Criteria

Text:
Display:

Results

Viewing 1 to 30 of 4456
2015-04-14
Technical Paper
2015-01-0429
Na Xu, Chaochen Ma, Jianbing Gao, Zhiqiang Zhang, Xunzhi Qu
The low cycle fatigue experiment is extensively used to test the turbocharger reliability and durability. In the traditional low cycle fatigue test, a large air compressor is needed to drive the turbocharger under different operating conditions, which consume large amounts of electric power. This paper presents a new experiment device which has double chambers and double turbochargers. It can use the self-circulation manner to realize high and low speed switching as well as satisfy the temperature upper limit of turbine entry without the large air compressor. First, a detailed model is established in GT-Power and self-circulation test data can be used to validate the model. By utilizing the model, the relation between the valve opening and the flow distribution was obtained. Then, the dynamic simulation model is established in MATLAB/Simulink.
2015-04-14
Technical Paper
2015-01-0427
Zhigang Wei, Limin Luo, Shengbin Lin
In order to reduce time-to-market, fatigue design and validation of modern products are often based on accelerated testing results. This is especially true for the durability and reliability performance assessment of vehicle components and systems, based on the fact that the designed service lives with 10 years or greater for vehicle products are not very uncommon. However, fatigue test data often show intrinsic variations or noises due to the uncertainties involved in materials, testing and environment. Therefore, statistical data analysis, such as curve fitting and subsequent design curve construction, is a critical process for the accurate data interpretation and eventual product design and validation. Additionally, sample allocation and sample size can affect both the accuracy and the testing cost, therefore, testing should be properly planned and executed.
2015-04-14
Technical Paper
2015-01-1431
Mark H. Warner, Jon E. Bready, Wyatt Y. Warner, Alan F. Asay
Snowmobile acceleration, braking and cornering performance data are not well developed for use in accident reconstruction. Acceleration and braking data were published by D’Addario et. al. in SAE 2011-01-0287 which reported results of acceleration and braking testing on 4 snowmobiles of various make and model. This paper expands on the previous work and presents the results of new on-snow tests which include acceleration, braking and cornering maneuvers that have not been published previously. Maximum and average cornering speeds and resulting lateral accelerations are presented for turns of radius 15, 30 and 60 feet on level packed snow. Variation is reported between novice and expert riders in cornering applications. Performance values are also reported for acceleration, braking, and cornering tests where a passenger is included. All tests were performed on a level surface with consistent snow conditions throughout.
2015-04-14
Technical Paper
2015-01-1324
Guangtian Gavin Song, Chin-An Tan
In automotive industry, door slam CAE fatigue life analysis is very important in door durability evaluation and optimization to dramatically reduce the design cycle and minimize the expensive durability testing. Couple of linear stress based methodologies, such as inertia relief method, direct transient response solution, or local strain approach, have been applied in CAE. Linear material properties are used in these linear stress based methodologies. In local strain approach, contact surface could be defined in the necessary area. Then the stress time history is retrieved and input to further fatigue life analysis or firstly converted to nonlinear stress with Neuber’s rule to consider plastic deformation effect. But under some circumstances, the structure may have large local area plastic deformation. So the linear stress based methodology can’t precisely predict the load path, and further affect the accuracy of fatigue analysis.
2015-04-14
Journal Article
2015-01-1164
Aimee N. Duhon, Kris S. Sevel, Steven A. Tarnowsky, Peter J. Savagian
Evaluation of one year of in-use operating data from first generation Chevrolet Volt Extended-Range Electric Vehicle (E-REV) retail customers determined initial trip Internal Combustion Engine (ICE) starts were reduced by 70% relative to conventional vehicles under the same driving conditions. These Volt drivers were able to travel 74% of their total miles in EV without requiring the ICE’s support. Using this first generation Volt data, performance of the second generation Volt is projected. The Southern California Association of Governments (SCAG) Regional Travel Survey (RTS) data set was also processed to make comparisons between realistic PHEV constraints and E-REV configurations. A Volt characteristic E-REV was found to provide up to 40 times more all-electric trips than a PHEV over the same data set.
2015-04-14
Journal Article
2015-01-0528
Armin Abedini, Cliff Butcher, David Anderson, Michael Worswick, Timothy Skszek
The development of stress state dependent fracture surfaces and damage models to predict failure in automotive forming and crash simulations has created great interests in developing experimental tests to characterize failure in constant stress states. The stress state is defined by the three invariants of the stress tensor that are typically expressed in terms of the stress triaxiality and lode parameters. The shear loading condition is critical to the development of the fracture surfaces since it corresponds to the origin of the surface with a stress triaxiality and lode parameter of zero. Numerous types of in-plane shear tests have been proposed in the literature that are suitable to automotive sheet materials with the butterfly-like specimens becoming popular in recent years. The butterfly shear test involves through-thickness machining of the specimen to create a reduced section where fracture will initiate.
