This page has only limited features, please log in for full access.
Liquid-liquid phase flow in pipes merits further investigation as a challenging issue that has very rich physics and is faced in everyday applications. It is the main problem challenging the fluid flow mechanism in the oil and gas industry. The pressure gradient of liquid flow and flow pattern are still the topics of numerous research projects. In this paper, the emphasis is on further investigation to research the flow pattern, water holdup (HW), and pressure decrease for vertical, horizontal, and inclined flow directions of oil and water flows. Test section lines of 4.19-in. (106.426 mm) inner diameter (ID) and 5-m horizontal, 5-m inclined, and 5-m vertical test sections were serially connected. The experiments were conducted at 40°C using 2-cp viscosity oil and tap water, and oil density of 850 kg/m3, at the standard conditions. Fifty experiments were executed at 250 kPa at the multiphase flow test facility, with horizontal, upward (0.6° and 4°), downward (−0.6° and −4°) hilly terrain and vertical pipes. The oil and water superficial velocities were changed between 0.03 and 2 m/s. This evidence was obtained using video recordings; the flow patterns were observed, and the selection of each flow pattern was depicted for each condition. For horizontal and inclined flow, new flow patterns were documented (e.g., oil transfer in a line forms at the top of the pipeline, typically at high water rate, and water transfer at the lower part of the pipe at a high oil rate). The data were taken at each flow condition, resulting in new holdup and pressure drop. The results show that the flow rate and the pipe inclination angle have major impacts on the holdup and pressure drop performances. In the vertical flow, a clear peak was demonstrated by experiments after the superficial oil velocity reached a certain value. This peak is known as phase inversion point, where after this peak, the pressure starts declining as the superficial oil velocity increases. Also, slippage has been observed after varying inlet oil flow rates between the two phases. The experiments showed that with minor alteration in the inclination angle, the slippage was significantly changed. This study presented new experimental results (measured mainly at horizontal, inclined, and vertical flow conditions) of HW, flow pattern, and pressure drop. These findings are key evidence of the evolving oil-water and flowline estimate models.
Tarek Ganat; Meftah Hrairi; Raoof Gholami; Taha Abouargub; Eghbal Motaei. Experimental Investigation of Oil-Water Two-Phase Flow in Horizontal, Inclined, and Vertical Large-Diameter Pipes: Determination of Flow Patterns, Holdup, and Pressure Drop. SPE Production & Operations 2021, 1 -16.
AMA StyleTarek Ganat, Meftah Hrairi, Raoof Gholami, Taha Abouargub, Eghbal Motaei. Experimental Investigation of Oil-Water Two-Phase Flow in Horizontal, Inclined, and Vertical Large-Diameter Pipes: Determination of Flow Patterns, Holdup, and Pressure Drop. SPE Production & Operations. 2021; ():1-16.
Chicago/Turabian StyleTarek Ganat; Meftah Hrairi; Raoof Gholami; Taha Abouargub; Eghbal Motaei. 2021. "Experimental Investigation of Oil-Water Two-Phase Flow in Horizontal, Inclined, and Vertical Large-Diameter Pipes: Determination of Flow Patterns, Holdup, and Pressure Drop." SPE Production & Operations , no. : 1-16.
In the last three decades, smart materials have become popular. The piezoelectric materials have shown key characteristics for engineering applications, such as in sensors and actuators for industrial use. Because of their excellent mechanical-to-electrical and vice versa energy conversion properties, piezoelectric materials with high piezoelectric charge and voltage coefficient have been tested in renewable energy applications. The fundamental component of the energy harvester is the piezoelectric material, which, when subjected to mechanical vibrations or applied stress, induces the displaced ions in the material and results in a net electric charge due to the dipole moment of the unit cell. This phenomenon builds an electric potential across the material. In this review article, a detailed study focused on the piezoelectric energy harvesters (PEH’s) is reported. In addition, the fundamental idea about piezoelectric materials, along with their modeling for various applications, are detailed systematically. Then a summary of previous studies based on PEH’s other applications is listed, considering the technical aspects and methodologies. A discussion has been provided as a critical review of current challenges in this field. As a result, this review can provide a guideline for the scholars who want to use PEH’s for their research.
Abdul Aabid; Abdul Raheman; Yasser Ibrahim; Asraar Anjum; Meftah Hrairi; Bisma Parveez; Nagma Parveen; Jalal Mohammed Zayan. A Systematic Review of Piezoelectric Materials and Energy Harvesters for Industrial Applications. Sensors 2021, 21, 4145 .
