The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Jiro Hiramoto - One of the best experts on this subject based on the ideXlab platform.
-
A Study of Topology Optimization for Joint Locations of Automotive Full Vehicle
Advances in Structural and Multidisciplinary Optimization, 2017Co-Authors: Saito Takanobu, Yoshikiyo Tamai, Jiro HiramotoAbstract:The optimization method for searching the joint locations of spot-welding and adhesives in a automotive body made of steel sheets was studied [1]. The key point is that the topology optimization method was applied to the optimization of joint elements by using a full vehicle model in order to improve vehicle performance. In addition to static stiffness using constraints, stiffness while driving is required in the body stiffness of the full vehicle. Inertia Relief is known as a method for expression of behavior while driving.
Ching-hung Chuang - One of the best experts on this subject based on the ideXlab platform.
-
Topology optimization with additive manufacturing consideration for vehicle load path development
International Journal for Numerical Methods in Engineering, 2017Co-Authors: Ching-hung Chuang, Ren-jye Yang, Shikui Chen, Panagiotis VogiatzisAbstract:Summary Topology optimization has been widely studied and implemented as a powerful conceptual design tool in various engineering applications. However, the result from topology optimization has posed an implementation challenge to engineers because of the complexity of converting obtained solution into computer-aided design data and then fabricating it into real parts. Over the past few years, the advanced additive manufacturing technology with new materials and higher resolution output capabilities has opened numerous opportunities to fill the gap between topology optimization and product application. In this study, an engineering procedure is presented for the conversion of topology optimization result to ready-to-print model for additive manufacturing. The steps of post-optimization handling are outlined, and the potential practical issues for the additive manufacturing implementation are discussed. A vehicle example for full frontal impact load path development by topology optimization with Inertia Relief approach is used to exhibit the employed additive manufacturing implementation process with a reduced-scale part build. The arising implementation issues and needs are examined for future advance of topology optimization and additive manufacturing integration development. Copyright © 2017 John Wiley & Sons, Ltd.
-
Application of regional strain energy in topology optimization with Inertia Relief analysis
Volume 3A: 39th Design Automation Conference, 2013Co-Authors: Wei Song, Hae Chang Gea, Ren-jye Yang, Ching-hung ChuangAbstract:In finite element analysis, Inertia Relief solves the response of an unconstrained structure subject to constant or slowly varying external loads with static analysis computational cost. It is very attractive to utilize it in topology optimization to design structures under unbalanced loads, such as in impact and drop phenomena. In this paper, regional strain energy formulation and Inertia Relief is integrated into topology optimization to design protective structure under unbalanced loads. For background, the equations of Inertia Relief are introduced and a commonly used solving method is revisited. Then the regional strain energy formulation for topology optimization with Inertia Relief is proposed and its sensitivity is derived from the adjoint method. Based on the solving method, the sensitivity is evaluated term by term to simplify the results. The simplified sensitivity can be calculated easily using the output of commercial finite element packages. Finally, the effectiveness of this formulation is shown in the first example and the proposed regional strain energy formulation for topology optimization with Inertia Relief are presented and discussed in the protective structure design examples.Copyright © 2013 by ASME
Carl-johan Thore - One of the best experts on this subject based on the ideXlab platform.
-
Topology optimization of freely floating elastic continua using the Inertia Relief method
Computer Methods in Applied Mechanics and Engineering, 2020Co-Authors: Carl-johan ThoreAbstract:Abstract In many applications, it is of interest to perform static finite element analyses on freely floating bodies that are not in quasi-static equilibrium; airplanes and helicopters maneuvering in flight for example. This is particularly so if topology optimization (TO) is to be used, since TO with dynamic analyses can be very computationally expensive. The so-called Inertia Relief method, which essentially entails computing the rigid body Inertia and subtracting it from the given loads to make the system of loads self-equilibrating, can sometimes be used to replace a dynamic analysis with a static, thus enabling the use of high-resolution TO. We derive the Inertia Relief method for elastic continua and obtain a static variational problem which require that we can suppress (linearized) rigid body motions without affecting the deformation. Three methods for doing this are investigated. Based on the static variational problem we consider maximizing stiffness using TO. Numerical examples show that all three methods for suppressing rigid body motion work, and indicate that optimal designs for freely floating structures undergoing rigid acceleration can differ significantly from designs optimized under static conditions.
Panagiotis Vogiatzis - One of the best experts on this subject based on the ideXlab platform.
-
Topology optimization with additive manufacturing consideration for vehicle load path development
International Journal for Numerical Methods in Engineering, 2017Co-Authors: Ching-hung Chuang, Ren-jye Yang, Shikui Chen, Panagiotis VogiatzisAbstract:Summary Topology optimization has been widely studied and implemented as a powerful conceptual design tool in various engineering applications. However, the result from topology optimization has posed an implementation challenge to engineers because of the complexity of converting obtained solution into computer-aided design data and then fabricating it into real parts. Over the past few years, the advanced additive manufacturing technology with new materials and higher resolution output capabilities has opened numerous opportunities to fill the gap between topology optimization and product application. In this study, an engineering procedure is presented for the conversion of topology optimization result to ready-to-print model for additive manufacturing. The steps of post-optimization handling are outlined, and the potential practical issues for the additive manufacturing implementation are discussed. A vehicle example for full frontal impact load path development by topology optimization with Inertia Relief approach is used to exhibit the employed additive manufacturing implementation process with a reduced-scale part build. The arising implementation issues and needs are examined for future advance of topology optimization and additive manufacturing integration development. Copyright © 2017 John Wiley & Sons, Ltd.
Saito Takanobu - One of the best experts on this subject based on the ideXlab platform.
-
A Study of Topology Optimization for Joint Locations of Automotive Full Vehicle
Advances in Structural and Multidisciplinary Optimization, 2017Co-Authors: Saito Takanobu, Yoshikiyo Tamai, Jiro HiramotoAbstract:The optimization method for searching the joint locations of spot-welding and adhesives in a automotive body made of steel sheets was studied [1]. The key point is that the topology optimization method was applied to the optimization of joint elements by using a full vehicle model in order to improve vehicle performance. In addition to static stiffness using constraints, stiffness while driving is required in the body stiffness of the full vehicle. Inertia Relief is known as a method for expression of behavior while driving.