Method and device for detecting wheels with deformed treads in railroad vehicles
First Claim
1. Method of detecting deformed wheels in railroad vehicles moving along a track section where at least two wave motion sensors (3,4;
- 12-15) are positioned at the track while being in mechanical rail contact, the signals from the wave motion sensors being fed to an analytic circuit whereby an output signal with relatively low frequency is received from two of the wave motion sensors (3,4;
12,13) spaced apart a predetermined distance L1, and an output signal with relatively high frequency is received from at least one of the wave motion sensors (3,4;
14,15), characterized in that a time lag is indicated between substantially uniform signals received from the wave motion sensors (3,4;
12,13) emitting an output signal with relatively low frequency, the vehicle speed being determined with the guidance of the distance L1 and the preset time lag;
that the points of time for wheel passage are indicated in each one of the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency whereby this timing, unless the wave motion sensor for relatively low frequency and the wave motion sensor for relatively high frequency are one and the same or are situated directly at the same position, is performed with the guidance of vehicle speed and the distance along the rail to one of the wave motion sensors (3,4;
12,13) emitting an output signal with relatively low frequency;
that the curvatures of the signal from each one of the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency are individually analyzed and digitally processed;
that the processed output signals from the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency are individually compared with several signal levels permanently stored in a digital memory (MR1;
MR2), said levels being obtained from reference measurements on wheels having known characteristics such as wheels without deformations and with different types of deformation, and e.g. on recordings of railroad vehicles travelling at various speeds; and
that the presence of wheel deformation is analyzed with the guidance of this comparison.
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Accused Products
Abstract
A device for detecting deformed wheels in a railroad vehicle moving along a track. At least two wave motion sensors are positioned along said track. The wave motions in the rails created by the axial pressure of the vehicle are filtered out from two wave motion sensors spaced apart at a distance along the rails, and the vehicle speed is determined as well as the timing for each vehicle axle passage over at least one of the sensors. The frequency fractions of the vibration signal resulting from possible wheel deformations are filtered out from one or two of the sensors. An analyzer unit analyzes the type of wheel deformation while determining which one of the vehicle wheels is defective. A signal is fed to an alarm circuit upon indication from the analyzer unit that the signal or signals from the high frequency filtering deviate(s) from predetermined, acceptable formations.
20 Citations
10 Claims
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1. Method of detecting deformed wheels in railroad vehicles moving along a track section where at least two wave motion sensors (3,4;
- 12-15) are positioned at the track while being in mechanical rail contact, the signals from the wave motion sensors being fed to an analytic circuit whereby an output signal with relatively low frequency is received from two of the wave motion sensors (3,4;
12,13) spaced apart a predetermined distance L1, and an output signal with relatively high frequency is received from at least one of the wave motion sensors (3,4;
14,15), characterized in that a time lag is indicated between substantially uniform signals received from the wave motion sensors (3,4;
12,13) emitting an output signal with relatively low frequency, the vehicle speed being determined with the guidance of the distance L1 and the preset time lag;
that the points of time for wheel passage are indicated in each one of the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency whereby this timing, unless the wave motion sensor for relatively low frequency and the wave motion sensor for relatively high frequency are one and the same or are situated directly at the same position, is performed with the guidance of vehicle speed and the distance along the rail to one of the wave motion sensors (3,4;
12,13) emitting an output signal with relatively low frequency;
that the curvatures of the signal from each one of the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency are individually analyzed and digitally processed;
that the processed output signals from the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency are individually compared with several signal levels permanently stored in a digital memory (MR1;
MR2), said levels being obtained from reference measurements on wheels having known characteristics such as wheels without deformations and with different types of deformation, and e.g. on recordings of railroad vehicles travelling at various speeds; and
that the presence of wheel deformation is analyzed with the guidance of this comparison. - View Dependent Claims (2, 3, 4)
- 12-15) are positioned at the track while being in mechanical rail contact, the signals from the wave motion sensors being fed to an analytic circuit whereby an output signal with relatively low frequency is received from two of the wave motion sensors (3,4;
-
5. Device for detecting deformed wheels in railroad vehicles moving along a track provided with at least two wave motion sensors (3,4;
- 12-15) being located at the track while being in mechanical rail contact where the signals are fed to an analytic circuit (6;
16), an output signal with relatively low frequency being arranged to be obtained from two of the wave motion sensors (3,4;
12,13) which are spaced apart a predetermined distance L1, and an output signal with relatively high frequency being arranged to be obtained from at least one of the wave motion sensors (3,4;
14,15), characterized in that the analytic circuit (6;
16) determines the time lag between substantially uniform signals obtained from the wave motion sensors (3,4;
12,13) emitting an output signal with relatively low frequency and determines the vehicle speed with the guidance of the distance L1 and the preset time lag;
that the analytic circuit determines the timing of wheel passage in each one of the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency;
that the curvatures of the signal from each one of the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency are arranged to be individually analyzed and digitally processed by the analytic circuit;
that the analytic circuit compares separately the processed signals from the wave motion sensors (3,4;
14,15) emitting an output signal with relatively high frequency with several signal levels stored in a digital memory (MR1;
MR2), said levels being obtained on reference measurements of wheels having known characteristics such as wheels without deformation and with various types of deformation, and e.g. on recordings of railroad vehicles travelling at different speeds; and
that the analytic circuit analyzes wheel deformation with the aid of said comparison. - View Dependent Claims (6, 7, 8, 9, 10)
- 12-15) being located at the track while being in mechanical rail contact where the signals are fed to an analytic circuit (6;
Specification