stillingsbetegnelse:
Postdoc in Contact Mechanics and Wear in Structural and Machine Components

jobbeskrivelse:
Applications are invited for a 3-year postdoc position starting in March 2015, within the field of modeling of dynamic interaction between structural and machine components at the Department of Mechanical Engineering, Technical University of Denmark (DTU). The position is funded through the Innovation Fund Denmark – Research, Technology & Growth. Responsibilities and tasks With the research activities linked to the project we aim at significantly improving the safety, reliability and operational lifetime of the 3500 switches and crossings (S&Cs) in the Danish railway network. The project is a close cooperation between the Technical University of Denmark (DTU), the Danish rail infrastructure provider Rail Net Denmark and four affiliated European partners with significant expertise within this field. An inter-disciplinary scientific effort is employed to obtain enhanced rail transport reliability and regularity simultaneously with significant savings in S&Cs maintenance costs. The project results will make maintenance based on intelligent fault prediction tools, instead of the presently used regular planned inspections, and it will provide sophisticated tools to prevent hidden faults from developing to failure in the future. The project will install state-of the-art sensor technology in selected S&Cs and correlate dynamic parameters during train passage with static geometry data from conventional measurement vehicles. Monitoring of the dynamic responses will provide diagnosis of patterns that indicate when components or ballast begin to deviate from fully functional conditions. Modelling of dynamics will identify root causes to signs of degradation. Damage assessment of components identified by anomalous readings will be done by metallurgical examinations. Data and results will be processed by a holistic model that can produce Maintenance Performance Indicators (MPI) for the S&C condition. The focus of the activities is the development of simulation models based on the state-of-the-art computational tools for showing how incipient and abrupt faults will change the system dynamic responses. Holistic models on the macro and micro scales will give insights into stress, deformation (strain) and accelerations experienced by the various parts of S&Cs during train passage with a high level of fidelity. After experimental validation such computer models will be used to advance our understanding of the complex interaction among all subsystems under nominal and critical operation conditions. The calculated responses will be functions of the overall condition of the S&C, and of its individual components and geometrical properties, as well as train mass and passage velocity. When components become worn out and plastically deformed, the calculations will in principle show how incipient and abrupt faults will change the dynamic responses during train passage. The modelling is expected yield the following results: (a) development of a holistic mathematical model that can describe soil-ballast-sleeper-pad-rail-wheel dynamic interactions; (b) identify parameters which are signs of degradation; (c) Provide guidelines on how to best avoid faults from developing. Research with some teaching. It may also involve handling other assignments to a limited extent. Qualifications Candidates should have a PhD degree or equivalent. Further qualifications: •Multibody Dynamics & Contact Mechanics •Finite Element Modeling •Numerical methods applied to complex dynamic systems •Experimental methods & dynamic testing of structural/machine components Moreover the candidate shall have additional skills as: •Ability to work independently, to plan and carry out complicated tasks, and to be a part of a large, dynamical group •Good communication skills in English, both written and spoken •Industrial and academic experiences with design and test of structural/machine components are highly appreciated. •Instrumentatio

Arbejdsgiver Navn: Danmarks Tekniske Universitet

Arbejdsgiver telefonnummer: 45252525

Arbejdsgiver faxnummer: 45881799

Job kort beskrivelse:
Undervisning og forskning på universiteter og højere læreranstalter

land: Danmark

region: Hovedstaden

krævede uddannelse: Ikke angivet

Kilde til jobtilbud: AMS, Offentlige arbejdsformidlinger, Danmark