http://nassp.space/index.php?action=history&feed=atom&title=Body_Mounted_Attitude_Gyro 2026-04-21T05:27:50Z Revision history for this page on the wiki MediaWiki 1.40.1 http://nassp.space/index.php?title=Body_Mounted_Attitude_Gyro&diff=520&oldid=prev 2011-01-21T21:45:07Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 21:45, 21 January 2011</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Simply put, </del>Body Mounted Attitude Gyros <del style="font-weight: bold; text-decoration: none;">(</del>BMAGs<del style="font-weight: bold; text-decoration: none;">) </del>are rate <del style="font-weight: bold; text-decoration: none;">gyros mounted in a fixed reference </del>to the spacecraft <del style="font-weight: bold; text-decoration: none;">itself</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> The </ins>Body Mounted Attitude Gyros<ins style="font-weight: bold; text-decoration: none;">, or </ins>BMAGs<ins style="font-weight: bold; text-decoration: none;">, help to back up to the IMU. The two assemblies </ins>are <ins style="font-weight: bold; text-decoration: none;">capable of detecting the spacecraft's </ins>rate<ins style="font-weight: bold; text-decoration: none;">. This information is sent </ins>to the <ins style="font-weight: bold; text-decoration: none;">Gyro Display Coupler, or GDC, which adds the rate to its current know attitude, updating its knowledge </ins>spacecraft<ins style="font-weight: bold; text-decoration: none;">'s orientation. There are two sets of rate gyros that are referred to as BMAGs one and two. Both of these can be activated or powered off through their rotary switches on MDC-7</ins>.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">As a backup to </del>the <del style="font-weight: bold; text-decoration: none;">complex IMU, the Apollo CSM engineers decided to use </del>rate <del style="font-weight: bold; text-decoration: none;">gyros, much like those in the IMU, and mount them </del>to the <del style="font-weight: bold; text-decoration: none;">spacecraft directly</del>. <del style="font-weight: bold; text-decoration: none;">These </del>gyros <del style="font-weight: bold; text-decoration: none;">can then give </del>the rate <del style="font-weight: bold; text-decoration: none;">of angular change referenced </del>to the <del style="font-weight: bold; text-decoration: none;">spacecraft instead of inertial space.</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> Both gyro assemblies are typically caged and determine only </ins>the <ins style="font-weight: bold; text-decoration: none;">spacecraft's rate. The </ins>rate <ins style="font-weight: bold; text-decoration: none;">is then sent </ins>to the <ins style="font-weight: bold; text-decoration: none;">GDC</ins>. <ins style="font-weight: bold; text-decoration: none;">The three BMAG switches on MDC-1 determine which set of </ins>gyros the <ins style="font-weight: bold; text-decoration: none;">GDC receives </ins>rate <ins style="font-weight: bold; text-decoration: none;">data from. Setting a switch </ins>to <ins style="font-weight: bold; text-decoration: none;">either Rate 1 or Rate 2 determines which BMAG </ins>the <ins style="font-weight: bold; text-decoration: none;">GDC receives rate from </ins>in <ins style="font-weight: bold; text-decoration: none;">that axis</ins>. <ins style="font-weight: bold; text-decoration: none;">BMAG one </ins>is <ins style="font-weight: bold; text-decoration: none;">capable of being uncaged </ins>to <ins style="font-weight: bold; text-decoration: none;">determine </ins>attitude <ins style="font-weight: bold; text-decoration: none;">errors</ins>. The <ins style="font-weight: bold; text-decoration: none;">center setting of </ins>the <ins style="font-weight: bold; text-decoration: none;">BMAG switches, Att 1/Rate 2, tells </ins>the GDC <ins style="font-weight: bold; text-decoration: none;">to accept rate data from BMAG 2 </ins>and attitude <ins style="font-weight: bold; text-decoration: none;">data </ins>from <ins style="font-weight: bold; text-decoration: none;">BMAG 1</ins>. <ins style="font-weight: bold; text-decoration: none;">In order </ins>to <ins style="font-weight: bold; text-decoration: none;">do this</ins>, <ins style="font-weight: bold; text-decoration: none;">BMAG one must be uncaged by </ins>the <ins style="font-weight: bold; text-decoration: none;">ECA. This is done automatically </ins>when <ins style="font-weight: bold; text-decoration: none;">setting a BMAG switch </ins>to the <ins style="font-weight: bold; text-decoration: none;">center position</ins>.</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Maintaining attitude </del>in <del style="font-weight: bold; text-decoration: none;">space requires two separate functions</del>. <del style="font-weight: bold; text-decoration: none;">Remembering a reference attitude and knowing the rate at which the spacecraft </del>is <del style="font-weight: bold; text-decoration: none;">turning. By adding the angular rate </del>to <del style="font-weight: bold; text-decoration: none;">the remembered reference, the current spacecraft </del>attitude <del style="font-weight: bold; text-decoration: none;">can be calculated</del>.</div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The <del style="font-weight: bold; text-decoration: none;">BMAGs determine </del>the <del style="font-weight: bold; text-decoration: none;">angular rates and </del>the <del style="font-weight: bold; text-decoration: none;">Gyro Display Coupler (</del>GDC<del style="font-weight: bold; text-decoration: none;">) receives these angular rates </del>and <del style="font-weight: bold; text-decoration: none;">adds them to the current attitude, thus remembering the </del>attitude <del style="font-weight: bold; text-decoration: none;">difference </del>from <del style="font-weight: bold; text-decoration: none;">the original reference in real time</del>.</div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">This was a primitive, but reliable backup </del>to <del style="font-weight: bold; text-decoration: none;">the CMC for attitude reference</del>, <del style="font-weight: bold; text-decoration: none;">and allowed Apollo 12 to monitor </del>the <del style="font-weight: bold; text-decoration: none;">ascent </del>when <del style="font-weight: bold; text-decoration: none;">lightning caused the CMC </del>to <del style="font-weight: bold; text-decoration: none;">loose it's inertial reference during </del>the <del style="font-weight: bold; text-decoration: none;">boost phase of flight</del>.</div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Stabilization and Control System]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Stabilization and Control System]]</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Stub}}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Stub}}</div></td></tr> <!-- diff cache key NASSP_wiki:diff::1.12:old-519:rev-520 --> </table>

