AW Engineering Co.

Japan

AW Engineering Co.

Japan

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Ide T.,Aisin Seiki | Kitajima H.,Aw Engineering Co. | Leiva J.,Vanderplaats R and D | Watson B.,Vanderplaats R and D
SAE Technical Papers | Year: 2012

A design process to reduce mass and sound pressure for automatic transmissions of vehicles is presented. The proposed process uses a newly developed topography optimization technique. Additionally, useful and necessary techniques including sound pressure optimization and the beta method are described. As a demonstrative problem, the design process is successfully applied to reduce mass and sound pressure of a 6 speed AISIN AW FWD automatic transmission. Copyright © 2012 SAE International.


Shao C.,AW Engineering Co. | Iinuma T.,AW Engineering Co.
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | Year: 2012

The conventional Galerkin finite element solution is mesh dependent, and its discretization for Poisson's equation can not satisfy the conservation law at a nodal level when unstructured linear meshes are used. This research tries to solve these problems by introducing a new concept of the virtual nodal domain(Vnd) for a linear hexahedral element, and distributing the source term to a nodal algebraic equation in proportion to the volume of the Vnd. The Vnd is evaluated using a second-order flux existing within a linear element. We proved that the total Vnd of the eight nodes equals to the volume of the element, which guarantees that our scheme is also elementally conservative. Numerical simulation of heat conduction with both Dirichlet and Neumann boundary conditions shows that the accuracy has been improved obviously comparing with the conventional Galerkin FEM for unstructured hexahedral meshes, especially for bad quality elements. Our scheme can be introduced into any commercial FEM code quite easily. © 2012 The Japan Society of Mechanical Engineers.


Shao C.,AW Engineering Co. | Iinuma T.,AW Engineering Co.
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | Year: 2012

The conventional Galerkin finite element solution is mesh-dependent and sometimes can not converge on the original Poisson's equation locally when a unstructured linear mesh is used. We try to solve these two problems by introducing a new concept of the virtual nodal domain(Vnd) for a linear tetrahedral element and distributing the source term to a nodal algebraic equation in proportion to the Vnd. The Vnd is evaluated from the conservation law using a second-order flux. We have proved theoretically that the total Vnd belong to the four nodes equals to the volume of the element. Numerical simulation of heat conduction with both Dirichlet and Neumann boundary conditions shows that the accuracy has been improved obviously comparing with the conventional Galerkin FEM for unstructured tetrahedral meshes, especially for bad quality elements. © 2012 The Japan Society of Mechanical Engineers.


Shao C.,AW Engineering Co. | Iinuma T.,AW Engineering Co.
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B | Year: 2011

The conventional Galerkin finite element solution is mesh-dependent, and its discretization for Poisson's equation can not satisfy the conservation law over a nodal domain when unstructured linear meshes are used. This research tries to solve these problems by introducing a new concept of the virtual nodal domain(Vnd) for a linear quadrilateral element, and distributing the source term to a nodal algebraic equation in proportion to the area of the Vnd. The Vnd is evaluated using a second-order flux existing within a linear element. We proofed that the total Vnd of the four nodes equals to the area of the element, which guarantees that our scheme is also elementally conservative. Numerical simulation of heat conduction with both Dirichlet and Neumann boundary conditions shows that the accuracy has been improved obviously comparing with the conventional Galerkin FEM for unstructured quadrilateral meshes, especially for bad quality elements. Our scheme can be introduced into any commercial FEM code quite easily. © 2011 The Japan Society of Mechanical Engineers.


