Reflections on the Opportunities of Multicriteria Optimization within Simulation Studies

2014 ◽  
Vol 693 ◽  
pp. 159-164
Author(s):  
Vladimír Jerz
Keyword(s):  
Theoretical Model ◽  
Optimal Design ◽  
Process Control ◽  
Simulation Model ◽  
Multicriteria Optimization ◽  
Optimization Methods ◽  
Simulation Studies ◽  
Simulation And Optimization ◽  
Logistics Systems ◽  
Simulation Based

This article discusses the possibilities of linking simulation and optimization methods, processes and tools to solve complex tasks of optimal design and process control in production and logistics systems. A theoretical model of simulation-based optimization is formulated. Its use in resolving practical problems as well as methods for the integration of algorithms for multi-criteria optimization into the simulation model are outlined.

scholarly journals A Comprehensive Study on the Optimal Design of Magnetorheological Dampers for Improved Damping Capacity and Dynamical Adjustability

Actuators ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 64
Author(s):  
Liankang Wei ◽  
Hongzhan Lv ◽  
Kehang Yang ◽  
Weiguang Ma ◽  
Junzheng Wang ◽  
...  
Keyword(s):  
Optimal Design ◽  
Optimization Methods ◽  
Design Stage ◽  
Damping Capacity ◽  
Damping Force ◽  
Simulation And Optimization ◽  
Damping Characteristics ◽  
Hysteretic Characteristics ◽  
Gap Width ◽  
Comprehensive Study

Purpose: We aim to provide a systematic methodology for the optimal design of MRD for improved damping capacity and dynamical adjustability in performing its damping function. Methods: A modified Bingham model is employed to model and simulate the MRD considering the MR fluid’s compressibility. The parameters that describe the structure of MRD and the property of the fluid are systematically examined for their contributions to the damping capacity and dynamically adjustability. A response surface method is employed to optimize the damping force and dynamically adjustable coefficient for a more practical setting related to the parameters. Results: The simulation system effectively shows the hysteretic characteristics of MRDs and shows our common sense understanding that the damping gap width and yoke diameter have significant effects on the damping characteristics of MRD. By taking a typical MRD device setup, optimal design shows an increase of the damping force by 33% and an increase of the dynamically adjustable coefficient by 17%. It is also shown that the methodology is applicable to other types of MDR devices. Conclusion: The compressibility of MR fluid is one of the main reasons for the hysteretic characteristics of MRD. The proposed simulation and optimization methods can effectively improve the MRD’s damping performance in the design stage.

REVIEW OF DESIGN AND FORECASTING THE QUALITY OF SPINDLE ASSEMBLIES WITH GASSTATIC SUPPORTS

2020 ◽  
Author(s):  
Владимир Павлович Легаев ◽  
Дмитрий Вадимович Симаков
Keyword(s):  
Optimal Design ◽  
Multicriteria Optimization ◽  
Optimization Methods ◽  
Output Characteristics ◽  
Dynamic Quality ◽  
Spindle Assemblies

Оптимальное проектирование сложных технических объектов невозможно без прогнозирования характеристик их работоспособности. Применяемые при этом методы многокритериальной оптимизации напрямую используют в качестве критериев выходные характеристики динамического качества, поэтому задача прогнозирования последних, в конечном счете, определяет качество проектирования. The optimal design of complex technical objects is impossible without predicting the characteristics of their performance. The multicriteria optimization methods used in this case directly use the output characteristics of dynamic quality as criteria, therefore, the task of forecasting the latter, ultimately, determines the quality of the design.

A Framework for the Design and Optimization of Self-Folding Structures

2017 ◽  
Author(s):  
Landen Bowen ◽  
Mary Frecker ◽  
Timothy W. Simpson ◽  
Rebecca Strzelec
Keyword(s):  
Active Material ◽  
Optimization Methods ◽  
Design And Optimization ◽  
Simulation And Optimization ◽  
Optimization Framework ◽  
Simulation Based ◽  
Trade Space Exploration ◽  
Specific Implementation ◽  
Passive Materials ◽  
Novel Design

