Filtyp
The RF performance of vertical nanowire metal-oxide-semiconductor field-effect transistors in realistic layouts has been calculated. The parasitic capacitances have been evaluated using full 3-D finite-element method calculations, combined with self-consistent Schrodinger-Poisson calculations for the intrinsic gate capacitances. It is shown that a performance comparable to planar FETs can be achie
This paper treats the trade-off between robustness, load disturbance attenuation, and measurement noise injection for PI and PID control using Lambda, SIMC, and AMIGO tuning. The effects of measurement noise are characterized by SDU, which is a measure of noise activity analogous to the IAE commonly used to characterize performance of load disturbance response. Simple design rules to choose the fi
This paper presents an efficient numerical method to design PI controllers. The design is based on optimization of the load disturbance rejection, with constraints on the sensitivity and weighting of the set point response. Thus, the formulation of the design problem captures many aspects of industrial control problems. It leads to a nonconvex optimization problem. Efficient ways to solve the prob
The initial concept of the electromagnetic elliptical wiggler (EEW) for ELETTRA is a combination of a vertical permanent magnet to generate a wiggler field and a horizontal electromagnet to provide the possibility of switching the helicity of the X-ray radiation. The main aspects of the design of the EEW under construction for ELETTRA are discussed.
This study investigates “stiffness” optimization of path-dependent elasto-plastic structures by comparing the traditional secant stiffness formulation with a novel tangent stiffness formulation. Design updates are generated using the gradient-based Method of Moving Asymptotes (MMA), and the material behavior is modeled and limited to small-strain elasto-plasticity and isotropic hardening. Numerica
The goal of the study presented in this thesis is to evaluate the advantages and drawbacks of using powder technology in the design of the iron core of small claw-pole electric motors. The use of soft magnetic composites (SMC) and compaction technology allows the creation of complex 3D iron cores. The additional dimension opens for new solutions of the electromechanical energy conversion. A claw-p
This paper describes a design of two miniature claw-pole motors, one single phase and one two-phase motor. Both motors are designed to be built in iron powder technology. The designs are optimized and the static characteristics determined by 3D FE modeling. Both motors are being built by separate companies, but no measurements are presented in this paper. The main goal is to evaluate the industria
The paper describes and discusses the state of the art concerning the possibilities of an analytical prediction of the real fire behaviour of wooden structures and structural members. The principles of a probability based design are outlined with reference to a physical model according to Fig. 2, connected to a natxral compartment fire exposure. The design procedure is exemplified by a Swedish met
The paper considers design problems related to topological and modular design of core communication networks using integer programming techniques and multi-commodity flow models.
This work presents a methodology for analyzing and optimizing preparative chromatographic processes. It uses a model-based approach to find the critical process parameters, analyze the control space and suggest a design space that can be registered with the regulatory agencies. The methodology starts with a method for model calibration and validation. The model is then used to find an optimal oper
A systematic approach to the analysis and design of a class of large dynamical systems is presented. The approach allows decentralized control laws to be designed independently using only local subsystem models. Design can be conducted using standard techniques, including loopshaping based on Nyquist and Popov plots, H methods, and μ-synthesis procedures. The approach is applied to a range of netw
This master thesis is written in collaboration with the company Caran AB in Lund, now known as Semcon Caran AB. Semcon Caran AB is a large Swedish consulting firm who were hired by the principal LG Håkansson, an entrepreneur from Svedala. The purpose of this thesis is to design a coffee machine for use in the home environment. The thesis is written in collaboration with two other students, Sevan
