Andrei Karzhou

Andrei Karzhou disputerer for ph.d.-graden i ingeniørvitenskap og vil offentlig forsvare avhandlingen / Andrei Karzhou will defend his thesis for the PhD degree in Engineering Science:

“Acoustical properties of solid-liquid composites and related computational problems”.

Avhandlingen er tilgjengelig her / The doctoral thesis is available here.

Auditoriet er åpent for publikum. Disputasen vil også bli strømmet. Opptak av disputasen vil være tilgjengelig i en måned.
The auditorium is open to the public. The defense will be streamed. A recording of the defense will be available for one month.

Prøveforelesningen starter kl. 10:15 / The trial lecture starts at 10:15. Tittel / title:

“Mathematical methods for practical acoustic problems”.

Disputasen starter kl. 12:15 / The defense starts at 12:15.

Prøveforelesning strømmes her, og disputas strømmes her. / The trial lecture will be streamed here, and defense will be streamed here.

Sammendrag av avhandlingen / Summary of the thesis:

This thesis studies acoustical properties of solid-liquid composites, i.e. materials with liquid components incorporated into a solid matrix, and related computational problems. We investigate the sound attenuation in perforated plates filled with polyurethane and oil grease lubricant, as well as plates with isolated inclusions.

When emitted sound meets an elastic obstacle, an interaction on the interface between the fluid and the solid occur. This interaction problem can be handled by a partitioning method, i.e. the equations in the fluid and solid domains are solved alternately.

The frequency response is a measure of the output as a function of input frequency. Machine learning methods can help to predict the frequency response for the average characteristics of a system with complex geometry.

In nonhomogenious media sound waves of different frequencies travel with different speed. We can recover the material properties given the observed sound pressure by solving the inverse problem.

Veiledere / Supervisors

Hovedveileder / Main supervisor: Associate Professor Klas Pettersson, Ericsson AS, Sweden.

Medveiledere / Co-supervisors:

• Associate Professor Irina Pettersson, Chalmers University of Technology, Sweden
• Associate Professor Rune Dalmo, UiT The Arctic University of Norway.

Bedømmelseskomité / Evaluation committee:

• Professor Olivier Dazel, University of le Mans, France, 1st opponent
• Associate Professor Sara R. Martin, NTNU, Norway, 2nd opponent
• Associate Professor Aleksander Pedersen, UiT The Arctic University of Norway, leader of the committee

Prøveforelesning og disputas ledes av prodekan for forskning, Svein-Erik Sveen /

The trial lecture and defense are led by Vice Dean of research, Svein-Erik Sveen.

De som ønsker å opponere ex auditorio kan sende e-post til Svein-Erik Sveen / Opponents ex auditorio should contact Svein-Erik Sveen.