Pub Date : 2022-06-13DOI: 10.1007/978-3-319-89920-6_32
Felix Hennings
{"title":"Benefits and Limitations of Simplified Transient Gas Flow Formulations","authors":"Felix Hennings","doi":"10.1007/978-3-319-89920-6_32","DOIUrl":"https://doi.org/10.1007/978-3-319-89920-6_32","url":null,"abstract":"","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"2 1","pages":"231-237"},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78771636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1007/978-3-031-08623-6_17
M. Hölscher
{"title":"The Student-Project Allocation Problem as Part of Timetabling in Project-Oriented Schools","authors":"M. Hölscher","doi":"10.1007/978-3-031-08623-6_17","DOIUrl":"https://doi.org/10.1007/978-3-031-08623-6_17","url":null,"abstract":"","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"79 1","pages":"107-113"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73342045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1007/978-3-031-08623-6_8
Jan Schwiddessen
{"title":"A Semidefinite Approach for the Single Row Facility Layout Problem","authors":"Jan Schwiddessen","doi":"10.1007/978-3-031-08623-6_8","DOIUrl":"https://doi.org/10.1007/978-3-031-08623-6_8","url":null,"abstract":"","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"1 1","pages":"45-51"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84552049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1007/978-3-031-08623-6_22
Jakob Görner, R. Janßen, Jochen Rethmann
{"title":"Distributed Solving of Mixed-Integer Programs with COIN-OR CBC and Thrift","authors":"Jakob Görner, R. Janßen, Jochen Rethmann","doi":"10.1007/978-3-031-08623-6_22","DOIUrl":"https://doi.org/10.1007/978-3-031-08623-6_22","url":null,"abstract":"","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"26 1","pages":"141-147"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82449242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1007/978-3-031-08623-6_32
F. Ehm, Volkmar Franz, Maic Regner, U. Buscher, Hanns-Christoph Held, P. Spieth
{"title":"Classifying Ready-for-Transfer Patients in the Intensive Care Unit Based on Clinical Data","authors":"F. Ehm, Volkmar Franz, Maic Regner, U. Buscher, Hanns-Christoph Held, P. Spieth","doi":"10.1007/978-3-031-08623-6_32","DOIUrl":"https://doi.org/10.1007/978-3-031-08623-6_32","url":null,"abstract":"","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"152 1","pages":"209-215"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76193891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1007/978-3-031-08623-6_62
Wolfgang Seiringer, Fabian Brockmann, K. Altendorfer, Thomas Felberbauer
{"title":"Influence of Forecast Error and Forecast Bias on Safety Stock on a MRP System with Rolling Horizon Forecast Updates","authors":"Wolfgang Seiringer, Fabian Brockmann, K. Altendorfer, Thomas Felberbauer","doi":"10.1007/978-3-031-08623-6_62","DOIUrl":"https://doi.org/10.1007/978-3-031-08623-6_62","url":null,"abstract":"","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"638 1","pages":"421-426"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80750118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In wire-arc additive manufacturing (WAAM), the desired workpiece is built layerwise by a moving heat source depositing droplets of molten wire on a substrate plate. To reduce material accumulations, the trajectory of the weld source should be continuous, but transit moves without welding, called deadheading, are possible. The enormous heat of the weld source causes large temperature gradients, leading to a strain distribution in the welded material which can lead even to cracks. In summary, it can be concluded that the temperature gradient reduce the quality of the workpiece. We consider the problem of finding a trajectory of the weld source with minimal temperature deviation from a given target temperature for one layer of a workpiece with welding segments broader than the width of the weld pool. The temperature distribution is modeled using the finite element method. We formulate this problem as a mixed-integer linear programming model and demonstrate its solvability by a standard mixed-integer solver.
{"title":"A Finite Element Approach for Trajectory Optimization in Wire-Arc Additive Manufacturing","authors":"Johannes Schmidt, J. Buhl, A. Fügenschuh","doi":"10.26127/BTUOPEN-5575","DOIUrl":"https://doi.org/10.26127/BTUOPEN-5575","url":null,"abstract":"In wire-arc additive manufacturing (WAAM), the desired workpiece is built layerwise by a moving heat source depositing droplets of molten wire on a substrate plate. To reduce material accumulations, the trajectory of the weld source should be continuous, but transit moves without welding, called deadheading, are possible. The enormous heat of the weld source causes large temperature gradients, leading to a strain distribution in the welded material which can lead even to cracks. In summary, it can be concluded that the temperature gradient reduce the quality of the workpiece. We consider the problem of finding a trajectory of the weld source with minimal temperature deviation from a given target temperature for one layer of a workpiece with welding segments broader than the width of the weld pool. The temperature distribution is modeled using the finite element method. We formulate this problem as a mixed-integer linear programming model and demonstrate its solvability by a standard mixed-integer solver.","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"77 1","pages":"325-330"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83186498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1007/978-3-031-08623-6_47
T. Müller, Christoph Knoche, P. Pelz
{"title":"From Design to Operation: Mixed-Integer Model Predictive Control Applied to a Pumping System","authors":"T. Müller, Christoph Knoche, P. Pelz","doi":"10.1007/978-3-031-08623-6_47","DOIUrl":"https://doi.org/10.1007/978-3-031-08623-6_47","url":null,"abstract":"","PeriodicalId":79700,"journal":{"name":"OR manager","volume":"26 1","pages":"318-324"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83554042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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