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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…
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Towards High Accuracy Parking Slot Detection for Automated Valet Parking System

Tongji University-Qinghua Yang, Hui Chen, Junzhe Su, Jie Li
Published 2019-11-04 by SAE International in United States
Highly accurate parking slot detection methods are crucial for Automated Valet Parking (AVP) systems, to meet their demanding safety and functional requirements. While previous efforts have mostly focused on the algorithms’ capabilities to detect different types of slots under varying conditions, i.e. the detection rate, their accuracy has received little attention at this time. This paper highlights the importance of trustworthy slot detection methods, which address both the detection rate and the detection accuracy. To achieve this goal, an accurate slot detection method and a reliable ground-truth slot measurement method have been proposed in this paper. First, based on a 2D laser range finder, datapoints of obstacle vehicles on both sides of a slot have been collected and preprocessed. Second, the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm has been improved to efficiently cluster these unevenly-distributed datapoints. After that, the Random Sample Consensus (RANSAC) algorithm has been improved to accurately fit the vehicles’ longitudinal contours. Finally, the candidate slot has been constructed and checked for its rationality. The final slot detection results have…
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Research on CAN FD Controller Conformance Test System

Tongji University-Feng Luo, Zhuo Fu
Published 2019-11-04 by SAE International in United States
The Controller Area Network with Flexible Data-Rate (CAN FD) is invented to compensate for the limited bandwidth of Controller Area Network (CAN). The technology of CAN FD bus conformance test is a prerequisite for the interconnection and normal work of different manufacturers’ CAN FD module, and is of great significance for ensuring the reliability of the CAN FD network. Firstly, the communication protocol conformance test theory is briefly analyzed and the characteristics of the CAN FD protocol are introduced in this paper. Then the test scope and test objects of CAN FD conformance test are pointed out. This paper mainly focuses on the CAN FD controller conformance test, which is belong to chip test. The controller implements the most parts of data link layer in a CAN FD module. Furthermore, the test method and the test cases are elaborated. Based on the coordinated test method, a conformance test system is designed and the hardware and software are developed for the test system. The execution of the test process requires communication and coordination between the test…
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Design and Research of Intelligent Vehicle EPB Controller Based on ISO26262 Standard

Nanjing Tech University-Min Song
Senior-Tian Le Jia
Published 2019-11-04 by SAE International in United States
In recent years, the development of intelligent vehicle and new energy vehicles has advanced by leaps and bounds, which has further improved the safety requirements of controllers. And more and more component manufacturers are actively promoting the ISO 26262 standard “Road Vehicles-Functional Safety”. At the same time, the electronic parking brake (EPB) system is an indispensable electronic product of the intelligent vehicle, which brings convenience to drivers and improves vehicle safety. So it is necessary to develop an intelligent vehicle pneumatic EPB system based on the ISO 26262 standard to improve reliability and safety. In this paper, the concept phase of the ISO 26262 standard was analyzed and applied to the design of the EPB system. The risk assessment and risk analysis of the EPB system were carried out, and the corresponding safety objectives were formulated. In this paper, a dual MCU scheme was proposed to the EPB system, which contained the core MCU and the monitoring MCU. Then the hardware circuit is designed according to the proposed safety goal, including mutual reset circuit and…
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In-Service Reliability Data of Continuously Active Ballscrew and Geared Flight Control Actuation Systems

A-6B3 Electro-Mechanical Actuation Committee
  • Aerospace Standard
  • AIR5713A
  • Current
Published 2019-10-14 by SAE International in United States

This Aerospace Information Report (AIR) has been written to provide in-service reliability data of continuously active ball screw and geared flight control actuation systems.

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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
Published 2019-10-11 by SAE International in United States
Surface roughness measurement is an important one in any manufacturing next to dimensions. 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 with red LED light source were used for capturing images of EDMed surfaces. A separate signal vector generated for all the images from its image pixel intensity matrices. The mean, skewness and kurtosis were obtained from the signal vector. The mean, skewness and kurtosis of the images signal vector correlates very well with the stylus measured hybrid roughness parameters Rda and Rdq. Hence the technique may be preferred for online surface roughness characterization of Electrical Discharge Machined (EDMed) surfaces.
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Analytical Model for Calibration Results Performances Enhancement, Resulting in Automated Prescription for Equipments

Airbus-Juan Manuel García Lasanta, Damian Mendez-Huelva
SAICA SL-Jose Enrique Garofano
Published 2019-09-16 by SAE International in United States
Most of the decisions taken every day are based on the results of measurements of all different events that occur around us. The reliability of these measurements depends basically on the environment in which they are carried out, the procedure defined and the equipment used, evaluating their different contributions through the uncertainty of measurement. In the case of the measuring equipment, the calibration process associated with adequate traceability provides part of the information necessary to contribute positively to the generation of reliability. However, the physical nature of the instruments means that all of them have a certain degree of drift in their metrological characteristics, which requires users to establish time intervals to confirm the maintenance of the goodness of measurement of such equipment. In this article, a methodological proposal for the processing of calibration data, which makes it possible to establish a systematic approach for the dynamic and flexible establishment of calibration intervals for measuring equipment in industrial environments, is introduced. Finally, the results of a practical experience with this methodology carried out in the…
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EDITORIAL: There is no substitute for ‘Automotive Grade’

Automotive Engineering: September 2019

Editor-in-Chief-Lindsay Brooke
  • Magazine Article
  • 19AUTP09_05
Published 2019-09-01 by SAE International in United States

When you get in a vehicle and push the ‘start’ button, you're betting that the machine will get you to your destination safely and reliably, regardless of the driving conditions. Lives are at stake the moment you lift off the brake pedal.

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Operational Considerations for High-Reliability Interconnects in Military and Aerospace Applications

  • Magazine Article
  • TBMG-35109
Published 2019-09-01 by Tech Briefs Media Group in United States

In the recent past, military acquisition has shifted from being locked into large long-term contracts to developing complex systems in discrete increments that can be further optimized in future design cycles. These shorter design cycles allow for equipment to be deployed more rapidly, thereby mitigating the risk of subsystems going obsolete as increasing proportions of budget dollars go towards operation and support (O&S). This transition to evolutionary acquisition (EA) leaves a major opportunity for vendors to develop commercial off-the-shelf (COTS) components that are military-compliant.

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Operational Considerations for High-Reliability Interconnects in Military and Aerospace Applications

Aerospace & Defense Technology: September 2019

  • Magazine Article
  • 19AERP09_02
Published 2019-09-01 by SAE International in United States

In the recent past, military acquisition has shifted from being locked into large long-term contracts to developing complex systems in discrete increments that can be further optimized in future design cycles. These shorter design cycles allow for equipment to be deployed more rapidly, thereby mitigating the risk of subsystems going obsolete as increasing proportions of budget dollars go towards operation and support (O&S). This transition to evolutionary acquisition (EA) leaves a major opportunity for vendors to develop commercial off-the-shelf (COTS) components that are military-compliant.

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