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POClass or Metaclass Design for Astrodynamics Engine
 

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  1. POClass or Metaclass Design for Astrodynamics Engine
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    <p>Gurus out there:</p> <p>The differential equations for modeling spacecraft motion can be described in terms of a collection of acceleration terms:</p> <pre><code>d2r/dt2 = a0 + a1 + a2 + ... + an </code></pre> <p>Normally a0 is the point mass acceleration due to a body (a0 = -mu * r/r^3); the "higher order" terms can be due to other planets, solar radiation pressure, thrust, etc.</p> <p>I'm implementing a collection of algorithms meant to work on this sort of system. I will start with Python for design and prototyping, then I will move on to C++ or Fortran 95.</p> <p>I want to design a class (or metaclass) which will allow me to specify the different acceleration terms for a given instance, something along the lines of:</p> <pre><code># please notice this is meant as "pseudo-code" def some_acceleration(t): return (1*t, 2*t, 3*t) def some_other_acceleration(t): return (4*t, 5*t, 6*t) S = Spacecraft() S.Acceleration += someacceleration + some_other_acceleration </code></pre> <p>In this case, the instance S would default to, say, two acceleration terms and I would add a the other two terms I want: <code>some acceleration</code> and <code>some_other_acceleration</code>; they return a vector (here represented as a triplet). Notice that in my "implementation" I've overloaded the <code>+</code> operator.</p> <p>This way the algorithms will be designed for an abstract "spacecraft" and all the actual force fields will be provided on a case-by-case basis, allowing me to work with simplified models, compare modeling methodologies, etc.</p> <p>How would you implement a class or metaclass for handling this? </p> <p>I apologize for the rather verbose and not clearly explained question, but it is a bit fuzzy in my brain.</p> <p>Thanks.</p>
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    1. CONot to knock Python, but there are environments specifically tailored to computation-heavy tasks like this. Matlab comes to mind. It's possible that some of what you want to do will come more naturally or easily there.
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      1. USCarl Smotricz
    2. CO@Carl: Python is for prototyping the solution before I move on to a more powerful, compiled language. If the logic and design work well in Python, I have done 80% of the work required to deploy an awesome application in C++. As for tailoring the solution for computation-heavy tasks, well, that's my job :)
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    3. CODepending on the tasks, a few benchmarks I performed show comparable performance in MATLAB & Python and both languages have similar capabilities (when you include numpy/scipy/matplotlib with Python). The only reason I would recommend someone switch from one to the other is MATLAB toolboxes specific to your field (to MATLAB) or price (to Python) - otherwise, I think prototyping in MATLAB/Python is perfect before optimizing... By the way, I assume that you found a solution since this is quite old?
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