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Determine Thermal Fatigue Requirements for PEPS Antenna Copper Wire over Vehicle Lifetime with defined Reliability Requirements.

GMTCI-Abhinav Jauhri
  • Technical Paper
  • 2019-28-2582
To be published on 2019-11-21 by SAE International in United States
Reliability states the degree to which the result of a measurement, calculation, or specification can be depended on to be accurate. And, tests according to GMW specifications represents a minimum of 15 years of vehicle life time with defined Reliability and Confidence level. In this work, actual number of thermal cycles for Thermal Fatigue tests (Thermal Shock and Power Temperature Cycle) are calculated for Copper Wire whose Coffin Manson exponent is 5. Overstressing the PEPS Antenna under thermal fatigue requirement (defined number of thermal cycles based on Reliability and Confidence requirements) will lead to broken Copper wire which will result in component’s functional failure and thus impossible to continue reliability testing. The objective of this paper is to determine thermal fatigue requirements for Antenna’s Copper wire whose Coffin Manson exponent is 5. Testing with exact number of thermal cycles will reduce the validation failures owing to broken Copper wire and thus save incurred revalidation cost. The current study is limited to only adjusting the thermal fatigue requirements (Number of Thermal Cycles) for only specific E/E…
 

Vision Based Surface Roughness Characterization of Flat Surfaces Machined with EDM.

BSA Crescent Institute of Science & Technology-Mahashar Ali, Siddhi Jailani, Mangalnath Anandan, Vignesh Pavithran
Vellore Institute of Technology-Murugan Mariappan
  • Technical Paper
  • 2019-28-0148
To be published on 2019-10-11 by SAE International in United States
Controlling and measuring the surface roughness is an important issue in quality manufacturing. Conventional method of measuring the surface roughness using stylus instrument is an intrusive and contact type hence it is not suitable for online measurement which result, there is an increasing need for a reliable, non-contact method of surface roughness measurement. Over the few years, advances in image processing techniques have provided the basis for developing image based surface roughness measuring techniques. In this investigation, a vision system and image processing tools were used to develop reliable surface roughness characterization technique for Electrical Discharge Machined surfaces. A CMOS camera fitted with zoom 6000 lens system having optical magnification up to 45X and red LED light source were used for capturing images of machined surfaces with different surface roughness values. A signal vector can be generated from image pixel intensity and can be processed using MATLAB software. From the signal vector, the mean and the standard deviations were obtained. The mean of the images signal vector correlates well with the stylus measured roughness parameters…
 
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Microturbine Propulsion for UAVs

Aerospace & Defense Technology: August 2019

  • Magazine Article
  • 19AERP08_03
Published 2019-08-01 by SAE International in United States

Seventy years ago, military aviation moved from reciprocating engines to vastly more reliable turbo jets and turboprops. Shortly after, the commercial air transport industry followed suit, enabling modern air transport. Today, virtually all large aircraft rely on turbine propulsion, yet small aircraft, both manned and unmanned, have not exploited the advantages of turbines for propulsion.

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Critical Communications Break Out of the Analog Mold

Aerospace & Defense Technology: August 2019

  • Magazine Article
  • 19AERP08_05
Published 2019-08-01 by SAE International in United States

Military and public safety communications increase digital and data capabilities without sacrificing reliability or interoperability.

Once firmly rooted in its analog origins, critical communications is now steadily evolving to provide enhanced situational awareness. The latest public safety and military communications (MilCom) radios are more versatile and reliable, supporting ad-hoc networks to improve or enable connectivity. With higher-data-rate capabilities, critical communications solutions can send and receive high-resolution images, videos, and other types of data-intensive content. At the same time, they provide higher-quality voice communications while maintaining security. To ensure communications and interoperability, they still can support analog communications as a failsafe. These myriad capabilities are possible through the ongoing adoption of new technologies, ranging from digital public safety standards and modulation formats, to technologies like wireless local area networking (WLAN) and Long Term Evolution (LTE).

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Hybrid Transformer

  • Magazine Article
  • TBMG-34733
Published 2019-07-01 by Tech Briefs Media Group in United States

Researchers have developed a hybrid transformer that has the benefit of a full planar transformer design but uses a wire-wound secondary winding to keep the parasitic winding capacitances lower. Alone, planar transformers have the advantage of a lower profile and better reproducibility, but wire-wound transformers allow for less parasitic capacitances. By combining elements from traditional wire-wound transformers and planar transformers, the overall performance and reliability were improved.

