Units (mass & force) - Grasshopper2024-03-29T09:53:35Zhttps://www.grasshopper3d.com/forum/topics/units-mass-force?groupUrl=kangaroo&commentId=2985220%3AComment%3A1783844&x=1&feed=yes&xn_auth=noThanks for the quick reply Da…tag:www.grasshopper3d.com,2017-12-05:2985220:Comment:18629882017-12-05T17:33:14.591Zzooidhttps://www.grasshopper3d.com/profile/IvelinPeychev
<p>Thanks for the quick reply Daniel,</p>
<p></p>
<p>I see, so I wasn't missing anything, what I was doing is just multiply the gravitational acceleration (the z vector) by the supposed mass (in kg) of the object.</p>
<p></p>
<p>I have other questions as well concerning the project I am doing but I'll open another thread for that.</p>
<p>Thanks for the quick reply Daniel,</p>
<p></p>
<p>I see, so I wasn't missing anything, what I was doing is just multiply the gravitational acceleration (the z vector) by the supposed mass (in kg) of the object.</p>
<p></p>
<p>I have other questions as well concerning the project I am doing but I'll open another thread for that.</p> Hi Zooid,
The unary force is…tag:www.grasshopper3d.com,2017-12-05:2985220:Comment:18629852017-12-05T17:24:19.138ZDaniel Pikerhttps://www.grasshopper3d.com/profile/DanielPiker
<p>Hi Zooid,</p>
<p></p>
<p>The unary force is simply the force applied - so it is not dependent on the mass. If you want to apply a load proportional to the mass of an object you need to apply this multiplier (this could be based on the volume of the object multiplied by a known density of the material) before feeding the resulting vector into the Unary component.</p>
<p>Hi Zooid,</p>
<p></p>
<p>The unary force is simply the force applied - so it is not dependent on the mass. If you want to apply a load proportional to the mass of an object you need to apply this multiplier (this could be based on the volume of the object multiplied by a known density of the material) before feeding the resulting vector into the Unary component.</p> Hello Daniel,
First: Awesome…tag:www.grasshopper3d.com,2017-12-05:2985220:Comment:18630792017-12-05T15:57:02.557Zzooidhttps://www.grasshopper3d.com/profile/IvelinPeychev
<p>Hello Daniel,</p>
<p></p>
<p>First: Awesome job, keep it up, I'm in the business of CAD software and I can tell you, your tool is high above the others.</p>
<p></p>
<p>Now on the topic:</p>
<p>I am a fairly new user of grasshopper overall, Kangaroo as well. What I cannot comprehend is how exactly does the Unary Force work. Let's simplify you apply a force on a point, but that needs a Mass component, right? F=m.a, you have the "a" by the vector and it's factor, but where's the mass? Is it…</p>
<p>Hello Daniel,</p>
<p></p>
<p>First: Awesome job, keep it up, I'm in the business of CAD software and I can tell you, your tool is high above the others.</p>
<p></p>
<p>Now on the topic:</p>
<p>I am a fairly new user of grasshopper overall, Kangaroo as well. What I cannot comprehend is how exactly does the Unary Force work. Let's simplify you apply a force on a point, but that needs a Mass component, right? F=m.a, you have the "a" by the vector and it's factor, but where's the mass? Is it related somehow to the dimensions of the object (RigidBody)? How can I change it, is there a definition of a Material (structural not graphical) and specific density? Maybe I'm missing a user component, I don't know.</p>
<p></p>
<p>Could you also suggest a grasshopper plugin or algorithm to make kangaroo simulation run realisticly time with respect to iterations?</p>
<p></p>
<p>Consider a Free Fall of different objects for example. Although, mass isn't important in that particular case, but time is.</p>
<p></p>
<p>Thank you in advance.</p> Dear Daniel,
Thank you for th…tag:www.grasshopper3d.com,2017-07-14:2985220:Comment:17838442017-07-14T11:32:09.516ZMarchttps://www.grasshopper3d.com/profile/Marc614
<p>Dear Daniel,</p>
<p>Thank you for these precision.</p>
<p>Do you know what is expected for BendStrength in Bend component ?</p>
<p>I've put E*I but the result is not corresponding to the reality ?</p>
<p></p>
<p>Thanks in advance</p>
<p>Dear Daniel,</p>
<p>Thank you for these precision.</p>
<p>Do you know what is expected for BendStrength in Bend component ?</p>
<p>I've put E*I but the result is not corresponding to the reality ?</p>
<p></p>
<p>Thanks in advance</p> Hello,
I have made a Layout f…tag:www.grasshopper3d.com,2017-01-21:2985220:Comment:16759762017-01-21T17:40:01.705ZJiříhttps://www.grasshopper3d.com/profile/Jiri
<p><span lang="EN-US" xml:lang="EN-US">Hello,</span></p>
<p><span lang="EN-US" xml:lang="EN-US">I have made a Layout file for using Kangaroo 0.099 and Kangaroo 2.1.4 with real units.</span></p>
<p><span lang="EN-US" xml:lang="EN-US">I get reliable solution for both of them. </span></p>
