Marqueur

Specialists in Numerical Simulation and Test Engineering

Armoured vehicles, military aviation, and naval forces: our teams have supported the key players in defence in developing and optimising state-of-the-art equipment.

Armoured vehicles

The development of defence and security vehicles is linked to their operational activity. Their mobility platforms can be optimised for obstacle clearance, but must also ensure the stability of the weapons regardless of the terrain where the vehicle is operated. The protection of those on board is essential, and the integrity of the vehicle, in the event of mine explosion or ballistic impact, must be ensured by the shielding, a characteristic element of these vehicles.

Our teams work with major players in the construction of military vehicles for the development of platforms with our multibody simulation tools. Our expertise in fluid mechanics also leads us to optimise the air conditioning systems for the comfort of the troops. We also support them for armour optimisation via the numerical simulation of ballistic impacts and explosions of buried mines.

Naval

The development of digital twins for the design of a defence ship can significantly reduce design time. It also makes it possible to anticipate maintenance and to plan the modernisation of equipment. Acoustic discretion is one of the key topics in the development of a submarine or surface vessel; its purpose is to limit the noise and vibrations that can come from the propulsion or structure.

Our know-how in the management of large-scale modelling and in the automation of meshes finds all its importance in the naval field. Our teams are able to simulate wave behaviour and optimise propulsion systems while reducing vibration and acoustic noise.

Aeronautics

Drones, fighter planes or troop carriers, all these aircraft are subject to similar demands to those of civil aviation but to a greater degree. Our expertise allows us to carry out studies ranging from the simulation of the propagation of cracks in fuselage frames (XFEM), to the evaluation of the pressures and thermal stresses within the reactors through carrying out vibratory analyses, and analyses of fatigue, holding equipment and electromagnetic compatibility.

Our actions

Initial design

  • Research of innovative structural concepts
  • Multi-material parts (steel, aluminium, composites)
  • Welded, riveted, bolted or glued joints

Multibody dynamics

  • Vehicle dynamic behaviour specific to military operations
  • Subsystem analysis
  • Fatigue, vibrations

CFD, external and internal aerodynamics, heat exchange

  • Mine explosion
  • Fluid interaction structure
  • Ballistic pulse effect
  • Compressor study and turbine characterisation
  • Study of air intake and flow splitters (pressure drops)
  • Design and optimisation of blades and rotors (detachments, boundary layers)
  • Internal combustion engine
  • Thermal comfort
  • Thermics of electronic equipment

Structure and crash calculation

  • Fatigue resistance of the systems within the structure (random vibrations)
  • Crack propagation: fuselage and turbine blades (XFEM)
  • Other impacts

Acoustics / Electromagnetism

  • Acoustic discretion
  • Electromagnetic compatability (EMC)

Tests

  • Characterisation of shielding materials
  • Hopkinson tests (high speed of deformation)
  • Gleeble tests (high temperature)
  • Test follow-up
  • Correlation of test calculations

Respect of norms and standards

  • Environmental Engineering Considerations and Laboratory Tests
    MIL-STD-810
  • NATO STANAG, GAM, DEF STAN