SLIDE 1 Development of an Arc Damage Development of an Arc Damage Modeling Tool Modeling Tool
- William Linzey – Lectromechanical Design Company
- Michael Walz – FAA William J. Hughes Technical Center
- Cesar Gomez – FAA William J. Hughes Technical Center
- Michael Traskos – Lectromechanical Design Company
- Armin Bruning – Lectromechanical Design Company
Aging Aircraft 2007
April 17, 2007
SLIDE 2
Examples of Arcing Damage Examples of Arcing Damage
SLIDE 3
Goal of the Program Goal of the Program
Modeling tool that can represent damage incurred
from an arcing event.
Data produced from the tool can be used to
support TC and STC applications.
Supported by the FAA William J. Hughes
Technical Center
SLIDE 4 Program Outline Program Outline
- 2 year effort that began January 2007
- Effort is divided into 4 Tasks
- 1. Generation of Empirical Data
- 2. Development of Analytical Methods
- 3. Development of the Modeling Tool
- 4. Demonstration Kit and Presentation
SLIDE 5
Types of Damage to be Modeled Types of Damage to be Modeled
Target (What is arced to) Other Wires in the bundle Objects at a distance
– Ejected Metal – Hot Ionize Gas Plume
SLIDE 6
Mitigation Techniques to be Considered Mitigation Techniques to be Considered
Arc Fault Circuit Interruption (AFCI) Separation and Segregation Non Arctracking Wire Insulation
SLIDE 7
Test Parameters Test Parameters
Initiation Method Source Voltage Fault Current Arcing Duration (Circuit Protection) Wire Gauge & Insulation Type Number of Power Wires Target Material & Geometry
SLIDE 8
Initiation Methods Initiation Methods
Swing Test Vibration Guillotine Wet Arcing
SLIDE 9
Target Material & Geometry Target Material & Geometry
Hydraulic Line: Aluminum Hydraulic Line: Titanium Flight Control Cable: Steel Aircraft Structure: Aluminum Possible: Pressurized Hydraulic Line
SLIDE 10 Parts of the Model Parts of the Model
Modeling the arc
– Power – Duration of the arc
Partition of energy
– Incident on Target – Dissipated into the Source (Wires) – Ejected from Arcing Area ( Hot Gas & Ejected Material)
Damage
– Arc Energy Heating Metallic Target – Hot Gas Heating Wire Insulation
SLIDE 11
Example: Damage to Hydraulic Line Example: Damage to Hydraulic Line
Movie Movie
SLIDE 12
Example: Damage to Hydraulic Line Example: Damage to Hydraulic Line
Photo Photo
SLIDE 13 Example: Damage to Hydraulic Line Example: Damage to Hydraulic Line
Voltage and Current Waveform Voltage and Current Waveform
Arc Voltage and Current
200 150 100 50 50 100 150 200 0.01 0.012 0.014 0.016 0.018 0.02 0.022 0.024 0.026 0.028 0.03 Time (Sec) Voltage (V) 200 150 100 50 50 100 150 200 Current (A)
ARC Voltage Current
FAA Tube 2 2
SLIDE 14 Example: Damage to Hydraulic Line Example: Damage to Hydraulic Line
Power and Energy Power and Energy
Power and Energy
500 1000 1500 2000 2500 3000 3500 4000 4500 5000 0.01 0.012 0.014 0.016 0.018 0.02 0.022 0.024 0.026 0.028 0.03 Time (Sec) Power (W) 2 4 6 8 10 12 14 16 18 20 Energy (J)
Pow 2 Ener 2
FAA Tube 2 2
SLIDE 15
Example: Damage to Hydraulic Line Example: Damage to Hydraulic Line
Finite Volume Simulation Finite Volume Simulation
SLIDE 16
Example: Damage to Hydraulic Line Example: Damage to Hydraulic Line
Finite Volume Simulation Finite Volume Simulation
SLIDE 17
Example: Damage to Other Wires Example: Damage to Other Wires
Photo: Cross Photo: Cross sections sections
SLIDE 18
Example: Energy in the Hot Gas Plume Example: Energy in the Hot Gas Plume
Photo: Thermal Gradient Stratification Photo: Thermal Gradient Stratification
SLIDE 19 Example: Energy in the Ejected Material Example: Energy in the Ejected Material
Photo: Cross Photo: Cross sections sections
Volume Mass Energy to Melt Copper Energy to Raise Copper to Evap. Temp Energy of Copper Mil mm mm
3
g J J J 35 0.875 2.805 0.02513 15.40 29.62 22.51 ± 7.11 20 0.500 0.523 0.00469 2.90 5.57 4.23 ± 1.34 7 0.175 0.022 0.00020 0.123 0.237 0.180 ± 0.057 2 0.050 0.0005 4.69E06 0.0029 0.0056 0.0042 ± 0.0014 Diameter of Copper Ball
