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A comparative performance study of fourpole induction motors and synchronous reluctance motors in variable speed drives
(25.06.2003)Design aspects of the Transversally Laminated Anisotropic (TLA) Synchronous Reluctance Motor (SynRM) are studied and the machine performance analysis compared to the Induction Motor (IM) is done. The SynRM rotor structure ... 
A holistic approach to measuring open innovation: contribution to theory development
(Lappeenranta University of Technology, 24.05.2018)Since its introduction more than 10 years ago, open innovation (OI) has become a popular topic in the academic literature and has been accepted by many practitioners. The paradigm incorporates recent tendencies in economic ... 
A mathematical study of fuzzy logic; an algebraic approach
(1994)Fuzzy set theory and Fuzzy logic is studied from a mathematical point of view. The main goal is to investigatecommon mathematical structures in various fuzzy logical inference systems and to establish a general mathematical ... 
A modified nominal stress method for fatigue assessment of steel plates with thermally cut edges
(Lappeenranta University of Technology, 18.12.2015)Thermal cutting methods, are commonly used in the manufacture of metal parts. Thermal cutting processes separate materials by using heat. The process can be done with or without a stream of cutting oxygen. Common processes ... 
A modified structural stress method for fatigue assessment of welded structures
(08.12.2006)Fatigue life assessment of weldedstructures is commonly based on the nominal stress method, but more flexible and accurate methods have been introduced. In general, the assessment accuracy is improved as more localized ... 
A multimethod examination of contributors to successful onthejob learning for vocational students
(Lappeenranta University of Technology, 18.12.2014)Rapid changes in working life and competence requirements of different professions have increased interest in workplace learning. It is considered an effective way to learn and update professional skills by performing daily ... 
A novel approachfor assessing the fatigue strength of ultrasonic impact treated welded structures.
(18.12.2007)It is commonly observed that complex fabricated structures subject tofatigue loading fail at the welded joints. Some problems can be corrected by proper detail design but fatigue performance can also be improved using ... 
A novel procedure for establishing clinching parameters for high strength steel sheet
(2000)The building industry has a particular interest in using clinching as a joining method for frame constructions of lightframe housing. Normally many clinch joints are required in joining of frames.In order to maximise the ... 
A Numerical Study of Forest Influences on the Atmospheric Boundary Layer and Wind Turbines
(Lappeenranta University of Technology, 21.07.2017)In the past years, energy consumption in Finland was not fully covered by the energy produced in Finland, and approximately 20% of the total energy consumption was imported. Despite the suitable wind condition, the wind ... 
A Soft Contact Collision Method For RealTime Simulation of Triangularized Geometries in Multibody Dynamics
(Lappeenranta University of Technology, 27.05.2013)When modeling machines in their natural working environment collisions become a very important feature in terms of simulation accuracy. By expanding the simulation to include the operation environment, the need for a ... 
A study of combustion phenomena in circulating fluidized beds by developing and applying experimental and modelling methods for laboratoryscale reactors
(Lappeenranta University of Technology, 22.12.2010)The results shown in this thesis are based on selected publications of the 2000s decade. The work was carried out in several national and EC funded public research projects and in close cooperation with industrial partners. ... 
A Study on Fractionation and Ultrafiltration of Proteins with Characterized Modified and Unmodified Membranes
(23.08.1996)Membrane filtration has become increasingly attractive in the processing of both foodand biotechnological products. However, the poor selectivity of the membranes and fouling are the critical factors limiting the development ... 
A Topological Approach to Fuzzy Sets
(1999)This thesis presents a topological approach to studying fuzzy setsby means of modifier operators. Modifier operators are mathematical models, e.g., for hedges, and we present briefly different approaches to studying modifier ... 
Acidic dissolution of iron oxides and regeneration of a ceramic filter medium
(Lappeenranta University of Technology, 14.12.2012)The dewatering of iron ore concentrates requires large capacity in addition to producing a cake with low moisture content. Such large processes are commonly energy intensive and means to lower the specific energy consumption ... 
Active du/dt Filtering for VariableSpeed AC Drives
(Lappeenranta University of Technology, 17.12.2009)An oscillating overvoltage has become a common phenomenon at the motor terminal in inverterfed variablespeed drives. The problem has emerged since modern insulated gate bipolar transistors have become the standard choice ... 
Active inverter output filtering methods
(Lappeenranta University of Technology, 12.10.2012)Frequency converters are widely used in the industry to enable better controllability and efficiency of variable speed AC motor drives. Despite these advantages, certain challenges concerning the inverter and motor ... 
Adaptive Markov chain Monte Carlo and Bayesian filtering for state space models
(Lappeenranta University of Technology, 12.12.2014)This thesis is concerned with the state and parameter estimation in state space models. The estimation of states and parameters is an important task when mathematical modeling is applied to many different application areas ... 
Adaptive MCMC methods with applications in environmental and geophysical models
(Finnish Meteorological Institute, 14.03.2008)This work presents new, efficient Markov chain Monte Carlo (MCMC) simulation methods for statistical analysis in various modelling applications. When using MCMC methods, the model is simulated repeatedly to explore the ... 
Additional revenue opportunities in pulp mills and their impacts on the kraft process
(Lappeenranta University of Technology, 18.12.2013)Although the concept of multiproducts biorefinery provides an opportunity to meet the future demands for biofuels, biomaterials or chemicals, it is not assured that its implementation would improve the profitability of ... 
Adsorptive removal of harmful organic compound from aqueous solutions
(Lappeenranta University of Technology, 21.12.2010)Adsorption is one of the most commonly used methods in water treatment processes. It is attractive due to it easy operation and the availability of a wide variety of commercial adsorbents. This doctoral thesis focuses on ...