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Investigations on Headlamp and Car Body Tolerances in Real Life

Audi AG-Michael Hamm, Christian Hinterwalder
  • Technical Paper
  • 2020-01-0635
To be published on 2020-04-14 by SAE International in United States
Good Lighting is cruicial for safe driving at night. Unfortunately many parameters are contributing to the final result of the individual tolerances of car body, dynamics and headlamp: The resulting aim. The paper will collect and analyse tolerance contributors from body parameters like load, tire pressure, suspension as well as aging parameters of chassis and plastic parts.
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Study on Impact of SUV chassis stiffness on vehicle dynamics through CAE

Mahindra & Mahindra Ltd.-Visweswara Lenka, Baskar Anthonysamy
  • Technical Paper
  • 2020-01-1004
To be published on 2020-04-14 by SAE International in United States
Now a day’s automotive industry is a highly competitive market where continuous innovation in design and production of vehicles is required to gain market share and survive in the market. This resulted in the reduction of the life cycle of the design process and design tools. Identifying, understanding and refining these details is significant to develop sustainable cars. Body and Chassis stiffness are important specifications of a passenger car which affects handling, steering and ride characteristics of the vehicle. It has been proved that torsional, lateral and local chassis stiffness can play a role in giving the customer a premium feeling by affecting key metrics in the vehicle dynamics behaviour of a passenger car. In this paper, the effect of chassis stiffness on vehicle dynamics performance is studied using CAE. Different attributes of vehicle dynamics like vehicle handling, On-Center feel and vehicle ride are considered as performance characteristics. The chassis stiffness is varied by varying the material characteristics and evaluated the different performance attributes. It has been found the chassis stiffness influenced differently on On-center…
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Prodrive, Volta Trucks develop electric truck for urban driving

SAE Truck & Off-Highway Engineering: February 2020

Stuart Birch
  • Magazine Article
  • 20TOFHP02_10
Published 2020-02-01 by SAE International in United States

Mention the name Prodrive and most people will think of motorsport together with all the advanced technology that goes with it. But as an automotive consultancy, the company is now applying its capabilities to an advanced pureelectric truck project that has an added design aspect: to keep vulnerable road users safer in crowded environments.

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Sensor Fusion Concept for Improved Rotational Speed Measurement in Small Engines

Institute of Electrical Measurement and Measurement Signal P-Markus Neumayer, Thomas Bretterklieber, Thomas Suppan
  • Technical Paper
  • 2019-32-0519
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Future developments for small engines, e.g. engines for handheld working tools, like chain saws require the integration of ECU-systems for engine control. For small engines often only a rotational speed senor is available. The application of additional engine sensors is in many cases unwanted, e.g. due to cost aspects and additional wiring. The lack of sensor data requires tailored control strategies and signal processing techniques to infer information about the engine from the sensor data. E.g. for rotational speed sensors the Δω method has been proposed, where the load is estimated from the temporal variation of the rotational speed. This approach requires a rotational speed sensor with sufficient angular resolution. In this paper we present a simulation study for a sensor fusion concept to improve the temporal resolution of engine speed measurements for low cost engines by means of an additional vibration sensor. The rotational sensor of the engine is assumed to have insufficient resolution to determine variations of the rotational speed over an engine revolution. However, variations of the rotational speed of the engine…
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Material Characterization of Extruded Aluminum Axial Tubes as Energy-Absorbing Structural Members

SAE International Journal of Materials and Manufacturing

Ohio University, USA-Ali Muhammad, Ohioma Eboreime, Kraft Frank, Jenson Sean
  • Journal Article
  • 05-13-01-0004
Published 2019-11-21 by SAE International in United States
The increasing use of aluminum alloy extrusion in automotive vehicle chassis as structural members has necessitated the need to investigate their crushing behaviors. This article experimentally examines in detail, for the first time with respect to strength, ductility, and microstructure, AA6063-T7 (overaged) condition and the standard T6 temper and their capacity to meet crashworthiness requirements. Both tempers were assessed based on their mechanical properties (strength, ductility, true stress/strain behavior to necking, plastic anisotropy, strain rate sensitivity, and post-instability ductility to fracture) and microstructure, which were determined using basic tensile testing methods and metallographic approach. The implications of these properties/microstructures were further assessed experimentally by investigating the crushing behavior and energy absorption capacities of two extruded geometric profiles: a general rectangular profile and a novel cross-shaped profile investigated in a previous study. Typical modes of collapse were observed for rectangular tubes. In the case of the cross-shaped tubes, geometric modifications in the form of horizontal grooves along the sidewalls were introduced to promote controlled, stable, and repeatable folding patterns during the collapse in addition to serving…
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Torsional Stiffness Analysis of a Tubular Space-frame Chassis

