Abstract
The part b-factor analysis as a method to quantitatively evaluate the deformation form of parts in the natural vibration mode of a structure using the first-order sensitivity of thickness and Young's modulus to the eigenvalues obtained from modal analysis is proposed. This analysis is applied to the vehicle body to confirm that the bending deformability of each part, “part b-factors”, have values in the theoretically predicted range of 1 to 3 for several natural vibration modes of vehicle body. Then, parts that require structural improvements to improve eigenvalues while reducing the increase in the mass of vehicle body are selected based on sensitivities and part b-factors, and their effects are verified. In addition, by comparing the part b-factors in several natural vibration modes, the relationship between the deformation modes of the entire vehicle body and the deformation modes of individual parts is discussed.