<p><span lang="EN-US" xml:lang="EN-US">If is it correct, It´s free for sharing.</span></p>
<p><span lang="EN-US" xml:lang="EN-US"> </span></p>
<p><span lang="EN-US" xml:lang="EN-US">I got one question. If you…</span></p>
<p><span lang="EN-US" xml:lang="EN-US">Hello,</span></p>
<p><span lang="EN-US" xml:lang="EN-US">I have made a Layout file for using Kangaroo 0.099 and Kangaroo 2.1.4 with real units.</span></p>
<p><span lang="EN-US" xml:lang="EN-US">I get reliable solution for both of them. </span></p>
<p><span lang="EN-US" xml:lang="EN-US">If is it correct, It´s free for sharing.</span></p>
<p><span lang="EN-US" xml:lang="EN-US"> </span></p>
<p><span lang="EN-US" xml:lang="EN-US">I got one question. If you want the geometry structurally consider like a shell, how you calculate the cross section for the <u>A</u>? For example: Thickness of Concrete shell is 4cm, can you use for your cross section 0,040m2 ? For Stiffness: 0,040*E/L ?</span></p>
<p><span lang="EN-US" xml:lang="EN-US">Thank you.</span><a href="http://storage.ning.com/topology/rest/1.0/file/get/2769236543?profile=original" target="_self"><img width="721" src="http://storage.ning.com/topology/rest/1.0/file/get/2769236543?profile=RESIZE_1024x1024" width="721" class="align-full"/></a></p> Hello, Daniel,
Could you, pl…tag:www.grasshopper3d.com,2015-06-11:2985220:Comment:13074232015-06-11T08:17:43.775ZELENA CHIRIDNIKhttps://www.grasshopper3d.com/profile/ELENACHIRIDNIK
<p>Hello, Daniel,</p>
<p></p>
<p>Could you, please, add to what is said above how are the shell strength (or hinge strength) and bend strength calculated in Kangaroo 099, and Strength in "Angle" and "Rigid body" components in Kangaroo 2?</p>
<p></p>
<p>Best,</p>
<p>Elena.</p>
<p>Hello, Daniel,</p>
<p></p>
<p>Could you, please, add to what is said above how are the shell strength (or hinge strength) and bend strength calculated in Kangaroo 099, and Strength in "Angle" and "Rigid body" components in Kangaroo 2?</p>
<p></p>
<p>Best,</p>
<p>Elena.</p> For those using non-metric, A…tag:www.grasshopper3d.com,2012-12-03:2985220:Comment:7407402012-12-03T20:55:16.795ZMichael Robertshttps://www.grasshopper3d.com/profile/MichaelRoberts
<p>For those using non-metric, Alternate units seem to work as ft for length, force, kips, Area (ft^2). Or, use # instead of kips: Depend on E, G, etc. ;)</p>
<p>As long as you are consistant with the units throughout, it should all add up.</p>
<p>Also, increase of the particle mass does help the system converge when stiffness values get larger.</p>
<p>I though that additional mass particle meant more load in the model, but no, only inertial.</p>
<p>Very Cool Work DP!</p>
<p>For those using non-metric, Alternate units seem to work as ft for length, force, kips, Area (ft^2). Or, use # instead of kips: Depend on E, G, etc. ;)</p>
<p>As long as you are consistant with the units throughout, it should all add up.</p>
<p>Also, increase of the particle mass does help the system converge when stiffness values get larger.</p>
<p>I though that additional mass particle meant more load in the model, but no, only inertial.</p>
<p>Very Cool Work DP!</p> When we are using meter for l…tag:www.grasshopper3d.com,2012-11-26:2985220:Comment:7357352012-11-26T20:26:41.706ZM NICKhttps://www.grasshopper3d.com/profile/MNICK
<p>When we are using meter for length, E is in Pa or GPa?</p>
<p>For example E for Steel= 200 GPa, if A=0.2 m2 and L=1 m, K= (200 x 10^9 x 0.2) / 1 Does it make sense?!!!</p>
<p>When we are using meter for length, E is in Pa or GPa?</p>
<p>For example E for Steel= 200 GPa, if A=0.2 m2 and L=1 m, K= (200 x 10^9 x 0.2) / 1 Does it make sense?!!!</p> Thanks!
That's brilliant, tha…tag:www.grasshopper3d.com,2012-11-01:2985220:Comment:7176532012-11-01T23:21:44.956ZRupert Toddhttps://www.grasshopper3d.com/profile/RupertTodd671
<p>Thanks!</p>
<p><br/>That's brilliant, thanks Daniel, really appreciate it, time to dig out my old tables of moduli! As a more general side note, Kangaroo is ace, cheers for that also!</p>
<p></p>
<p>All the best!</p>
<p></p>
<p>Rup</p>
<p>Thanks!</p>
<p><br/>That's brilliant, thanks Daniel, really appreciate it, time to dig out my old tables of moduli! As a more general side note, Kangaroo is ace, cheers for that also!</p>
<p></p>
<p>All the best!</p>
<p></p>
<p>Rup</p> Not so! - See my answer below…tag:www.grasshopper3d.com,2012-11-01:2985220:Comment:7175902012-11-01T22:57:45.033ZDaniel Pikerhttps://www.grasshopper3d.com/profile/DanielPiker
<p>Not so! - See my answer below. I've just never gotten around to writing them up until now!</p>
<p>Not so! - See my answer below. I've just never gotten around to writing them up until now!</p>