Volume 1A: 38th Computers and Information in Engineering Conference最新文献_第2页

Test Frame Design for the Characterization of Additive Manufacturing Compliant Materials 增材制造柔性材料特性测试框架设计

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-85930

S. T. Fry, C. Turner

引用次数: 0

Metamorphic Mechanism and Reconfiguration of a Biomimetic Quadruped Robot 仿生四足机器人的变形机理与重构

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-85134

Zhao Tang, J. Dai

引用次数: 2

Open Uniaxial Test Machine (OpenUTM): Part 1 — A Low-Cost Electrohydraulic Test Frame for Additive Manufacturing Part Qualification 开放式单轴试验机(OpenUTM):第1部分-用于增材制造零件鉴定的低成本电液试验框架

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-86015

J. Steuben, A. Iliopoulos, J. Michopoulos

{"title":"Open Uniaxial Test Machine (OpenUTM): Part 1 — A Low-Cost Electrohydraulic Test Frame for Additive Manufacturing Part Qualification","authors":"J. Steuben, A. Iliopoulos, J. Michopoulos","doi":"10.1115/DETC2018-86015","DOIUrl":"https://doi.org/10.1115/DETC2018-86015","url":null,"abstract":"A wide variety of scientific and engineering activities require the use of testing machines in order to acquire data regarding the response of materials subjected to mechanical loads. This is particularly applicable to the domain of Additive Manufacturing (AM), where mechanical qualification is essential. Such machinery should be capable of applying loads at required levels and exhibit high mechanical stiffness. Accurate force, displacement, and strain measurements are also required. As a consequence, such testing machines are typically very costly. In the present paper we introduce the Open Uniaxial Test Machine (OpenUTM) project, aimed at providing a low-cost (less than $2500.00) material testing hardware/software framework. This paper will focus on the engineering design and hardware aspects of the OpenUTM project, with particular attention paid to the use of an electrohydraulic actuator (EHA) to provide test loads. A full bill of materials and drawings package is provided, in order to enable the use of the OpenUTM framework by research groups with minimal machine tooling. We introduce several case studies demonstrating the successful use of the OpenUTM frame in AM research efforts, including the testing and characterization of AM polymers and ceramics. We conclude with discussion of the software aspects of the OpenUTM framework, which will be elaborated upon in a follow-up paper (part two). We also present a series of potential avenues towards the improvement of the OpenUTM frame in future hardware iterations.","PeriodicalId":142043,"journal":{"name":"Volume 1A: 38th Computers and Information in Engineering Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115962265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Introducing a Projection-Based Method to Compare Three Approaches Computing the Accumulation of Geometric Variations 介绍了一种基于投影的方法，比较了计算几何变化累积的三种方法

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-85366

V. Delos, Santiago Arroyave-Tobón, D. Teissandier

{"title":"Introducing a Projection-Based Method to Compare Three Approaches Computing the Accumulation of Geometric Variations","authors":"V. Delos, Santiago Arroyave-Tobón, D. Teissandier","doi":"10.1115/DETC2018-85366","DOIUrl":"https://doi.org/10.1115/DETC2018-85366","url":null,"abstract":"In mechanical design, tolerance zones and contact gaps can be represented by sets of geometric constraints. For computing the accumulation of possible manufacturing defects, these sets have to be summed and/or intersected according to the assembly architecture. The advantage of this approach is its robustness for treating even over-constrained mechanisms i.e. mechanisms in which some degrees of freedom are suppressed in a redundant way. However, the sum of constraints, which must be computed when simulating the accumulation of defects in serial joints, is a very time-consuming operation. In this work, we compare three methods for summing sets of constraints using polyhedral objects. The difference between them lie in the way the degrees of freedom (DOFs) (or invariance) of joints and features are treated. The first method proposes to virtually limit the DOFs of the toleranced features and joints to turn the polyhedra into polytopes and avoid manipulating unbounded objects. Even though this approach enables to sum, it also introduces bounding or cap facets which increase the complexity of the operand sets. This complexity increases after each operation until becoming far too significant. The second method aims to face this problem by cleaning, after each sum, the calculated polytope to keep under control the effects of the propagation of the DOFs. The third method is new and based on the identification of the sub-space in which the projection of the operands are bounded sets. Calculating the sum in this sub-space allows reducing significantly the operands complexity and consequently the computational time. After presenting the geometric properties on which the approaches rely, we demonstrate them on an industrial case. Then we compare the computation times and deduce the equality of the results of all the methods.","PeriodicalId":142043,"journal":{"name":"Volume 1A: 38th Computers and Information in Engineering Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116945923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Toward a Generative Human-in-the-Loop Approach for Conceptual Design Exploration Using Flow Failure Frequency in Functional Models 在功能模型中使用流动失效频率进行概念设计探索的生成式人在环方法

