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RISS 인기검색어
- 검색키워드
- 저자 : Pasandideh, Seyed Hamid Reza (검색결과 4 건)
- 무료
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Gharaei, Abolfazl,Pasandideh, Seyed Hamid Reza Korean Institute of Industrial Engineers 2017 Industrial Engineeering & Management Systems Vol.16 No.3
The present paper focuses on modeling and optimizing a four-echelon integrated supply chain, which consists of a supplier, a producer, a wholesaler and multiple retailers. These echelons interact and agree with each other on having the same period length and stockpiles for each product to make an integrated formation for minimizing the total cost of chain. Resources follow normal distributions with known means and variances. In this regard, stochastic constraints on costs of procurement or production, space and order quantity are considered, and in this, there are several single-stage products considered in shortage condition. The objectives set in this piece are to find both the number of agreed optimum stockpile and agreed optimum period length with the purpose of minimizing the total inventory cost of the chain while the stochastic constraints are met. The model used to clarify the problem is nonlinear and large, and so, the sequential quadratic programming (SQP) developed as more effective algorithm with less iteration adopted for solving the recent convex nonlinear model. A numerical example is also solved to demonstrate the application of this model and to evaluate optimum performance of the newly developed SQP algorithm. The results of the sensitivity analysis illustrate that the intended SQP algorithm has excellent performance in terms of optimality for solving research nonlinear model.
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Aerodynamic shape study of supersonic surface to surface missiles with continuous flexible nose
Abbas Khalghani,Mahmoud Pasandideh-Fard,Mohamad Hasan Djavareshkian 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
The aerodynamic characteristics of nine configurations of supersonic continuous deflectable nose guided missiles have been investigated. The optimized geometry was achieved based on the accuracy of confliction with constant target in ground to ground mission. The studied configurations consist of a spherical nose tip, a tangent ogive, one set of stabilizing tail fines and a cylindrical body whose midsection is flexible to form an arc of a circle. So the cylindrical body consists of a fixed part in the vicinity of the nose, middle flexible part and main body with stabilizers. The effects of fixed length (Fix = 0, 1.5, 3Cal) and flexible length (Flex = 1, 2.5, 5Cal) parameters on the aerodynamics and flight dynamics of guided missile have been studied. A code has been developed to solve full Navier-Stokes equations using finite volume and Runge-Kutta time stepping techniques and modified Baldwin-Lomax turbulence model. Multi-block technique was also used to solve the main body and fin parts flow fields. Further, a 3 degree of freedom code along with a pure pursuit guidance subroutine was developed to compare planar flight dynamics of missiles. It was found that although the missiles with bigger lengths for fixed and flex parts show more maneuverability, but this is not favorable for all missile missions as sometimes it decreases the confliction accuracy. Flight dynamic analysis shows that a change in initial launch angle may shift the favorite configuration. This means only the aerodynamic defined aim functions cannot completely supersede flight dynamic analysis in geometric optimization. Further, the thrust vector moment is an important portion of total control moment as it enhances the hitting accuracy and also decreases the importance of geometry.
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Lift characteristics of pitching NACA0015 airfoil due to unsteady forced surface inflation
Ali Heydari,Mahmoud Pasandideh-Fard 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
The purpose of this work is to investigate the unsteady forced surface inflating (UFSI) effect on lift coefficient of a pitching airfoil. Thus, 2D unsteady compressible flow around a pitching airfoil is analyzed by means of coarse grid CFD (CGCFD) method and springdynamic grids network. At first to validate the code for moving boundary cases, the predicted lift coefficient of pitching airfoil is comparedwith experiments. Simultaneously, the CGCFD results are compared with the RANS simulation. Then UFSI is added to the pitchingairfoil. The effects of unsteady parameters such as the inflation amplitude and phase difference between pitching and inflation is investigatedon lift and pressure coefficients of pitching airfoil. According to the results, UFSI, with zero degree phase difference betweenpitching and inflation, help to postpone the dynamic stall.
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Four-Echelon Integrated Supply Chain Model with Stochastic Constraints Under Shortage Condition
Abolfazl Gharaei,Seyed Hamid Reza Pasandideh 대한산업공학회 2017 Industrial Engineeering & Management Systems Vol.16 No.3
The present paper focuses on modeling and optimizing a four-echelon integrated supply chain, which consists of a supplier, a producer, a wholesaler and multiple retailers. These echelons interact and agree with each other on having the same period length and stockpiles for each product to make an integrated formation for minimizing the total cost of chain. Resources follow normal distributions with known means and variances. In this regard, stochastic constraints on costs of procurement or production, space and order quantity are considered, and in this, there are several singlestage products considered in shortage condition. The objectives set in this piece are to find both the number of agreed optimum stockpile and agreed optimum period length with the purpose of minimizing the total inventory cost of the chain while the stochastic constraints are met. The model used to clarify the problem is nonlinear and large, and so, the sequential quadratic programming (SQP) developed as more effective algorithm with less iteration adopted for solving the recent convex nonlinear model. A numerical example is also solved to demonstrate the application of this model and to evaluate optimum performance of the newly developed SQP algorithm. The results of the sensitivity analysis illustrate that the intended SQP algorithm has excellent performance in terms of optimality for solving research nonlinear model.
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