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Viewing 31 to 60 of 19499
2016-04-05
Technical Paper
2016-01-0513
Yohei Miki, Hisao Futamata, Masahiko Inoue, Masashi Takekoshi, Kohbun Yamada
Unexpected noise may occur at around air intake manifold when the air throttle is quickly opened. In order to solve this problem, mesh is often mounted into the air flow between the manifold and the throttle. In this study the effect of mesh design on the noise reduction was investigated. Several designs of the mesh were tested with actual air intake unit, and the mechanism of the noise generation and its attenuation was discussed with visualization studies. Based on those experiments, an optimized mesh design was conducted. Furthermore integration of mesh and rubber gasket was examined. Finally rubber mesh-gaskets which provide sealing and noise attenuation for air intake has been proposed in this study.
2016-04-05
Technical Paper
2016-01-0501
Seung Hoon Hong, Frank Yan, Shin-Jang Sung, Jwo Pan, Xuming Su, Peter Friedman
Fatigue behavior of flow drill screw (FDS) joints in lap-shear specimens of aluminum 6082-T6 sheets with and without clearance hole are investigated based on experiments and a structural stress fatigue life estimation model. Lap-shear specimens with FDS joints were tested under quasi-static and cyclic loading conditions. Optical micrographs show that the failure modes of the FDS joints in specimens with and without clearance hole are quite similar under quasi-static and cyclic loading conditions. The fatigue lives of the FDS joints in specimens with clearance hole are longer than those of the FDS joints in specimens without clearance hole for given load ranges under cyclic loading conditions. A structural stress fatigue life estimation model is adopted to estimate the fatigue lives of the FDS joints in lap-shear specimens. The closed from structural stress solution is based on the analytical solution for a plate with a rigid inclusion under a resultant shear load.
2016-04-05
Technical Paper
2016-01-1381
Jiaqi Li, Jimin Ni, Xiuyong Shi
Sealing system is an important subsystem of modern high-performance engine. Sealing system reliability directly affects the engine operating conditions. Cylinder head gaskets(CHG) sealing system is of the most importance to the engine sealing system, which is not only responsible for sealing chamber, the cooling fluid and lubricating oil passage, for preventing gas leakage, water leakage and oil leakage, but also for force transferring between cylinder head and cylinder body. Basing on nonlinear solution method, the sealing performance of multi-layer-steel cylinder head gaskets to a gasoline engine is studied with the finite element software ABAQUS. The deformations of the cylinder liners and engine block are also considered.
2016-04-05
Journal Article
2016-01-0485
Jiaqi Li, Jimin Ni, Qiwei Wang
Turbochargers improve performance in internal combustion engines. Due to low production costs, TC assemblies are supported on floating ring bearings. In current lubrication analysis of floating ring bearing, inner and outer oil film are usually supposed to be adiabatic. The heat generated by frictional power is carried out by the lubricant flow. In reality, under real operating conditions, there existed heat transfer between the inner and outer film. This fraction of heat may have an effect on the lubrication performance of floating ring bearing. In this paper, the lubrication performance of floating ring bearing when considering heat transfer between inner film and outer film is studied. Based on the floating ring balance model, fluid lubrication model and heat dissipation model, the heat transferred through the ring between the inner and outer film is calculated and it is considered as one of the conditions to analyze lubrication performance.
2016-04-05
Technical Paper
2016-01-0507
Kazunori Miyake, Tomoya Nishida, Takanori Kurokawa, Hirokazu Arai
Sliding intermediate shaft of Electric Power Steering (EPS) system is used for torque transmission from steering wheel or motor and buffering reverse input from tire. Required performances of sliding intermediate shaft are lowering sliding loads and improvement of wear-resistance for prevention of rattle noise. Therefore, polyamide coating material with good sliding properties is treated in the sliding types of intermediate shaft. Conventionally, sliding types of intermediate shaft with polyamide coating have been used in vehicle interior. On the other hand, extension of applied area to engine room is needed. In that case use temperature rises from 80 ℃ to 120 ℃. However, in high temperature conditions, there is concerns about increase of friction coefficient and wear volume of polyamide by deterioration of sliding properties of polyamide. Therefore, improvement of sliding properties of polyamide in high temperature is necessary.
