EP0463127A1 - Arrangement for identifying an object by means of structure-borne noise, and use of said arrangement. - Google Patents

Arrangement for identifying an object by means of structure-borne noise, and use of said arrangement.

Info

Publication number
EP0463127A1
EP0463127A1 EP91900710A EP91900710A EP0463127A1 EP 0463127 A1 EP0463127 A1 EP 0463127A1 EP 91900710 A EP91900710 A EP 91900710A EP 91900710 A EP91900710 A EP 91900710A EP 0463127 A1 EP0463127 A1 EP 0463127A1
Authority
EP
European Patent Office
Prior art keywords
intensity
sound
output signal
signal
evaluation circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91900710A
Other languages
German (de)
French (fr)
Other versions
EP0463127B1 (en
Inventor
Bruno Mueller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0463127A1 publication Critical patent/EP0463127A1/en
Application granted granted Critical
Publication of EP0463127B1 publication Critical patent/EP0463127B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L29/00—Safety means for rail/road crossing traffic
    • B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
    • B61L29/28—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated
    • B61L29/32—Timing, e.g. advance warning of approaching train
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
    • B61L1/02—Electric devices associated with track, e.g. rail contacts
    • B61L1/06—Electric devices associated with track, e.g. rail contacts actuated by deformation of rail; actuated by vibration in rail
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L29/00—Safety means for rail/road crossing traffic
    • B61L29/08—Operation of gates; Combined operation of gates and signals
    • B61L29/18—Operation by approaching rail vehicle or rail vehicle train
    • B61L29/22—Operation by approaching rail vehicle or rail vehicle train electrically
    • B61L29/222—Operation by approaching rail vehicle or rail vehicle train electrically using conductor circuits with separate contacts or conductors
    • B61L29/224—Operation by approaching rail vehicle or rail vehicle train electrically using conductor circuits with separate contacts or conductors using rail contacts

Definitions

  • the invention relates to an arrangement for detecting an object with a structure-borne sound sensor for detecting the structure-borne sound generated by the object and transmitted to the sensor in a sound-conducting medium, and with an evaluation circuit which receives an output signal from the sensor and a warning signal emits when this output signal fulfills predetermined criteria, and a use of this arrangement, in particular for the detection of an approaching vehicle.
  • a structure-borne sound sensor for detecting the structure-borne sound generated by the object and transmitted to the sensor in a sound-conducting medium
  • an evaluation circuit which receives an output signal from the sensor and a warning signal emits when this output signal fulfills predetermined criteria
  • Such an arrangement is known for example from CH 643 078. It is used to identify a burglar when trying to break through a wall or safe door by detecting the structure-borne sound vibrations transmitted in the wall, wall or door as a sound-conducting medium to the structure-borne sound sensor and processing them by the evaluation circuit.
  • the signal evaluation in this arrangement takes place in such a way that the vibrations occurring during an attempted break-in are reliably distinguished from disturbing vibrations from the environment and faulty alarm signaling is avoided.
  • the aim here is to suppress signaling until it is ensured that the structure-borne noise received was really caused by an attempted break-in.
  • the object of the invention is to further develop the above-mentioned arrangements for the detection of an object by means of the structure-borne noise generated by the object in such a way that an object with steadily increasing or decreasing intensity of the structure-borne noise generated also signals reliably in any case and also in the presence of other interference vibrations becomes.
  • this object is achieved in that the evaluation circuit is set up to send a signal to a warning device if the output signal of the structure-borne sound sensor has a predetermined change in intensity in a predetermined time, e.g. if the intensity between two points in time exceeds a predetermined threshold.
  • the evaluation circuit checks the intensity periodically at regular time intervals using a comparator and triggers a warning signal if the intensity has exceeded a threshold value between at least two successive measurement times, and if the warning signal is maintained until the intensity between two later measurement times has fallen below a predetermined threshold.
  • a warning signal is triggered when the intensity of the structure-borne noise has successively passed the two threshold values in a specific frequency range at predetermined time intervals, which is an unmistakable sign for an object with a continuously increasing intensity of the structure-borne noise generated.
  • Such an arrangement can advantageously be used, for example, for the detection of an approaching vehicle.
  • a rail vehicle e.g. a train or a locomotive on a track
  • the structure-borne noise transducers are attached to the rails and register the structure-borne noise generated by the train and transmitted via the rails to the measuring location, the intensity of which increases steadily as a train approaches.
  • the special signal evaluation ensures that a warning signal is triggered with the greatest possible certainty, even if there are noises, but that a certain selectivity is nevertheless guaranteed, so that an accident with usually catastrophic consequences can be avoided with greater certainty than if one relies on frequently unreliable human observation, in particular under unfavorable weather conditions, such as fog, or in the event of fatigue or other misconduct on the part of the security personnel.
  • FIG. 1 shows an embodiment of an arrangement for signaling an approaching train at a remote track construction site with an associated evaluation circuit in a schematic representation
  • Fig. 2 is a functional diagram for signal evaluation for warning signaling
  • FIG. 3 shows a functional diagram of another signal evaluation circuit.
  • FIG. 1 shows an arrangement for ascertaining an object in the form of a train 2 approaching a track construction site B on a track 1.
  • the train 2 or the locomotive generates a characteristic structure-borne noise in the rails 1 ", which is transmitted via the rails as a sound-conducting medium with sound speed, ie with a few k / sec from the train 2 to the construction site B.
  • a structure-borne sound sensor 3 is fixed, that is, in good sound-conducting contact, it is expedient to provide a sound sensor with a piezoelectric acoustic / electrical transducer, or a structure-borne sound sensor of another known design Output signal from which is fed to a signal evaluation circuit C.
  • the evaluation circuit C has a frequency element 4 at its input, which has a frequency passband that is adapted to the frequency spectrum of a moving train and is preferably selected in the kHz range.
  • the output signal is then fed to a time discriminator 5, which is controlled by a clock generator 6.
  • the time discriminator generates two output signals for the intensity of the structure-borne noise recorded in the selected frequency range at two different times. These two signals, which are time-shifted relative to one another, are applied to the inputs of a comparator 7, which continuously compares the intensities of two successive signal intensities with one another and sends a signal to a warning device 8 as soon as the two intensities differ by a predetermined amount.
  • This can be the triggering or activation of a doublet signal for the construction team if the intensity when a train approaches a certain amount has risen, or to reset or switch off the warning signal when the intensity drops when a train moves away.
  • FIG. 1 shows an example of a functional diagram of the evaluation circuit C.
  • the curve shows the time course of the intensity I of the output signal of the sensor 3 in the selected frequency range.
  • the comparator 7 of the evaluation circuit compares the intensities at successive times t1, t2, t3 ... etc., and in particular determines whether a predetermined threshold value T has been exceeded at two times.
  • the threshold value T was exceeded briefly between the measuring times t1 and t2, for example as a result of a brief action such as a blow to the rail, but the intensity for both measuring times is below the threshold value, so that in this case no warning signal is triggered .
  • the intensity gradually increases and crosses the threshold value T between t2 and t3.
  • FIG. 3 shows an advantageous development of the invention using an analog functional diagram. Two staggered threshold values T1 and T2 are provided for the intensity I. As long as the intensity remains below the lower threshold Tl, there is no reaction.
  • a prewarning signal is triggered first, for example a warning device is activated and made ready for operation. If the intensity drops below the threshold T1 at time t4, the prewarning signal is reset until it is activated again, for example at time t5, because the threshold is exceeded again. If the intensity then increases further beyond the upper threshold value T2, for example at the measurement time t6, the main warning signal is triggered at this point in time and the approach of a train is thus signaled.
  • the evaluation device C can also be constructed differently within the scope of the inventive concept. In order to fulfill its function, it must be set up to signal a predetermined increase (or decrease) in the output signal of the structure-borne noise sensor in a predetermined period.
  • the evaluation can also advantageously be carried out using a microprocessor. Instead of digital, the evaluation can also be carried out analog.
  • the discriminator 5 can at exceeded, a lower threshold Tl activate a timer which zögerunszeit the discriminator made to check if the signal has exceeded at which time the upper threshold T2, or after a predetermined Ver ⁇ particular within a ' Time window .this. Threshold T2 exceeds.
  • the invention can also be used for the detection of other objects, provided that they cause structure-borne noise with a continuously increasing intensity at a remote measuring location, e.g. for signaling the approach of road vehicles, e.g. Tracked vehicles to a specific location by detecting ground vibrations and triggering appropriate measures

