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  • 251. Westerlund, Nils
    et al.
    Dahl, Mattias
    Claesson, Ingvar
    Adaptive Gain Equalizer for Speech Enhancement2002Report (Other academic)
    Abstract [en]

    This report presents a noise reduction method for speech communication where the input signal is divided into a number of subbands that are individually weighted in time domain according to the short time Signal-to-Noise Ratio estimate (SNR) in each subband at every time instant. Instead of focusing on suppression the noise, the method is focusing on speech enhancement. The method has proven to be advantageous since it offers low complexity, low delay and low distortion. Also, there is no need for a Voice Activity Detector (VAD). The method is stand-alone and works regardless of speech coding schemes and other surrounding adaptive systems.

  • 252. Westerlund, Nils
    et al.
    Dahl, Mattias
    Claesson, Ingvar
    In-Ear Microphone Techniques for Severe Noise Situations2005Report (Other academic)
    Abstract [en]

    Today, noise reduction methods are nearly ubiquitous although often not noticed by laymen. Cellular phones, some hands-free headsets and ear-phones offered by some airlines during long haul flights all utilize noise reduction algorithms. However, there are some situations in everyday life where ordinary noise reduction algorithms do not suffice; situations where the surrounding noise sound pressure level is too high to be efficiently attenuated by ordinary algorithms. Personal communication is then partly or totally prohibited by this noise. Examples of such situations may be motorcycle riding or attending a concert. In addition, many occupations, foremost industrial work, expose people to very high sound pressure levels. Still, these people need to be able to communicate safely. This report describes a technique where an ear-mic, i.e. a small microphone for communication purposes, is placed inside the auditory canal where it picks up bone conducted speech from the user's speech organ. The report describes three different approaches and usage areas: First, a basic approach where combination effects of an ear-mic and a pair of Active Noise Control (ANC) equipped ear-muffs are investigated. Second, this approach is used to improve a speech recognition system. The third approach is to connect a well-known noise reduction algorithm - the spectral subtraction - in cascade with the previously described ear-mic/ANC-solution in order to achieve extreme noise suppression.

  • 253. Westerlund, Nils
    et al.
    Grbic, Nedelko
    Dahl, Mattias
    Subband Adaptive Feedback Control in Hearing Aids with Increased User Comfort2006Report (Other academic)
    Abstract [en]

    This report describes important physiological and anatomical aspects of human hearing, including instruments for hearing improvements, i.e. hearing aids. One common problem with hearing aids is acoustic feedback (howling). A new subband Adaptive Feedback Control (AFC) system for hearing aids is proposed. This system detects howling by calculating distances between zero crossings in the subband input signal. A stable subband zero crossing distance measure indicates that howling is present in a particular subband. This triggers an adaptation to estimate and attenuate the feedback channel. The adaptation is driven by a probe noise sequence constrained in both time and frequency. This constraint implies increased signal quality and that user discomfort due to emitted probe noise is reduced. Also, an effective and reliable adaptation is achieved. The method has proven to operate well in computer simulations, with speech as well as music as signal input. Initial simulations indicate that an increased hearing aid gain of at least 15 dB is possible.

  • 254. Wiklund, Hans
    et al.
    Hillgren, Jon
    Strategisk miljöbedömning för hållbar regional tillväxt: om behovet av förbättrad uppföljning och utvärdering2008Report (Other academic)
    Abstract [en]

