eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
1
9
534921
Design of Optimal PID, Fuzzy and New Fuzzy-PID Controller for CANSAT Carrier System Thrust Vector
A. Kosari
kosari_a@ut.ac.ir
1
H. Jahanshahi
hadi_jahanshahi@ut.ac.ir
2
A. A. Razavi
a.razavi68@ut.ac.ir
3
Department of New Sciences and Technologies, University of Tehran, Iran
Department of New Sciences and Technologies, University of Tehran, Iran
Department of New Sciences and Technologies, University of Tehran, Iran
<span lang="EN-GB">In this paper, multi-objective optimization based on Genetic Algorithm is used to find the design variables of PID, fuzzy and new Fuzzy-PID controllers applying for a thrust vector control of CANSAT carrier system. Motion vector control is considered according to the dynamic governing equation of the system which is derived using Newton’s method and defined mission in delivering payload into the specific height and flight path angle. The cost functions of the system are position error from the set point and deviation of the vector angle of carrier system with carrier body</span>, where t<span lang="EN-GB">hese cost functions must be minimized simultaneously. Results demonstrate that this new Fuzzy-PID controller is superior to other controllers which are exerted in the thrust vector control of a CANSAT carrier system. This Fuzzy-PID is capable of doing the mission with decrease in settling time and rise time with respect to the convenient minimized objective function values. </span>
http://admt.iaumajlesi.ac.ir/article_534921_f42e7a40670b7b6a754e018c59c62154.pdf
Multi-objective optimization
Genetic Algorithm
PID-controller
Fuzzy controller
Fuzzy-PID controller
CANSAT carrier system
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
11
16
534922
Developing a control strategy for AFM nano- micro manipulation
H. RaeisiFard
raeisifard@qiau.ac.ir
1
A. K. Hoshiar
hoshiar@qiau.ac.ir
2
Faculty of Industrial and Mechanical Engineering, Islamic Azad University, Qazvin Branch, Qazvin, Iran
Faculty of Industrial and Mechanical Engineering, Islamic Azad University, Qazvin Branch, Qazvin, Iran
<span lang="EN-GB">Nowadays, with the growing use of AFM (Atomic Force Microscope) nanorobots in the fabrication of nanostructures, research in this area has been proliferated. The major limiting of manipulation process is the lack of real-time observation. Computer simulations have been widely applied to improve the feasibility of the process. The existing 2D strategies are incapable of presenting the feasibility of the process. Therefore, 3D simulations of effective forces during the manipulation process and the control mechanism of the process have been presented in this research, where the effective parameters are investigated. To evaluate the validity of the presented results, a FEM simulation is proposed. It is observed that the two sets of results (the analytical method and the finite element approach) have adequate correlation, while the discrepancy which is in an acceptable range, is due to the different solving technique of the finite element method. By applying the presented models, it is now possible to accurately predict the effective forces for fabricating the nanostructures. </span>
http://admt.iaumajlesi.ac.ir/article_534922_2b4f35704c3b8515575662422218d48b.pdf
AFM Nano robot
Controlled Manipulation
Finite element method
Manipulation
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
17
28
534923
Design and Control of a 3 DOF Hand Skeleton for Rehabilitation after Stroke
M. Dehghani Rorani
valiasr_mahdi@yahoo.com
1
S. Rahmati
rahmati@rapidtoolpart.com
2
Department of Mechanical Engineering, Islamic Azad University, Majlesi Branch, Isfahan, Iran
Department of Mechanical and Aerospace Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
<span lang="EN-GB">Stroke is one of the most common diseases among the elderly with high personal and societal costs. In recent years, robotic rehabilitation for stroke has become an active area of research for assistance, monitoring and qualifying the rehabilitation treatments. The key issue needed for improving rehabilitation system is that patient feedback should be taken into account by the robotic rehabilitation systems for providing rehabilitation treatment. Changes in the delivery of rehabilitation treatment are an important issue since the patient or specialist should be able to express their sense about doing things and apply the needed improvements in treatment. Therefore, in this study, a three degree-of-freedom (3-DOF) exoskeleton design of a thumb has been investigated. Then, a control structure is provided for greater security in which the patient feedback is evaluated in order to make necessary automatic changes in method of treatment (changing speed and force). In this design, a versatile framework with high performance is offered to simultaneously control thumb force and position regarding the patients’ feedback. This may help to keep the patient in the treatment process, reduce interventions and therapist caseload, effective automatic transmission of treatment and pain relief during the course of treatment. The results of the study suggest that the force and speed on the thumb can be changed during the rehabilitation period according to the patient's needs. This advantage may be considered as an essential step for improvement of the rehabilitation efficiency.</span>
