Identification of complex moduli for rubber compounds by minimisation of the error between measured and FE-modelled velocity profiles

• For all research that involves understanding of the contact between tyre and road surface, knowledgeof the tyres dynamical material properties is of importance. A method for identification ofthe complex moduli, i.e. dynamic stiffness and damping, of rubber tread materials is presented.The method is based on a velocity profile match between FE-models and measurements. Themeasurements are conducted on beam-like samples with a laser Doppler vibrometer, giving onlyinsignificant errors due to measurement interference. The specified material parameters are updatedin the FE-model in order to minimise the sum of the squared errors between measured andmodelled velocity data. This optimisation problem is solved with a gradient descent algorithm,where a one-dimensional wave model provides initial values. This identification method maybe used at higher frequencies for highly damped materials, and do not show the limitations ofmethods only evaluating the material at resonance frequencies. The method gives a consistentidentification in a wide frequency range.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Annan materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Other Materials Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

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