The Assessment of microfacies and reservoir potential relationship (porosity and pore size) of the Sarvak Formation in SW Iran

Mirzaee Mahmoodabadi Reza 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.5

Bangestan Reservoir in Ahvaz Oil Field is one of the important carbonate reservoirs in Dezful Embayment in the southwest of Iran. This reservoir consists of Sarvak and Ilam formations. Core samples were used to study microfacies and to determine the relationship between microfacies and reservoir potential of Ahwaz oil field. To highlight pores and throats, Blue Dye Epoxy was injected. According to petrographic study, 10 microfacies and 8 types of porosity were recognized. Our observation suggests a significant relationship between pore types and pore sizes to porethroats. The relationship between petrographic porosity and laboratory measurement of porosity was also investigated, that pores had undergone more porosity. Correlation coefficient of petrographic porosity with that of laboratory measurement porosity was calculated and poor correlation was found. The reason for this was the elimination of pores smaller than 1 μm by the petrographic analysis software and the elimination of extremely small pores (0.005 μm) in the helium injection method. Correlation in grainstone and packstone microfacies was stronger. In analyzing the relationship between throats and pores to microfacies, no significant relationship was observed, because of the intensity of diagenetic processes and destruction of the primary sedimentary texture. Generally, it was found the pore classification can be used in studies on pore sizes, flow units, and even rock types. Because of the significant relationship between pore types and pore-throat sizes, and finally because of the direct relationship of these sizes to petrophysical properties (porosity, permeability, and capillary pressure).

Reactor core analysis through the SP₃-ACMFD approach. Part I: Static solution

Mirzaee, Morteza Khosravi,Zolfaghari, A.,Minuchehr, A. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.2

The present work proposes a solution to the static Boltzmann transport equation approximated by the simplified P₃ (SP₃) on angular, and the analytic coarse mesh finite difference (ACMFD) for spatial variables. Multi-group SP₃-ACMFD equations in 3D rectangular geometry are solved using the GMRES solution technique. As the core time dependent analysis necessitates the solution of an eigenvalue problem for an initial condition, this work is hence devoted to development and verification of the proposed static SP₃-ACMFD solver. A 3D multi-group static diffusion solver is also developed as a byproduct of this work to assess the improvement achieved using the SP₃ technique. Static results are then compared against transport benchmarks to assess the proximity of SP₃-ACMFD solutions to their full transport peers. Results prove that the approach can be considered as an acceptable interim approximation with outputs superior to the diffusion method, close to the transport results, and with the computational costs less than the full transport approach. The work would be further generalized to time dependent solutions in Part II.

Reactor core analysis through the SP₃-ACMFD approach Part II: Transient solution

Mirzaee, Morteza Khosravi,Zolfaghari, A.,Minuchehr, A. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.2

In this part, an implicit time dependent solution is presented for the Boltzmann transport equation discretized by the analytic coarse mesh finite difference method (ACMFD) over the spatial domain as well as the simplified P₃ (SP₃) for the angular variable. In the first part of this work we proposed a SP₃-ACMFD approach to solve the static eigenvalue equations which provide the initial conditions for temp dependent equations. Having solved the 3D multi-group SP₃-ACMFD static equations, an implicit approach is resorted to ensure stability of time steps. An exponential behavior is assumed in transverse integrated equations to establish a relationship between flux moments and currents. Also, analytic integration is benefited for the time-dependent solution of precursor concentration equations. Finally, a multi-channel one-phase thermal hydraulic model is coupled to the proposed methodology. Transient equations are then solved at each step using the GMRES technique. To show the sufficiency of proposed transient SP₃-ACMFD approximation for a full core analysis, a comparison is made using transport peers as the reference. To further demonstrate superiority, results are compared with a 3D multi-group transient diffusion solver developed as a byproduct of this work. Outcomes confirm that the idea can be considered as an economic interim approach which is superior to the diffusion approximation, and comparable with transport in results.

Trajectory tracking and active vibration suppression of a smart Single-Link flexible arm using a composite control design

Mirzaee, E.,Eghtesad, M.,Fazelzadeh, S.A. Techno-Press 2011 Smart Structures and Systems, An International Jou Vol.7 No.2

This paper is concerned with the trajectory tracking and vibration suppression of a single-link flexible arm by using piezoelectric materials. The dynamics of a single flexible arm with PZT patches as sensor and actuator is derived using extended Hamilton's principle. Resulting equations show that the coupled beam dynamics including beam vibration and its rigid in-plane rotation takes place in two different time scales. By using singular perturbation theory, the system dynamics is divided into two subsystems. Then, a composite control scheme is elaborated that makes the orientation of the arm track a desired trajectory while suppressing its vibration. The proposed controller has two parts: one is a tracking controller designed for the slow (rigid) subsystem, and the other one is a stabilizing controller for the fast (flexible) subsystem. The outputs considered for the system are angular position of the hub and voltage of the sensor mounted on the structure. To avoid requiring further measurements of beam vibration and also angular velocity of the hub for the fast and slow control laws, respectively, two sliding mode observers for estimating the unknown states are also designed.

Simultaneous identification of damage in bridge under moving mass by Adjoint variable method

Mirzaee, Akbar,Abbasnia, Reza,Shayanfar, Mohsenali Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.4

In this paper, a theoretical and numerical study on bridge simultaneous damage detection procedure for identifying both the system parameters and input excitation mass, are presented. This method is called 'Adjoint Variable Method' which is an iterative gradient-based model updating method based on the dynamic response sensitivity. The main advantage of proposed method is inclusion of an analytical method to augment the accuracy and speed of the solution. Moving mass is a model which takes into account the inertia effects of the vehicle. This interaction model is a time varying system and proposed method is capable of detecting damage in this variable system. Robustness of proposed method is illustrated by correctly detection of the location and extension of predetermined single, multiple and random damages in all ranges of speed and mass ratio of moving vehicle. A comparison study of common sensitivity and proposed method confirms its efficiency and performance improvement in sensitivity-based damage detection methods. Various sources of errors including the effects of measurement noise and initial assumption error in stability of method are also discussed.

