Estimating Stress Bounds in Early-Stage Design of Distributed Compliant Mechanisms

2016 ◽  
Author(s):  
Sreekalyan Patiballa ◽  
John Francis Shanley ◽  
Girish Krishnan
Keyword(s):  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Early Stage ◽  
Functional Characterization ◽  
Stress Constraints ◽  
Design Stage ◽  
Synthesis Process ◽  
Early Design Stage ◽  
Computationally Intensive ◽  
Early Stage Design

Synthesis of distributed compliant mechanisms is often a two-stage process involving (a) conceptual topology synthesis, and a subsequent (b) refinement stage to meet stress and manufacturing specifications. The usefulness of a solution is ascertained only after the sequential completion of these two steps, which are in general computationally intensive. This paper presents a strategy to rapidly estimate final operating stresses even before the actual refinement process. This strategy is based on the uniform stress distribution metric, and a functional characterization of the different members that constitute the compliant mechanism topology. It enables selecting the best conceptual solution for further optimization, thus maximally avoiding refinement of topologies that inherently may not meet the stress constraints. Furthermore this strategy enables modifying topologies at the early design stage to meet final stress specifications, thus greatly accelerating the overall synthesis process.

Estimating Optimized Stress Bounds in Early Stage Design of Compliant Mechanisms

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Sree Kalyan Patiballa ◽  
Girish Krishnan
Keyword(s):  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Early Stage ◽  
Functional Characterization ◽  
Stress Constraints ◽  
Design Synthesis ◽  
Stage Design ◽  
Computationally Intensive ◽  
Early Stage Design ◽  
Selection Of

Design synthesis of distributed compliant mechanisms is often a two-stage process involving (a) conceptual topology synthesis and a subsequent (b) refinement stage to meet strength and manufacturing specifications. The usefulness of a solution is ascertained only after the sequential completion of these two steps that are, in general, computationally intensive. This paper presents a strategy to rapidly estimate final operating stresses even before the actual refinement process. This strategy is based on the uniform stress distribution metric, and a functional characterization of the different members that constitute the compliant mechanism topology. Furthermore, this paper uses the underlying mechanics of stress bound estimation to propose two rule of thumb guidelines for insightful selection of topologies and systematically modifying them for an application. The selection of the best conceptual solution in the early stage design avoids refinement of topologies that inherently may not meet the stress constraints. This paper presents two examples that illustrate these guidelines through the selection and refinement of topologies for a planar compliant gripper application.

scholarly journals Facade Style Mixing using Artificial Intelligence for Urban Infill

2021 ◽  
Author(s):  
AHMED KHAIRADEEN ALI ◽  
One Jae Lee
Keyword(s):  
Artificial Intelligence ◽  
Architectural Design ◽  
Early Stage ◽  
Building Design ◽  
Digital Design ◽  
Design Stage ◽  
Generative Adversarial Network ◽  
Early Design ◽  
Early Design Stage ◽  
Early Stage Design

Artificial Intelligence and especially machine learning have noticed rapid advancement on image processing operations. However, its involvement in the architectural design is still in its initial stages compared to other disciplines. Therefore, this paper addresses the issues of developing an integrated bottom up digital design approach and details a research framework for the incorporation of Deep Convolutional Generative Adversarial Network (GAN) for early stage design exploration and generation of intricate and complex alternative facade designs for urban infill. This paper proposes a novel building facade design by merging two neighboring building’s architecture style, size, scale, openings, as reference to create a new building design in the same neighborhood for urban infill. This newly produced building contains the outline, style and shape of the parent buildings. A 2D urban infill building design is generated as a picture where 1) neighboring buildings are imported as a reference using mobile phone and 2)iFACADE decode their spatial adjacency. It is depicted the iFACADE will be useful for designers in the early design stage to generate new façades depending on existing buildings in a short time that will save time and energy. Besides, building owners can use iFACADE to show their architects their preferred architecture facade by mixing two building styles and generating a new building. Therefore, it is depicted that iFACADE can become a communication platform in the early design stages between architects and owners. Initial results properly define a heuristic function for generating abstract design facade elements and sufficiently illustrate the desired functionality of our developed prototype.

