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Viewing 61 to 90 of 23443
2015-04-14
Technical Paper
2015-01-0596
Oliver Scholz, Nikolas Doerfler, Lars Seifert, Uwe Zöller
Rubber seals are used throughout the automobile for a variety of purposes, and the consequences of a failure of such a seal can range from annoying in case of an A/C component to catastrophic in the case of brake components. With the constantly increasing requirements for these components regarding e.g. pressure or new refrigerants comes the requirement for ensuring surface properties according to the specification of the application. While automatic inspection systems are available for a variety of problems, the area of seal inspection is still dominated by manual labor, partly because handling of these small, inexpensive parts is difficult and partly because visual coverage of the entire sealing surface poses a problem. It is also difficult for a human inspector to objectively assess whether or not a surface defect is critical or not, especially given that inspection of each seal must be completed within a few seconds.
2015-04-14
Technical Paper
2015-01-0599
Akhilendra Pratap Singh, Aditya Gupta, Avinash Kumar Agarwal
Better understanding of flow phenomena inside the combustion chamber of a diesel engine and accurate measurement of flow parameters is necessary for engine optimization i.e. enhancing power output, fuel economy improvement and emissions control. Airflow structures developed inside the engine combustion chamber significantly influences the air-fuel mixing. In this study, in-cylinder air flow characteristics of a motored, four-valve diesel engine were investigated using time-resolved high-speed tomographic Particle Imaging Velocimetry (PIV). Single cylinder optical engine provides full optical access of combustion chamber through a transparent cylinder and flat transparent piston top. Experiments were performed in different vertical planes at different engine speeds during the intake, compression and exhaust stroke under motoring condition. For visualization of air flow pattern, graphite particles were used for flow seeding.
2015-04-14
Technical Paper
2015-01-0600
Marc Rosenbaum
A new generation of 3D inspection machines is now available to verify in line 3D dimensional conformity of complex parts – especially Powertrain ones – with accuracy down to 0.1 µm within manufacturing cycle time of large series. Inspecting in line 100% of production with an accuracy and at speed compatible with the most demanding part accuracy and fastest cycle time is presently already a reality for some large tier1 suppliers in Europe. Purpose of this paper is to introduce this breakthrough technology using state of the art non contact sensing technology allied with innovative mechanics and the latest developments in 3D metrology software
2015-04-14
Technical Paper
2015-01-1694
Jun Li, Predrag Hrnjak
This paper presents results of the visualization of the separation in the vertical header of the automotive condenser. A prototype of a heat exchanger was made that has inlet in the middle of the header, with 21 microchannel tubes as the first pass. In the second header liquid separates and leaves through 4 microchannel tubes beneath while mostly vapor leaves through 11 microchannel tubes on the top as another exit. That way the 2nd pass has liquid below first pass and vapor above it. R134a and R1234yf are used in the tests. Mass flow was in the range 30 - 80 g/s (mass flux 170 kg/m2·s to 450 kg/m2·s) and quality at the inlet to second header over a range of 0.1 to 0.3, to see their impact on the separation of two-phase flow inside the transparent header. Visualization data were taken to better understand and define the physical parameters that dominate the separation phenomena.
2015-04-14
Technical Paper
2015-01-0715
Terry Lynn Chapin, Van Walworth
Purpose Balancing the fill sequence of multiple cavities in a rubber injection mold is desirable for efficient cure rates, optimized cure times, and consistent quality of all molded parts. The reality is that most rubber injection molds do not provide a consistent uniform balanced fill sequence for all the cavities in the mold – even if the runner and cavity layout is geometrically balanced. A new runner design technique, named “The Vanturi Effect”, is disclosed to help address the inherent deficiencies of traditional runner and cavity layouts in order to achieve a more balanced fill sequence. Design/Methodology/Approach Specialized molds for rubber injection were designed and built with a series of hot runner layouts and specialized cavity shapes. Regressive short shot techniques were employed to establish how the runners filled and how the cavities filed. The injection series included matched pairs of identical molds with identical runner and cavity layouts.
2015-04-14
Technical Paper
2015-01-0680
Rong Zhang, Qian Zou, Gary Barber, Ben Zhou, Yucong Wang
In practice, the piston wrist pin is either fixed to the connecting rod or floats between the connecting rod and the piston. The tribological behavior of fixed wrist pins have been studied by several researchers, however there have been few studies done on the floating wrist pin. A new bench rig has been designed and constructed to investigate the tribological behavior between floating pins and pin bore bearings. The experiments were run using both fixed pins and floating pins under the same working conditions. It was found that for fixed pins there was severe damage on the pin bore in a very short time (5 minutes) and material transfer occurs between the wrist pin and pin bore; however, for the floating pin, even after a long testing time (60 minutes) there was minimal surface damage on either the pin bore or wrist pin.
