T1107 Trial of Sander Configurations and Sand Laying Rates Update

Transcription

1 T1107 Trial of Sander Configurations and Sand Laying Rates Update Presented by Liam Purcell (Ricardo Rail) & Andrew Lightoller (DB-ESG) 4 December 2017

2 Contents Sand on the Railway Project Objectives The test train and modifications The test site and preparation Challenges we have faced and how we overcame them Example Test Data Current Situation 2

3 Sand on the Railway Sand used in low adhesion conditions to improve traction & braking Dispensed from the train, directed into the wheel/rail interface 3

4 Sand on the Railway Original standard: GMRT2461 Issue 1 (August 2001) discharge sand during full service and emergency brake applications when the presence of low adhesion is automatically detected sand shall be delivered by the leading vehicle only. forward of the third axle sand deposition rate such that the rear two axles do not come to rest on sand laid at rate of 7.5 grams/metre or greater A recognised method laying rate not exceeding 2kg/minute 10mph cut-off Current standard: GMRT2461 Issue 2 (June 2016) there are a minimum of six wheelsets between active sanders sand is discharged during service brake demand of 6%g and higher (equivalent to step 2 on typical disc braked multiple units 4

5 T1107 Project Objectives & Inputs The project objective is Determine the benefits of variablerate and distributed sanding, that could be achieved under low adhesion conditions, and Encourage the GB rail industry to move towards variable rate and distributed sanding as a mitigation for low adhesion railhead conditions 5

6 Collaborative Project RSSB (programme management) Great Western Railway & Porterbook (loan of class 387) Network Rail (RIDC test track) Freightliner (train driving & maintenance) Ricardo Rail (technical activities & management, consortium lead) DB-ESG (braking & adhesion expertise) Serco Rail Technical Services (instrumentation) Knorr Bremse (sander hardware) Bridgeway (safety staff) 6

7 Train Modifications: Sanding Equipment (1) Sanders at axles 3, 7, 11 & 19 = Existing Sander (modified) = New Sander =Unused sander (wrong direction) Direction of travel Existing sandboxes retained and two new sand boxes added at axles 7 & 11 All existing (single rate) sand valves replaced with variable rate sand valves 7

8 Train Modifications: Sanding Equipment (2) Sand hose / nozzle - validate T797 recomendations Existing OEM arrangement shown left, T797 arrangement shown right OEM Set-up 25mm Hose No Nozzle T797 Set-up 19mm hose Low & shallow Smooth nozzle 8

9 Train Modifications: Sander Control System 9

10 Train Modifications: Instrumentation Axle speeds (all 32 axles) Brake cylinder pressures (all 32 axles) Brake demand (train wires) Train speed (add doppler radar) Longitudinal acceleration (add accelerometer) Sander pressure measurement Video of axle 3 sand discharge 10

11 Train Modifications: Low adhesion spray equipment Spray equipment fitted to leading end (axle 1) Water or detergent Nozzle or 6mm open pipe 11

12 Test Site Acceleration Zone (2km) RIDC: Widmerpool to Old Dalby 7km site available Low Adhesion Zone (1km) Run-Off Zone (4km) 12 Map source:

13 Laying Paper Tape Paper tape used as contaminant to simulate leaf film Bespoke Trolley; 96km of tape 13

14 Paper Tape New vs Conditioned vs Used x New Tape Conditioned Tape Tape after Sander Testing 14

15 Challenges (1) Achieving Consistent Low Adhesion Condition Aim: sander is the only variable in the experiment; isolate others Environmental conditions proved to be the biggest variable Standardised tape conditioning process & developed analysis methodology 15

16 Challenges (2) Blocking Sanders Six instances of blocked sander valves (particles) Unable to identify cause of contamination Introduced a sieve 16

17 Challenges (3) Paper Tape Scraping Video shows easy day (morning dew) MUCH harder when dry! 17

18 Sample Very Low Adhesion Result (no sand) 1.9%g brake event video 18

19 Brake Marker Test Run Data - Axle 1 Plot (Test 191 Axles 3 & 7 Sanded at 2kg/min) Radar Train Speed Axle Speed Full Service Pressure Brake Cylinder Pressure Brake Force Average BCP 19

20 Our Current Position Completed 225 Tests over 25 site days 147 Sanded and 78 Unsanded Stopping Distances range from 342m to >3400m (calculated) Tests include: 2kg/min Fixed rate Sanding 8-Car & 4-car Sanded Axles 3, 3+7, 3+11, 3+19, and Variable Rate Sanding (4kg/min reducing to 0.6kg/min from 20mph) 4-Car Sanded Axles 3, 3+7 and

21 Moving Forward Data processing is underway but the results are not yet available Anticipated release of results early 2018 Industry events January / February 2018 VT SIC Annual Seminar September 2018? Search for project T1107 on 21

22 A Happy Test Team 22

23 Thank you