The second-generation Rolls-Royce Ghost is well on its way but there are still a few elements that the British marque needs to polish before releasing it to its customers. One important aspect of the ownership experience is cabin sound. Rolls-Royce has revealed how it has approached NVH for the upcoming luxury coupe with “Formula for Serenity” project.
After receiving much feedback from current Ghost owners, Rolls-Royce understood that a near-silent cabin is of high importance due to owners using this environment as a place of business or relaxation.
Rolls-Royce’s acoustic specialists began work on the aluminium spaceframe architecture with a double-skinned bulkhead section which insulates the cabin from the 6,75-litre V12's engine note. Cavities in the roof, boot and floor are added to accommodate more than 100 kg of sound-absorbing materials. Additional revisions include double-glazed windows with a clear composite centre sheet and acoustic insulation foam-lined tyres.
For testing purposes, every component has been stringently tested for its acoustic properties. Parts that resulted in unacceptable levels of noise were thrown out and sent back to the drawing board for the design team at Goodwood to redraft. This includes smoothening of the air conditioning ducts to better insulate inhabitants from intrusive noises.
Upon further testing, the acoustic team discovered that the cabin was too silent and subsequently disorientating. To counteract this, a “whisper” resonant frequency is pumped into the cabin via acoustically tuned damping units for the seat frames, ports between the cabin and boot.
New Ghost Acoustic Engineering Lead, Tom Davis-Reason, says, “The extraordinary acoustic quality of new Ghost is the result of significant engineering developments and fastidious attention to detail, but it really is underpinned by the marque’s proprietary aluminium architecture. There is simply no way we could have created such an acoustically refined environment using a steel platform.”
The Ghost is scheduled for its global reveal this spring but, for special clients, Rolls-Royce will be sharing elements to demonstrate select engineering marvels.
Original article from Car