AMB system for high-speed motors using automatic commissioning

The general trend towards increasing e ciency and energy density drives the industry to high-speed technologies. Active Magnetic Bearings (AMBs) are one of the technologies that allow contactless support of a rotating body. Theoretically, there are no limitations on the rotational speed. The absence of friction, low maintenance cost, micrometer precision, and programmable sti ness have made AMBs a viable choice for highdemanding applications. Along with the advances in power electronics, such as signi cantly improved reliability and cost, AMB systems have gained a wide adoption in the industry. The AMB system is a complex, open-loop unstable system with multiple inputs and outputs. For normal operation, such a system requires a feedback control. To meet the high demands for performance and robustness, model-based control techniques should be applied. These techniques require an accurate plant model description and uncertainty estimations. The advanced control methods require more e ort at the commissioning stage. In this work, a methodology is developed for an automatic commissioning of a subcritical, rigid gas blower machine. The commissioning process includes open-loop tuning of separate parts such as sensors and actuators. The next step is to apply a system identi cation procedure to obtain a model for the controller synthesis. Finally, a robust model-based controller is synthesized and experimentally evaluated in the full operating range of the system. The commissioning procedure is developed by applying only the system components available and a priori knowledge without any additional hardware. Thus, the work provides an intelligent system with a self-diagnostics feature and an automatic commissioning.

Heavy Duty Speed Wagon

kuv., 10 x 23 cm

Multibody Simulation Model of the Roller Test Rig

Multibody simulation model of the roller test rig is presented in this work. The roller test rig consists of a paper machine’s tube roll supported with a hard bearing type balancing machine. The simulation model includes non-idealities that are measured from the physical structure. These non-idealities are the shell thickness variation of the roll and roundness errors of the shafts of the roll. These kinds of non-idealities are harmful since they can cause subharmonic resonances of the rotor system. In this case, the natural vibration mode of the rotor is excited when the rotation speed is a fraction of the natural frequency of the system. With the simulation model, the half critical resonance is studied in detail and a sensitivity analysis is performed by simulating several analyses with slightly different input parameters. The model is verified by comparing the simulation results with those obtained by measuring the real structure. Comparison shows that good accuracy is achieved, since equivalent responses are achieved within the error limit of the input parameters.

International "Six-Speed Special"

kuv., 22 x 30 cm

"It's Barack Obama Who's Soft" Political Bias on BBC, CNN, and Fox News: A Critical Discourse Analysis of News Websites

