The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Masaaki Takiguchi - One of the best experts on this subject based on the ideXlab platform.
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analysis of Oil Film Thickness on a piston ring of diesel engine effect of Oil Film temperature
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2003Co-Authors: Yasuo Harigaya, Michiyoshi Suzuki, Masaaki TakiguchiAbstract:This paper describes an analysis of Oil Film Thickness on a piston ring of a diesel engine. The analysis of the Oil Film Thickness has been performed by using Reynolds equation and unsteady, two-dimensional energy equation with heat generated from viscous dissipation. The mean Oil Film temperature was determined from the calculation of the temperature distribution in the Oil field which was calculated using the energy equation. The Oil Film viscosity was then estimated using the mean Oil Film temperature. The effect of Oil Film temperature on the Oil Film Thickness of a piston ring was examined. This model has been verified with published experimental results. Moreover, the heat flow at ring and liner surfaces was examined. Results show that the Oil Film Thickness could be calculated using the viscosity estimated from the mean Oil Film temperature. The calculated values generally agree with the measured values. For higher engine speed conditions, the maximum values of the calculated Oil Film Thickness are larger than the measured values.
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development of a technique to predict Oil consumption with consideration for cylinder deformation prediction of ring Oil Film Thickness and amount of Oil passing across running surface under cylinder deformation
SAE transactions, 2003Co-Authors: Takeshi Yamada, Masaaki Takiguchi, Hiroyuki Kobayashi, Kazunori Kusama, Junichi Sagawa, Tatsuya IshikawaAbstract:Although various factors affecting Oil consumption of an internal combustion engine can be considered, a technique to predict the amount of Oil consumed within a cylinder that passes across a running surface of a ring wasdeveloped in this study. In order to predict the effect of cylinder deformation on Oil consumption, a simple and easy technique to calculate the Oil Film Thickness in deformed cylinder was proposed. For this technique, the piston ring was assumed to be a straight beam, and the beam bends with ring tension, gas pressure, and Oil Film pressure. From the calculated Oil Film Thickness, amount of Oil passing across the running surface of the TOP ring and into the combustion chamber was calculated. The calculated results were then compared to the Oil Film Thickness of the ring and Oil consumption measured during engine operation, and their validity was confirmed. As a result, the Oil Film Thickness of the ring calculated by this technique was extremely close to the measured value, showing that it is possible to predict the Oil Film Thickness in deformed cylinder using this simple and easy technique. In addition, the change in the amount of Oil passing across the running surface of the TOP ring due to cylinder deformation calculated by this technique was confirmed to match qualitatively the effect of cylinder deformation on Oil consumption.
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Development of a Small LIF System for Oil Film Thickness Measurements
Design Application Performance and Emissions of Modern Internal Combustion Engine Systems and Components, 2002Co-Authors: Shinya Suguru, Shimizu Masanao, Masaaki Takiguchi, Kenshi Ushijima, Shunichi AoyamaAbstract:Laser-induced fluorescence (LIF) measurement device has been employed for measuring Oil Film Thickness of piston and piston rings in an internal combustion engine. Reducing the size of the measurement apparatus is believed to expand the application of the LIF method. Thus, an experimental small-scale LIF measurement device has been developed. A blue laser diode was used for the light source, and a photo diode was used for the fluorescence light detection. Including such elements as lenses and optical filters, the width, length, and Thickness of the device are 30, 30, and 15 mm, respectively. A drive circuit for the blue laser diode was constructed to stabilize the laser light intensity, and an amplification circuit was made for the photo diode to improve the light detection sensitivity as well as the signal frequency response. The results of the preliminary tests determined sufficient sensitivity, linearity, and frequency response required for the Oil Film Thickness measurement. Subsequently, the device was tested on a diesel truck air compressor, and the piston ring Oil Film Thickness was measured. The measurement results were compared with the results obtained with a conventional LIF measurement device consisting of a He-Cd laser unit and a photomultiplier. In accordance with the experimental results, the small LIF measurement device was determined to have an allowable capability for the Oil Film Thickness measurement in an internal combustion engine.© 2002 ASME
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analysis of Oil Film Thickness and heat transfer on a piston ring of a diesel engine effect of lubricant viscosity