Resilience Allocation for Early Stage Design of Complex Engineered Systems

2016 ◽  
Vol 138 (9) ◽  
Author(s):  
Nita Yodo ◽  
Pingfeng Wang
Keyword(s):  
Distribution System ◽  
Failure Modes ◽  
Early Stage ◽  
Design Stage ◽  
Early Design ◽  
Early Design Stage ◽  
Complex Engineered Systems ◽  
Operating Environments ◽  
Early Stage Design ◽  
Critical Components

The continuous pursuits of developing a better, safer, and more sustainable system have pushed systems to grow in complexity. As complexity increases, challenges consequently arise for system designers in the early design stage to take account of all potential failure modes in order to avoid future catastrophic failures. This paper presents a resilience allocation framework for resilience analysis in the early design stage of complex engineering systems. Resilience engineering is a proactive engineering discipline that focuses on ensuring the performance success of a system by adapting to changes and recovering from failures under uncertain operating environments. Utilizing the Bayesian network (BN) approach, the resilience of a system could be analyzed and measured quantitatively in a probabilistic manner. In order to ensure that the resilience of a complex system satisfies the target resilience level, it is essential to identify critical components that play a key role in shaping the top-level system resilience. Through proper allocation of resilience attributes to these critical components, not only target could resilience requirements be fulfilled, global cascading catastrophic failure effects could also be minimized. An electrical distribution system case study was used to demonstrate the developed approach, which can also be used as a fundamental methodology to quantitatively evaluate resilience of engineered complex systems.

Evaluation of Conceptual Designs and Maintainability Incorporating Uncertainty

2002 ◽  
Author(s):  
D. Kalenchuk ◽  
P. Gu
Keyword(s):  
Evaluation System ◽  
Product Life Cycle ◽  
Early Stage ◽  
Design Method ◽  
Cycle Performance ◽  
Design Stage ◽  
Design Solution ◽  
Early Design Stage ◽  
Design Concepts ◽  
Early Stage Design

This paper presents a method for carrying out a quantitative evaluation of design concepts with incomplete assessment information. When evaluating design solutions, in addition to consideration of product functionality, quality and cost, product life cycle performance such as maintainability should also be evaluated. Product maintainability issues are one of the more difficult design aspects to evaluate in early design stage. This paper describes specific maintainability metrics for evaluating product maintenance of conceptual design alternatives. Because of the uncertainty associated in early stage design evaluation, the varying degree of customer expectation must be incorporated into the evaluation system. Non-traditional fuzzy sets are used to represent expectations of the customer and compare them to design solution parameters. A case study is presented to illustrate the design method.

scholarly journals OPTIMIZATION BUILDING PERFORMANCE IN EARLY DESIGN STAGE USING INTEGRATED DYNAMIC MODEL

MODUL ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 151-156
Author(s):  
Dany Perwita Sari ◽  
Pradhana Jati Budhi Laksana
Keyword(s):  
Dynamic Model ◽  
Early Stage ◽  
Building Envelope ◽  
Design Stage ◽  
Building Performance ◽  
Early Design Stage ◽  
Energy Efficient Buildings ◽  
New Strategy ◽  
Lighting Simulation ◽  
Early Stage Design