Tutkielmassa analysoidaan kolmen internetsivuston uutisartikkeleita kielitieteen näkökulmasta. Tavoitteena on selvittää esiintyykö internetsivustojen BBC, CNN ja Fox News uutisoinnissa politiikkaan liittyviä ennakkoasenteita tai puolueellisuuksia ja miten ne käytännössä näkyvät uutisartikkeleiden kielessä. Kriittiseen diskurssianalyysiin pohjautuen tutkielma esittelee jokaisen uutissivuston taustaan (esimerkiksi rakenteeseen ja rahoitukseen) liittyviä seikkoja sekä mediadiskurssiin ja politiikkaan liittyvät taustatiedot, jolla taataan Norman Fairclough'n kolmivaiheisen menetelmän mahdollisimman perusteellinen toteuttaminen. Uutissivustoja analysoidaan kriittiselle diskurssianalyysille sopivan funktionaalisen kieliopin ja muiden lingvististen välineiden avulla. Koko aineiston (404 artikkelia) otsikot analysoidaan ensin, minkä jälkeen analysoidaan yhdeksän kokonaista artikkelia kolmeen eri aihealueeseen liittyen niin, että jokaiselta internetsivustolta analysoidaan yksi artikkeli jokaista aihetta kohden. Analyysikeinoina käytetään ensisijaisesti systeemis-funktionaalisen kieliopin tekstuaalisen metafunktion välineitä (thematic structure). Myös ideationaalisen metafunktion välineitä (transitivity), referenssiketjuja (referential identity chains) ja leksikaalista analyysia käytetään hyväksi. Lähtökohtaisesti tavoitteena on analysoida uutissivustoja vertailevasti, jolloin analyysin tulokset ovat paremmin havainnoitavissa ja perusteltavissa. Hypoteesi aikaisempien tutkimusten ja yleisen mielikuvan perusteella on, että CNN uutisoi demokraattipuolueelle ja Fox News taas republikaanipuolueelle edulliseen sävyyn. Tutkimustulokset vaihtelivat hypoteesia tukevista ja sen vastaisista tuloksista niihin, jotka eivät olleet tarpeeksi tuettuja kumpaankaan suuntaan. Vahvimmat tulokset ovat kuitenkin hypoteesia tukevia, joten tässä tutkielmassa todetaan, ettei uutisointi ole puolueetonta ainakaan näiden kolmen internetsivuston kohdalla. Lisäksi muutaman aihealueen kohdalla uutisointi on niin toistuvaa tietystä näkökulmasta, että luonnollistumisteorian mukaista aatteiden luonnollistumista saattaa tapahtua. Tutkielmassa käytettyjen menetelmien menestyksen perusteella suositellaan, että tekstuaalisen metafunktion analyysivälineitä käytetään enemmän. Lisäksi suositellaan meta-analyysin harkitsemista, jotta voitaisiin selvittää, mitkä analyysimetodit parhaiten sopivat minkäkinlaisen aineiston analysointiin.

Improving customer service by identifying critical success factors and utilizing business process outsourcing

Consumers increasingly demand convenience when dealing with companies and therefore it is important to provide professional, diverse and speedy service via customer’s preferred communication channel. These interactions between the customer service and customer have a critical role in customer’s future purchasing decisions. Those customers who don't receive satisfactory customer service are willing to do business with another company that charges more but offers better customer service. This study identifies the critical success factors for the customer service in order to improve the customer service according to the company’s mission and meet customer expectations. Case study is used as a research method and data is collected via observation, archival records and interviews during a time span of fourteen months. The analysis suggests three critical success factors: voice support, scalable and flexible customer service and customer service champions. The study further analyzes the improvement measures according to the critical success factors concluding the Business Process Outsourcing to be the most proper to proceed with. As a conclusion of the study, critical success factors enable achieving the goals of the customer service and align operations according to the company’s mission. Business Process Outsourcing plays important role in improving the customer service by allowing fast expansion of new service offering and obtaining specialized workforce.

Does speed matter? : the impact of the EU membership incentive on rule adoption in minority language rights protection

Denna avhandling tar sin utgångspunkt i ett ifrågasättande av effektiviteten i EU:s konditionalitetspolitik avseende minoritetsrättigheter. Baserat på den rationalistiska teoretiska modellen, External Incentives Model of Governance, syftar denna hypotesprövande avhandling till att förklara om tidsavståndet på det potentiella EU medlemskapet påverkar lagstiftningsnivån avseende minoritetsspråksrättigheter. Mätningen av nivån på lagstiftningen avseende minoritetsspråksrättigheter begränsas till att omfatta icke-diskriminering, användning av minoritetsspråk i officiella sammanhang samt minoriteters språkliga rättigheter i utbildningen. Metodologiskt används ett jämförande angreppssätt både avseende tidsramen för studien, som sträcker sig mellan 2003 och 2010, men även avseende urvalet av stater. På basis av det \"mest lika systemet\" kategoriseras staterna i tre grupper efter deras olika tidsavstånd från det potentiella EU medlemskapet. Hypotesen som prövas är följande: ju kortare tidsavstånd till det potentiella EU medlemskapet desto större sannolikhet att staternas lagstiftningsnivå inom de tre områden som studeras har utvecklats till en hög nivå. Studien visar att hypotesen endast bekräftas delvis. Resultaten avseende icke-diskriminering visar att sambandet mellan tidsavståndet och nivån på lagstiftningen har ökat markant under den undersökta tidsperioden. Detta samband har endast stärkts mellan kategorin av stater som ligger tidsmässigt längst bort ett potentiellt EU medlemskap och de två kategorier som ligger närmare respektive närmast ett potentiellt EU medlemskap. Resultaten avseende användning av minoritetsspråk i officiella sammanhang och minoriteters språkliga rättigheter i utbildningen visar inget respektive nästan inget samband mellan tidsavståndet och utvecklingen på lagstiftningen mellan 2003 och 2010.

