Accurately modelling and solving for a pin? - Scan-and-Solve for Rhino2024-03-29T08:38:56Zhttp://www.scan-and-solve.com/forum/topics/accurately-modelling-and-solving-for-a-pin?commentId=6083097%3AComment%3A35575&x=1&feed=yes&xn_auth=noDear Michael,
Thanks - this i…tag:www.scan-and-solve.com,2012-08-27:6083097:Comment:355752012-08-27T17:50:03.892ZTom D.http://www.scan-and-solve.com/profile/TomD
<p>Dear Michael,</p>
<p>Thanks - this is food for thought. Although an approximation this approach may help to lessen the local impact of the over-specified restraints I am using now.</p>
<p>Tom</p>
<p>Dear Michael,</p>
<p>Thanks - this is food for thought. Although an approximation this approach may help to lessen the local impact of the over-specified restraints I am using now.</p>
<p>Tom</p> This post is inspired by anot…tag:www.scan-and-solve.com,2012-08-27:6083097:Comment:354652012-08-27T17:10:34.616ZMichael Freytaghttp://www.scan-and-solve.com/profile/MichaelFreytag
<p>This post is inspired by another question I received via email. The following approach to pin connections may be an option in some cases.</p>
<p><strong>Desired arrangement:</strong></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2506706061?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2506706061?profile=original" width="524"></img></a> <strong>Scan&Solve approximation:</strong><a href="http://storage.ning.com/topology/rest/1.0/file/get/2506706137?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2506706137?profile=original" width="649"></img></a> The cylindrical faces…</p>
<p>This post is inspired by another question I received via email. The following approach to pin connections may be an option in some cases.</p>
<p><strong>Desired arrangement:</strong></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2506706061?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2506706061?profile=original" width="524"/></a><strong>Scan&Solve approximation:</strong><a href="http://storage.ning.com/topology/rest/1.0/file/get/2506706137?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2506706137?profile=original" width="649"/></a>The cylindrical faces have been split into quadrants that are "mostly tangent" to the coordinate directions. This allows partial restraints to be assigned to these faces, allowing <strong>small</strong> rotations.</p>
<p>~Michael</p> Hello Michael,
Thank you for…tag:www.scan-and-solve.com,2012-08-24:6083097:Comment:353582012-08-24T18:09:52.818ZTom D.http://www.scan-and-solve.com/profile/TomD
<p>Hello Michael,</p>
<p></p>
<p>Thank you for your thoughts. Your approach should indeed lead to a better picture around the points in question.</p>
<p></p>
<p>Kind regards,</p>
<p></p>
<p>Tom D.</p>
<p>Hello Michael,</p>
<p></p>
<p>Thank you for your thoughts. Your approach should indeed lead to a better picture around the points in question.</p>
<p></p>
<p>Kind regards,</p>
<p></p>
<p>Tom D.</p> Hello Tom,
Can you do a hand…tag:www.scan-and-solve.com,2012-08-23:6083097:Comment:354532012-08-23T21:49:57.344ZMichael Freytaghttp://www.scan-and-solve.com/profile/MichaelFreytag
<p>Hello Tom,</p>
<p>Can you do a hand calculation to determine the reaction force at the pin where you are currently applying the restraint? Then apply your manually computed reaction force as a load on the appropriate faces of the interior of the pivot. For numerical stability, you will need a restraint somewhere. Can you put it at the opposite end of the link? Something like this: (your pivot represented by the middle hole)…</p>
<p></p>
<p>Hello Tom,</p>
<p>Can you do a hand calculation to determine the reaction force at the pin where you are currently applying the restraint? Then apply your manually computed reaction force as a load on the appropriate faces of the interior of the pivot. For numerical stability, you will need a restraint somewhere. Can you put it at the opposite end of the link? Something like this: (your pivot represented by the middle hole)</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2506700349?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2506700349?profile=original" width="592"/></a></p>
<p>This will move the restraint away from your region of interest and may give you a clearer picture of the stresses there.</p>
<p>~Michael</p> I posted this request perhaps…tag:www.scan-and-solve.com,2012-08-22:6083097:Comment:355572012-08-22T19:44:06.119ZTom D.http://www.scan-and-solve.com/profile/TomD
<p>I posted this request perhaps a little fast - I was looking for a resolution setting but hadn't found it. I have founded now, so I suspect I will be able to get smoother results by increasing the resolution.</p>
<p><br/>I am, however, still interested in ways to model the behavior of pin - i.e. no shear at the surface....</p>
<p></p>
<p>T.</p>
<p>I posted this request perhaps a little fast - I was looking for a resolution setting but hadn't found it. I have founded now, so I suspect I will be able to get smoother results by increasing the resolution.</p>
<p><br/>I am, however, still interested in ways to model the behavior of pin - i.e. no shear at the surface....</p>
<p></p>
<p>T.</p>