Diploma Thesis Project
Siemens AB / Maskiningenjörsjobb / Finspång
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hela Sverige What does the Diploma Thesis entail?
The aim of the study is the development and application of new approaches for the analysis of the vibration characteristics of bladed disks under different conditions, based on the Blade Tip Timing method (BTT). This research and development effort will be shared between the departments of Vibration & Acoustic and Structural Dynamics of Siemens.
Blade Tip Timing is a set of non-contact vibration measurement methodologies, based on the identification of the time of arrival of a blade tip under a static sensor. Schematically the role of tip timing measurements in gas-turbine engine vibration monitoring is shown below.
A well-known drawback of BTT is frequency aliasing. This is due to the low sampling rate, which is equal to the rotor speed for each probe. This drawback means that the data is effectively sampled non-uniformly. In the case of asynchronous vibrations (i.e. vibrations with a frequency that is not a multiple of the rotation speed) the vibration is measured at different phase angles at each revolution. If the measurement time is long enough, a complete picture of the vibration will eventually be captured but not in the correct order.
The digital signal processing research community has developed a number of anti-aliasing methods for non-uniformly sampled data. It has been shown that a band-limited signal can be uniquely determined from non-uniform samples, provided that the average sampling rate exceeds the Nyquist rate. Such approaches can be applied to solve the BTT aliasing problem.
Work Plan
A previous diploma thesis carried out a thorough initial investigation of several different methods for the analysis of BTT data. The successful candidate will:
• Investigate if the methods have been properly implemented.
• Identify the promising methods among the ones already studied.
• Carry out further development and refinement of these methods.
• The ultimate goal would be a complete methodology that can accurately and efficiently identify both synchronous and asynchronous blade vibrations for any bladed assembly.
It is required that the findings are documented in a thesis report (English language). Submission of results to a conference will be appreciated. Furthermore, the findings will be presented in a seminar internal to the company at the end of the work.
What do I need to qualify for this job?
• Good knowledge of structural dynamics and vibrations
• Understanding and implementation of digital signal processing methods
• Matlab/Python programming
• Experience with finite elements methods and software
• Elements of aeromechanics and flow dynamics
Siemens is a global powerhouse in electronics and electrical engineering, actively operating in more than 200 countries. We're offering a wide range of pioneering products for energy efficiency, industrial productivity, affordable healthcare and intelligent infrastructure, with a quickly growing focus on sustainability.
Put simply, we have something for everyone. Few other organizations can offer such a diverse mix of opportunities. Your experience is a key to our success and can be used in a variety of ways to develop your career in whatever direction you choose, from entry level through to experienced and specialist roles. Diversity improves competitiveness by enlarging the potential for ideas and innovation, one of Siemens' key principles. It is therefore a business imperative and Siemens is fully committed to being an equal opportunities employer.
Publiceringsdatum2017-02-01Så ansöker duSista dag att ansöka är 2017-02-14
Ange följande referens när du ansöker: 247292
Klicka på denna länk för att göra din ansökanKontaktVsevolod Kharyton 0122-87995
FöretagSiemens AB
AdressSiemens AB
Slottsvägen 2-6
61231 FINSPÅNG
KontorsadressSlottsvägen 2-6
Jobbnummer 3294276
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