Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Comparison of Single- site and Multi-site Based Calibrations of SWAT in Taleghan Watershed, Iran
1645
1652
EN
hamzeh
noor
Water and Soil Engineering, Tarbiat Modares University
hamzenor@yahoo.com
Calibration of model is critical for hydrologic modeling of large watersheds in a mountain watershed. In this study Soil and Water Assessment Tool (SWAT) used to comparison a single-site calibration procedure that employed streamflow measurement at outlet of watershed to a multi-site calibration method that used streamflow measurements at three stations (Galinak, Joestan and Dehdar). Results showed that the single-site calibration was able to sufficiently simulate the streamflow for total stations (NS: 0.66–0.81). Results of multi-site calibration method also, shows slightly improve in total stations, whereas it was improved in upper stations i.e. Joestan and Dehdar (NS: 0.70–0.82). But, in validation period, there were clearly apparent differences between the simulated results provided by multi-site and the single-site calibration methods. The results of this study showed that the multi-site calibration method has better calibration of SWAT in Taleghan watershed and generally has advantages to the single-site calibration
multi,site evaluation,Taleghan watershed,Distributed Hydrologic Model,SWAT
https://www.ije.ir/article_72405.html
https://www.ije.ir/article_72405_ba000871b05752f49bd5f7aabad03ca5.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
A Closed Loop Control of Quadratic Boost Converter Using PID Controller
1653
1662
EN
deepa
somasundaram
EEE, Panimalar ins of tech
dee_soms123@yahoo.co.in
SAMUEL
BABU
EIE, SATHYABAMA UNIVERSITY
dr.samuelrajeshbabu@gmail.com
This paper presents an implementation of open loop and closed loop control of Quadratic boost converter using PID controller. Quadratic boost converter consists of boost converter and fly back converter driven by a single switch. Quadratic boost converter QBC is designed especially for regulating the DC interface between various micro sources and dc-ac inverter to electricity grid. Quadratic boost converter,P,PI and PID controller are modeled, compared and evaluated by MATLAB simulations. It has been found that the transient and steady state performance is improved by using PID controller. This converter achieves high step-up voltage gain with appropriate duty ratio and low voltage stress on the power switch. The simulated open loop and closed loop performance is verified experimentally.
Quadratic boost converter QBC,PID Controller,coupled inductor,highstep,up voltage gain,Renewable energy systems
https://www.ije.ir/article_72406.html
https://www.ije.ir/article_72406_28b44f684b78fc6e62ad6b5c2f64ea60.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Redundancy Allocation Problem of a System with Three-state Components: A Genetic Algorithm (RESEARCH NOTE)
1663
1672
EN
Arash
Zaretalab
Industrial Engineering, Islamic Azad University, Qazvin Branch
arash_zaretalab@yahoo.com
S.T.A.
Niaki
Industrial Engineering, Sharif University of Technology
niaki@sharif.edu
Mani
Sharifi
Industrial Engineering, Islamic Azad University, Qazvin Branch
m.sharifi@qiau.ac.ir
Pedram
Pourkarim Guilani
Industrial Engineering, Islamic Azad University, Qazvin Branch
pedram_pourkarim@yahoo.com
The redundancy allocation is one of the most important and useful problems in system optimization, especially in electrical and mechanical systems. The object of this problem is to maximize system reliability or availability within a minimum operation cost. Many works have been proposed in this area so far to draw the problem near to real-world situations. While in classic models the system components are assumed to have two states of working and failed, in this paper, parallel components of serial sub-systems are considered to work in three states, each with a certain performance rate. The component states are classified into two working states of working with full performance and working with half performance, and a failed state. Besides, technical and organizational activities are considered to improve the performance of the components as well as the sub-systems. As the problem belongs to the class of NP-Hard, a genetic algorithm is utilized to solve it.
Reliability,multi,State systems,Redundancy allocation problem,Three,state components,Genetic Algorithm
https://www.ije.ir/article_72407.html
https://www.ije.ir/article_72407_44b479a383bc29b777fa2a38fc77501a.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
A New Compromise Decision-making Model based on TOPSIS and VIKOR for Solving Multi-objective Large-scale Programming Problems with a Block Angular Structure under Uncertainty
1673
1680
EN
S.M.
