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An Experimental Investigation of Axial Cutting Under a Tension Deformation Mode

University of Windsor-Anthony Gudisey, William Altenhof, John Magliaro
  • Technical Paper
  • 2020-01-0206
To be published on 2020-04-14 by SAE International in United States
The most common use of tension energy absorption is found in personal fall arrest systems, however, there exist a plethora of possible applications in the automotive field for both vehicular and roadside safety hardware. During a fall, cables attached to a safety harness must not exceed a maximum arresting force over an arresting extension. The main disadvantage of the current state of the art for fall arrest is that energy dissipation is a result of tearing and failure of fabric materials which causes erratic and fluctuating loads. Axial cutting; a novel energy dissipation mechanism developed by researchers at the University of Windsor, has been shown to minimize load fluctuations while maintaining a stable load. Its capabilities have been explored in compression, but no studies have been conducted in tension. A set of test specimens were chosen for this purpose based on predictions from analytical models. These specimens were circular extrusions made from AA6061 in both T4 and T6 temper conditions. They varied in diameter from 50.8 to 63.5mm, and varied in thickness from 1.25, 1.59…
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Simulation of Conductive and Radiated Emission for Off and On-Board Radio Receivers According to CISPR 12 and 25.

Altair Engineering-Aseim Elfrgani, C. J. Reddy
Altair ProductDesign, Inc-Dipen Das
  • Technical Paper
  • 2020-01-1371
To be published on 2020-04-14 by SAE International in United States
Two of the most commonly exercised standards by Electromagnetic compatibility (EMC) automotive engineers are CISPR 12 and CISPR 25. Both are developed and established by EMC regulatory committee named as CISPR (International Special Committee on Radio Interference) which is a part of International Electrotechnical Commission (IEC). While CISPR 12 is imposed as a regulation to ensure uninterrupted communication for off-board radio receivers, CISPR 25 is often applied to ensure the quality of services of on-board receivers. Performing these tests becomes challenging until the vehicle is prototyped which may prolong the production time in case of failure or need for modification. However, conducting these tests in simulation environment can offer more time and cost-efficient way of analyzing the electromagnetic environment of automotive vehicles. In this paper, a computational approach is proposed in order to predict electromagnetic disturbance from on-board electronics/electrical systems using 3D computational electromagnetic (CEM) tool; Altair Feko. The presented study elaborates on radiated and conductive emission simulations performed for both vehicular and component/module level EMI testing according to CISPR 12 and 25. Simulation setup…
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An experimental study on the failure behavior of high voltage cables (HVCs) under mechanical loading

Changan Automobile Co. Ltd.-Huili Yu, Fangyuan Shi
Tsinghua University-Yuanjie Liu, Yong Xia
  • Technical Paper
  • 2020-01-0199
To be published on 2020-04-14 by SAE International in United States
Electrical vehicles have shown a promising future, but the crash safety of high voltage cables (HVCs) used in electrical vehicles has not been given enough attention. This paper presents an experimental study on the failure behaviors of HVCs under different mechanical loadings. Compression tests with three different shapes of indentation head and two loading velocities were conducted. Short circuit between the indentation head and the conductor inside HVCs was monitored. It was found that HVCs exhibited different failure tolerances and failure evolutions when indentation head was different. Indentation head with sharp edges could prematurely induce short circuit severely. Strain rate had a positive effect on the force response. But the influence of strain rate on the failure behavior of HVCs depended on the shape of indentation head.
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The Behaviour of Motorcycle Instrument Clusters during a Collision

