What methods are used to isolate engine vibrations from the cabin?

Engine vibration isolation methods include: Rubber engine mounts (tuned for specific frequency ranges), hydraulic mounts (better damping at varying frequencies), active engine mounts (electronically controlled for optimal isolation), structural damping treatments (constrained layer damping), decoupled subframes, and powertrain balancing (balance shafts in 4-cylinder engines). Modern EVs face different challenges as motor vibrations are minimal, but high-frequency whine requires different solutions.