AMA StyleAbdul Aabid, Abdul Raheman, Yasser Ibrahim, Asraar Anjum, Meftah Hrairi, Bisma Parveez, Nagma Parveen, Jalal Mohammed Zayan. A Systematic Review of Piezoelectric Materials and Energy Harvesters for Industrial Applications. Sensors. 2021; 21 (12):4145.
Chicago/Turabian StyleAbdul Aabid; Abdul Raheman; Yasser Ibrahim; Asraar Anjum; Meftah Hrairi; Bisma Parveez; Nagma Parveen; Jalal Mohammed Zayan. 2021. "A Systematic Review of Piezoelectric Materials and Energy Harvesters for Industrial Applications." Sensors 21, no. 12: 4145.
With the breadth of applications and analysis performed over the last few decades, it would not be an exaggeration to call piezoelectric materials “the top of the crop” of smart materials. Piezoelectric materials have emerged as the most researched materials for practical applications among the numerous smart materials. They owe it to a few main reasons, including low cost, high bandwidth of service, availability in a variety of formats, and ease of handling and execution. Several authors have used piezoelectric materials as sensors and actuators to effectively control structural vibrations, noise, and active control, as well as for structural health monitoring, over the last three decades. These studies cover a wide range of engineering disciplines, from vast space systems to aerospace, automotive, civil, and biomedical engineering. Therefore, in this review, a study has been reported on piezoelectric materials and their advantages in engineering fields with fundamental modeling and applications. Next, the new approaches and hypotheses suggested by different scholars are also explored for control/repair methods and the structural health monitoring of engineering structures. Lastly, the challenges and opportunities has been discussed based on the exhaustive literature studies for future work. As a result, this review can serve as a guideline for the researchers who want to use piezoelectric materials for engineering structures.
Abdul Aabid; Bisma Parveez; Abdul Raheman; Yasser Ibrahim; Asraar Anjum; Meftah Hrairi; Nagma Parveen; Jalal Mohammed Zayan. A Review of Piezoelectric Material-Based Structural Control and Health Monitoring Techniques for Engineering Structures: Challenges and Opportunities. Actuators 2021, 10, 101 .
AMA StyleAbdul Aabid, Bisma Parveez, Abdul Raheman, Yasser Ibrahim, Asraar Anjum, Meftah Hrairi, Nagma Parveen, Jalal Mohammed Zayan. A Review of Piezoelectric Material-Based Structural Control and Health Monitoring Techniques for Engineering Structures: Challenges and Opportunities. Actuators. 2021; 10 (5):101.
Chicago/Turabian StyleAbdul Aabid; Bisma Parveez; Abdul Raheman; Yasser Ibrahim; Asraar Anjum; Meftah Hrairi; Nagma Parveen; Jalal Mohammed Zayan. 2021. "A Review of Piezoelectric Material-Based Structural Control and Health Monitoring Techniques for Engineering Structures: Challenges and Opportunities." Actuators 10, no. 5: 101.
Active repair of a damaged structure using piezoelectric (PZT) actuators has played a significant role during the last two decades in reducing crack damage propagation in structures due to its electro-mechanical effect. Similarly, passive repair of damaged structures using composite materials has been widely used in recent years, and it has been divided into many types. In this paper, the hybrid repair of center-cracked plate using PZT actuators at the front of a plate and a composite patch at the back of the plate is analytically and numerically investigated. First, the solution is obtained from Rose's equations for the center-cracked plate integrated with a composite patch and a passive PZT actuator under uniform uniaxial load. Second, the stress intensity factor (SIF) for a center-cracked plate due to stress produced by a PZT actuator is analytically modeled using the weight functions method. The superposition principle is then used to superimpose the aforementioned solutions in order to yield the PZT actuator and composite patch's hybrid stress intensity factor for the center-cracked plate. Finally, the proposed analytical method was verified using the finite element method. The results demonstrate low relative errors between the analytical and the FE of below 5% in all the cases studied in this paper.
Abdul Aabid; Meftah Hrairi; Ahmed Abuzaid; Jaffar Syed Mohamed Ali. Estimation of stress intensity factor reduction for a center-cracked plate integrated with piezoelectric actuator and composite patch. Thin-Walled Structures 2020, 158, 107030 .
AMA StyleAbdul Aabid, Meftah Hrairi, Ahmed Abuzaid, Jaffar Syed Mohamed Ali. Estimation of stress intensity factor reduction for a center-cracked plate integrated with piezoelectric actuator and composite patch. Thin-Walled Structures. 2020; 158 ():107030.
