Haven of calm: optimum vibration and acoustic comfort

The new M-Class promises relaxed and therefore safe motoring under all possible (and even impossible) conditions. By paying close attention to detail every step of the way, the development engineers in the Mercedes Technology Centre have significantly improved what they call the NVH comfort level (Noise, Vibration, Harshness). This is a decisive parameter for the general sense of wellbeing on board, whilst also contributing to driver-fitness safety, especially on long journeys.

The basis for the high level of NVH comfort is provided by the very rigid SUV bodyshell of the Mercedes-Benz M-Class. The development engineers were faced with some particular challenges here. For example, they had to make allowance for the optional panoramic glass sunroof's large aperture in the construction. The objectives set for drive comfort were no less ambitious. Substantial improvements have been achieved in this regard compared to its predecessor, thanks to features such as map-controlled, hydraulic engine bearings, a resized aluminium transmission cross member with integral vibration damper, as well as the overhauled 7G-TRONIC PLUS with twin-turbine damper and centrifugal pendulum. Potential noise penetration from the engine compartment through to the interior is minimised by a major assembly partition wall made from plastic and the intelligent use of soundproofing to suit requirements. Aero-acoustic enhancements include the vehicle glazing with its high-insulation acoustic windscreen, additional sealing in the side sections, plus the streamlined add-on parts such as the restyled exterior mirror housings.

The measures at a glance:

Improved rigidity of the front end structure thanks to struts between the upper and lower levels of side members
Hybrid construction of front module increases comfort at the same time as reducing weight
Cockpit cross member made from particularly rigid magnesium alloy
Intelligent use of soundproofing to suit requirements: In the production facilities, insulation is applied to the bodyshell very precisely by computer-controlled robots. Insulation with varying mass distribution in parts is used in the firewall area in accordance with the potential noise penetration.
Aluminium transmission cross member with integrated vibration damper on the diesel models
Vibration-optimised 7G-TRONIC PLUS with twin-turbine damper, plus, on the diesel models, centrifugal pendulum
Map-controlled engine bearings on the diesel models
Decoupled exhaust system on the diesel models
Standard chassis with selective damping, as an option: AIRMATIC air suspension with Adaptive Damping System or AIRMATIC air suspension with Adaptive Damping System and ACTIVE CURVE SYSTEM dynamic roll stabilisation
Electric steering
Major assembly partition wall made from plastic in order to minimise penetration of noise from engine compartment into the interior
External noise minimised by acoustic encapsulation of engines
High-insulation acoustic windscreen
Additional aero-acoustic sealing in the side sections

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