imported>Abr35 http://nassp.space/index.php?title=Body_Mounted_Attitude_Gyro&diff=519&oldid=prev 2007-03-23T13:33:04Z

<p>BMAG description</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:33, 23 March 2007</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Simply put, Body Mounted Attitude Gyros (BMAGs) are rate gyros mounted in a fixed reference to the spacecraft itself.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">As a backup to the complex IMU, the Apollo CSM engineers decided to use rate gyros, much like those in the IMU, and mount them to the spacecraft directly. These gyros can then give the rate of angular change referenced to the spacecraft instead of inertial space.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Maintaining attitude in space requires two separate functions. Remembering a reference attitude and knowing the rate at which the spacecraft is turning. By adding the angular rate to the remembered reference, the current spacecraft attitude can be calculated.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">The BMAGs determine the angular rates and the Gyro Display Coupler (GDC) receives these angular rates and adds them to the current attitude, thus remembering the attitude difference from the original reference in real time.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">This was a primitive, but reliable backup to the CMC for attitude reference, and allowed Apollo 12 to monitor the ascent when lightning caused the CMC to loose it's inertial reference during the boost phase of flight.</ins></div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Stabilization and Control System]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Stabilization and Control System]]</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Stub}}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Stub}}</div></td></tr> <!-- diff cache key NASSP_wiki:diff::1.12:old-518:rev-519 --> </table>

68.84.194.195 http://nassp.space/index.php?title=Body_Mounted_Attitude_Gyro&diff=518&oldid=prev 2007-01-27T14:25:04Z

<p>cat</p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:25, 27 January 2007</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Stabilization and Control System <del style="font-weight: bold; text-decoration: none;">(CSM)</del>]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[Category:Stabilization and Control System]]</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Stub}}</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{Stub}}</div></td></tr> <!-- diff cache key NASSP_wiki:diff::1.12:old-517:rev-518 --> </table>

imported>Tschachim http://nassp.space/index.php?title=Body_Mounted_Attitude_Gyro&diff=517&oldid=prev 2007-01-27T00:02:21Z

<p></p> <p><b>New page</b></p><div>[[Category:Stabilization and Control System (CSM)]]<br /> {{Stub}}</div>

imported>Tschachim