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51270 Sound and Vibration
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Danish title: Lyd og vibrationer
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| Type: Å, Language: EED |
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Credit points:
5 point |
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| | | Previous course: C5170 |
| Offered by:
Department of Acoustic Technology
(AT) |
| No credit points with: C5170 |
| Prerequisite: 51001/C5101 |
| Recommended semester:
7th - 9th semester |
| Scope and form: Lectures, two afternoon excercises and review of written exercises. |
| Examination:
Approval of compulsory activities is a prerequisite for taking part in the ex. Written exam
(13 point scale
) |
| Remarks: The course is aimed at students who, having followed a basic course in acoustics, wish for a more advanced understanding of sound and vibration, its generation, propagation and attenuation. The course is a natural introduction to a master thesis work. |
| Contact person: |
Mogens Ohlrich, AT, Building 352, Tel. +45 4525 3959 |
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| Aim: By introducing the principles and laws governing the generation, transmission and radiation of structureborne sound, it is the purpose of the course to enable the student to: a) analyse vibro-acoustic systems, eg technical noise and vibration problems, b) make practical proposals for reducing structureborne noise in cabinets, machines, vehicles, buildings, etc., and c) apply advanced measurement techniques for verifying theoretical calculations. |
| Contents: Mechanisms for the generation of vibration and sound in structures. Simple oscillators and models for damping mechanisms. Concepts of mobility and mechanical impedance. Vibro-acoustic measurement techniques. Introduction to applied signal analysis (spectral analysis, estimation of transfer functions, etc). The generation of vibration and sound waves in solids and structures (structureborne sound). Longitudinal waves and bending waves in beams and plates. Analytical and statistical methods for calculating structureborne sound and transmission in complex structures. Vibration isolation, attenuation and damping of structureborne sound in equipment and machinery. Sound radiation from vibrating structures (plates, cylinders, cabinets, etc). Active control and damping of vibration and sound radiation. Principles for altering the transmission and radiation properties of structures. |
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