    Implementeringen av Europeiska kommissionens och rådets direktiv (2001/42/EG) om miljöbedömning av vissa planer och program och dess införande i nationell rätt har skapat ett behov av kunskap om såväl hur strategisk miljöbedömning skall och bör utföras som den faktiskt tillämpas i olika plan- och programkontexter. Uppföljning är en central del i miljöbedömning av planer och program. Idealtypiska beskrivningar av processen för miljöbedömning har ofta uppföljning som ett avslutande steg efter det att en plan eller ett program har antagits. Uppföljningens betydelse för miljöbedömningens effektivitet och trovärdighet framhålls i litteraturen. Men trots detta är kunskapen om och erfarenheten av uppföljning i miljöbedömning av planer och program begränsad. Föreliggande undersökning avser bidra till att fylla denna kunskapslucka. Den kartlägger befintliga system och rutiner för uppföljning och utvärdering inom den specifika programkontexten regional utvecklingsplanering. Mot bakgrund av resultaten diskuteras hur befintliga system och rutiner för uppföljning och utvärdering kan utvecklas för att förverkliga miljöbedömningens ambition att integrera miljö i strategiskt beslutsfattande och därigenom lägga grunden till en hållbar utveckling. Den studie som ligger till grund för rapporten har genomförts inom projektet ”Ex-post verktyg: uppföljning och utvärdering inom strategisk miljöbedömning” inom ramen för forskningsprogrammet Miljöstrategiska verktyg, MiSt som finansieras av Naturvårdsverket under tidsperioden 2003 till 2008. Programmet ”Miljöstrategiska verktyg”, MiSt, är ett tvärvetenskapligt forskningsprogram finansierat av Naturvårdsverket. Programmet leds från Blekinge Tekniska Högskola. I programmet studeras verktyg som kan underlätta miljöbedömning i strategiskt beslutsfattande på olika nivåer, från nationell till lokal. Förståelsen och basen för utveckling av verktyg och rekommendationer om verktyg i olika planerings- och beslutsprocesser baseras på empirisk forskning på fall inom flera sektorer. Målen för MiSt-programmet: • Kritisk undersökning av verktygens funktion • Teoribaserad förståelse av deras verkan • Utveckling av råd om effektiv användning av verktyg och kombinationer av verktyg Programchef: professor Lars Emmelin, Fysisk planering, BTH. Biträdande programchef: docent Tuija Hilding-Rydevik, MKB-Centrum SLU.

  • 255. Winberg, Mathias
    et al.
    Hansen, Colin
    Claesson, Ingvar
    Li, Xun
    Active Control of Engine Vibrations in a Collins Class Submarine2003Report (Other academic)
    Abstract [en]

    Submarine manufacturers invest considerable effort and money in improving the attenuation of noise radiated by submarines into the water. A number of different noise sources contribute to the total acoustic signature on an advanced submarine, such as the Collins Class. This report focuses on the problem associated with low order harmonics generated by the main diesel engines, transmitted through the engine mounts into the hull, and subsequently radiating into the water. The diesel engine mount consists of a two stage isolation system with a large intermediate mass, weighing approximately $500$ kg. Each engine is attached to the hull by eight mounts. The main intention of the work described here is to experimentally investigate the use of active vibration control to minimize the vibratory energy of the intermediate mass in all six degrees of freedom, thereby also minimizing the vibratory energy transmitted to the hull. This approach involves the use of seven inertial actuators, mounted on the intermediate mass, to produce the cancelling vibration field. A test rig, similar to one of the diesel engine mounts on the actual submarine, was constructed in the laboratory at The University of Adelaide and used for the real-time active control experiments described here. Several different set-ups were evaluated using primary vibrations with the same absolute levels and frequency content as measured on board a Collins class submarine. The controller used in the real-time experiments is based on the filtered X-LMS algorithm, which is a feed-forward algorithm working in the time domain.It is demonstrated here that active vibration control of the intermediate mass of the existing diesel engine mounts is a practical way of reducing the 1.0, 1.5 and 2.0 engine order components in the noise spectrum radiated as a result of vibration transmission through the engine mounts.

  • 256.
    Winqvist, David
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Augmenting communication channels toward the evolution of autonomous construction sites2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context

    In the last centuries, we have been generating and building infrastructure at a faster pace than ever before. Simultaneously the costs for labor and construction sectors as road and house building is increasing. This provides room for autonomous machines. The development of infrastructure is accomplished through highly efficient and productive construction machinery that progressively modernizes to form the society. In order to increase the pace of development, both cars and industry are getting more and more automated. Volvo Construction Equipment is exploring the autonomous vehicle space. The new machines complement and perfect the human work with efficiency, reliability, and durability. There is however, a question of trust between the human workers and the autonomous machines, I will in this thesis investigate methods on how to develop trust through communication systems with autonomous machines.

