Case Study: Royal Enfield achieves pass-by noise compliance while preserving signature rumble with Hexagon simulation software

Royal Enfield has used simulationled design to develop a variety of motorbikes that meet European passby noise regulation standards while maintaining their characteristic rumble

Royal Enfield, a historic motorcycle manufacturer, faced the challenge of meeting stringent European pass-by noise regulations without compromising the iconic engine rumble that is a signature of its brand. To achieve this, they partnered with vendor Hexagon. The company needed a way to predict and analyze noise levels from the engine, exhaust, and intake system during the design phase, long before building physical prototypes.

Using Hexagon's MSC Software tools, including Adams, MSC Nastran, and Actran, Royal Enfield implemented a simulation-led design process. This solution allowed them to predict noise levels with 70-80% accuracy compared to physical tests. For Hexagon, this approach brought greater predictability to vehicle launch cycles, preventing potential 3-4 month delays and ensuring the company could maintain its aggressive product launch schedule while achieving regulatory compliance.

Royal Enfield

Rod Giles

Head CAD & CAE