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Control of Additive Manufacturing Processes
时间:2018-06-28 16:17    点击:   所属单位:机电工程学院
讲座名称 Control of Additive Manufacturing Processes
讲座时间 2018-07-10 14:30:00
讲座地点 北校区图书馆西裙楼三楼学术报告厅
讲座人 Dr. Robert G. Landers
讲座人介绍 Dr. Robert G. Landers (landersr@mst.edu) is currently a Curators’ Distinguished Professor of Mechanical Engineering in the Department of Mechanical and Aerospace Engineering at the Missouri University of Science and Technology (formerly University of Missouri Rolla) and the department’s Associate Chair for Graduate Affairs. He received his Ph.D. degree in Mechanical Engineering from the University of Michigan in 1997. His research and teaching interests are in the areas of modeling, analysis, monitoring, and control of manufacturing processes (metal cutting, wire saw machining, friction stir welding, laser metal deposition, freeze–form extrusion fabrication, glass direct energy deposition, and selective laser melting), estimation and control of electrochemical alternative energy systems (hydrogen fuel cells and advanced batteries) and electro–hydraulic systems, and digital control applications, and has over 200 refereed technical publications. He received the Society of Manufacturing Engineers’ Outstanding Young Manufacturing Engineer Award in 2004 and the ASME Journal of Manufacturing Science and Engineering Best Paper Award in 2014, is a Fellow of ASME, a senior member of IEEE and SME, and a member of ASEE. He served as associate editor for the ASME Journal of Dynamic Systems, Measurement, and Control (2009–2012), ASME Journal of Manufacturing Science and Engineering (2010–2014), and the IEEE Transactions on Control System Technology (2006–2012), and is currently an associate editor for Mechatronics.
讲座内容   In additive manufacturing, location-specific mechanical properties can be tailored by grading multiple materials, complex geometries that cannot be manufactured with traditional processes can be fabricated, and cost-effective part repair and low volume manufacturing can be realized. However, additive manufacturing processes have tremendous variability and are not well understood. This has led to significant research efforts into controlling additive manufacturing process. This talk will discuss recent research in the control-oriented modeling and feedback control of two additive manufacturing processes. The first process is a blown powder metal Direct Energy Deposition (DED) process commonly known as Laser Metal Deposition (LMD). This process is ideal for fabricating large parts, putting engineering features on parts, and part repair. We will explore a methodology for control-oriented modeling of the LMD process and introduce two-dimensional modeling (time and layer domain) for additive manufacturing processes. This work leads to the concept of layer-to-layer control for additive manufacturing where process parameters are adjusted between each layer. The second process is a ceramic extrusion process known as Freeze-form Extrusion Fabrication (FEF). This process is ideal for the fabrication of ceramic parts with complex geometries and multiple materials. We will explore empirical modeling and control of the extrusion force and then transition to first principle control-oriented modeling of the extrusion force and filament freezing time. Initial research in the control-oriented modeling and control of a new glass filament DED process and a powder bed metal DED process known as Selective Laser Melting (SLM) will be touched upon.
 
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