     

    Objectives

    To create recommendations and solutions for products that build trust between human and automated machines on a construction site.

     

    Method

    Outcome is reached through a case study exploration with validated learning, meaning that it will incorporate learnings through prototype iterations.

     

    Results

    The result evaluates how trust could be developed between humans and autonomous machinery at a construction site and how communication methods between these parties could be implemented while maintaining high levels of efficiency and safety.

     

    Conclusion

    Findings in this thesis indicates that trust is developed over time with reliable systems that provide colleagues with updated information available at any time. The results can be introduced in both today’s and tomorrow’s construction sites at various levels of advanced technology.

  • 257. Yang, Kai
    et al.
    Mfoumou, Etienne
    Kao-Walter, Sharon
    Chi, Yilin
    Experimental Study of Packaging Materials Based on Acoustic Measurements Combined with Tensile Tests2009Report (Other academic)
    Abstract [en]

    In this report, we investigated the variation between tension and fundamental frequency with respect to time, and at a constant strain rate. This was done for rectangular thin sheets under uniaxial tensile test and transverse vibration. Thin Paper (PPR), Low Density Polyethylene (LDPE) and laminate (PPR/LDPE/Al-foil) sheets were analyzed both within the elastic and plastic (which was investigated in this work) regions. The emphasis is on the linear relationship between the resonance frequency (in square) and the load.

  • 258. Ygge, Fredrik
    Power Load Management as a Multi-Commodity Market1997Report (Other academic)
    Abstract [en]

    The current report investigates the application of market-oriented programming to power load management. Power load management (or load management for short) is the management of loads at the customer side in order to manage energy systems more efficiently. As energy systems are very large and heavily distributed (typically including millions of loads in an area covering counties or countries), efficient and conceptually attractive methods are required for making load management successful. This report demonstrates how market-oriented programming can be utilized to meet the above demands.

  • 259. Ygge, Fredrik
    et al.
    Akkermans, Hans
    Duality in Multi-Commodity Market Computations1997Report (Other academic)
    Abstract [en]

    In search for general equilibrium in multi-commodity markets, price-oriented schemes are normally used. That is, a set of prices (one price for each commodity) is updated until supply meets demand for each commodity. It is well known that in a two-commodity market resource-oriented schemes are conceivable. In this paper we demonstrate the duality between price- and resource-oriented schemes in the general multi-commodity case. We also discuss important properties of the two approaches. In resource-oriented schemes the resource constraint, which says that supply must equal demand, is always fulfilled, implying that at any time the auctioneer can provide a feasible allocation. This is not the case in price-oriented schemes outside market equilibrium. In this paper we introduce a novel any-time algorithm, Proportion, for the price-oriented scheme as well, that allows the auctioneer to deliver a suitable allocation at some deadline (possibly unknown in advance) also before market equilibrium is reached. We also show how the findings for the any-time algorithms can enable more efficient price-oriented markets.

  • 260. Ygge, Fredrik
    et al.
    Akkermans, Hans
    Making a Case for Multi-Agent Systems1997Report (Other academic)
    Abstract [en]

    Multi-Agent Systems (MAS) promise to offer solutions to problems were established, older paradigms fall short. To be able to keep promises, however, in-depth studies of advantages and weaknesses of MAS solutions versus conventional ones in practical applications are needed. In this paper we offer one such study. Climate control in large buildings is one application area where MAS, and market-oriented programming in particular, have been reported to be very successful. We have therefore constructed and implemented a variety of market designs for this problem, as well as different standard control engineering solutions. This paper gives a detailed analysis and comparison, so as to learn about differences between standard versus MAS approaches, and yielding new insights about benefits and limitations of computational markets.

