{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "A method for detecting the velocity (v) of a railroad car (1) and a vertical acceleration (a) that occurs at the portion of a car body (2) above a spring device (6) of a bogie (3) while the car (1) is running on a track, and also extracting a component of the vertical acceleration (a) in a…",
  "path": "/patents/1112631",
  "publishedAt": "2001-06-06T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60T17/228",
    "TOKYU CAR CORP [JP]"
  ],
  "textContent": "A method for detecting the velocity (v) of a railroad car (1) and a vertical acceleration (a) that occurs at the portion of a car body (2) above a spring device (6) of a bogie (3) while the car (1) is running on a track, and also extracting a component of the vertical acceleration (a) in a predetermined frequency range. The method decides that the car (1) has derailed when the absolute value of the vertical acceleration (a) in this frequency range exceeds a predetermined limit vertical acceleration (al) corresponding to a predetermined velocity (v), or when a vertical displacement (d) calculated by double-integrating the vertical acceleration (a) for each predetermined evaluation time (T) is negative and its absolute value is greater than a reference value (dc).",
  "title": "METHOD AND APPARATUS FOR DETECTING RAILROAD CAR DERAILMENT"
}