Abstract

PCT No. PCT/CH91/00001 Sec. 371 Date Sep. 9, 1991 Sec. 102(e) Date Sep. 9, 1991 PCT Filed Jan. 31, 1991 PCT Pub. No. WO91/10584 PCT Pub. Date Jul. 25, 1991.A method and apparatus for detecting an impact sound, such as a sound caused by a railroad vehicle approaching a construction location. The apparatus comprises an arrangement for detecting impact sound or vibrations with a receiver mounted at the rail, for example, and, further, an evaluation circuit for processing the vibrations and triggering a warning signal when the intensity of the receiver-output signal continuously increases, for example, when the intensity in a predetermined frequency range passes through predetermined threshold values during predetermined times. Thus, an approaching railroad vehicle can be positively detected by monitoring a continuously increasing sound or vibration which is propagated in the rails.

Description

Anordnung zur Feststellung eines Objektes mittels Körperschall, sowie deren VerwendungArrangement for the detection of an object using structure-borne noise, and its use
Technisches GebietTechnical field
Die Erfindung betrifft eine Anordnung zur Feststellung eines Objektes mit einem Körperschall-Aufnehmer zur Detektion des vom Objekt erzeugten und in einem schall¬ leitenden Medium zum Aufnehmer übertragenen Körper¬ schalles , und mit einer Auswerteschaltung, welche vom Aufnehmer ein Ausgangssignal empfängt und ein Warn¬ signal abgibt, wenn dieses Ausgangssignal vorgegebene Kriterien erfüllt, sowie eine Verwendung dieser Anordnung, insbesondere zur Feststellung eines heran¬ nahenden Fahrzeuges. Stand der TechnikThe invention relates to an arrangement for detecting an object with a structure-borne sound sensor for detecting the structure-borne sound generated by the object and transmitted to the sensor in a sound-conducting medium, and with an evaluation circuit which receives an output signal from the sensor and a warning signal emits when this output signal fulfills predetermined criteria, and a use of this arrangement, in particular for the detection of an approaching vehicle. State of the art
Eine solche Anordnung ist beispielsweise aus der CH 643 078 bekannt. Sie dient zur Feststellung eines Einbrechers beim Versuch, eine Wand oder Tresortür zu durchbrechen, indem die in der Mauer, Wand oder Tür als schalleitendem Medium zum Körperschall-Aufnehmer über¬ tragenen Körperschall-Schwingungen detektiert und von der Auswerteschaltung verarbeitet werden. Die Signal- Auswertung bei dieser Anordnung erfolgt so, dass die bei einem Einbruchversuch auftretenden Schwingungen sicher von Störschwingungen aus der Umgebung unter¬ schieden werden und eine fehlerhafte Alarmsignalgabe vermieden wird. Hierbei wird angestrebt, eine Signal¬ gabe so lange zu unterdrücken, bis sichergestellt ist, dass der empfangene Körperschall wirklich von einem Einbruchversuch verursacht wurde.Such an arrangement is known for example from CH 643 078. It is used to identify a burglar when trying to break through a wall or safe door by detecting the structure-borne sound vibrations transmitted in the wall, wall or door as a sound-conducting medium to the structure-borne sound sensor and processing them by the evaluation circuit. The signal evaluation in this arrangement takes place in such a way that the vibrations occurring during an attempted break-in are reliably distinguished from disturbing vibrations from the environment and faulty alarm signaling is avoided. The aim here is to suppress signaling until it is ensured that the structure-borne noise received was really caused by an attempted break-in.
Für andere Verwendungen, bei denen beispielsweise ein Objekt, das einen Körperschall mit stetig zunehmender oder abnehmender Intensität erzeugt, auf jeden Fall signalisiert werden muss, wobei eine durch allfällige Störschwingungen verursachte kurzzeitige fehlerhafte Signalgabe durchaus zugelassen werden kann, eignen sich die genannten vorbekannten Anordnungen nur bedingt. Für derartige Fälle bevorzugte man bisher eine rein menschliche Ueberwachung, die häufig unzuverlässig ist und häufig zu schweren Unfällen führte. Darstellung der ErfindungFor other uses in which, for example, an object that generates structure-borne noise with a steadily increasing or decreasing intensity must be signaled in any case, whereby short-term faulty signaling caused by possible interference vibrations can be permitted, the previously known arrangements are only suitable to a limited extent . For such cases, preference has so far been given to purely human monitoring, which is often unreliable and often leads to serious accidents. Presentation of the invention
Die Erfindung setzt sich die Aufgabe, die genannten Anordnungen zur Feststellung eines Objektes mittels des vom Objekt erzeugten Körperschalls derart weiterzu¬ bilden, dass auch ein Objekt mit stetig zunehmender oder abnehmender Intensität des erzeugten Körperschalls in jedem Fall und auch bei Vorliegen von anderweitigen StörSchwingungen sicher signalisiert wird.The object of the invention is to further develop the above-mentioned arrangements for the detection of an object by means of the structure-borne noise generated by the object in such a way that an object with steadily increasing or decreasing intensity of the structure-borne noise generated also signals reliably in any case and also in the presence of other interference vibrations becomes.