2016-04-05
Technical Paper
2016-01-0511
Na Qiu, Yunkai Gao, Jianguang Fang, Shanshan Wang
As a potential material for lightweighting, PMMA has proven to perform well in optical behavior and weather resistance. However, the application in automotive glazing, especially rear window considering its large size has seldom been studied. This paper aims to investigate the defrost performance of PMMA rear window using both numerical and experimental methods. The finite element analysis results were found to be in good agreement with the experimental data. Based on the validated finite element model, we further optimized the defrost efficiency by changing the arrangement of heating line. The results demonstrated the frost layer on the version-related region of PMMA rear window can melt within 30 minutes, which meet the requirement of defrost efficiency.
2016-04-05
Journal Article
2016-01-0527
Anthony Berejka, Dan Montoney, Dan Dispenza, Len Poveromo, Rick Galloway, Marshall Cleland, Mark Driscoll
The power demands in terms of kilowatt-hour electrical use were compared for autoclave curing commercial thermosetting carbon fiber pre-pregs with an innovative alternative of high energy X-ray curing. An automotive component, now made with carbon fiber composites, was selected as an illustrative example, an Aston-Martin hood. Temperature resistant polyester molds for these hoods were used. Ply lay-up was facilitated using an automated cutting device. Manufacturer recommended autoclave curing conditions were used to cure the matrices. X-rays, which can penetrate about 15 cm in unit density materials (as through mold walls), were used to cure pre-pregs made with a specialty matrix material using the same molds, but doing so without adding any heat for curing. High energy X-ray equipment, generated from a 7 MeV, 700 kW electron beam, is in commercial use for medical device sterilization, as are 10 MeV electron beams. This same equipment can also be used for composite curing.
2016-04-05
Technical Paper
2016-01-0092
Stijn Kerst, Barys Shyrokau, Edward Holweg
Active safety systems can be made more efficient, more robust and less complex if wheel load information would be available. This data can be obtained via different methods as for instance wheel force transducers or ‘smart tyres’. Both approaches however have difficulties related to usage in active vehicle dynamics control. The first approach, based on strain measurements in the rim, is too expensive for series application whilst the latter, based on accelerometers inside the tire, suffers from difficulties regarding its estimation bandwidth. In this paper a novel approach for the determination of wheel loading is proposed. The novel approach, based on strain measurements on the surface of the bearing outer-ring, is tested on both a dedicated bearing test setup as well as on a test vehicle. As a case study, a pure load based Anti-lock Braking algorithm is tested, which demonstrates that the novel approach provides the accuracy and bandwidth needed for active vehicle dynamics control.
2016-04-05
Journal Article
2016-01-0851
Alexander Nygaard, Mireia Altimira, Lisa Prahl Wittberg, Laszlo Fuchs
The process of disintegration of liquid jets is used in multitude of industrial applications, such as spray cooling, coating and fuel injection. Although the exact disintegration mechanisms are not yet known, it has been observed that intermittent injection can lead to better sprays in terms of the jet breakup rate and gas entrainment, which opens a new area of research within the field of atomization. In this paper we have carried out a systematic numerical analysis of the breakup of pulsated liquid jets in gaseous surroundings, under different injection conditions. More specifically, the duty cycle (time share of active injection during one injection cycle) is varied, while the total cycle time is kept constant. In order to provide an accurate, yet computationally acceptable resolution of the turbulent structures, the implicit Large Eddy Simulation framework has been adopted.