Mousavi
Industrial Engineering Department, Faculty of Engineering, Shahed University
mousavi.sme@gmail.com
Meghdad
Salimi
Department of Industrial and Mechanical Engineerin, Islamic Azad University
meghdadsalimi@gmail.com
This paper proposes a compromise model, based on a new method, to solve the multi-objective large-scale linear programming (MOLSLP) problems with block angular structure involving fuzzy parameters. The problem involves fuzzy parameters in the objective functions and constraints. In this compromise programming method, two concepts are considered simultaneously. First of them is that the optimal alternative is closer to fuzzy positive ideal solution (FPIS) and farther from fuzzy negative ideal solution (FNIS). Second of them is that the proposed method provides a maximum ‘‘group utility’’ for the ‘‘majority’’ and a minimum of an individual regret for the ‘‘opponent’’. In proposed method, the decomposition algorithm is utilized to reduce the large-dimensional objective space. A multi objective identical crisp linear programming derived from the fuzzy linear model for solving the problem. Then, a compromise solution method is applied to solve each sub problem based on TOPSIS and VIKOR simultaneously. Finally, to illustrate the proposed method, an illustrative example is provided.
VIKOR,Multiple Criteria Decision Making (MCDM),Multi Objective decision making (MODM),multi objective large,scale linear programming (MOLSLP),block angular structure,fuzzy positive ideal solution (FPIS),farther from fuzzy negative ideal solution (FN
https://www.ije.ir/article_72408.html
https://www.ije.ir/article_72408_481d74a4d058bd2beab91233cf2e96a6.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
A Novel Continuous KNN Prediction Algorithm to Improve Manufacturing Policies in a VMI Supply Chain
1681
1690
EN
Hasan
Khademi Zare
IE yazd, Yazd University
hkhademiz@yazd.ac.ir
Yahia
Yahia Mehrjerdi
Department of Industial Engineering, Faculty of En, Yazd University
mehrjerdyazd@gmail.com
Mohsen
Akhbari Varkani
Department of Industrial Engineering, Yazd University
akhbarimohsen@gmail.com
A.
Makui
Department of Industrial Engineering, Iran University of Science and Technology (IUST)
amakui@iust.ac.ir
This paper examines and compares various manufacturing policies which manufacturer may adopt so as to improve the performance of a vendor managed inventory (VMI) partnership. The goal is to maximize the combined cumulative profit of supply chain while minimizing relevant inventory management costs. The supply chain is a two-level system with a single manufacturer and single retailer at each level, in which the manufacturer takes the responsibility of overall inventories of supply chain. A base system dynamics (SD) simulation model is first employed to describe the dynamic interactions between the variables and parameters of manufacturer and retailer under VMI. Then, the mentioned policies are constructed using the base SD model that lead us to differentiate the behavior supply chain for each policies within a same duration of time. In this paper, we use continuous K-nearest neighbor (CKNN) as one of the instance-based learning methodologies to predict the best manufacturing rates. This algorithm effectively increases the combined profit of supply chain in comparison with other two policies. Accordingly, a numerical example along with a number of sensitivity analyses is conducted to evaluate the performance of mentioned policies.
Vendor managed Inventory,Continuous K,Nearest Neighbor,Learning,system dynamics
https://www.ije.ir/article_72409.html
https://www.ije.ir/article_72409_df33dfb7a5a15b18adcd6da7b4f24e68.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Development of Clay Foam Ceramic as a Support for Fungi Immobilization to Biodiesel Production (RESEARCH NOTE)
1691
1696
EN
mona
khalili
Renewable Energies, Material and Energy Research Center
khalilimona@gmail.com
Farzane
Zamani
Ceramic department, Materials and Energy Research Center
f_zamani_1385@yahoo.com
Biodiesel is an attractive alternative fuel because of its nontoxicity and biodegradability properties. Biodiesel is produced through transesterification of vegetable oils’ triglyceride. It is obtained from vegetable oils or fats either by chemical or enzyme-catalyzed transesterification with methanol or ethanol. By using whole-cell biocatalyst immobilized within biomass support particles (BSPs) can overcome the obstacle of enzymatic catalyst high cost. The object of this research is to produce clay foam ceramic as BSP by replica method from raw materials such as clay, sodium silicate and sodium tripolyphosphate. To prepare the whole cell biocatalyst the Rhizopus Oryzae fungi (PTCC 5174) was immobilized on the ceramic foam with bulk density and porosity of 0.3 g/cm3 and 88.8%, respectively. The deposited biomass on clay foam particles can be observed through scanning electronic microscopy (SEM). A packed-bed reactor (PBR) system using whole-cell biocatalyst was developed for biodiesel production by pretreated used cooking oil (UCO). Clay foam ceramic seems to be more suitable with respect to polyurethane foam for supporting fungi immobilization because it shows high mechanical strength and reduces damaged microorganisms.