Erfindungsgemäss wird diese Aufgabe dadurch gelöst, dass die Auswerteschaltung eingerichtet ist, ein Signal an eine Warneinrichtung zu geben, wenn das Ausgangs¬ signal des Körperschall-Aufnehmers in einer vorge¬ gebenen Zeit eine vorgegebene Intensitätsänderung aufweist, z.B. wenn die Intensität zwischen zwei Zeitpunkten einen vorgegebenen Schwellenwert überschreitet.According to the invention, this object is achieved in that the evaluation circuit is set up to send a signal to a warning device if the output signal of the structure-borne sound sensor has a predetermined change in intensity in a predetermined time, e.g. if the intensity between two points in time exceeds a predetermined threshold.
Vorteilhaft ist es, wenn die Auswerteschaltung die Intensität periodisch in regelmässigen Zeitabständen mittels eines Komparators prüft und ein Warnsignal auslöst, falls zwischen mindestens zwei aufeinander folgenden Messzeitpunkten die Intensität einen Schwellenwert überschritten hat, und wenn das Warnsignal so lange gehalten wird, bis die Intensität zwischen zwei späteren Messzeitpunkten wieder unter einen vorgegebenen Schwellenwert abgesunken ist.It is advantageous if the evaluation circuit checks the intensity periodically at regular time intervals using a comparator and triggers a warning signal if the intensity has exceeded a threshold value between at least two successive measurement times, and if the warning signal is maintained until the intensity between two later measurement times has fallen below a predetermined threshold.
Besonders vorteilhaft ist es, wenn mehrere Schwellen¬ werte vorgesehen sind, und ein Warnsignal dann ausgelöst wird, wenn die Intensität des Körperschalls in einem spezifischen Frequenzbereich in vorbestimmten Zeitabständen nacheinander die beiden Schwellenwerte durchschritten hat, was ein untrügliches Zeichen für ein Objekt mit stetig zunehmender Intensität des erzeugten Körperschalls ist.It is particularly advantageous if several threshold values are provided and a warning signal is triggered when the intensity of the structure-borne noise has successively passed the two threshold values in a specific frequency range at predetermined time intervals, which is an unmistakable sign for an object with a continuously increasing intensity of the structure-borne noise generated.
Gewerbliche AnwendungCommercial application
Eine derartige Anordnung lässt sich mit Vorteil z.B. für den Nachweis eines herannahenden Fahrzeuges verwenden. Insbesondere ist sie zum Nachweis eines Schienenfahrzeuges, z.B. eines Eisenbahnzuges oder einer Lokomotive auf einem Geleise geeignet, um z.B. eine eine Geleisebau-Equipe vor einem herannahenden Zug zu warnen oder rechtzeitig eine Barriere an einem Strassenübergang zu schliessen und wieder zu öffnen. Die Körperschall-Aufnehmer sind dabei an den Schienen angebracht und registrieren den vom Zug erzeugten und über die Schienen zum Messort übertragenen Körper¬ schall, dessen Intensität beim Herannahen eines Zuges stetig zunimmt. Die spezielle Signalauswertung sorgt dabei dafür, dass mit grösstmöglicher Sicherheit ein Warnsignal ausgelöst wird, auch wenn Störgeräusche vorhanden sind, dass aber trotzdem eine gewisse Selektivität gewährleistet ist, so dass ein Unfall mit in der Regel katastrophalen Folgen mit grösserer Sicherheit vermieden werden kann, als wenn man sich auf eine häufig unzuverlässige menschliche Beobachtung verlässt, insbesondere unter ungünstigen Wetter¬ bedingungen, wie Nebel, oder bei Uebermüdung oder sonstigem Fehlverhalten des Wachpersonals. Kurze Beschreibung der ZeichnungenSuch an arrangement can advantageously be used, for example, for the detection of an approaching vehicle. In particular, it is suitable for the detection of a rail vehicle, e.g. a train or a locomotive on a track, for example to warn a track construction team of an approaching train or to close and reopen a barrier at a road crossing in good time. The structure-borne noise transducers are attached to the rails and register the structure-borne noise generated by the train and transmitted via the rails to the measuring location, the intensity of which increases steadily as a train approaches. The special signal evaluation ensures that a warning signal is triggered with the greatest possible certainty, even if there are noises, but that a certain selectivity is nevertheless guaranteed, so that an accident with usually catastrophic consequences can be avoided with greater certainty than if one relies on frequently unreliable human observation, in particular under unfavorable weather conditions, such as fog, or in the event of fatigue or other misconduct on the part of the security personnel. Brief description of the drawings
Die Erfindung wird an Hand der beiliegenden Figuren näher erläutert. Es zeigen:The invention is explained in more detail with reference to the accompanying figures. Show it:
Fig. 1 ein Ausführungsbeispiel einer Anordnung zur Signalisisierung eines herannahenden Zuges an einer entfernten Geleisebaustelle mit einer zugehörigen Auswerteschaltung in schematischer Darstellung,1 shows an embodiment of an arrangement for signaling an approaching train at a remote track construction site with an associated evaluation circuit in a schematic representation,
Fig. 2 ein Funktionsdiagramm für die Signalauswertung zur Warnsignalgabe, undFig. 2 is a functional diagram for signal evaluation for warning signaling, and
Fig. 3 ein Funktionsdiagramm einer anderen Signal¬ auswerteschaltung.3 shows a functional diagram of another signal evaluation circuit.
Wege zur Ausführung der ErfindungWays of Carrying Out the Invention
