A Novel Real-time Fuzzy Adaptive Auto-Tuning Scheme for Cascade PID Controllers

Ali Fadaei,Karim Salahshoor 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.5

This paper presents a novel fuzzy auto-tuning methodology to continuously adapt PID control actions without interrupting the normal process operation. New auto-tuning rules are introduced to schedule a gradual and guided activation of each individual P, I and D control mode in three adjustable functional control zones. An auto-scaling procedure has been incorporated to generalize the auto-tuning scheme to efficiently respond to any set-point change outside a pre-defined operating span. In contrast to existing auto-tuning algorithms, the proposed scheme is not an on-demand auto-tuning methodology and hence does not require alertness of an experienced engineer to initiate and supervise its initial operation in a separate commissioning identification pre-test. This interesting feature provides a new perspective on PID auto-tuning approaches. Performance of the proposed auto-tuning scheme is practically evaluated in a real pilot plant within a networked control system (NCS) configuration, realized by industrial Ethernet and Foundation Fieldbus technologies. An extensive series of test scenarios has been conducted to explore efficiency of the proposed auto-tuning methodology to cope with fixed and varying operating set-points under uncertain and variable network transmission time delays and external disturbance.

Mass transfer simulation of nanofiltration membranes for electrolyte solutions through generalized Maxwell-Stefan approach

Vahid Hoshyargar,Farzad Fadaei,Seyed Nezameddin Ashrafizadeh 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7

A comprehensive mathematical model is developed for simulation of ion transport through nanofiltration membranes. The model is based on the Maxwell-Stefan approach and takes into account steric, Donnan, and dielectric effects in the transport of mono and divalent ions. Theoretical ion rejection for multi-electrolyte mixtures was obtained by numerically solving the “hindered transport” based on the generalized Maxwell-Stefan equation for the flux of ions. A computer simulation has been developed to predict the transport in the range of nanofiltration, a numerical procedure developed linearization and discretization form of the governing equations, and the finite volume method was employed for the numerical solution of equations. The developed numerical method is capable of solving equations for multicomponent systems of n species no matter to what extent the system shows stiffness. The model findings were compared and verified with the experimental data from literature for two systems of Na2SO4+NaCl and MgCl2+NaCl. Comparison showed great agreement for different concentrations. As such, the model is capable of predicting the rejection of different ions at various concentrations. The advantage of such a model is saving costs as a result of minimizing the number of required experiments, while it is closer to a realistic situation since the adsorption of ions has been taken into account. Using this model, the flux of permeates and rejections of multi-component liquid feeds can be calculated as a function of membrane properties. This simulation tool attempts to fill in the gap in methods used for predicting nanofiltration and optimization of the performance of charged nanofilters through generalized Maxwell-Stefan (GMS) approach. The application of the current model may weaken the latter gap, which has arisen due to the complexity of the fundamentals of ion transport processes via this approach, and may further facilitate the industrial development of nanofiltration.

Biostratigraphy of Cenomanian succession in Zagros area (southwest of Iran)

Massih Afghah,Hamid R. Fadaei 한국지질과학협의회 2015 Geosciences Journal Vol.19 No.2

This study is focused on biozonation and biostratigraphic limits of two selected stratigraphic sections of the Sarvak Formation (Cenomanian) which are nominated Bavan and Kharameh (southwestern folded Zagros Mountain Ranges of Iran). Based on the vertical distribution of benthic and planktonic foraminifers, one biozone in Bavan area and three biozones in Kherameh stratigraphic section have established which are: Chrysalidina gradata- Cuneolina pavonia Assemblage zone (Upper Cenomanian) in Bavan section, and established biozones in Kherameh stratigraphic section from the base to the top consist of: 1) Praealveolina iberica-Praealveolina pennensis Assemblage zone (Lower Cenomanian), 2) Nezzazata conica-Nezzazata simplex Assemblage zone (Middle Cenomanian), 3) Calcisphaerula innominata-Heterohelix reussi-Heterohelix moremani Assemblage zone (Upper Cenomanian). New micropaleontologic data confirms well diversified and expanded of imperforate foraminifera in both studied stratigraphic sections. Well developed planktonic foraminifers in Kherameh stratigraphic column reflect transgression of sea-level rise during Upper Cenomanian.

