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Parametric Modelling & High-Fidelity Algorithms for Vehicle Weight Estimation for Optimized Concept Vehicle Architecture

Mahindra & Mahindra, Ltd.-Rathish Chandar Kanthallu, Nagaraju Kata, Samir Rawte, Lakshmanprasad Murugesan, Jeyevijeyan Ramakrishnan Sheerkazhi, Yuvaraj Duraiswamy
Published 2019-10-11 by SAE International in United States
The concept definition phase of typical vehicle development focuses on the architecture definition and optimization based on different constraints/requirements. With the focus on Sustainability, the architecture optimization process must include “Light-weighting” as an optimization criterion. With only concept vehicle architecture available, the vehicle weight estimation becomes judgmental & inaccurate. This paper aims to address this deficiency with a new analytical approach for vehicle weight estimation. The new approach for vehicle weight estimation is a “bottom-up” approach using parametric models for each system weight with the inputs being the relevant vehicle specifications driving the system engineering. For size/shape-driven (rather than functional) systems, the models are content-based & segment-based. The parametric models are then iterated for multiple architecture concepts & specifications and the optimum concept (meeting all functional & business constraints) is chosen. The parametric models are based on extensive benchmarking studies and regression analyses. Both single-parameter & multiple-parameter regressions are used for parametric modelling. The parameters selection is carried out such that the relationships have sound technical logic and ensuring the (curve) fits always have regression…
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SAE Aerospace Applied Thermodynamics Manual Aerothermodynamic Systems Engineering and Design

AC-9 Aircraft Environmental Systems Committee
  • Aerospace Standard
  • AIR1168/3A
  • Current
Published 2019-09-24 by SAE International in United States

This document is one of 14 Aerospace Information Reports (AIR) of the Third Edition of the SAE Aerospace Applied Thermodynamics Manual. The manual provides a reference source for thermodynamics, aerodynamics, fluid dynamics, heat transfer, and properties of materials for the aerospace industry. Procedures and equations commonly used for aerospace applications of these technologies are included.

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Fundamental Concepts of Turbocharging Modern Engines Current Practices and Trends Web Seminar RePlay

  • Webinar Recordings
  • PD331858
Published 2019-09-19
Turbocharging is an integral part of many internal combustion engine systems. While it has long been a key to diesel engine performance, turbocharging is increasingly seen as an enabler in meeting many of the efficiency and performance requirements of modern automotive gasoline engines. This replay discusses the basic concepts of turbocharging and air flow management of four-stroke engines. It explores the fundamentals of turbocharging, system design features, performance measures, and matching and selection criteria. Topics include spark ignition and diesel engine systems, the impact of different applications. The course also covers the interaction between turbocharging and engine systems and the impact on performance, fuel economy, and emissions. Developments in turbocharging technology are also covered.By participating in this course, you will be able to: Identify the basics of how a turbocharger works, how to measure the appropriateness of a turbocharger, and how to select and match a turbocharger to the needs of your powertrainEstimate the impact of turbocharging on performance and emissionsRecognize potential issues such as packaging, noise, driveability, reliability, and durabilityList the latest developments in…
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Step & Repeat: Reduce Derivative Aircraft Development Risk with Design Reuse

Mentor-Muhammad Askar
Published 2019-09-16 by SAE International in United States
The complex and risky process of designing derivative aircraft, especially when it comes to electrical systems, can be a daunting task at best. There are a number of design strategies that can be employed to mitigate risk and increase the overall efficiency. Quite simply, the current methods of manual processes, design and integration approaches that were optimized from mechanical approaches, are no match for today’s complexities.One method gaining significant traction is to employ a central database serving global interface definitions for the entire design process. Automation through generative design minimizes manual intervention and repetitive work. Furthermore, detecting changes through design rule checks allows system engineers to verify their designs, capturing both inadvertent and planned changes. The ability to instantly update the design content from the new definition streamlines the change management process.Employing these technologies in a digital, connected thread, ensures that intelligent information is leveraged at every step along the way from aircraft conception, realization, and finally to utilization - thereby minimizing risk and maximizing efficiency.
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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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Communication Transceivers Qualification Requirements - LIN

Vehicle Architecture For Data Communications Standards
  • Ground Vehicle Standard
  • J2962/1_201907
  • Current
Published 2019-07-18 by SAE International in United States

This document covers the requirements for transceiver qualification. Requirements stated in this document will provide a minimum standard level of performance for the LIN transceiver block in the IC to which all compatible transceivers shall be designed. No other features in the IC are tested or qualified as part of this recommended practice. This will assure robust serial data communication among all connected devices regardless of supplier.

