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 ... -
Artificial intelligence : a modern approach to increasing productivity and improving weld quality in TIG welding
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 29.07.2021)Recent years have seen the welding industry facing demands for improved productivity and efficiency together with simultaneous enhancement of the quality of welded structures. The welding industry has met these challenges ... -
Contact modelling in multibody applications
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 08.10.2021)Multibody system dynamics (MSD) offers a reliable and easy-to-use tool to analyze the dynamics of complex systems. This approach allows for the description of equations of motion for a dynamic system that consist of ... -
Coupling multibody dynamics and hydraulic actuators for indirect Kalman filtering and real-time simulation
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 15.10.2021)The computer simulation of complex mechanical systems can be performed using multibody dynamics. Multibody models often include a description of hydraulic actuators, which can introduce numerical stiffness into the models. ... -
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 ... -
Development of learning methodology of additive manufacturing for mechanical engineering students in higher education
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 07.07.2021)The main aim of this thesis was to research the learning of additive manufacturing (AM) and the impact of using multiple AM technologies as a form of learning. The goal was to develop a new methodology for learning additive ... -
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 ... -
Dynamic and thermal modeling of touch-down bearings considering bearing non-idealities
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 26.06.2020)In an active magnetic bearing (AMB) supported rotor, the touchdown bearings support the rotor in case of an electromagnetic field failure or a fault in the control system. In this work, a dynamic and thermal model of ... -
Ecodesign of Construction and Demolition Waste-Derived Thermoplastic Composites
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 12.12.2020)The use of recycled materials in composites has been studied since the 1990s. Research has traditionally focused on technical properties, as well as the recyclability of materials. How these composites should be used or ... -
Effects of unbalanced magnetic pull on rotordynamics of electric machines
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 21.05.2021)The unbalanced magnetic pull (UMP) that results from air-gap eccentricity can present a potential risk to the lifetime and dynamic stability of rotating electric machines. Nevertheless, a method to identify the effects of ... -
Faster than real-time simulation of fluid power-driven mechatronic machines
Acta Universitatis Lappeenrantaensis (Lappeenranta-Lahti University of Technology LUT, 01.06.2021)The level of automation of mechatronic machines, such as excavators, logging harvesters or fluid power-driven cranes, has increased significantly over the past few decades. In the machine industry, this led to the emergence ... -
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 ... -
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 ... -
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 ... -
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 ...