Biodiesel,Clay foam ceramic,Whole cell biocatalyst,Packed,Bed Reactor,Transesterification
https://www.ije.ir/article_72410.html
https://www.ije.ir/article_72410_6fce1a68db2621a7831ff27cb13f45e1.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Novel Amine Modified Nanoporous SBA-15 Sorbent for the Removal of H2S from Gas Streams in the Presence of CH4 (RESEARCH NOTE)
1697
1704
EN
Mehdi
Babaei
Chemistry, Iran University of Science and Technology
mehdibabaee@chem.iust.ac.ir
Mansoor
Anbia
Research Laboratory of Nanoporous Materials, Iran University of Science and Technology
anbia@iust.ac.ir
A new sorbent has been developed by grafting Hexamethylenetetramine on a mesoporous molecular sieve (SBA-15) by wet impregnation method. This sorbent (Hexamine/SBA-15) has been characterized using N2 physisorption, X-ray diffraction (XRD) at low angles (2θ°) and FT-IR. To investigate the H2S removal capacity of this adsorbent from CH4-containing gas mixtures, the breakthrough tests have been performed on a fixed-bed flow system. The results show that after the amine loading, hexamine is dispersed inside the mesochannels of mesoporous SBA-15. Effects of the amine loading and sorption temperature on the sorption behavior of this developed sorbent have also been studied. Increase of amine loading enhances the H2S sorption on this sorbent, while increase in temperature, both the breakthrough capacity (qb) and the saturation capacity (qs) decrease. High sorption capacity is observed at low temperature which provides a promoting effect in removal of H2S from gas mixtures streams on the developed Hexamine/SBA-15 sorbent. This developed sorbent is regenerated easily at 100°C, and shows very good stability. Therefore it can be effectively used for removing H2S from industrial gas stream.
Hexamine based sorbent,Adsorbent regeneration
https://www.ije.ir/article_72411.html
https://www.ije.ir/article_72411_739f192c135a97b77042f298884a8e53.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Elimination Back Gouging Operation in Submerged Arc Welding Butt without Chamfers ASTM A516 (TECHNICAL NOTE)
1705
1712
EN
mohsen
saleh fard
, Machine Sazi Arak Co
g_saleh2002@yahoo.com
ebrahim
heshmat dehkordi
, Iranian Corrosion Association
e.dehkordi@yahoo.com
ahmad
jaberi
Student, Najafabad Branch, Islamic Azad University
a_jaberi2007@yahoo.com
Submerged arc welding is used widely in oil and gas industry construction for storage tanks, pressure vessels, shipbuilding and etc. One of the processes of submerged arc welding is back gouging operations. This paper presents a way to remove the back gouging operation from the submerged arc welding process. For this purpose, effects of submerged arc welding parameters onA516-70steel sample were investigated. 16 and18mm thickness sheets without chamfering were prepared and by choosing the best parameters welded from face and back. Also the effects of stress-relief heat treatment and preheat were investigated. Microstructure and mechanical properties were in standard situation and shows the performance of this project. Removing the back gouging operation significantly reduced the cost, time and also reduced noise and environment pollution in submerged arc welding process. With eliminating back gouging practice few observed an 80% decrease in costs and also decrease in environmental and acoustic pollutions.
ASTM A516,70 steel,submerged arc welding,back gouging,preheat,Heat treatment
https://www.ije.ir/article_72412.html
https://www.ije.ir/article_72412_8e0b0f6eebbaa64947ae870ef209741d.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
An Investigation of Temperature Effects on Solar Photovoltaic Cells and Modules
1713
1722
EN
Lakshmi
Ponnusamy
Electrical and Electronics Engineering, College of Engineering, Guindy
p_lakshmi@annauniv.edu
Natarajan
E
Mechanical Engineering, College of Engineering
enat123@gmail.com
dhass
desappan
Mecanical Engineering, College of Engineering
dasaradhan.ad@gmail.com
The solar photovoltaic (PV) systems are facing serious problems due to unavoidable losses in their system, leads to more devation of output power from the input power level. This effect is known as a mismatch effect and is available in PV systems. Many losses are encountered in PV system and it is difficult to minimize such losses. In this paper, the influence of thermal effect on the solar PV system is considered and its influence on the performance of the operation, fill factor, open circuit voltage, and short circuit current, band gap level of various semiconductor materials, output power and efficiency are analyzed. The temperature effect of a solar PV cell, while connecting in a 36 cells in a module is analyzed for the various connection configurations like Simple Series configuration (SS), Series-Parallel configuration (SP), Total-Cross Tied configuration (TCT), Bridge-Linked configuration (BL), and HoneyComb configuration (HC) using MATLAB software. Increases the level of temperature for various connection configurations, correspondingly decreases their open circuit voltage, series resistance. Shunt resistance and current are may not fully affects due to temperature. Finally this problem creates a heating effect in the solar PV cell, so the life span of the photovoltaic panel is decreased gradually. While increases the temperature level soldering points are affected and cell encapsulation is affects. Solar cell materials are changed their performance of operation,while changes in the band gap with the effect of temperature.
