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WB1406-07: Experimental Dynamics
Responsible Instructor: D. de Klerk
Contact Hours / Week x/x/x/x: 0/0/2/2
Education Period: 3, 4
Start Education: 3
Exam Period: none
Course Language: English
Parts: The course consists of two parts:
- part A Classes
- part B Laboratory experiments (two in total)
Course Contents: Part A: Theory
- How does a modern measurement system work?? In specific how does it minimize disturbances and does it cope with filter effects?
- Pitfalls in Frequency Analysis: Descrete algorithms, Leakage, Aliasing. Know it or you"ll mess up your experements.
- The power of Transfer and Frequency Response Functions (FRF); why are they so usefull?
- Experimental Modal Analysis: Do"s and don"t, pitfalls & challenges in practice.
- Harmonic excitation (with frequency stepping), impulsive excitation, stochastic excitation.
- Experimental Dynamic Substructuring. An alternative FEM formulation which can also use experimental data.
- Rotoranalysis, operational system analysis.
- Latest advances in measurement technology.
- Transfer Path Analysis, a useful way to identify source excitation and system sensitivities.
Moto: In theory, theory and practice are the same... In practice they are not.
This course concentrates on pointing where those differences orignate from, valuable for any who"ll perform measurements, needs to analyse measurements or who tries to match his / her simulation to the experiment.
Part B: Experimental analysis
The second part of the course involves working on assigments meant to illustrate concepts described in Part A and to deepen insight.
Teams of four students each, carry out multiple experiments. Last year students got to analyse measurement data measured by them selves on my car on the Rotterdamsestraatweg. Can it be more exciting? Yes, maybe you have always wanted to analyze a different product like a boat, train, motorbike, music instrument, etc. maybe we can come up with that exciting experiment in this year"s course!
Study Goals: In general the student is able to perform dynamic measurements, being aware of possible pitfalls.
More specifically, the student must be able to:
1. describe the effects of Quantization, Leakage, Aliasing in measurements and measurement equipment.
2. explain the principle of extracting modal parameters (resonance frequency, spring constant, damping ratio) from system response both in the time domain and in the frequency domain
3. explain the principle of extracting modal parameters (modal frequencies, modal gains, modal damping ratios) from system response both in the time domain and in the frequency domain
4. discuss relative merits of different excitation techniques (shaker with frequency sweep, impact hammer, shaker with random excitation)
5. discuss the prinicples and the elative merits of different sensing techniques (strain gauge, seismic mass, piezo crystal, electromagnetic induction, laser vibrometer)
6. carry out dynamic experiments, analyze the data, and report and discuss his findings.
Education Method: Classes followed by laboratory projects.
Computer Use: Matlab
Literature and Study Materials: Course material:
- Part A: Course notes
- Part B: Laboratory assignments manual
References from literature:
- see the reference list in the Course notes.
Assessment: Written report, and oral discussion of experiment activities and of report.
Last modified: 6 November 2013, 15:25 UTC
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