1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Find acceleration component to hit target in 2D plane

  1. Jul 10, 2013 #1
    Hi. Me and my dad (math teacher) are having some trouble finding the answer to a seemingly fairly easy problem.

    It is somewhat similar to projectile trajectory math but with the difference that the projectile have an initial velocity and there's no gravity, only acceleration.

    Imagine the game Asteroids. The ship is floating at a certain velocity (x, y).
    The ship can accelerate in any direction to move. The acceleration force is constant.
    What I want is to find the acceleration component (or angle of acceleration vector) so that the ship will hit a defined target point (x, y).

    I can offset all positions and angles so that the ship is at position (0, 0) and the target is at (x, 0) to make calculation easier.
    One tricky part is that the ship has a maximum speed (magnitude of velocity component), but the initial velocity can be anything between 0 and maximum speed.

    I'd be really happy to see some solution for this, with or without maximum speed of the ship.

    Please ask if I'm unclear!

    Thanks
    Mattias
     
  2. jcsd
  3. Jul 10, 2013 #2

    A.T.

    User Avatar
    Science Advisor
    Gold Member

    I would transform the problem into the initial rest frame of the ship. But with acceleration, especially non constant acceleration (speed limit) there might be no analytical solution. If this is for a computer game, you can solve it numerically by iteration.
     
  4. Jul 10, 2013 #3

    hilbert2

    User Avatar
    Science Advisor
    Gold Member

    Under constant acceleration, an object always follows a parabolic trajectory. Just construct the parametric representation of a general parabolic trajectory that has the pre-defined initial position and velocity, and then solve which one of these parabolas goes through the target point.

    EDIT: if there's a speed limit, this does not work in all cases
     
    Last edited: Jul 10, 2013
  5. Jul 16, 2013 #4
    Thanks! Sorry for the late reply, the response notification ended up in my trash box.

    We came to the conclusion that I would have to solve a quartic equation (even without speed limit), and since it's not really one ship but thousands of particles updating at 60 fps I think I'll have to stick with my current pursuit curve like method.

    I'll check out the parabolic trajectory suggestion first though. :)

    cheers
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Find acceleration component to hit target in 2D plane
Loading...