Solar Cell,Temperature,connection configuration of solar cell,Losses,MATLAB software
https://www.ije.ir/article_72413.html
https://www.ije.ir/article_72413_4580cfbf653711b1be33c46f3737b58f.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Experimental Detection of Composite Delamination Damage based on Ultrasonic Infrared Thermography
1723
1730
EN
Qing
Wu
School of Automation, Xi’an University of Posts and Telecommunications
boyan315@163.com
Youming
Wang
School of Automation, Xi’an University of Posts and Telecommunications
xautroland@163.com
An experimental setup is designed to detect composite delamination damage based on ultrasonic infrared thermography. The ultrasonic infrared thermography system is composed by ultrasonic excitation system, infrared thermal imager and data acquisition system and two damaged composite plate specimens are produced in the experiment. The image processing methods including thresholding, filters, edge detection and morphological processing method are combined to analyze infrared thermal images and accurately identify the location and size of the delamination damage. The temperature changes of defective composites under different preload of ultrasonic excitation are analyzed and the experiments demonstrate that the ultrasonic detection has the effect of the selection of heating in the defective area of the composite. The experimental results come to the conclusion that the ultrasonic infrared thermography is an effective quantitative method to detect the composite delamination damage.
ultrasonic infrared thermography,delamination damage,composite plates,experimental detection
https://www.ije.ir/article_72414.html
https://www.ije.ir/article_72414_d36c80462ba68d39330b3627bcb5e40e.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Meshless Local Petrov-Galerkin Method for Elasto-Static Analysis of Thick-Walled Isotropic Laminated Cylinders
1731
1740
EN
Ahmad
Bagheri
Mechanical Engineering, University of Guilan
bagheri@guilan.ac.ir
Gholam Hossein
Baradaran
Mechanical Engineering, Shahid Bahonar University of Kerman
barao2002@yahoo.com
Mohammad Javad
Mahmoodabadi
Mechanical Engineering, Sirjan University of Technology
mahmoodabadi@guilan.ac.ir
In this paper, one of the simplest and most regular members of the family of the Meshless Local Petrov-Galerkin (MLPG) methods; namely MLPG5, is applied to analyze the thick-walled isotropic laminated cylinders under elasto-static pressure. A novel simple technique is proposed to eliminate a very important difficulty of the meshless methods to deal with material discontinuities regarding to the high continuity of their shape functions. The Moving Least Squares (MLS) approximation is used for constructing the trial functions, and a simple Heaviside step function is chosen for the test function. The direct interpolation method is employed to impose the essential boundary conditions. Acceptable agreements with the analytical solutions and finite element method results are obtained specially at the material discontinuity boundaries, which suggest its application in other classes of problems.
Meshless Local Petrov,Galerkin (MLPG),Moving Least Squares (MLS),Material Discontinuity,Thick,Walled Laminated Cylinders
https://www.ije.ir/article_72415.html
https://www.ije.ir/article_72415_390abc314f8638408e9c28b6cda1a1f3.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Effect of Redmud Particulates on Mechanical Properties of BFRP Composites (TECHNICAL NOTE)
1741
1750
EN
arumugaprabu
veerasimman
Mecanical Engineering, Kalasalingam University
aprabucad_mech@yahoo.com
uthayakumar
m
mechanical engg, kalasalingam university
uthaykumar@gmail.com
manikandan
v
mechanical engg, S.V.C.E.T
vaimanikandan@yahoo.com
This article reports the effective usage of redmud(RM) an industrial waste ,as a novel filler in polymer matrix. The composite has been fabricated with redmud as secondary reinforcement in banana fiber reinforced polyester (BFRP) using compression molding technique. The mechanical properties such as tensile, flexural and impact strength have been studied for different fiber weight percentage, weight percentage of red mud and chemical treatment of fiber. It is observed that the addition of 10 wt percent of redmud improves the impact and flexural properties for both silane treated and untreated banana fiber but there is a decreased trend for tensile strength. It is also found that banana fiber particulate composites have superior mechanical properties than the banana/polyester. Addition of redmud to the banana fiber decreases the moisture absorption of the composites. The scanning electron microscopy (SEM) studies have been done to know the fracture mechanism.
