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research-article  
Shumiao Wang, Siddharth Bhandari, Siva Chaitanya Chaduvula, Mikhail Atallah, Jitesh H. Panchal and Karthik Ramani
J. Comput. Inf. Sci. Eng   doi: 10.1115/1.4036615
The goal in this paper is to enable collaboration in the co-design of engineering artifacts when participants are reluctant to share their design-related confidential and proprietary information with other co-designers, even though such information is needed to analyze and validate the overall design. We demonstrate the viability of co-design by multiple entities who view the parameters of their contributions to the joint design to be confidential. In addition to satisfying this confidentiality requirement, an online co-design process must result in a design that is of the same quality as if full sharing of information had taken place between the co-designers. We present online co-design protocols that satisfy both requirements, and demonstrate their practicality using a simple example of co-design of an automotive suspension system and the tires. Our protocols do not use any cryptographic primitives -- they only use the kinds of mathematical operations that are currently used in single-designer situations. The participants in the online design protocols include the co-designers, and a cloud server that facilitates the process while learning nothing about the participants' confidential information or about the characteristics of the co-designed system. The only assumption made about this cloud server is that it does not collude with some participants against other participants.
TOPICS: Design, Engineering systems and industry applications, Collaboration, Suspension systems, Tires
research-article  
Zahra Shahbazi, Devon Keane, Domenick Avanzi and Lance Evans
J. Comput. Inf. Sci. Eng   doi: 10.1115/1.4036556
Finite Element Analysis (FEA) has been one of the successful tools in studying mechanical behavior of biological materials. There are many instances where creating FE models requires extensive time and effort. Such instances include finite element analysis of tree branches with complex geometries and varying mechanical properties. Once a FE model of a tree branch is created, the model is not applicable to another branch and all the modeling steps must be repeated for each new branch with a different geometry and, in some cases, material. In this paper, we describe a new and novel program “Immediate-TREE”, and its associated Guided User Interface (GUI). This program provides researchers a fast and efficient tool to create finite element analysis of a large variety of tree branches. Immediate-TREE automates creating finite element models with the use of computer generated Python files. Immediate-TREE uses tree branch data (geometry, mechanical and material properties) and generates Python files. Files were then run in finite element analysis software (Abaqus) to complete the analysis. Immediate-TREE is approximately 240 times faster than creating the same model directly in the FEA software (Abaqus). This new process can be used with a large variety of biological applications including analyses of bones, teeth as well as none biological materials.
TOPICS: Finite element analysis, Finite element model, Geometry, Computer software, Materials properties, Mechanical properties, Bone, User interfaces, Graphical user interfaces, Mechanical behavior, Modeling, Computers
research-article  
Santiago Arroyave-Tobon, Denis Teissandier and Vincent Delos
J. Comput. Inf. Sci. Eng   doi: 10.1115/1.4036558
This article proposes the use of polytopes in HV-description to solve tolerance analysis problems. Polytopes are defined by a finite set of half-spaces representing geometric, contact or functional specifications. However, the list of the vertices of the polytopes are useful for computing other operations as Minkowski sums. Then, this paper proposes a truncation algorithm to obtain the V-description of polytopes in R^n from its H-description. It is detailed how intersections of polytopes can be calculated by means of the truncation algorithm. Minkowski sums as well can be computed using this algorithm making use of the duality property of polytopes. Therefore, a Minkowski sum can be calculated intersecting some half-spaces in the dual space. Finally, the approach based on HV-polytopes is illustrated by the tolerance analysis of a real industrial case using the open source software PolitoCAT and politopix.
TOPICS: Tolerance analysis, Vickers hardness testing, Algorithms, Space, Computer software

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