SRM Institute of Science and Technology-Venkata Naga Bhavani Prasad Sodisetty, Anurag Pandey, Devansh Balachandran Iyer, Navneet Kumar
Published 2019-10-11 by SAE International in United States
Torsional Stiffness is required in an automotive whenever there is a biased lateral load on the vehicle as it happens during a turn. A torsionally stiff chassis would provide better stability and uniform load transfer in an automobile. The current trends in research aim at increasing the torsional stiffness and optimizing mass for the same and thus increasing the stiffness to mass ratio. This is validated with the help of various FEA softwares . The different cases involved in real world scenario are simulated and then the stiffness is optimized accordingly. This FEA analysis is further validated using experimental analysis. An experimental jig is fabricated and setup for every condition. Static conditions are used for both FEA and experimental analysis. A list of error reducing measures has been put in place and unavoidable errors have been taken into account. The deviation of the experimental stiffness has been plotted along with the results in FEA and the possible reasons have been taken into account. The variations present in the fabricated chassis lead to the deviation from…
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2020 Hyundai Palisade: New chassis, Atkinson V6

Automotive Engineering: September 2019

Kami Buchholz
  • Magazine Article
  • 19AUTP09_13
Published 2019-09-01 by SAE International in United States

The three-row 2020 Hyundai Palisade's strong, stable and quiet body structure serves as the starting point for ride quality, roll control and a quiet cabin. “We put a lot of resources toward this vehicle knowing it was going to be Hyundai's flagship SUV,” Michael O'Brien, vice president of product, corporate and digital planning for Hyundai Motor America, said at a recent media ride-and-drive program.

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An Optical-Based Technique to Obtain Vibration Characteristics of Rotating Tires

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Kettering University, USA-Aakash Mange, Theresa Atkinson, Jennifer Bastiaan, Javad Baqersad
  • Journal Article
  • 10-03-03-0013
Published 2019-08-21 by SAE International in United States
The dynamic characteristics of tires are critical in the overall vibrations of vehicles because the tire-road interface is the only medium of energy transfer between the vehicle and the road surface. Obtaining the natural frequencies and mode shapes of the tire helps in improving the comfort of the passengers. The vibrational characteristics of structures are usually obtained by performing conventional impact hammer modal testing, in which the structure is excited with an impact hammer and the response of the structure under excitation is captured using accelerometers. However, this approach only provides the response of the structure at a few discrete locations, and it is challenging to use this procedure for rotating structures. Digital Image Correlation (DIC) helps in overcoming these challenges by providing the full-field response of the structure. Although there have been many experiments on tires, there are few published papers that investigate the full-field dynamics of rotating tires at high rotating speeds. In the current work, the Kettering University Formula SAE (FSAE) vehicle is loaded on a chassis dynamometer for the purpose of…
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ZF's Current Work Builds for the EV, AV Future

Autonomous Vehicle Engineering: July 2019

Bill Visnic
  • Magazine Article
  • 19AVEP07_09
Published 2019-07-01 by SAE International in United States

The Tier-1 giant's “vision” for improving future mobility leverages its latest safety and chassis-development innovations.

As the product-development landscape for light-vehicle electrification and automated-driving technologies becomes less cluttered, it's apparent that established automotive Tier 1 mega-suppliers are intent on merging their established competencies with whatever new product lines are required in the electrified, automated future…whenever it comes.

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Simulation Analysis of a Dual-Purpose Intelligent Mobile Platform for Highway and Railway

University of Science and Technology Beijing-Nan Sun, Wenming Zhang, Jue Yang
Published 2019-06-05 by SAE International in United States
Railways play a huge role in China's transportation industry. In order to ensure intelligence, advanced technology and high efficiency in functions such as railway inspection, rescue and transportation, a dual-purpose intelligent mobile platform for both roads and railways was developed. Due to the height limitation of this platform, resilient wheels and rubber dampers with short stroke are used as the suspension system for the rail chassis. Based on this special suspension form, the dynamic model of the whole platform is derived, and the simulation model of the whole platform is established in the simulation software. The effects of resilient wheels’ axial stiffness, radial stiffness and vertical stiffness, lateral stiffness of rubber dampers on the vertical and lateral stability of the platform were studied. It is found that the increase of the radial stiffness of the resilient wheels will deteriorate the vertical stability and lateral stability of the platform. The increase in the axial stiffness of the resilient wheels will deteriorate the vertical stability of the platform and the lateral stability will be improved. The increase…
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