Due to the multidisciplinary nature and complexity of self folding structures, it can be difficult to know where to start when designing for a new application. Decisions about the active and passive materials to be used and the functionality of the design are very interrelated and can create problems if not considered holistically. There is a need to formalize the steps necessary to move from an origami-inspired shape to a full self-folding concept. In this paper, an optimization framework is proposed to help designers create self-folding, origami-inspired structures that can accommodate any type of active material. The optimization framework formalizes the design steps needed to move from a target shape/application to a self-folding design. The method is simulation-based, allowing a self-folding design candidate to be identified quickly prior to costly trial-and-error physical prototyping. A general version of the framework is presented that can accommodate a variety of simulation and optimization methods, after which a specific implementation of the framework utilizing a dynamic model and trade space exploration tools is discussed and then used to design a multi-field self-folding carton. By using the framework, a novel design was identified that both significantly decreased the folding error as well as the amount of active material used when compared to designs that would typically be attempted in a trial-by-error design approach. The demonstrated self-folding design optimization framework has the potential to streamline the design of self-folding structures, resulting in better designs with less time, effort, and cost.

Towards a simulation-benchmark for evaluating respirometry-based control strategies

1998 ◽  
Vol 37 (12) ◽  
pp. 219-226 ◽  
Author(s):  
Henri Spanjers ◽  
Peter Vanrolleghem ◽  
Khanh Nguyen ◽  
Henk Vanhooren ◽  
Gilles G. Patry
Keyword(s):  
Simulation Model ◽  
Control Strategy ◽  
State Of The Art ◽  
Control Strategies ◽  
Test Procedure ◽  
Full Scale ◽  
Simulation Studies ◽  
Convenient Means ◽  
Simulation Based ◽  
Simulation Results

Many respirometry-based control strategies have been proposed in the literature but few successful practical implementations or even simulation-based evaluations have been reported. The state-of-the-art provides insufficient justification for the development of a how-to-do procedure for such control strategies in full scale. It is, therefore, expected that carefully conducted simulation studies will greatly support the evaluation of proposed strategies and, eventually, the implementation in practice. These studies should be based on a rigorous methodology including simulation model, plant layout, controller and test procedure. This paper describes the development of such a methodology, termed “benchmark”. The benchmark is evaluated on the basis of a respirometry-based control strategy from the literature. Some simulation results are shown and modifications to the strategy imperative to the implementation in the benchmark are discussed. It is concluded that the benchmark provides a convenient means to perform a number of tests with the implemented control strategy. The benchmark should be further developed and tested.

scholarly journals A Simulation Model of Construction Projects Executed in Random Conditions with the Overlapping Construction Works

2021 ◽  
Vol 13 (11) ◽  
pp. 5795
Author(s):  
Sławomir Biruk ◽  
Łukasz Rzepecki
Keyword(s):  
Simulation Model ◽  
Technological Process ◽  
Construction Projects ◽  
Working Time ◽  
Simulation Studies ◽  
Construction Methods ◽  
The Impact ◽  
Construction Works

Reducing the duration of construction works requires additional organizational measures, such as selecting construction methods that assure a shorter realization time, engaging additional resources, working overtime, or allowing construction works to be performed simultaneously in the same working units. The simultaneous work of crews may affect the quality of works and the efficiency of construction processes. This article presents a simulation model aimed at assessing the impact of the overlap period on the extension of the working time of the crews and the reduction of a repetitive project’s duration in random conditions. The purpose of simulation studies is to provide construction managers with guidelines when deciding on the dates of starting the sequential technological process lines realized by specialized working crews, for sustainable scheduling and organization of construction projects.

scholarly journals Model for Determining the Optimal Trajectory of Movement of Consignments

2019 ◽  
Vol 17 (2) ◽  
pp. 56-62
Author(s):  
V. A. Demin ◽  
S. Eurich ◽  
D. B. Efimenko
Keyword(s):  
Dynamic Systems ◽  
Time Management ◽  
Analytical Modeling ◽  
Optimization Methods ◽  
Performance Criteria ◽  
Transport Systems ◽  
Intelligent Transport Systems ◽  
Intelligent Transport ◽  
Logistics Systems ◽  
And Storage

The suggested model for determining the optimal trajectories of moving consignments that form cargo flows in transport and logistics systems (TLS) is based on a combination of dynamic systems and multi-criteria optimization methods. This approach develops a methodology for solving applied control problems in TLS. Its main result is the principle of finding the maximum, subject to the criterion preferences, based on methods for determining the set of effective plans (Pareto set). At the same time, management in TLS should form models of cargo traffic taking into account the location of transport and storage complexes within the boundaries of the system being studied or designed, as well as should provide for movement of consignments according to specified performance criteria and the most rational trajectories using analytical modeling. Analytics together with digital technologies help to consider the core sense of TLS as of a subsystem of intelligent transport systems.

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