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Viewing 181 to 210 of 15616
2015-01-15
Standard
ARP1833B
The purpose of this standard is to provide the missile hydraulic and pneumatic component designer with information learned, tested and substantiated in correction of problems and failures experienced with seals that are subject to the unique requirements of missile static storage and subsequent dynamic operational conditions.
2015-01-15
Standard
AMS4987E
This specification covers a titanium alloy in the form of forgings 4.00 inches (101.6 mm) and under in nominal cross-sectional thickness and of forging stock of any size.
2015-01-15
Standard
AMS4520L
This specification covers a copper alloy in the form of strip. This strip has been used typically for rolled, split bushings, but usage is not limited to such applications.
2015-01-14
Standard
AMS7849E
This specification covers tantalum in the form of sheet, strip, plate, and foil up through 0.1875 inch (4.75 mm), inclusive.
2015-01-14
Standard
AMS7912D
This specification covers an aluminum-beryllium alloy in the form of bars, rods, tubing, and shapes consolidated from powder by extrusion.
2015-01-14
Technical Paper
2015-26-0019
Werner Bick, Cagri Cevik, Christoph Steffens
Abstract In order to minimize the development and production costs in the automotive industry, despite steadily increasing variety of models and applications offered by the OEMs, the pressure on standardization of components and production processes is increasing continuously. As a direct consequence, modular engine families are already established with high degrees of common parts and kits as well as standardized interfaces for all vehicle platforms by most manufacturers these days. At the same time, the world adopted and announced massive legal demands concerning the reduction of CO2 emissions for the entire vehicle fleet. In addition to the optimization of the combustion process, the exhaust gas aftertreatment and thermal management, the use of improved and more resilient materials for higher reduction of mechanical friction leads to a significant amount of the realized lowering in fuel consumption respective CO2 emissions.
2015-01-14
Technical Paper
2015-26-0029
Suresh Kumar Kandreegula, Umashanker Gupta, Swapnil Vyas
Abstract Proper sealing of an engine is very important parameter in an engine design. Even small amount of gas leakage from the engine can affect the overall performance of the engine during operation. There are two important factors in enhancing the efficiency of the sealing of the gasket are right tightening torque of bolts & gasket design. In this study, both the distribution of the contact pressure on the gasket, and the stresses of the cylinder head at different loading conditions, such as cold assembly, hot assembly, cold start, and hot firing, is simulated by commercial tool, based on the finite element method (FEM). The results shows that the efficiency of the sealing of the cylinder head gasket depends on the tightening torque of the hold-down bolts, without taking into consideration any thermal load resulting from the temperature distribution in the cylinder head.
2015-01-14
Technical Paper
2015-26-0127
Gaurav Paliwal, Naveen Sukumar, Umashanker Gupta, Saurav Roy, Hemantkumar Rathi
Abstract The main emphasis for a commercial vehicle design which was focused on fuel-economy and durability does not fulfill the increasing customer expectations anymore. Commercial vehicle designers need to focus on other vehicle aspects such as steering, ride comfort, NVH, braking, ergonomics and aesthetics in order to provide car like perception to truck, bus drivers and passengers during long distance drives. Powertrain mounting system must perform many functions. First and foremost, the mounting system must maintain & control the overall motion of the powertrain, to restrict its envelope reasonably, thereby avoiding damage to any vehicle component from the potential impact. This requires the mount to be stiff. Second the mount must provide good vibration isolation to have a comfortable ride to the vehicle occupant. This requires the mount to be soft.
2015-01-14
Technical Paper
2015-26-0140
Milind Ambardekar, Adatiya Yogesh, Sudhakara Naidu
Abstract Production variations of a heavy duty truck for its vibrations were measured and then analyzed through an Ishikawa diagram. Noise and Control factors of the truck idle shake were indentified. The major cause was found to be piece to piece variations of its power-train (PT) rubber mounts. To overcome the same, a new nominal level of the mount stiffness was sought based on minimization of a cost function related to vibration transmissibility and fatigue damage of the mounts under dynamic loadings. Physical prototypes of such mounts were proved to minimize the variations of the driver's seat shake at idling among various trucks of the same design. These learning's are useful for design of various subsystems or components to refine the full vehicle-Noise Vibration Harshness (NVH) at the robust design level.
