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Viewing 31 to 60 of 15572
2015-04-14
Technical Paper
2015-01-0921
Raul Payri, Jaime Gimeno, Pedro Marti-Aldaravi, Marcos Carreres
Proper initial conditions are essential to successfully perform a simulation, specially for highly transient problems such Diesel spray injection. Until now, no much attention has been paid to the internal nozzle flow initialization because spray simulations are usually decoupled from the nozzle. However, new homogeneous models, such Eulerian Spray Atomization (ESA) model, allow simulating the internal nozzle flow and the spray seamlessly. Therefore, behavior of the spray for the first microseconds is highly influenced by the initial conditions inside the nozzle. Furthermore, last experiments confirm the presence of gas inside the nozzle between following injections. This work deals with the initilialization procedure in a way that mass flow rate, momentum flux and spray penetration curves are well predicted by the model.
2015-04-14
Technical Paper
2015-01-0944
Maryam Moulai, Ronald Grover, Scott Parrish, David Schmidt
Abstract A computational and experimental study was performed to characterize the flow within a gasoline injector and the ensuing sprays. The computations included the effects of turbulence, cavitation, flash-boiling, compressibility, and the presence of non-condensible gases. The flow domain corresponded to the Engine Combustion Network's Spray G, an eight-hole counterbore injector operating in a variety of conditions. First, a rate tube method was used to measure the rate of injection, which was then used to define inlet boundary conditions for simulation. Correspondingly, injection under submerged conditions was simulated for direct comparison with experimental measurements of discharge coefficient. Next, the internal flow and external spray into pressurized nitrogen were simulated under the base spray G conditions. Finally, injection under flashing conditions was simulated, where the ambient pressure was below the vapor pressure of the fuel.
2015-04-14
Technical Paper
2015-01-1499
Tadatsugu Takada, Kazuki Tomioka
Honda developed the right and left independent toe-angle control system (first-generation P-AWS) in the Acura RLX in 2013 and announced it as the first in the world. As indicated in a previous paper, “Independent Left and Right Rear Toe Control System,” with this system Honda has realized an excellent balance between the fun of handling that is at the driver’s will (INOMAMA) and driving performance with a sense of stability. This first-generation P-AWS is designed to be optimal to the vehicle specifications (suspension axial force, steering gear ratio, etc.) of the Acura RLX. Honda is due to widely adapt P-AWS to other models from now on. Following this, we developed the next-generation P-AWS system (second-generation P-AWS) in order to reconcile system performance and low cost wherever possible, in order to be adaptable for all ACURA models.
2015-04-14
Technical Paper
2015-01-1285
Dingfeng Deng, Fanghui Shi, Louis Begin, Isaac Du
Several instances have occurred where the outer surface of turbocharger fully floating journal bearing bushings have exhibited damage from oil debris resulting in loud constant tone noises and subsequent warranty claims. This paper studies the effect of oil debris in Turbocharger journal bearings on Subsynchronous NVH. A CFD model is built to study the behavior of oil debris particles with different sizes. The oil debris particles tend to navigate to the inner film or outer film of bearing bushing depending on the drag and centrifugal forces. It is found that the dominant centrifugal forces prevent larger particles from reaching the inner film while smaller particles travel more easily to the inner film. It is also found that the turbine side is more likely to become damaged from debris than the compressor side bearing due to higher temperatures. A tribology analysis is executed to determine the effect of oil debris particles on the speed ratio of the bearing bushing to the shaft.
2015-04-14
Technical Paper
2015-01-1671
Mohamed El Morsy, Gabriela Achtenova
In this paper, a fault in rolling bearing is diagnosed using time waveform analysis. In order to verify the ability of time waveform analysis in fault diagnosis of rolling bearing, an artificial fault is introduced in vehicle gearbox bearing: an orthogonal placed groove on the inner race with the initial width of 0.65 mm approximately. The faulted bearing is a roller bearing located on the gearbox input shaft – on the clutch side. An optimal Morlet Wavelet Filter and autocorrelation enhancement are applied in this paper. First, to eliminate the frequency associated with interferential vibrations, the vibration signal is filtered with a band-pass filter determined by a Morlet wavelet whose parameters are optimized based on maximum Kurtosis. Then, to further reduce the residual in-band noise and highlight the periodic impulsive feature, autocorrelation enhancement is applied to the filtered signal.
2015-04-14
Technical Paper
2015-01-1675
Yongfu Chen, Zhengfei Tang, Peijun Xu, Yunqing Zhang
A method for dynamic analysis and design of Powertrain Mounting System(PMS) is developed with the aim of reducing the vibration of the PMS, which is very significant to improve ride comfort. A nine degrees of freedom(DoF) dynamic model is established, including a powertrain and a chassis. The dynamic stiffness of the mounting is taken as the design parameter. Decreasing the dynamic force between the powertrain and the frame is the optimization objective. The initial values of the dynamic stiffness are obtained by finite element analysis. Due to the frequency dependence of dynamic stiffness, the dynamic stiffness is optimized at lower frequency section and high frequency section respectively. In addition, the deformation of the mounting under the gravity of powertrain is limited, which further determines the range of dynamic stiffness.
