A Novel Framework for Simultaneous Topology and Sizing Optimization of Complex, Multi-Domain Systems-of-Systems

2020 ◽  
Vol 142 (9) ◽  
Author(s):  
Donald J. Docimo ◽  
Ziliang Kang ◽  
Kai A. James ◽  
Andrew G. Alleyne
Keyword(s):  
Case Studies ◽  
Cooling System ◽  
Optimization Procedure ◽  
Design Framework ◽  
Sizing Optimization ◽  
Systems Of Systems ◽  
Analysis Of Alternatives ◽  
Subsystem Design ◽  
System Graph ◽  
Graph Based Model

Abstract This article presents a novel design framework for topology and component sizing optimization of multi-domain dynamic systems described by conservation laws. Multidisciplinary design optimization (MDO) is a powerful tool for minimizing metrics such as inefficiency and cost for these systems-of-systems (SoS). However, quality of the designs identified from the optimization procedure depends on model accuracy and ability to capture inter-system interactions. This work utilizes a conservation-based, graphical modeling approach to capture physical system dynamics and interactions, and expands it to be used in MDO techniques. This yields three contributions to the literature. First, an augmented graph-based model is provided, expressing continuous and discrete design variable values as changes to vertex size, edge size, and edge connections of the dynamic system graph. Second, a sizing and topology optimization framework is developed using the augmented graph-based model as a basis. Third, analytical and numerical sensitivity functions are derived for a cooling system design problem, stemming from application of the design framework. The design framework is applied to two case studies for cooling subsystem design and electric vehicle (EV) powertrain design, with the goal of optimizing thermal and electrical component sizes, as well as discrete choices in the topology of the system being designed. These case studies provide examples for how the design framework enables analysis of alternatives (AoA) during early design stages.

Parametric Analysis of a Thermally Actuated Cooling System for Space Applications

2000 ◽  
Author(s):  
K. Freudenberg ◽  
W. E. Lear ◽  
S. A. Sherif
Keyword(s):  
Thermal Management ◽  
Parametric Analysis ◽  
Cooling System ◽  
Space Applications ◽  
Development Stages ◽  
Prototype Development ◽  
Design Cycle ◽  
Subsystem Design ◽  
Design Requirements ◽  
Thermally Actuated

Abstract Integration of new and existing technologies for thermal management will be required to meet the challenges associated with the increased need for an efficient, lightweight, heat rejection system. Subsystem design requirements, such as thermal and mass management, must be brought into me design cycle to establish an optimal configuration. This paper provides a parametric analysis that determines a range of parameters under which a proposed system becomes viable from a weight management standpoint. The analysis can be applied to essentially any space-operated thermally-actuated heat pump with power and refrigeration subsystems. By applying the techniques demonstrated in this paper, designers can identify and optimize conceptual configurations during the initial prototype development stages to reduce payload weight and increase financial savings.

An Approach to Systems-of-Systems Structural Analysis through Interoperability Assessment: Application on Moroccan Case

2019 ◽  
Vol 41 ◽  
pp. 175-189
Author(s):  
Ilyas Ed-Daoui ◽  
Aicha Koulou ◽  
Norelislam El Hami ◽  
Abdelkhalak El Hami ◽  
Mhamed Itmi ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Case Studies ◽  
Systems Of Systems ◽  
Component Systems ◽  
Economic Infrastructure ◽  
Exchange Inefficiency

In this paper, we propose an indicator to systems-of-systems (SoS) structural analysis through dependencies evaluation which is based on interoperability and exchange inefficiency assessments, with dependencies representing links between component systems within the SoS. Interoperability is a quality that can be viewed from various perspectives. Therefore, we propose an illustrative classification for interoperability that embraces: barriers, scopes and levels. Our study involves a set of metrics to assess each interdependency’s interoperability barriers within the SoS through interoperability levels. Two different case studies, from the Moroccan economic infrastructure, are presented to apply the proposed approach. Results are cross-compared and evaluated.

scholarly journals Simulating Systems-of-Systems Dynamic Architectures

2019 ◽  
Vol 17 (2) ◽  
Author(s):  
Wallace Alves Esteves Manzano ◽  
Valdemar Vicente Graciano Neto ◽  
Elisa Yumi Nakagawa
Keyword(s):  
Case Studies ◽  
Architectural Design ◽  
Systems Of Systems ◽  
Dynamic Architecture ◽  
Design Time ◽  
Multiple Case ◽  
Multiple Case Studies ◽  
Operation Results ◽  
The Impact

Systems-of-Systems (SoS) combine heterogeneous, independent systems to offer complex functionalities for highly dynamic smart applications. Due to their critical nature, SoS should be reliable and work without interruption that could cause serious losses. SoS architectural design can facilitate the prediction of the impact of failures due to SoS behavior. However, existing approaches do not support such evaluation. The main contribution of this paper is to present Dynamic-SoS, an approach to predict, at design time, the SoS architectural behavior at runtime to evaluate whether the SoS can sustain their operation. Results of our multiple case studies reveal Dynamic-SoS is a promising approach that could contribute to the quality of SoS by reliably enabling prior assessment of their dynamic architecture.

scholarly journals DESIGN FRAMEWORK FOR ABLUTION SPACES OF ICONIC MOSQUES IN MALAYSIA