Considering the magnitude of energy loss in building, development of energy saving methods appears to be essential. Daylight plays a significant role in designing energy efficient buildings and improving visual comfort for the occupants. Many daylight analysis methods have been developed in this area. Most of these methods focus on opening maximization. These methods unfortunately might reduce comfort since it causes direct solar glare. There is a need for a reliable lighting simulation model to control the lighting strategy in early stage design. This study proposes a strategy for visualizing daylight analysis of buildings by using Integrated Dynamic Model (IDM). IDM is a combination of design tools used during the conceptual phase for holistic classroom that considers the building’s energy usage, daylight distribution, and thermal indoor environment. The optimization focus is related maximize the performance of the building envelope design. The purpose of this paper are; firstly, providing a new strategy for visualizing the predicting daylight while respecting architectural integrity. The second purpose is to facilitate the designer for choosing window and envelope design alternatives during early stages. The third is to maximize the positive impacts of daylight. Lastly, hopefully IDM could present a simplified simulation and analyze method with the timely, accurate and efficient process.

Feature-Based 3-D Sketching for Early Stage Design

1995 ◽  
Author(s):  
Malgorzata M. Sturgill ◽  
Elaine Cohen ◽  
Richard F. Riesenfeld
Keyword(s):  
Early Stage ◽  
Design Stage ◽  
Cross Sectional ◽  
Analysis Process ◽  
Initial Stage ◽  
Feature Based ◽  
Mere Presence ◽  
Early Stage Design ◽  
Pass Through ◽  
Sectional Shape

Abstract During early stages of design, the mere presence of items, their relative positioning, and their interrelationships can be more significant than fine details, like exact dimensions, whether a hole is counterbored, or the exact cross-sectional shape of a groove. Most CAD systems have little, if any, support for this critical, incipient design stage, In addressing this economically compelling and highly leveraged area, we present an intuitive, feature-based approach to 3-D design which permits a complete first pass through the design-manufacturing cycle even before a detailed specification is complete. We report a functioning 3-D design front-end for a solid modeling system that has been used for fast intra-part and inter-part, visual, generalized feature specification, a frontend that is intimately connected to the system so that both visual and detailed design can be carried out concurrently on the same model to meet designer needs. Hence, the design that is “captured” during the sketch and modify phase using this approach is fully usable for activities that traditionally require a fully detailed solid model, such as rendering, finite element and other analysis, assembly analysis, process planning, and manufacturing at this initial stage instead of the traditionally late stages.

An Energy Formulation for Parametric Size and Shape Optimization of Compliant Mechanisms

1999 ◽  
Vol 121 (2) ◽  
pp. 229-234 ◽  
Author(s):  
J. A. Hetrick ◽  
S. Kota
Keyword(s):  
Shape Optimization ◽  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Optimization Procedure ◽  
Stress Constraints ◽  
Optimization Techniques ◽  
Mechanical Transmission ◽  
Dimensional Synthesis ◽  
Size And Shape ◽  
Mechanical Devices

Compliant mechanisms are jointless mechanical devices that take advantage of elastic deformation to achieve a force or motion transformation. An important step toward automated design of compliant mechanisms has been the development of topology optimization techniques. The next logical step is to incorporate size and shape optimization to perform dimensional synthesis of the mechanism while simultaneously considering practical design specifications such as kinematic and stress constraints. An improved objective formulation based on maximizing the energy throughput of a linear static compliant mechanism is developed considering specific force and displacement operational requirements. Parametric finite element beam models are used to perform the size and shape optimization. This technique allows stress constraints to limit the maximum stress in the mechanism. In addition, constraints which restrict the kinematics of the mechanism are successfully applied to the optimization problem. Resulting optimized mechanisms exhibit efficient mechanical transmission and meet kinematic and stress requirements. Several examples are given to demonstrate the effectiveness of the optimization procedure.