In Figur 1 ist eine Anordnung zur Feststellung eines Objektes in der Form eines auf einem Geleise 1 an eine Geleisebaustelle B herannahenden Zuges 2 gezeigt. Der Zug 2 oder die Lokomotive erzeugt in den Schienen 1 ein charakterisches Körperschall-Geräusch, "das über die Schienen als schalleitendes Medium mit Schall- geschwindigkei, d.h. mit einigen k /sec vom Zug 2 zur Baustelle B weitergeleitet wird. Dort ist an einer oder an beiden Schienen ein Körperschallaufnehmer 3 fest, d.h. in gutem schalleitenden Kontakt angebracht. Zweck- massig ist es, einen Schallaufnehmer mit einem piezo¬ elektrischen akustisch/elektrischen Wandler vorzusehen, oder einen Körperschallaufnehmer anderer bekannter Ausführung. Dieser Aufnehmer 3 gibt, ein elektrisches Ausgangssignal ab, das einer Signalauswerteschaltung C zugeleitet wird.FIG. 1 shows an arrangement for ascertaining an object in the form of a train 2 approaching a track construction site B on a track 1. The train 2 or the locomotive generates a characteristic structure-borne noise in the rails 1 ", which is transmitted via the rails as a sound-conducting medium with sound speed, ie with a few k / sec from the train 2 to the construction site B. There is one or on both rails, a structure-borne sound sensor 3 is fixed, that is, in good sound-conducting contact, it is expedient to provide a sound sensor with a piezoelectric acoustic / electrical transducer, or a structure-borne sound sensor of another known design Output signal from which is fed to a signal evaluation circuit C.
Die Auswerteschaltung C weist an ihrem Eingang ein Frequenzglied 4 auf, das einen Frequenzdurchlass¬ bereich aufweist, der an das FrequenzSpektrum eines fahrenden Zuges angepasst ist und vorzugsweise im kHz-Bereich gewählt wird. Dadurch wird das von einem Zug in den Schienen erzeugte Geräusch sicher erfasst, Störgeräusche anderer Frequenz, z.B. niederfrquente Bodenerschütterungen jedoch eliminiert und von der Auswertung ferngehalten.The evaluation circuit C has a frequency element 4 at its input, which has a frequency passband that is adapted to the frequency spectrum of a moving train and is preferably selected in the kHz range. As a result, the noise generated by a train in the rails is reliably detected, noise of a different frequency, e.g. however, low-frequency ground vibrations are eliminated and kept away from the evaluation.
Zweckmässig ist es, den Körperschallaufnehmer 4 akustisch nach aussen zu isolieren, um die Uebertragung von Störgeräuschen über die Luft zu blockieren.It is expedient to acoustically isolate the structure-borne sound sensor 4 from the outside in order to block the transmission of interference noises via the air.
Das Ausgabgssignal wird dann einem Zeitdiskriminator 5 zugeleitet, der von einem Taktgeber 6 angesteuert wird. Der Zeitdiskriminator erzeugt zwei Ausgangssignale für die Intensität des aufgenommenen Körperschalls in dem gewählten Frequenzbereiches zu zwei verschiedenen Zeitpunkten. Diese beiden gegeneinander zeitver¬ schobenen Signale gelengen an die Eingänge eines Komparators 7, der fortlaufend die Intensitäten jeweils zweier aufeinander folgender Signalintensitäten mit¬ einander vergleicht und an eine Warneinrichtung 8 ein Signal gibt, sobald sich die beiden Intensitäten um ein vorgegebenes Mass unterscheiden. Dabei kann es sich um die Auslösung oder Einschaltung eines Wamsignales für die Bauequipe handeln, wenn die Intensität bei Annäherung eines Zuges um ein bestimmtes Mass angestiegen ist, oder um die Rückstellung oder Abschaltung des Warnsignales bei Absinken der Intensität bei einem sich entfernenden Zuges.The output signal is then fed to a time discriminator 5, which is controlled by a clock generator 6. The time discriminator generates two output signals for the intensity of the structure-borne noise recorded in the selected frequency range at two different times. These two signals, which are time-shifted relative to one another, are applied to the inputs of a comparator 7, which continuously compares the intensities of two successive signal intensities with one another and sends a signal to a warning device 8 as soon as the two intensities differ by a predetermined amount. This can be the triggering or activation of a doublet signal for the construction team if the intensity when a train approaches a certain amount has risen, or to reset or switch off the warning signal when the intensity drops when a train moves away.
Figur zeigt ein Beispiel eines Funktionsschemas der Auswerteschaltung C. Die Kurve zeigt den zeitlichen Verlauf der Intensität I des Ausgangssignales des Aufnehmers 3 im gewählten Frequenzbereich. Der Komparator 7 der Auswerteschaltung vergleicht die Intensitäten zu jeweils aufeinander folgenden Zeit¬ punkten tl, t2, t3 ...etc., und stellt insbesondere fest, ob bei zwei Zeitpunkten ein vorgegebener Schwellenwert T überschritten wurde. Bei dem dargestellten Beispiel wurde zwar kurzzeitig zwischen den Messzeiten tl und t2 der Schwellenwert T überschritten, z.B. infolge einer kurzzeitigen Einwirkung wie einem Schlag auf die Schiene, jedoch liegt die Intensität bei beiden Meεszeiten unterhalb des Schwellenwertes, so dass in diesem Falle kein Warnsignal ausgelöst wird. Zwischen den Messzeiten t2 und t3 steigt jedoch die Intensität allmählich an und durchquert zwischen t2 und t3 den Schwellenwert T. In diesem Falle wird also bei t3 ein Warnsignal ausgelöst, das einen herannahenden Zug signalisiert. Solange dann die Intensität bei den folgenden Messzeiten oberhalb der Schwelle T bleibt, wird das Warnsignal gehalten, auch wenn es, wie zwischen t4 und t5 gezeigt, kurzzeitig wieder unter die Schwell T absinken sollte. Erst wenn die Intensität allmählich abnimmt, wie zwischen t6 und t7 dargestellt, wird das Warnsignal zuückgestellt, als Zeichen dafür, dass sich der Zug wieder entfernt hat. Fig. 3 zeigt an Hand eines analogen Funktionsschemas eine vorteilhafte Weiterbildung der Erfindung. Hierbei sind zwei gestaffelte Schwellenwerte Tl und T2 für die Intensität I vorgesehen. Solange die Intensität unterhalb der unteren Schwelle Tl bleibt, erfolgt keine Reaktion, wenn zu zwei Messzeiten tl und t2 die untere Schwelle überschritten wurde, wird zunächst ein Vorwarnsignal