2021 ◽  
Vol 6 (4) ◽  
pp. 251-263
Author(s):  
Nangkula Utaberta ◽  
Hayder Jawwad Shakir
Keyword(s):  
Case Studies ◽  
User Experience ◽  
Future Generation ◽  
Design Guidelines ◽  
Social Activities ◽  
Design Framework ◽  
Architectural Drawing ◽  
Holy Quran ◽  
The Future ◽  
The Holy Quran

Mosques are places where Muslims perform prayers and other social activities. Those are built as a place for humans to worship the Almighty Allah at all times, as well as to provide an environment that responds to the needs of devotees and educates the future generation by the Quranic verses and the Prophet's teachings. Derived from the Holy Quran and the Prophet, purity is compulsory at all times for Muslims, and has many meanings that are applicable during prayers and the day. The ablution room is integrated into all mosque designs because it is an unseparated element. However, Malaysian mosques have been questioned in their application of some Islamic regulations to uniform a hygienically clean space that can respond the needs of Muslims. The design of the ablution rooms in Malaysian mosques is encountering a serious issue regarding the spaces' cleanliness. Although the ablution room has been designed to respond the Muslim's need to conduct the ablution practice and to cleanse a person spiritually and physically, several problems related to its design aspects were revealed. This research investigates the cleanliness of the Malaysian ablution space. It examines how the design aspects of the ablution rooms of the Iconic Malaysian Mosques impact the area's cleanliness and its users. Five case studies were selected for this study. Three methods of study were utilized: physical observation, architectural drawing analysis, and interviews. Aspects of design form, ventilation, cleaning status, and user experience were discussed. This research suggested that the larger mosques in Malaysia were suffering from serious hygiene issues that resulted from many aspects, including poor design, ventilation systems, and users' abuse. The research suggested some design guidelines for future and existing ablution areas that will improve the cleanliness.

scholarly journals Surrogate-Based Optimization of a Centrifugal Pump with Volute Casing for an Automotive Engine Cooling System

2021 ◽  
Vol 11 (23) ◽  
pp. 11470
Author(s):  
Remo De Donno ◽  
Alessia Fracassi ◽  
Antonio Ghidoni ◽  
Alessandro Morelli ◽  
Gianmaria Noventa
Keyword(s):  
Centrifugal Pump ◽  
High Performance ◽  
Cooling System ◽  
Optimization Technique ◽  
Volumetric Flow Rate ◽  
Optimization Procedure ◽  
Operating Conditions ◽  
Centrifugal Pumps ◽  
Automotive Engine ◽  
Surrogate Based Optimization

This paper investigates the capability of a surrogate-based optimization technique for the advanced design of centrifugal pumps. The centrifugal pump considered in this work is designed for the automotive cooling system and consists of an impeller, a vaneless diffuser and a volute. A fully three-dimensional geometry parametrization based on Bézier surfaces is presented. The optimization procedure includes the following software packages: Scilab for the geometric parametrization, Ansys-CFX for the CFD simulations and DAKOTA for the optimization management. The initial geometry is defined by a 0D code that provides a preliminary design of the pump, given the operating conditions, i.e., the volumetric flow rate, the head and the rotating speed. In this work an operative point typical of high performance gasoline cars is considered.

Composing Systems of Systems

2011 ◽  
pp. 139-152
Author(s):  
Panayiotis Periorellis
Keyword(s):  
Information System ◽  
Information Systems ◽  
Case Studies ◽  
Computer Systems ◽  
Organizational Boundaries ◽  
Systems Of Systems ◽  
Technical Challenge ◽  
System Composition

Information Systems in general carry or have embedded in their structure, elements that stem from the organization’s strategic, tactical, and operational goals. Finding elements of an organization’s strategic, tactical, or operational goals embedded in computer systems is not at all surprising, since most developers and programmers were taught how to successfully map such goals into the Information System. We are, however, in an era where technology allows us to develop systems that are composed of smaller autonomous parts (sometimes complete systems themselves) that are integrated together despite being bound by their corresponding organizational boundaries. Therefore integration is not only a technical challenge but an organizational one, too. In this chapter we address a number of issues, namely system composition, regulation, evolution, and dependability, using examples from the two case studies we worked on for three years.

scholarly journals On the kinematics and synthesis of a geared five-bar slider–crank mechanism

2011 ◽  
Vol 225 (5) ◽  
pp. 1253-1261 ◽  
Author(s):  
I A Sultan ◽  
A Kalim
Keyword(s):  
Mathematical Model ◽  
Case Studies ◽  
Optimization Procedure ◽  
Industrial Applications ◽  
Levenberg Marquardt ◽  
Gradient Based ◽  
Motion Characteristics ◽  
Crank Mechanism

The geared five-bar mechanism possesses kinematic abilities that qualify its utility in various industrial applications. Small changes to the mechanism topology or dimensions create new designs with different motion characteristics. This article presents design-orientated kinematical insights and mathematical treatments for the embodiment of the mechanism in which the end gear is eccentrically pivoted to a sliding element. For its synthesis, a kinematic classification is introduced and approximate curves are used to guide the motion of the slider. A gradient-based Levenberg–Marquardt formulation is employed for the optimization procedure. Geometric, mobility, and dimensional constraints are utilized together with numerical position equations for the analysis. Two case studies are presented at the end of this article to highlight the versatility of the mechanism and prove the validity of the presented mathematical model.

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