Selaus koulutusohjelman mukaan kokoelmassa VäitöskirjatSchool of Energy Systems, Konetekniikka
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An experimental and theoretical investigation of power losses in planetary gearboxes
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 12.10.2018)Gearboxes based on planetary gear sets are preferred for their advantages, such as higher gear ratios, improved self-centering capabilities, kinematic flexibility, favorable bearing support conditions and higher power ... -
Dependence of manufacturing parameters on the performance quality of welded joints made of direct quenched ultra-high-strength steel
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 29.09.2018)The use of ultra-high-strength steels (UHSS) has increased in the engineering industry during past decades especially in the fields of welded structural applications where products are required to possess a specific ... -
Dynamic analysis of flexible multibody systems using finite elements based on the absolute nodal coordinate formulation
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 19.10.2018)The computational analysis of mechanical systems has a wide array of applications and is therefore essential in many fields of modern industry. This dissertation studies the simulation of mechanical systems using the ... -
Dynamic analysis of rotating systems including contact and thermal-induced effects
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 16.10.2018)Rotor dynamics is a special field of structural dynamics focusing on the study and analysis of rotating structures. Practical applications for rotor dynamics are found in typical industrial rotating electrical machine ... -
Fiber laser and hybrid welding of T-joint in structural steels
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 14.12.2018)Laser welding processes are amongst the most versatile joining technologies, suitable for both, small scale and mass production. The advancements in laser sources and optics is allowing autogenous laser beam welding to ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Recognizing required changes to higher education engineering programs’ information literacy education as a consequence of research problems becoming more complex
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 2018)Challenges in the Earth’s sustainable development set requirements to modern engineering education. Engineers face complex problems, which need to be solved to keep the planet viable for future generations. This study was ... -
Renewable-energy-based Single and Community Microgrids Integrated with Electricity Markets
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 22.11.2019)The deployment of renewable-energy-based microgrids in the electrical power system is a wellknown pathway to realize sustainable energy goals. Further, community microgrids incentivize residential houses to exchange renewable ... -
The efficiency and damage control of a recovery boiler
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 16.12.2019)Recovery boilers are needed to produce sustainable energy from sideline by-products of the biomass processing industry. Customers need boilers which have a reliable, long operation time without unnecessary shutdowns and ... -
The Low-Cycle Fatigue of S960 MC Direct-Quenched High-Strength Steel
Acta Universitatis Lappeenrantaensis (Lappeenranta University of Technology, 18.10.2018)Demanding strength, manufacturability and critical weight limitations are generally the main criteria in the design and fabrication of structural components. The emergence and development of ultra-high and high-strength ...
