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	<title>Real-Time Physics Simulation Forum</title>
	
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	<updated>2018-09-12T16:14:22+00:00</updated>

	<author><name><![CDATA[Real-Time Physics Simulation Forum]]></name></author>
	<id>https://pybullet.org/Bullet/phpBB3/app.php/feed/topic/12437</id>

		<entry>
		<author><name><![CDATA[Erwin Coumans]]></name></author>
		<updated>2018-09-12T16:14:22+00:00</updated>

		<published>2018-09-12T16:14:22+00:00</published>
		<id>https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=41442#p41442</id>
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		<title type="html"><![CDATA[Re: Inverse Dynamics Algorithm]]></title>

		
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The computation of the joint space inertia (mass) <a href="https://github.com/erwincoumans/bullet3/blob/master/src/BulletInverseDynamics/details/MultiBodyTreeImpl.cpp#L615" class="postlink">matrix matrix </a> is using the Composite Rigid Body Algorithm.<blockquote class="uncited"><div>// The algorithm is essentially an implementation of "method 3"<br>// in "Efficient Dynamic Simulation of Robotic Mechanisms" (Walker and Orin, 1982)<br>// (Later named "Composite Rigid Body Algorithm" by Featherstone).</div></blockquote>The <a href="https://github.com/erwincoumans/bullet3/blob/master/src/BulletInverseDynamics/details/MultiBodyTreeImpl.cpp#L233" class="postlink">inverse dynamics calculation</a> uses the Recursive Newton-Euler Algorithm (RNEA), proposed for use in robotics by Walker and Paul in 1980 in "On-line computational scheme for mechanical manipulators"<p>Statistics: Posted by <a href="https://pybullet.org/Bullet/phpBB3/memberlist.php?mode=viewprofile&amp;u=2">Erwin Coumans</a> — Wed Sep 12, 2018 4:14 pm</p><hr />
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	</entry>
		<entry>
		<author><name><![CDATA[__michael__]]></name></author>
		<updated>2018-09-12T12:45:02+00:00</updated>

		<published>2018-09-12T12:45:02+00:00</published>
		<id>https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=41441#p41441</id>
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		<title type="html"><![CDATA[Inverse Dynamics Algorithm]]></title>

		
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What kind of algorithm is used for the inverse dynamics computation? Is there any citable source for the algorithm description?  <br><br>Thanks alot.<br>Michael<p>Statistics: Posted by <a href="https://pybullet.org/Bullet/phpBB3/memberlist.php?mode=viewprofile&amp;u=12392">__michael__</a> — Wed Sep 12, 2018 12:45 pm</p><hr />
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