ausgelöst, z.B. eine Warneinrichtung aktiviert und betriebsbereit gemacht. Bei Absinken der Intensität unter die Schwelle Tl zum Zeitpunkt t4 wird das Vorwarnsignal wieder zurückgestellt, bis es z.B. zum Zeitpunkt t5 infolge abermaligen Ueberschreitens der Schwelle wiederum aktiviert wird. Erfolgt dann ein weiterer Anstieg der Intensität bis über den oberen Schwellenwert T2, z.B. zur Messzeit t6, so wird zu diesem Zeitpunkt das Hauptwarnsignal ausgelöst und damit das Herannahen eines Zuges signalisiert.Figure shows an example of a functional diagram of the evaluation circuit C. The curve shows the time course of the intensity I of the output signal of the sensor 3 in the selected frequency range. The comparator 7 of the evaluation circuit compares the intensities at successive times t1, t2, t3 ... etc., and in particular determines whether a predetermined threshold value T has been exceeded at two times. In the example shown, the threshold value T was exceeded briefly between the measuring times t1 and t2, for example as a result of a brief action such as a blow to the rail, but the intensity for both measuring times is below the threshold value, so that in this case no warning signal is triggered . Between the measuring times t2 and t3, however, the intensity gradually increases and crosses the threshold value T between t2 and t3. In this case, a warning signal is triggered at t3, which signals an approaching train. As long as the intensity then remains above the threshold T during the subsequent measurement times, the warning signal is held, even if it should briefly drop below the threshold T again, as shown between t4 and t5. Only when the intensity gradually decreases, as shown between t6 and t7, is the warning signal reset, as a sign that the train has left again. FIG. 3 shows an advantageous development of the invention using an analog functional diagram. Two staggered threshold values T1 and T2 are provided for the intensity I. As long as the intensity remains below the lower threshold Tl, there is no reaction. If the lower threshold has been exceeded at two measuring times tl and t2, a prewarning signal is triggered first, for example a warning device is activated and made ready for operation. If the intensity drops below the threshold T1 at time t4, the prewarning signal is reset until it is activated again, for example at time t5, because the threshold is exceeded again. If the intensity then increases further beyond the upper threshold value T2, for example at the measurement time t6, the main warning signal is triggered at this point in time and the approach of a train is thus signaled.
Die Auswertesachaltung C kann im Rahmen des Erfindungs¬ gedankens auch anders aufgebaut sein. Um ihre Funktion zu erfüllen, muss sie eingerichtet sein, eine vorge¬ gebene Erhöhung (oder Abnahme) des Ausgangssignals des Körperschallaufnehmers in einem vorgegebenem Zeitraum zu signalisieren. Mit Vorteil kann die Auswertung auch mit einem Mikroprozessor vorgenommen werden. Anstatt digital kann die Auswertung auch analog durchgeführt werden. Z.B. kann der Diskriminator 5 bei Ueberschrei- tung einer unteren Schwelle Tl einen Zeitschalter aktivieren, der nach Ablauf einer vorgegebenen Ver¬ zögerunszeit den Diskriminator veranlasst, zu prüfen, ob das Signal zu diesem Zeitpunkt die obere Schwelle T2 überschritten hat, oder innerhalb eines' bestimmten Zeitfensters .diese. Schwelle T2 überschreitet. Es ist auch vorteilhaft, an beiden Schienen eines Geleises je einen Körperschallaufnehmer vorzusehen, wobei die Signale beider Aufnehmer in einer Tor¬ schaltung verarbeitet werden, vorzugsweise mit einem ODER-Tor, so dass in jedem Fall ein Signal gegeben, wenn einer der Aufnehmer aus irgendeinem Grund kein Signal liefern sollt, oder aber mit einem UND-Tor, um Störungen durch zufällige Schallschwingen in nur einer Schiene zu eliminieren.The evaluation device C can also be constructed differently within the scope of the inventive concept. In order to fulfill its function, it must be set up to signal a predetermined increase (or decrease) in the output signal of the structure-borne noise sensor in a predetermined period. The evaluation can also advantageously be carried out using a microprocessor. Instead of digital, the evaluation can also be carried out analog. For example, the discriminator 5 can at exceeded, a lower threshold Tl activate a timer which zögerunszeit the discriminator made to check if the signal has exceeded at which time the upper threshold T2, or after a predetermined Ver¬ particular within a ' Time window .this. Threshold T2 exceeds. It is also advantageous to provide a structure-borne noise sensor on each of the two rails of a track, the signals from both sensors being processed in a gate circuit, preferably with an OR gate, so that a signal is given in any case if one of the sensors is from any one Reason should not deliver a signal, or with an AND gate in order to eliminate interference from random sound vibrations in only one rail.
Es sei bemerkt, dass sich die Erfindung auch zur Fest¬ stellung anderer Objekte verwenden lässt, sofern diese an einem enfernten Messort Körperschall mit stetig zunehmender Intensität verursachen, z.B. zur Signali- sation der Annäherung von Strassenfahrzeugen, z.B. Kettenfahrzeugen an einen bestimmten Ort durch Detektion der Bodenerschütterungen, und zur Auslösung entsprechender Massnahmen It should be noted that the invention can also be used for the detection of other objects, provided that they cause structure-borne noise with a continuously increasing intensity at a remote measuring location, e.g. for signaling the approach of road vehicles, e.g. Tracked vehicles to a specific location by detecting ground vibrations and triggering appropriate measures

