SD2180 Ickelinjär akustik 6,0 hp

Non-linear Acoustics

The course covers the fundamentals of non-linear acoustics.

  • Utbildningsnivå

    Avancerad nivå
  • Huvudområde

  • Betygsskala

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

Kurstillfällen/kursomgångar

HT19 för programstuderande

HT18 för programstuderande

Lärandemål

After the course, the participant shall be able to:

  • Apply perturbation methods to new situations:
    - Predict the response of a novel, non-linear system – approximated by a conservative, finite degree-of-system – using a perturbation method.
    - Predict the response of a novel, non-linear system – approximated by a non-conservative, finite degree-of-system – using a perturbation method.
    - Calculate all the resonance frequencies of a forced, novel, non-linear system – approximated by a non-conservative, single degree-of-system – using a perturbation method.
    - Demonstrate a correct use of a perturbation method in the prediction of the standing wave response of a novel, non-linear continuous system – such as string, beam, plate or shell.
    - Predict the travelling wave response of a novel, non-linear continuous system using a perturbation method.
  • Analyze non-linear acoustic phenomena:
    - Identify the non-linear phenomena for finite degree-of-freedom systems.
    - Point out the reasons for the non-linear phenomena for finite degree-of-freedom systems.
    - Identify the non-linear phenomena for continuous systems.
    - Point out the reasons for the non-linear phenomena for continuous systems.
  • Judge the value of applied perturbation methods for a given application:
    - Write a short exposition evaluating the relative merits of the applied perturbation methods.
    - Compare the response results predicted by a perturbation method with those of a basic numerical method.
    - Explain the reasons for a good match between results obtained by a perturbation method and those of a basic numerical method.
    - Explain the reasons for any mismatch between results obtained by a perturbation method and those of a basic numerical method.

Also after the course, for higher grades (A-C), the participant shall be able to:

  • Display a scientific attitude towards non-linear problems:
    - Demonstrate curiosity in identifying non-linear problems.
    - Seek natural causes of non-linear phenomena.
    - Demonstrate open-mindedness when seeking solutions.
    - Suspend judgments until all evidence is available.
    - Show objectivity in analyzing evidence and drawing conclusions.
    - Show willingness to revise conclusions as new evidence becomes available.

Kursens huvudsakliga innehåll

Conservative and non-conservative systems, forced oscillations of systems, continuous systems and travelling waves. Perturbation methods – such as straightforward expansion, Lindstedt-Poincaré method, method of multiple scales, method of harmonic balance, method of averaging – and basic numerical methods.

Behörighet

Basic courses in mathematics, mechanics.

Litteratur

Compendium Non-linear Acoustics, Leif Kari

Examination

  • TEN1 - Tentamen, 6,0, betygsskala: A, B, C, D, E, FX, F

Krav för slutbetyg

Written home assignments (TEN1; 6 university credits).

Ges av

SCI/Farkost och flyg

Examinator

Leif Kari <leifkari@kth.se>

Påbyggnad

SD2145 Vibro-Acoustics
SD2130 Signal Analysis
SD2165 Acoustical Measurements
SD2150 Experimental Structure Dynamics
SD2155 Flow Acoustics
SD2160 Ljud- och Vibrationsprojekt
SD2170 Energy Methods
SD2175 Numerical Methods for Acoustics and Vibration
SD2185 Ultrasonics
SD2190 Vehicle Acoustics and Vibration

Versionsinformation

Kursplan gäller från och med HT2013.
Examinationsinformation gäller från och med HT2007.