This study examines the use of building modeling and energy simulations in the design process  of  a  building.  The  take-off  point  is  the  notion  of  energy  simulations  being needed early and throughout the building design process, and that the lack of energy simulations may be explained by the fact that they are time consuming and therefore often too expensive. A greater interoperability between software tools used by relevant disciplines,  such  as  the  architect  and  the  energy  specialist,  would  create  smoother workflows, which would reduce this cost and open up for more frequent and iterative energy  simulation  processes.  The  study  is  an  assessment  of  the  modeling  tool  Revit and  the  simulation  tool  Virtual  Environment  and  whether  they  can  create  smoother workflows, and make leeway for a more frequent use of energy simulations throughout the  design  process.  It  also  investigates  the  limitations  of  what  can  be  examined  by simulations in Virtual Environment. This will hopefully help clarify the future role of energy  simulations  in  design  processes.  The  method  is  a  trial  by  error  approach  of testing the two software tools by building and simulating a model. The results of these tests  show  that  the  workflow  is  not  optimal  (and  therefore  time  consuming)  for frequent  and  iterative simulations  throughout the  design  process,  but  it  also  reveals some  great  possibilities  of  what  can  be  performed  with  these  two  powerful  tools  at hand.  Further  development  with  regards  on  platform  independency  of  the  building information  model,  including  seamless  exporting  and  importing,  seems  necessary  to strengthen the future role of energy simulations..

A key part in the development and verification of digital systems is simulation. But hardware simulators are expensive, and software simulation is not fast enough for designs with a large number of gates. As today?s digital zesigns constantly grow in size (number of gates), and that trend shows no signs to end, faster simulators handling millions of gates are needed. We investigate how to create a software gate-level simulator able to simulate a high number of gates fast.

This thesis of 15 hp has been implemented at Halmstad University, in collaboration with Saab Dynamics in Linköping. Saab Dynamics is a company operating in the defence industry where competition is tough. This necessitates new ways to increase efficiency in the company, which is the basis for this thesis. Saab Dynamics wants to introduce simulation driven design. Since Saab Dynamics engineers have little experience of simulation, required a user methodology with clear guidelines.

This thesis of 15 hp has been implemented at Halmstad University, incollaboration with Saab Dynamics in Linköping. Saab Dynamics is a companyoperating in the defence industry where competition is tough. This necessitatesnew ways to increase efficiency in the company, which is the basis for this thesis.Saab Dynamics wants to introduce simulation driven design. Since SaabDynamics engineers have little experience of simulation, required a usermethodology with clear guidelines. Due to lack of time, they chose to assign thetask to students, which resulted in this thesis.The aim of the thesis is to develop a methodology in mechanical design, wherethe designer uses the FE analysis early in the design process to develop thestructures' mechanical properties.

This thesis has been a part of Forsmarks Kraftgrupp AB's evaluation of a turbulencemodel used in simulation of turbulent flow called PRNS (Partially Resolved NumericalSimulation). This model has promising properties and may be of use in savingcomputational resources. The purpose of this thesis was to analyze this model andcompare it with industrially applied models such as k-omega SST and LES (Large EddySimulations).PRNS works as a hybrid of the k-omega SST and DNS (Direct Numerical Simulation)where a constant, RCP (Resolution Control Parameter) with a value between 0 and 1are selected. This constant is then used in the calculations and determines thebehavior of the simulation. When RCP is set to zero the equation are the same as fora DNS simulation and when RCP is set to one the equations for k-omega SST issolved.

Den här rapporten beskriver arbetet med att skapa en dynamisk designdriven webbsida åt Landegrens Legomek AB, ett mindre företag inom tillverkningsindustrin. Företaget hade sedan tidigare en statisk webbsida och ville förnya denna i takt med den ökade vikten av att synas på Internet. Design och layout är anpassad till företages profil och kunder för att ge ett seriös och formellt intryck. Vi har valt att skapa den nya webbsidan med databasservern MySQL och skriptspråket PHP. Även JavaScript är en del i implementeringen.

This thesis of 15 hp has been implemented at Halmstad University, in collaboration with Saab Dynamics in Linköping. Saab Dynamics is a company operating in the defence industry where competition is tough. This necessitates new ways to increase efficiency in the company, which is the basis for this thesis. Saab Dynamics wants to introduce simulation driven design. Since Saab Dynamics engineers have little experience of simulation, required a user methodology with clear guidelines.