Redmud (RM),Banana Fiber,Polyester Resin,Mechanical properties,SEM
https://www.ije.ir/article_72416.html
https://www.ije.ir/article_72416_48b3a49307545816f643a9220d291f04.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
An Investigate on Power, Torque and Exhaust Gas Emission Variation: Effect of Hydroxy Gas Addition to Inlet Air of a SI Engine
1751
1756
EN
Mohammad Javad
Ghomashi
Energy, Merc
mjgh2004@gmail.com
Hydrogen has been known as a clean and suitable fuel to replace conventional fossil fuels. One of the common hydrogen production methods is using water electrolysis process. This method produces oxygen as well as hydrogen by ratio of 1:2. The aim of this work is to investigate the effects of inlet air enrichment by adding produced hydrogen and oxygen to an internal combustion engine. For this purpose, an electrolysis system consisting of four cells have been built and the produced gas mixture was transferred to the inlet manifold of the engine via a rubber hose. The experimental results show that adding hydrogen and oxygen to the inlet air under the full load can cause reduction in CO and HC by 21% and 19% respectively, and increases power and torque by 5.5% under similar condition.
Electrolysis,hydrogen,Hydroxy,Internal Combustion Engine (ICE)
https://www.ije.ir/article_72417.html
https://www.ije.ir/article_72417_773a1de75b05cb0b9f8efb202ec5d2cc.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Controlling the Power Output and Combustion Phasing in an HCCI Engine
1757
1766
EN
Mohsen
Nazoktabar
Engineering, Roudehen Islamic Azad University
nazoktabar@riau.ac.ir
In development of Homogeneous Charge Compression Ignition (HCCI) engines, simultaneous control of combustion phasing and power output has been a major challenge. In this study, a new strategy is developed to control the engine power output and combustion phasing at any desired operating condition. A single zone thermodynamic model coupled to a full kinetic mechanism of Primary Reference Fuels (PRFs) is developed to predict characteristic parameters such as; Start of Combustion (SOC) and Indicated Mean Effective Pressure (IMEP) and also thermodynamic constant parameters for processes through an HCCI engine cycle. A dynamic interactive control model has been developed for the entire cycle of a HCCI engine to predict combustion phasing and IMEP.The results derived from the developed model are validated against experimental data for a single cylinder Ricardo engine. A two input - two output controller is then designed to track crank angle at which 50% of in cylinder fuel mass is burned (CA50) and IMEP by adjusting the input data. In this study two control models are presented; open loop and closed loop. Performance of the controller is tested on a physical HCCI engine model to evaluate the tracking performance and disturbance rejection properties. Results indicate that the designed controller is capable to accurately track both CA50 and IMEP while can reject the disturbances from variations in the engine speed and the intake manifold temperature.
HCCI engine control,Two Input Two Output Controller,Fuel Rate & Phi Inputs,IMEP & CA50 Outputs
https://www.ije.ir/article_72418.html
https://www.ije.ir/article_72418_1407e2c25eec6e123d0bf44606fe0d71.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Physical Modeling of a Hybrid Wind Turbine-solar Panel System Using Simscape Language (RESEARCH NOTE)
1767
1776
EN
saka
abdelmjid
mechanical enginering, national school of applied sciences
saka.aldelmjid@gmail.com
elhaini
jamila
Mechnical Engineering, faculty of sciences and technologie of Fez
j.elhaini@gmail.com
Being sustainable and producing little waste products, the renewable energy knows a rapid deployment. Unfortunately, the intermittent characteristic of these energies makes them difficult to control. The influence of this aleatory character can be reduced with the coupling of two or more sources of renewable energy and secondly with a sound management of storage systems. This new configuration of production and energy management is the target of our research. The objective of this paper is to construct a model of a multi-sources system feeding a domestic house with the multi-physics approach which enables us to model, simulate and control all components and subsystems in our system consisting of wind turbine, solar panel and storage system with battery. This system feeds a domestic house. To achieve this objective, firstly, a system description is presented. Secondly, a SIMSCAPE model for the multisource system is developed in the MATLAB/SIMSCAPE software. Finally, results are derived from simulations.