BESSEL MULTIPLIERS AND APPROXIMATE DUALS IN HILBERT C*-MODULES

Morteza Mirzaee Azandaryani 대한수학회 2017 대한수학회지 Vol.54 No.4

Two standard Bessel sequences in a Hilbert $C^\ast$-module are approximately duals if the distance (with respect to the norm) between the identity operator on the Hilbert $C^\ast$-module and the operator constructed by the composition of the synthesis and analysis operators of these Bessel sequences is strictly less than one. In this paper, we introduce $(a,m)$-approximate duality using the distance between the identity operator and the operator defined by multiplying the Bessel multiplier with symbol $m$ by an element $a$ in the center of the $C^\ast$-algebra. We show that approximate duals are special cases of $(a,m)$-approximate duals and we generalize some of the important results obtained for approximate duals to $(a,m)$-approximate duals. Especially we study perturbations of $(a,m)$-approximate duals and $(a,m)$-approximate duals of modular Riesz bases.

An Experimental Study on Impact Resistance of Different Layup Configuration of Fiber Metal Laminates

Mohsen Mirzaee Sisan,Reza Eslami-Farsani 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10

Fiber metal laminates (FMLs) are composed of thin metal sheets and fiber-reinforced composite layers. Comparedto monolithic aluminum alloys, FMLs combine lower density, higher fatigue resistance, and improved damage tolerance. Thepresent study aimed to investigate the low-velocity impact induced by drop-weight instrument and the tensile strength onvarious lay-up configurations of FMLs fabricated. FML samples were composed of two layers of aluminum 2024-T3 and twolayers of epoxy resin, which were reinforced with carbon fabric, glass fabric, and Kevlar fabric made in pairs. In addition,another type of FMLs was developed with carbon/Kevlar fabric under the same circumstances. Force-time histories of impactforces were recorded, and the damaged specimens were inspected using optical microscopy in terms of the impact side, nonimpactside, and cross-sectional side. Experimental results indicated that the maximum impact force corresponded to theFMLs that were composed of Kevlar fabric on the impact side and glass fabric on the non-impact side. In addition, thehighest tensile strength and Young's modulus among FMLs belonged to FML with Kevlar fabric and glass fabric.

Trajectory tracking and active vibration suppression of a smart Single-Link flexible arm using a composite control design

E. Mirzaee,M. Eghtesad,S.A. Fazelzadeh 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.7 No.2

This paper is concerned with the trajectory tracking and vibration suppression of a single-link flexible arm by using piezoelectric materials. The dynamics of a single flexible arm with PZT patches as sensor and actuator is derived using extended Hamilton’s principle. Resulting equations show that the coupled beam dynamics including beam vibration and its rigid in-plane rotation takes place in two different time scales. By using singular perturbation theory, the system dynamics is divided into two subsystems. Then, a composite control scheme is elaborated that makes the orientation of the arm track a desired trajectory while suppressing its vibration. The proposed controller has two parts: one is a tracking controller designed for the slow (rigid) subsystem, and the other one is a stabilizing controller for the fast (flexible) subsystem. The outputs considered for the system are angular position of the hub and voltage of the sensor mounted on the structure. To avoid requiring further measurements of beam vibration and also angular velocity of the hub for the fast and slow control laws, respectively, two sliding mode observers for estimating the unknown states are also designed.

A novel sensitivity method to structural damage estimation in bridges with moving mass

Akbar Mirzaee,Mohsenali Shayanfar,Reza Abbasnia 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.6

In this research a theoretical and numerical study on a bridge damage detection procedure is presented based on vibration measurements collected from a set of accelerometers. This method, referred to as “Adjoint Variable Method”, is a sensitivity-based finite element model updating method. The approach relies on minimizing a penalty function, which usually consists of the errors between the measured quantities and the corresponding predictions attained from the model. Moving mass is an interactive model and includes inertia effects between the model and mass. This interactive model is a time varying system and the proposed method is capable of detecting damage in this variable system. Robustness of the proposed method is illustrated by correct detection of the location and extension of predetermined single, multiple and random damages in all ranges of speed and mass ratio of moving vehicle. A comparative study on common sensitivity and the proposed method confirms its efficiency and performance improvement in sensitivity-based damage detection methods. In addition various possible sources of error, including the effects of measurement noise and initial assumption error in stability of method are also discussed.

Optimal Buyer Credit Arrangements for Chinese Procured Dam-building Projects: An Iranian Perspective

Ali Mohammad Mirzaee,M. Reza Hossieni,Igor Martek 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12

Dam-building projects in Iran procured under buyer credit arrangements from foreign providers experience high rates of construction stoppages. An understanding of the financial and technical issues that give rise to problems is needed. This study provides an analysis of internal and external factors impacting Iran’s bank-to-bank buyer credit-based dams procurement process. By way of TOWS matrix, optimal strategies in such procurement arrangements are identified. Data supporting the matrix are extracted through focus groups comprised of industry experts. Findings facilitating a better dams procurement process include: 1) formulation of an execution structure comprising comprehensive control, management, and implementation; 2) utilization of an omnibus buyer credit dispute review board involving financial, legal and technical representation; and 3) comprehensive stakeholder participation. Strategies identified are applicable at addressing ongoing challenges regarding off-shore dam project procurement, both from the viewpoint of host country and international provider.