Ide T.,Aisin Seiki | Kitajima H.,AW ENGINEERING CO. | Otomori M.,Aisin Seiki | Leiva J.P.,Vanderplaats Research & Development Inc. | Watson B.C.,Vanderplaats Research & Development Inc.
Structural and Multidisciplinary Optimization | Year: 2016

In this paper, we consider lightweight design methods for gear box of automatic transmission of vehicles with contact constraints. Lightweight design is a fundamental requirement for protecting the environment and improving fuel economy. In addition, durability is another important requirement for safe driving. However, in the design of automatic transmissions, these two requirements are usually in a trade-off relationship and engineers spend a long design study time. This paper deals with design approaches using structural optimization method to design lightweight structures and to minimize stress with contact constraints. Stress with contact constraints is solved using the finite element method. Three different structural optimization methods, topometry, topography and freeform optimization, are applied for the design of a lightweight gear box of an automatic transmission. The optimization results show that the optimization methods successfully found the lightweight gear box design and can be used at the early stage of the design process of automatic transmissions. © 2015 Springer-Verlag Berlin Heidelberg


Suzuki T.,AW Engineering Co. | Mani T.,AW Engineering Co. | Tsuchida K.,Aisin Seiki | Yamaguchi M.,Aisin Seiki
SAE International Journal of Passenger Cars - Mechanical Systems | Year: 2016

The method that enables a Simulink model to execute parallel computation by using GPGPU technology is introduced. The GPGPU, General-purpose computing on graphics processing units, is a technology to accelerate program by using graphic card instead of CPU computation. This method was developed to reduce the time to detect failure mode of automatic transmission’s valve body. The valve body is the major part of automatic transmission. It is extremely important to confirm the functional safety of automatic transmission in the case that any parts of valve body failed. We have developed Simulink-based valve body failure mode simulator, and made a considerable contribution for this work. However, the number of failure mode is increasing recently. Therefore, we made the simulator to compute at a high-speed using GPGPU technology. We have sharply reduced the computation time and strengthened the computing ability to support the detection for an increasing amount of failure modes. In addition, we have automated almost a whole detection process and have made the simulator easier to use and scalable from now. Copyright © 2016 SAE International.


Kitajima H.,AW Engineering Co. | Ide T.,Aisin Seiki | Leiva J.,Vanderplaats RandD | Watson B.,Vanderplaats RandD | Lankalapalli S.,Vanderplaats RandD
SAE Technical Papers | Year: 2014

A design process to improve the structural performance under contact conditions of automatic transmission of vehicles is presented. The proposed process uses newly developed nonlinear contact optimization techniques. Additionally, useful structural optimization techniques such as 3D topography and the beta method are described. As a demonstrative problem, we consider the improvement of a 6- speed AISIN FWD automatic transmission which is subjected to static loadings and nonlinear contact conditions. Copyright © 2014 SAE International.


Yamaguchi T.,Aisin Seiki | Okumura A.,AW Engineering Co.
ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011 | Year: 2011

The performance of a torque converter has been one of the most important areas of improvement for an automatic-transmission equipped automobile. Improving the torque converter's performance and efficiency is key to saving fuel consumption, which is an important consideration with recent environmental awareness. Moreover, improving the overall automobile performance has led to more compact and lightweight transmissions. With the growing space constraints, the evolution of the torque converter has been towards smaller and more elliptical shapes. Since the smaller blades within the torque converter still have to endure the same engine torque, more strength is required of each blade of the pump, the turbine and the stator. There has been much research carried out to predict hydrodynamic performance and to understand the flow field inside a torque converter either experimentally or analytically using Computational Fluid Dynamics (CFD). However, none of the research has focused on the strength of the torque converter components - the blade, the shell and the core. The previous method for evaluating the blade strength had been to apply a simple, centrifugal pressure load on the blade using Finite Element Analysis (FEA). This method is no longer adequate for predicting blade stress since the pressure distribution on the blade is now known from CFD results. In this work, the fluid-structure interaction (FSI) technique is used to determine the deformation, which is indicative of the stress level of the blade, the shell and the core. In addition, this research compares the computational results from a model containing all blades to a conventional model of a single blade with axial symmetry. Analysis of the model containing all blades shows a completely different deformation mode than the single-blade model, especially for the pump blade. The differing results suggest that using a single-blade model analysis is less accurate for examining the torque converter structure. Copyright © 2011 by ASME.

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