Drivers and barriers of mobile travel and tourism service adoption : a study of individual perceptions and business model development in a travel and tourism context

The Travel and Tourism field is undergoing changes due to the rapid development of information technology and digital services. Online travel has profoundly changed the way travel and tourism organizations interact with their customers. Mobile technology such as mobile services for pocket devices (e.g. mobile phones) has the potential to take this development even further. Nevertheless, many issues have been highlighted since the early days of mobile services development (e.g. the lack of relevance, ease of use of many services). However, the wide adoption of smartphones and the mobile Internet in many countries as well as the formation of so-called ecosystems between vendors of mobile technology indicate that many of these issues have been overcome. Also when looking at the numbers of downloaded applications related to travel in application stores like Google Play, it seems obvious that mobile travel and tourism services are adopted and used by many individuals. However, as business is expected to start booming in the mobile era, many issues have a tendency to be overlooked. Travelers are generally on the go and thus services that work effectively in mobile settings (e.g. during a trip) are essential. Hence, the individuals’ perceived drivers and barriers to use mobile travel and tourism services in on-site or during trip settings seem particularly valuable to understand; thus this is one primary aim of the thesis. We are, however, also interested in understanding different types of mobile travel service users. Individuals may indeed be very different in their propensity to adopt and use technology based innovations (services). Research is also switching more from investigating issues of mobile service development to understanding individuals’ usage patterns of mobile services. But designing new mobile services may be a complex matter from a service provider perspective. Hence, our secondary aim is to provide insights into drivers and barriers of mobile travel and tourism service development from a holistic business model perspective. To accomplish the research objectives seven different studies have been conducted over a time period from 2002 – 2013. The studies are founded on and contribute to theories within diffusion of innovations, technology acceptance, value creation, user experience and business model development. Several different research methods are utilized: surveys, field and laboratory experiments and action research. The findings suggest that a successful mobile travel and tourism service is a service which supports one or several mobile motives (needs) of individuals such as spontaneous needs, time-critical arrangements, efficiency ambitions, mobility related needs (location features) and entertainment needs. The service could be customized to support travelers’ style of traveling (e.g. organized travel or independent travel) and should be easy to use, especially easy to take into use (access, install and learn) during a trip, without causing security concerns and/or financial risks for the user. In fact, the findings suggest that the most prominent barrier to the use of mobile travel and tourism services during a trip is an individual’s perceived financial cost (entry costs and usage costs). It should, however, be noted that regulations are put in place in the EU regarding data roaming prices between European countries and national telecom operators are starting to see ‘international data subscriptions’ as a sales advantage (e.g. Finnish Sonera provides a data subscription in the Baltic and Nordic region at the same price as in Finland), which will enhance the adoption of mobile travel and tourism services also in international contexts. In order to speed up the adoption rate travel service providers could consider e.g. more local initiatives of free Wi-Fi networks, development of services that can be used, at least to some extent, in an offline mode (do not require costly network access during a trip) and cooperation with telecom operators (e.g. lower usage costs for travelers who use specific mobile services or travel with specific vendors). Furthermore, based on a developed framework for user experience of mobile trip arrangements, the results show that a well-designed mobile site and/or native application, which preferably supports integration with other mobile services, is a must for true mobile presence. In fact, travel service providers who want to build a relationship with their customers need to consider a downloadable native application, but in order to be found through the mobile channel and make contact with potential new customers, a mobile website should be available. Moreover, we have made a first attempt with cluster analysis to identify user categories of mobile services in a travel and tourism context. The following four categories were identified: info-seekers, checkers, bookers and all-rounders. For example “all-rounders”, represented primarily by individuals who use their pocket device for almost any of the investigated mobile travel services, constituted primarily of 23 to 50 year old males with high travel frequency and great online experience. The results also indicate that travel service providers will increasingly become multi-channel providers. To manage multiple online channels, closely integrated and hybrid online platforms for different devices, supporting all steps in a traveler process should be considered. It could be useful for travel service providers to focus more on developing browser-based mobile services (HTML5-solutions) than native applications that work only with specific operating systems and for specific devices. Based on an action research study and utilizing a holistic business model framework called STOF we found that HTML5 as an emerging platform, at least for now, has some limitations regarding the development of the user experience and monetizing the application. In fact, a native application store (e.g. Google Play) may be a key mediator in the adoption of mobile travel and tourism services both from a traveler and a service provider perspective. Moreover, it must be remembered that many device and mobile operating system developers want service providers to specifically create services for their platforms and see native applications as a strategic advantage to sell more devices of a certain kind. The mobile telecom industry has moved into a battle of ecosystems where device makers, developers of operating systems and service developers are to some extent forced to choose their development platforms.

