GB2371114A - Plug type strain sensor for a railway rail - Google Patents
Plug type strain sensor for a railway rail Download PDFInfo
- Publication number
- GB2371114A GB2371114A GB0100984A GB0100984A GB2371114A GB 2371114 A GB2371114 A GB 2371114A GB 0100984 A GB0100984 A GB 0100984A GB 0100984 A GB0100984 A GB 0100984A GB 2371114 A GB2371114 A GB 2371114A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rail
- forces
- sensor
- measure
- plug sensor
- 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
Links
- 238000005452 bending Methods 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims 1
- 238000005336 cracking Methods 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/161—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance
- G01L5/1627—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance of strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
- G01M17/10—Suspensions, axles or wheels
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
This invention relates to a plug type strain gauged sensor which is embedded into a rail of a railway so as to be in the main axial load path in order to measure the compressive/tensile forces. Embedded to halfway through the rail, the electrical output from the sensor will be substantially independent of the torsional and bending forces. The change in axial force can be measured incrementally to give warning of forces which could damage the rail. These forces would normally be due to changes in ambient temperature. The sensor output can be used in open loop mode for monitoring only or in a mode involving an operative adjusting the rail axial forces to an acceptable level. Electronics associated with sensor can determine the rate of change of the electrical output/signal and can differentiate between the slow change due to ambient temperature variation and the relatively rapid change due to cracking/breaking of the rail which would threaten safety.
Description
THE MEASUREMENT OF TENSILE/COMPRESSIVE FORCES IN THE RAIL OF
RAILWAYS FOR THE PROTECTION OF THE RAIL AND THE DETECTION OF
CRACKS IN THE RAIL
This invention relates to an instrument aimed at measuring the tensile/compressive forces in the rail for the protection of the rail on railways and the detection of cracks developing in the rail.
The idea is to instrument the rail itself by use of a plug type strain gauge sensor similar or the same as that described in patent documents GB 9817770.2, GB 2305729, GB 2050624A,
GB8313834, GB 8308372 and US patent 4530245.
This can be done by using the strain sensor to measure tensile/compressive forces rather than shear force, the purpose originally conceived for the sensor, by moving the strain gauge pattern through 45'to the position chosen to measure shear force. This is easily achieved, see FIG 1.
As shown in FIG 2, the plug sensor (a) is fitted into a precisely drilled and reamed hole (c) which has a diameter such that a closely controlled interference fit is achieved between plug sensor barrel (d) and hole (c). This has the effect of providing an easily installable and sealed sensor/rail system which will be highly reliable over the extreme range of forces that the effects of varying temperature cause in the rail.
British Rail quoted an 88 Tonnes change in force for a 400C change in temperature.
The plug sensor (a) is mounted on the neutral axis of the rail, see FIG 2, so as to eliminate the effects of bending in the rail and will be of such length as to enable the internal strain gauge (b) to reach the vertical neutral axis to eliminate the effects of torsion in the rail, see FIG 3.
The plug sensor will take up and transmit the forces in the rail and convey the resultant voltage signal by electric cable (X). This signal is proportional to the tensile/compressive force that it is designed to measure.
In any event the plug sensor (a) will measure and can indicate these forces and this information can be transmitted to a control site elsewhere or can be downloaded into a computer or directly read.
If cracks begin to develop in the rail the tensile force will rapidly change. This will be unlike the force changes due to temperature which are slow and regular. The crack will show up as a sudden change in voltage level output from the sensor.
Claims (6)
1. A plug sensor similar or the same as described in patent documents GB 9817770. 2, GB2305729, GB 2050624A, GB 8313834, GB 8308372 and US patent 4530245 which is applied to measure the tensile/compressive forces in the rail of railways which vary continuously according to the ambient temperature.
2. This plug sensor can eliminate the effects of possible corrupting forces, i. e. , bending and torsion.
3. The electronic voltage signal derived from the plug sensor can be used to measure or be transmitted or be downloaded into a computer as well as just read by an observer.
4. The control of damaging tensile/compressive/axial forces can be by an operative resetting such forces to an acceptable level.