multi,physic system,multisource system,Wind Turbine,Photovoltaic Panel,Battery,SIMSCAPE
https://www.ije.ir/article_72419.html
https://www.ije.ir/article_72419_aa27dcd337dd35d9429b2830cbe7ef0f.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Stabilization and Walking Control for a Simple Passive Walker Using Computed Torque Method (RESEARCH NOTE)
1777
1786
EN
Masoumeh
Safartoobi
Department of solid Mechanics, Babol Noshirvani University of Technology
m.safartoobi@gmail.com
Mohammad
Hassan Ghasemi
Mechanical Engineering, Babol Noshirvani University of Technology
mhghasemi@nit.ac.ir
Morteza
Dardel
, Babol Noshirvani university of technology
dardel@nit.ac.ir
Abstract The simple passive dynamic walker can walk down a shallow downhill slope with no external control or energy input. Nevertheless, the period-one gait stability is only possible over a very narrow range of slopes. Since the passive gaits are extremely sensitive to slope angles, it is important to use a control strategy in order to achieve a wide range of stable walking. The computed torque method is proposed here to produce stable period-one gait cycles for different slopes. In this present method, the unstable walking gait is stabilized by a stable period-one gait pattern on a small specific slope. The proposed approach is illustrated by the simplest passive walkers with point and curved feet. Simulation results reveal the usefulness of this control method for improvement in stability properties of the models.
Keywords Passive dynamic walker,Walking Robot,Computed Torque,stable period,one gait
https://www.ije.ir/article_72420.html
https://www.ije.ir/article_72420_b2a61d58521af6d2df8d987d6a83b7cf.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Fixture Design Automation and Optimization Techniques: Review and Future Trends
1787
1794
EN
Awaludin
Mohamed Shaharoun
Manufacturing and industrial engineering, UTM
awaludin.m.s.kl@utm.my
heidar
hashemi
Mechanical Engineering, Yasuj Branch, Islamic Azad University
heidar.hashemi63@gmail.com
Izman
Sudin
Manufacturing and industrial engineering, UTM
izman.b.s@utm.my
Fixture design is crucial part of manufacturing process. Fixture design is a critical design activity process, in which automation plays an integral role in linking computer-aided design (CAD) and computer-aided manufacturing (CAD). This paper presents a literature review in computer aided fixture design (CAFD) in terms of automation and optimization techniques over the past decades. First, the reason behind necessity of automated fixture design is stated. According to the degree of automation, fixture design methods are then categorized based on significant work done in the CAFD field. Regarding the need of automated fixture design systems, optimization techniques, which are mostly used for automated CAFD methods, are closely considered. The significant optimization techniques works are then studied in case of applications and working principle. At the end, the current weaknesses of the existing methods and the research fields, which require deeper studies as future trends, are presented as well.
Computer aided fixture design (CAFD),Genetic algorithm (GA),Finite element method (FEM),Fixture design automation
https://www.ije.ir/article_72421.html
https://www.ije.ir/article_72421_b775203d025174162ecda4491447e543.pdf
Materials and Energy Research Center
International Journal of Engineering
1025-2495
1735-9244
27
11
2014
11
01
Physical Model Test and Numerical Simulation Study of Deformation Mechanism of Wall Rock on Open Pit to Underground Mining (RESEARCH NOTE)
1795
1802
EN
Jianyi
Yuan
School of civil Engineering, Hubei Polytechnic University
jian_yuan8888@sohu.com
Chuanbo
Zhou
School of Civil Engineering, Hubei Polytechnic University
1819885838@qq.com
Dingbang
Zhang
School of civil Engineering, Hubei Polytechnic University
ericzdb@126.com
This paper is based on the open pit to underground mining practice of Daye Iron Mine. The influence mechanism between high-steep slope and non-pillar sublevel caving method is studied by using physical model test. Firstly, engineering geological properties of the choosing typical research section is analysed and generalized. Secondly, the system of open pit to underground mining is developing according to the characteristics of model test. In the end, the open pit to underground mining model test is studied. The results of model test show that the total displacements and stresses of the model are increasing with the mining depth increasing, the wall rock stresses undergoes a process from dramatic change to slow change and finally show a tendency toward stabilization because of the disturbance of underground mining, the final failure of slopes and wall rock are limited in a small area nearing the ore body after underground mining.
Open,pit to underground,Model Test,influence mechanism,high,steep slope,underground mining
https://www.ije.ir/article_72422.html
https://www.ije.ir/article_72422_8455d0d8851f2adb0a6f44e9748d61ae.pdf