Quantitative Structure Activity Relationship Prediction of Oral Bioavailabilities Using Support Vector Machine

Fatemi, Mohammad Hossein,Fadaei, Fatemeh Korean Chemical Society 2014 대한화학회지 Vol.58 No.6

A quantitative structure activity relationship (QSAR) study is performed for modeling and prediction of oral bioavailabilities of 216 diverse set of drugs. After calculation and screening of molecular descriptors, linear and nonlinear models were developed by using multiple linear regression (MLR), artificial neural network (ANN), support vector machine (SVM) and random forest (RF) techniques. Comparison between statistical parameters of these models indicates the suitability of SVM over other models. The root mean square errors of SVM model were 5.933 and 4.934 for training and test sets, respectively. Robustness and reliability of the developed SVM model was evaluated by performing of leave many out cross validation test, which produces the statistic of $Q^2_{SVM}=0.603$ and SPRESS = 7.902. Moreover, the chemical applicability domains of model were determined via leverage approach. The results of this study revealed the applicability of QSAR approach by using SVM in prediction of oral bioavailability of drugs.

Statistical Analysis of Magnetic Abrasive Finishing (MAF) On Surface Roughness

Mehrdad Givi,Alireza Fadaei Tehrani,Aminollah Mohammadi 한국소성가공학회 2010 기타자료 Vol.2010 No.6

Magnetic assisted finishing is one of the nontraditional methods of polishing that recently has been attractive for the researchers. This paper investigates the effects of some parameters such as rotational speed of the permanent magnetic pole, work gap between the permanent pole and the work piece, number of the cycles and the weight of the abrasive particles on aluminum surface plate finishing. The three levels full factorial method was used as the DOE technique (design of experiments) for studying the selected factors. Analysis of Variance (ANOVA) has been used to determine significant factors and also to obtain an equation based on data regression. Experimental results indicate that for a change in surface roughness ΔRa, number of cycles and working gap are found to be the most significant parameters followed by rotational speed and then weight of powders.

Modeling of P-ρ-T properties of ionic liquids using ISM equation of state: Application to pure component and binary mixtures

Mohammad Mehdi Papari,Sayed Mostafa Hosseini,Fatemeh Fadaei-Nobandegani,Jalil Moghadasi 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.11

Ihm-Song-Mason (ISM) equation of state (EOS) has been previously employed for modeling the volumetric properties of ionic liquids (ILs). The novelty of the present work is in replacing the macroscopic scaling constants with microscopic ones. Three temperature-dependent parameters that appeared in the EOS, which are universal functions of the reduced temperature, were determined using these new microscopic scaling constants. These parameters are the effective hard-sphere diameter (σ) and the non-bonded interaction energy between two spheres (ε). The present EOS is evaluated by examination of 3997 experimental density data points for five classes of ILs. The average absolute deviation (AAD) of the calculated densities from literature values was found to be of the order of 0.38%. Our calculations involved a broad range of temperature from 293 K to 472 K and pressures from 0.1MPa up to 200MPa. Another aspect of the present study is the extension of the proposed EOS to predict density of binary mixtures involving IL+ water and IL+ IL. In the case of binary mixtures, 898 data points were taken to assess the capability of the EOS. The overall AAD of the calculated mixture densities from the literature ones was within 0.43%.

An investigation on the improvement of neutron radiography system of the Tehran research reactor by using MCNPX simulations

Amini, Moharram,Zamzamian, Seyed Mehrdad,Fadaei, Amir Hossein,Gharib, Morteza,Feghhi, Seyed Amir Hosein Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10

Applying the available neutron flux for medical and industrial purposes is the most important application of research reactors. The neutron radiography system is used for non-destructive testing (NDT) of materials so that it is one of the main applications of nuclear research reactors. One of these research reactors is the 5 MW pool-type light water research reactor of Tehran (TRR). This work aims to investigate on materials and location of the beam tube (BT) of the TRR radiography system to improve the index parameters of BT. Our results showed that a through-type BT with 20 cm thick carbon neutron filter, 1.2 cm and 9.4 cm of the diameter of inlet (D₁) and output (D₂) BT, respectively gives thermal neutron flux almost 25.7, 5.6 and 1.1 times greater than the former design of the TRR (with D₁ = 1.8 cm and D₁ = 9.4 cm), previous design of the TRR with D₁ = 3 cm and D₁ = 9.4 cm, and another design with D₁ = 5 cm and D₁ = 9.4 cm, respectively. Therefore, the design proposed in this paper could be a better alternative to the current BT of the TRR.

