The SAE MOBILUS platform will continue to be accessible and populated with high quality technical content during the coronavirus (COVID-19) pandemic. x

Your Selections

Performance tests
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Development of the Defrost Performance Evaluation Technology in Automotive Using Design Optimization Analysis Method

Hyundai Mobis-Hyeonseok Seo, Jinwon Seo, Bongkeun Choi
  • Technical Paper
  • 2020-01-0155
To be published on 2020-04-14 by SAE International in United States
In this study, we developed the defrost performance evaluation technology using the multi-objective optimization method based on the CFD. The defrosting is one of the key factors to ensure the drivers’ safety using the forced flow having proper temperature from HVAC during drive. There are many factors affecting the defrost performance, but the configurations of guide-vane and discharge angles in the center DEF(defrosting) duct section which are main design factors of the defrost performance in automotive, so these were set to the design parameters for this study. For the shape-optimization study, the discharge mass flow rate from the HVAC which is transferred to the windshield and the discharge areas in the center defrost duct were set to the response parameters. And then, the standard deviation value of mass flow rate on the selected discharge areas checking the uniformity of discharge flow was set to the objective function to find the optimal design. The results on the windshield from optimization analysis were quantified from some kind of standards to evaluate the defrost performance, in particular, the…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Impact of different types of glazing on Air- Conditioning system performance of vehicle

Maruti Suzuki India, Ltd.-Akshay Bhateja
  • Technical Paper
  • 2020-01-1249
To be published on 2020-04-14 by SAE International in United States
Due to intense peak summer temperatures and sunny summers in tropical countries like India, achieving the required cabin temperature in vehicle without compromising on fuel efficiency is becoming increasingly challenging. The major source of heat load on vehicle is solar load. Therefore, a study has been conducted to evaluate the heat load on vehicle cabin due to solar radiations and its impact on vehicle Air-Conditioning system performance with various combinations of door glasses and windscreen. The glasses used for this study are classified as Green, Dark Green, Dark Gray, Standard PVB (Polyvinyl Butyral) Windscreen and PVB Windscreen having Infrared Cut particles. For each glass, part level evaluation was done to find out the percentage transmittance of light of different wavelengths and percentage transmittance of heat flux through each glass. To verify the effectiveness of each glass, vehicle level Air-Conditioning system performance test was done in All Weather Chassis Dyno Facility for each retrofitted vehicle. Retrofitted vehicle configurations were decided as per regional visible light transmittance regulations. To eliminate the effect of manufacturing variance while evaluating…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Bicycle Braking Performance Testing and Analysis

Momentum Engineering Corp.-Nicholas Famiglietti, Benjamin Nguyen, Edward Fatzinger, Jon Landerville
  • Technical Paper
  • 2020-01-0876
To be published on 2020-04-14 by SAE International in United States
The goal of this study was to determine the braking capabilities of different bicycle types, with different brake setups and applications. A variety of bicycles, including a mountain bike, beach cruiser, BMX bike, road bike, and commuter bike were used to perform brake-to-stop tests. Prior to brake testing, the bicycles were fully inspected, prepped, and documented. Details of the bicycles’ make, model, tires, wheels, brake setup, suspension setup, and preexisting damage were photographed and recorded. The standardized brake testing procedure consisted of rear only brake application and both front and rear brake application. In order to maintain brake application consistency, a single rider performed all series of the skid/brake tests at the same location, on dry asphalt. The tests were performed at an initial velocity of 9 – 20 mph. For each test, the rider accelerated to the test speed and applied maximum braking effort while maintaining a natural upright position to reduce lean. The tests were performed on a painted grid for visibility purposed in measuring skid lengths and post-test video analysis. The bicycle…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Analysis of Multistage Hybrid Powertrains Using Multistage Mixed-Integer Trajectory Optimization

Toyota Motor North America R&D-Shinhoon Kim, Ken Butts
University of Michigan - Ann Arbor-Huayi Li, Dominic Liao-McPherson, Ilya Kolmanovsky
  • Technical Paper
  • 2020-01-0274
To be published on 2020-04-14 by SAE International in United States
Increasingly complex hybrid electric vehicle (HEV) powertrains are being developed to address the growing stringency of emissions regulations, fuel economy standards and drivability/performance requirements. Early in their design process, it is desirable to rapidly evaluate powertrain architectures and components using simulation models before committing to costly physical prototyping. However, HEV powertrains have multiple controlled degrees of freedom, such as power split, engine on/off and gear selection, the operation of which needs to be pre-determined before a meaningful performance evaluation can be carried out.In this paper, we describe a multistage mixed integer trajectory optimization methodology that allows design engineers to rapidly perform performance analyses of complex powertrains. The methodology can generate optimal input signals for both continuous (engine torque or motor power) and discrete (engine on/off or gear selection) degrees of freedom for a given scenario. Moreover, the method is computationally efficient; it exploits characteristics of powertrain control problems, builds on existing nonlinear programming solvers and is highly parallelizable. We illustrate the utility of this technique by applying it to a Toyota multistage hybrid powertrain of…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

The Roles of Vehicle Seat Cushion Stiffness and Length in Child Restraint System (CRS) Performance