  • 261. Ygge, Fredrik
    et al.
    Akkermans, Hans
    On Resource-Oriented Multi-Commodity Market Computations1998Report (Other academic)
    Abstract [en]

    In search for general equilibrium in multi-commodity markets, price-oriented schemes are normally used. That is, a set of prices (one price for each commodity) is updated until supply meets demand for each commodity. In some cases such an approach is very inefficient, and a resource-oriented scheme can be highly competitive. In a resource-oriented scheme the allocations are updated until the market equilibrium is found. It is well known that in a two-commodity market resource-oriented schemes are possible. In this paper we show that resource-oriented algorithms can be used for the general multi-commodity case as well, and present and analyze a specific algorithm. The algorithm has been implemented and some performance properties, for a specific example, are presented.

  • 262. Ygge, Fredrik
    et al.
    Akkermans, Hans
    Power Load Management as a Computational Market1996Report (Other academic)
    Abstract [en]

    Power load management enables energy utilities to reduce peak loads and thereby save money. Due to the large number of different loads, power load management is a complicated optimization problem. We present a new decentralized approach to this problem by modeling direct load management as a computational market. Our simulation results demonstrate that our approach is very efficient with a superlinear rate of convergence to equilibrium and an excellent scalability, requiring few iterations even when the number of agents is in the order of one thousand. A framework for analysis of this and similar problems is given which shows how nonlinear optimization and numerical mathematics can be exploited to characterize, compare, and tailor problem-solving strategies in market-oriented programming.

  • 263. Ygge, Fredrik
    et al.
    Akkermans, Hans
    Smart Software as Customer Assistant in Large-Scale Distributed Load Management1997Report (Other academic)
    Abstract [en]

    Advanced information systems present a key enabling technology for innovative customer-oriented services by the utility industry. Real-time and two-way electronic information exchange with the customer over the power grid and other media is now possible. This provides the baseline for a host of new customer services, provided proper advantage is taken of a variety of recent advances in information technology. In this context, we discuss (a) how to engineer knowledge into systems and services, giving rise to smart software and intelligent systems, and (b) how to exploit this practically for novel ways to achieve distributed load management, dealing with thousands of devices simultaneously. A special characteristic of our concept is that the two-way information exchange for load-balancing purposes is based on market mechanisms similar to an auction. This auction is carried out by small smart software programs in devices (such as radiators) that represent and assist the customer. Field experiments with this intelligent and distributed new approach to power load management are currently performed.

  • 264. Ygge, Fredrik
    et al.
    Akkermans, Hans
    Andersson, Arne
    A Multi-Commodity Market Approach to Power Load Management1998Report (Other academic)
    Abstract [en]

    Power load management is the concept of controlling the loads at the demand side in order to run energy systems more efficiently. Energy systems are inherently highly distributed and contain large number of loads, up to some million. This implies that computationally and conceptually attractive methods are required for this application. In this paper we give two novel theorems for how to decompose general resource allocation problems into markets. We also introduce a novel multi-commodity market design to meet the demands of power load management. The approach is demonstrated to lead to very high quality allocations, and to have a number of advantages compared to current methods.

  • 265. Ygge, Fredrik
    et al.
    Astor, Eric
    Interacting Intelligent Software Agents in Distribution management1995Report (Other academic)
    Abstract [en]

    Even though distributed computing and two-way communication with the customer is becoming a reality for many energy distribution companies, there still is a need to develop methodologies for more efficient energy management. In this paper we discuss current approaches to demand management, and then present ideas from other areas applied to energy management. We introduce concepts such as computational markets and software agents in this context. In addition, methods entirely based on distributed problem solving to address the computationally hard problems of resource allocation with vast number of clients are described. We also discuss how these methods can be used to perform cost/benefit analysis of demand management.

