| 摘要 |
2049023 9110584 PCTABS00006 To identify an object (2) which emits structure-borne noise onto a base, for example a railway vehicle approaching a track construction site, the vibrations (S) generated by the structure-borne noise are detected by a structure-borne noise recorder (2) attached to a rail (1) and are processed by an evaluation circuit (C). A warning signal (Sw) is emitted when the intensity of the output signal (Sa) from the recorder constantly increases, for example when the intensity exceeds given threshold values in a suitable frequency range in predetermined times; in other words, constantly swelling noise propagated in the rails (1) is evaluated as a reliable criterion for emitting a warning signal that indicates an approaching train.
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