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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

Nan Sun
University of Science & Development-Wenming Zhang
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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Development of an Accelerated Test for Tire Flat-Spotting

NissanTechnical Center North America-Farokh Kavarana, Scott Fritz
Published 2019-06-05 by SAE International in United States
Tire flat-spotting occurs when tires remain in a loaded condition without rolling for an extended period of time, and can be temporary or permanent depending on the length of storage, vehicle loading and environmental factors. Tire non-uniformity caused from flat-spots often induce shake and shimmy vibration in vehicles due to increased tire-wheel force variation input into the chassis. This results in increased warranty costs for OEMs and tire suppliers and customer dis-satisfaction in third-party quality surveys such as J. D. Power IQS. Flat-spotting is of particular concern for slow-moving vehicle inventory parked for long periods at plants and/or dealership lots.OEMs often stipulate or recommend inventory storage practices for dealers that require physical movement of vehicles at some set duration to reduce the risk of tires developing permanent flat-spots. OEMs also provide component level flat-spotting requirements to tire manufacturers during sourcing and specification timing to secure their internal requirements and targets. The study in this paper initially determined real-world flat-spotting levels on an actual vehicle during the adverse summer months of Arizona. Tire uniformity measured on…
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Dynamics of Amphibious All-Terrain Vehicle’s Chassis Having Vibration Energy Harvesting Dampers

Mega Automation, Inc.-Dmytriy Gurevych
Nermar, Ltd.-George Nerubenko
Published 2019-06-05 by SAE International in United States
The rural off-road exploiting of amphibious all-terrain vehicles leads to the intensive vibrations of all parts of a vehicle, and specifically of its chassis. The tested amphibian vehicle’s chassis has the lowest natural frequency of 19.34 Hz. The Vibration Energy Harvesting Damper (VEHD) is used for mitigation of chassis vibrations. VEHD provides the mutually interconnected results: a reduction of undesired vibration levels and a generating of the additional electrical power. Newly patented VEHD consists of two main components: Tuned Mass Damper and Generator of Electricity. The perspective feature of proposed VEHD is the ability of effective vibration damping in a broad range of frequencies due to implementation of a control device, while that device is keeping automatically the changing natural frequency of VEHD equals to current frequency of the external force. The mathematical simulation analysis based on parameters of the amphibious all-terrain vehicle chassis is developed. The experiments arranged on recently designed amphibious all-terrain vehicle illustrate the compliance with theoretical predictions, and efficiency of proposed VEHD operating mainly in low frequency interval. An analysis of…
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A Mathematical Analysis of Off-Road Vehicle to Avoid “Hang Up” and “Nose In” Failures

Georgia Southern University-Aniruddha Mitra, Keith Russell
Published 2019-04-02 by SAE International in United States
The goal of this study was to determine the design constraints for the Georgia Southern SAE BAJA vehicle to operate in a rough terrain without unwanted direct body impact. The BAJA vehicle may encounter two distinct kinds of failure while climbing or descending terrain obstacles: Hang up failure, and Nose in failure. Hang up failure occurs when the bottom of the chassis of the vehicle makes contact with the obstacle. This occurs after the front tires have cleared the obstacle but before the rear tires have. This mitigates the pace of the vehicle but does not structurally threaten it. Nose in failure is when the protruding front bumper or “nose” of the vehicle makes contact with either the ground or the obstacle before or after encountering the obstacle. The possible ramifications of this event are much more disastrous than the Hang up failure. Nose in failure can send the vehicle into an end over end flip, or cause significant structural damage to the frame. Through a geometric analysis of the two situations, the critical values…
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Study of Energy Absorbing Front Cabin Mount, Its Stiffness Balance with Chassis and Test Correlation in Frontal Impact of Commercial Vehicle Cabin

Mahindra & Mahindra, Ltd.-Avinash Dhole, Rishi Shrivastava, Chetan Raval
Published 2019-04-02 by SAE International in United States
During design and development of a cabin for any commercial vehicle, meeting the strength requirements of front impact as per Indian regulation (AIS-029) is a very critical milestone. AIS-029 regulation consists of three destructive tests, i.e. Front Impact Test (Test A), Roof Strength (Test B) and Rear Wall Strength (Test C). Study of energy absorbing front cabin mount, its stiffness balance with chassis and CAE correlation with physical test is demonstrated in this study. [1]
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Comparison of Real-World Urban Driving Route PEMS Fuel Economy with Chassis Dynamometer CVS Results

Horiba Instruments Inc.-Michael Akard, Nathan Gramlich, Tim Nevius, Scott Porter
Published 2019-04-02 by SAE International in United States
The use of portable emissions measurement systems (PEMS) for testing vehicle emissions while driving on the road has been demonstrated as early as the 1980s. Many users have taken the driving route and repeated the route in a chassis cell with the same vehicle expecting identical results. Emission results can be comparable but there are many factors that need to be considered. This study compares PEMS results for a driving route repeated across seasons and traffic conditions with a single vehicle. The ambient temperature variability and traffic is shown to cause variation in emissions for any individual run. Generating a test cycle to mimic the driving route can be done in a variety of ways. The simplest is to take an individual driving run and translate the time and speed trace directly. This does not address the statistical results from numerous driving runs on the same route. A variety of test cycles are performed in the chassis cell with the same vehicle used to drive the route with results shown. Additionally, the chassis dynamometer used…
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