http://admt.iaumajlesi.ac.ir/article_534923_3fbf17b43edd907d19c644f2e45ef4a0.pdf
Patient Feedback
Thumb Exoskeleton
Thumb Force Control
Thumb Position Control
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
29
36
534924
A study on the numerical simulation of thermo-mechanical behavior of the novel functionally graded thermal barrier coating under thermal shock
N. Nayebpashaee
nayebpashaee@iust.ac.ir
1
H. Vafaeenezhad
nayebpashae@iust.ac.ir
2
S. M. M. Hadavi
mehdihadavi@gmail.com
3
S. H. Seyedein
seyedein@iust.ac.ir
4
M. R. Aboutalebi
mrezab@pnu.ac.ir
5
H. Sarpoolaky
hsarpoolaky@iust.ac.ir
6
Department of Material & Metallurgy Engineering, Iran University of Science and Technology
Department of Material & Metallurgy Engineering, Iran University of Science and Technology
Department of Material & Metalurgy Engineering, Malek Ashtar University of Technology
Department of Material & Metallurgy Engineering, Iran University of Science and Technology
Department of Material & Metallurgy Engineering, Iran University of Science and Technology
Department of Material & Metallurgy Engineering, Iran University of Science and Technology
An attempt was made to investigate the thermal and residual stress distribution in a novel three layer (La<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>/8YSZ/NiCrAlY) during a real-like heating regime which includes heating, service time and final cooling. For achieving maximum accuracy and consistency in calculation of thermal and mechanical properties of hybrid coating system, all related and required properties were introduced to the software in temperature-dependent mode. Element modification approaches like mass scaling leads to a considerable reduction in running time while satisfying and not violating accuracy and converging criteria and constrains. Applying adaptive hybrid meshing techniques which applies both mesh–part dependency and independency during numerical iterative solution avoids element distortion and diverging in coupled problem. Heat flux and nodal temperature contours indicated that, most of damaging and harmful thermal load and residual stresses concentrate on ceramic top coats and this may lead less harm and life time reduction in the substrate.
http://admt.iaumajlesi.ac.ir/article_534924_6096e9df4f341acab0b97c321312d785.pdf
Finite Element Simulation
Residual stress
thermal barrier coating
Thermal Shock
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
37
46
534925
Dynamic Analysis of AFM in Air and Liquid Environments Considering Linear and Non-linear Interaction Forces by Timoshenko Beam Model
P. Maleki Moghadam Abyaneh
maleki.peroshat@gmail.com
1
M.H. Korayem
hkorayem@iust.ac.ir
2
B. Manafi
b.manafi@srbiau.ac.ir
3
M. Damircheli
md_19762003@yahoo.com
4
Department of Computer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
The atomic force microscopy of the cantilever beam frequency response behaviour in the liquid environment is different in comparison with air environment. In this paper, the dynamic analysis of AFM in the air and liquid environments is carried out in consideration of linear and non-linear interaction forces and also the effect of geometrical parameters such as length, width, height; and inclined angle on the vibrating motion of the rectangular cantilever is investigated. A rectangular cantilever based on the Timoshenko theory is simulated in ADAMS software and more accurate results are obtained by considering the probe tip and the angular location of cantilever at simulation. At the end of the cantilever, a silicone probe is considered where the applied forces on it are approximated using two tangential and vertical springs. The vibrational simulation of cantilever at two states is carried out with regard to linear and non-linear interaction forces. The amplitude and resonance frequency of the simulated cantilever based on Timoshenko theory are different from obtained results of Euler-Bernoulli theory due to the effect of shear deformation and rotary moment in Timoshenko theory. Therefore, the Timoshenko theory has better accuracy in comparison with Euler theory. Many chemical and biological processes occur instantly; therefore the use of cantilevers with small length for improving the imaging speed at the tapping mode and in the liquid environment is essential. Eventually short cantilever that is modeled based on the Timoshenko theory may produce more accurate results. This paper is aimed to demonstrate that the amplitude and resonance frequency of vibration in the liquid environment is different from amplitude and frequency of vibration in the air environment due to the damping coeficient and added mass of liquid.
