車上測定データによる軌道の異常検出（第1報，レール波状摩耗の検出）

摘要

現在の鉄道の軌道等の保全は，保守員の巡回や，新幹線や一部の幹線では，専用の軌道検測車により軌 道の状態を定期的に検測することによって行われてい る．また，専用の軌道検測車や特別の試験車を用いる 場合，目的とする信号を直接計測することを意図し， 加速度計や歪みゲージなどのセンサを車輪近傍などの 環境が悪く，信号の伝送しにくい位置に配置する場合 が一般的であり，取り扱いや維持管理が煩雑で，常時 観測は困難な状況にある．%Conditions of track have conventionally been measured by using exclusive inspection vehicles. If the conditions of the track can be detected by attaching simple sensors such as accelerometers on board of commercial vehicles, more efficient maintenance of tracks would be possible. This paper describes rail corrugation detection from vertical acceleration of a vehicle body and the running noise by time-frequency analysis. An actual vehicle running tests on a commercial line was conducted, in which vertical acceleration of axle boxes and a vehicle body, and exterior noise were measured. In this paper we show first, the rail corrugation can be detected from the vertical acceleration of vehicle body by multi-resolution analysis (MRA) using wavelet transform. Second, it is shown that the incipient corrugation can be detected effectively from the exterior noise measured in actual vehicle, and finally, these methods can be applied to the detection of rail corrugation from interior noise measured in passenger room.