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2015-01-14
Technical Paper
2015-26-0024
Sivanesan M, Lakshmi Kanthan C, 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
2015-26-0237
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
2015-26-0238
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
2015-26-0234
Ramesh Pathuri, Yuvraj Patil, Prasanna Vyankatesh Nagarhalli
During early phases of vehicle program, evaluation of Air Conditioning (AC) system for its performance (time to comfort) and power consumption 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 AC system configurations and parametric studies at different test conditions and which results in reduced experimental work. This paper presents a method for AC cool down simulation of passenger car with multi air zone cabin model in KULI. This approach allows the prediction of zone wise (head, body and foot) temperature and humidity distribution in the cabin for parameter studies for transient analysis. The same cabin model can deal with multiple inlets into the cabin, solar radiation, and recirculation for pre-defined cabin types.
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.
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.
2014-11-18
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.
2014-11-06
Standard
ARP6225
This document is for establishing tire removal criteria of on-wing civil aircraft tires only. This document is primarily intended for use with commercial aircraft but may be used on other categories of civil aircraft as applicable. The criteria are harmonized with the Care and Service Manuals of the tire manufacturers for both radial and bias tires.
2014-11-06
Standard
ARP777A
It is intended that this ARP will set down guidelines for the development and test of reliable rotary vane and/or linear gas actuators. Specific operational and test requirements shall be specified in a detail specification. The areas to be discussed are: requirements (performance, environment, life, and reliability), design and fabrication, and test considerations.
2014-11-05
WIP Standard
ARP6887
The ARP shall cover the objectives and activities of Verification & Vallidation Processes required to assure high quality and/or criticality level of an IVHM Systems and Software.
2014-11-03
WIP Standard
AS53731A
This specification covers fuse holders for use in aircraft electric circuits in conjunction with MIL-F-5372 current limiter type fuses. These fuse holders are suitable for operation at -54 to 125C.
2014-11-02
WIP Standard
AS4459C
This SAE Aerospace Standard (AS) establishes the requirements for externally swaged tube-fitting assemblies used in aircraft fluid systems in the following pressure classes: B (1500 psi or 10 500 kPa), and D (3000 psi or 21 000 kPa), and in temperature types I (-65 to 160 °F or -55 to 70 °C), and II (-65 to 275 °F or -55 to 135 °C) of AS2001. This specification covers a common Cres, titanium, and aluminum fittings that may be used for a range of operating pressures up to 3000 psi with different tubing materials and tubing wall thicknesses, and is assembled with the same tooling in accordance with AS5902. Table 10 shows applicable aerospace fitting part number standard and tubing materials and operating pressures.
2014-11-02
WIP Standard
AS5008B
Scope is unavailable.
2014-10-31
WIP Standard
ARP6316
This SAE Aerospace Recommended Practice (ARP) documents a common understanding of terms, compliance issues and occupant injury criteria to facilitate certification of oblique facing seat installations specific to Part 25 aircraft.
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