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2002Co-Authors: Yasuo Harigaya, Michiyoshi Suzuki, Fujio Toda, Masaaki TakiguchiAbstract:The effect of lubricant viscosity on the temperature and Thickness in Oil Film on a piston ring in a diesel engine was analyzed by using unsteady state thermohydrodynamic lubrication analysis, that is Reynolds equation and an unsteady state two-dimensional (2-D) energy equation with heat generated from viscous dissipation. The Oil Film viscosity was then estimated by using the mean Oil Film temperature and the shear rate for multi grade Oils. The shear rate between the ring and liner becomes higher, so that the viscosity for the multi grade Oil is affected by the Oil Film temperature and shear rate, and the viscosity becomes lower. Under low temperature condition, the viscosity becomes lower due to viscous heating and shear rate and under higher temperature condition, the viscosity affected by the shear rate becomes lower. The Oil Film Thickness between the ring and liner decreases with decrease of the Oil viscosity, and it is the thinnest that the Oil Film Thickness is calculated by using the viscosity estimated by both the shear rate and the Oil Film temperature. Moreover, the heat transfer at ring and liner surfaces was examined.Copyright © 2002 by ASME
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Analysis of Oil Film Thickness on a Piston Ring of Diesel Engine: Effect of Oil Film Temperature
Volume 3: Engine Systems: Lubrication Wear Components System Dynamics and Design, 2001Co-Authors: Yasuo Harigaya, Michiyoshi Suzuki, Masaaki TakiguchiAbstract:Abstract This paper describes that an analysis of Oil Film Thickness on a piston ring of diesel engine. The Oil Film Thickness has been performed by using Reynolds equation and unsteady, two-dimensional (2-D) energy equation with a heat generated from viscous dissipation. The temperature distribution in the Oil Film is calculated by using the energy equation and the mean Oil Film temperature is computed. Then the viscosity of Oil Film is estimated by using the mean Oil Film temperature. The effect of Oil Film temperature on the Oil Film Thickness of a piston ring was examined. This model has been verified with published experimental results. Moreover, the heat flow at ring and liner surfaces was examined. As a result, the Oil Film Thickness could be calculated by using the viscosity estimated from the mean Oil Film temperature and the calculated value is agreement with the measured values.
Bruce W Drinkwater - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonic Oil-Film Thickness measurement: an angular spectrum approach to assess performance limits.
The Journal of the Acoustical Society of America, 2020Co-Authors: Jie Zhang, Bruce W Drinkwater, Rob S Dwyer-joyceAbstract:The performance of ultrasonic Oil-Film Thickness measurement in a ball bearing is quantified. A range of different viscosity Oils (Shell T68, VG15, and VG5) are used to explore the lowest reflection coefficient and hence the thinnest Oil-Film Thickness that the system can measure. The results show a minimum reflection coefficient of 0.07 for both Oil VG15 and VG5 and 0.09 for Oil T68 at 50 MHz. This corresponds to an Oil-Film Thickness of 0.4 microm for T68 Oil. An angular spectrum (or Fourier decomposition) approach is used to analyze the performance of this configuration. This models the interaction of component plane waves with the measurement system and quantifies the effect of the key parameters (transducer aperture, focal length, and center frequency). The simulation shows that for a focused transducer the reflection coefficient tends to a limiting value at small Oil-Film Thickness. For the transducer used in this paper it is shown that the limiting reflection coefficient is 0.05 and the Oil-Film measurement errors increase as the reflection coefficient approaches this value. The implications for improved measurement systems are then discussed.
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thin Oil Film Thickness distribution measurement using ultrasonic arrays
Ndt & E International, 2008Co-Authors: Jie Zhang, Bruce W DrinkwaterAbstract:Abstract This paper describes an approach for calculating the Oil-Film Thickness distribution in machine elements using an ultrasonic array, based on the measurement of normal and oblique incidence reflection coefficients. An experimental system is described in which a high-precision digital piezoelectric translator (DPT) is used to controllably displace the surfaces in a steel–Oil–steel system and hence alter the Oil-Film Thickness by a known amount. This three-layer system was chosen to be representative of a typical lubricated contact found in various machine elements such as bearings, gears and seals. In such lubricated systems the Oil-Film Thickness typically ranges from 0.1 to 100 μm and this paper explores the range 2–9 μm experimentally. In the measurements described, reflection coefficients were obtained from transmitter–receiver pairs of an ultrasonic array. In this way, each reflection coefficient measurement corresponds to a point on the Oil-Film and is related to a specific incidence angle. The Oil-Film Thickness distributions were then extracted from these reflection coefficients via a multi-layer model. The measured Oil-Film Thicknesses are shown to be in good quantitative agreement with the known displacements. This demonstrates the potential of this approach for the measurement of Oil-Film Thickness distribution in lubricated contacts.