5. This plug sensor can also measure axial forces such that normal tension force is measured and an interruption or relatively sudden change in this force will indicate a crack developing in the rail.
6. This plug sensor is very robust in construction and very easy to install.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0100984A GB2371114B (en) | 2001-01-13 | 2001-01-13 | The measurement of tensile/compressive forces in the rail of railways for the protection of the rail and the detection of cracks in the rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0100984A GB2371114B (en) | 2001-01-13 | 2001-01-13 | The measurement of tensile/compressive forces in the rail of railways for the protection of the rail and the detection of cracks in the rail |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0100984D0 GB0100984D0 (en) | 2001-02-28 |
| GB2371114A true GB2371114A (en) | 2002-07-17 |
| GB2371114B GB2371114B (en) | 2005-04-06 |
Family
ID=9906820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0100984A Expired - Fee Related GB2371114B (en) | 2001-01-13 | 2001-01-13 | The measurement of tensile/compressive forces in the rail of railways for the protection of the rail and the detection of cracks in the rail |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2371114B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035288A1 (en) * | 2004-09-28 | 2006-04-06 | Politecnico Di Torino | Measuring device for loads acting on rails |
| CN104165716A (en) * | 2014-07-21 | 2014-11-26 | 华东交通大学 | Monitoring system for wheel-rail forces of railway tracks |
| GB2533903A (en) * | 2014-10-02 | 2016-07-13 | West Roger | Development of the application of a multi-parameter embedment transducer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102765023B (en) * | 2012-07-10 | 2015-04-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for polishing surface of steel rail and method for detecting residual stress of steel rail |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1518359A (en) * | 1977-02-02 | 1978-07-19 | Strainstall Ltd | Force measurement |
| GB2050624A (en) * | 1979-05-11 | 1981-01-07 | Barnett J D | Strain transducers |
| EP0127278A1 (en) * | 1983-03-26 | 1984-12-05 | TRW Transportation Electronics Limited | Strain transducers |
| EP0129331A2 (en) * | 1983-05-19 | 1984-12-27 | TRW Transportation Electronics Limited | Strain-gauged transducers |
| GB2305729A (en) * | 1995-09-26 | 1997-04-16 | Roger West Lab Limited | Improvements relating to strain transducers |
| GB2340609A (en) * | 1998-08-17 | 2000-02-23 | Roger West Lab Limited | Strain transducers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0001118D0 (en) * | 2000-01-19 | 2000-03-08 | Davison Ian T | A method for the determination of longitudinal stresses in railway rails |
-
2001
- 2001-01-13 GB GB0100984A patent/GB2371114B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1518359A (en) * | 1977-02-02 | 1978-07-19 | Strainstall Ltd | Force measurement |
| GB2050624A (en) * | 1979-05-11 | 1981-01-07 | Barnett J D | Strain transducers |
| EP0127278A1 (en) * | 1983-03-26 | 1984-12-05 | TRW Transportation Electronics Limited | Strain transducers |
| EP0129331A2 (en) * | 1983-05-19 | 1984-12-27 | TRW Transportation Electronics Limited | Strain-gauged transducers |
| GB2305729A (en) * | 1995-09-26 | 1997-04-16 | Roger West Lab Limited | Improvements relating to strain transducers |
| GB2340609A (en) * | 1998-08-17 | 2000-02-23 | Roger West Lab Limited | Strain transducers |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006035288A1 (en) * | 2004-09-28 | 2006-04-06 | Politecnico Di Torino | Measuring device for loads acting on rails |
| CN104165716A (en) * | 2014-07-21 | 2014-11-26 | 华东交通大学 | Monitoring system for wheel-rail forces of railway tracks |
| GB2533903A (en) * | 2014-10-02 | 2016-07-13 | West Roger | Development of the application of a multi-parameter embedment transducer |
| GB2533903B (en) * | 2014-10-02 | 2019-09-25 | West Roger | Further development of embedment transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2371114B (en) | 2005-04-06 |
| GB0100984D0 (en) | 2001-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20080113 |