{"action":"opened","issue":{"url":"https://api.github.com/repos/tbeu/Modelica/issues/29","repository_url":"https://api.github.com/repos/tbeu/Modelica","labels_url":"https://api.github.com/repos/tbeu/Modelica/issues/29/labels{/name}","comments_url":"https://api.github.com/repos/tbeu/Modelica/issues/29/comments","events_url":"https://api.github.com/repos/tbeu/Modelica/issues/29/events","html_url":"https://github.com/tbeu/Modelica/issues/29","id":196307516,"number":29,"title":"Changed sign of input to Modelica.Mechanics.Rotational.Components.Brake","user":{"login":"modelica-trac-importer","id":22202507,"avatar_url":"https://avatars.githubusercontent.com/u/22202507?v=3","gravatar_id":"","url":"https://api.github.com/users/modelica-trac-importer","html_url":"https://github.com/modelica-trac-importer","followers_url":"https://api.github.com/users/modelica-trac-importer/followers","following_url":"https://api.github.com/users/modelica-trac-importer/following{/other_user}","gists_url":"https://api.github.com/users/modelica-trac-importer/gists{/gist_id}","starred_url":"https://api.github.com/users/modelica-trac-importer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/modelica-trac-importer/subscriptions","organizations_url":"https://api.github.com/users/modelica-trac-importer/orgs","repos_url":"https://api.github.com/users/modelica-trac-importer/repos","events_url":"https://api.github.com/users/modelica-trac-importer/events{/privacy}","received_events_url":"https://api.github.com/users/modelica-trac-importer/received_events","type":"User","site_admin":false},"labels":[{"id":503143283,"url":"https://api.github.com/repos/tbeu/Modelica/labels/bug","name":"bug","color":"ee0701","default":true},{"id":503147765,"url":"https://api.github.com/repos/tbeu/Modelica/labels/Mechanics.Rotational","name":"Mechanics.Rotational","color":"0000aa","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-12-18T23:41:53Z","updated_at":"2016-12-18T23:41:53Z","closed_at":null,"body":"**Reported by hubertus on 7 Dec 2007 14:54 UTC**\nDear all,\nIt seems that brake in Modelica.Mechanics.Rotational.Components is not backward compatible with MSL 2.2.2, due to a sign change in equation:\n  flange_a.tau + flange_b.tau + tau = 0; (changed sign of tau)\n\nPractical this means that a positive input to break now creates an acceleration.\n\nAttached is a simple example based on MSL 3 and MSL 2.2.2.\n\nBest regards,\nJohan Windahl, Modelon \n\n\nMigrated-From: https://trac.modelica.org/Modelica/ticket/29"}}
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