Chicago/Turabian StyleAbdul Aabid; Meftah Hrairi; Ahmed Abuzaid; Jaffar Syed Mohamed Ali. 2020. "Estimation of stress intensity factor reduction for a center-cracked plate integrated with piezoelectric actuator and composite patch." Thin-Walled Structures 158, no. : 107030.
The repair of aircraft structures using composite material patches are well known in aerospace industries. In the present work composite patch bonded with a superglue over a cracked rectangular plate under uniform uniaxial tensile stress is considered. A three-dimensional finite element method was used to define the stress intensity factor for a repaired plate at mode-I crack propagation. Later, the design of experiments method was used to investigate the parametric effect on repair structure in order to achieve the optimum solution. The size and mechanical properties of the adhesive bond and composite patch that affect the repair quality are considered as the parameters for reduction in stress intensity factor. The outcome of this work will serve as a guideline for designer to improve the repair quality and durability.
Abdul Aabid; Meftah Hrairi; Jaffar Syed Mohamed Ali. Optimization of composite patch repair for center-cracked rectangular plate using design of experiments method. Materials Today: Proceedings 2020, 27, 1713 -1719.
AMA StyleAbdul Aabid, Meftah Hrairi, Jaffar Syed Mohamed Ali. Optimization of composite patch repair for center-cracked rectangular plate using design of experiments method. Materials Today: Proceedings. 2020; 27 ():1713-1719.
Chicago/Turabian StyleAbdul Aabid; Meftah Hrairi; Jaffar Syed Mohamed Ali. 2020. "Optimization of composite patch repair for center-cracked rectangular plate using design of experiments method." Materials Today: Proceedings 27, no. : 1713-1719.
Crack propagation until fracture is an important criterion to predict a structure‘s service life. In order to increase the latter, the cracked component needs to be repaired or replaced. In the present study, a finite element analysis has been carried out to investigate the effects of adhesive thickness, patch thickness and crack length on the passive repair performance of a center-cracked rectangular aluminum plate under mode-I loading condition using an ANSYS package. A comprehensive parametric study shows that the stress intensity factor is influenced by the patch thickness, patch size, adhesive material, and adhesive thickness. ABSTRAK: Penyebaran retak sehingga patah adalah kriteria penting bagi menjangka hayat struktur. Bagi memanjangkan jangka hayat struktur, komponen keretakan perlu dibaik pulih atau diganti. Kajian ini telah menjalankan analisis elemen tak terhingga bagi mengetahui kesan ketebalan pelekat, ketebalan tampalan dan panjang retak pada bahagian keretakan tengah plat petak aluminium yang dibaiki secara pasif, menggunakan pakej ANSYS di bawah beban mod-I. Kajian parametrik yang menyeluruh menunjukkan faktor tekanan intensif dipengaruhi oleh ketebalan tampalan, saiz tampalan, bahan pelekat dan ketebalan pelekat.
Abdul Aabid; Meftah Hrairi; Jaffar Syed Mohammed Ali; Ahmed Abuzaid. EFFECT OF BONDED COMPOSITE PATCH ON THE STRESS INTENSITY FACTORS FOR A CENTER-CRACKED PLATE. IIUM Engineering Journal 2019, 20, 211 -221.
AMA StyleAbdul Aabid, Meftah Hrairi, Jaffar Syed Mohammed Ali, Ahmed Abuzaid. EFFECT OF BONDED COMPOSITE PATCH ON THE STRESS INTENSITY FACTORS FOR A CENTER-CRACKED PLATE. IIUM Engineering Journal. 2019; 20 (2):211-221.
Chicago/Turabian StyleAbdul Aabid; Meftah Hrairi; Jaffar Syed Mohammed Ali; Ahmed Abuzaid. 2019. "EFFECT OF BONDED COMPOSITE PATCH ON THE STRESS INTENSITY FACTORS FOR A CENTER-CRACKED PLATE." IIUM Engineering Journal 20, no. 2: 211-221.
The large volume and high salinity of produced water (PW) could pose severe environmental impacts. This paper presents the laboratory results on PW from G oil field, located in North Africa, and on groundwater samples from nearby freshwater wells, in order to best comprehend the chemical composition of PW and to evaluate their potential impact on the surrounding environment of this oil field. Such a sizeable data set can make it difficult to integrate, interpret and represent the results. Thus, multivariate statistical techniques were used in the usefulness evaluation of geochemical groundwater control process classification and identification. Principal component analysis of produced water identified three components: the first being a salinization factor that accounted for 53.6% of the overall variance; the second accounted for 24.3% of overall variance and was mostly dictated by scale forming potential; and the third component (12.3% of total variance) representing the quality of the water formed by the rock water interaction. The aforementioned components demonstrated that the quality of discharged produced water didn’t meet national or international standards. For the groundwater analysis, two principal components/clusters were identified. The first one (69.6% of total variance) represented the hardness and salinity of the water, and the second one (18.4% of total variance) can be regarded as the overall effect of weathering and interactions between water and rock on the groundwater quality factor in general. The analysis did not show any contamination in groundwater at the G oil field and in the nearby farms water wells.
