PhD scholarship in Highly Absorbing Metamaterials for Broadband Applications

DTU Electrical Eng
Thursday 05 Jul 18

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The Acoustic Technology group at the Department of Electrical Engineering seeks qualified and talented candidates for a vacant PhD position in highly absorbing metamaterials for broadband applications.  

The Acoustic Technology group and the Centre for Acoustic-Mechanical Micro Systems conduct research in architectural acoustics, vibration, transducers, sound field analysis, measurement techniques, acoustical-mechanical interaction, numerical methods and optimization. As a part of a new research project we will initiate projects on acoustic metamaterials and their application in acoustic components and systems, looking into several different applications such as loudspeaker and building elements.

Acoustic metamaterials have emerged as an academic discipline within the last decade. The definition may be broadly interpreted as materials that display extraordinary properties not found in natural materials with respect to sound and vibration characteristics. They owe their properties to periodic internal structures in the sub-wavelength scale.

Recently it has been demonstrated that exotic properties of acoustic metamaterials may be compromised if the acoustic losses from viscous and thermal boundary layers are included in the model. These losses have been shown to play an important role even if the dimensions of the geometrical details become larger. In the present PhD project, we aim to exploit this newly discovered effect to create materials that are highly absorbing.

Responsibilities and tasks
This project will investigate the possibilities of using metamaterials for increasing the sound absorption. The goal of the project will be to extend the bandwidth, absorption and feasibility of absorbing metamaterials and make them usable in practical applications. It is envisioned that during the project the following elements will need to be addressed: 

  • Sensitivity analysis and optimization of a Boundary Element (BE) model with losses. The existing modelling tool, based on an in-house BE code with viscous and thermal losses included, has been shown to accurately model the loss effects in metamaterials. The simulation tool will be extended by using advanced shape optimization techniques. 
  • Broadband absorbers. In order to create materials that have practical applications as absorbers they should work for a broad range of frequencies. The second part of the PhD project will extend the analysis/optimization model to include theses effects. A time-domain model will be considered as a possibility for including frequency range optimization which calls for a new formulation of the existing BE model with losses. 
  • Application extensions. Application of the developed material in ducts and room absorbers requires extension of the model in different ways. For duct absorbers the inclusion of fluid flow will be essential and included in the model. For room absorbers an extension to cover a broad range of angles of incidence will be incorporated in the model.

We are looking for a highly motivated candidate with a relevant MSc in physics, acoustics, mechanical or civil engineering, and who can document experience in at least one, but preferable more, of the following areas: 

  • Numerical modelling of acoustic systems
  • Optimization techniques
  • Room and duct acoustics
  • Viscous and thermal losses in acoustics

As a PhD student you will: 

  • Be a part of a creative and stimulating scientific environment
  • Participate in and contribute to scientific conferences
  • Develop your theoretical and experimental skills
  • Interact with experts in topics related to your project

Qualifications
Candidates should hold a MSc in engineering or a similar degree with an academic level equivalent to the MSc in engineering.

Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval, and the candidate will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the PhD study programme, please see the DTU PhD Guide.

Assessment
The assessment of the applicants will be made by Associate Professor Vicente Cutanda Henríquez, Associate Professor Cheol-Ho Jeong and Associate Professor Finn Agerkvist.

We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility.

Salary and appointment terms
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed with the relevant union. The period of employment is 3 years.

As the PhD project is a part of a major research collaboration with the Korean Advanced Institute of Science and Technology (KAIST), South Korea, the PhD project will include an external research stay at KAIST.

You can read more about career paths at DTU here.   

Further information
Further information may be obtained from Vicente Cutanda Henríquez, vcuhe@elektro.dtu.dk, tel.: +45 4525 3938 or Cheol-Ho Jeong, chj@elektro.dtu.dk, tel.: +45 4525 3934

You can read more about the Acoustic Technology Group and the Centre for Acoustic Mechanical Micro Systems on www.act.elektro.dtu.dk and www.camm.elektro.dtu.dk.   

Application
Please submit your online application no later than 17 August 2018 (local time).Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link "Apply online", fill in the online application form, and attach all your materials in English in one PDF file. The file must include: 

  • A letter motivating the application (cover letter)
  • Curriculum vitae
  • Grade transcripts and BSc/MSc diploma
  • Excel sheet with translation of grades to the Danish grading system (see guidelines and excel spreadsheet here)

Candidates may apply prior to ob­tai­ning their MSc, but cannot begin before having received it.

All qualified candidates irrespective of age, gender, race, disability, religion or ethnic background are encouraged to apply.

DTU Electrical Engineering is the central department within electrical and biomedical engineering. It is our goal to ensure research and engineering training at the highest international level. The department is organized into 8 groups each covering important areas of electrical and biomedical engineering. Including PhD students we have more than 275 staff members. You can read more about us at www.elektro.dtu.dk.

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 6,000 advance science and technology to create innovative solutions that meet the demands of society, and our 11,200 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government and public agencies.