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-85490

R. Arlitt, Douglas L. Van Bossuyt

{"title":"Toward a Generative Human-in-the-Loop Approach for Conceptual Design Exploration Using Flow Failure Frequency in Functional Models","authors":"R. Arlitt, Douglas L. Van Bossuyt","doi":"10.1115/DETC2018-85490","DOIUrl":"https://doi.org/10.1115/DETC2018-85490","url":null,"abstract":"A challenge systems engineers and designers face when applying system failure risk assessment methods such as Probabilistic Risk Assessment (PRA) during conceptual design is their reliance on historical data and behavioral models. This paper presents a framework for exploring a space of functional models using graph rewriting rules and a qualitative failure simulation framework that presents information in an intuitive manner for human-in-the-loop decision-making and human-guided design. An example is presented wherein a functional model of an electrical power system is iteratively perturbed to generate alternatives. The alternative functional models suggest different approaches to mitigating an emergent system failure vulnerability in the electrical power system’s the heat extraction capability. A preferred functional model configuration that has a desirable failure flow distribution can then be identified. The method presented here helps systems designers to better understand where failures propagate through systems and guides modification of systems functional models to adjust the way in which systems fail to have more desirable characteristics.","PeriodicalId":142043,"journal":{"name":"Volume 1A: 38th Computers and Information in Engineering Conference","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125072145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Trust Based Cyber-Physical Systems Network Design 基于信任的信息物理系统网络设计

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-86198

Yan Wang

引用次数: 2

A Statistical Approach to Ranking Similarities of Three Function Structure Groups Using Directed Graphs 用有向图对三个函数结构群相似性排序的统计方法

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-86090

Briana Lucero, M. J. Adams

{"title":"A Statistical Approach to Ranking Similarities of Three Function Structure Groups Using Directed Graphs","authors":"Briana Lucero, M. J. Adams","doi":"10.1115/DETC2018-86090","DOIUrl":"https://doi.org/10.1115/DETC2018-86090","url":null,"abstract":"Prior efforts in the study of engineering design employed various approaches to decompose product design. Design engineers use functional representation, and more precisely function structures, to define a product’s functionality. However, significant barriers remain to objectively quantifying the similarity between two function structures, even for the same product when developed by multiple designers. For function-structure databases this means that function-structures are implicitly categorized leaving the possibility of incorrect categorization and reducing efficacy of returned analogous correlations. Improvements to efficacy in database organization and queries are possible by objectively quantifying the similarity between function structures.\u0000 The proposed method exploits fundamental properties of function-structures and design taxonomies. We convert function-structures into directed graphs (digraphs) and equivalent adjacency matrices. The conversion maintains the directed (function → flow → function) progression inherent to function-structures and enables the transformation of the function-structure into a standardized graph. For design taxonomies (e.g. D-APPS), graph nodes represent flows in a consistent (but arbitrary) ordering. By exploiting the directional properties of function-structures and defining the flows as the graphical nodes, the objective and standardized comparison of two function-structures becomes feasible. We statistically quantify the association between digraphs using the Pearson Product Moment Correlation (PPMC) for both within-group and between-group comparisons. The method was tested on three product types (ball thrower, food processor, and an ice cream maker) with function-structures defined by various designers. The method suggested herein is provided as a proof-of-concept with suggested verification and validation approaches for further development.","PeriodicalId":142043,"journal":{"name":"Volume 1A: 38th Computers and Information in Engineering Conference","volume":"22 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120839807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Five Axis Swept Profiles of Torus Like Cutters via Separation of Inner and Outer Characteristic Curves 内外特性曲线分离的环面刀具五轴掠型