T. A. Ganat; M. Hrairi; M. E. Mohyaldinn. Experimental study to evaluate the environmental impacts of disposed produced water on the surrounding ecosystems. International Journal of Environmental Science and Technology 2019, 17, 1439 -1454.
AMA StyleT. A. Ganat, M. Hrairi, M. E. Mohyaldinn. Experimental study to evaluate the environmental impacts of disposed produced water on the surrounding ecosystems. International Journal of Environmental Science and Technology. 2019; 17 (3):1439-1454.
Chicago/Turabian StyleT. A. Ganat; M. Hrairi; M. E. Mohyaldinn. 2019. "Experimental study to evaluate the environmental impacts of disposed produced water on the surrounding ecosystems." International Journal of Environmental Science and Technology 17, no. 3: 1439-1454.
The accurate estimation of pressure drop during multiphase fluid flow in vertical pipes has been widely recognized as a critical problem in oil wells completion design. The flow of fluids through the vertical tubing strings causes great losses of energy through friction, where the value of this loss depends on fluid flow viscosity and the size of the conduit. A number of friction factor correlations, which have acceptably accurate results in large diameter pipes, are significantly in error when applied to smaller diameter pipes. Normally, the pressure loss occurs due to friction between the fluid flow and the pipe walls. The estimation of the pressure gradients during the multiphase flow of fluids is very complex due to the variation of many fluid parameters along the vertical pipe. Other complications relate to the numerous flow regimes and the variabilities of the fluid interfaces involved. Accordingly, knowledge about pressure drops and friction factors is required to determine the fluid flow rate of the oil wells. This paper describes the influences of the pressure drop on the measurement of the fluid flow by estimating the friction factor using different empirical friction correlations. Field experimental work was performed at the well site to predict the fluid flow rate of 48 electrical submersible pump (ESP) oil wells, using the newly developed mathematical model. Using Darcy and Colebrook friction factor correlations, the results show high average relative errors, exceeding ±18.0%, in predicted liquid flow rate (oil and water). In gas rate, more than 77% of the data exceeded ±10.0% relative error to the predicted gas rate. For the Blasius correlation, the results showed the predicted liquid flow rate was in agreement with measured values, where the average relative error was less than ±18.0%, and for the gas rate, 68% of the data showed more than ±10% relative error.
Tarek A. Ganat; Meftah Hrairi. Gas–Liquid Two-Phase Upward Flow through a Vertical Pipe: Influence of Pressure Drop on the Measurement of Fluid Flow Rate. Energies 2018, 11, 2937 .
AMA StyleTarek A. Ganat, Meftah Hrairi. Gas–Liquid Two-Phase Upward Flow through a Vertical Pipe: Influence of Pressure Drop on the Measurement of Fluid Flow Rate. Energies. 2018; 11 (11):2937.
Chicago/Turabian StyleTarek A. Ganat; Meftah Hrairi. 2018. "Gas–Liquid Two-Phase Upward Flow through a Vertical Pipe: Influence of Pressure Drop on the Measurement of Fluid Flow Rate." Energies 11, no. 11: 2937.
This article proposes an alternative model for active repair for an edge-cracked plate with adhesively bonded piezoelectric actuator. It computes the Mode-I stress intensity factor (SIF) produced by the piezoelectric actuators using appropriate derived geometrical weight functions. Furthermore, this article presents an experimental study to verify the proposed analytical model and the finite element analysis using ANSYS software. Therefore, the analytical, finite element and experimental results for Mode-I opening of the crack conditions are demonstrated. Parametric analysis to understand the influence and to study the efficiency of the piezoelectric actuator on mitigation of the Mode-I SIF was conducted. The obtained analytical solution is applicable in the calculation of Mode-I SIF with reasonable accuracy. The result indicated that the maximum reduction of SIF is achieved with the application of high external voltage and thin thickness actuator. The relative errors of the analytical model and the experimental results are less than 10% in all the cases studied in this article.