Ilmavoimien taistelunjohtajan tehtäväanalyysi : tilannetietoisen päätöksenteon tarkastelu critical decision methodin avulla

Ilmavoimien taistelunjohtoalaa on tutkittu hyvin vähän. Alan tietoturvatasot ja asioiden tuottaminen kirjallisiksi ohjeiksi eivät ole vielä sillä tasolla, jolla niiden voisi toivoa olevan. Hiljaista tietoa on paljon. Menetelmävalinnan perusteella tutkimuksen tavoitteena oli luoda alan julkista teoriaa. Tutkimusstrategisina valintoina olivat laadulliset tapaustutkimus ja nelivaiheinen Critical Decision Method. Tutkimuksen tarkoituksena oli hahmottaa vaatimuksia ilmavoimien taistelunjohtajan päätöksenteon pohjaksi sekä luoda kuvaus päätöksentekoprosessista tarkastellussa tapauksessa. Päätutkimuskysymyksenä oli selvittää, millaista päätöksentekotapaa taistelunjohtaja käyttää. Tutkimus rajattiin rationaalisen ja naturalistisen päätöksenteon esiintyvyyksien vertailuun valitussa taistelunjohtotehtävässä. Alakysymyksinä selvitettiin, millaisia tunnistettavia vaatimuksia ja vihjeitä ilmenee taistelunjohtajien päätöksentekoon liittyen sekä millainen on taistelunjohtajan tilannetietoisuus tarkastellussa tapauksessa ja miten tilannetietoisuutta voidaan jälleenrakentaa tukemaan päätöksentekoa sen romahdettua. Tutkimuksessa tarkasteltiin päätöksentekoa tapauksessa observoidun kokeneen yksittäisen taistelunjohtajan haastattelujen ja tilannetietoisuuden subjektiivisten arvioiden perusteella. Tilannetietoisuutta tarkasteltiin Mica Endsleyn kolmen tilannetietoisuuden tason ja Robert Taylorin Situational Awareness Rating Techniquen kymmenen ulottuvuuden perusteella. Tutkimuksen tulokset osoittivat ilmavoimien taistelunjohtajien päätöksenteon perustuvan Gary Kleinin kehittämään tilanteen tunnistavaan The Recognition-Primed Decision -malliin. Siinä taistelunjohtaja muodostaa mentaalisen mallin ja testaa ideologian toimivuuden mielessään ennen mahdollisesti toimeenpanevaa päätöksentekoa. Toimintaa ohjaa vahvasti koulutus. Samalla taistelunjohtaja rakentaa jatkuvasti tilannetietoisuuttaan, joka nousi merkittävimpänä tekijänä esiin ilmentyen intuitiivisen päätöksenteon perustaksi. Tulokset osoittivat, että taistelunjohtajan päätöksenteko perustuu naturalistiseen päätöksentekoon, koska tehtävän hektisyyden takia ei ole aikaa vaihtoehtojen laajalle vertailulle. Tehtäväkentän laajuuden takia taistelunjohtajan päätöksenteon vaatimuksiksi ilmeni useita elementtejä. Huolimatta tehtävänaikaisesta aikapaineesta, taistelunjohtajan tilannetietoisuus oli tarkastellussa tapauksessa jatkuvasti korkealla tasolla. Tutkimuksen johtopäätöksenä voidaan todeta, että taistelunjohtajien koulutusjärjestelmä on kattava ja se toimii. Päätöksenteon koulutuksessa on kuitenkin kiinnitettävä huomiota kommunikaation merkitykseen. Siinä tilanteen tunnistamiseen johtavat vihjeet olivat epäselviä. Saatuja tuloksia voidaan hyödyntää ilmavoimien taistelunjohtajien ja taistelunjohto-opettajien koulutuksessa, valinnoissa sekä alan ohjeistusten luomisessa ja kehittämisessä.

