Robust design approach for flexible pavements to minimize the influence of material property uncertainty

2019 ◽  
Vol 225 ◽  
pp. 332-339 ◽  
Author(s):  
Zhe Luo ◽  
Biao Hu ◽  
Ernian Pan
Keyword(s):  
Robust Design ◽  
Material Property ◽  
Flexible Pavements ◽  
Design Approach

Influence of deposition parameters on structural, morphological and optical properties of ZnO films using robust design approach

2015 ◽  
Vol 6 (2/3) ◽  
pp. 154 ◽  
Author(s):  
B.W. Shivaraj ◽  
H.N. Narasimha Murthy ◽  
M. Krishna ◽  
B.M. Nagabhushana ◽  
Sushanth D. Shandilya ◽  
...  
Keyword(s):  
Optical Properties ◽  
Robust Design ◽  
Design Approach ◽  
Zno Films ◽  
Deposition Parameters

The Problem of Size in Robust Design

1997 ◽  
Author(s):  
Patrick N. Koch ◽  
Janet K. Allen ◽  
Farrokh Mistree ◽  
Dimitri Mavris
Keyword(s):  
Robust Design ◽  
High Speed ◽  
Model Building ◽  
Parametric Design ◽  
Design Approach ◽  
Preliminary Design ◽  
Fast Analysis ◽  
Large Complex ◽  
Complex Design ◽  
Large Complex System

Abstract To facilitate the effective solution of multidisciplinary, multiobjective complex design problems, a departure from the traditional parametric design analysis and single objective optimization approaches is necessary in the preliminary stages of design. A necessary tradeoff becomes one of efficiency vs. accuracy as approximate models are sought to allow fast analysis and effective exploration of a preliminary design space. In this paper we apply a general robust design approach for efficient and comprehensive preliminary design to a large complex system: a high speed civil transport (HSCT) aircraft. Specifically, we investigate the HSCT wing configuration design, incorporating life cycle economic uncertainties to identify economically robust solutions. The approach is built on the foundation of statistical experimentation and modeling techniques and robust design principles, and is specialized through incorporation of the compromise Decision Support Problem for multiobjective design. For large problems however, as in the HSCT example, this robust design approach developed for efficient and comprehensive design breaks down with the problem of size — combinatorial explosion in experimentation and model building with number of variables — and both efficiency and accuracy are sacrificed. Our focus in this paper is on identifying and discussing the implications and open issues associated with the problem of size for the preliminary design of large complex systems.

Wheelchair Rugby chair configurations: an individual, Robust design approach

2019 ◽  
pp. 1-16 ◽  
Author(s):  
David S. Haydon ◽  
Ross A. Pinder ◽  
Paul N. Grimshaw ◽  
William S. P. Robertson
Keyword(s):  
Robust Design ◽  
Design Approach ◽  
Wheelchair Rugby

Reliability-Based Robust Design for Mechanical Components under Small-Sample Information

2012 ◽  
Vol 215-216 ◽  
pp. 804-807
Author(s):  
Xiang Dong He ◽  
Jia Peng Chu
Keyword(s):  
Robust Design ◽  
Design Method ◽  
Small Sample ◽  
Design Approach ◽  
High Confidence ◽  
Mechanical Parts ◽  
Estimate Reliability ◽  
Practical Engineering ◽  
Definition Of ◽  
Robust Design Method

In engineering design, according to not considering past experience information; hence, to make structure parameters for achieving high confidence level, much data for traditional reliability-based robust design must be adequately collected, analyzed, and tested. However, in practical engineering, it is very difficult for doing much test, only for getting in the form of finite test samples. Under the conditions, it has much difficult for the traditional reliability-based robust design. In the article, we present a new reliability-based robust design method that solves the form of incomplete information. The method adopts a Bayesian inference technique to estimate reliability, gives definition of Bayesian reliability. In the research, the mechanical parts bayesian reliability-based robust design mathematical model is established and the bayesian reliability-based robust design approach is presented. The numerical results illustrates the method presented is an efficient and practical reliability-based robust design approach.

A geometric accuracy analysis and tolerance robust design approach for a vertical machining center based on the reliability theory

Measurement ◽  
2020 ◽  
Vol 161 ◽  
pp. 107809 ◽  
Author(s):  
Haorong Wu ◽  
Hualin Zheng ◽  
Xiaoxiao Li ◽  
Wenkuan Wang ◽  
Xiping Xiang ◽  
...  
Keyword(s):  
Robust Design ◽  
Reliability Theory ◽  
Design Approach ◽  
Accuracy Analysis ◽  
Geometric Accuracy ◽  
Machining Center

Robust Design of Flexure Based Nano Precision Compliant Mechanisms With Application to Nano Imprint Lithography

2008 ◽  
Author(s):  
Chinmaya B. Patil ◽  
S. V. Sreenivasan ◽  
Raul G. Longoria
Keyword(s):  
Analytical Model ◽  
Robust Design ◽  
Compliant Mechanisms ◽  
Design Approach ◽  
Iteration Step ◽  
Geometric Errors ◽  
Imprint Lithography ◽  
Flexure Mechanism ◽  
Parasitic Motion ◽  
Nano Imprint

Flexure-based compliant mechanisms are the preferred motion guiding systems for small range, nano-precision positioning applications because of excellent characteristics like friction-free continuous motion. These mechanisms are commonly used in nano fabrication equipment and ultra precision instruments. However, machining imperfections induced geometric errors in the mechanisms are known to cause undesirable parasitic motion and significant loss of precision. A systematic design approach to minimize the sensitivity of the flexure mechanisms to geometric errors induced by machining tolerances is presented here. Central to the design approach is the screw systems based analytical model to study the spatial motion characteristics of flexure mechanisms. Using this model, the parasitic motion is classified into those errors which can be corrected by calibration (extrinsic) and those which are coupled with the mechanism motion and cannot be corrected by apriori calibration (intrinsic). Metric to quantify the intrinsic parasitic motion results naturally from the screw systems analysis, and is used to represent the precision capability of the flexure mechanism. The analytical model enables the selection of geometric parameters of flexure joints of the mechanism via an optimization scheme with the aim of minimizing the parasitic motion metric. The statistical nature of the machining tolerances is accounted for by sampling the random variables at every iteration step of the optimization, leading to a stochastic formulation. The robust design approach is illustrated using a one DOF rotational flexure mechanism that is used in nano-imprint lithography equipment. Numerical results of the optimization indicate up to 40% improvement in the precision capability of the mechanism without any change in the manufacturing tolerance limits. Further, it is shown via eigenscrew analysis of mechanism compliance that the robustness resulting from the optimal flexure joint design can be attributed to the improved compliance distribution.

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