http://admt.iaumajlesi.ac.ir/article_534925_8d27c199ca369a6e337dc8fb02a2e4d3.pdf
AFM
Frequency Response
Interaction force
Liquid Environment
Timoshenko theory
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
47
54
534926
Effects of Slip Boundaries on Mixed Convection of Al2O3-water Nanofluid in Microcavity
A. R. Rahmati
ar_rahmati@kashanu.ac.ir
1
T. Azizi
azizi.taghi@yahoo.com
2
S. H. Mousavi
s.hmousavi@live.com
3
A. Zarareh
amin.zarareh@gmail.com
4
Department of Mechanical Engineering, University of Kashan, Iran
Department of Mechanical Engineering, University of Kashan, Iran
Department of Mechanical Engineering, University of Kashan, Iran
Department of Mechanical Engineering, University of Kashan, Iran
Due to the importance of the slip effect on modeling of microchannel and microcavity, numerical investigations have been introduced in this work for studying the mixed convection of Al<sub>2</sub>O<sub>3</sub>-water nanofluid in a square microcavity. Governing equations are discretized and solved using the Finite Volume Method and SIMPLER algorithm. The Knudsen number is selected between 0.001 and 0.1 to consider slip velocity and the temperature jump boundary conditions in slip flow regime. In this study we investigate the influence of the Knudsen number on the average Nusselt number and heat transfer rate of Al<sub>2</sub>O<sub>3</sub>-water nanofluid. Results shows that the average Nusselt number is the function of Richardson number, Knudsen number and volume fraction of nanoparticles. Increasing the Richardson number, makes the forced convection less effective and leads in reduction of the Nusselt number. Hence, increasing the Knudsen number, leads to the temperature gradient reduction and reducing the average Nusselt number. As a result, the average Nusselt number could be enhanced up to 10.93% by using nanoparticles in the base fluid.
http://admt.iaumajlesi.ac.ir/article_534926_31a7cd14acd35acc8ab068ceec6585cf.pdf
Knudsen Number
Mixed Convection
Microcavity
Nano fluid
Slip Flow
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
55
64
534927
Prediction of Residual Stresses by Radial Basis Neural Network in HSLA-65 Steel Weldments
M. Heidari
moh104337@yahoo.com
1
Department of Mechanical Engineering, Aligudarz Branch, Islamic Azad University, Aligudarz, Iran
This paper investigates the residual stress fields in the vicinity of weld bead in HSLA-65 steel weldments using a neural network. This study consists of two cases: (i) <em>the experimental analysis </em>was carried out on the measurement of residual stresses by XRD technique. Many different specimens that were subjected to different conditions were studied. The values and distributions of residual stresses occurring in welding of HSLA-65 plate under various conditions were determined. (ii) <em>The mathematical modeling analysis </em>has proposed the use of radial basis (RB) NN to determine the residual stresses based on the welding conditions. The input of RBNN are welding current, welding voltage, welding heat input, travel speed of welding, wire feed speed and distance from weld. The best fitting training data set was obtained with 18 neurons in the hidden layer, which made it possible to predict residual stresses with accuracy of at least as good as the experimental error, over the whole experimental range. After training, it was found that the regression values<em> (R</em><em><sup>2</sup></em>) are 0.999664 and 0.999322 for newrbe and newrb functions respectively. Similarly, these values for testing data are 0.999425 and 0.998505, respectively. Based on the verification errors, it was shown that the radial basis function of neural network with newrbe function is superior in this particular case, and has the average error of 7.70% in predicting the residual stresses in HSLA-65. This method is conceptually straightforward, and it is also applicable to other type of welding for practical purposes.
