| Scope and form: Lectures, discussions, exercises and laboratory demonstrations |
Evaluation: Approval of coursework/reports
Evaluation of written report of a selected subject |
| Examination: Pass/fail |
| Prerequisites: The participant is expected to have basic knowledge in acoustics and structural vibration (structure-borne sound) |
| Participant limitation: Max. 9 |
| Aim: The aim of this course is to provide the student with an advanced level of knowledge and understanding of vibro-acoustic problems that involve sound waves in engineering structures at audible frequencies. |
| Contents: Among the topics being covered are: In-plane waves and bending waves in plate and shell-type structures; point and wave impedances and mobilities; attenuation of wave fields caused by changes in cross-section, by elastic inter-layers and by cross members (branches); characteristics of spatially periodic structures; damping due to internal dissipation losses, attached layers and other damping mechanisms; structureborne sound intensity in plates and power transmission in multi-point coupled systems; sound radiation from bending wave fields in structures. The methods of analyses and calculations include analytical methods based upon wave approaches and on Fourier transform techniques (wave number spectrum), and on statistical energy analysis (SEA) in cases of broad band excitation of complex, built-up structures. Numerical methods include vibration analysis with finite element method (FEM) and sound radiation predictions with the boundary element method (BEM). |
| Remarks: At the end of the two-week period the participant defines a major exercise for final evaluation, and submits a written report on the subject within one month. |
| Contact: Mogens Ohlrich, building 352, (+45) 4525 3959, mo@oersted.dtu.dk |
| Department: 031 Ørsted DTU |
| Keywords: Structureborne sound, Vibro-acoustics, Vibration control, Sound radiation |
Signup: Hos lfreren/At the teacher
Signup deadline: jan 04 2002 |
| Updated: 27-04-2001 |