Ahmed Abuzaid; Meftah Hrairi; Msi Shaik Dawood. Experimental and numerical analysis of piezoelectric active repair of edge-cracked plate. Journal of Intelligent Material Systems and Structures 2018, 29, 3656 -3666.
AMA StyleAhmed Abuzaid, Meftah Hrairi, Msi Shaik Dawood. Experimental and numerical analysis of piezoelectric active repair of edge-cracked plate. Journal of Intelligent Material Systems and Structures. 2018; 29 (18):3656-3666.
Chicago/Turabian StyleAhmed Abuzaid; Meftah Hrairi; Msi Shaik Dawood. 2018. "Experimental and numerical analysis of piezoelectric active repair of edge-cracked plate." Journal of Intelligent Material Systems and Structures 29, no. 18: 3656-3666.
Tarek Al-Arbi Ganat; Meftah Hrairi. A new choke correlation to predict flow rate of artificially flowing wells. Journal of Petroleum Science and Engineering 2018, 171, 1378 -1389.
AMA StyleTarek Al-Arbi Ganat, Meftah Hrairi. A new choke correlation to predict flow rate of artificially flowing wells. Journal of Petroleum Science and Engineering. 2018; 171 ():1378-1389.
Chicago/Turabian StyleTarek Al-Arbi Ganat; Meftah Hrairi. 2018. "A new choke correlation to predict flow rate of artificially flowing wells." Journal of Petroleum Science and Engineering 171, no. : 1378-1389.
Active repairs using smart materials such as piezoelectric actuators can play a significant role in reducing the crack damage propagation in engineering structures. This study analytically and numerically investigated the active repair of center-cracked plates using piezoelectric actuators. First, the stress intensity factor (SIF) for a center-cracked plate due to stress produced by a piezoelectric actuator is analytically modeled. This analytical model is obtained by applying the method of weight functions. In the second step, the solution is found for the center-cracked plate due to external loading from known linear elastic fracture mechanics. These solutions are then superimposed, taking into account the superposition principle to yield the total stress intensity factor for the integrated piezoelectric actuator to the center-cracked plate. Finally, the proposed theoretical model is verified by finite element simulation. The results indicated that the relative errors of the analytical model and the FEA results are less than 5% in all the cases studied in this paper.
Ahmed Abuzaid; Meftah Hrairi; Mohd Sultan Ibrahim Bin Shaik Dawood. Evaluating the Reduction of Stress Intensity Factor in Center-Cracked Plates Using Piezoelectric Actuators. Actuators 2018, 7, 25 .
AMA StyleAhmed Abuzaid, Meftah Hrairi, Mohd Sultan Ibrahim Bin Shaik Dawood. Evaluating the Reduction of Stress Intensity Factor in Center-Cracked Plates Using Piezoelectric Actuators. Actuators. 2018; 7 (2):25.
Chicago/Turabian StyleAhmed Abuzaid; Meftah Hrairi; Mohd Sultan Ibrahim Bin Shaik Dawood. 2018. "Evaluating the Reduction of Stress Intensity Factor in Center-Cracked Plates Using Piezoelectric Actuators." Actuators 7, no. 2: 25.
An educational software which can aid students in the stress analysis of thin wall open sections made of composite material has been developed. The software enables students to easily calculate stresses in different shapes of thin wall open section and evaluate the stresses in each ply under shear and torsion. Results obtained through this software have been validated against ANSYS. The software is intended to be an educational tool for effective teaching and learning process on thin-walled structures, aircraft structures and composite structures courses.
Jaffar Syed Mohammed Ali; Meftah Hrairi; Masturah Mohamad. Stress Analysis of Thin-Walled Laminated Composite Beams under Shear and Torsion. International Journal of Engineering Materials and Manufacture 2018, 3, 9 -17.
AMA StyleJaffar Syed Mohammed Ali, Meftah Hrairi, Masturah Mohamad. Stress Analysis of Thin-Walled Laminated Composite Beams under Shear and Torsion. International Journal of Engineering Materials and Manufacture. 2018; 3 (1):9-17.
Chicago/Turabian StyleJaffar Syed Mohammed Ali; Meftah Hrairi; Masturah Mohamad. 2018. "Stress Analysis of Thin-Walled Laminated Composite Beams under Shear and Torsion." International Journal of Engineering Materials and Manufacture 3, no. 1: 9-17.
In this work, a numerical investigation was conducted to study the springback phenomena in the mechanical clinching process. The springback values were calculated using finite element simulations and it was found that these values depend strongly on the strength of the materials. A Taguchi optimization method was used to determine the optimal parameters affecting springback. However, in the case of materials with low tensile strength, determining parameters affecting springback becomes difficult. Implicit and explicit simulations of clinching joints using the springback analysis show that the distance between the joint sheets becomes almost zero after stress recovery.