2016-04-05
Journal Article
2016-01-0862
PengBo Dong, Keiya Nishida, Takuya Inaba, Youichi Ogata
The tiny and normal injection quantity instances usually happen under the multi-injection strategy condition to restrain the uncontrollability of the ignition timing of the homogeneous charge compression ignition (HCCI) combustion concept. Meanwhile, instead of the traditional and fundamental single-hole diesel injector, the axisymmetric multi-hole injectors are usually applied to couple with the combustion chamber under most practical operating conditions. In the current paper, the internal flow and spray characteristics generated by single-hole and multi-hole (10 holes) nozzles under normal (2 mm3/hole) and tiny (0.3 mm3/hole) injection quantity conditions were investigated in conjunction with a series of experimental and computational methods. High-speed video observation was conducted at 10000 and 100000 fps under the condition of 120 MPa rail pressure, 1.5 MPa ambient pressure, room temperature, and nitrogen environment to visualize different spray properties.
2016-04-05
Technical Paper
2016-01-0839
Wenbin Yu, Wenming Yang, Balaji Mohan, Kunlin Tay, Feiyang Zhao, Yunpeng Zhang, Siawkiang Chou, Markus Kraft, Malcolm Andrew Alexander, Alfred Yong, Kwokhow Lou
In this study, the internal nozzle flow and macroscopic spray characteristics of a kind of wide distillation fuel (WDF) – kerosene were investigated both with numerical and experimental approaches. Simulation results indicate that compared with diesel fuel, kerosene cavitates more due to higher turbulent kinetic energy as a result of lower viscosity. The results from experiment indicate that under lower charge density, the spray penetration for kerosene is obviously shorter than that for diesel, especially for the lower injection pressure. This is because lower fuel viscosity results in a reduction in the size of the spray droplets, leading to lower momentum. However the spray angle of kerosene is larger compared with diesel due to stronger turbulence in the nozzle flow caused by increased cavitation for kerosene, which also accords well with the simulation results.
2016-02-11
WIP Standard
AS9805A
No scope available.
2016-02-11
WIP Standard
ARP1961A
This SAE Aerospace Recommended Practice (ARP) addresses the characteristics required for the definition, development, and acquisition of a satisfactory airframe mounted accessory gearbox (AMAG).
2016-02-09
Standard
AS5972F
SCOPE IS UNAVAILABLE.
2016-02-08
Article
Developers are starting to adapt complex design simulations into easy to use tablet apps. Could gear box designs using non-linear stress analysis, fatigue predictions, and CFD be coming to your smartphone?
2016-02-08
WIP Standard
AIR6384
This SAE Aerospace Information Report (AIR) is intended to provide guidance for installing GFI/AFCB in the fuel pumps power circuits for protection of fuel vapors ignition inside the tank in case of a failure that causing arcing inside the pump. Besides, this AIR is also intended to provide minimum specification and testing for ground fault interrupter (GFI) and arc fault circuit breaker (AFCB), addressing the issues associated with the verification requirements based on current regulatory guidance per AC25.981-1C.
2016-02-05
Magazine
Off-highway hybrids: Opportunities and challenges With oil prices declining and emissions regulations in North America 'stabilized,' is there a place for hybrid powertrains in this new world of cheap oil? Looking for a better image Display advances are helping to reduce operator fatigue. Charging up electrified powertrains Control technologies race forward while batteries improve and adopt standard sizes. Measuring and accounting for suspension TARDEC teamed with SEA Ltd. to develop a system to measure the suspension parameters, center of gravity, and moments of inertia of wheeled vehicles in the never ending quest to model and predict vehicle dynamic behavior. Looking at mobility in 2050 Cuneyt L. Oge begins his term as 2016 SAE International President with a vision about the future of auto- and aero-mobility.
2016-02-02
WIP Standard
AS6376
NEW PART STANDARDS TO BE ADDED TO THE PART FAMILY LISTS PER THE REQUIREMENTS OF AS4459
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