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SD2150 Experimental Structure Dynamics, Project Course 9.0 credits

Experimentell strukturdynamik, projektkurs

Industrial designers and engineers often need to analyse how machines, vehicles etc respond to dynamic excitation forces. The purpose may be to improve an existing design or to get valuable knowledge to develop a new design. Analysis of this kind has been made possible by the rapidly developing digital computing and measurement techniques. In the latter half of the 20th century methods like the Finite Element Analysis and the Experimental Modal Analysis were developed and became popular engineering analysis tools. Experience has shown, however, that reliable results from these methods require the user to be able to use the methods critically and to carefully consider the limiting assumptions.

The main purposes of this course are to provide you with theoretical knowledge as well as practical experience such that you are well prepared for future work with experimental structure dynamics.

  • Education cycle

    Second cycle

  • Main field of study

  • Grading scale

    A, B, C, D, E, FX, F

Course offerings

Spring 19 for programme students

Spring 20 for programme students

Intended learning outcomes

After reading the course you shall,

  • be able to analyse a real engineering problem using experimental modal analysis.

More specifically you shall be able to,

  • account for details as well as the overall structure in the principles of experimental structure dynamics,
  • choose an appropriate physical model to represent the test object,
  • define and measure the input data required for the analysis,
  • account for and use graphical and numerical curve-fitting techniques to extract structure dynamic model parameters,
  • use an appropriate advanced model parameter extraction method implemented in a commercial software,
  • illustrate the analysis results, i e the structure dynamic model,
  • judge the reliability of the analysis results consciously and critically and
  • report the results in a written report.

Course main content

Part 1. Theory: Theoretical basis. Measurement and analysis of dynamic properties of mechanical structures. Analytical and numerical methods to determine the modal parameters of mechanical structures.

Applications: Analysis of forced motion. Analysis of coupled structures. Sensitivity analysis. Structural modifications.

Computer exercise: Determination of beam vibration modes from experimental data.

Part 2. Laboratory exercise and project exercise: Instrumentation and experimental setup. Methods for data acquisition. Measurement of mobility functions. Estimation of frequency modal parameters. Evaluation and presentation of modal results.

Test structures: Reference object, perspex plate. Structure from industry.

Eligibility

Basic courses in mathematics, mechanics.

Literature

Carlsson, U. Experimental Structure Dynamics.

Examination

  • LABA - Computer and Laboratory Excercises, 3.0, grading scale: P, F
  • LABB - Project, 3.0, grading scale: P, F
  • TENA - Oral Examination, 3.0, grading scale: A, B, C, D, E, FX, F

Requirements for final grade

Oral examination (TEN1; 3 university credits).
Approved laboratory exercise (LAB1; 3 university credits).
Approved project exercise (LAB2; 3 university credits).

Offered by

SCI/Aeronautical and Vehicle Engineering

Examiner

Hans Bodén <hansbod@kth.se>

Add-on studies

SD2165 Acoustical Measurements
SD2155 Flow Acoustics
SD2160 Sound and Vibration, Project Course
SD2170 Energy Methods
SD2175 Numerical Methods for Acoustics and Vibration
SD2180 Non-Linear Acoustics
SD2185 Ultrasonics
SD2190 Vehicle Acoustics and Vibration

Version

Course syllabus valid from: Autumn 2018.
Examination information valid from: Spring 2013.