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ultrasonic Oil Film Thickness measurement an angular spectrum approach to assess performance limits
Journal of the Acoustical Society of America, 2007Co-Authors: Jie Zhang, Bruce W Drinkwater, R S DwyerjoyceAbstract:The performance of ultrasonic Oil-Film Thickness measurement in a ball bearing is quantified. A range of different viscosity Oils (Shell T68, VG15, and VG5) are used to explore the lowest reflection coefficient and hence the thinnest Oil-Film Thickness that the system can measure. The results show a minimum reflection coefficient of 0.07 for both Oil VG15 and VG5 and 0.09 for Oil T68 at 50MHz. This corresponds to an Oil-Film Thickness of 0.4μm for T68 Oil. An angular spectrum (or Fourier decomposition) approach is used to analyze the performance of this configuration. This models the interaction of component plane waves with the measurement system and quantifies the effect of the key parameters (transducer aperture, focal length, and center frequency). The simulation shows that for a focused transducer the reflection coefficient tends to a limiting value at small Oil-Film Thickness. For the transducer used in this paper it is shown that the limiting reflection coefficient is 0.05 and the Oil-Film measurem...
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The Measurement of Oil Film Thickness in Ball Bearings Using Ultrasound
Quantitative Nondestructive Evaluation, 2006Co-Authors: Jie Zhang, Bruce W Drinkwater, Rob Dwyer-joyceAbstract:An Oil‐Film Thickness monitoring system capable of providing early warning of lubrication failure in rolling element bearings has been developed. Apparatus is described in which a 6016 deep groove ball bearing can be controllably tested under various operating conditions. A quasistatic spring model is used to calculate Oil‐Film Thickness from the measured reflection coefficient data. The ultrasonically measured Oil‐Film Thicknesses obtained are shown to agree well with the predictions from classical elastohydrodynamic lubrication theory.
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Ultrasonic Phase and Amplitude and the Measurement of Oil Film Thickness
World Tribology Congress III Volume 1, 2005Co-Authors: Rob Dwyer-joyce, Tom Reddyhoff, Bruce W DrinkwaterAbstract:The reflection of ultrasound at an Oil Film can be used to determine the Film Thickness. A thin Oil Film reflects less ultrasound than a thick Film. When the Film is thin there is a simple relationship between Oil Film Thickness and the proportion of the wave amplitude reflected. The reflection coefficient is in fact a complex quantity with both magnitude and phase. A model for how both the phase and amplitude vary with Oil Film Thickness (and the properties of the bearing materials) has been developed. It has been shown that both can be used to determine Film Thickness. Tests have been performed to determine the Oil Film Thickness and explore the relationship between reflection amplitude and phase. Experiments are performed both on a static Oil Film between flat plates, and on an operating journal bearing. Both methods provide a simple accurate method for the measurement of Oil Film Thickness.
Julia Himmelsbach - One of the best experts on this subject based on the ideXlab platform.
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Influence of High Rotational Speeds on Heat Transfer and Oil Film Thickness in Aero-Engine Bearing Chambers
Journal of Engineering for Gas Turbines and Power, 1994Co-Authors: S. Wittig, A Glahn, Julia HimmelsbachAbstract:Increasing the thermal loading of bearing chambers in modern aero-engines requires advanced techniques for the determination of heat transfer characteristics. In the present study, Film Thickness and heat transfer measurements have been carried out for the complex two-phase Oil/air flow in bearing chambers. In order to ensure real engine conditions, a new test facility has been built up, designed for rotational speeds up to n = 16,000 rpm and maximum flow temperatures of Tmax = 473 K. Sealing air and lubrication Oil flow can be varied nearly in the whole range of aero-engine applications. Special interest is directed toward the development of an ultrasonic Oil Film Thickness measuring technique, which can be used without any reaction on the flow inside the chamber. The determination of local heat transfer at the bearing chamber housing is based on a well-known temperature gradient method using surface temperature measurements and a finite element code to determine temperature distributions within the bearing chamber housing. The influence of high rotational speed on the local heat transfer and the Oil Film Thickness is discussed.
Vishal Saxena - One of the best experts on this subject based on the ideXlab platform.
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measurement of dynamic lubricating Oil Film Thickness between piston ring and liner in a motored engine
Sensors and Actuators A-physical, 2009Co-Authors: Atul Dhar, Avinash Kumar Agarwal, Vishal SaxenaAbstract:Abstract The interface between the piston rings and cylinder liner plays an important role in total frictional losses and mechanical wear of internal combustion engines and is increasingly coming under scrutiny as legislated particulate emission standards are becoming more and more stringent. The capacitance method is used for measurement of minimum Oil Film Thickness at the piston ring–liner interface in the present investigations. Measurement of capacitance formed between the piston ring and a probe mounted flush with the liner provides an accurate measurement of Oil Film Thickness provided that the region between the probe and liner is flooded with lubricating Oil whose dielectric constant is known. This paper presents detailed design of sensor, instrumentation and measurement of lubricating Oil Film Thickness using capacitive micro-sensor. The present investigation is carried out in a motored engine in order to validate the sensor and instrumentation and it can be directly employed in a firing engine also. The Oil Film Thickness was measured at different speeds at three different locations, i.e. close to TDC, mid stroke position and close to BDC position and the results are accordingly presented in this paper. Lubricating Oil Film Thickness is found to vary between 0.2 and 8 μm in the motored engine. At a particular position, lubricating Oil Film Thickness varies significantly in upward and downward stroke of the engine due to reversal in direction of piston tilt.