Improving the Quality of Surface in Polishing Process with the Magnetic Abrasive Powder Polishing (MAPP) by Use of Ultrasonic Oscillation of Work-piece on a CNC Table

Saeed Mirian,Mohsen safavi,Alireza Fadaei,Mahmoud Salimi,Mahmoud Farzin 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.

In this research work, polishing inside, outside and over the cylindrical parts has been done by using a completely new and innovative method. The work-pieces have been placed on a two-axis Cartesian CNC Table for polishing operations. The Magnetic Rotary Head continuously changes its rotation direction from CW to CCW and CCW to CW and meanwhile the part begin to oscillate up-and-down under a High Frequency (20 kHz) conditions. The Frequency of changing direction From CW to CCW and CCW to CW is one of the important parameters in this method. This method is a kind of Ultrasonic Assisted Polishing (UAP) and novelty of this research work is combining this method with motion of work piece under CNC trajectory with continuously changing direction of Magnetic Rotary Head. Gap between Rotary Magnetic Polishing Head and the Work piece Surface can be controlled by a power transmission screw which operates in the direction of the vertical axis. Several experiments have proved high performance of this new proposed method in the process of polishing in short times.

The expression of IL-6Rα and Gp130 in fallopian tubes bearing an ectopic pregnancy

Elham Yousefian,Marefat Ghaffari Novin,Fateme Fadaei Fathabadi,Reza Mastery Farahani,Emadeddin Yazdani Kachouei 대한해부학회 2013 Anatomy & Cell Biology Vol.46 No.3

Women with tubal ectopic pregnancies have high levels of circulating interleukin 6 (IL-6). IL-6 treatment in vitro significantly reduces the ciliary activity of tubal epithelium. The effects of IL-6 on target cells occur via the formation of a high-affinity complex with its receptors IL-6Rα and glycoprotein 130 (Gp130). IL-6Rα is specifically expressed in the cilia of the epithelial cells. In this study, we performed a quantitative reverse transcriptase polymerase chain reaction to determine the mRNA expression of IL-6Rα and Gp130 in the fallopian tubes obtained from 12 women with ectopic pregnancies, 12 women with normal pregnancies, and 12 healthy nonpregnant women in the luteal phase of their menstrual cycle. Fallopian tubes were evaluated from specimens taken during tubal ligation in normal pregnancies and nonpregnant fertile women or during tubal surgery in ectopic pregnancies. We observed that IL-6Rα mRNA expression in fallopian tubes was increased in ectopic pregnancy compared with that in the midluteal phase. We also found that the Gp130 mRNA expression was significantly lower in fallopian tubes from ectopic pregnancies than in those from nonpregnant women during the midluteal phase of their menstrual cycle, although its expression was noticeably high in fallopian tubes in the midluteal phase, which suggests that high Gp130 levels may possibly contribute to embryo transport into the uterus.

Effects of Plasma-Wall Interactions on Hydrogen Isotopes and Helium Plasma Particles in the JET-ILW Tokamak

Rostami S. Hesami,Motevalli S. M.,Fadaei F.,Mohammadi S. 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.12

Zero-dimensional global particle balance modeling was applied to the JET-ILW tokamak to investigate the particle balance in the main plasma and wall inventory, including the wall recycling effect, co-deposition, and sputtered particles. In this model, we used the fueling rate, based on the experimental work and vacuum pumping of the JET-ILW. Our modeling results were then compared with experimental data from the JET-ILW tokamak. A qualitative agreement was observed between the model results and the experimental data. In addition, this model could be a promising for studing the particle behavior in ITER-like reactors.