0000000000907487
AUTHOR
Morten Kollerup Bak
Experimental investigation of effect of printing direction and surface roughness on the mechanical properties of AlSi10Mg-alloy produced by selective laser melting
The additive manufacturing has initially gained popularity for production of non-loadbearing parts and components or in the fields where the material strength and ductility are less important such as modelling and rapid prototyping. But as the technology develops, availability of metal additive manufacturing naturally dictates the desire to use the produced components in load-bearing parts. This requires not-only a thorough documentation on the mechanical properties but also additional and independent research to learn the expected level of variation of the mechanical properties and what factors affect them. The presented paper investigates strength, ductility, hardness, and microstructure …
Robust tool point control for offshore knuckle boom crane
Author's version of a chapter in the book: Proceedings of the 18th IFAC World Congress 2011. Also available from the publisher at: http://dx.doi.org/10.3182/20110828-6-IT-1002.03004 This paper considers the design of an H∞ controller for tool point control of a hydraulically actuated knuckle boom crane. The paper describes the modelling of the crane's mechanical and hydraulic systems and a disturbance model. These are linearised and combined in a state-space model used for the controller design. The controller synthesis problem is to design (if possible) an admissible controller that solves the problem of robust regulation against step inputs with an H∞ constraint based on the internal mode…
Model based design of electro-hydraulic motion control systems for offshore pipe handling equipment
Doktorgradsavhandling i mekatronikk, Universitetet i Agder, 2014 Despite the fact that hydraulics, in general, is considered a mature technology, design of hydraulic systems still offers a number of challenges for both component suppliers and manufacturers of hydraulically actuated machines such as offshore pipe handling equipment. This type of equipment is characterized by high price, high level of system complexity and low production numbers. It requires a great level of skill and experience to develop the equipment and the focus on production and development costs is constantly increasing. Therefore design engineers continuously have to improve their procedures for decision making regard…