 

Ranking of Thick Ice Shapes Based on Numerical Simulation for Certification

Airbus-Marcus Barth, Johan Degrigny, James Brown, Fatih Tezok, Richard Lewis, Nathalie Alegre, Isaac Barrios-Garcia
Published 2019-06-10 by SAE International in United States
The objective of this paper is to present a numerical method to rank thick ice shapes for aircraft by comparing the ice accretion effects for different icing scenarios in order to determine the more critical ice shape. This ranking allows limiting the demonstration of the aerodynamic characteristics of the aircraft in iced condition during certification to a reduced number of ice shapes. The usage of this numerical method gives more flexibility to the determination of the critical ice shapes, as it is not dependent of the availability of physical test vehicles and/or facilities. The simulation strategy is built on the Lattice Boltzmann Method (LBM) and is validated based on a representative test case, both in terms of aircraft geometry and ice shapes. Validation against existing experimental results shows the method exhibits an adequate level of reliability for the ranking of thick ice shapes.
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Analyzing Field Environments to Understand Product Failure Causes

Vibration Research-Jade Vande Kamp
Published 2019-06-05 by SAE International in United States
Product failures often require expensive repairs or replacements. Over-engineering adds to recurring costs and its success is uncertain if the failure’s cause is not understood. Engineers need in-depth knowledge before attempting a re-design. This case study focuses on bus seat failures that occasionally occur in the field but are not predicted by current industry standard tests in the lab. The goal was to collect comprehensive field vibration data and analyze that data to understand the failure’s causes. The study used accelerometers placed at various points in multiple seating configurations and across multiple field environments. Analysis identified transmissibility issues between axes of motion, as well as a seat configuration with higher reliability.
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Improved Directed Flux Motor

  • Magazine Article
  • TBMG-34617
Published 2019-06-01 by Tech Briefs Media Group in United States

Electromagnetic motors typically convert electrical energy into rotational mechanical energy and are employed across a wide array of applications. While motors represent relatively mature technology, practitioners continue to seek ways to enhance motor operation including a decrease in cost, drop in size/weight, reduction in power consumption, increase in reliability, and enhanced degrees of freedom (i.e., the number of ways a machine can move within three-dimensional space).

 

Vulnerability of FlexRay and Countermeasures

SAE International Journal of Transportation Cybersecurity and Privacy

Panasonic Corporation, Japan-Takeshi Kishikawa, Ryo Hirano, Yoshihiro Ujiie, Tomoyuki Haga, Hideki Matsushima, Kazuya Fujimura, Jun Anzai
  • Journal Article
  • 11-02-01-0002
Published 2019-05-23 by SAE International in United States
The importance of in-vehicle network security has increased with an increase in automated and connected vehicles. Hence, many attacks and countermeasures have been proposed to secure the controller area network (CAN), which is an existent in-vehicle network protocol. At the same time, new protocols-such as FlexRay and Ethernet-which are faster and more reliable than CAN have also been proposed. European OEMs have adopted FlexRay as a control network that can perform the fundamental functions of a vehicle. However, there are few studies regarding FlexRay security. In particular, studies on attacks against FlexRay are limited to theoretical studies or simulation-based experiments. Hence, the vulnerability of FlexRay is unclear. Understanding this vulnerability is necessary for the application of countermeasures and improving the security of future vehicles. In this article, we highlight the vulnerability of FlexRay found in the experiments conducted on a real FlexRay network. Consequently, we clarify the conditions under which attackers masquerade as legitimate electronic control units (ECUs) and transmit spoofed FlexRay frames. We also confirm that a consumer vehicle’s functions such as steering, braking,…
 

First Smile, Last Smile

Autonomous Vehicle Engineering: May 2019

Lindsay Brooke
  • Magazine Article
  • 19AVEP05_09
Published 2019-05-01 by SAE International in United States

May Mobility is building a unique business model around AV shuttle services, explains COO and co-founder Alisyn Malek.

Entering the busy headquarters of May Mobility, my eyes fix almost immediately on a huge red Corvette brake caliper sitting on a tool cart beside an engineer's work station. “You guys must be planning some really fast self-driving shuttles,” I quip to COO and co-founder Alisyn Malek moments later, when she greets me for our interview.

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