Mechanical engineering is a collective concept for the art of constructing, manufacturing, utilising and maintaining the quality of mechanical equipment for specific purposes. Our research within this field at the department of mechanical engineering has the same breadth as the subject itself. We focus on six areas: structural dynamics, material science, industrial economics, terotechnology, material mechanics, and product development and design.
What happens to a structure when exposed to a load that changes over time? Within this research domain, we study the dynamic behaviours of structures in terms of performance, comfort, lifespan, noise and vibration, and how to prevent or gain control over these processes in various ways.
More on our research in structural dynamics
What happens to a structure when exposed to loads that vary in time? That is what the subject of structural dynamics is about. The structure in question may, for example, be an aircraft, a car, a house or a bridge. The load, which varies over time, can arise when an aircraft makes a manoeuvre, when a vehicle drives over a road bump or when someone walks on a bridge, but the source may also be wind, earthquakes or vibrations from a machine.
The response, that is, how the structure moves and the stresses that are created, depends on a combination of the structure's construction and the load. An unfortunate combination can cause lower precision in a manufacturing machine, discomfort to passengers, high noise levels, and shortening of the uesful life of the structure in a controlled way, but may also result in breakdowns with devastating consequences.
In order to prevent or control these processes, knowledge about the dynamic behaviour of the structure needs to be learned. Either you rely on measurements or on calculation models. Increasing focus is on calculation models, as they can be used in the early stages of the product development phase, as they allow investigation of processes that can be dangerous to perform in reality, and as they are generally cheaper than measurements on prototypes.
However, the models used must be validated – checked to match the dynamic behaviour of the actual structure. If the model is not satisfactory, measurement data can be used to calibrate, i.e, improve, the model.
Good knowledge about modelling and validation through vibration testing saves money for companies and may also be a prerequisite for being able to compete, as product development in industry is moving faster and faster.
Both experimental and analytical research
The research in the domain of structural dynamics at Linnaeus University is about modeling, vibration measurement, validation, and calibration and is carried out in collaboration with companies and other universities. We do research both experimentally and analytically.
One of the research domains is the dynamics of wind turbines, where we have started by studying the rotor blades of the turbines. A finite element model has been created to describe the dynamics of the blades. Data from vibration and material tests have been used to correlate and calibrate the model, which will be used for further research. The research also includes calibration in nonlinear structural dynamics. This is done in a research project together with Saab and Chalmers University of Technology.
The research in structural dynamics at the Department of Mechanical Engineering has a close collaboration with the Department of Building Technology and with RISE (Research Institutes of Sweden).
In material science, we study the microstructure of cast material and any impact of possible defects on the mechanical properties.
In the domain of industrial economics, we study e.g. the industry working with small and multi-storey wooden buildings. Our research focuses on market studies, product and production development, production streamlining, and development of business models and strategies, both nationally and internationally.
The research is conducted in close cooperation with the department of forestry and wood technology at Linnaeus University. Among our external partners are, for example, the Swedish University of Agricultural Sciences.
The research in this domain is based on mapping, analysis, development and control of technical and economic efficiency of a production process, using more efficient maintenance, Internet of Things (IoT), Internet of Services (IoS), and cyber-physical technologies. The work results in decreasing lifetime costs, increasing product quality and increasing profitability and competitiveness for facilities/equipment.
More on our research in terotechnology
Some of the research in the domain of terotechnology has been focused on identifying and modelling relevant information – such as lost revenue, breakdowns, production and production time, costs due to poor quality, maintenance costs, fixed and variable costs, storage and spare parts, etc. – needed to achieve the results you desire. But besides that, terotechnology can also be used in the design of new production processes, to establish an effective integration between, for example, production, quality, maintenance and production logistics. The target is then decreasing overlaps, frictions and losses, and thus lower lifetime costs (LCC).
A result of the research within the subject is MDSS, a software that will help companies reduce financial losses. This is done by mapping the production and maintenance process, following up, analyzing and controlling its results, as well as estimating the financial benefits of the maintenance in order to increase the performance of the maintenance and the production.
In material mechanics, we study how different materials deform in response to different forms of mechanical loading. For example, it includes studying the stress-strain relation of different materials, including such effects as rate-dependency and anisotropy. Furthermore, it incorporates studying the effective stiffness of composites, such as fiber-reinforced materials or porous materials. Material mechanics also includes fracture mechanics, which is the study of cracks and how these arise and grow in different materials.
Product development and design
We develop new theories in product development and product design, and study whether you can apply these theories in the manufacturing industry and in higher education.
More on our research in product development and design
Research in Product Development (PD) and Design Theory and Methodology (DTM) gives an opportunity to deep and detailed gain insight into the advances in engineering design and product development research and practice. These areas combine skills and knowledge at the core of engineering design and use advanced methods and tools which are leading on an international level. The goal is not only to develop new theoretical models, but also to study their applicability in the industry and education. The field of DTM has attracted attention of academic researchers and yielded a considerable number of results.
The main topics in our research are:
- Design theory and other disciplines: engineering sciences, material science, data science and so on.
- Design theory and industrial practice.
- Design theory and education.
- Engineering design and product development theories and tools: Conceptual phase of product design; Product architecture modelling; Modular product development; Robust design methodology; Tolerance and quality engineering; Sustainable development and LCA; Sustainable systems design.
The goal of this research is to build a reliable "bridge" between theory, reserch, education and practice in the field of PD and DTM.
- Anders Ingwald Senior Lecturer
- Andreas Linderholt Senior lecturer
- Basim Al-Najjar Professor
- Hatem Algabroun Research assistant
- Izudin Dugic Associate Professor
- Lars Håkansson Professor
- Martin Kroon Professor
- Mirka Kans Associate Professor
- Per Lindström Senior lecturer
- Tobias Schauerte Senior lecturer
- Valentina Haralanova Senior lecturer
Project: FEA of residual stresses in welded structures In this project, a versatile Eulerian plasticity is implemented and applied to the prediction of residual stresses in welded structures.
Project: Fitness For Service – Metallic Structures This project's main aim is to increase the general understanding of how the commercial operational life time of a metallic structure can be affected, …