Evaluation of Aircraft Actuator Technologies

Abstract

The flight control actuation system is one of the most critical systems in an aircraft. A failure of this system cannot occur, since it would have catastrophic consequences. The environment it operates in is considered as highly demanding, with temperatures ranging from -50 to +60 degrees Celsius, speeds from 0 to Mach 2+ and G-forces from -3 up to 9. At the same time, the system shall be as small and lightweight as possible, since every gram and cm 3 will decrease the available payload and/or increase the total aircraft size, which in turn increase the fuel-burn. The preferred choice of technology for actuators has, since the late 1930s, been hydraulics. Hydraulic actuators are characterized by high power density, high technical maturity, high safety, and high response. With emerging benefits from the electric domain, research during the last decade has been focusing on electrified alternatives as the future alternative for actuators.First of all, I would like to thank my main supervisor, Professor Petter Krus. Thank you for being a source of inspiration, and for your guidance within the academic world. I also want to express my deepest gratitude to my co-supervisor, Dr. Alessandro Dell'Amico. Thank you for believing in me, for your great dedication, for all your support and for pushing me to always improve.I also would like to thank my former and current managers, Niklas Fält, Marina Wallin, Dr. Klara Grönhagen and Andreas Albrektsson. Thank you for your trust, support and for helping me keeping a good balance in between academic-and industrial work. Thank you to all my colleagues at Saab for being curious about my work, for your patience and for all your support. I also want to thank all colleges at FLUMES for your guidance, all great chats and memories from this journey. A special thank you to Christopher Reichenwallner, who has walked this journey beside me. Thank you for all therapeutic sessions, jokes and late nights of work together.Finally I want to thank my family and friends. Thank you for all support. And to my fiancee Frida, thank you for your endless support, your patience, your help in finding balance in life and your ability to always know what I need.

Current Status and Future Perspective on Lithium Metal Anode Production Methods

“…[86] Compared to the extrusion process, the rolling process is more costly, and the number of rolling steps increases the cost of the process. [87] To minimize this, Stumper et al [88] studied the effect of the lithium foil geometries, line load, and roller temperature on the deformation behavior of the lithium foil to stablish a semiempirical model to predict the lithium processing and validity ranges. Unfortunately, the densification toward 0% has still not been solved by the industry.…”

A Conceptual Framework for Production Innovation: Expanding and Creating New Production Capabilities

“…Production innovation can be described as "the process of either increasing or developing a production capability" (Larsson, 2017;Romero et al, 2017), and hence "the ability of a production system (with its inherent technologies, resources, information, and management systems) to perform its intended task", i.e. to produce a product (Romero et al, 2017).…”

“…The process of either increasing or developing a new production (manufacturing) capability together with the manufacturing firm's organisational (workforce) capabilities by implementing new production equipment and deploying a new work method for it in a production environment (Larsson, 2017;Romero et al, 2017). (Foster, 1985).…”

“…Production innovation can be described as the process of either increasing or developing a production capability together with the manufacturing firm's organisational capabilities by implementing new production equipment and deploying new work methods in a production environment (Larsson, 2017;Romero et al, 2017). Hence, in general terms, production innovation is defined as "the process of change", where ideas are transformed into new processes, technologies, tools and/or work methods within a production system to create value for the organisation and its stakeholders" (Larsson, 2017;Romero et al, 2017). These descriptions or definitions incorporate different types of "innovative production developments", ranging from valuable optimisations of a production process to radically new production technologies, revolutionising industries.…”

“I try to encourage my students to think, read, and talk science” intelligible identities in university teachers' figured worlds of higher education biology

“…Rooted in feminist and critical pedagogies, research employing the concept of science identity has generated crucial insights and understandings of processes influencing participation in science practices (e.g., Adams & Gupta, 2017;Avraamidou, 2020b;Beijaard et al, 2004;Carlone & Johnson, 2007;Gonsalves et al, 2019;Hazari et al, 2013Hazari et al, , 2020Jackson & Seiler, 2013;Moore, 2008;Ong et al, 2018;Rahm & Moore, 2016). Simultaneously, science identity research has diversified in terms of both education environment and level such as out of school (e.g., Archer et al, 2016), primary (e.g., Archer et al, 2013), middle (e.g., Tan et al, 2013), and secondary school education (e.g., Archer et al, 2017;Carlone, 2003;Hazari et al, 2010;Holmegaard et al, 2014) and has furthermore shaped understandings of tertiary science (e.g., Avraamidou, 2020b;Jackson & Seiler, 2013;Johansson, 2018) and science teacher education (e.g., Avraamidou, 2016;Larsson, 2019Larsson, , 2021. Despite generating valuable insights in diverse educational contexts, qualitative work on possible and impossible science identities in higher education biology is rather scarce.…”