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Communication Transceivers Qualification Requirements - CAN

Vehicle Architecture For Data Communications Standards
  • Ground Vehicle Standard
  • J2962/2_201907
  • Current
Published 2019-07-18 by SAE International in United States

This document covers the requirements for transceiver qualification. Requirements stated in this document will provide a minimum standard level of performance for the CAN transceiver in the IC to which all compatible transceivers shall be designed. No other features in the IC are tested or qualified as part of this recommended practice. This will assure robust serial data communication among all connected devices, regardless of supplier.

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Dedicated Short Range Communications (DSRC) Performance Requirements for V2V Safety Awareness™ ASN File

V2X Vehicular Applications Technical Committee
  • Ground Vehicle Standard
  • J2945/2A_201907
  • Current
Published 2019-07-01 by SAE International in United States

This Abstract Syntax Notation (ASN.1) File is the precise source code used for SAE International Standard J2945/2. As part of an international treaty, all US ITS standards are expressed in "ASN.1 syntax". ASN.1 Syntax is used to define the messages or "ASN specifications". Using the ASN.1 specification, a compiler tool produces the ASN library which will then be used to produce encodings (The J2945/2 message set uses UPER encoding). The library is a set of many separate files that collectively implement the encoding and decoding of the standard. The library is then used by any application (along with the additional logic of that application) to manage the messages. The chosen ASN tool is used to produce a new copy of the library when changes are made, and it is then linked to the final application being developed. The ASN library manages many of the details associated with ASN syntax, allowing for subtle manipulation to make the best advantage of the encoding style.

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Dedicated Short Range Communications (DSRC) Performance Requirements for V2V Safety Awareness™ Set

V2X Vehicular Applications Technical Committee
  • Ground Vehicle Standard
  • J2945/2S_201907
  • Current
Published 2019-07-01 by SAE International in United States

This Abstract Syntax Notation (ASN.1) File is the precise source code used for SAE International Standard J2945/2. As part of an international treaty, all US ITS standards are expressed in "ASN.1 syntax". ASN.1 Syntax is used to define the messages or "ASN specifications". Using the ASN.1 specification, a compiler tool produces the ASN library which will then be used to produce encodings (The J2945/2 message set uses UPER encoding). The library is a set of many separate files that collectively implement the encoding and decoding of the standard. The library is then used by any application (along with the additional logic of that application) to manage the messages. The chosen ASN tool is used to produce a new copy of the library when changes are made, and it is then linked to the final application being developed. The ASN library manages many of the details associated with ASN syntax, allowing for subtle manipulation to make the best advantage of the encoding style.

The FACE™ of Military Modernization

  • Magazine Article
  • TBMG-34528
Published 2019-06-01 by Tech Briefs Media Group in United States

U.S. rival countries have been rapidly modernizing their militaries, with publicized advances that pose credible challenges to U.S. supremacy in all aspects of warfare: air, land, sea, space and cyberspace. On January 19, 2018 Secretary Mattis discussed the National Defense Strategy and emphasized the need to modernize key capabilities to address these threats. He stated: “To keep pace with our times, the department will transition to a culture of performance and affordability that operates at the speed of relevance. Success does not go to the country that develops a new technology first, but rather, to the one that better integrates it and more swiftly adapts its way of fighting. Our current bureaucratic processes are insufficiently responsive to the department's needs for new equipment. We will prioritize speed of delivery, continuous adaptation and frequent modular upgrades.”