Mathematical modelling and stability study of KiteGen movement in space
Sadra
Pourtaheri
Msc. Student, Department of Mechanical Engineering, Shahid Rajaee Teacher Training University
author
Ali
Rahmani Henzaki
استادیار، دانشکده مهندسی مکانیک، دانشگاه تربیت دبیر شهید رجایی، تهران
author
Hosein
Derijani
Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
author
text
article
2015
per
The drawback of energy production from fossil fuels, which is due to resource limitations, high pollution and degradation of the environment, causes to attract researchers’ attention to renewable sources of energy such as wind, solar, hydroelectric, geothermal, etc. In this article, one of the new ideas for generating electrical energy from wind called KiteGen is investigated. The project began in Torino, Italy for the first time. To produce the maximum energy, it is necessary to properly control the trajectory of kite, which needs a precise mathematical model and dynamic analysis of the kite behavior. This paper presents mathematical modeling and study of controllability and observability of Kite moving along the path that has been suggested somewhere else. The results of this research show that the kite around the path is controllable and observable, and thus the kite is stable in space.
Iranian Journal of Mechanical Engineering Transactions of ISME
ISME
2538-4775
17
v.
1
no.
2015
6
15
https://jmep.isme.ir/article_27198_5ff47ea80ad1d71995a715075e9a8e9b.pdf
Nonlinear vibration analysis of laminated composite plates using approximate and analytical methods
Amir
Lotfavar
نویسنده مسئول، استادیار، دانشکده مهندسی مکانیک و هوافضا، دانشگاه صنعتی شیراز
author
Hosein
Rafiei Pour
دانشجوی دکترای مکانیک، دانشکده مهندسی مکانیک و هوافضا، دانشگاه صنعتی شیرا
author
Soghra
Hamze Shalamdari
کارشناسی ارشد، دانشکده مهندسی مکانیک و هوافضا، دانشگاه صنعتی شیراز
author
Tahere
Mohammadi
کارشناسی ارشد، دانشکده مهندسی مکانیک و هوافضا، دانشگاه صنعتی شیراز
author
text
article
2015
per
In this paper, the analysis of nonlinear free vibration in laminated composite plates is presented using two approximate analytical methods. Since it is necessary to investigate the effects of different parameters on nonlinear vibrations of composite plates and to find an analytical-approximate solution, a composite plate was modeled considering nonlinear terms in Von Karman strain-displacement relations, at first. Then, the partial differential equation governing the nonlinear motion was extracted and the equation was reduced in to an ordinary non-linear differential equation. Homotopy analysis method is an effective and accurate method for solving nonlinear differential equations and also the frequency amplitude method has good accuracy beside its simplicity. In this regard, in order to achieve an acceptable analytical-approximate solution, the mentioned methods were used. The results reveal that the proposed methods have high accuracy while it offers an analytical closed form solution for the nonlinear problem. Finally, the effect of different parameters such as aspect ratio, layers configuration and modulus ratio on the frequency ratio of isotropic and composite plates was studied.
Iranian Journal of Mechanical Engineering Transactions of ISME
ISME
2538-4775
17
v.
1
no.
2015
16
39
https://jmep.isme.ir/article_27209_fce41db0c886f3b7018c5a137f53ca53.pdf
Size and shape optimization of two dimensional trusses applying multi objective functions with NSCSS method
Seyed Saeed
Hoseini
کارشناسی ارشد، گروه مهندسی مکانیک، واحد سمنان، دانشگاه آزاد اسلامی، سمنان،
author
Ali
Ghodosian
Department of Mechanical Engineering, Semnan University, Semnan, Iran
author
Rahmat Ollah
Rahmani
کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه تربیت مدرس
author
text
article
2015
per
This paper covers optimization techniques for trusses to find the most efficient cross sections and configuration of joints. The improvement will be achieved by applying changes in one or both of these parameters. Objective functions for optimization is weight and the deflection of the truss’s joints. For optimization of both weight and deflection the NSCSS method is used. This is a powerful method that enables the optimization of huge trusses. The former methods for optimization of the shape or size of the trusses, was done separately and as a single objective while this paper covers a new way via multi-objective methods. For proofing the ability of the represented method in this paper, some standard examples are compared. The comparison of the results shows good accuracy and desirable verity of pareto front.
Iranian Journal of Mechanical Engineering Transactions of ISME
ISME
2538-4775
17
v.
1
no.
2015
40
54
https://jmep.isme.ir/article_27210_3c39aaf73896c6abd8ee8d618ce86ec5.pdf
Manufacturing methods of solid oxide fuel cells (Review article)
Mohsen
Mazrooie
دانشجوی کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه تهران
author
Karen
Abri nia
استاد، دانشکده مهندسی مکانیک، دانشگاه تهران
author
Jalil
Jamali
استادیار، دانشگاه آزاد اسلامی، واحد جامع شوشتر
author
Mehdi
Tafazoli
دانشجوی دکترا، گروه مهندسی مکانیک، دانشگاه صنعتی بابل
author
Majid
Bani Asadi
نویسنده مسئول، استادیار، دانشکده مهندسی مکانیک، دانشگاه تهران
author
text
article
2015
per
Solid oxide fuel cells (SOFCs) are utilized for power generation due to high efficiency, especially in combined cycle with a steam turbine and gas turbine to generate electricity in power plants by minimal amount of pollution. The most important characteristics for this type of the cells for commercialization are consisted of performance, cycle life and cost of the production. The two main factors to achieve the goals are improvement the ingredient material layers (cathode and electrolyte) and optimized procedures for fabrication these layers. Currently, manufacturing methods of SOFC layers are contained tape casting, screen printing, laser pulse, spattering, vapor deposition materials... The purpose of this paper is to investigate the fabrication of solid oxide fuel cell layers by considering the scientific and economic perspectives.
Iranian Journal of Mechanical Engineering Transactions of ISME
ISME
2538-4775
17
v.
1
no.
2015
55
82
https://jmep.isme.ir/article_27211_b4ba8f204be0e87dcdf1bf5464c090f1.pdf
Temperature dependent analysis of sandwich beams with functionally graded face sheets under local loads
Yoones
Mohammadi
عضو هیات علمی/ مدیر گروه / دانشگاه آزاد اسلامی واحد قزوین
author
Mohsen
Bot shekanan Dehkordi
استادیار، دانشکده مهندسی مکانیک، دانشگاه شهرکرد
author
text
article
2015
per
An improved high-order sandwich beam theory is used to analysis of sandwich beams with FG face sheets loaded by central indentor in various temperature conditions. Property distribution in the FG face sheets is according to power law function of FGMs and all properties of them are temperature dependent. In this model, first order shear deformation theory is used for the FG face sheets while three-dimensional elasticity is used for the flexible core. Two spreading length scales are introduced and calculated for defined sandwich beam, which characterized the behavior of sandwich beam under local loads. The theoretical predictions in the present work are compared with FEM results by ANSYS and the results published in the literature for special cases, and reasonable agreement is found between them.
Iranian Journal of Mechanical Engineering Transactions of ISME
ISME
2538-4775
17
v.
1
no.
2015
83
103
https://jmep.isme.ir/article_27212_2f729c7756b0703d31c17b1aeb965d5e.pdf