Linking Creativity Measurements to Product Market Favorability: A Data-Mining Approach

2017 ◽  
Author(s):  
Christian E. Lopez B. ◽  
Xuan Zheng ◽  
Scarlett R. Miller
Keyword(s):  
Data Mining ◽  
Early Stage ◽  
Product Market ◽  
New Product ◽  
Design Stage ◽  
Future Market ◽  
Early Design ◽  
Early Design Stage ◽  
Data Mining Approach ◽  
The Future

While creative ideas can lead to market success and payoff, they are also associated with high risks and uncertainties. One way to reduce these uncertainties is to provide decision makers with valuable information about the innovative potential and future success of an idea. Even though several metrics have been proposed in the literature to evaluate the creativity of early design-stage ideas, these metrics do not provide information about the future product success or market favorability of new product ideas. Hence, existing metrics fail to link the creativity of early-stage ideas to their future market favorability. In order to bridge this gap, the current work proposes a new metric to estimate early design-stage ideas’ favorability and analyzes its relationship with current creativity metrics. A data-mining driven method to assess the future favorability of new product ideas using customers’ reviews of current market products that shared similar features with the new ideas of interest is presented. The results suggest that the new product idea favorability is positively correlated with relative creativity metrics and existing product market favorability ratings. This method can be used to help designers gain a better insight into the creativity and market favorability potential of new product ideas in early design-stages via a systematic approach; hence, helping reduce the risks and uncertainties associated with early-phase ideas during the screening and selecting process.

scholarly journals A STUDY OF ENVIRONMENTAL APPROACH IN EARLY DESIGN STAGE

BORDER ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 53-64
Author(s):  
Fenty Ratna Indarti
Keyword(s):  
Early Stage ◽  
Developed Countries ◽  
Energy Performance ◽  
Design Stage ◽  
Temperate Climate ◽  
Building Performance ◽  
Early Design ◽  
Early Design Stage ◽  
Earth Condition ◽  
Reduce Carbon Emission

Due to the ozone layer depletion, global warming and climate change, there is a significant increase to reduce carbon emission. Practitioners and academia undertake studies to promote environmentally friendly built environments. Developed countries have established specific standards to achieve a carbon neutral as their commitment to contribute for a better earth condition. Design phases are considered as the early stage where the environmental approach needs to be applied to predict the building performance as soon as possible to maximise the energy efficiency of the proposed building. Another significant factor affecting the building energy performance is climate. Climate becomes the first parameter to generate building proposals as it is contextual to the site. This study aims to assess the application of environmental approach in designing educational building in temperate climate during the early design stage. The combination of design and simulation during the early design stage, helps to define the best design proposal to adopt passive design that harvest the environment condition as much as possible to deliver comfort into the building.

Efficient Development of Continuum/Compliant Planar Linkage Mechanisms

2019 ◽  
Author(s):  
Woo Rib Suh ◽  
J. Michael McCarthy ◽  
Edwin A. Peraza Hernandez
Keyword(s):  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Shape Parameters ◽  
Element Analysis ◽  
Initial Node ◽  
Synthesis Of Mechanisms ◽  
Efficient Alternative ◽  
Computationally Intensive ◽  
The Given ◽  
The Continuum

Abstract This paper presents a method to develop continuum/compliant mechanisms based on planar bar-node linkage precursors. The method takes as inputs the initial node positions and connectivity data of a given bar-node linkage and converts it into a continuum/compliant mechanism having the same targeted motion. The line bars of the given bar-node linkage are thickened into trapezoidal planar members and the nodes are thickened by introducing fillets at each intersection of bars. The thicknesses of the bars and the shape parameters of the fillets in the continuum/compliant linkage are optimized to obtain the same targeted motion of the given bar-node linkage while keeping stresses below a maximum allowable value. Each design generated during the optimization process is evaluated using finite element analysis. The present method allows for the synthesis of mechanisms having the following advantages over conventional bar-node linkages: 1) They do not require complex ball or pin joints; 2) they can be readily 3-D printed and size-scaled, and 3) they can be optimized to decrease stresses below a maximum allowable value. Furthermore, the method uses a relatively small number of optimization variables (thicknesses of the members, shape-parameters of the fillets), making it an efficient alternative to more complex and computationally intensive methods for synthesizing compliant mechanisms such as those incorporating topology optimization.

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