2015-03-30
Technical Paper
2015-01-0095
Yu-Lung Hsu, Jau-Huai Lu, Ko-Chen Su
The main purpose of this research is to investigate the effect of volumetric efficiency of a four cylinder four stroke engine with different kinds of design parameters. There are several methods to improve the volumetric efficiency, such as changing the valve lift, the valve timing, the intake pipe parameters and setting the Helmholtz Resonator. In the research, we focus on two design parameters of intake system, adding Helmholtz Resonator and the valve timing. In Helmholtz Resonator part, we compare results of two conditions, with and without Helmholtz Resonator. Under the situation with Helmholtz Resonator, the position and the volume are also considered. And analyze the effect of the different kinds of design parameters on the volumetric efficiency. The position one of the resonator is between the gas storage tank and the air filter. There is only one intake pipe, so only one resonator is set on the pipe.
2015-03-30
Technical Paper
2015-01-0115
Nuwong Chollacoop, Manida Tongroon, Mongkon Kananont, Amornpoth Suebwong, Peerawat Saisirirat, Siamnat Panassorn, Paritud Bhandhubanyong
The effects of high quality biodiesel, namely, partially Hydrogenated Fatty Acid Methyl Ester or H-FAME, on 50,000km on-road durability test of unmodified common-rail vehicle have been investigated. Brand new Thailand popular common-rail light duty vehicle, Isuzu D-Max Extend cab, equipped with 4JK1-STD engine (DOHC 4-cylinder 2.5L, M/T 4x2, Euro III emission) was chosen to undergo on-road test composed of well-mixed types of mountain, suburb and urban road conditions over the entire 50,000km. Jatropha-derived high quality biodiesel, H-FAME, conforming to WWFC (worldwide fuel charter) specification, was blended with normal diesel (Euro IV) at 10% as tested fuel. Engine performance (torque and power), emission (CO, NOx, HC+NOx and PM), fuel consumption and dynamic response (0-100km acceleration time and maximum velocity) were analyzed at initial, middle and final distance; whereas, used lube oil analysis was conducted every 10,000km.
2015-03-10
Technical Paper
2015-01-0005
Sauhard Singh, Reji Mathai, A. K. Sehgal, R. Suresh, B. P. Das, Nishant Tyagi, Jaywant Mohite, N. B. Chougule
Considering the bleak scenario of rising fossil fuel prices coupled with limited availability and environment degradation caused by conventional fuels, it is not surprising that the world has turned its attention to use of alternative fuels. The ever increasing demand for ecologically friendly vehicles can only be met by use of ultra clean fuels like Compressed Natural Gas (CNG) and Hydrogen (H2). Lower carbon to hydrogen ratio of CNG makes it a cleaner fuel, due to this CNG is gaining popularity as an internal combustion (IC) engine fuel in transport sector. Hydrogen fuel for IC engines is also being considered as a future fuel due to its simple carbon less structure. But several obstacles have to be overcome before commercialization of H2 as an IC engine fuel for transport sector. The hydrogen enriched CNG fuel referred to as HCNG has the potential to lower emissions and is considered to be the first step towards promotion of a Hydrogen economy.
2015-01-31
Standard
AS6070/3
SCOPE IS UNAVAILABLE.
2015-01-26
WIP Standard
ARP6320
This Aerospace Recommended Practice (ARP) consists of methodologies for the measurement of non-volatile particulate matter (nvPM) emissions at the exit plane of aircraft gas turbine engines. The methods describe means of sampling and measuring particle mass concentration, particle number concentration and reporting of emissions indices through the use of an appropriate sampling system and instrumentation that goes beyond the measurements of visible obscuration as described in ARP 1179 for Smoke Number (SN).
2015-01-26
Standard
AS7119B
This Aerospace Standard (AS) establishes the requirements for suppliers of Electronics Printed Circuit Boards to be accredited by Nadcap. Nadcap accreditation is granted in accordance with SAE AS7003 after demonstrating compliance with the requirements herein. These requirements may be supplemented by additional requirements specified by Nadcap Electronics Task Group. Using the audit checklist (AC7119) will ensure that accredited Electronics Printed Circuit Boards suppliers meet all of the requirements in this standard and all applicable supplementary standards.
2015-01-23
WIP Standard
AIR6236
The standard will apply to (but not necessarily be limited to) cables, line impedance stabilization networks, pre-amplifiers, attenuators, current probes, etc.
2015-01-22
WIP Standard
ARP5996C
This method is designed to evaluate the coking propensity of synthetic ester-based aviation lubricants under single phase flow conditions found in certain parts of gas turbine engines, for instance in bearing feed tubes. This method is applicable to lubricants with a coking propensity, as determined by this method, falling in the range 0.01 to 3.00 mg.
2015-01-20
WIP Standard
AS81969/15
The specification/product is required to support connector specification applications.
2015-01-20
WIP Standard
AS81969/13
The specification/product is required to support connector specification applications.
2015-01-20
WIP Standard
AS81969/12
The specification/product is required to support connector specification applications.
2015-01-20
WIP Standard
AS22520/5
AS22520/5 IS A HAND CRIMPING TOOL USED TO CRIMP INSULATED AND UNINSULATED AS7928 TERMINALS, SPLICES, END CAPS, AND AS81824 SPLICES.
2015-01-20
WIP Standard
AS81969/21
The specification/product is required to support connector specification applications.
2015-01-20
WIP Standard
AS81969/22
The specification/product is required to support connector specification applications.
Viewing 61 to 90 of 23443

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