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Thermal Challenges in Automotive Exhaust System through Heat Shield Insulation

Sharda Motor industries limited ( R&D )-Rajadurai S
  • Technical Paper
  • 2019-28-2539
To be published on 2019-11-21 by SAE International in United States
While advanced automotive system assemblies contribute greater value to automotive safety, reliability, emission/noise performance and comfort, they are also generating higher temperatures that can reduce the functionality and reliability of thesystem over time. Thermal management and insulation are extremely important and highly demanding in BSVI, RDE and Non-IC engine operating vehicles. Passenger vehicle and Commercial vehicle exhaust systems are facing multiple challenges such as packaging constraints, weight reduction andthermalmanagement requirements.Frugal engineering is mandatory to develop heat shield in the exhaust system with minimum heat loss. The focus of the paper is to design, develop and validate heat shield products with different variables such as design gap, insulation material, sheet metal thickness and manufacturing processes. 1D and 3D computational simulations are performed with different gaps from 3 mm to 14 mm are considered. Heat protection of about 75% is achieved ( from 614°C to 140°C) using different insulation materials. Sheet metal thicknesses from 0.15 mm to 1 mm with different manufacturing processes are used in the wrap around, closed and open type protections. Computational simulation and…
 
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Thermal Conductivities of Some Polymers and Composites

Aerospace & Defense Technology: August 2019

  • Magazine Article
  • 19AERP08_09
Published 2019-08-01 by SAE International in United States

Assessing the performance of polymers used in structural armor and filament winding applications.

Thermoset polymers are good electrical insulators that are used in applications ranging from electronics to composite armor. They are rather poor thermal conductors, however.

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Wire, Electrical, Crosslinked Polyalkene, Crosslinked Alkane-Imide Polymer, or Polyarlyene Insulated, Copper or Copper Alloy

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS81044B
  • Current
Published 2019-07-08 by SAE International in United States
AS81044 covers single conductor electric wires made as specified in the applicable detail specification with tin-coated, silver-coated, or nickel-coated copper or copper alloy conductors insulated with crosslinked polyalkene, crosslinked alkane-imide polymer, or polyarylene. The crosslinked polyalkene, crosslinked alkane-imide polymer, or polyarylene may be used alone or in combination with other insulation materials as specified in the detail specification.
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TERMINAL BOARD ASSEMBLY, MOLDED-IN-STUD, ELECTRIC

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS27212D
  • Current
Published 2019-06-25 by SAE International in United States
No Abstract Available.
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Polyamide Type 6-6, Plastic Moldings and Extrusions

AMS P Polymeric Materials Committee
  • Aerospace Material Specification
  • AMS3617F
  • Current
Published 2019-06-13 by SAE International in United States
This specification covers one type of Polyamide Type 6-6 (nylon) thermoplastic resin in the form of moldings and extrusions.
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TERMINATION, SOLDER STYLE, INSULATED, HEAT-SHRINKABLE, ENVIRONMENT RESISTANT WITH MULTIPLE OPENING SEALANT, 150 °C AND 200 °C

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS83519/4
  • Current
Published 2019-06-13 by SAE International in United States
No Abstract Available.
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Etching of Fluoropolymer Insulations

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP6167
  • Current
Published 2019-06-11 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) describes the etching of fluoropolymer electrical wire insulations to ensure that all facets of the process from the chemistry to the processing, to the storage and handling are well defined.
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Guidelines for Harness Critical Clamp Locator Marker Installation on Electrical Cable Assemblies

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP5614
  • Current
Published 2019-06-11 by SAE International in United States
This ARP specifies the recommended methods of marking electrical wiring and harnesses to aid in the positioning/routing of electrical wiring, harnesses and cable assemblies.
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Cable, Power, Electrical, Portable General Specification For

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS5756B
  • Current
Published 2019-06-07 by SAE International in United States
This specification covers 600 V heavy duty, portable, power, single and multiconductor, electrical cable for severe flexing service (see detail specifications for voltage limitations). The AS5756 insulation system has been used in aerospace ground power applications using 115/200 V (phase to neutral) at 400 Hz AC. Verification of the suitability of this product for use in other electrical system configurations (600 V, etc.) is the responsibility of the user.
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Fast Broadband Curved Insertion Loss Simulation of an Inner Dash Insulator Using a Cylindrical Transfer Matrix Method Spectral Approach

Interac-Gerard Borello
Treves-Arnaud Duval, Mickael Goret
Published 2019-06-05 by SAE International in United States
Middle and high frequency vibro-acoustic simulation of complex shape insulators requires using 3D poroelastic finite elements. This can be applied to either the whole part (up to 2500 Hz maximum) or through singly curved pre-computed Insertion Losses (up to 5000 Hz maximum) to be introduced in large SEA or energy-based models. Indeed, a dependence of the Insertion Loss slopes of noise treatments following the curvature is observed both experimentally and numerically. Beyond frequency range limitations, poroelastic finite element simulations following all curvatures and thickness 3D maps typically take too much time of up to a few hours each. A cylindrical Transfer Matrix Method spectral approach significantly reduces the time for the calculation of singly curved Insertion Losses up to 10 kHz to only a few minutes. This simplifies enormously the SEA modeling effort enabling easier, more precise fully trimmed vehicle middle and high frequency vibro-acoustic simulations. A dash insulator Insertion Loss numerical validation case will be presented comparing the different methods.
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