A Multi-Objective and Multi-Level Design Optimization Method for Oil and Gas Ducts

2017 ◽  
Author(s):  
Paolo Cicconi ◽  
Vincenzo Castorani ◽  
Michele Germani ◽  
Marco Mandolini ◽  
Alessio Vita
Keyword(s):  
Design Optimization ◽  
Cost Estimation ◽  
Performance Optimization ◽  
Gas Turbines ◽  
Methodological Approach ◽  
Structural Behavior ◽  
Multi Objective ◽  
Multi Level ◽  
The Cost

The paper proposes a methodological approach to support the multi-objective (i.e. cost and structural performance) optimization of complex systems, typical of the oil & gas sector. The complexity is managed through a double-level of optimization. The first one, based on simplified product models (1-D and 0-D), considers an analytical approach for the structural behavior and a parametric one for the cost estimation. The second level considers the use of a 3-D FEM solver for structural simulations, and an analytical tool for the cost estimation. As case study, the paper proposes the design optimization of an oil & gas chimney for gas turbines. The workflow analyzed during the case study describes the use of a multi-objective and multi-level approach to optimize cost, weigh, and structural behavior of oil & gas ducts.

Applications of an Interactive Balancing Procedure for Gas Turbines and Other Turbomachinery

2009 ◽  
Author(s):  
Timothy C. Allison ◽  
Harold R. Simmons
Keyword(s):  
Cost Function ◽  
Least Squares ◽  
Gas Turbine ◽  
Case Studies ◽  
Gas Turbines ◽  
Interactive Approach ◽  
Interactive Method ◽  
Balance Weight ◽  
The Cost

Least squares balancing methods have been applied for many years to reduce vibration levels of turbomachinery. This approach yields an optimal configuration of balancing weights to reduce a given cost function. However, in many situations, the cost function is not well-defined by the problem, and a more interactive method of determining the effects of balance weight placement is desirable. An interactive balancing procedure is outlined and implemented in an Excel spreadsheet. The usefulness of this interactive approach is highlighted in balancing case studies of a GE LM5000 gas turbine and an industrial fan. In each case study, attention is given to practical aspects of balancing such as sensor placement and balancing limitations.

Estimation of procurement costs incurred by public customers: a case study of a Russian region

2018 ◽  
Vol 18 (1) ◽  
pp. 68-87
Author(s):  
Andrei Yakovlev ◽  
Olga Balaeva ◽  
Andrey Tkachenko
Keyword(s):  
Public Procurement ◽  
Methodological Approach ◽  
Policy Implications ◽  
Cost Evaluation ◽  
Content Type ◽  
Russian Region ◽  
Procurement Cost ◽  
Procurement System ◽  
The Cost

Purpose This paper aims to measure the cost of procurement because public procurement procedures prescribed by legislation not only enhance transparency and competition but also entail certain transaction costs for both customers and suppliers. Design/methodology/approach These costs are important to the efficiency of the procurement system. However, very few previous studies have focused on estimating procurement costs. This paper proposes a methodology for public procurement cost evaluation. Findings This paper shows how procurement costs can be calculated using a formalized survey of public customers. This methodology was tested with a representative group of public customers operating in one region of the Russian Federation. Originality/value The authors formulate the policy implications of this paper, as they relate to the improvement of public procurement regulations and argue that this methodological approach can be applied in other developing and transitioning economies.

Design and Analysis of Manufacturing Component Under Sustainability Considerations: A Case Study of Electronic and Mechanical Indexing Head for Milling Operation

2018 ◽  
Author(s):  
Nand K. Jha ◽  
Mahmoud M. Amin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cost Estimation ◽  
Minimum Energy ◽  
Solid Modeling ◽  
Milling Machine ◽  
Element Analysis ◽  
Milling Operation ◽  
The Cost

An attempt has been made to design and analyze Indexing Head a very important component in milling operation under sustainability considerations. The design of each component of indexing head is presented along with solid modeling and finite element analysis. The cost estimation for indexing head for milling operation is also presented. The design and finite element analysis of indexing head should be utilized by manufacturers of this very useful device in milling operation. It is used for cutting gears, spirals, splines, etc. The cost estimated of the manufactured indexing head shows it to be within reasonable limits of market. Finite element analysis of each component is safe. An electronic indexing is suggested as an improvement over the mechanical indexing head. A schematic of electronic indexing is presented. The electronic indexing head can be used with milling machine not provided with indexing head and will be portable. The minimum energy needed to manufacture the indexing head is also estimated.

