Modelling and experimental validation of dynamic impact in 1:9 railway crossing panel

To improve the understanding of dynamic impact in 1:9 crossing panel, which is suffering from rapid surface degradation, detailed modelling and experimental studies are performed. A three-dimensional explicit finite element (FE) model of a wheel rolling over a crossing rail, that has an adaptive mesh refinement procedure coupled with two...

Stochastic DSMC method for dense bubbly flows: Methodology

A stochastic Direct Simulation Monte Carlo (DSMC) method has been extended for handling bubble-bubble and bubble-wall collisions. Bubbly flows are generally characterized by highly correlated velocities due to presence of the surrounding liquid. The DSMC method has been improved to account for these kind of correlated collisions along with a...

Experimental and numerical investigation of contact heat transfer between a rotating heat pipe and a steel strip

A new concept for energy efficient annealing of steel strip comprises of multiple rotating heat pipes. Each heat pipe extracts heat from the cooling strip which is reused to increase the temperature of the heating strip. In this context, the heat transfer between the steel strip and the rotating heat pipe is investigated. When the strip is...

String-stable automated steering in cooperative driving applications

The ever-increasing road transport demand in the developing and the developed world has resulted in road-traffic networks nearing maximum capacity. Traditional approaches to this problem, such as increasing road capacity, do not offer long-term solutions. Combined with rising environmental concerns, the demand for smarter solutions has never...

Validation of the Calculation Models and Design Tools for Steel Beam-Column Joints by Experiments and FEA

New technologies (like 3D printing) and the increasing use of no conventional materials (like Fiber Reinforcement Polymer - FRP) are changing the construction industry. More effective and efficient structures are needed in order to achieve sustainable projects. Steel construction industry is not outside this modifications and advances. To keep...

Generic and complete vehicle dynamic models for open-source platforms

Vehicle dynamics models are important tools for research and development within the automotive industry. The need for such models is steadily rising due to the rapid development of automated driving, as these models allow efficient design and development of the control algorithms and functions. Chalmers Revere Lab supplements research in the...

Comparison of Nested-Loop Rotors in Brushless Doubly-Fed Induction Machines

The brushless doubly-fed induction machine (DFIM) has great potential as a variable-speed generator for wind turbine applications. This special machine has a richer space-harmonic spectrum due to its special nested-loop rotor construction compared with conventional induction machines. It may result in higher iron losses, higher torque ripple and...

Finite Element Analysis and Experimental Validation of Eddy Current Losses in Permanent Magnet Machines with Fractional-Slot Concentrated Windings

Permanent-magnet machines with fractional slot concentrated windings are easy to manufacture. Their popularity therefore is steadily increasing. Without a proper design, however, the induced eddy-current losses in the solid rotor get rather high. The modeling and the prediction of eddy-current losses for these machines are thus very important...

Thermomechanical modelling of a hydrostatic machine tool spindle

Development of high precision machine tools enables the industry to continuously tighten tolerances and surface finish quality demands. Controlling the thermal state of the machine and process has become the dominant challenge for machine tool manufacturers. Defining models that predict the thermally induced deformations is an important aspect...

Finite-element analysis of post-tensioned SG-laminated glass beams with mechanically anchored tendons

Based on past experimental research results, this paper aims to investigate the structural performance of laminated glass beams with post-tensioned, mechanically anchored tendons, via extended finite-element (FE) simulations. The post-tensioned glass beam concept offers the advantage of providing a certain amount of initial compressive stresses...

Free-surface flow simulations for moored and floating offshore platforms

During the development of the ComFLOW simulation method many challenges have to be tackled concerning the flow modelling and the numerical solution algorithm. Examples hereof are wave propagation, absorbing boundary conditions, fluid–solid body interaction, turbulence modeling and numerical efficiency. Some of these challenges will be discussed...

Design and thermal testing of smart composite structure for architecture applications

A composite structure consisting of a Shape Memory Polymer (SMP) matrix and three Shape Memory Alloy (SMA) strips was constructed. The SMA strips act as actuators which create forward and backward angle bends of 90 degrees of the composite structure. The function of the polymer matrix was to give the structure enough stiffness. During the...