IDENTIFICATION METHOD AND IDENTIFICATION SYSTEM FOR WAVE PROPAGATION CHARACTERISTICS OF LONG STRUCTURE

To appropriately identify the wave propagation characteristics of a long structure by using an on-site test.SOLUTION: An identification method for the wave propagation characteristics of a long structure includes exciting a plurality of excitation points of a rail (step S11) and measuring excitation forces at the excitation points (step S12), and measuring, at a measurement point of the rail, the acceleration of a wave propagating through the rail by the excitation of the excitation points (step S13). The method includes deriving the frequency response function of the acceleration at the measurement point based on the excitation forces and the acceleration (step S14). The method includes acquiring the spatial frequency distribution of imaginary number terms of the frequency response function (step S15). The method includes performing Fourier transform on the spatial frequency distribution for each frequency in a spatial direction to identify the relationship between the wavelength of the wave and the frequency of the wave (step S16).SELECTED DRAWING: Figure 6 【課題】現地での試験によって長尺構造物の波動伝搬特性を適切に同定する。【解決手段】レールの複数の加振点を加振し（ステップＳ１１）、当該加振点における加振力を計測する（ステップＳ１２）とともに、レールの計測点において、加振点の加振によりレールを伝搬する波動の加速度を計測する（ステップＳ１３）。加振力と加速度に基づいて、計測点における加速度の周波数応答関数を導出する（ステップＳ１４）。周波数応答関数の虚数項の空間周波数分布を取得する（ステップＳ１５）。空間周波数分布を各周波数に対して空間方向にフーリエ変換を行い、波動の波長と波動の周波数との関係を同定する（ステップＳ１６）。【選択図】図６