DEFLECTION MEASUREMENT METHOD AND DEFLECTION MEASUREMENT DEVICE

PROBLEM TO BE SOLVED: To enhance accuracy in deflection measurement, by removing vibration velocity of a loading vehicle from a measured deflection velocity.SOLUTION: A deflection measurement method is for dynamic measurement of deflection on a paved road surface, and includes the following steps for: driving a loading vehicle 1 having a sensor cradle connected rigidly on a vehicle body and a laser Doppler vibrometer 3 and a vibration accelerometer 5 installed on the sensor cradle; obtaining a measurement on deflection velocity at each measurement point with the laser Doppler vibrometer 3 and a measurement on vibration acceleration at each measurement point with the vibration accelerometer 5, while driving the loading vehicle 1; performing discrete wavelet transform on a vehicle vibration waveform indicating the vibration acceleration at each measurement point, for determining a filter that almost flattens the vehicle vibration waveform; and removing the vehicle vibration velocity from the deflection velocity at each measurement point, by using the filter.SELECTED DRAWING: Figure 7 【課題】測定したたわみ速度から載荷用車両の車両振動速度を除去することによって、たわみ計測の精度向上を図る。【解決手段】舗装路面のたわみを動的に計測するたわみ計測方法であって、車体にセンサ架台が剛結され、センサ架台にレーザドップラー振動計３および振動加速度計５が設置された載荷用車両１を走行させるステップと、載荷用車両１の走行中にレーザドップラー振動計３で各測定点のたわみ速度を取得すると共に、振動加速度計５で各測定点の振動加速度を取得するステップと、各測定点の振動加速度を示す車両振動波形に対し、離散ウェーブレット変換を行なって、車両振動波形を概略平坦とするフィルタを決定するステップと、フィルタを用いて、各測定点のたわみ速度から車両振動速度を除去するステップと、を含む。【選択図】図７