{"id":389,"date":"2019-03-25T12:42:57","date_gmt":"2019-03-25T17:42:57","guid":{"rendered":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/?p=389"},"modified":"2019-03-25T12:44:25","modified_gmt":"2019-03-25T17:44:25","slug":"weekly-meeting-13-032519","status":"publish","type":"post","link":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/2019\/03\/weekly-meeting-13-032519\/","title":{"rendered":"Weekly Meeting 13 (3\/25\/19)"},"content":{"rendered":"<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">SNR<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Recalculated baseline without the co-contractions and this raised all of the values <\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Initial contraction classifier<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Recorded raw EMG, <\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Tested using:<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">pure extensor test<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">pure flexor test<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">partial extensor\/flexor<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Tustin approximation is working well<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Includes a discrete integral in the calculation allowing us to smooth as we go<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Helps with the flow and speed of the code<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Seeing good difference between muscles<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Calculated MAV at different contraction levels<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Can use either 3rd\/4th degree polynomial or piecewise function<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">3rd order is probably fine, but shouldn\u2019t go higher (maybe 4th order)<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The problem with higher degree polynomials is with the edge conditions due to curvature<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Need more data points (currently only taking average of a few)<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Currently using percent contraction as measurement<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Since we&#8217;re not using resistance, percent contraction is not the same as angle<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">To open a hand, ideally the prosthetic is set so it does not use maximum contraction<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Amputees could imagine moving to a certain angle<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">When collecting EMG signals, gravity will affect the amount of force needed, so we should have someone place their hand perpendicular to the table to eliminate gravity<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Servo to prosthetic<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Don\u2019t operate in exactly the same way<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">We want to use servo as a proof of concept<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Can demonstrate motion<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The PID would work well for the hand, but not as well for the servo<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Couldn\u2019t maintain angle with contraction using PID like we could in the hand<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Servo works based on mapping to position instead of motion<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">We will still code the PID, just comment it out when using the servo<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">The only part missing would be the actual connection to the prosthetic hand<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">We were thinking of making a MATLAB simulation to show how it would work when translated to the arm<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Could make a second software package that uses velocity control to control servo so we can demonstrate the change in controller function<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Ottobock arm<\/span>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Don\u2019t sent to Ottobock, just send back to Case after design day<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>SNR Recalculated baseline without the co-contractions and this raised all of the values Initial contraction classifier Recorded raw EMG, Tested using: pure extensor test pure flexor test partial extensor\/flexor Tustin approximation is working well Includes a discrete integral in the calculation allowing us to smooth as we go Helps with the flow and speed of&#8230;<\/p>\n","protected":false},"author":7954,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-389","post","type-post","status-publish","format-standard","hentry","category-notebook"],"_links":{"self":[{"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/posts\/389","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/users\/7954"}],"replies":[{"embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/comments?post=389"}],"version-history":[{"count":3,"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/posts\/389\/revisions"}],"predecessor-version":[{"id":393,"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/posts\/389\/revisions\/393"}],"wp:attachment":[{"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/media?parent=389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/categories?post=389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/forcebasedprosthesiscontroller\/wp-json\/wp\/v2\/tags?post=389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}