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Anna-Karin Christiansson

Senior Lecturer

Docent i Produktionsteknik

anna-karin.christiansson@hv.se

+46520223268

M1-208

Organization

Staff member at Division of Industrial automation. Conducts research in engineering and technology, production technology.

Research area/research interest

My research focuses on measurement and control systems for production processes. The purpose is to acquire process understanding and to facilitate model verification and process control through reliable sensors that capture relevant process information. Experimental studies are performed on different manufacturing processes at PTC in cooperation with process expertise with process understanding. The aim of the research is to develop control functions for robust behaviour during varying conditions.

The additive manufacturing process is of special interest. When performing additive manufacturing, completely new components are produced by melting metal wire using welding technology. Layer upon layer of melted wire is deposited until the desired shape is reached.

Teaching/supervision

I am supervising PhD-students in production technology with special interest in issues regarding welding automation. I have long experience of teaching feedback control and electrical technology in engineering programs.

Keywords

Welding automation, non-contact measurement, feedback control, measurement systems for welding

Publications

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Research projects

Ongoing and finished projects

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Anna-Karin Christiansson

Organization

Research area/research interest

Teaching/supervision

Keywords

Monitoring and control of directed energy deposition using a laser beam

Experimental validation of an inductive probe for narrow gap measurement based on numerical modelling

Investigation of effects from realistic influences on inductive gap measurement

Robust vision-based joint tracking for laser welding of curved closed-square-butt joints

Detecting beam offsets in laser welding of closed-square-butt joints by wavelet analysis of an optical process signal

Joint tracking in zero gap laser beam welding using a vision sensor

Automation of a laser welding system for additive manufacturing

Sampled-data H∞-control for time-varying hybrid systems

Low order sampled-data H∞ control

Resistance based iterative learning control of additive manufacturing with wire

Automatic detection of material phase transitions from spectroscopic data

Emissivity compensated spectral pyrometry for varying emissivity metallic measurands

Investigation of path compensation methods for robotic friction stir welding

Height control of laser metal-wire deposition based on iterative learning control and 3D scanning

Automation of laser metal deposition for the manufacture of fully dense structures

Model order reduction methods applied to a welding model

A unified framework for mixed continuous/discrete-time H_infinity -control

Analysis and evaluation of a general camera model

Control Design for Automation of Robotized Laser Metal-Wire Deposition

Automation of a robotised metal deposition system using laser melting of wire

Automatic Generation of Multivariable Sampled-data Controllers for Jet-engines

3D-Scanning for Weld Distortion Measuring

Accuracy Investigation of a Vision Based System for Pose Measurements

Simulated Feedback Control of Metal Fusion Welding

Automation of Robotized Laser Metal-Wire Deposition

In-process spectroscopic detection of chromium loss during Directed Energy Deposition of alloy 718

A study on change point detection methods applied to beam offset detection in laser welding

Adaptive control of the filler wire rate during laser beam welding of squared butt joints with varying gap width

In-process Monitoring and Control of Robotized Laser Beam Welding of Closed Square Butt Joints

Monitoring of Varying Joint Gap Width During Laser Beam Welding by a Dual Vision and Spectroscopic Sensing System

Model based feedback control of gas tungsten arc welding : An experimental study

Low order sampled data H∞ control using the delta operator and LMIs

Continuous-, discrete- and sampled-data- H∞ control - a unified framework

Mixed continuous/discrete-time output feedback H∞ control : A unified approach

Resistance measurements for control of laser metal wire deposition

Emissivity compensated spectral pyrometry-algorithm and sensitivity analysis

Emissivity estimation for high temperature radiation pyrometry on Ti–6Al–4V

A local model for online path corrections in friction stir welding

Automatic in-process control of laser metal-wire deposition based on sensor feedback

Friction stir welding with robot for light vehicle design

Role of fixture forces on distortion in gas tungsten arc welding : An experimental and modelling approach

Camera Modelling and Calibration - with Applications

Off-Line Simulation of Advanced Stereo Vision Welding Applications

Increased stability in laser metal wire deposition through feedback from optical measurements

Sensor and control system for metal deposition using robotised laser welding.

A new Camera Model and Algorithms for higher Accuracy and better Convergence in Vision-based Pose Calculations

A new Camera Model for Higher Accuracy Pose Calculations

Modelling and Simulation for Feedback Control of Welding

Simulation for Design of Automated Welding

Freeform Fabrication using Laser Metal-wire Deposition

Research projects

Sampled-data H∞-control for time-varying hybrid systems

Continuous-, discrete- and sampled-data- H∞ control - a unified framework