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Directive Train Horn Demonstration System Performance

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The Train Horn Problem: ... Train horn soundings are generally required at most highway/rail grade crossings ... Proposed train mounted array horn (artist's ... – PowerPoint PPT presentation

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Title: Directive Train Horn Demonstration System Performance


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 trains 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 (artists
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
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