2015-04-14
Technical Paper
2015-01-0591
Karan R. Khanse, Eric Pierce, Michael Ng, Saied Taheri
Abstract Outdoor objective evaluations form an important part of both tire and vehicle design process since they validate the design parameters through actual tests and can provide insight into the functional performances associated with the vehicle. Even with the industry focused towards developing simulation models, their need cannot be completely eliminated as they form the basis for approving the performance predictions of any newly developed model. An objective test was conducted to measure the ABS performance as part of validation of a tire simulation design tool. A sample vehicle and a set of tires were used to perform the tests- on a road with known profile. These specific vehicle and tire sets were selected due to the availability of the vehicle parameters, tire parameters and the ABS control logic. A test matrix was generated based on the validation requirements.
2015-03-30
Technical Paper
2015-01-0115
Nuwong Chollacoop, Manida Tongroon, Mongkon Kananont, Amornpoth Suebwong, Peerawat Saisirirat, Siamnat Panassorn, Paritud Bhandhubanyong
Abstract The effects of high quality biodiesel, namely, partially Hydrogenated Fatty Acid Methyl Ester or H-FAME, on 50,000km on-road durability test of unmodified common-rail vehicle have been investigated. Thailand popular brand new common-rail light duty vehicle, Isuzu D-Max Spacecab, equipped with 4JK1-STD engine (DOHC 4-cylinder 2.5L, M/T 4×2, Euro III emission) was chosen to undergo on-road test composed of well-mixed types of mountain, suburb and urban road conditions over the entire 50,000km. Jatropha-derived high quality biodiesel, H-FAME, conforming to WWFC (worldwide fuel charter) specification, was blended with normal diesel (Euro IV) at 10% (v/v) as tested fuel. Engine performance (torque and power), emission (CO, NOx, HC+NOx and PM), fuel consumption and dynamic response (0-100km acceleration time and maximum velocity) were analyzed at initial, middle and final distance; whereas, used lube oil analysis was conducted every 10,000km.
2015-03-10
Technical Paper
2015-01-0028
Jihyun An, Seungwon Yoo, KwangChan Ko, Jongchan Park
Abstract This paper presents an industrial application of the Analytical Target Cascading (ATC) methodology to the optimal design of commercial vehicle steering and suspension system. This is a pilot study about the suspension and steering design of a semi medium bus, whose objective is to develop and introduce an ATC methodology to an automobile development process. In the conventional process, it is difficult not only to find design variables which meet the target of Ride and Handling (R&H) performance using a detailed full car model, but also to figure out the interrelation between the vehicle and its subsystems. In this study, ATC methodology is used in order to obtain the optimal values such as geometric characteristics satisfying both the vehicle's R&H target and the subsystem (suspension and steering system) 's target.
2015-03-10
Technical Paper
2015-01-0005
Sauhard Singh, Reji Mathai, A. K. Sehgal, R. Suresh, B. P. Das, Nishant Tyagi, Jaywant Mohite, N. B. Chougule
Abstract Depletion of fossil fuel reserves, the unsteadiness of their prices and the increasingly stricter exhaust emission legislation put forward attention of world towards use of alternate fuels. The ever increasing demand for ecologically friendly vehicles can be met by use of clean fuels like Compressed Natural Gas (CNG) and Hydrogen (H2). Lower carbon to hydrogen ratio of CNG makes it a cleaner fuel, due to this CNG is gaining popularity as an internal combustion (IC) engine fuel in transport sector. Hydrogen fuel for IC engines is also being considered as a future fuel due to its simple carbon less structure. However, several obstacles have to be overcome before widespread utilization of hydrogen as an IC engine fuel can occur in the transport sector. The 18 percent hydrogen enriched CNG fuel referred to as HCNG has the potential to lower emissions and could be considered a first step towards promotion of a Hydrogen economy.
2015-01-15
Standard
AS6502
This SAE Aerospace Standard (AS) provides classical propulsion system performance parameter names for aircraft propulsion systems and their derivatives, and describes the logical framework by which new names can be constructed. The contents of this document were, originally, a subset of AS755E. Due to the growing complexity of station numbering schemes described in AS755, and a desire to expand the original document's nomenclature section to include a fuller representation of "classical" (legacy use) names, a decision was made to separate its "station numbering" and "nomenclature" content into two separate documents. This document, then, was created using the "nomenclature" half of AS755E. Both documents will continue to be improved and revised as industry needs dictate. The parameter naming conventions presented herein are for use in all communications concerning propulsion system performance such as computer programs, data reduction, design activities, and published documents.
2015-01-14
Technical Paper
2015-26-0024
Sivanesan Murugesan, Lakshmikanthan Chinnasamy, Abhijeet Patil
Abstract Appropriate test cycle is required for engine testing. To do so, a new methodology is developed for deriving Engine Test Cycle based on real world duty cycle. Transient speed and load is to be collected from the functional engine on the field. The duty cycle for cyclic operation will be developed from the actual transient speed and load conditions. An iterative process and the comparison of chi-square statistical data is used to categorize typical microtrips, segments of engine operation collected during performance of certain activities. Different microtrips of all activities were combined together to make up a cycle of operation and test cycle as well. These data's are compared to statistical data which is used to illustrate the raw data. On successful comparison, the transient test cycle is validated on the test bed. To facilitate further engine testing, the cycle is transformed into a schedule of torque and speed points at One second intervals.