Mohanna Eshtayeh; Meftah Hrairi; M.S.I Shaik Dawood. Numerical Investigation of Springback in Mechanical Clinching Process. International Journal of Engineering Materials and Manufacture 2017, 2, 86 -93.
AMA StyleMohanna Eshtayeh, Meftah Hrairi, M.S.I Shaik Dawood. Numerical Investigation of Springback in Mechanical Clinching Process. International Journal of Engineering Materials and Manufacture. 2017; 2 (4):86-93.
Chicago/Turabian StyleMohanna Eshtayeh; Meftah Hrairi; M.S.I Shaik Dawood. 2017. "Numerical Investigation of Springback in Mechanical Clinching Process." International Journal of Engineering Materials and Manufacture 2, no. 4: 86-93.
The term 'survival analysis' has been used in a broad sense to describe collection of statistical procedures for data analysis. In this case, outcome variable of interest is time until an event occurs where the time to failure of a specific experimental unit might be censored which can be right, left, interval, and Partly Interval Censored data (PIC). In this paper, analysis of this model was conducted based on parametric Cox model via PIC data. Moreover, several imputation techniques were used, which are: midpoint, left & right point, random, mean, and median. Maximum likelihood estimate was considered to obtain the estimated survival function. These estimations were then compared with the existing model, such as: Turnbull and Cox model based on clinical trial data (breast cancer data), for which it showed the validity of the proposed model. Result of data set indicated that the parametric of Cox model proved to be more superior in terms of estimation of survival functions, likelihood ratio tests, and their P-values. Moreover, based on imputation techniques; the midpoint, random, mean, and median showed better results with respect to the estimation of survival function.
Abdallah Zyoud; F. A. M Elfaki; Meftah Hrairi. Parametric Model Based On Imputations Techniques for Partly Interval Censored Data. Journal of Physics: Conference Series 2017, 949, 012002 .
AMA StyleAbdallah Zyoud, F. A. M Elfaki, Meftah Hrairi. Parametric Model Based On Imputations Techniques for Partly Interval Censored Data. Journal of Physics: Conference Series. 2017; 949 (1):012002.
Chicago/Turabian StyleAbdallah Zyoud; F. A. M Elfaki; Meftah Hrairi. 2017. "Parametric Model Based On Imputations Techniques for Partly Interval Censored Data." Journal of Physics: Conference Series 949, no. 1: 012002.
The main objective in structural health monitoring is to keep track of the changes in the dynamic characteristics of the structural system in order both to detect and locate the damage, and to make a decision automatically whether the damage is in dangerous level for the structure or not. In particular, electromechanical impedance (EMI) techniques give simple and low cost solutions for detecting damage in different structures. When it is question of damage localization, the simple analysis of the EMIs fails to furnish enough information. In this paper, an extreme learning machine (ELM) based algorithm is developed for estimating the damage location by using piezoelectric sensors data. The model is trained on simulation generated data and tested on experiments for estimating the damage location by using piezoelectric sensors data. The work’s numerical results have been confirmed either experimentally using laboratory equipment or by employing results available in the open literature and a good agreement has been observed. Experimental results show that ELM can be used as a tool to predict of a single damage in structures. An overall accuracy of 84.5% is achieved with best accuracy of 95%.
M. Djemana; M. Hrairi; Y. Al Jeroudi. Using Electromechanical Impedance and Extreme Learning Machine to Detect and Locate Damage in Structures. Journal of Nondestructive Evaluation 2017, 36, 39 .
AMA StyleM. Djemana, M. Hrairi, Y. Al Jeroudi. Using Electromechanical Impedance and Extreme Learning Machine to Detect and Locate Damage in Structures. Journal of Nondestructive Evaluation. 2017; 36 (2):39.
Chicago/Turabian StyleM. Djemana; M. Hrairi; Y. Al Jeroudi. 2017. "Using Electromechanical Impedance and Extreme Learning Machine to Detect and Locate Damage in Structures." Journal of Nondestructive Evaluation 36, no. 2: 39.
In this paper, the effect of piezoelectric actuators placed above a circular hole of a rectangular plate subjected to uniform uniaxial tension is studied. The core idea is to investigate the stress (compression/tension) produced by the piezoelectric actuators on the stress distribution around the hole and along the width of the host plate. For this purpose, Finite Element Analysis (FEA) was carried out through parametric study in ANSYS software. The results demonstrated that the positive electric field would decrease and change the state of the stress distribution along the width of the host plate in contrast to the negative applied electric filed which increases the stress distribution smoothly without affecting its behaviour. The results also indicated that the reduction of the stress concentration factor increases with the decrease of the ratio (D/W) for the same applied positive electric field.