Hand tracking in high-speed camera videos

Visual object tracking has been one of the most popular research topics in the field of computer vision recently. Specifically, hand tracking has attracted significant attention since it would enable many useful practical applications. However, hand tracking is still a very challenging problem which cannot be considered solved. The fact that almost every aspect of hand appearance can change is the fundamental reason for this difficulty. This thesis focused on 2D-based hand tracking in high-speed camera videos. During the project, a toolbox for this purpose was collected which contains nine different tracking methods. In the experiments, these methods were tested and compared against each other with both high-speed videos recorded during the project and publicly available normal speed videos. The results revealed that tracking accuracies varied considerably depending on the video and the method. Therefore, no single method was clearly the best in all videos, but three methods, CT, HT, and TLD, performed better than the others overall. Moreover, the results provide insights about the suitability of each method to different types and situations of hand tracking.

Variable speed drive in fan system monitoring

Fan systems are responsible for approximately 10% of the electricity consumption in industrial and municipal sectors, and it has been found that there is energy-saving potential in these systems. To this end, variable speed drives (VSDs) are used to enhance the efficiency of fan systems. Usually, fan system operation is optimized based on measurements of the system, but there are seldom readily installed meters in the system that can be used for the purpose. Thus, sensorless methods are needed for the optimization of fan system operation. In this thesis, methods for the fan operating point estimation with a variable speed drive are studied and discussed. These methods can be used for the energy efficient control of the fan system without additional measurements. The operation of these methods is validated by laboratory measurements and data from an industrial fan system. In addition to their energy consumption, condition monitoring of fan systems is a key issue as fans are an integral part of various production processes. Fan system condition monitoring is usually carried out with vibration measurements, which again increase the system complexity. However, variable speed drives can already be used for pumping system condition monitoring. Therefore, it would add to the usability of a variablespeed- driven fan system if the variable speed drive could be used as a condition monitoring device. In this thesis, sensorless detection methods for three lifetime-reducing phenomena are suggested: these are detection of the fan contamination build-up, the correct rotational direction, and the fan surge. The methods use the variable speed drive monitoring and control options for the detection along with simple signal processing methods, such as power spectrum density estimates. The methods have been validated by laboratory measurements. The key finding of this doctoral thesis is that a variable speed drive can be used on its own as a monitoring and control device for the fan system energy efficiency, and it can also be used in the detection of certain lifetime-reducing phenomena.

