks I've been talking to a lot of my clients about tyre modelling and how they should go about it.

    Given the interest in tyre modelling in FSAE, you might find the following link interesting,

    http://www.chassissim.com/blog...illing-in-the-blanks

    I've referred you to the ChassisSim website because I've split the tutorials over 3 videos.

    Enjoy

    Danny Nowlan
    Director
    ChassisSim Technologies

  2. #12
    Is chassissim connected to carsim or suspensionsim by any chance?
    Kettering University Vehicle Dynamics
    Formula SAE 2010 - 2015
    Clean Snowmobile Powertrain 2012 - 2015

    Boogityland 2015 - Present

  3. #13
    MCoach,

    No my friend, ChassisSim has no connection with CarSim or SuspensionSim.

    Just to give everyone a quick history lesson, ChassisSim started it's life as my Aeronautical Engineering Masters in the mid '90s. I then went to Europe and worked in motorsport across a range of different formula and ChassisSim grew from there.

    It had it's start at university, but ChassisSim was forged at the race track.

    All the Best

    Danny Nowlan
    Director
    ChassisSim Technologies

  4. #14
    I thought ChassisSim was a quasi-steady lapsim - yet you have damper force characteristics impacting the lapsim. Is it some kind of transient sim with a path following driver controller/optimal control problem for minimum path time, or is it still quasi-steady with some correction factors of sorts for the impact of the dampers?

    Edit: I found with some more digging that it's in fact a transient sim. Out of curiosity, is it a path following driver controller, an optimal control problem for minimum path time, or something else? Or can you not tell me, haha?

    In one of your videos you said you had 17 state variables - I'm curious as to what the last 3 are after the 6 sprung DoF, 4 unsprung heave and 4 wheel rotations? Unless those are steering wheel angle, brake pedal force(or something like that) and throttle position?

  5. #15
    Hey Guys,

    Just one thing I want to clarify. The lap time simulation in ChassisSim is fully transient. There are no pseudo static calcs in there what so ever. It's what makes ChassisSim unique. You might find the following link useful,

    http://www.chassissim.com/blog...r-laptime-simulation

    Moop - Let me answer your questions one by one

    1) You specify a path for ChassisSim to follow. We went down this road because by the time the car's have hit the track and laid down rubber etc you pretty much have one racing line per category of car. I can tell you from experience I've done the other way and it will drive you mad for very little reward.

    2) In terms of the sates of the ChassisSim vehicle model these are,

    Forward Speed (Vx)
    Sideways Speed (Vy)
    Yaw rate (r)
    Sprung mass heave and heave velocity
    Sprung mass pitch angle and pitch angle velocity
    Sprung mass roll angle and roll angle velocity
    All 4 wheel displacements and velocity
    All 4 surface Tyre temps

    and watch this space
    All 4 internal tyre temps - but this is under development.

    Also guys while I'm on the topic let me pass on observation/word of advice. I know a lot of people on this forum like to play with advanced analysis etc. The key to using simulation properly is you start simple and then get detailed later. If you go the other way you'll spend months going no where.

    All the Best

    Danny Nowlan
    Director
    ChassisSim Technologies

  6. #16
    Guys,

    By the way I was actually going through the ChassisSim tutorials and found this,

    http://www.youtube.com/watch?v...index=9&feature=plcp

    It's about to how to classify wing and aero changes in ChassisSim. I show you some handy shortcuts to economise the number of aeromaps you need.

    I know strictly speaking in FSAE there are alot of cars out there that don't run a lot of downforce. That being said if you want to move on into motorsport you might find this helpful.

    Enjoy

    Danny Nowlan
    Director
    ChassisSim Technologies

  7. #17
    Guys,

    Just a quick clarification by motorsport I mean professional motorsport where you get paid to engineer and play with cars for a living and or where you need to adjust downforce! Sorry guys I hit the send button too soon!

    All the Best

    Danny Nowlan
    Director
    ChassisSim Technologies

  8. #18
    Hey Guys,

    This is the latest episode of Dan's Vehicle Dynamics corner. It's about slip angles, neutral steer and ackermann. I leave you with a challenge at the end.

    http://www.youtube.com/watch?v...DqA&feature=youtu.be

    Enjoy

    Danny Nowlan
    Director
    ChassisSim Technologies

  9. #19
    Hey Guys,

    I've seen some interesting stuff crop up in Racecar Engineering on tyre modelling/simulation.

    Not that I don't think many of you need this, but you might find the following interesting as a counter point,

    http://www.youtube.com/watch?v...index=1&feature=plcp

    Enjoy Guys

    Danny Nowlan
    Director
    ChassisSim Technologies

  10. #20
    Hey Guy's. I've been hearing some interesting stuff with regards to using simple parameters to simulate a race car. In particular lap time simulation. Have a look at this because I think this provides an interesting counter point,

    http://www.youtube.com/watch?v...Z-Q&feature=youtu.be

    Food for thought guys.

    Danny Nowlan
    Director
    ChassisSim Technologies

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