Selaus koulutusohjelman mukaan kokoelmassa VäitöskirjatSchool of Energy Systems, Konetekniikka
Aineistot 21-40 / 55
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Finite element formulations for nonlinear beam problems based on the absolute nodal coordinate formulation
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.10.2021)The spatial simulation of highly flexible bodies is becoming more effective and feasible thanks to the current state-of-the-art in the development of advanced formulations and computer processors. This makes it possible ... -
High Power Fiber Laser Welding of Thick Section Materials – Process Performance and Weld Properties
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 27.11.2019)High power fiber laser systems have reached output powers far beyond 30 kW and a fiber laser source of 100 kW output power has recently become available for fundamental research. With the high laser power that is now ... -
Impacts of recycled carbon fibre and glass fibre as sustainable raw materials for thermosetting composites
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 23.09.2022)The fibre-reinforced polymer composites were implemented in various applications as a potential alternative to traditional metals. In particular, the carbon fibre-reinforced polymer (CFRP) and glass fibre-reinforced polymer ... -
Improved state observers and robust controllers for non-linear systems with special emphasis on robotic manipulators and electro-hydraulic servo systems
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 26.02.2021)In real world the motion control system are faced with two major problems.: 1) monitoring internal states of the system 2) generating the suitable control signal to reach a desired path and follow it with time. These ... -
Intelligent algorithms of a redundant robot system in a future fusion reactor
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 14.05.2021)A fusion reactor, also called a thermonuclear reactor, is a large-scale of size device to produce electrical power from the energy released in a nuclear fusion reaction, in which the environment is very hot and radioactive, ... -
Interaction and barrier properties of nanocellulose and hydrophobically modified ethyl(hydroxyethyl)cellulose films and coatings
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 31.03.2021)In food packaging applications, the oxygen barrier and resistance to oil and grease are essential properties of the packaging. The barrier performance of fibre-based packages needs to be improved with a coating, which is ... -
Investigation of EEG signal processing for rehabilitation robot control
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 13.12.2019)A significant number of stroke patients suffer from movement disability and the numbers are increasing annually. The Brain Computer Interface (BCI) science enables solutions for the paralyzed patients based on the location ... -
Laser and hybrid welding of high-strength structural steels
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 02.06.2023)Laser and laser-arc hybrid welding processes are recognized as key joining methods in many industrial fields such as light and heavy machinery, ship-building and the automotive industry. In the early days of laser welding, ... -
Laser powder bed fusion of steels : case studies on microstructures, mechanical properties, and notch-load interactions
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 10.11.2022)Additive manufacturing has evolved over the last few decades from utilising a prototyping approach to favouring a fabrication method. Consequently, this technology has become recognised as a potential replacement for ... -
Life cycle cost-driven design for additive manufacturing : the frontier to sustainable manufacturing in laser-based powder bed fusion
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 27.09.2021)Additive manufacturing (AM) is a manufacturing method that creates components in a layer-wise manner. Laser-based powder bed fusion (L-PBF) is one of the most used AM subcategories to manufacture metal components, referred ... -
Mechanical Design Guidelines of an Electric Vehicle Powertrain
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 01.02.2019)The tendency of alternating fossil energy sources with state-of-the-art renewable energy resources is spreading in most contemporary fuel consuming applications, and transportation, as one of the essential human needs, is ... -
Methods for lifecycle support of hydraulically actuated mobile working machines using IoT and digital twin concepts
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 25.10.2019)The Internet of Things and Digital Twins are popular but quite distant concepts nowadays. Many problems arise along the efforts of combining these concepts. This research work focuses on these problems and considers the ... -
Multibody system dynamics driven product processes
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 05.11.2021)Sustainable business models emphasize the application of digital solutions to enhance customer value throughout the product lifecycle. This dissertation contributes to the development of methods that integrate multibody- ... -
Novel Methods for Assessing and Improving Usability of a Remote-operated Off-Road Vehicle Interface
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 09.12.2019)Autonomous control systems have been under intensive development in the off-road vehicle (ORV) industry because of high demand for increasing productivity in recent decades. In those systems, the progress has happened in ... -
Numerical ductile fracture assessment of weldments in direct-quenched, ultra-highstrength steel
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 01.12.2023)Many studies conducted in recent years have raised concerns about the ultimate loadcarrying and elongation capacities of weldments made of direct-quenched, ultra-highstrength steels (UHSS). The reason for this is the ... -
On adaptive intelligent welding: technique feasibility in weld quality assurance for advanced steels
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 28.08.2018)The welding industry has a need to utilize lightweight steels in welded applications while maintaining acceptable weld quality. This goal can be achieved through effective quality assurance, efficient weld parameter ... -
On the dynamic simulation of coupled multibody and hydraulic systems for real-time applications
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.11.2019)The computer simulation of mechanical systems enables engineers to perform fast prototyping and in-depth system analysis even before a single physical model has been built. However, since mechanical systems are often ... -
On weldability of thick section austenitic stainless steel using laser processes
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 25.10.2019)Laser welding and its different process variations using filler metal addition have increasingly become the preferred joining technology of the metal structure fabrication industry. The essential characteristics of laser ... -
Operative business development through system model and changing business structures
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 24.11.2023)Global markets and related operational activities create ever-changing challenges. The fluctuations of the global economy, in addition to customer demands, introduce dynamic challenges that a company should be able to ... -
Optimizing design and process parameters for recycled thermoplastic natural fiber composites in automotive applications
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 20.05.2022)Factors such as governmental legislation, environmental concerns, and curiosity amongst researchers are fueling the need to find novel applications for the utilization of recycled thermoplastic waste. One of the exciting ...