ERP implementation in SMEs : Consultant – Client Views On Critical Success Factors

ERP system is now attracting the SMEs, as it is now economical and affordable for them. The current research emphasizes on “how to make ERP successful for SMEs”. The researchers have identified various critical success factors in implementation of ERP. The research gap noticed by author is the missing point of view of ERP consultant. This thesis investigates the answer of research question “What are the critical success factors in implementation of ERP system in SMEs in opinion of ERP consultants and acquiring organizations”. The purpose of this study is to identify the highly important and less important factors. The study results will suggest the ERP managers where they have to concentrate more in order to achieve success. Literature is reviewed in order to setup a base for empirical study. Aplenty of work is found related to CSFs, SMEs and ERP. The authors and factors are organized in form of a table that tells which author is agreed upon which factor. Final result of literature review is a list of 14 CSFs. The qualitative research methodology is used to investigate the ERP in Pakistani SMEs. A case study approach is selected because of unified nature of SMEs in Pakistan. A rice mill is selected as a case because it contains maximum SME attributes. The opinion of a Microsoft certified consultant is obtained by a semi-structured interview. Similarly a semi-structured interview is conducted with CIO of SME that acquired ERP. Both the interviewees are asked about all 14 factors, whether they are agree or not and why. The collected evidences then analyzed by tabulation. The factors upon which both the participants found agreed, taken as highly important. Similarly the factors upon which both participants found disagree, taken as less important. Study results present a grid with four quadrants, the CSFs highly important in opinion of both, the CSFs less important in opinion of both, CSFs important in opinion of consultant but not client, CSFs important in opinion of client but not consultant. In discussion part, the significance of each factor is discussed individually. It is discussed that why some factors are high/less important for SMEs in Pakistan. The study output communicates a message that the success of ERP system in SMEs is linked with careful management of five important factors, the project management, top management support, user training and education, consultant participation and ERP teamwork and composition. The ERP consultants and managers can divert their concentration from less important factors such as user involvement, culture readiness and ERP package selection, toward the highly important factors. The limitations of the study are small number of interviews and less people involved, provide an opportunity for future research in this field of information system.

Energy-efficient control strategies for variable speed driven parallel pumping systems based on pump operation point monitoring with frequency converters

The pumping processes requiring wide range of flow are often equipped with parallelconnected centrifugal pumps. In parallel pumping systems, the use of variable speed control allows that the required output for the process can be delivered with a varying number of operated pump units and selected rotational speed references. However, the optimization of the parallel-connected rotational speed controlled pump units often requires adaptive modelling of both parallel pump characteristics and the surrounding system in varying operation conditions. The available information required for the system modelling in typical parallel pumping applications such as waste water treatment and various cooling and water delivery pumping tasks can be limited, and the lack of real-time operation point monitoring often sets limits for accurate energy efficiency optimization. Hence, alternatives for easily implementable control strategies which can be adopted with minimum system data are necessary. This doctoral thesis concentrates on the methods that allow the energy efficient use of variable speed controlled parallel pumps in system scenarios in which the parallel pump units consist of a centrifugal pump, an electric motor, and a frequency converter. Firstly, the suitable operation conditions for variable speed controlled parallel pumps are studied. Secondly, methods for determining the output of each parallel pump unit using characteristic curve-based operation point estimation with frequency converter are discussed. Thirdly, the implementation of the control strategy based on real-time pump operation point estimation and sub-optimization of each parallel pump unit is studied. The findings of the thesis support the idea that the energy efficiency of the pumping can be increased without the installation of new, more efficient components in the systems by simply adopting suitable control strategies. An easily implementable and adaptive control strategy for variable speed controlled parallel pumping systems can be created by utilizing the pump operation point estimation available in modern frequency converters. Hence, additional real-time flow metering, start-up measurements, and detailed system model are unnecessary, and the pumping task can be fulfilled by determining a speed reference for each parallel-pump unit which suggests the energy efficient operation of the pumping system.