http://admt.iaumajlesi.ac.ir/article_534927_6996b1229bfde61c2258b0aca6e1b8d9.pdf
Artificial Neural Network
HSLA-6
Residual stress
Radial Basis Function
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
65
71
534928
Designing an Artificial Neural Network Based Model for Online Prediction of Tool Life in Turning
A. Salimiasl
aydin952@gmail.com
1
A. Özdemir
ahmetoz@gazi.edu.tr
2
I. Safarian
ibr_safa@yahoo.com
3
Department of Mechanical Engineering, Payame Noor University, Iran
Department of Manufacturing Engineering, Faculty of Technology, University of Gazi, Ankara, Turkey
Department of Mechanical Engineering, Payame Noor University, I.R. of Iran
Artificial neural network is one of the most robust and reliable methods in online prediction of nonlinear incidents in machining. Tool flank wear as a tool life criterion is an important task which is needed to be predicted during machining processes to establish an online tool life estimation system.In this study, an artificial neural network model was developed to predict the tool wear and tool life in turning process. Cutting parameters and cutting forces were used as input and tool flank wear rates were regarded as target data for creating the online prediction system. SIMULINK and neural network tool boxes in MATLAB software were used for establishing a reliable online monitoring model. For generalizing the model, full factorial method was used to design the experiments. Predicted results were compared with the test results and a full confirmation of the model was reached.
http://admt.iaumajlesi.ac.ir/article_534928_854ced4e771da939c8093d1d5c15cca8.pdf
Artificial Neural Networks
Cutting Forces
Prediction
Tool Life
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
73
80
534929
A New Rolling Pressure Model for An Actual Reversing Cold Rolling Strip Mill
M. Heydari Vini
m.heydarivini@gmail.com
1
Department of Mechanical Engineering, Mobarakeh branch, Islamic Azad University, Mobarakeh, Isfahan, Iran
The forging model for cold rolling is one of the rolling models which is used in rolling calculations. In this model, the final rolling pressure is an average value and it is not as accurate for actual and industrial cases. Also, by using forging model, friction hill curves are plotted due to the central point of rolling bite length while frictional stresses intersect at the neutral point of rolling bite. In this study, a new model based on the forging model is presented to determine the rolling pressure during cold rolling process for using in a reversing tandem mill, where this is called “Improved forging model”. In the proposed model, the intersection of the frictional forces is the neutral point. Finally, the computing results from this new model coincide well with the precedent investigations.
http://admt.iaumajlesi.ac.ir/article_534929_9fb359cb9585fd6aec972f86b323a215.pdf
Friction Hill Curve
Pressure Model
Two Stand Reversing Cold Mill
eng
Islamic Azad University Majlesi Branch
ADMT Journal
2252-0406
2383-4447
2015-06-01
8
2
81
90
534930
Numerical Simulation of Fluid-Structure Interaction and its Application in Impact of Low-Velocity Projectiles with Water Surface
N. Khazraiyan
n_khazra@dr.com
1
N. Dashtian Gerami
n.dashtian@modares.ac.ir
2
M. Damircheli
md_19762003@yahoo.com
3
Department of Mechanical Engineering, Islamic Azad University, Islamshahr Branch, Tehran, Iran
Department of Mechanical Engineering, University of Tarbiat Modares, Tehran, Iran
Department of Mechanical Engineering, Islamic Azad University, Shahr-e-Qods Branch, Tehran, Iran
In this article, finite element method and ALE formulation were used to numerically simulate impact of low-velocity specific projectiles with water surface. For the simulation, Ls-Dyna finite element code was used. Material models which were used to express behavior of air and water included Null material model. For the projectile, plastic-kinematics material model was applied. Mie-Gruneisen equation of state was also attributed to air and water. First, the results were validated by analyzing the impact of metallic cylinder with water surface and then impact of a mine as a low-velocity projectile was simulated. Among major outputs were force and pressure applied to the projectile, velocity and acceleration variations upon entering water, stress-strain variations and variations of water surface in various steps of analysis. The results showed that impact of structure with fluid can be modeled using finite element model with high accuracy in terms of quality and quantity.
http://admt.iaumajlesi.ac.ir/article_534930_19f8b3d6635cd625502ad9e7e990497a.pdf
ALE Formulation
Fluid-Structure Interaction
Finite element method