Multicriteria Optimization Techniques for Highly Accurate Focusing Systems

1988 ◽  
pp. 309-354 ◽  
Author(s):  
Hans A. Eschenauer
Keyword(s):  
Multicriteria Optimization ◽  
Optimization Techniques

Multicriteria Optimization Model for a Containership Design

1994 ◽  
Vol 31 (04) ◽  
pp. 258-268
Author(s):  
Tapabrata Ray ◽  
Om Prakash Sha
Keyword(s):  
Multicriteria Optimization ◽  
Optimization Techniques ◽  
Time Span ◽  
Estimation Methods ◽  
Optimization Approach ◽  
Relative Importance ◽  
Decision System ◽  
Overall Design ◽  
Design Variables ◽  
Multi Attribute Decision Making

This paper describes a multicriteria optimization approach to ship design. The method incorporates accepted naval architectural estimation methods, a decision system handler and a nonlinear optimization tool. It allows the designer to identify different objectives, define prescribed limits on the design variables or define constraints on the design. The decision system identifies the weightages corresponding to different objectives based on the relative importance of the objectives using multi-attribute decision-making methods. The advantage of using optimization techniques along with a decision system handler allows the designer to develop new designs, while considering various interactions within the system, in a shorter time span. The proposed approach is illustrated by its application to a containership design. The effect of the weightages associated with the different objectives on the overall design is shown in the case studies.

Solving bilevel programming problems with multicriteria optimization techniques

OPSEARCH ◽  
2009 ◽  
Vol 46 (2) ◽  
pp. 169-183 ◽  
Author(s):  
C. O. Pieume ◽  
L. P. Fotso ◽  
P. Siarry
Keyword(s):  
Bilevel Programming ◽  
Multicriteria Optimization ◽  
Optimization Techniques ◽  
Bilevel Programming Problems

Multicriteria Optimization of an Oven With a Novel ε-Constraint-Based Sandwiching Method

2020 ◽  
Vol 143 (1) ◽  
Author(s):  
Dimitri Nowak ◽  
Tomas Johnson ◽  
Andreas Mark ◽  
Charlotte Ireholm ◽  
Fabio Pezzotti ◽  
...  
Keyword(s):  
Multicriteria Optimization ◽  
Multiple Scales ◽  
State Of The Art ◽  
Industrial Process ◽  
Optimization Method ◽  
Optimization Techniques ◽  
Immersed Boundary ◽  
Automotive Parts ◽  
Time And Energy ◽  
Thick Layers

Abstract Oven curing of automotive parts is a complex industrial process involving multiple scales ranging from submillimeter thick layers to the size of the ovens, and long curing times. In this work, the process is simulated by state-of-the-art immersed boundary techniques. First, the simulations are validated against temperature measurements, in a lab scale oven, of three parts taken from a truck cab. Second, a novel multicriteria optimization method is proposed. It is applied to study the optimal positioning of the three parts with respect to curing time and energy consumption. The results presented demonstrate that complex industrial heat transfer processes can be optimized by combining state-of-the-art simulation technology and deterministic optimization techniques.

Review on the aerodynamics of intermediate compressor duct

2020 ◽  
Vol 14 (4) ◽  
pp. 7446-7468
Author(s):  
Manish Sharma ◽  
Beena D. Baloni
Keyword(s):  
High Pressure ◽  
Pressure Loss ◽  
Flow Analysis ◽  
Outer Wall ◽  
Optimization Techniques ◽  
Optimum Pressure ◽  
Research Areas ◽  
Static Pressure Distribution ◽  
High Pressure Compressor ◽  
Pressure Compressor

In a turbofan engine, the air is brought from the low to the high-pressure compressor through an intermediate compressor duct. Weight and design space limitations impel to its design as an S-shaped. Despite it, the intermediate duct has to guide the flow carefully to the high-pressure compressor without disturbances and flow separations hence, flow analysis within the duct has been attractive to the researchers ever since its inception. Consequently, a number of researchers and experimentalists from the aerospace industry could not keep themselves away from this research. Further demand for increasing by-pass ratio will change the shape and weight of the duct that uplift encourages them to continue research in this field. Innumerable studies related to S-shaped duct have proven that its performance depends on many factors like curvature, upstream compressor’s vortices, swirl, insertion of struts, geometrical aspects, Mach number and many more. The application of flow control devices, wall shape optimization techniques, and integrated concepts lead a better system performance and shorten the duct length.  This review paper is an endeavor to encapsulate all the above aspects and finally, it can be concluded that the intermediate duct is a key component to keep the overall weight and specific fuel consumption low. The shape and curvature of the duct significantly affect the pressure distortion. The wall static pressure distribution along the inner wall significantly higher than that of the outer wall. Duct pressure loss enhances with the aggressive design of duct, incursion of struts, thick inlet boundary layer and higher swirl at the inlet. Thus, one should focus on research areas for better aerodynamic effects of the above parameters which give duct design with optimum pressure loss and non-uniformity within the duct.

Application of Computational Mechanics to Tire Design—Yesterday, Today, and Tomorrow

2011 ◽  
Vol 39 (4) ◽  
pp. 223-244 ◽  
Author(s):  
Y. Nakajima
Keyword(s):  
Finite Element ◽  
New Technologies ◽  
Computational Mechanics ◽  
Design Procedure ◽  
Side Wall ◽  
Rolling Resistance ◽  
Optimization Techniques ◽  
Stress Strain ◽  
Element Analysis ◽  
Crown Shape

Abstract The tire technology related with the computational mechanics is reviewed from the standpoint of yesterday, today, and tomorrow. Yesterday: A finite element method was developed in the 1950s as a tool of computational mechanics. In the tire manufacturers, finite element analysis (FEA) was started applying to a tire analysis in the beginning of 1970s and this was much earlier than the vehicle industry, electric industry, and others. The main reason was that construction and configurations of a tire were so complicated that analytical approach could not solve many problems related with tire mechanics. Since commercial software was not so popular in 1970s, in-house axisymmetric codes were developed for three kinds of application such as stress/strain, heat conduction, and modal analysis. Since FEA could make the stress/strain visible in a tire, the application area was mainly tire durability. Today: combining FEA with optimization techniques, the tire design procedure is drastically changed in side wall shape, tire crown shape, pitch variation, tire pattern, etc. So the computational mechanics becomes an indispensable tool for tire industry. Furthermore, an insight to improve tire performance is obtained from the optimized solution and the new technologies were created from the insight. Then, FEA is applied to various areas such as hydroplaning and snow traction based on the formulation of fluid–tire interaction. Since the computational mechanics enables us to see what we could not see, new tire patterns were developed by seeing the streamline in tire contact area and shear stress in snow in traction.Tomorrow: The computational mechanics will be applied in multidisciplinary areas and nano-scale areas to create new technologies. The environmental subjects will be more important such as rolling resistance, noise and wear.

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