2015-01-14
Technical Paper
2015-26-0154
Anand Ramalingam, Saravanakumar Thangamani
Abstract This paper discusses about the Flange design study carried out in Fuel Delivery Module (FDM) for meeting out contradictory requirements of robustness and crash worthiness. FDM is assembled in the fuel tank with flange covering the tank opening, and swirl pot assembly comprising fuel pump attached to flange through two steel struts. During crash, FDM undergoes sudden deceleration. Due to inertia, swirl pot assembly creates bending moment in the flange-strut interface. At such adverse condition, flange should not exhibit crack on the sealing side, as it might expose fuel in the fuel tank to the atmosphere. To ensure safety, flange-strut interface in the bottom side of flange is designed with higher stress concentration factor. So, the struts along with swirl pot assembly will break away from flange during crash without creating crack in the flange sealing faces.
2015-01-14
Technical Paper
2015-26-0215
T Sukumar, Murugan Subramanian, Sathish Kumar Subramaniyan, Nandakumar Subramanian
Abstract Reliable sealing solutions are extremely important in commercial vehicle industry because sealing failures can cause vehicle breakdown, damage of equipment or even accident, incurring expenses that are substantially higher than the costs of just replacing the damaged seals. Consequently, new seal designs must be experimentally verified and validated before they can be implemented. In this study, Mooney - Rivlin hyper elastic material model is used to simulate the sealing behavior during dynamic conditions. The seal under study is a large diameter lip seal made of Neoprene® rubber (NBR) A finite element model to study the response of the seal under dynamic conditions was developed. The analysis took into account the mating parts dimensions and the lip seal parameters. Three designs were proposed and verified. The seal design is optimized using non-linear FEA and validated. Results include contact pressure, deflection and strain experienced by the seal during actuation.
2015-01-14
Standard
AMS5704K
This specification covers a corrosion and heat-resistant nickel alloy in the form of forgings 3.25 inches (82.6 mm) and under, and forging stock of any size. (See 8.5).
2015-01-14
Standard
AMS5707M
This specification covers a corrosion and heat-resistant nickel alloy in the form of bars, forgings, flash welded rings, 3.25 inches (82.6 mm) and under and stock of any size for forging and for flash welded rings. (See 8.5).
2015-01-09
Standard
AS701D
SCOPE IS UNAVAILABLE.
2015-01-09
Standard
MA3391A
SCOPE IS UNAVAILABLE.
2015-01-09
Standard
MA3388A
SCOPE IS UNAVAILABLE.
2015-01-09
Standard
MA3390A
SCOPE IS UNAVAILABLE.
2015-01-09
Standard
AS9321A
SCOPE IS UNAVAILABLE.
2015-01-09
Standard
AS9105A
SCOPE IS UNAVAILABLE.
2015-01-09
Standard
AS4877D
This procurement specification covers bolts and screws made from a corrosion and heat resistant, age hardenable nickel base alloy of the type identified under the Unified Numbering System as UNS N07718.
2015-01-08
Standard
AMS2491F
This specification covers the engineering requirements for preparing surfaces of polytetrafluoroethylene (PTFE) for bonding and the properties resulting from the treatment. This process has been used typically for rendering surfaces of parts capable of supporting a high strength adhesive bond. The bonding preparation can affect the electrical properties of the PTFE and this should be considered before using it for treatment of electronic components.
2015-01-07
Standard
AMS7904E
This specification covers beryllium in the form of bars, rods, tubing, and machined shapes fabricated from vacuum hot pressed powder.
2015-01-07
Standard
AMS7906D
This specification covers beryllium in the form of bars, rods, tubing, and machined shapes from vacuum hot pressed powder.
2015-01-07
Standard
AMS7908D
This specification covers beryllium in the form of bar, rod, tubing, and shapes fabricated from beryllium powder consolidated by hot isostatic pressing (HIP).
Viewing 181 to 210 of 15616

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