Ahmed Abuzaid; Meftah Hrairi; M.S.I. Shaik Dawood. Estimation of Stress Concentration Factor of Plate with Hole using Piezoelectric Actuator and Finite Element Method. IOP Conference Series: Materials Science and Engineering 2017, 184, 12064 .
AMA StyleAhmed Abuzaid, Meftah Hrairi, M.S.I. Shaik Dawood. Estimation of Stress Concentration Factor of Plate with Hole using Piezoelectric Actuator and Finite Element Method. IOP Conference Series: Materials Science and Engineering. 2017; 184 ():12064.
Chicago/Turabian StyleAhmed Abuzaid; Meftah Hrairi; M.S.I. Shaik Dawood. 2017. "Estimation of Stress Concentration Factor of Plate with Hole using Piezoelectric Actuator and Finite Element Method." IOP Conference Series: Materials Science and Engineering 184, no. : 12064.
A solar assisted heat pump (SAHP) system is considered in this study where space cooling, water heating, drying and desalination are carried out using solar energy, ambient energy and the waste heat available from air conditioning system. The integration of different applications with SAHP system leads to many benefits, but the most significant is the energy conservation issue where the prices of fossil fuels are increasing. In recent years, researches have been conducted worldwide to improve the performance of these systems. These systems usually use synthetic refrigerant, such as R134a, which contributes to many atmospheric problems. Currently, embracing natural refrigerants, such as, carbon dioxide in SAHP has become a trend specifically after Kyoto agreement to reduce global warming and improve the performance of SAHP systems. In this paper, comparative study using R134a and R744 in SAHP systems have been considered. The comparison includes the most significant results of previous work relevant to this issue, and the thermo physical properties of the two refrigerants when used in SAHP.
Y. Baradey; M.N.A. Hawlader; A.F. Ismail; Meftah Hrairi. Comparative Study of R134a and R744 Driven Solar Assisted Heat Pump Systems for Different Applications. IOP Conference Series: Materials Science and Engineering 2017, 184, 012060 .
AMA StyleY. Baradey, M.N.A. Hawlader, A.F. Ismail, Meftah Hrairi. Comparative Study of R134a and R744 Driven Solar Assisted Heat Pump Systems for Different Applications. IOP Conference Series: Materials Science and Engineering. 2017; 184 (1):012060.
Chicago/Turabian StyleY. Baradey; M.N.A. Hawlader; A.F. Ismail; Meftah Hrairi. 2017. "Comparative Study of R134a and R744 Driven Solar Assisted Heat Pump Systems for Different Applications." IOP Conference Series: Materials Science and Engineering 184, no. 1: 012060.
Nowadays commercial and military aircrafts are increasingly using composite materials to take advantage of their excellent specific strength and stiffness properties but impacts on composites due to bird-strike, hail-storm cause barely visible impact damage (BVID) that underscores the need for robust structural health monitoring methods. Hence, damage identification in composite materials is a widely researched area that has to deal with problems coming from the anisotropic nature of composites and the fact that much of the damage occurs beneath the top surface of the laminate. This paper focuses on understanding self-sensing piezoelectric wafer active sensors (PWAS) to conduct electromechanical impedance (EMI) in glass fibre reinforced polymer composite to perform structural health monitoring. With the aid of a 3D ANSYS finite element model, an analysis of different techniques for the detection of position and size of a delamination in a composite structure using piezoelectric patches had been performed. The real part of the impedance is used because it is known to be more reactive to damage or changes in the structure's integrity and less sensitive to ambient temperature changes compared to the imaginary part. Comparison with experimental results is presented to validate the FE results. The experimental setup utilizes as its main apparatus an impedance analyser HP4194 that reads the in-situ EMI of PWAS bonded to the monitored composite structure. A good match between experimental and numerical results has been observed for low and high frequencies. The analysis in this paper provides necessary basis for delamination detection in composite structures using EMI technique
M Djemana; Meftah Hrairi. Impedance Based Detection of Delamination in Composite Structures. IOP Conference Series: Materials Science and Engineering 2017, 184, 12058 .
AMA StyleM Djemana, Meftah Hrairi. Impedance Based Detection of Delamination in Composite Structures. IOP Conference Series: Materials Science and Engineering. 2017; 184 ():12058.
