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Directive Train Horn Demonstration System Performance

Directive Train Horn Demonstration System Performance. Paul Burgé, INCE BD.CERT, URS Corporation Parke Rhoads, Acentech Incorporated. The Train Horn Problem : Train horn noise is typically the loudest and most annoying component of train noise in areas near grade crossings

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Directive Train Horn Demonstration System Performance

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  1. Directive Train Horn Demonstration System Performance Paul Burgé, INCE BD.CERT, URS Corporation Parke Rhoads, Acentech Incorporated

  2. The Train Horn Problem: • Train horn noise is typically the loudest and most annoying component of train noise in areas near grade crossings • Train horn soundings are generally required at most highway/rail grade crossings • Most train horns are generally omni directional, casting acoustical energy in all directions without regard to where the signal is needed or unwanted.

  3. Train Horn Directionality Source: Raposa and Fleming, IWRN 2001

  4. Train Horn Noise Solutions: • More grade separations • Quad gate crossings • Median barriers • One way streets • Wayside horns • Directional train horns

  5. Directional Train Horn Concept: Source: Coate, Kern and Africk, IWRN 2001

  6. Directional Train Horn Benefits: • Fleet horn upgrades would provide noise reduction benefit at all grade crossings where horns are currently sounded • No ambiguity or habituation (relative to wayside horn) • Would work for virtually all grade crossing configurations • Retains traditional train horn warning signal information with regard to train’s relative proximity and direction • Could be implemented in a cost efficient manner • Looks “cool”

  7. Acoustic Line Array: Summation(constructive interference) Cancellation(destructive interference)

  8. Direction Train Horn Demonstration Opportunity: Contractors URS and Acentech were asked by The Los Angeles County Metropolitan Transit Authority (MTA) to develop a unit to demonstrate whether a directive horn could successfully reduce crossing noise levels noise levels on recently opened MTA Gold Line light rail transit line under an existing contract Typical MTA Gold Line grade crossing

  9. Demonstration System Project Approach • Evaluate existing warning system • Design system for improved directivity • Static laboratory tests and refinement • Limited static and dynamic field test and refinement (road vehicle) • Full static and dynamic field test and evaluation (rail vehicle)

  10. MTA Gold Line LRT Vehicle

  11. Proposed train mounted array horn (artist’s conception)

  12. Directional array demo system and block diagram

  13. Truck mounted horn array

  14. Directivity Test setup

  15. Measured Warning System Directivity

  16. Dynamic pass-by test setup

  17. Dynamic pass-by test setup

  18. Community Noise Analysis

  19. Future Design Refinements • Varying Number or Directivity of Array Elements • Curved Array Geometry • Non-uniform Array Element Spacing • Electronic Delay and Phasing • Higher-order Gradient Array Configuration

  20. Optimal Warning System Directivity

  21. Questions or Comments

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