Damping Plate Reduces Engine Noise At PSA
Trelleborg Automotive has developed a damping plate that allows PSA Peugeot Citroen to reduce noise and vibration caused by diesel-engine knocking. Trelleborg Automotive used its NVH experience to produce a specially-cut shear plate, engineered using the company's Duru-LAM material. Resistant to both heat and oil, Duru-LAM is a proven material for damping sound and vibrations in internal engine applications and, in the shear plate design, it comprises a layer of rubber sandwiched between two layers of steel. The shear plate is then positioned according to the packaging requirements of different core engine designs and can be used in gasoline, as well as diesel variants. Arvid Norberg, research and development NVH manager at Trelleborg Automotive, said: 'The conventional solution to reduce vibration is to increase engine block stiffness, but in many cases this only shifts the noise to higher frequencies. 'The introduction of the shear plate enables us to reduce vibratio...