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Viewing 1 to 30 of 23422
2015-01-14
Technical Paper
2015-26-0238
Arpit Kulshrestha, Nalin Rawat
During the conceptualization of vehicle, it is big challenge for automotive manufacturer to design a vehicle which has an excellent aesthetic looks as well as meet the stringent vehicle regulations. In the vehicle styling, bumper plays an important role in deciding of the contemporary looks of the vehicle. To improve customer satisfaction, it is important to design a bumper which provides feeling and sense of durability. In addition, bumper should sustain low-speed impact and protects the peripheral components such as parking lights, headlamps, hood, back door and safety related installed equipments like Rear parking camera, parking sensors, etc. Bumper should be dent resistant and be able to regain its original shape on removal of the applied load. An elegant design of bumper should be light weight with high strength. This paper explains about a new CAE methodology developed to simulate the real life loading condition of bumper and to calculate the deformation in the bumper.
2015-01-14
Technical Paper
2015-26-0239
Azeez Ahmed, Gopalakrishna Deshpande, Varghese Manu Varghese, Ramakrishnan R, Prakash Prashanth Ravi
Caterpillar Engine Development Test cells consist of expensive test and measurement systems. They also demand trained and skilled labour to ensure good quality data. Effective utilization of these test cells are a key enabler to meet stringent emission while meeting project time and cost targets. Engine Design process and tools when used effectively in the Engine Development can increase efficiency and lower test cell operation cost substantially. The paper discuss examples of this application in the area of Engine Install, Sensitive Instrumentation installation/assembly Example 1 With a vast catalogue of engines manufactured by Caterpillar, the test peripherals and engine mounting systems need to be designed and developed for specific engine size, horsepower etc. A conventional pallet system is not feasible for the installation of higher displacement engines because of its size.
2015-01-14
Technical Paper
2015-26-0240
Avinash Dhole, Chetan Raval, Rishi Shrivastava
In commercial vehicles which generally have large capacity fuel tank, sloshing of fuel and its effect on the tank structure is very important aspect during fuel tank design. Dynamic pressures exerted by the fuel on baffles, end plates and tank shell during sloshing can lead to failures and fuel leakage problems. Fluid structure interaction simulation of automotive fuel tank sloshing and its correlation with physical test is demonstrated in this study. During physical sloshing test of 350 L fuel tank, cracks were observed on center baffle and spot weld failures developed on fuel tank shell. Same sloshing test was simulated for one sloshing cycle using fluid structure interaction approach in LS Dyna explicit FE solver. Water was used instead of fuel. Mesh free smoothed particle hydrodynamics (SPH) method is used to represent water as it requires less computational time as compared to Eulerian or ALE method.
2015-01-14
Technical Paper
2015-26-0235
Raju P Soudatti, Amarnath R TBD, Harish Ramesh cEng
This paper deals the verification & Validation of passenger seat of buses for life cycle requirement. Through various methodologies adopted from Data collection, CAE verification and physical validation to verify the seat in virtual environment. Generally it is observed that in City Buses most of the time Passenger seat leg mounting area failures occurs in buses used for typically more than 3years. This fatigue failure doesn't get captured in either Anchorage test or limited vibration test. Passenger seats durability should be equal to vehicle life which is 10L or 12 Years of life span. Testing on Physical vibration (Rig) machine is time consuming and costly most of the time Machine availability for testing will be an issue to validate alternate seat proposals. There is need to establish a correlation between Physical testing and CAE simulation so that alternate proposals can be easily and quickly verified using CAE alone.
2015-01-14
Technical Paper
2015-26-0216
Ramesh Babu Pathuri, Prasanna Nagarhalli
During early phases of vehicle program, upfront performance prediction of cool pack i.e. CRFM (Condenser Radiator Fan Module) has become vital and hence simulation tools have gained tremendous importance. A 1D simulation model can be introduced early in the design process to evaluate several system configurations at different test conditions and results in reduced experimental work. These models also help the design engineers for better understanding of the physical phenomena of the engine cooling system and its optimization. Thus, there is always a need for more and more reliable simulation models. 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 at appropriate time in vehicle program. Air flow rates used on heat exchangers are predicted in 3D CFD analysis.
2015-01-14
Technical Paper
2015-26-0126
Prince Shital, Chiranjit Ghosh, Harveen Talwar, Avnish Gosain, Praneet Shanker Dayal
Three-cylinder Engine without balancer shaft is a recent trend towards development of lightweight and fuel-efficient power train for passenger car. In addition of that, customer's expectation of superior NVH inside driver 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 Power train’s rigid body modes with engine's firing frequency. This Overlapping of rigid body modes of power train 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
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 load cases 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
2015-26-0024
Sivanesan Murugesan, Lakshmikanthan Chinnasamy, Abhijeet Patil
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
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 calibre 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.
2014-11-26
Article
High-tech design causes time to remanufacture engines to nearly triple and adds to cost, while used engines remain a competitive factor. However, Purdue University data shows remanufacturing is far more energy efficient than installing a new powerplant.
2014-11-25
Article
Ophir Photonics’ 1000WP-BB-34 high-power water cooled thermal sensor is designed with the requirement that all materials coming in contact with the cooling water are either copper or nonmetallic.
2014-11-25
WIP Standard
AIR5464A
