Natural frequency estimation method of structure and natural frequency estimation program of structure

摘要

PROBLEM TO BE SOLVED: To provide an eigen frequency estimation method of a structure capable of designing the structure having a proper strength and an eigen frequency estimation program of the structure.SOLUTION: A mass ratio of a mass per unit length of a beam (structure) and a mass per unit length of the vehicle are obtained, and a relationship between a travel speed of the vehicle and a deflection generated in the beam by the vehicle traveling with the travel speed is obtained for each mass ratio and a support span of the beam when considering the mass and the behavior of the vehicle during traveling and when not considering the same but assuming that a load equivalent to the mass of the vehicle moves on the beam with the travel speed, respectively, and Eigen frequency ratio between the Eigen frequency of the beam when considering the mass and the behavior of the vehicle traveling for each mass ratio and the support span of the beam and the Eigen frequency of the beam when assuming that the load equivalent to the mass of the vehicle moves on the beam with the travel without considering the same is obtained, and the relationship between the mass ratio, the support span of the beam, and the Eigen frequency ratio is obtained.SELECTED DRAWING: Figure 1