To easily detect a cavity under a road surface.SOLUTION: An information processor calculates a difference di between the passing times of front and rear wheels of a vehicle V based on a speed vi and a wheel base h of the vehicle V. The information processor acquires first sound data collected by a first microphone M1 installed near the front wheel of the vehicle V in a period [ti, ti+Δt] and second sound data collected by a second microphone M2 installed near the rear wheel in a period [ti+di, ti+di+Δt]. The information processor calculates a difference Si between the first sound data and the second sound data. When the difference Si is larger than a threshold Th, the information processor determines that there is a cavity under the road surface where the vehicle V has traveled. When a difference Si+2 among the differences Si-Si+3 at the respective times ti-ti+3 is larger than the threshold Th, for example, the information processor determines that there is a cavity under the road surface where the vehicle V has traveled at the time ti+2.SELECTED DRAWING: Figure 7
【課題】路面下の空洞を簡単に検出すること。【解決手段】情報処理装置は、車両Vの速度viとホイールベースhとに基づいて、車両Vの前後輪の通過時間差diを算出する。情報処理装置は、車両Vの前輪付近に設置された第1マイクロホンM1により期間[ti、ti+Δt]に集音された第1音データと、後輪付近に設置された第2マイクロホンM2により期間[ti+di、ti+di+Δt]に集音された第2音データとを取得する。情報処理装置は、第1音データと第2音データとの差分Siを算出し、差分Siが閾値Thよりも大きい場合、車両Vが走行した路面下に空洞があると判定する。例えば、各時刻ti〜ti+3における差分Si〜Si+3のうち、差分Si+2が閾値Thよりも大きい場合、情報処理装置は、時刻ti+2に車両Vが走行した路面下に空洞があると判定する。【選択図】図7
ROAD SURFACE STATE ESTIMATION PROGRAM, ROAD SURFACE STATE ESTIMATION METHOD, AND INFORMATION PROCESSOR
路面状態推定プログラム、路面状態推定方法および情報処理装置
2021-02-12
Patent
Electronic Resource
Japanese
IPC: | G01H MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES , Messen von mechanischen Schwingungen oder Ultraschall-, Schall- oder Infraschallwellen / G01M TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES , Prüfen der statischen oder dynamischen Massenverteilung rotierender Teile von Maschinen oder Konstruktionen / G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS |
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