Important Achievement of Research Directorate
1. Wheel Impact Load Detector (WILD) System
WILD (Wheel Impact Load Detector), is an unmanned intelligent trackside data acquisition system that measures the dynamic impact load of wheels on the track. It is a useful ’wayside detection system’ for safety and asset reliability in train operation.
WILD system helped to reduce the railway maintenance cost significantly by identifying the damage causing wheels for quick removal. Out of round wheels produce very high impact loads which result in normally imperceptible damage. Such impact loads sustained over long term leads to premature failure of rail, wheel, bearings etc. With rising axle-loads the severity of this type of damage increases.
WILD records load of all wheels passing over the instrumented rail and these loads may be normal wheel loads or loads coming on rails due to many possible defects in rolling stocks. These defects are not necessarily always flat tyres, as is normally understood. Various possible causes for heavy loads are wheel flats, shelling marks, out of roundness of wheels, suspension problems, misalignment of bogies etc. The mechanical engineers in the field are the real experts to pinpoint the actual defects in rolling stocks and the reasons for such heavy loads, as being recorded through ‘WILD’.
Fifteen numbers of WILD Systems have now been in use on the Indian Railway, each of which relay data round the clock. Every train passing causes the system to trigger, capture/analyse and report the condition.
WILD System Architecture
A WILD Site
Objective of WILD:
- To protect Rail Infrastructure, avoid derailments & Accidents.
- To Reduce service failures and unplanned maintenance cost of Rolling stocks and Tracks.
- Wheel Impact Load Detector is used to catch the defects in the early stage and thereby Protecting Rail infrastructure, avoid derailment and accidents.
2. Development of improved oscillation monitoring system:
The OMS equipment is extensively used by zonal railways to monitor the quality of track through ride index and vertical & lateral acceleration measured on vehicle floor. Since the OMS developed earlier has become obsolete, following two types of OMS equipment’s have been developed as an alternative source to old version of OMS (OMS-2000) for assessing the track condition to decide maintenance:
a) PC based OMS
b) Micro-controller based OMS
So Far total 60 systems have been deployed over IR. Specification of PC Based OMS has recently been modified and reissued (Effective since 12th March 2012) to provide additional functionality and Compatibility with Track Monitoring System (TMS).
3. Completion of Technology Mission for Railway Safety (TMRS):
Technology Mission for Railway Safety was setup in collaboration with the Ministry of Railways (through RDSO), & Department of Science & Technology, (through IIT Kanpur) to comprehensively address safety-related issues in Indian Railways. Due to collaborative execution of these projects with premier academic and research institute like IIT Kanpur, lot of capability / capacity building has taken place in RDSO.
4. Publication of Research Report
A) Report R103 on the Measurement of X – Factor:
X Factor is a measure of the Yaw Resistance which is the resistance encountered by a bogie to move about the vertical axis relative to the vehicle body.
X-Factor measurements were successfully carried out for a BOXNHS wagon fitted with PU / MINOR side bearers, at the VCF lab of Research Directorate. The X-factor measured was in the range between 0.03 to 0.04 for PU side bearers and in the range of 0.02 to 0.03 with MINOR side bearers.
B) Report R106 on the Review of WILD Systems installed on Indian Railways:
Wheel Impact Load Detector systems were developed indigenously jointly by RDSO and IIT Kanpur in the year 2005. Over the years 15 sites were installed on the Indian Railways. A number of problems have been reported to RDSO regarding the working of WILD by the Zonal Railways. Research directorate along with Wagon Directorate has conducted detailed holistic review for the root cause of these problems and a report (Research Report R106) has been submitted to Railway Board.
C) Report R107 on the calibration and validation requirements of WILD on Indian Railways:
Study was made of the best practices for calibration and validation by benchmark WILD system on AAR and accordingly similar practices were recommended for Indian Railways. The required software changes have been implemented in all the fifteen WILD sites of Indian Railways.
D) Report R109 – a review and recommendation to use WILD as a preventive maintenance tool on Indian Railways:
This report is a follow-up review of R-106 and also presents recommendation to us WILD as a preventive maintenance tool on Indian Railways. Report has been submitted to Railway Board in October’2012.