  • 266.
    Zachén, Esbjörn
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Extraction of tool reaction forces using LS-DYNA and its use in Autoform sheet metal forming simulation2019Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In product development there is still potential to decrease lead times with faster and more accurate simulations. The objective of this thesis was to study whether Finite Element (FE) simulations using explicit LS-DYNA to extract reaction forces from sheet metal forming tools during forming, could be used to improve existing FE models in sheet metal forming software AutoForm.To begin with, the solid CAD-model of the stamping dies were meshed with tetrahedral elements in CATIA and imported into LS-DYNA. In combination with sheet mesh and milling surface meshes from AutoForm, an explicit model was realized. Contacts between sheet mesh and milling surface meshes used the so-called sheet forming contact. The resulting reaction forces were extracted and used in a simulation using the AutoForm software. Resulting simulation was compared to a scan of the physical sheet metal after forming.The direct transfer of reaction forces from LS-DYNA to AutoForm did however not result in the same pressure distribution in AutoForm. The AutoForm simulations using results from LS-DYNA were slightly worse than standard AutoForm simulations.Further work is needed to try and perhaps implement an implicit solution after an initial explicit solution.

  • 267.
    Zhang, Defeng
    et al.
    College of Mech. Eng., Quzhou University, 324000 Quzhou, China.
    Mao, Kunming
    Dassault Systemes SIMULIA Corp, West Lafayette, Indiana, USA.
    Islam, Md. Shafiqul
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Andreasson, Eskil
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. Tetra Pak Packaging Solutions AB.
    Kao-Walter, Sharon
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. Fac. of Mech. & El. Eng., Shanghai Second Polytechnic Univ., 201209 Shanghai, China.
    Powerful Modelling Techniques in ABAQUS to Simulate Failure of Laminated composites2016Report (Refereed)
    Abstract [en]

    In this study, laminated composites consisting of LDPE (Low Density Polyethylene), Al-foil (Aluminum foil)and an adhesive interface layer is focused. The defects like necking in LDPE, Al-foil layer and interfacial delaminationcan significantly impact the loading capacity of the laminated material. However, the influence mechanisms of thedefects are still unclear, and no appropriate research tool is available. Therefore, the FEM model based on alreadyavailable techniques in ABAQUS is developed in this work. The aim with the model is to create a robust numericalanalysis tool for further research work.In the modelling process, possibility of necking in substrates and interfacial delamination between material layers isconsidered. A coupled elasto-plasticity damage constitutive model, based on Hooke’s Law, the J2 yield criterion,isotropic hardening, associated flow-rule and ductile damage model, is formulated to demonstrate necking behaviorof substrates. In ABAQUS, three modelling techniques, namely VCCT, Cohesive Element, and XFEM, have been usedto simulate interfacial delamination. The simulation results are compared with the theoretical results.A uniaxial tension test consisting of a two material laminate is simulated by using these three modelling techniques.The special modelling skills for respective modelling techniques, element type, meshing technique of each model, arealso introduced. The comparison with the theoretical results shows necking in substrates and interfacial delaminationare also achieved in all three models as expected. Deformation results of the simulation are very close to that of thetheoretical analysis. Technique features of VCCT, Cohesive Element and XFEM in modelling of interfacialdelamination are analyzed and concluded. These three FEM models can all be utilized according to the requirementsof subsequent research.

  • 268.
    Zhaozheng, Wang
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Solar energy market in China -Technology andChallenge2017Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
  • 269. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Håkansson, Lars
    Lagö, Thomas L
    Claesson, Ingvar
    Investigation of the Dynamic Properties of a Milling Tool Holder2009Report (Other academic)
    Abstract [en]

    Vibration problems during metal cutting occur frequently in the manufacturing industry. The vibration level depends on many different parameters such as the material type, the dimensions of the workpiece, the rigidity of tooling structure, the cutting data, and the operation mode. In milling, the cutting process subjects the tool to vibrations, and having a milling tool holder with a long overhang will most likely result in high vibration levels. As a consequence of these vibrations, the tool life is reduced, the surface finishing becomes poor, and disturbing sound appears. In this report, an investigation of the dynamic properties of a milling tool holder with moderate overhang has been carried out by means of experimental modal analysis and vibration analysis during the operating mode. Both the angular vibrations of the rotating tool and the vibrations of the machine tool structure were examined during milling. Also, vibration of the workpiece and the milling machine was examined during cutting. This re- port focuses on identifying the source/sources of the dominant milling vibration components and on determining which of these vibrations that are related to the structural dynamic properties of the milling tool holder.