Over the past decade several metal clad fibers and fabrics have been developed to provide aerospace vehicle designers with a conductive, lighter weight alternative to coated copper or steel for shielding and harness overbraids of electrical cables. Several of these candidates have been unable to provide the strength or thermal stability necessary for the aerospace environment. However, the aramid-based products have shown remarkable resistance to the rigorous environment of aerospace vehicles. Concurrent with these fiber developments, there have been changes in the structures of aerospace vehicles involving greater use of nonmetallic outer surfaces. This has resulted in a need for increased shielding of electrical cables which adds substantial weight to the vehicle. Thus, a lighter weight shielding material has become more critical to meet the performance requirements of the vehicle.
2014-11-25
WIP Standard
AIR6853
This Aerospace Information Report (AIR) provides information on the thrust vectoring flight control systems incorporated on various aircraft development programs and production military aircraft. This report includes V/STOL aircraft thrust vector applications in addition to recommendations for use of thrust vectoring for the improvement of low speed maneuverability in conventional aircraft. Descriptions of each aircraft are provided along with a summary of the thrust vector control system, and, mechanical design methodologies used. Block diagrams, system schematics, and, several system level components are presented.
2014-11-25
Standard
ARP1953B
To describe general guidelines for achieving selected levels of cleanliness in gas turbine engine fuel system components and to describe laboratory methods for measuring and reporting the contamination level of the wetted portion of fuel system components. As in SAE J1227 (covering hydraulic components) this practice includes guidelines for levels of acceptance but does not attempt to set those levels.
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.
2014-11-24
Article
SEMA develops step-by-step system in conjunction with California Air Resources Board to help participating members comply with emissions regulations. Clemson University I-CAR is an active participant, providing laboratory facilities for analysis to aid SEMA members who are aftermarket manufacturers.
2014-11-23
WIP Standard
AS8040C
This SAE Aerospace Standard (AS) covers combustion heaters used in the following applications: a. Cabin heating (all occupied regions and windshield heating) b. Wing and empennage anti-icing c. Engine and accessory heating (when heater is installed as part of the aircraft) d. Aircraft de-icing
2014-11-20
Standard
ARP1827C
This SAE Aerospace Recommended Practice (ARP) delineates two complementary filter element performance ratings: (1) dirt capacity, and (2) filtration efficiency, and corresponding test procedures. It is intended for non-cleanable (disposable), fine fuel filter elements used in aviation gas turbine engine fuel systems.
2014-11-20
Standard
J2378_201411
This SAE Recommended Practice provides instructions and test procedures for air braked trailers and dollies used in single and multiple trailer combinations on highway. This document is not intended for off-highway application. Purpose This document provides a method of determining the efficiency of trailer and dolly air supply systems in filling reservoirs and, for those with spring applied parking brakes, in releasing parking brakes.
2014-11-18
WIP Standard
ARP6337
Define and develop test parameters, test methods, measurements, and acceptable performance criteria for composite aircraft seat structures.
2014-11-18
WIP Standard
J2071
As a simulation of road driving, wind tunnel testing of full-size vehicles produces certain errors in the aerodynamic forces, aerodynamic moments, and surface pressures. The magnitude of these errors, in general, depends on the following: a.) Flow quality, b.) Determination of the reference dynamic pressure, c.) Wind tunnel floor boundary layer, d.) Test section geometry and position of the car within that geometry, e.) Shape of the vehicle, f.) Blockage ratio: The ratio of the cross-sectional area of the vehicle to the cross-sectional area of the wind tunnel nozzle, g.) Wheel rotation, and h.) Internal flow in the model. The SAE Standards Committee, Open Throat Wind Tunnel Adjustments, had as a goal to document the knowledge of the influence of model interference on wind tunnel test results for automotive open jet wind tunnels. This document contains the following information related to this subject: a.) Design data of open throat wind tunnels, b.)
2014-11-16
WIP Standard
AMSP83461/1C
The purpose of this specification sheet is to set up a standardized part numbering system for O-rings procured to MIL-P-83461.
2014-11-14
WIP Standard
AIR5450A
The emerging ultra high bypass ratio ADP engines, with nozzle pressure ratios significantly lower, and bypass ratios significantly higher, than those of the current turbofan engines, may present new in-flight thrust determination challenges that are not specifically covered in AIR1703. This document addresses candidate methods and the additional challenges to the thrust determination for these ADP engines. These novel challenges result in part from the fact that some large ADP engines exceed present altitude test facility capabilities. The traditional methods of nozzle coefficient extrapolation may not be most satisfactory because of the increased error due to the ADP higher ratio of gross to net thrust, and because of the increased sensitivity of in-flight thrust uncertainty at the lower fan nozzle pressure ratio.
2014-11-14
WIP Standard
J1113/13
This SAE Standard specifies the test methods and procedures necessary to evaluate electrical components intended for automotive use to the threat of Electrostatic Discharges (ESDs). It describes test procedures for evaluating electrical components on the bench in the powered mode and for the packaging and handling non-powered mode. A procedure for calibrating the simulator that is used for electrostatic discharges is given in Appendix A. An example of how to calculate the RC Time Constant is given in Appendix B Functional Performance Status Classifications for immunity to ESD and Sensitivity classificatins for ESD sensitive devices are given in Appendix C.

Sensitivity classifications for ESD sensitive devices are given in Appendix B.

2014-11-13
WIP Standard
AIR5358A
This SAE Aerospace Information Report (AIR) was prepared by a panel of the SAE A-5 Committee. This document establishes the specifications for fluids used in landing gear shock struts with extreme pressure and antiwear additives that have been added for improved lubrication.
2014-11-12
Article
A Level 2 electric vehicle charger that can dispense power based on the available grid supply is undergoing its first field test in Detroit.
2014-11-11
Standard
J2377_201411
This SAE Recommended Practice (RP) provides test procedures for air braked trucks and truck-tractors used to tow single and multiple trailer combinations on highways. This RP is not intended for off-highway applications.
2014-11-10
WIP Standard
AS28937A
No scope available.
2014-11-10
WIP Standard
AS28938A
No scope available.
Viewing 1 to 30 of 23422

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