Vibracoustic claims AVS mounts with wide isolation range

ERJ staff report (DS)

Weinheim, Germany -- Vibracoustic said it has developed a new range of rubber-metal mounts which it says offer a particularly wide range of vibration isolation frequencies. The company said its quiettype products provide not only savings potential for customers, but is also paving the way to vibration control solutions for alternative drives.

Vibracoustic said it has developed a way to modify the ratio of dynamic stiffness to static stiffness. Traditionally, passive rubber-metal units offer a relatively soft modulus under static load, but a higher modulus under dynamic load.

Dr. Hendrik Sell, Acoustics and Vehicle Testing Manager at Vibracoustic, explains: “Reduced dynamic stiffness prevents the rubber spring of the component from hardening. The rubber material will therefore retain its insulating softness, thus leading to a dramatic reduction in dynamic stiffness over a wide frequency range of even several hundred Hertz. Structure-borne sounds are isolated in the best possible way, while preventing the emission of any interfering sounds inside the vehicle.”

This discovery is being translated into practice by Vibracoutic in a targeted way with immediate effect on rear-axle gear mounts, among others, to isolate any gear whining sounds from arising on the rear axle.

Vibracoustic said the improved performance of the mounts will permit the mechanical elements to generate more noise, with no loss in performance or comfort within the cabin or for external noise. This can lead to significant cost savings for the total system cost, said Vibracoustic

Sell insists: „We are just beginning now to apply our findings to the various vibration control sectors involved. The potential for enhancement of structure-borne sound isolation remains very high on purely passive rubber-metal mounts.”

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Press release from Vibracoustic