Collision Science-Christopher H. Goddard
  • Technical Paper
  • 2020-01-0879
To be published on 2020-04-14 by SAE International in United States
The behaviour of the instrument cluster of passenger cars during a collision is reasonably well understood, following a number of studies over the past decade. However one of the frequent questions asked is if motorcycle instruments can be considered in the same way as passenger cars. Motorcycle instruments work in the same way as passenger car instruments. The older models use a Bowden cable to drive a spinning magnetic cup, which drags an instrument needle against a hair spring. Newer models (typically post 2000) use a stepper motor which requires power to drive the needle to any indicated position, including returning it to zero. Hence if power to the instrument is lost as a result of a collision, there is no electrical power to the motor to move the needle, and it should be left at its last position before the power was lost. However, the accelerations experienced by a motorcycle instrument during a collision are significantly different from those of an instrument cluster housed within the dash of a passenger car. Over the past…
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Cable Impedance Calculations Employed in Designing Aerospace Electrical Power Systems

Astronics AES-Jon Fifield
  • Technical Paper
  • 2020-01-0037
To be published on 2020-03-10 by SAE International in United States
This paper presents design considerations in utilizing cable impedance calculations in the design of an aerospace electrical power system (EPS). Past wiring design guidelines featured a tabular set of data based on a single-point design reference. This results in a cable selection which adds unnecessary weight and under-utilized the wire’s performance ability when considering a vehicle’s design requirements. Present wiring design guidelines have lagged behind the growing movement to achieve an optimized wire selection. Understanding the shortfalls with past and present wiring design methods will improve future methods to comply with increasingly restrictive vehicle performance requirements. This paper will discuss two of the most important design requirements for future aerospace electrical power and distribution feeders, which are weight and thermal limits assigned to an EPS design.
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A New Network Design for the “Internet from Space”

Aerospace & Defense Technology: February 2020

  • Magazine Article
  • 20AERP02_06
Published 2020-02-01 by SAE International in United States

Satellites do not yet play a major role in the world's Internet infrastructure; however, this may soon change. Within the next decade, a new generation of satellites could lay the foundations for an “Internet from space,” according to Ankit Singla, a professor at ETH Zurich's Network Design & Architecture Lab. His team is investigating how to improve the performance of large-scale computer networks including the Internet.

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Underwater Telecom Cables Used as Seismic Network

  • Magazine Article
  • TBMG-35981
Published 2020-02-01 by Tech Briefs Media Group in United States

Researchers have turned 20 kilometers of undersea fiber-optic cable into the equivalent of 10,000 seismic stations along the ocean floor. A 3.5 magnitude quake and seismic scattering from underwater fault zones were recorded. The technique, which had previously been tested with fiber-optic cables on land, could provide much-needed data on quakes that occur under the sea, where few seismic stations exist, leaving 70% of Earth's surface without earthquake detectors.

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Design and Handling Guide Radio Frequency Absorptive Type Wire and Cables (Filter Line, AS85485)

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • AIR4465A
  • Current
Published 2020-01-31 by SAE International in United States

This document presents design and application information which will allow optimized utilization of filter line wire and cable purchased to AS85485. Filter line wire is defined and design information is presented. The electrical and mechanical performance characteristics of the wire, along with recommended harnessing methods and techniques, are also presented.

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Splicer, Fusion, Fiber Optic, Aerospace, Explosion-Proof (Type I)

AS-3 Fiber Optics and Applied Photonics Committee
  • Aerospace Standard
  • AS6479/1
  • Current
Published 2020-01-30 by SAE International in United States
This detail specification defines fiber optic fusion splicers acceptable for the installation and repair of a wide range of optical fibers and cables with virtually no insertion loss in hazardous environments (potentially flammable or explosive atmospheres, Type I), particularly aerospace applications. The requirements for acquiring the splicer described herein shall consist of this specification and the latest issue of AS6479.
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Upper Frequency Measurement Boundary for Evaluation of Shielding Effectiveness in Cylindrical Systems

AE-4 Electromagnetic Compatibility (EMC) Committee
  • Aerospace Standard
  • AIR1700A
  • Current
Published 2020-01-30 by SAE International in United States
This AIR points out that above a frequency called the “transition frequency,” variances associated with the shielding effectiveness measurements can become large. It includes the derivations to demonstrate this. This fact should be taken into account when designing shielding for use above the transition frequency.
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