Chicago/Turabian StyleM Djemana; Meftah Hrairi. 2017. "Impedance Based Detection of Delamination in Composite Structures." IOP Conference Series: Materials Science and Engineering 184, no. : 12058.
The significant challenge in the oil and gas industry is the concurrent measurement of commingled gas, oil and water production, either using three phase test separator or multiphase flow meter (MPFM). A major issue in these applications is the uncertainty of the measurements, due to different measurement operations conditions. A new computational approach has been generated to estimate oil well flow rate of 48 oil wells using Electrical Submersible pump (ESP) from D, G, and W oil fields located in North Africa. The idea is to close the wellhead wing valve and the ESP is kept running normally and the wellhead flowing pressure before shut-in the well and the build-up of wellhead flowing pressure after shut-in the well are measured. OLGA software has been used to make comparison with multiphase flow model available in the OLGA software against each nominated ESP oil well parameters obtained from measured field data. The objective was to verify the obtained shut-in wellhead pressure after closing the choke wing valve (WHPa) from the measured field data with the obtained shut-in wellhead pressure valve from the simulation model. In this paper the simulation results showed that the estimated WHPa are in agreement with the measured WHPa. The relative errors for individual oil field are within accuracy standard specification (typically +/- 10%). The overall relative errors are low and within acceptable uncertainty range, where the aggregate relative error for all wells was less than +/-4% which is considered acceptable. Therefore, the results have demonstrated that the new computational method can work under ESP oil wells conditions and has the ability to perform accurate results even when closing the wellhead wing valve for short time span.
T A Ganat; Meftah Hrairi; Mna Hawlader. Validation of ESP Oil Wells Measured Parameters Using Simulation Olga Software. IOP Conference Series: Materials Science and Engineering 2017, 184, 12057 .
AMA StyleT A Ganat, Meftah Hrairi, Mna Hawlader. Validation of ESP Oil Wells Measured Parameters Using Simulation Olga Software. IOP Conference Series: Materials Science and Engineering. 2017; 184 ():12057.
Chicago/Turabian StyleT A Ganat; Meftah Hrairi; Mna Hawlader. 2017. "Validation of ESP Oil Wells Measured Parameters Using Simulation Olga Software." IOP Conference Series: Materials Science and Engineering 184, no. : 12057.
Active repairs using piezoelectric actuators can play a significant role in reducing the crack damage propagation in thin plate structures. Mode-I crack opening displacement is the most predominant one in tension, and it is responsible for the failure which in turn affects the load carrying capability of the cracked structure. In addition, there are limited studies that investigated the effect of the piezoelectric actuator over mode-I active repair. In this study, the mode-I stress intensity factor for a plate with a center crack, and a bonded piezoelectric actuator was modeled using the linear elastic fracture mechanics. For this, an analytical closed-form solution is developed using the virtual crack closure technique taking into account mode-I as the only effective mode, coupling effects of the piezoelectric patch, and the singular stress at the crack tip. In addition, the total stress intensity factor was obtained by the superposition of the stress intensity factor obtained from the stresses produced by the piezoelectric actuators on the crack surfaces as the only external loads on the cracked plate and the stress intensity factor due to the far-field tension load. The proposed analytical model for mode-I stress intensity factor was verified by a finite element–based approach using ANSYS finite element software. The results demonstrated a good agreement between the analytical and finite element models with a relative error of less than 4% in all the cases studied. The results illustrated that the piezoelectric patch is efficient in reducing stress intensity factor when an extension mode of the actuator is applied. However, applying a contraction mode of the piezoelectric actuators produced negative strain which increased the stress intensity factor and thus the severity of the cracked structure and could lead to damage propagation.
Ahmed Abuzaid; Meftah Hrairi; Msi Shaik Dawood. Modeling approach to evaluating reduction in stress intensity factor in center-cracked plate with piezoelectric actuator patches. Journal of Intelligent Material Systems and Structures 2016, 28, 1334 -1345.
AMA StyleAhmed Abuzaid, Meftah Hrairi, Msi Shaik Dawood. Modeling approach to evaluating reduction in stress intensity factor in center-cracked plate with piezoelectric actuator patches. Journal of Intelligent Material Systems and Structures. 2016; 28 (10):1334-1345.
Chicago/Turabian StyleAhmed Abuzaid; Meftah Hrairi; Msi Shaik Dawood. 2016. "Modeling approach to evaluating reduction in stress intensity factor in center-cracked plate with piezoelectric actuator patches." Journal of Intelligent Material Systems and Structures 28, no. 10: 1334-1345.