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In the first stage of the proposed method, unknown parameters of anti-resonance filter that is added to the forward path of the control loop of the system to minimize resonant peaks, are calculated using frequency domain data obtained from open-loop system identification tests. In the second stage, a fixed-order data-driven [Formula: see text] controller is calculated by solving an optimization problem under convex [Formula: see text] constraints obtained based on the Nyquist diagram. With the proposed method, lower order controllers that meets the performance constraints of classical model-based [Formula: see text] problems can be synthesized without need of a parametric plant model. The method developed in this study is tested experimentally on a military stabilized platform and its performance is compared with a model-based [Formula: see text] controller design method.<\/jats:p>","DOI":"10.1177\/0142331220940934","type":"journal-article","created":{"date-parts":[[2020,8,4]],"date-time":"2020-08-04T16:17:01Z","timestamp":1596557821000},"page":"1722-1733","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Fixed-order data-driven H\u221e controller synthesis for flexible mechanical systems: Two-stage approach"],"prefix":"10.1177","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7386-1405","authenticated-orcid":false,"given":"Ayhan Arda","family":"Araz","sequence":"first","affiliation":[{"name":"Mechanical Engineering Department, Hacettepe University, Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S \u00c7a\u011flar","family":"Ba\u015flam\u0131\u015fl\u0131","sequence":"additional","affiliation":[{"name":"Mechanical Engineering Department, Hacettepe University, Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"U\u011fur Mertcan","family":"\u00d6zmarangoz","sequence":"additional","affiliation":[{"name":"Defense System Technologies ASELSAN Inc., Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2020,8,4]]},"reference":[{"key":"bibr1-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1016\/S0165-1684(99)00039-0."},{"key":"bibr2-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1109\/TAC.2005.860290."},{"key":"bibr3-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1109\/ICIT.2010.5472710."},{"key":"bibr4-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1109\/ias.2000.882073."},{"key":"bibr5-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1109\/MCS.2007.910256."},{"key":"bibr6-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1016\/j.ins.2012.07.014."},{"key":"bibr7-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1109\/ICINFA.2009.5205070."},{"key":"bibr8-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1109\/3516.828586."},{"key":"bibr9-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1016\/j.automatica.2010.05.019."},{"key":"bibr10-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1002\/asjc.1069."},{"key":"bibr11-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1016\/S0957-4158(03)00013-8."},{"key":"bibr12-0142331220940934","volume-title":"Platform Motion Disturbance Decoupling by Means of Inertial Sensors for a Motion Stabilized Gimbal","author":"Mutlu D","year":"2015"},{"key":"bibr13-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1002\/9781118287422."},{"key":"bibr14-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-007-2033-6_1."},{"key":"bibr15-0142331220940934","author":"Skogestad S","year":"2005","journal-title":"Multivariable Feedback Control: Analysis and Design"},{"key":"bibr16-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1002\/rnc.3699."},{"key":"bibr17-0142331220940934","doi-asserted-by":"publisher","DOI":"10.1016\/j.actaastro.2017.11.046."},{"key":"bibr18-0142331220940934","unstructured":"Zhou K, Doyle JC (1999) Essentials of Robust Control. 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