A Multi-Objective Optimisation-Based Structural Design Procedure for the Concept Stage – A Chemical Product Tanker Case Study

2010 ◽  
Vol 57 (3) ◽  
pp. 182-196 ◽  
Author(s):  
Sören Ehlers ◽  
Heikki Remes ◽  
Alan Klanac ◽  
Hendrik Naar
Keyword(s):  
Structural Design ◽  
Design Procedure ◽  
Chemical Product ◽  
Multi Objective

scholarly journals A New Strategy for Multi- Objective Dynamic and Kinematic Optimization of Robotic Manipulators with Application in Haptic Interfaces

2021 ◽  
Author(s):  
Behrooz Alae
Keyword(s):  
Dynamic Capabilities ◽  
Design Procedure ◽  
Design Parameters ◽  
Haptic Interfaces ◽  
Optimization Strategy ◽  
Multi Objective ◽  
New Strategy ◽  
Increasing Demand ◽  
Robotic Applications

There is an increasing demand for higher performance in modern robotic applications. To meet the need for more accuracy and fast dynamic response, considering inertial effects is necessary. This thesis proposes a new global multi-objective optimization strategy to tune the geometric and dynamic capabilities of a manipulator. Then, as a case study, the kinematics and dynamic behavior of a five-bar-linkage haptic interface is analyzed and a new design procedure is obtained using a new global and constrained multi-objective technique. The minimax culling algorithm was used to design parameters for optimal kinematics and dynamic dexterity measure.

scholarly journals A New Strategy for Multi- Objective Dynamic and Kinematic Optimization of Robotic Manipulators with Application in Haptic Interfaces

2021 ◽  
Author(s):  
Behrooz Alae
Keyword(s):  
Dynamic Capabilities ◽  
Design Procedure ◽  
Design Parameters ◽  
Haptic Interfaces ◽  
Optimization Strategy ◽  
Multi Objective ◽  
New Strategy ◽  
Increasing Demand ◽  
Robotic Applications

There is an increasing demand for higher performance in modern robotic applications. To meet the need for more accuracy and fast dynamic response, considering inertial effects is necessary. This thesis proposes a new global multi-objective optimization strategy to tune the geometric and dynamic capabilities of a manipulator. Then, as a case study, the kinematics and dynamic behavior of a five-bar-linkage haptic interface is analyzed and a new design procedure is obtained using a new global and constrained multi-objective technique. The minimax culling algorithm was used to design parameters for optimal kinematics and dynamic dexterity measure.

Wastewater treatment and nutrient removal in the combined reactor

1998 ◽  
Vol 38 (1) ◽  
pp. 87-95 ◽  
Author(s):  
M. Roš ◽  
J. Vrtovšek
Keyword(s):  
Organic Compounds ◽  
Industrial Wastewater ◽  
Design Procedure ◽  
Order Reaction ◽  
Treated Wastewater ◽  
Nitrification Rate ◽  
Zero Order Reaction ◽  
Aerobic Reactor ◽  
Complex Organic

A combined anaerobic anoxic aerobic reactor for the treatment of the industrial wastewater that contains nitrogen and complex organic compounds as well as its design procedure is presented. The purpose of our experiments was to find a simple methodology that would provide combined reactor design. The reactor is based on the combination of anaerobic, anoxic and aerobic process in one unit only. It was found that the HRT even under 1 hour in the anaerobic zone is long enough for the efficient transformation of complex organic compounds into readily biodegradable COD which is then used in dentrification process. In the N-NO3 concentration range 1.5-50 mg/l the denitrification rate could be expressed as half-order reaction when the CODrb was in excess. N-NO3 removal efficiency is controlled by the recycle flow from the aerobic to the anoxic zone. Nitrification rate can be expressed as first, half or zero-order reaction with respect to effluent N-NH4 concentration. Nitrification rate depends on the dissolved oxygen concentration and hydrodynamic conditions in the reactor. Case study for design of a pilot plant of the combined reactor for treatment of pre-treated pharmaceutical wastewater is shown. Characteristics of pre-treated wastewater were: COD=200 mg/l, BOD5=20 mg/l, N-Kjeldahl=80 mg/l, N-NH4=70 mg/l, N-NOx<1 mg/l, P-PO4=5 mg/l. Legal requirements for treated wastewater were: COD=<100 mg/l, BOD5<5 mg/l, N-NH4=<1 mg/l, N-NOx=<10 mg/l.

scholarly journals Floating-bending tensile-integrity structures

2021 ◽  
Vol 8 (1) ◽  
pp. 89-95
Author(s):  
Micol Palmieri ◽  
Ilaria Giannetti ◽  
Andrea Micheletti
Keyword(s):  
Structural Design ◽  
Membrane Systems ◽  
Limit States ◽  
Form Finding ◽  
Supported Membrane ◽  
Tensegrity Systems ◽  
Matlab Implementation ◽  
Diamond Type ◽  
Conceptual Work

Abstract This is a conceptual work about the form-finding of a hybrid tensegrity structure. The structure was obtained from the combination of arch-supported membrane systems and diamond-type tensegrity systems. By combining these two types of structures, the resulting system features the “tensile-integrity” property of cables and membrane together with what we call “floating-bending” of the arches, a term which is intended to recall the words “floating-compression” introduced by Kenneth Snelson, the father of tensegrities. Two approaches in the form-finding calculations were followed, the Matlab implementation of a simple model comprising standard constant-stress membrane/cable elements together with the so-called stick-and-spring elements for the arches, and the analysis with the commercial software WinTess, used in conjunction with Rhino and Grasshopper. The case study of a T3 floating-bending tensile-integrity structure was explored, a structure that features a much larger enclosed volume in comparison to conventional tensegrity prisms. The structural design of an outdoor pavilion of 6 m in height was carried out considering ultimate and service limit states. This study shows that floating-bending structures are feasible, opening the way to the introduction of suitable analysis and optimization procedures for this type of structures.

scholarly journals Multi-objective parametrization of interatomic potentials for large deformation pathways and fracture of two-dimensional materials

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Xu Zhang ◽  
Hoang Nguyen ◽  
Jeffrey T. Paci ◽  
Subramanian K. R. S. Sankaranarayanan ◽  
Jose L. Mendoza-Cortes ◽  
...  
Keyword(s):  
Large Deformation ◽  
Functional Form ◽  
Principal Component ◽  
Interatomic Potentials ◽  
Two Dimensional ◽  
Multi Objective ◽  
Multi Objective Genetic Algorithm ◽  
Two Dimensional Materials ◽  
Definition Of

AbstractThis investigation presents a generally applicable framework for parameterizing interatomic potentials to accurately capture large deformation pathways. It incorporates a multi-objective genetic algorithm, training and screening property sets, and correlation and principal component analyses. The framework enables iterative definition of properties in the training and screening sets, guided by correlation relationships between properties, aiming to achieve optimal parametrizations for properties of interest. Specifically, the performance of increasingly complex potentials, Buckingham, Stillinger-Weber, Tersoff, and modified reactive empirical bond-order potentials are compared. Using MoSe2 as a case study, we demonstrate good reproducibility of training/screening properties and superior transferability. For MoSe2, the best performance is achieved using the Tersoff potential, which is ascribed to its apparent higher flexibility embedded in its functional form. These results should facilitate the selection and parametrization of interatomic potentials for exploring mechanical and phononic properties of a large library of two-dimensional and bulk materials.

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