Computational Electromagnetics

Maximising design confidence early in the development programme.

The main benefit of numerical modelling is to provide early access to objective information to guide critical design decisions and hence avoid costly rework in the later stages of development. In addition, simulation may be the only practicable way of investigating some issues that cannot currently be measured (e.g. induced effects on the human body such as SAR, induced internal fields and current density etc.).

HORIBA MIRA is active in a number of computational electromagnetics (CEM) application areas, including:

  • Simulation of EMC aspects for vehicles and major subsystems (e.g. traction batteries)
  • Antenna design and installed performance prediction for vehicle-mounted antennas
  • Simulation of electromagnetic field exposure to low frequency magnetic fields and radiofrequency electromagnetic fields
  • Simulation-based analysis of EMC test methods
  • Design of EMC chambers, test antennas and other experimental equipment

HORIBA MIRA’s CEM specialists also contribute to the development of IEEE Standard 1597.1 (“IEEE Standard for Validation of Computational Electromagnetics Computer Modeling and Simulations”).

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Electromagnetic Compatibility (EMC)

The availability of vehicle geometry and increasingly affordable computing power enable large scale electromagnetic simulation of complex structures such as vehicles.

Models of this nature can be used for a variety of purposes in support of vehicle EMC engineering, including:

  • Ranking by risk for module locations
  • Requirements for enhanced sub-system immunity requirements
  • Opportunities for relaxing sub-system immunity requirements
  • Coupling to cables
  • Identification of impact of vehicle structures on EMC performance

CEM can also be used for assessing the properties of complex sub-systems such as traction batteries for electric vehicles.

Vehicle antenna performance

Vehicle antenna behaviour is profoundly influenced by the geometry and electrical properties of the structure that they are mounted on.

The availability of numerical models for vehicle structures also facilitates prediction of the impact of different mounting locations, body shapes and materials.

Installed antenna performance parameters include:

  • Gain
  • Radiation patterns
  • Input impedance

In addition, potential interference between on-board antenna systems can also be assessed.

Electromagnetic Field Exposure (EMF)

Numerical models of vehicles can also be used to assess the potential human exposure to electromagnetic environments arising from vehicle related sources including:

  • Radio-frequency fields due to on-board wireless transmitters
  • Low frequency magnetic fields associated with electrical power train
  • Electromagnetic fields due to wireless power transfer systems

In addition, induced in-body parameters such as specific absorption rate can be simulated for sources that are operated very close to the human body, or for electromagnetic environments that exceed recommended field levels.