Claims

Patentansprüche Claims
1. Anordnung zur Feststellung eines Objektes (2) mit einem Körperschall-Aufnehmer (3) zur Detektion der vom Objekt (2) erzeugten und in einem schalleitenden Medium (1) zum Aufnehmer (3) übertragenen Körperschalles (S) , und mit einer Auswerteschaltung (C) , welche vom Auf¬ nehmer (3) ein Ausgangssignal empfängt und ein Warn¬ signal (8) abgibt, wenn dieses Ausgangssignal vorge¬ gebene Kriterien erfüllt, dadurch gekennzeichnet, dass die Auswerteschaltung (C) einegrichtet ist, ein Signal (Sw) an eine Warneinrichtung (8) zu geben, wenn das1. Arrangement for the detection of an object (2) with a structure-borne sound sensor (3) for detecting the structure-borne sound (S) generated by the object (2) and transmitted in a sound-conducting medium (1) to the sensor (3), and with an evaluation circuit (C), which receives an output signal from the transducer (3) and emits a warning signal (8) when this output signal fulfills predetermined criteria, characterized in that the evaluation circuit (C) is set up, a signal (Sw ) to a warning device (8) if that
Ausgangssignal (Sa) des Körperschall-Aufnehmers (3) in einer vorgegebenen Zeit eine vorgegebene Intensitäts¬ änderung aufweist.Output signal (Sa) of the structure-borne noise sensor (3) has a predetermined intensity change in a predetermined time.
2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, dass die Auswerteschaltung (C) einen Komparator (7) aufweist, welcher die Intensität des Ausgangssignales (Sa) zu mindestens zwei verschiedenen Zeitpunkten vergleicht und ein Warnsignal (Sw) auslöst, wenn die Intensitäts- änderung zwischen den beiden Zeitpunkten (t2, t3) über einen vorgegebenen Schwellenwert (T) angestiegen ist.2. Arrangement according to claim 1, characterized in that the evaluation circuit (C) has a comparator (7) which compares the intensity of the output signal (Sa) at at least two different times and triggers a warning signal (Sw) when the intensity change between the two times (t2, t3) has risen above a predetermined threshold value (T).
3. Anordnung nach Anspruch 2, dadurch gekennzeichnet, dass die Auswerteschaltung (C) eingerichtet ist, die Intensität des Ausgangssignales (Sa) in regelmässigen Zeitabständen (tl, t2, t3...) festzustellen und ein Warnsignal (Sw) festzuhalten, bis die Intensität wieder unter die Schwelle (T) abgesunken ist. 3. Arrangement according to claim 2, characterized in that the evaluation circuit (C) is set up to determine the intensity of the output signal (Sa) at regular time intervals (tl, t2, t3 ...) and to hold a warning signal (Sw) until the Intensity has dropped below the threshold (T) again.
4. Anordnung nach Anspruch 2 oder 3, dadurch gekenn¬ zeichnet, dass die Auswerteschaltung (C) eingerichtet ist, die Intensität des Ausgangssignales (Sa) zu mehreren Zeitpunkten festzustellen und ein Vorwarn¬ signal auszulösen, wenn die Intensität des Ausgangs¬ signales (Sa) zwischen einem ersten und einem zweiten Zeitpunkt einen vorgegebenen unteren Schwellenwert (Tl) überstiegen hat, und ein Hauptsignal auzulδsen, wenn die Intensität zwischen zwei weiteren Zeitpunkten einen vorgegebenen zweiten, höheren Schwellenwert (T2) überschritten hat.4. Arrangement according to claim 2 or 3, characterized gekenn¬ characterized in that the evaluation circuit (C) is set up to determine the intensity of the output signal (Sa) at several points in time and to trigger a warning signal when the intensity of the output signal (Sa ) has exceeded a predetermined lower threshold value (Tl) between a first and a second point in time, and to trigger a main signal if the intensity has exceeded a predetermined second, higher threshold value (T2) between two further points in time.
5. Anordnung nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, dass die Auswerteschaltung (C) ein Frequenzfilter (4) aufweist, dessen Frequenzdurchlass¬ bereich dem Frequenzbereich der von dem festzustellen¬ den Körperschallschwingungen (S) entspricht.5. Arrangement according to one of claims 1-4, characterized in that the evaluation circuit (C) has a frequency filter (4) whose frequency passband corresponds to the frequency range of the structure-borne noise (S) to be determined.
6. Verwendung der Anordnung nach einem der Ansprüche 1 - 5 zur Feststellung eines herannahenden, an einen Untergrund (1) als schalleitendes Medium Körperschall¬ schwingungen (S) abgebenden Fahrzeuges (2) .6. Use of the arrangement according to one of claims 1-5 for the detection of an approaching structure-borne sound (S) emitting vehicle (2) to a substrate (1) as sound-conducting medium.
7. Verwendung nach Anspruch 6, dadurch gekennzeichnet, dass das Fahrzeug (2) ein Schienenfahrzeug, z.B. ein Eisenbahnfahrzeug oder dergleichen ist, und dass als schalleitendes Medium wenigstens eine Schiene (1) dient, auf der sich das Fahrzeug bewegt. 7. Use according to claim 6, characterized in that the vehicle (2) is a rail vehicle, for example a railway vehicle or the like, and that at least one rail (1) on which the vehicle is moving serves as the sound-conducting medium.
8. Verwendung nach Anspruch 7, dadurch gekennzeichnet dass als schalleitendes Medium (1) mehrere Schienen dienen, auf denen sich dass Fahrzeug bewegt, und dass an jeder Schiene ein Körperschall-Aufnehmer (2) vorge¬ sehen ist, wobei die Ausgangssignale (Sa) der Aufnehmer (2) in einer TorSchaltung miteinander verbunden sind. 8. Use according to claim 7, characterized in that a plurality of rails serve as sound-conducting medium (1), on which the vehicle is moving, and that a structure-borne sound sensor (2) is provided on each rail, the output signals (Sa) the transducer (2) are connected to each other in a gate circuit.
EP91900710A 1990-01-12 1991-01-03 Arrangement for identifying an object by means of structure-borne noise, and use of said arrangement Expired - Lifetime EP0463127B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH96/90A CH679847A5 (en) 1990-01-12 1990-01-12
CH96/90 1990-01-12
PCT/CH1991/000001 WO1991010584A1 (en) 1990-01-12 1991-01-03 Arrangement for identifying an object by means of structure-borne noise, and use of said arrangement

Publications (2)