Maximizing Energy Harvesting of Photovoltaic Panel Full Tracking Optimization

2019 ◽  
Author(s):  
Ahmed Y. Abdelmaksoud ◽  
Hesham A. Hegazi ◽  
Mohamed S. El Morsi ◽  
Sayed M. Metwalli
Keyword(s):  
Performance Optimization ◽  
Fossil Fuels ◽  
Optimization Technique ◽  
Attractive Alternative ◽  
Photovoltaic Panel ◽  
Meta Model ◽  
The Cost ◽  
Photovoltaic Solar Cells ◽  
The City

Abstract The wide spread use of solar energy and photovoltaic solar cells attracts researchers to work hard for the objective of improving their performance to be a viable attractive alternative to fossil fuels. This work presents the optimization of the output power of a photovoltaic solar cell to harvest maximum power. The power is optimized based on PVP full tracking of the sun and the effect of the tilt, the azimuth, and the incidence angles on its performance. A meta-model is utilized as a tool in the optimization technique. A case study which develops 2nd, 3rd, and 4th order hyper-surface equations that depend on day and hour to get the optimum tilt angle and optimum azimuth angle for the city of Hurghada in Egypt. The power produced from the polynomial meta-model algorithm is higher by 25.5% over the fixed tilt and azimuth angles. The developed equations from the meta-model optimization technique can be used in tracking control systems to get optimum tilt and optimum azimuth angles at any hour and at any day. By comparing the metamodel and the lengthy performance optimization technique, the error is around 1.1%. Comparison has also been made between the cost of the fixed and full tracking photovoltaic systems.

Development of a Cost Estimation Framework for Potential Transload Facilities

2018 ◽  
Vol 2672 (9) ◽  
pp. 24-34
Author(s):  
Sadie Smith ◽  
Andrew Braham ◽  
Sarah Hernandez ◽  
John Kent
Keyword(s):  
Cost Estimation ◽  
Transportation Network ◽  
Construction Design ◽  
Unit Costs ◽  
Reasonable Cost ◽  
Survey Responses ◽  
Pavement Damage ◽  
The Cost ◽  
Cost Of Transportation

As the cost of transportation continues to rise and there is a growing push for a more environmentally friendly transportation network, optimizing mode distributions becomes an attractive solution. One way to optimize mode distributions is through strategically located freight transfer facilities, such as transload facilities. While there are many benefits to this type of facility, such as the emissions savings or pavement damage reductions garnered by shifting commodity tonnage onto alternative modes of transport, it is also essential that transportation planners understand the costs associated with building transload facilities. Unfortunately, literature does not provide an adequately disaggregated and scalable cost estimation approach that could be applied to various configurations and types of transload facilities. In this research, a cost estimation framework was created to determine the basic cost of transload facilities by type using unit costs from a construction cost database, equipment costs from local dealers, the projected commodity tonnage, design recommendations from literature, and survey responses from local facilities. A case study based upon proposed facilities in Arkansas was completed to illustrate the effectiveness of this methodology. While there is currently no construction design for these facilities, this framework yielded costs consistent with those expected. A key finding was that storage costs could account for up to 81% of a transload facility’s costs. Overall, this cost framework is believed to balance general scalability with accuracy well to provide reasonable cost estimations for constructing new or expanded facilities.

Including decision-makers preferences in the cost-deprivation trade-off during disaster interventions

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Florian Diehlmann ◽  
Patrick Siegfried Hiemsch ◽  
Marcus Wiens ◽  
Markus Lüttenberg ◽  
Frank Schultmann
Keyword(s):  
Decision Making ◽  
Humanitarian Logistics ◽  
Decision Makers ◽  
Weighted Sum ◽  
Trade Off ◽  
Content Type ◽  
Multi Objective ◽  
Conflicting Objectives ◽  
The Cost

