Vadgaonkar, P. and banik, D., "Electromagnetic Compatibility and Interference - Design Methodology, Challenges and Guidelines for Avionics Product and Systems," SAE Technical Paper 2017-01-2118, 2017.
Avionics industry is moving towards more electric & lightweight aircrafts. Electromagnetic effects becomes significantly challenging as materials starts moving towards composite type. Traditional methods for controlling EMC will not be sufficient. This shift increases the complexity of in-flight hardware elements for EMI/EMC control.This paper discusses the need for EMI/EMC Control and brings out the analysis & applicability of various EMI/EMC standards in aerospace, commercial and industrial electronic products, provides comparative study with respect to levels. The study include various sections of DO-160 and applicable guidelines for controlling EMI/EMC with respect to LRU (Line Replaceable Unit) & wire/cable harnesses. Also presents guidelines with respect to shielding of components, selection of components, grounding schemes, filter topologies and layout considerations.It provides comparative study made for different filters, good layout examples, generic simulation examples and lessons learnt from the failures. An attempt is made to propose the design methodology to be adapted for successful design for Electromagnetic effects.This paper puts forth the various challenges like size constraints, isolation requirements, component shielding, cost of EMI filters, weight, layout of- high speed & mixed signal boards and interference due to new wireless devices getting added on aircraft. The paper makes an effort to provide the possible mitigation methods for the same.Implementation methods like H-Field dominance, smaller loop area, EMI gaskets, shielding of cables and magnetic field control have been discussed. Various pain points with respect to qualification and reusability approach have been discussed. Probable solutions to overcome those have been outlined in this paper.