2015-04-14
Journal Article
2015-01-0457
Subrata Sarkar, Kailash Golecha, Surbhi Kohli, Amit Kalmegh
Journal bearings are machine elements designed to produce smooth (low friction) motion between solid surfaces in relative motion and to generate a load support for mechanical components. With Journal bearings the entire load is carried by a thin film of fluid present between the rotating and non-rotating elements. Thickness of the film is very sensitive to the environment temperature, radial clearance and misalignment. These parameters are very difficult to control and it is very important to consider all the parameters while designing the Journal bearing. When noises in the design space are very strong, conventional DOE or RSM method suppresses the effect of control factors. This will result in poor design of the product and lead to higher cost. The overall objective of the present work is to produce a bearing design which is insensitive to the noises at each stage of product life cycle.
2015-03-30
Technical Paper
2015-01-0126
Meng Choung Chiong, Srithar Rajoo, Alessandro Romagnoli
Abstract This paper presents a concept for new piston expander utilizing nozzle as part of a secondary steam cycle to recover exhaust energy. A commercial 1D simulation tool, AVL BOOST, was used to model the system, and comparison study was carried out between the conventional and nozzle piston expanders. It was found the nozzle piston expander could increase output power from a minimum of 0.73kW up to a maximum of 4.75kW. The simulation study has shown that the concept of using nozzle to admit steam into the piston expander has potential to improve engine system level efficiency.
2015-03-10
Technical Paper
2015-01-0066
Luke Spiteri, Stephen Daynes, Simon Watkins
Abstract A morphing ram-air intake, capable of deploying from a flat, closed surface to an open state is investigated. Via geometric and material optimisation, an origami-inspired folding structure is developed to exhibit bi-stable behaviour. An iterative finite element design process was conducted, noting the effects of the critical design properties of geometry, bending stiffness and material strain limits on bi-stability and the achievable geometric shape change. As a first step, thermoplastic polyurethane elastomer materials are proposed while increased stiffness by fibre reinforcements are considered at a later design stage and evaluated under aerodynamic loading. The bi-stable structure is capable of remaining in either open or closed stable configurations without sustained actuation. The ability to retract the intake when not required has the potential to reduce drag. It is envisioned that such a concept may be readily adopted within automotive and aerospace applications.
2015-02-26
Standard
J58_201502
Included in this SAE Standard are the detailed general and dimensional specifications applicable to flanged 12-point screws recognized as SAE Standard and intended for general use in automotive and other ground-based vehicles and industrial equipment. The inclusion of dimensional data in this standard is not intended to imply that all of the products described are stock production sizes. Consumers should consult manufacturers concerning availability of product.
2015-02-26
Standard
J2593_201502
This information report provides general information for installing and tightening fluid conductors and connectors. Following these guidelines, with the consistent proper use of torque wrenches, tightening procedures and correct torque levels will result in diminishing leaks and improving service life by avoiding hose twisting, tube binding, false torque and improper joint closures. Since many factors influence the pressure at which a hydraulic system will or will not perform satisfactorily, this report should not be used as a "standard" nor a "specification" and the values shown should not be construed as "guaranteed" minimums, maximums or absolutes. This document is an information report to help users by gathering available information from the various connector standards and publishing the information in one source for easy retrieval and applied common usage. This information report is primarily intended for mobile/stationary industrial equipment applications.
2015-02-25
WIP Standard
J2656
This SAE Part Standard covers selected inch dimensioned set screws manufactured in accordance with American Society for Mechanical Engineers dimensional standards. This SAE standard covers material most often used in ship systems and equipment but its use may be applied wherever fasteners of the covered materials are used. This standard permits the fasteners to be identified and ordered by a part identification number (PIN) as defined in this document.
2015-02-25
Standard
AMS4634C
This specification covers an aluminum bronze alloy in the form of bars, rods, forgings, and forging stock.
2015-02-24
Standard
AS9058C
SCOPE IS UNAVAILABLE.
2015-02-24
Standard
AS7240A
This procurement specification covers plain helical lock washers fabricated from heat treated carbon steel.
2015-02-24
Standard
AS92C
SCOPE IS UNAVAILABLE.
2015-02-24
Standard
AS7253C
This procurement specification covers all metal, self-locking wrenching nuts, plate nuts, shank nuts, and gang channel nuts made of a corrosion and heat resistant nickel-base alloy of the type identified under the Unified Numbering System as UNS N07001.
2015-02-24
Standard
AMS03_1
This SAE Standards specifies the processes and type of impregnant which can be used when impregnating castings for the following purposes: a. For the recovery of ferrous and non-ferrous castings containing micro porosity, where pressure tightness is mandatory. b. for sealing castings/sinter metal components to improve corrosion resistance and/or to render the surface suitable for subsequent surface treatment.
2015-02-23
WIP Standard
AIR1273B
This SAE Aerospace Information Report establishes a positive identification of the functions and, if applicable, the hazards and direction of flow of pipe, hose, tube, or electrical conduit lines.
2015-02-19
WIP Standard
J1236
The purpose of this SAE Recommended Practice is to establish specifications for use as a guide to the automatic transmission and hydraulic systems designer, helping him to select cast iron sealing ring width, thickness, coatings, and other accepted design details.
2015-02-17
Standard
AS4735B
SCOPE IS UNAVAILABLE.
2015-02-17
Standard
AS7481C
This procurement specification covers studs made from a corrosion and heat resistant age hardenable iron base alloy of the type identified under Unified Numbering System as UNS S66286 and of 130 ksi tensile strength at room temperature, with maximum test temperature of parts at 1200 °F.
2015-02-17
Standard
AS5406D
SCOPE IS UNAVAILABLE.
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