Publication Number Publication Date
EP0463127A1 true EP0463127A1 (en) 1992-01-02
EP0463127B1 EP0463127B1 (en) 1994-09-14

Family

ID=4179161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91900710A Expired - Lifetime EP0463127B1 (en) 1990-01-12 1991-01-03 Arrangement for identifying an object by means of structure-borne noise, and use of said arrangement

Country Status (8)

Country Link
US (1) US5265831A (en)
EP (1) EP0463127B1 (en)
JP (1) JPH04504241A (en)
AT (1) ATE111404T1 (en)
CA (1) CA2049023A1 (en)
CH (1) CH679847A5 (en)
DE (1) DE59102905D1 (en)
WO (1) WO1991010584A1 (en)

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4428784A1 (en) * 1994-08-13 1996-02-15 Ee Signals Gmbh & Co Kg Procedures for the detection of sources of danger
US5713540A (en) * 1996-06-26 1998-02-03 At&T Corp. Method and apparatus for detecting railway activity
JP3984653B2 (en) * 1996-08-20 2007-10-03 日本信号株式会社 Information generator using elastic waves
US5735491A (en) * 1996-10-09 1998-04-07 Michael D. Ray Method and apparatus for detecting an approaching train by detecting a brake system status signal
US5924651A (en) * 1997-03-26 1999-07-20 Penza; George Gregory Tactile and audible warning system for railroad workers
CA2208499A1 (en) 1997-06-16 1998-12-16 Hydro-Quebec Electrically audible motorized wheel assembly and method thereof
US6715354B2 (en) 1998-02-24 2004-04-06 Massachusetts Institute Of Technology Flaw detection system using acoustic doppler effect
JPH11342845A (en) * 1998-06-04 1999-12-14 Mitsubishi Electric Corp Train detecting device, train position detecting system, and train approach alarm generating device
DE19826090A1 (en) * 1998-06-12 1999-12-16 Alcatel Sa Method and device for checking the integrity of a rail-bound vehicle group
US6035719A (en) * 1998-08-05 2000-03-14 Kabushiki Kaisha Alpha Tsushin Noise/vibration measuring and disclosing system
DE19858937A1 (en) * 1998-12-08 2000-06-15 Gerd Klenke Monitoring rail traffic along railway line by evaluating sound spectrum to detect periodic events indicating faults
US6728515B1 (en) 2000-02-16 2004-04-27 Massachusetts Institute Of Technology Tuned wave phased array
US6416021B2 (en) * 2000-05-30 2002-07-09 George Jefferson Greene, Jr. Locomotive whistle controlled railroad grade crossing warning system
US6833554B2 (en) * 2000-11-21 2004-12-21 Massachusetts Institute Of Technology Laser-induced defect detection system and method
AU2003267880B2 (en) * 2002-09-20 2009-10-08 Brent Felix Jury Apparatus for and methods of stress testing metal components
US6951132B2 (en) * 2003-06-27 2005-10-04 General Electric Company Rail and train monitoring system and method
US20050183900A1 (en) * 2004-01-28 2005-08-25 Gerold Goertzen Wheelchair
US7999848B2 (en) * 2004-06-11 2011-08-16 Stratech Systems Limited Method and system for rail track scanning and foreign object detection
US7481400B2 (en) * 2005-07-01 2009-01-27 Portec, Rail Products Ltd. Railway wheel sensor
CN1887628B (en) * 2006-07-24 2010-07-07 北京交通大学 Sound controlled automatic warning device and method for unattended level railway crossing
DE102007006833A1 (en) * 2007-02-07 2008-08-14 Deutsches Zentrum für Luft- und Raumfahrt e.V. Action e.g. switching operation, triggering device for railway system, has sensors detecting acoustic signals, where device detects rail-mounted vehicle located on track system based on signals and triggers action based on vehicle detection
US8423240B2 (en) * 2008-06-30 2013-04-16 International Electronic Machines Corporation Wireless railroad monitoring
DE102008046565A1 (en) * 2008-09-10 2010-03-18 Siemens Aktiengesellschaft Detection device i.e. body sound sensor, for detection of e.g. goods train on rails, has signal evaluation mechanism for evaluating detected body sound signal and detecting train when signal exhibits rolling noise characteristic of train
WO2011001684A1 (en) * 2009-07-02 2011-01-06 パナソニック株式会社 Vehicle position detecting device and vehicle position detecting method
GB0915322D0 (en) 2009-09-03 2009-10-07 Westinghouse Brake & Signal Railway systems using fibre optic hydrophony systems
NO331979B1 (en) * 2010-09-17 2012-05-14 Stiftelsen Norsar System and method for early detection of trains
AU2015203583B2 (en) * 2010-09-17 2017-06-22 Wavetrain Systems System and method for early train detection
RU2457135C2 (en) * 2010-12-03 2012-07-27 Открытое акционерное общество "Научно-исследовательский институт технической физики и автоматизации" (ОАО "НИИТФА") Rail haulage safety monitoring device
KR20130001652A (en) * 2011-06-27 2013-01-04 엘에스산전 주식회사 The system for measuring the train location using the wireless train sensing unit
DE102012217627A1 (en) * 2012-09-27 2014-03-27 Siemens Aktiengesellschaft Method for operating a rail vehicle in a railway system and railway system
DE102014013472A1 (en) * 2013-09-30 2015-04-02 Hella Kgaa Hueck & Co. Method for detecting and classifying damage events on motor vehicles and device therefor
US11279387B2 (en) * 2014-03-31 2022-03-22 Vossloh Signaling, Inc. Train direction detection apparatus and method
US10179596B2 (en) * 2015-07-17 2019-01-15 Harsco Technologies LLC Rail warning system and method
DE102016108273A1 (en) * 2016-05-04 2017-11-09 senvisys UG (haftungsbeschränkt) Method for evaluating signals of at least one vibration sensor
CN112543725B (en) 2018-08-30 2021-09-21 奥钢联信号美国有限公司 Railcar acoustic monitoring system and method of use thereof
AT524382B1 (en) * 2020-10-16 2022-07-15 Plasser & Theurer Export Von Bahnbaumaschinen Gmbh Method and system for determining vibration transmission in the area of a track