To enable the enhancement of the driver's environment in a forklift, an alternative form of steering has been evaluated. An earlier concept with a combined driving and steering wheel has been exchanged to a concept with two driving wheels. A link wheel has replaced the combined driving and steering wheel. The steering is done through differentiation of the velocities of the two driving wheels. The scope of this master thesis is to create a simulation model, create a control program and to evaluate the concept of two driving wheels.

AbstractConsider a ?uid being heated from below. The heating leads to an upward convectiveforce that is counteracted by the viscous forces of the ?uid. If the convectiveforce is large enough in comparison to the viscous forces the ?uid will be put in anunstable state.

Friytande bilpooler tillåter envägsresor med start och slut vid vilken parkeringsplatssom helst inom ett avgränsat driftområde, vanligen en stadskärna. Till skillnadfrån traditionella bilpooler, vari bilar alltid ska återlämnas där de hämtats, finns riskatt fordon blir olämpligt fördelade. Driftoptimering genom dynamisk prissättning utvecklades i detta arbete med målet att möjliggöra ett kostnadsffektivt sätt att säkerställa tillgänglighet av fordon, och därmed lönsamhet, i friytande bilpooler.Två modeller för dynamisk prissättning utvecklades, samt implementerades i en prototyp av en IT-lösning för friytande elbilspooler. Grunden till den första modellenutgjordes av en verifierad modell för kostnadsminimering av stationsbaserade bilpooler med envägsresor. Modellen är baserad på MILP och hämtades ur Alvina Keksavhandling Decision support tools for carsharing systems with exible return time and stations (2006).

Människan ställs dagligen inför en mängd beslut. Att fatta beslut i dynamiska eller naturliga miljöer ställer höga krav på människan. Det är ofta mycket som står på spel, problemen är dåligt strukturerade, miljön är föränderlig och besluten måste fattas under tidspress. När flera personer ska beslut tillsammans kan beslutsfattandet organiseras på olika sätt t.ex. genom en demokratisk eller en hierarkisk organisationsstruktur.

AbstractConsider a ?uid being heated from below. The heating leads to an upward convectiveforce that is counteracted by the viscous forces of the ?uid. If the convectiveforce is large enough in comparison to the viscous forces the ?uid will be put in anunstable state.

På kort tid har priset på kopparmarknaden stigit kraftigt de senaste åren. Industriföretag med stora kopparinköp men fasta försäljningspriser på sina produkter kan i dessa fall få försämrade marginaler om de inte säkrar priset på sina inköp av koppar. I ett svenskt industriföretag säkras idag 80 procent av kopparinköpen, kvartalsvis. Syftet med denna undersökning är att studera om en dynamisk prissäkringsstrategi, där andelen som prissäkras bestäms utifrån prognostiserad volatilitet, ger en mer stabil volatilitet av inköpspriser än den statiska strategin som idag används av industriföretaget.Resultatet av undersökningen visar att en dynamisk prissäkringsstrategi, där volatiliteten prognostiseras med hjälp av GARCH-modeller, inte ger en mer stabil varians än den statiska strategi som idag används. Detta har sin grund i att GARCH-modellerna inte lyckas prognostisera volatiliteten tillräckligt bra.

This thesis of 15 hp has been implemented at Halmstad University, incollaboration with Saab Dynamics in Linköping. Saab Dynamics is a companyoperating in the defence industry where competition is tough. This necessitatesnew ways to increase efficiency in the company, which is the basis for this thesis.Saab Dynamics wants to introduce simulation driven design. Since SaabDynamics engineers have little experience of simulation, required a usermethodology with clear guidelines. Due to lack of time, they chose to assign thetask to students, which resulted in this thesis.The aim of the thesis is to develop a methodology in mechanical design, wherethe designer uses the FE analysis early in the design process to develop thestructures' mechanical properties.

This master thesis consists of the creation of shock absorber models for percussive rock drills. A model of the rock was also developed. These models were connected to existing models of the rock drill to create a complete simulation of the rock drilling process.When the models had been created the rock model was evaluated by comparison with measured values from lab tests. The verified rock model was then used to evaluate the shock absorber models.Four new shock absorber concepts have been developed. Three of these have been modelled, while the fourth have only been sketched and described.The evaluation of the models showed the following:? Simulations of the single shock absorber don?t correlate to reality very well.