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-85619

E. Aras

{"title":"Five Axis Swept Profiles of Torus Like Cutters via Separation of Inner and Outer Characteristic Curves","authors":"E. Aras","doi":"10.1115/DETC2018-85619","DOIUrl":"https://doi.org/10.1115/DETC2018-85619","url":null,"abstract":"A broadly applicable formulation for identifying the swept profiles (SWP) generated by subsets of a toroidal surface is presented. While the problem of locating the entire SWP of a torus has been extensively addressed in the literature, this rarely addressed problem is of significance to NC machining with non-standard shape of milling tools. A torus, generated by revolving a circle about an axis coplanar with the circle, is made up of inner and outer parts of a tube. The common use of the torus is in a fillet-end mill which contains only the fourth quadrant of a cross section of the tube. However, in the industrial applications the different regions of the torus geometry appear. Especially we can see this on the profile cutters, such as the corner-rounding and concave-radius end mills. Also to the best of our knowledge, the interior of the torus-tube is either neglected or represented by B-spline curves in literature. In case of common milling tool surfaces such as sphere, cylinder and frustum there exists only one SWP in any instance of a tool movement. But, in case of the toroidal surface there exist two sophisticated SWPs and we need to consider only one of them in tool swept envelope generation. Therefore, considering the complexity of five-axis tool motions there is a need not only to distinguish the front from the rear of the cutter but also the exterior from the interior of a tube. This paper presents a methodology and algorithms for analytically formulating the SWP of any sub-set of the torus in five-axis tool motions. By introducing the rigid body motion theory, two moving frames along with a fixed frame are defined. Arbitrary poses of a tool between tool path locations are interpolated by a spherical linear interpolation (slerp) whose effect is a rotation with uniform angular velocity around a fixed rotation axis. For the problem of NC simulation, by using the envelope theory the closed-form solutions of swept profiles are formulated as two-unit vector functions.","PeriodicalId":142043,"journal":{"name":"Volume 1A: 38th Computers and Information in Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122064668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Assembly Information Model for Rapid Assembly Modeling 面向快速装配建模的装配信息模型

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-85427

Zhuo Lv, Xu Zhang, Haoqi Wang, Wei Ming

引用次数: 1

Differential Performance Signature Qualification for Additively Manufactured Parts 增材制造零件的差异性能签名鉴定

Volume 1A: 38th Computers and Information in Engineering Conference Pub Date : 2018-08-26 DOI: 10.1115/DETC2018-85985

J. Michopoulos, J. Steuben, A. Iliopoulos

{"title":"Differential Performance Signature Qualification for Additively Manufactured Parts","authors":"J. Michopoulos, J. Steuben, A. Iliopoulos","doi":"10.1115/DETC2018-85985","DOIUrl":"https://doi.org/10.1115/DETC2018-85985","url":null,"abstract":"Additive Manufacturing (AM) technologies and associated processes, enable successive accretion of material to a domain, and permit manufacturing of highly complex objects which would otherwise be unrealizable. However, the material micro- and meso-structures generated by AM processes can differ remarkably from those arising from conventional manufacturing (CM) methods. Often, a consequence of this fact is the sub-standard functional performance of the produced parts that can limit the use of AM in some applications. In the present work, we propose a rapid functional qualification methodology for AM-produced parts based on a concept defined as differential Performance Signature Qualification (dPSQ). The concept of Performance Signature (PerSig) is introduced both as a vector of featured quantities of interest (QoIs), and a graphical representation in the form of radar or spider graph, representing the QoIs associated with the performance of relevant parts. The PerSigs are defined for both the prequalified CM parts and the AM-produced ones. Comparison measures are defined and enable the construction of differential PerSigs (dPerSig) in a manner that captures the differential performance of the AM part vs. the prequalified CM one. The dPerSigs enable AM part qualification based on how their PerSigs are different from those of prequalified CM parts. After defining the steps of the proposed methodology, we describe its application on a part of an aircraft landing gear assembly and demonstrate its feasibility.","PeriodicalId":142043,"journal":{"name":"Volume 1A: 38th Computers and Information in Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129604588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1