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190321895A (en) * 1903-10-12 1904-03-17 Walter Edward Joseph Knight Improvements relating to Tapping Casks and the like.
US1788182A (en) * 1928-08-22 1931-01-06 Union Switch & Signal Co Highway-crossing signal
US1748965A (en) * 1929-01-21 1930-03-04 Watson Ernest Railway-crossing signal
US1834077A (en) * 1930-07-30 1931-12-01 Union Switch & Signal Co Highway crossing signal
US1864016A (en) * 1930-12-15 1932-06-21 Avertisseur Ferrovoie Soc D Automatic signaling device operated by the oscillations of the rails
US2011658A (en) * 1934-01-12 1935-08-20 Union Switch & Signal Co Train communicating apparatus for railways
FR802209A (en) * 1934-12-29 1936-08-31 New device to detect, reveal, announce or signal the approach of a vehicle on rails
US2346748A (en) * 1941-10-08 1944-04-18 Union Switch & Signal Co Control apparatus
US2592163A (en) * 1949-09-07 1952-04-08 Sydney W Madden Audible railroad crossing warning signal
US3978447A (en) * 1975-07-01 1976-08-31 Lawrence Peska Associates, Inc. Safety transmitting device
US4167877A (en) * 1978-05-17 1979-09-18 Avery Hazelton H Method and instrument for vibration analysis
CH643078A5 (en) * 1978-11-30 1984-05-15 Cerberus Ag PROCESS AND ARRANGEMENT FOR THE BURGLAR REPORT.
FR2463707A1 (en) * 1979-08-23 1981-02-27 Sncf METHOD AND DEVICE FOR DETECTING DEDICATION (S) ON RAILWAYS OR APPROACHING TRAINS
SU1066867A1 (en) * 1981-06-02 1984-01-15 Московский Государственный Проектно-Изыскательский Институт "Мосгипротранс" Track alarm
SU1066868A1 (en) * 1982-04-02 1984-01-15 Lazarenko Yurij V Train approach warning device
SU1175778A1 (en) * 1984-03-16 1985-08-30 Харьковский Государственный Институт Промышленного Транспорта Device for giving warning to approaching rolling stock
US4887032A (en) * 1988-05-02 1989-12-12 Ford Motor Company Resonant vibrating structure with electrically driven wire coil and vibration sensor
US4932618A (en) * 1989-04-11 1990-06-12 Rockwell International Corporation Sonic track condition determination system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9110584A1 *

Also Published As

Publication number Publication date
DE59102905D1 (en) 1994-10-20
CA2049023A1 (en) 1991-07-13
EP0463127B1 (en) 1994-09-14
ATE111404T1 (en) 1994-09-15
US5265831A (en) 1993-11-30
WO1991010584A1 (en) 1991-07-25
CH679847A5 (en) 1992-04-30
JPH04504241A (en) 1992-07-30

Similar Documents

Publication Publication Date Title
EP0463127B1 (en) Arrangement for identifying an object by means of structure-borne noise, and use of said arrangement
DE10164760B4 (en) Ultrasonic obstacle detector for vehicle, judges adherence of snow or mud on each sensor, based on wave receiving level of sensors
DE102006028004B4 (en) Rail vehicle with gravel flight detection
DE19852220C2 (en) Process for the detection of damage in rail traffic
WO2013050244A1 (en) Rail fracture detection method and device
EP1422119A1 (en) Inductive derailment sensor
EP0514702A1 (en) Detection method of unwanted modifications or manipulations on long vibration guiding members
DE2260352A1 (en) DEVICE FOR DETECTION OF DAMAGE TO GLASS PANELS OR SIMILAR
WO2020173646A1 (en) Device and method for ascertaining acoustic events in a track using acoustic sensors
EP3158344B1 (en) Derailing recognition method and device
DE4219067A1 (en) Warning personnel and vehicles in track area of railway lines - protecting against approaching and passing railway vehicles, also departing vehicles, using source producing continuous body sound signals in track rails.
DE2735422A1 (en) DEVICE FOR DETECTING A VEHICLE POSITION
DE102007006833A1 (en) Action e.g. switching operation, triggering device for railway system, has sensors detecting acoustic signals, where device detects rail-mounted vehicle located on track system based on signals and triggers action based on vehicle detection
DE19748602A1 (en) Axle counting switch comprising two proximity switches one behind other e.g. for railway wheel passage
DE102006041705B3 (en) Crew warning system, has recognizing device disconnected regularly such that warning signal of moving warning sensor is uncontrolled by recognizing reflection of signal delivered by fixed sensors when fixed sensors do not have signal
EP3765346B1 (en) Method for controlling a level crossing and railway control arrangement
DE19946227C1 (en) Rail breakage detection method for train track uses evaluation of acoustic oscillations obtained from track rail under dynamic loading
DE102020112307A1 (en) Method for determining a collision object external to the vehicle, as well as detection device and motor vehicle
DE10065954A1 (en) Monitoring track systems, involves subjecting rail bodies to transient signal at periodic intervals, detecting sound in sold signal at any point with acceleration sensor, transient recorder
DE102007019137B4 (en) Device and method for monitoring a rail-bound vehicle association
DE10127277A1 (en) Inductive train safety system has detected current drop in onboard oscillation circuit compared with threshold value obtained from rest current of onboard oscillation circuit
EP1491864A2 (en) Method and device for testing the functioning of an inductive sensor
CH682702A5 (en) Machine failure detection system based on emitted noise - uses evaluating circuit to deliver an alarm initiating signal if output signal of sound pick=up undergoes set change in intensity in predetermined period
DE3909073C2 (en)
DE19954760A1 (en) Monitoring railway track to determine damaged point of track to prevent derailment, using acoustic receivers directly on tracks to record acoustic signal from track for evaluation

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19911204

17Q First examination report despatched

Effective date: 19930819

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19940914

Ref country code: GB

Effective date: 19940914

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19940914

Ref country code: DK

Effective date: 19940914

Ref country code: BE

Effective date: 19940914

Ref country code: NL

Effective date: 19940914

Ref country code: FR

Effective date: 19940914

REF Corresponds to:

Ref document number: 111404

Country of ref document: AT

Date of ref document: 19940915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59102905

Country of ref document: DE

Date of ref document: 19941020

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19941214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19950103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19950131

EN Fr: translation not filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19940914

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19950418

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19951003

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19960131

Ref country code: LI

Effective date: 19960131

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL