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Ritherdon AFB20(2) presentation 21-9-17


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Presentation by Ben Ritherdon to the European Union Road Federation on how Ritherdon worked with Manchester University to develop the first passively-safe, roadside cabinet.

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  • Here's the presentation I gave to the ERF in Brussels last month on how it's possible to carry out rigorous, technical and innovative product development efficiently. For example by in-house prototyping and testing where you can, and tapping in to university expertise to fill in the gaps (FEA modelling in this case).
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Ritherdon AFB20(2) presentation 21-9-17

  1. 1. Brussels, Belgium Thursday September 21, 2017
  2. 2. Dr Ben Ritherdon Managing Director - Ritherdon & Co Ltd Prof Yong Wang School of MACE, University of Manchester AFB 20 (2), Belgium, 21st Sept 2017
  3. 3. Ritherdon Location  Darwen, 1 hour north of Manchester. What we do – “Clever Metalwork”  Electrical enclosures, fire stopping products, electricity supply enclosures for the roads, housing, electricity industries etc.  Close relationship with School of MACE at Manchester (knowledge transfer).
  4. 4. Customer requirement to avoid barriers around their installations. Passively safe columns available but no cabinet.
  5. 5. Cabinet design – RB800 • Based on the Ritherdon RB800 electrical enclosure. • 1200 x 800 x 380 (hwd). • Extra weight added to represent a populated cabinet in use.
  6. 6. Cabinet design – RB800 • Spacer unit between the cabinet:plinth interface. • Fixed by shear bolts. • Consistent plane for predictable shearing. • Shear bolts strong enough for wind load, weak enough for impact. Patent application no. GB1300693.7
  7. 7. Criteria to confirm passively safe (EN12767: 2007) Required Impact angle (o) 20 (+/-2) Impact speed (kph) 35 (+/-3) 100 (+/-5) THIV (km/h) ≤27 ASI ≤1 Cabinet behaviour. As predicted. Detached elements and penetration. No penetration of the compartment. Vehicle behaviour. Remains upright with <45o roll and pitch.
  8. 8. Taking the risk out of testing 1. 1st crash test – tractor and driver. 2. 2nd crash test – scrap car and driver. 3. EN12767: 2007 Impact test at TRL, Berkshire, UK. • A modelling stage before Stages 1 and 2?
  9. 9. FEA Modelling at Manchester University Simplified model of a car Mass + Spring of stiffness = k Behaviour and design of steel columns subjected to vehicle impact. PhD Thesis. 2012. H. A. B Al-Thairy. Manchester University. Objective Test a range of parameters to give confidence that the planned impact tests would be safe and successful. • 0.5k to 2k • Three grades of shear bolts steel • Total mass of cabinet 25 to 150 kg
  10. 10. FEA model parameters Model Cabinet dimensions (hwd) 500x640x360 Cabinet mass kg 25 to 150 Extra mass added kg 125 Shear bolt grade High, medium, low Vehicle mass kg 1042 (Suzuki Swift) Vehicle speed kph 100 Vehicle stiffness 0.5k to 2k Impact angle 20 o
  11. 11. Model output Mass No additional mass (25 kg total) Additional mass (150 kg total) Stiffness 0.5k 1k 2k 0.5k 1k 2k High grade Med grade Low grade ASI 0.55 0.61 0.88 1.0 1.1 1.3 1.2 1.0
  12. 12. • ASI borderline for 150 kg – even with low grade shear bolts. • Use low grade shear bolts. • Reduce the total weight for impact testing to 50 + 30 kg. • ASI ought to be well below the limit for the 100 kph impact test. Conclusions from modelling
  13. 13. Tractor test okay (tractor crash test video) Car test okay (car crash test video)
  14. 14. EN12767 Impact test parameters Model EN12767 test Cabinet dimensions (hwd) 500x640x360 1200x800x380 Cabinet mass kg 25 to 150 50 Extra mass added kg 125 30 Shear bolt grade High, Med, Low Low Vehicle mass kg 1042 (Suzuki Swift) 865 (Nissan Micra) Vehicle speed kph 100 30 and 100 Vehicle (model) stiffness 0.5k to 2k n/a Impact angle 20 o 20 o
  15. 15. EN12767 test results TRL high speed crash test from above.
  16. 16. EN12767 test results Required High speed test Low speed test Impact speed (kph) 35 (+/-3) and 100 (+/-5) 100 (+/-5) 35 (+/-3) THIV (km/h) ≤27 10 (CFC 180) 8 (13Hz) 7 (CFC 180) 7 (13Hz) ASI ≤1 0.5 (CFC 180) 0.4 (13Hz) 0.2 (CFC 180) 0.1 (13Hz) Cabinet behaviour. As predicted.   Detached elements and penetration. No penetration of the compartment.   Vehicle behaviour. Remains upright with <45o roll and pitch.  
  17. 17. Any questions?