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Usually the multiple overflow tanks are supplied by a shared overflow pipeline, which gives rise to large coupling effects in the controls for the flow rates of multiple overflow tanks simultaneously. To solve this issue, it is necessary to keep the water pressure in the shared overflow pipeline accurately constant, which is not easy due to strong disturbances. Several control strategies have been proposed to control the constant water pressure. However, most of them (such as proportional-integral-derivative and model predictive control) reject disturbances just through feedback regulation and do not reject disturbances directly. This may cause poor control performances in the presence of strong disturbances. For improving the disturbance rejection performance, a control scheme based on proportional-integral-derivatives and disturbance observer is put forward in this paper. The scheme employs disturbance observer as feedforward compensation and a proportional-integral-derivative controller as feedback regulation. The disturbance rejection properties under both model mismatches and external disturbances are discussed. The test results illustrate that the proposed method can remarkably improve the disturbance attenuation property compared with the conventional proportional-integral-derivative method in the hydraulic classification process.<\/jats:p>","DOI":"10.1177\/0142331217693917","type":"journal-article","created":{"date-parts":[[2017,3,15]],"date-time":"2017-03-15T20:10:51Z","timestamp":1489608651000},"page":"1863-1872","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Composite disturbance rejection control for hydraulic classification"],"prefix":"10.1177","volume":"40","author":[{"given":"Dan","family":"Niu","sequence":"first","affiliation":[{"name":"School of Automation, Southeast University, China"},{"name":"Key Laboratory of Measurement and Control of CSE, Ministry of Education, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xisong","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Automation, Southeast University, China"},{"name":"Key Laboratory of Measurement and Control of CSE, Ministry of Education, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaojun","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Automation, Southeast University, China"},{"name":"Key Laboratory of Measurement and Control of CSE, Ministry of Education, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xingpeng","family":"Zhou","sequence":"additional","affiliation":[{"name":"School of Automation, Southeast University, China"},{"name":"Key Laboratory of Measurement and Control of CSE, Ministry of Education, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2017,3,15]]},"reference":[{"key":"bibr1-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1007\/s13204-014-0328-z"},{"key":"bibr2-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1007\/s11269-006-4635-3"},{"key":"bibr3-0142331217693917","first-page":"23","volume-title":"Proceedings of physical separation, minerals engineering conference","author":"Bazin C","year":"2011"},{"key":"bibr4-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1016\/j.scriptamat.2015.10.023"},{"key":"bibr5-0142331217693917","doi-asserted-by":"publisher","DOI":"10.4314\/wsa.v38i4.12"},{"key":"bibr6-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1016\/S0967-0661(00)00058-7"},{"key":"bibr7-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/TMECH.2004.839034"},{"key":"bibr8-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/41.857974"},{"key":"bibr9-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1016\/j.jprocont.2009.02.004"},{"key":"bibr10-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1016\/j.minpro.2008.11.004"},{"key":"bibr11-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1016\/j.powtec.2015.01.068"},{"issue":"4","key":"bibr12-0142331217693917","first-page":"1892","volume":"34","author":"Huang YH","year":"1998","journal-title":"IEEE\/ASME Transactions on Mechatronics"},{"issue":"4","key":"bibr13-0142331217693917","first-page":"1895","volume":"34","author":"Ishikawa J","year":"1998","journal-title":"IEEE\/ASME Transactions on Mechatronics"},{"key":"bibr14-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1007\/s12555-011-0416-8"},{"key":"bibr15-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/TIE.2006.885459"},{"key":"bibr16-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/87.784416"},{"key":"bibr17-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/TAC.2010.2049522"},{"key":"bibr18-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/TIE.2007.905948"},{"key":"bibr19-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/TPS.1986.4316563"},{"key":"bibr20-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1016\/j.fuel.2013.02.033"},{"key":"bibr21-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1016\/j.minpro.2011.05.011"},{"key":"bibr22-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1177\/0142331214558681"},{"key":"bibr23-0142331217693917","doi-asserted-by":"publisher","DOI":"10.1109\/TAES.2013.6404120"},{"key":"bibr24-0142331217693917","unstructured":"Li SH, Yang J, Chen WH, et al. 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