The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Kakuro Amasaka - One of the best experts on this subject based on the ideXlab platform.
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CAE Analysis for Oil Leakage Mechanism of Transaxle Oil Seal
IOSR Journal of Computer Engineering, 2020Co-Authors: Ryo Akaiwa, Kakuro AmasakaAbstract:In recent years, the authors have been conducting research on the establishment of technical prevention measures for automobile development and design. This research investigates the mechanisms that cause Oil leaks in drive train Oil Seals, which are a matter of concern for automobile manufacturers around the world. In the case of automobile transaxle Oil Seals, the edge of the Seal's rubber lip is in sliding contact with the surface of the drive shaft, and the Seal serves to prevent the lubricating Oil Sealed inside the drive gearbox from leaking to the outside. In this paper, the authors take up the example of analyzing the mechanisms by which Oil leaks caused by wear of drive train Oil Seals. In order to demonstrate this, the authors incorporated a model of the Oil film on sliding surfaces and simulated the Oil Seals' Sealing performance. The authors also incorporated the analysis model for CAE, combining a fluid model, an Oil Seal sliding surface model, and methods such as the finite element method. Thus, the authors contributed to establishing technical prevention measures for automobile development and design utilizing CAE.
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A CAE method of design optimization for quality assurance: Analyzing cavitation caused by metal particles in the transaxle
2011 IEEE SICE International Symposium on System Integration (SII), 2011Co-Authors: Yasuaki Nozawa, Ryosuke Yamashita, Kakuro AmasakaAbstract:In this paper, the authors address the technological problem of Oil Seal leakage in automotive drive trains as a way to construct a CAE method of design optimization for quality assurance. The model is used to explain cavitation caused by the metal particles (foreign matter) generated through transaxle wear. Their method primarily uses numerical simulation to clarify the technological mechanism generating Oil leaks as a result of foreign metallic substances entering Oil Seals in the drive train. They then use this research to develop a CAE method of design optimization for quality assurance in the hopes of contributing to more robust vehicle design.
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An Analysis Of Bottleneck Technology By Using Experiments And CAE -Example Of The Automotive Transaxle Oil Seal Leakage-
International Business & Economics Research Journal (IBER), 2010Co-Authors: Masatoshi Sato, Manabu Yamaji, Kakuro AmasakaAbstract:This research aims to clarify the technological mechanism by using experiment and CAE (Computer Aided Engineering). Concretely, we take up the automotive transaxle Oil Seal leakage. To clarify an unknown mechanism, the dynamic behavior on the surface of the Seal lip in the drive shaft high-speed rotation was observed with the visualization device. The authors thus achieved the desired results.
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AN INTEGRATED INTELLIGENCE DEVELOPMENT DESIGN CAE MODEL UTILIZING NEW JIT: APPLICATION TO AUTOMOTIVE HIGH RELIABILITY ASSURANCE
Journal of Advanced Manufacturing Systems, 2008Co-Authors: Kakuro AmasakaAbstract:With a view to assisting corporations to survive in the “worldwide quality competi- tion”, the author has proposed the “Integrated Intelligence Development Design CAE Model” utilizing New JIT. This model consists of the “Total Quality Assurance (QA) High Cycle-ization Business Process System”, the “Stratified Intelligence CAE Man- agement System”, and the “Intelligence CAE Development Design Approarch System”. In an effort to verify the validity of this model, the author has analyzed an issue of worldwide concern, the Oil Seal leakage mechanism on an automobile transaxle with the cooperation of the Toyota and NOK, and has created the “Intelligence CAE Software-Oil Leakage Simulator” that incorporates CG Navigation in order to ensure “high reliability assurance of the automotive transaxle”.
R G Kirk - One of the best experts on this subject based on the ideXlab platform.
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Finite Element Thermohydrodynamic Analysis of Two-Lobe Oil Seals Used in High Pressure Centrifugal Compressors
Tribology Transactions, 1998Co-Authors: S. K. Baheti, R G KirkAbstract:This paper presents a finite element solution of the nonlinear and coupled hydrodynamic and thermal equations for pressure and temperature distributions in two-lobe Oil Seals. The pressure distribution is integrated to obtain hydrodynamic forces. The perturbation technique is used to determine the static and dynamic characteristics of the Oil Seal. Eigenvalue analysis is performed for the linear stability analysis of the compressor rotor. Results in terms of pressure and temperature distributions, stiffness and damping characteristics, leakage, growth factors and damped natural frequencies are presented for both cylindrical and two-lobe Oil Seals operating at different eccentricities. Presented at the 53rd Annual Meeting in Detroit, Michigan May 17–21, 1998
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Effect of Axially Grooved Oil Seals on the Leakage Flow and Stability of a Centrifugal Compressor
Tribology Transactions, 1996Co-Authors: S. K. Baheti, K. Ramesh, R G KirkAbstract:The results of an analytical investigation are given for the effect of axially grooved floating Oil ring Seals on the leakage flow and stability of a centrifugal gas compressor. The finite element method was used to solve the non-linear and coupled hydrodynamic and thermal equations for pressure and temperature distributions in the Oil Seal ring with and without the axial grooves. The peturbation technique was used to obtain the static and dynamic characteristics of the Oil Seal. The results for selected cases of axial grooving are presented in graphical form for operation at various eccentricities. The non-dimensional leakage flow results correlate well with previously published results calculated by narrow groove theory. The stability of a multi-stage gas compressor is evaluated for different configurations of the Oil Seal grooving geometry. The compressor rotor shaft finite element model includes a multi-level analysis for the Oil Seal rings that permits the evaluation of the floating Seal influence on...