Jie Zhang - One of the best experts on this subject based on the ideXlab platform.
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Ultrasonic Oil-Film Thickness measurement: an angular spectrum approach to assess performance limits.
The Journal of the Acoustical Society of America, 2020Co-Authors: Jie Zhang, Bruce W Drinkwater, Rob S Dwyer-joyceAbstract:The performance of ultrasonic Oil-Film Thickness measurement in a ball bearing is quantified. A range of different viscosity Oils (Shell T68, VG15, and VG5) are used to explore the lowest reflection coefficient and hence the thinnest Oil-Film Thickness that the system can measure. The results show a minimum reflection coefficient of 0.07 for both Oil VG15 and VG5 and 0.09 for Oil T68 at 50 MHz. This corresponds to an Oil-Film Thickness of 0.4 microm for T68 Oil. An angular spectrum (or Fourier decomposition) approach is used to analyze the performance of this configuration. This models the interaction of component plane waves with the measurement system and quantifies the effect of the key parameters (transducer aperture, focal length, and center frequency). The simulation shows that for a focused transducer the reflection coefficient tends to a limiting value at small Oil-Film Thickness. For the transducer used in this paper it is shown that the limiting reflection coefficient is 0.05 and the Oil-Film measurement errors increase as the reflection coefficient approaches this value. The implications for improved measurement systems are then discussed.
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thin Oil Film Thickness distribution measurement using ultrasonic arrays
Ndt & E International, 2008Co-Authors: Jie Zhang, Bruce W DrinkwaterAbstract:Abstract This paper describes an approach for calculating the Oil-Film Thickness distribution in machine elements using an ultrasonic array, based on the measurement of normal and oblique incidence reflection coefficients. An experimental system is described in which a high-precision digital piezoelectric translator (DPT) is used to controllably displace the surfaces in a steel–Oil–steel system and hence alter the Oil-Film Thickness by a known amount. This three-layer system was chosen to be representative of a typical lubricated contact found in various machine elements such as bearings, gears and seals. In such lubricated systems the Oil-Film Thickness typically ranges from 0.1 to 100 μm and this paper explores the range 2–9 μm experimentally. In the measurements described, reflection coefficients were obtained from transmitter–receiver pairs of an ultrasonic array. In this way, each reflection coefficient measurement corresponds to a point on the Oil-Film and is related to a specific incidence angle. The Oil-Film Thickness distributions were then extracted from these reflection coefficients via a multi-layer model. The measured Oil-Film Thicknesses are shown to be in good quantitative agreement with the known displacements. This demonstrates the potential of this approach for the measurement of Oil-Film Thickness distribution in lubricated contacts.
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ultrasonic Oil Film Thickness measurement an angular spectrum approach to assess performance limits
Journal of the Acoustical Society of America, 2007Co-Authors: Jie Zhang, Bruce W Drinkwater, R S DwyerjoyceAbstract:The performance of ultrasonic Oil-Film Thickness measurement in a ball bearing is quantified. A range of different viscosity Oils (Shell T68, VG15, and VG5) are used to explore the lowest reflection coefficient and hence the thinnest Oil-Film Thickness that the system can measure. The results show a minimum reflection coefficient of 0.07 for both Oil VG15 and VG5 and 0.09 for Oil T68 at 50MHz. This corresponds to an Oil-Film Thickness of 0.4μm for T68 Oil. An angular spectrum (or Fourier decomposition) approach is used to analyze the performance of this configuration. This models the interaction of component plane waves with the measurement system and quantifies the effect of the key parameters (transducer aperture, focal length, and center frequency). The simulation shows that for a focused transducer the reflection coefficient tends to a limiting value at small Oil-Film Thickness. For the transducer used in this paper it is shown that the limiting reflection coefficient is 0.05 and the Oil-Film measurem...
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The Measurement of Oil Film Thickness in Ball Bearings Using Ultrasound
Quantitative Nondestructive Evaluation, 2006Co-Authors: Jie Zhang, Bruce W Drinkwater, Rob Dwyer-joyceAbstract:An Oil‐Film Thickness monitoring system capable of providing early warning of lubrication failure in rolling element bearings has been developed. Apparatus is described in which a 6016 deep groove ball bearing can be controllably tested under various operating conditions. A quasistatic spring model is used to calculate Oil‐Film Thickness from the measured reflection coefficient data. The ultrasonically measured Oil‐Film Thicknesses obtained are shown to agree well with the predictions from classical elastohydrodynamic lubrication theory.