  • 270. Åkesson, Henrik
    et al.
    Smirnova, Tatiana
    Lagö, Thomas L
    Håkansson, Lars
    Analysis of Dynamic Properties of Boring Bars Concerning Different Clamping Conditions2007Report (Other academic)
    Abstract [en]

    The boring bar is one of the most widely used type of tool holders in metal cutting operations. The turning process subjects the tool to vibrations, and cutting in deep workpiece cavities is likely to result in high vibration levels. The consequences of such vibration levels generally results in: reduced tool life, poor surface finishing and disturbing sound. Internal turning frequently requires a long and slender boring bar in order to machine inside a cavity, and the vibrations generally become highly correlated with one of the fundamental bending modes of the boring bar. Different methods can be applied to reduce the vibrations, the implementation of the most efficient and stable methods require in depth knowledge concerning the dynamic properties of the tooling system. Furthermore, the interface between the boring bar and the clamping house has a significant influence on the dynamic properties of the clamped boring bar. This report focuses on the dynamic properties of a boring bar that arise under different clamping conditions of the boring bar and are introduced by a clamping house (commonly used in the manufacturing industry). The dynamic properties of a boring bar (for different cases of boundary condition of the boring bar) are presented partly analytically but also experimentally.

  • 271. Öresjö, Eva
    Råslätt. Igår-idag-imorgon. En retrospektiv studie i ett storskaligt miljonprogramsområde1996Report (Other academic)
    Abstract [sv]

    En solig aprildag 1973 besökte jag för första gången förortsområdet Råslätt i Jönköping. Besöken har därefter varit otaliga liksom kontakterna med olika grupper av Råslättsbor och Råslättsverksamma. I närmare åtta år efter detta, mitt första besök, hade jag en kontinuerlig och fortlöpande kontakt, dels genom mitt avhandlingsarbete, dels som projektsekreterare i Bostadssociala delegationens för-söksverksamhet i området, dels genom ett utredningsuppdrag för fritidsförvaltningen i Jönköpings kommun. Därefter gick det 7 år innan jag en gråmulen septemberdag 1988 ånyå besökte Råslätt. Det var vid det tillfället, som idén väcktes att vända åter för att i en retrospektiv studie beskriva och analysera det arbetsätt som utvecklats på lokal områdesnivå och som de, som jag sammanträffade med, uppfat-tade som så positivt för utvecklingen i området. Av olika skäl skulle det dock dröja ytterligare drygt fyra år innan idén från 1988 kunde omsättas i ett konkret forskningsarbete. Under de senaste två åren har så Råslätts utveckling ånyå upptagit mitt intresse. Resultatet av detta arbete finns redovisat i denna rapport, där Råslätts historia är tecksnad alltsedan de första besluten fattades att exploatera Råslätts Gård för bostadsbebyggelse. Men den nu föreliggande rapporten visar också att 80-talets positiva utvecklingsspiral har brutits. Hos mig som forskare väcker det frågor kring välfärdsuppbyggnad och bostadssociala kvaliteter, om strukturellt betingad arbetslöshet och etnisk segregering. Även i fortsättningen kommer därför Råslätt att vara en följeslagare i mitt forskningsarbete. Jag kommer ånya att intervjua de som bor och de som arbetar i området och som alltid välvilligt ställt sin tid till mitt förfogande. Ett varmt tack till Er alla, som hjälpt mig att genomföra mitt forskningsarbete!

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