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Effect of axially grooved Oil Seals on the leakage flow and stability of a centrifugal compressor
Tribology Transactions, 1996Co-Authors: S. K. Baheti, K. Ramesh, R G KirkAbstract:The results of an. analytical investigation are given for the effect of axially grooved floating Oil ring Seals on the leakage flow and stability of a centrifugal gas compressor. The finite element method was used to solve the non-linear and coupled hydrodynamic and thermal equations for pressure and temperature distributions in the Oil Seal ring with and without the axial grooves. The peturbation technique was used to obtain the static and dynamic characteristics of the Oil Seal. The results for selected cases of axial grooving are presented in graphical form for operation at various eccentricities. The non-dimensional leakage flow results correlate well with previously published results calculated by narrow groove theory. The stability of a multi-stage gas compressor is evaluated for different configurations of the Oil Seal grooving geometry. The compressor rotor shaft finite element model includes a multi-level analysis for the Oil Seal rings that permits the evaluation of the floating Seal influence on the total system stability. Results are given for both low and high-pressure Sealing conditions, which simulate test stand and field operating conditions. The results show that the added grooves enhance the stable operation of the rotor system for low pressure fixed Seal conditions and reduce the system stability at lower eccentricities for low-pressure floating Seal conditions. In high pressure conditions the added grooves enhance the stability of the system for both fixed and floating Seal conditions.
Mahmut Faruk Aksit - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of brush Seals for Oil Sealing applications
2012Co-Authors: Mahmut Faruk AksitAbstract:After proven performance in gas turbine secondary flow and hot gas path Sealing applications, brush Seals are being considered for Oil and Oil mist applications in aero-engines and industrial turbines. In Oil Sealing applications shear heating and Oil coking are major concerns. The field experience indicates that shear heating and Oil coking issues can be managed if Seal is designed properly. When Seal stiffness is well controlled, combined with proper fiber material selection and leakage cooling, shear heating and Oil coking issues can be managed. Field experience from early gas turbine bearing sump applications suggest reduced Oil mist ingestion and compressor blade fouling with no observable coking issues. Brush Seal operating clearance determines leakage rate and Oil temperature rise. Balancing these two conflicting performance criteria requires the knowledge of bristle hydrodynamic lift. In this work, some background on analytical solution to bristle lifting force and shear heating is presented. Based on short bearing approximation, the analytical solution suggests a strong dependence of Seal clearance and hydrodynamic lift force on Oil temperature and viscosity. The hydrodynamic lift force relation has been expanded to include Oil temperature variability due to rotor speed and lift clearance. Results are also compared with the experimental data obtained from the dynamic Oil Seal test rig.
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Flow and thermal analysis of Oil brush Seals, and investigation of shear heating phenomenon
2012Co-Authors: Mahmut Faruk Aksit, Ertuğrul Tolga DuranAbstract:Due to their superior performance and stable leakage characteristics, brush Seal is one of the emerging Seals to be used in Oil and Oil mist applications in aero-engines and turbines. The viscous medium between the high speed rotor surface and bearing surfaces formed by brush Seal bristles generates a hydrodynamic lifting force that determines Seal clearance and leakage rate in Oil Sealing applications. The analytical solution to bristle lifting force can be found by using Reynolds formulation. Following a short bearing approximation, a closed form solution of the lifting force has been previously presented. However, the solution suggests a strong dependence of hydrodynamic lift force and Seal clearance on Oil temperature and viscosity. This work presents an analytical solution to Oil temperature rise due to shear heating. The hydrodynamic lift force relation has been expanded to include Oil temperature variability due to rotor speed and lift clearance. Results are also compared with the experimental data obtained from the dynamic Oil Seal test rig.
