PhD position field of nonlinear vibrational metamaterials

Dübendorf

• Empa
• 100%
• Académique:
  Doctorant
• Zürich & Schaffhouse

Materials science and technology are our passion. With our cutting-edge research, Empa's around 1,100 employees make essential contributions to the well-being of society for a future worth living. Empa is a research institution of the ETH Domain.

The Laboratory for Acoustics/Noise Control is an international team of scientists and engineers active in the fields of vibroacoustics, environmental acoustics, and psychoacoustics. The diverse research topics rely on extensive numerical models and a broad range of experimental equipment for noise and vibration measurements.

Mechanical waves and vibrations are traditionally controlled using linear devices with fixed properties. In this PhD project, the student will explore a new generation of nonlinear resonators whose dynamic behaviour changes with vibration amplitude, enabling functionalities that are not achievable with conventional designs. The research will combine mechanical modelling, finite-element simulations, prototype development, and experimental testing. The goal is to develop efficient models and design rules for nonlinear metamaterials capable of adaptive vibration isolation, frequency conversion, and non-reciprocal wave propagation.

The successful candidate will work within a collaborative Swiss-French project involving Empa, ETH Zurich, and LAUM.

• Develop analytical and numerical models for strongly nonlinear resonators exhibiting nonlinear stiffness, damping, and inertia effects.
• Design, simulate, and optimize novel resonator concepts based on inertia amplification, bilinear stiffness, and multi-degree-of-freedom dynamics.
• Manufacture and experimentally characterize resonator prototypes using vibration testing, laser vibrometry, and modal analysis techniques.
• Investigate nonlinear phenomena such as internal resonances, frequency conversion, bifurcations, and nonlinear energy transfer.
• Create reduced-order models and efficient simulation tools for the design of nonlinear metamaterials and wave-control devices.
• Disseminate research results through publications in leading journals, presentations at international conferences, and collaboration with project partners at ETH Zurich and the Université du Mans.

• I have a master degree in engineering, physics or mathematics, obtained no longer than four years ago and performed above average in comparison to my peers.
• I am proficient in written and spoken English.
• During my courses or prior professional activities, I have gathered some experience with at least one of the following: structural and/or nonlinear dynamics, numerical modelling techniques (finite element method), or experimental methods in acoustics. I have a profound interest for these topics.
• As a researcher I perform research in a structured and scientifically sound manner. I read technical papers, understand the nuances between different theories and implement and improve methodologies myself.
• In frequent reporting, varying between weekly to monthly, I show the results that I have obtained and I give a well-founded interpretation of those results. I iterate on my work and my approach based on the feedback of my supervisors which steer the direction of my research.
• It’s important for me to work as an active team member and I am eager to share my results to inspire and being inspired by my colleagues.
• During my PhD I want to grow towards more independence, e.g. representing the research group on project meetings and conferences. I see these events as an occasion to disseminate my work to an audience of international experts and research colleagues, and to learn about…