Purpose In this contribution, the purpose of this study is to extend the established social cost concept of humanitarian logistics into a preference-based bi-objective approach. The novel concept offers an efficient, robust and transparent way to consider the decision-maker’s preference. In principle, the proposed method applies to any multi-objective decision and is especially suitable for decisions with conflicting objectives and asymmetric impact. Design/methodology/approach The authors bypass the shortcomings of the traditional approach by introducing a normalized weighted sum approach. Within this approach, logistics and deprivation costs are normalized with the help of Nadir and Utopia points. The weighting factor represents the preference of a decision-maker toward emphasizing the reduction of one cost component. The authors apply the approach to a case study for hypothetical water contamination in the city of Berlin, in which authorities select distribution center (DiC) locations to supply water to beneficiaries. Findings The results of the case study highlight that the decisions generated by the approach are more consistent with the decision-makers preferences while enabling higher efficiency gains. Furthermore, it is possible to identify robust solutions, i.e. DiCs opened in each scenario. These locations can be the focal point of interest during disaster preparedness. Moreover, the introduced approach increases the transparency of the decision by highlighting the cost-deprivation trade-off, together with the Pareto-front. Practical implications For practical users, such as disaster control and civil protection authorities, this approach provides a transparent focus on the trade-off of their decision objectives. The case study highlights that it proves to be a powerful concept for multi-objective decisions in the domain of humanitarian logistics and for collaborative decision-making. Originality/value To the best of the knowledge, the present study is the first to include preferences in the cost-deprivation trade-off. Moreover, it highlights the promising option to use a weighted-sum approach to understand the decisions affected by this trade-off better and thereby, increase the transparency and quality of decision-making in disasters.

scholarly journals Optimal Alternatives by Controlling Time and Cost of a Multi-Level Car Park Using Excel-Solver Program

2019 ◽  
Vol 54 (6) ◽  
Author(s):  
Sada Abdalkhaliq Hasan
Keyword(s):  
Optimal Solution ◽  
Time Frame ◽  
Proposed Model ◽  
Car Park ◽  
Overall Performance ◽  
Multi Level ◽  
Excel Solver ◽  
The Cost ◽  
The City

In this research the best cost and time are identified to implement a multi-level car park. The aim of this research is to develop a time frame model, including time and cost analysis, and to find optimal alternatives for a multi-level garage project during the planning phase. The proposed model has been developed using Solver program in Excel built for combining cost and time calculations by adopting the Project Management Software (MS-Project) to facilitate optimal solution access. In future the same project can be implemented at the lowest possible cost. This research concluded that it is possible to obtain the optimal solution after analyzing the alternatives using the Solver program and then taking the results of the optimization process to perform the improvement of the timeline. The research highlights the factors such as: the estimated cost, the planned time and the alternatives available for optimum performance aimed at finding optimal solutions and thus enhancing overall performance. The research was applied to the case study of one of the projects implemented within the city and found that the results are consistent with the research objective. According application of the model, the solution shows it will reduce cost and time to about 190292 $ and 91day from the cost and time of actual project.

scholarly journals GRAPHOANALYTICAL METHODOLOGICAL APPROACH TO THE COST ESTIMATION OF MINERAL DEPOSITS

2019 ◽  
pp. 71-75
Author(s):  
Vоlоdуmуr Matyukha
Keyword(s):  
Economic Theory ◽  
Cost Estimation ◽  
Methodological Approach ◽  
Mineral Resources ◽  
Cost Estimate ◽  
Mineral Deposits ◽  
Stage Of Development ◽  
Geological Conditions ◽  
Methodological Approaches ◽  
The Cost

The importance of cost estimation of mineral resources in modern economic theory is noted in the article. It is noted that all currently existing methodical and methodological approaches to the valuation of minerals by their economic nature are in fact an analysis of the economic feasibility of realization of investment projects for the development of deposits, which actually answers the question: is the investment project for the development of the field economically viable. Based on the analysis of literary sources, it is established that at the present stage of development of the world economy, the interest in the economic evaluation of the efficiency of development of mineral resources is not waning. However, methodological approaches are different and there is still no unity in them. Experts point out that the current methods require improvement due to the low accuracy of calculations, since the size of the cost estimate depends on the amount of rental payments for the use of mineral resources in mining and the starting price of the sale of a special permit for the development of deposits at auction. For the first time in the economic theory economics, a graphoanalytic method for the cost estimation of mineral deposits has been proposed. The features of this methodological approach based on integral calculus, including the integration of continuous functions, as well as the method of discounting cash flows with simultaneous consideration of the life cycle scheme of deposits, namely mining and geological conditions of mining are opened. The step-by-step sequence of realization of the proposed method is resulted. It is stated that this approach will allow to obtain a more exact cost estimate of a deposit or subsoil by taking into account the following factors: the life of the deposit, the market conditions of the mineral resources, capital and current expenses connected with extraction of minerals and costs of the subsoil user in the post-mining a period of time related to the closure of mines and quarries and the reclamation of disturbed lands formed during the extraction of minerals.

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