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Effect of Shear Heat on Hydrodynamic Lift of Brush Seals in Oil Sealing
AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006Co-Authors: E Tolga Duran, Mahmut Faruk Aksit, Yahya DoguAbstract:Due to their superior performance and stable leakage characteristics, brush Seals are one of the dynamic Seals used in Oil and Oil mist applications in aero-engines and turbines. The viscous medium between the high speed rotor surface and bearing surfaces formed by brush Seal bristles generates a hydrodynamic lifting force that determines Seal clearance and leakage rate in Oil Sealing applications. The analytical solution to bristle lifting force can be found by using Reynolds formulation. Following a short bearing approximation, a closed form solution of the lifting force has been previously presented. However, the solution suggests a strong dependence of hydrodynamic lift force and Seal clearance on Oil temperature and viscosity. This work presents an analytical solution to Oil temperature rise due to shear heating. The hydrodynamic lift force relation has been expanded to include Oil temperature variability due to rotor speed and lift clearance. Results are also compared with the experimental data obtained from the dynamic Oil Seal test rig.
Yuki Yokokura - One of the best experts on this subject based on the ideXlab platform.
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Stick-Slip Suppression in Geared Motor Using Speed-Variant Transient Components of High-Order Motor-Side Normalization Compensator
2019 IEEE International Conference on Mechatronics (ICM), 2019Co-Authors: Juan Padron, Kiyoshi Ohishi, Yuki YokokuraAbstract:This paper proposes a stick-slip suppression method for a geared motor with Oil Seal. The method is based on speed-dependent variation of the transient components of the estimated frictional disturbance given by a high-order motor-side normalization compensator (MNC) using a differently-allocated poles switch type MNC (DAP-STMNC). It uses a decomposition technique to design the steady and transient characteristics of the high-order MNC separately, and uses a series of speed-dependent parameters to vary the transient characteristics online. The DAP-STMNC proved effective to suppress the stick-slip phenomenon while also suppressing oscillations on stick-slip transitions that arise due to overcompensation. The validity of the proposed method is proved through numerical simulations and experimental results.
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Suppression of Stick-Slip in an Oil-Seal-Mounted Geared Motor for Forward-Drivability Improvement
IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, 2019Co-Authors: Juan Padron, Kiyoshi Ohishi, Yuki Yokokura, Toshimasa MiyazakiAbstract:Good forward-drivability characteristics are essential for applications such as position, velocity, and force control. Geared motors, usually employed in industrial robots, require lubrication in their gears, and consequently, some form of Sealing is needed to avoid leaking. While Oil Seals prevent leaking, they increase nonlinear frictional effects, which result in stick-slip during velocity zero-crossings, thereby deteriorating the forward-drivability. This paper proposes a stick-slip suppression method based on a velocity-driven N-order stick compensator (VDNSC), which works as an order-variable friction compensator formed by the velocity-driven switching of the internal components of a high order Q-filter. Experiments with torque and velocity control confirm that the proposed method improves the forward-drivability, allowing for more precise motion even under large friction.
Juan Padron - One of the best experts on this subject based on the ideXlab platform.
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Stick-Slip Suppression in Geared Motor Using Speed-Variant Transient Components of High-Order Motor-Side Normalization Compensator
2019 IEEE International Conference on Mechatronics (ICM), 2019Co-Authors: Juan Padron, Kiyoshi Ohishi, Yuki YokokuraAbstract:This paper proposes a stick-slip suppression method for a geared motor with Oil Seal. The method is based on speed-dependent variation of the transient components of the estimated frictional disturbance given by a high-order motor-side normalization compensator (MNC) using a differently-allocated poles switch type MNC (DAP-STMNC). It uses a decomposition technique to design the steady and transient characteristics of the high-order MNC separately, and uses a series of speed-dependent parameters to vary the transient characteristics online. The DAP-STMNC proved effective to suppress the stick-slip phenomenon while also suppressing oscillations on stick-slip transitions that arise due to overcompensation. The validity of the proposed method is proved through numerical simulations and experimental results.
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Suppression of Stick-Slip in an Oil-Seal-Mounted Geared Motor for Forward-Drivability Improvement
IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society, 2019Co-Authors: Juan Padron, Kiyoshi Ohishi, Yuki Yokokura, Toshimasa MiyazakiAbstract:Good forward-drivability characteristics are essential for applications such as position, velocity, and force control. Geared motors, usually employed in industrial robots, require lubrication in their gears, and consequently, some form of Sealing is needed to avoid leaking. While Oil Seals prevent leaking, they increase nonlinear frictional effects, which result in stick-slip during velocity zero-crossings, thereby deteriorating the forward-drivability. This paper proposes a stick-slip suppression method based on a velocity-driven N-order stick compensator (VDNSC), which works as an order-variable friction compensator formed by the velocity-driven switching of the internal components of a high order Q-filter. Experiments with torque and velocity control confirm that the proposed method improves the forward-drivability, allowing for more precise motion even under large friction.
