Method and device for monitoring bogies of multi-axle vehicles
First Claim
1. A method of monitoring a bogie of a multi-axle vehicle guided on a running surface, the method which comprises:
- detecting respective accelerations of at least two axles of the bogie with acceleration sensors;
subjecting sensor signals received from the acceleration sensors to a Fourier transformation in FFT modules provided in an adaptation stage and generating frequency profiles with the FFT modules;
selecting one or more comparison operations from the following group;
comparing the frequency profiles, in a first check module, to one another, to originally measured frequency profiles, and/or to a correspondingly selected standard profile;
comparing the frequency profiles, in a second check module, to respective average value profiles formed in storage stages; and
comparing the average value profiles formed in storage stages directly to each other, to originally measured frequency profiles, and/or to a correspondingly selected standard profile; and
comparing determined deviations to threshold values, and accordingly delivering message signals to systems serving to control the vehicle.
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Accused Products
Abstract
The behavior of the bogie of a muliple-axle vehicle is monitored. Accelerations of at least two axles of the bogie are measured with acceleration sensors allocated to the axles. The sensor signals are subjected to a Fourier transformation in FFT units. The frequency profiles resulting from the Fourier transform are compared with profiles that are stored in memory. Differences that are detected are compared with threshold values and messages are correspondingly sent to the system that controls the vehicle. The monitoring system allows mechanical operating errors of the bogie to be detected independently of effects caused by the running surface upon which the vehicle travels.
14 Citations
20 Claims
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1. A method of monitoring a bogie of a multi-axle vehicle guided on a running surface, the method which comprises:
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detecting respective accelerations of at least two axles of the bogie with acceleration sensors;
subjecting sensor signals received from the acceleration sensors to a Fourier transformation in FFT modules provided in an adaptation stage and generating frequency profiles with the FFT modules;
selecting one or more comparison operations from the following group;
comparing the frequency profiles, in a first check module, to one another, to originally measured frequency profiles, and/or to a correspondingly selected standard profile;
comparing the frequency profiles, in a second check module, to respective average value profiles formed in storage stages; and
comparing the average value profiles formed in storage stages directly to each other, to originally measured frequency profiles, and/or to a correspondingly selected standard profile; and
comparing determined deviations to threshold values, and accordingly delivering message signals to systems serving to control the vehicle. - View Dependent Claims (2, 3, 4, 5)
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6. A method of monitoring a bogie of a multi-axle vehicle guided on a running surface, the method which comprises:
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detecting respective accelerations of at least two axles of the bogie with acceleration sensors;
shifting sensor signals received from the acceleration sensors relative to one another with a controllable timing element, to compensate for a time difference between instants at which the wheels of the bogie respectively pass a given point on the running surface;
subtracting the shifted signal curves from one another in a difference stage to form a resulting signal curve sres=s11a−
*s11b representing a condition of the bogie; and
comparing the resulting signal curve to at least one threshold value or threshold value profile in a signal processing unit. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 19, 20)
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16. A device for monitoring a bogie of a multi-axle vehicle guided on a running surface, comprising:
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a plurality of acceleration sensors respectively disposed for sensing vibrations of at least two axles of the bogie and configured to convert vibrations of the axles into sensor signals;
a signal processing unit connected to said sensors for receiving the sensor signals for further evaluation;
an adaptation stage having at least one FFT module connected to receive the sensor signals from said acceleration sensors and for outputting frequency profiles;
at least one comparison unit selected from the group of units consisting of;
a first check module configured for one of comparing the frequency profiles to one another, comparing the frequency profiles to originally measured frequency profiles, and comparing the frequency profiles to a correspondingly selected standard profile;
storage stages, and a second check module configured to compare the frequency profiles to respective average value profiles formed in said storage stages; and
a comparator for comparing the average value profiles formed in the storage stages directly to each other, to originally measured frequency profiles, or to a correspondingly selected standard profile; and
a device for comparing the determined deviations with threshold values, and for delivering messages accordingly to systems serving to control the vehicle.
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17. A device for monitoring a bogie of a multi-axle vehicle guided on a running surface, comprising:
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a plurality of acceleration sensors respectively disposed for sensing vibrations of at least two axles of the bogie and configured to convert vibrations of the axles into sensor signals;
a controllable timing element connected to receive the sensor signals for shifting the sensor signals relative to one another to compensate for a time difference between instants at which the wheels of the bogie respectively pass a given point on the running surface;
a difference stage for subtracting the shifted signal curves from one another to form a resulting signal curve sres=s11a−
*s11b representing a condition of the bogie; and
a signal processing unit for comparing the resulting signal curve sres=s11a−
*s11b to at least one threshold value or threshold value profile.
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Specification