PhD scholarship in Vibroacoustic Characterization and Modeling of Balanced Armature Receivers in Hearing Aids

fredag 13 nov 20

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Frist 3. januar 2021
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The Departments of Electrical Engineering and Mechanical Engineering, and the Centre for Acoustic-Mechanical Microsystems (CAMM) invite highly motivated and talented graduates to apply for a 3-year PhD position where you will conduct in-depth research on hearing aid (HA) receivers. CAMM combines expertise in electroacoustics, numerical methods, acoustic-mechanical coupling, optimization, materials and fabrication, and measurement techniques. We work in close collaboration with three Danish producers of hearing aids, which are highly technological companies with a large footprint in the world market of HAs.

A balanced armature receiver is a miniature, high-fidelity, high-efficiency loudspeaker based on electrodynamic excitation of a thin armature balanced between multiple magnets to drive a membrane. Receivers are key components in hearing aids subject to very demanding constraints in terms of efficiency, vibration, distortion, feedback, and size. In this project, you will thoroughly study this device using advanced analytical and numerical models and measurements and you will produce reliable descriptions of its performance based on its different physical aspects: acoustic, mechanical, electrical, and magnetic. You will use and develop the knowledge and tools available at CAMM in order to investigate improvements, redesigns, and alternatives.

Responsibilities and tasks
You will examine in detail all aspects of HA receivers: dynamic mechanical and acoustical behavior, magnetic circuits and materials, and electrical circuitry. Moreover, as the transducer is embedded in a tightly packed hearing aid, often in the form of dual receivers, you will examine transmitted vibrations and electromagnetic radiation. Your insight will lead to a better definition of the physical behavior and better performance of balanced armature receivers in HA devices. As a further step, you may also explore more radical, novel transduction concepts for HA receivers. 

Your research will include:

  • Electroacoustic characterization of a (dual) balanced armature transducer, including time and frequency responses, efficiency, feedback, and distortion.
  • Mechanical-acoustic characterization of transducer performance in hearing aids.
  • Advanced numerical simulation coupling electromagnetic, mechanical and acoustic domains.
  • Preparation of representative analytical models, such as lumped electro-mechanical-acoustical models, with a basis on the detailed physical behavior.
  • Practical measurements of the performance of receivers, as a validation for the models and additional insight.
  • Investigation of alternative transduction principles and designs that can be used in HA receivers. This may include the use of numerical optimization tools available at CAMM.

Knowledge in acoustics, electroacoustics, mechanical vibrations, electromagnetics, non-linear systems, scientific programming, numerical modeling and optimization, and experimental experience will be valuable for your application. You will work in a highly collaborative environment inside CAMM, as well as with local and international partners. Fluent written and spoken English is essential.

Your PhD project will result in scientific publications in international journals and presentations at international conferences. You will also assist teaching activities in our group.

As a PhD student in CAMM, you will:

  • Be a part of a creative and stimulating scientific environment.
  • Develop your theoretical and experimental skills.
  • Collaborate with academic and industrial experts in topics related to your project.

We offer an interesting and challenging job in an international atmosphere focused on research, teaching, innovation, and scientific advice for the benefit of society. We offer a position with great flexibility, and we emphasize work-life balance. DTU is among the leading European research and education institutions in the area of technical and natural sciences.

Candidates should have a two-year master's degree (120 ECTS points) or a similar degree with an academic level equivalent to a two-year master's degree in engineering, physics, acoustics, or related fields. Only candidates with documented experience in at least one and preferably multiple of the following areas will be considered: acoustics, electroacoustics, numerical methods, acoustic measurements and/or electromechanical transducers. Moreover, programming skills in languages such as Matlab or C++ and advanced use of numerical software packages such as COMSOL or ANSYS are needed for the project.

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


The assessment of the applicants will be made by Assoc. Prof. Vicente Cutanda Henríquez, Prof. Frieder Lucklum, and Assoc. Prof. Finn T. 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 upon with the relevant union. The period of employment is 3 years.

You can read more about career paths at DTU here

Further information
Further information may be obtained from Vicente Cutanda Henríquez ( tel.: +45 4525 3938 or Prof. Frieder Lucklum ( tel.: +45 4525 3937. You are very welcome to write or call if you have any questions about the position or the recruitment process. 

You can read more about the Centre for Acoustic Mechanical Microsystems at


Please submit your online application no later than 3 January 2021 (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 out 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)
  • Optional documents - English proficiency certificate (for instance TOEFL or IELTS), list of publications, and any other documents that demonstrate your experience in the areas related to the proposed PhD project

Candidates may apply prior to obtaining their master's degree but cannot begin before having received it.

Applications and enclosures received after the deadline will not be considered.

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

DTU Electrical Engineering educates students within electrical engineering technologies. We offer studies at BEng, BSc, MSc and PhD levels, and participate in joint international programmes. We conduct state-of-the-art research within antenna and microwave technology, robot technology, power and physical electronics, acoustic environment, electroacoustics, electric power and energy. Our department has more than 200 members of staff.

Technology for people
DTU develops technology for people. With our international elite research and study programmes, we are helping to create a better world and to solve the global challenges formulated in the UN’s 17 Sustainable Development Goals. Hans Christian Ørsted founded DTU in 1829 with a clear vision to develop and create value using science and engineering to benefit society. That vision lives on today. DTU has 12,000 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. Our main campus is in Kgs. Lyngby north of Copenhagen and we have campuses in Roskilde and Ballerup and in Sisimiut in Greenland.