2015-01-14
Technical Paper
2015-26-0075
Ashwin Subramanian Kaundinya, Yogesh S Thipse, Vinayak Shivalink Sagare, Neelkanth V Marathe
Abstract In the quest towards meeting stringent emission norms as well as robust performance requirements, there is an ever growing need to continually research into and develop high caliber engines. This necessitates handling huge amounts of generated test data that monitors a multitude of variables like engine speed, combustion chamber pressure, engine load and the like. Further, in order to establish the scalar engine performance parameters like efficiency, Brake Mean Effective Pressure, Indicated Mean Effective Pressure, P-V diagram, post processing is required to be done on the measured test data that involves complex calculations like numerical integration and other mathematical operations on a grand scale. In order to meet this objective, the authors hereby showcase a knowledge based algorithm that integrates and streamlines the entire procedure from handling of the huge test data to performing all the calculations in order to arrive at the scalar engine performance parameters.
2015-01-14
Technical Paper
2015-26-0126
Prince Shital, Chiranjit Ghosh, Harveen Talwar, Avnish Gosain, Praneet Shanker Dayal
Abstract Three-cylinder Engine without balancer shaft is a recent trend towards development of lightweight and fuel-efficient powertrain for passenger car. In addition, customer's expectation of superior NVH inside vehicle cabin is increasing day by day. Engine mounts address majority of the NVH issues related to transfer of vibration from engine to passenger cabin. Idle vibration isolation for a three-cylinder engine is a challenging task due to possibility of overlapping of Powertrain's rigid body modes with engine's firing frequency. This Overlapping of rigid body can be avoided either by modifying mount characteristic or by changing the position of mounts based on multi-body-dynamics (MBD) simulation. This paper explains about two types of engine mounting system for a front-wheel drive transversely mounted three-cylinder engine. The base vehicle was having three-point mounting system i.e. all three engine mounts were pre-loaded.
2015-01-14
Technical Paper
2015-26-0237
Rajendra More, Darshan Vachhani, Chetan Raval
Abstract Strength and durability of commercial vehicle structure is of prime importance to users while quicker time to market and least material cost are demands of competitive world. This requires assessment not just with simplistic loadcases but robust and accurate predictions closely co-relating real proving ground conditions. This paper demonstrates systematic approach of first road load predictions using MBD model, then stress analysis using FE model and finally life prediction using fatigue solver. MBD model was built using flex body, air suspensions with rigid links and tires with FTire characteristics. Same model ran on various virtual proving grounds and load history at various joints were extracted. Then inertia relief stress analysis with unit loads were carried out in Nastran and output stresses were mapped against load history in fatigue solver.
2015-01-14
Technical Paper
2015-26-0216
Ramesh Babu Pathuri, Prasanna Nagarhalli
Abstract Upfront in a vehicle program, sizing of front end cooling module i.e. Condenser Radiator Fan Module (CRFM) and front grille opening is vital hence simulation tools like 1D have gained tremendous importance. This paper focuses on the modeling and analyzing performance behavior of engine cooling system using 1D simulation tool and also discusses the correlation of simulated results with test results. 1D model of engine cooling system is developed by inputting all necessary geometrical and performance data of all components (radiator heat load, coolant pipe geometry, CRFM, pump, thermostat etc.) with necessary assumptions. Air flow rates used on heat exchangers are predicted in 3D Computation Fluid Dynamics (CFD) analysis. First isothermal coolant circuit is modeled and coolant flow correlation is achieved to build confidence in modeling.
2014-12-02
Standard
J2139_201412
This SAE Recommended Practice provides standardized laboratory tests, test methods, and performance requirements applicable to signal and marking devices used on vehicles 2032 mm or more in overall width.
2014-12-02
Standard
J2087_201412
This SAE Standard provides test procedures, requirements, and guidelines for a daytime running light (DRL) function.
2014-11-25
Standard
J267_201411
This SAE Recommended Practice provides minimum performance requirements and uniform laboratory procedures for fatigue testing of wheels and demountable rims intended for normal highway use on trucks, buses, truck-trailers, and multipurpose vehicles. Users may establish design criteria exceeding the minimum performance requirement for added confidence in a design. The cycle requirements noted in Tables 1 and 2 are based on Weibull statistics using 2 parameter, median ranks, 50% confidence level and 90% reliability, and beta equal to 2, typically noted as B10C50. For other wheels intended for normal highway use and temporary use on passenger cars, light trucks, and multipurpose vehicles, see SAE J328. For wheels used on trailers drawn by passenger cars, light trucks, or multipurpose vehicles, see SAE J1204. For bolt together military wheels, see SAE J1992. This document does not cover other special application wheels and rims.
Viewing 1 to 30 of 4456

Filter

  • Range:
    to:
  • Year: