Researcher on the application of non-linear dynamic absorbers to vibroacoustic control in heavy[...]

CNRS; France; Sur place; EUR 40 000 - 60 000; Plein temps

Résumé du poste

A French research organization is seeking a Researcher to design and develop a nonlinear absorber for underwater structures focusing on vibroacoustics. The role involves developing models, performing experimental validations, and collaborating with multiple research institutions. Candidates should have strong analytical skills, experience in nonlinear dynamics, and proficiency in Matlab and Mathematica. The position is full-time with a temporary contract and starts on February 1, 2026.

Qualifications

• Recognised Researcher (R2) level.
• Proficiency in conducting vibroacoustic experiments.
• Experience in nonlinear dynamics and experimental methodologies.

Responsabilités

• Design and develop a nonlinear absorber for underwater structures.
• Develop vibroacoustic models and validate concepts experimentally.
• Collaborate with researchers and partners on vibroacoustic control.

Connaissances

Analytical and numerical calculation skills

Proficiency in Matlab

Proficiency in Mathematica

Proficiency in nonlinear dynamics methods

Proficiency in experimental techniques

Formation

PhD in relevant engineering or physics field

Description du poste

Organisation/Company CNRS Department Laboratoire de Mécanique et d'Acoustique Research Field Engineering » Materials engineering Physics » Acoustics Researcher Profile Recognised Researcher (R2) Country France Application Deadline 31 Dec 2025 - 23:59 (UTC) Type of Contract Temporary Job Status Full-time Hours Per Week 35 Offer Starting Date 1 Feb 2026 Is the job funded through the EU Research Framework Programme? Not funded by a EU programme Is the Job related to staff position within a Research Infrastructure? No

Offer Description

The candidate will be required to design and develop a nonlinear absorber to control very low-frequency vibrations in an underwater structure. The project will have a scientific focus on studies in vibroacoustics and nonlinear dynamics from fundamental and experimental perspectives.

• Develop vibroacoustic models of academic underwater structures, such as plates and cylinders;
• Design a nonlinear absorber adapted to the structures under study. Several types of absorber can be explored, with non-linearity provided by different technological solutions;
• Validate the concepts experimentally through measurements in an acoustic tank on plate and cylinder models.

• Development of analytical and numerical methods to describe the coupling of vibroacoustics in heavy fluids and thin structures (such as plates and shells); taking into account nonlinear phenomena for dissipating very low-frequency vibroacoustic fields;
• Development of nonlinear absorbers optimised for the vibroacoustic control of damped structures, and implementation on an experimental device;
• Conducting vibroacoustic experiments in air and assisting with experiments in heavy fluid (water).

The work will be carried out in partnership with the Sons team at the Laboratory of Mechanics and Acoustics (LMA) in Marseille, the Institute of Electronics, Microelectronics and Nanotechnology (IEMN) in Lille, and the Acoustics Department at Naval Group's (NG) research centre in Ollioules. The successful candidate will be based primarily at the LMA, where they will carry out theoretical and numerical work, develop a prototype of a nonlinear absorber, and conduct airborne experiments. Close collaboration with Naval Group will be required to define noise reduction objectives in terms of both acoustic pollution in the marine environment and the acoustic discretion of surface vessels and submarines. They will also collaborate with the IEMN to design the prototype and the experimental protocol to be tested in heavy fluid.

• Analytical and numerical calculation skills (vibration theory, fluid-structure coupling, complex modal analysis, perturbation methods, numerical code development).
• Proficiency in Matlab and Mathematica.
• Proficiency in nonlinear dynamics methods and tools (harmonic balancing, multiple scale developments, invariant manifolds, singularity method, bifurcation theory).
• Proficiency in experimental techniques: design of experiments and experimental plans, development of a methodology adapted to metrological constraints (measurements in air and water), data acquisition and processing.