{"id":99,"date":"2019-05-06T16:47:41","date_gmt":"2019-05-06T16:47:41","guid":{"rendered":"https:\/\/pressbooks.library.ryerson.ca\/controlsystems\/?post_type=chapter&#038;p=99"},"modified":"2021-01-12T18:15:23","modified_gmt":"2021-01-12T18:15:23","slug":"1-3-control-objectives","status":"publish","type":"chapter","link":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/chapter\/1-3-control-objectives\/","title":{"raw":"1.3 Control Objectives","rendered":"1.3 Control Objectives"},"content":{"raw":"<ul>\r\n \t<li style=\"text-align: justify\">Implicit objective and First Priority: no damage, safety considerations \u2013 i.e.<\/li>\r\n \t<li style=\"text-align: justify\">Once the system is stable, then what?<\/li>\r\n \t<li style=\"text-align: justify\">Explicit objectives:\r\n<ul>\r\n \t<li>Tracking\r\n<ul>\r\n \t<li>In steady state<\/li>\r\n \t<li>In transient state<\/li>\r\n<\/ul>\r\n<\/li>\r\n \t<li>Disturbance Rejection.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n<p style=\"text-align: justify\"><strong>Tracking: <\/strong>The objective is to force the process output to follow, or track, a desired reference signal. We will concentrate on Steady State Tracking of steps, ramps, and slowly time varying signals as well as on Transient Tracking - we will focus on one particular type of response - Step (i.e. response to a step reference), because of its discontinuity. It is a very harsh input to a system and all dynamic limitations of the system will be laid bare by it.<\/p>\r\n<p style=\"text-align: justify\">Special case of Tracking - REGULATION: the reference signal is constant (can be zero). Control objective focuses on maintaining Steady State, regardless of possible Disturbance and\/or Parameter Shift.<\/p>\r\n<p style=\"text-align: justify\"><strong>Disturbance Rejection: <\/strong>The objective is to make sure that the process output follows, or tracks, a desired reference signal, despite any unwanted additional inputs, i.e. disturbances.<\/p>\r\n<p style=\"text-align: justify\">Question: What is noise, as opposed to disturbance? Can you give examples of noise in the context of control systems?<\/p>\r\n<p style=\"text-align: justify\"><strong>1.3.1 Control Methodology<\/strong><\/p>\r\n<p style=\"text-align: justify\">Control objectives must be achieved within:<\/p>\r\n\r\n<ul style=\"text-align: justify\">\r\n \t<li>Established measures of system performance<\/li>\r\n \t<li>Practical limitations imposed by the equipment<\/li>\r\n<\/ul>\r\n[caption id=\"attachment_103\" align=\"aligncenter\" width=\"1017\"]<img src=\"http:\/\/pressbooks.library.ryerson.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11.png\" alt=\"Figure 1\u201111 Methodology of Control\" width=\"1017\" height=\"767\" class=\"wp-image-103 size-full\" \/> Figure 1\u201111 Methodology of Control[\/caption]","rendered":"<ul>\n<li style=\"text-align: justify\">Implicit objective and First Priority: no damage, safety considerations \u2013 i.e.<\/li>\n<li style=\"text-align: justify\">Once the system is stable, then what?<\/li>\n<li style=\"text-align: justify\">Explicit objectives:\n<ul>\n<li>Tracking\n<ul>\n<li>In steady state<\/li>\n<li>In transient state<\/li>\n<\/ul>\n<\/li>\n<li>Disturbance Rejection.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p style=\"text-align: justify\"><strong>Tracking: <\/strong>The objective is to force the process output to follow, or track, a desired reference signal. We will concentrate on Steady State Tracking of steps, ramps, and slowly time varying signals as well as on Transient Tracking &#8211; we will focus on one particular type of response &#8211; Step (i.e. response to a step reference), because of its discontinuity. It is a very harsh input to a system and all dynamic limitations of the system will be laid bare by it.<\/p>\n<p style=\"text-align: justify\">Special case of Tracking &#8211; REGULATION: the reference signal is constant (can be zero). Control objective focuses on maintaining Steady State, regardless of possible Disturbance and\/or Parameter Shift.<\/p>\n<p style=\"text-align: justify\"><strong>Disturbance Rejection: <\/strong>The objective is to make sure that the process output follows, or tracks, a desired reference signal, despite any unwanted additional inputs, i.e. disturbances.<\/p>\n<p style=\"text-align: justify\">Question: What is noise, as opposed to disturbance? Can you give examples of noise in the context of control systems?<\/p>\n<p style=\"text-align: justify\"><strong>1.3.1 Control Methodology<\/strong><\/p>\n<p style=\"text-align: justify\">Control objectives must be achieved within:<\/p>\n<ul style=\"text-align: justify\">\n<li>Established measures of system performance<\/li>\n<li>Practical limitations imposed by the equipment<\/li>\n<\/ul>\n<figure id=\"attachment_103\" aria-describedby=\"caption-attachment-103\" style=\"width: 1017px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/pressbooks.library.ryerson.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11.png\" alt=\"Figure 1\u201111 Methodology of Control\" width=\"1017\" height=\"767\" class=\"wp-image-103 size-full\" srcset=\"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11.png 1017w, https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11-300x226.png 300w, https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11-768x579.png 768w, https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11-65x49.png 65w, https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11-225x170.png 225w, https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-content\/uploads\/sites\/75\/2019\/05\/fig1_11-350x264.png 350w\" sizes=\"auto, (max-width: 1017px) 100vw, 1017px\" \/><figcaption id=\"caption-attachment-103\" class=\"wp-caption-text\">Figure 1\u201111 Methodology of Control<\/figcaption><\/figure>\n","protected":false},"author":118,"menu_order":3,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-99","chapter","type-chapter","status-publish","hentry"],"part":3,"_links":{"self":[{"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/pressbooks\/v2\/chapters\/99","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/wp\/v2\/users\/118"}],"version-history":[{"count":9,"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/pressbooks\/v2\/chapters\/99\/revisions"}],"predecessor-version":[{"id":2621,"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/pressbooks\/v2\/chapters\/99\/revisions\/2621"}],"part":[{"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/pressbooks\/v2\/parts\/3"}],"metadata":[{"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/pressbooks\/v2\/chapters\/99\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/wp\/v2\/media?parent=99"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/pressbooks\/v2\/chapter-type?post=99"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/wp\/v2\/contributor?post=99"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.library.torontomu.ca\/controlsystems\/wp-json\/wp\/v2\/license?post=99"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}