Ohio State University-Julie Mansfield, Yun-Seok Kang
Transportation Research Center Inc.-HyunJung Kwon
  • Technical Paper
  • 2020-01-0977
To be published on 2020-04-14 by SAE International in United States
The objective is to determine whether responses and injury risks for pediatric occupants in child restraint systems (CRS) are affected by vehicle seat cushion stiffness and fore/aft cushion length. Eighteen sled tests were conducted using the Federal Motor Vehicles Safety Standard (FMVSS) 213 frontal pulse (48 km/h). Seats from a recent model year vehicle were customized by the manufacturer with three different levels of cushion stiffness: compliant, mid-range, and stiff. Each stiffness level was quantified using ASTM D 3574-08 and all were within the realistic range of modern production seats. The usable length of each seat cushion was manipulated using foam spacers provided by the manufacturer. Two different seat lengths were examined: short (34.0 cm) and long (43.5 cm). Three different types of CRS were tested with size-appropriate anthropomorphic test devices (ATDs): rear-facing (RF) CRS with 12-month-old CRABI, forward-facing (FF) CRS with Hybrid III 3-year-old, and high-back booster with Hybrid III 6-year-old. Each CRS, vehicle seat (including cushion and frame), seat belt webbing and buckle were replaced after every test. ATD kinematic and kinetic data…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Off-Road Fuel Cell Vehicle Analysis and Development with a Model-Based Design Approach

AVL Powertrain UK-Tom Kigezi, Bill Insup Kim, Tommi Jokela, Bo Gao
  • Technical Paper
  • 2020-01-1170
To be published on 2020-04-14 by SAE International in United States
Fuel cell and battery electric powertrains are maturing zero-emission technologies expected to complement each other in the future. At present, battery electric powertrains have emerged competitive for urban light-duty transportation while fuel cell powertrains have emerged competitive in heavy-duty commercial transportation, alongside conventional internal combustion engine propulsion. This paper assesses the benefit for fuel cell powertrains in off-road vehicles, taking into account current and target industry data for powertrain components. Specific emphasis is placed on three important aspects, namely driving range, vehicle weight, and vehicle cost. A model-based design approach is then adopted to size the powertrain to meet a set of performance requirements. Owing to the high performance demands of off-road vehicles such as high gradeability and payload capacity, the paper evaluates the merits of a two-speed transmission in comparison to a single speed transmission under drive cycle and performance testing scenarios. A detailed fuel cell model is adopted and validated with real vehicle test data, also from which a highly scalable energy management system is systematically developed. This work adds to a growing…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.
new

Aircraft Instrument and Instrument System Standards: Wording Terminology, Phraseology, Environment and Design Standards For

A-4 Aircraft Instruments Committee
  • Aerospace Standard
  • AIR818E
  • Current
Published 2020-02-20 by SAE International in United States
This Aerospace Standard, (AS), specifies minimum performance standards for _____________ (Instrument or instrument systems) which are primarily intended for use with (vehicles capable of flight), ((fixed wing, rotary wing) aircraft)), (other special modifiers); (and whose purpose is to display _____________ information).
This content contains downloadable datasets
Annotation ability available
Open Access

Comparison of Stimuli for Nonlinear System Response Classification

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Chalmers University of Technology, Sweden-Thomas Abrahamsson
Volvo Car Corporation, Sweden-Niclas Andersson
  • Journal Article
  • 10-04-03-0014
Published 2020-02-13 by SAE International in United States
As part of the development of an automated virtual design classification approach for nonlinear structural dynamics, alternative excitation functions are evaluated with respect to their overall performance and efficiency in feature-based response analysis. Robust design of nonlinear structures requires analysis of extensive parameter variations. Both the character of the stimulus and feature metrics used are central to the performance of a response classification approach. The main purpose of this study is to compare stimulus candidates with respect to their efficiency in response classification. A deterministic multilevel, multifrequency stepped-sine periodic test function is used as a baseline. Order-wise differences between generalized and linearized system frequency response functions are evaluated by a selected feature metric to allow categorization into primary, sub and super harmonic responses, as well as odd and even order response distortions. An alternative excitation function type is the pseudorandom phase multi-sine. Its robust variant estimates the best linear approximation of the generalized frequency response function and related nonlinear and noise variances, which can be used for response classification. The fast variant of this method…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight Rating

Tow Vehicle Trailer Rating Committee
  • Ground Vehicle Standard
  • J2807_202002
  • Current
Published 2020-02-13 by SAE International in United States
This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles, and trucks. This includes all vehicles up to 14000 pounds GVWR.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Emergency Vehicle Sirens

Emergency Warning Lights and Devices Standards Committee
  • Ground Vehicle Standard
  • J1849_202002
  • Current
Published 2020-02-10 by SAE International in United States
This SAE Recommended Practice provides laboratory test procedures, requirements, and guidelines for electronic siren systems with a single loudspeaker, and electromechanical sirens for use on authorized emergency vehicles, which call for the right-of-way. Test procedures and performance requirements for individual system components are not included in this version. Results obtained for a siren system with a speaker array that is greater than 0.5 m in any dimension shall apply to the system only when the array is in the same spatial configuration as tested (i.e., the same speaker separation and orientation).
This content contains downloadable datasets
Annotation ability available