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Mohammad Azadi,Mahboobeh Azadi 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.10
Nonlinear transient heat transfer and thermoelastic stress analyses of a thick-walled FGM cylinder with temperaturedependent materials are performed by using the Hermitian transfinite element method. Temperature-dependency of the material properties has not been taken into account in transient thermoelastic analysis, so far. Due to the mentioned dependency, the resulting governing FEM equations of transient heat transfer are highly nonlinear. Furthermore, in all finite element analysis performed so far in the field, Lagrangian elements have been used. To avoid an artificial local heat source at the mutual boundaries of the elements, Hermitian elements are used instead in the present research. Another novelty of the present paper is simultaneous use of the transfinite element method and updating technique. Time variations of the temperature, displacements, and stresses are obtained through a numerical Laplace inversion. Finally, results obtained considering the temperature-dependency of the material properties are compared with those derived based on temperature independency assumption. Furthermore, the temperature distribution and the radial and circumferential stresses are investigated versus time, geometrical parameters and index of power law. Results reveal that the temperature-dependency effect is significant.
NVH analysis and improvement of a vehicle body structure using DOE method
Shahram Azadi,Mohammad Azadi,Farshad Zahedi 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.11
The improvement of a vehicle body structure under the constraint of noise, vibration and harshness (NVH) behavior is investigated by using design of experiments (DOE) method. First, car body geometry is modeled in CATIA and meshed in HYPERMESH software. Then, a modal analysis between 0-50 Hz is done by MSC NASTRAN. A frequency map of the body is extracted and compared with a reference map to identify shortcomings. By using factorial and response surface Methods (RSM), optimization of the NVH performance is accomplished. An algorithm is proposed to improve the car NVH behavior. At last, in order to verify the present algorithm, forced vibration is analyzed under real road inputs for the model before and after improvement.
Azadi, Pejman,Otang, Ntui Valentaine,Chin, Dong Poh,Nakamura, Ikuo,Fujisawa, Masaki,Harada, Hisashi,Misawa, Norihiko,Mii, Masahiro The Korean Society of Plant Biotechnology 2010 Plant biotechnology reports Vol.4 No.4
Lilium ${\times}$ formolongi was genetically engineered by Agrobacterium-mediated transformation with the plasmid pCrtZW-N8idi-crtEBIY, which contains seven enzyme genes under the regulation of the CaMV 35S promoter. In the transformants, ketocarotenoids were detected in both calli and leaves, which showed a strong orange color. In transgenic calli, the total amount of carotenoids [133.3 ${\mu}g/g$ fresh weight (FW)] was 26.1-fold higher than in wild-type calli. The chlorophyll content and photosynthetic efficiency in transgenic orange plantlets were significantly lowered; however, after several months of subculture, they had turned into plantlets with green leaves that showed significant increases in chlorophyll and photosynthetic efficiency. The total carotenoid contents in leaves of transgenic orange and green plantlets were quantified at 102.9 and 135.2 ${\mu}g/g$ FW, respectively, corresponding to 5.6- and 7.4-fold increases over the levels in the wild-type. Ketocarotenoids such as echinenone, canthaxanthin, 3'-hydroxyechinenone, 3-hydroxyechinenone, and astaxanthin were detected in both transgenic calli and orange leaves. A significant change in the type and composition of ketocarotenoids was observed during the transition from orange transgenic plantlets to green plantlets. Although 3'-hydroxyechinenone, 3-hydroxyechinenone, astaxanthin, and adonirubin were absent, and echinenone and canthaxanthin were present at lower levels, interestingly, the upregulation of carotenoid biosynthesis led to an increase in the total carotenoid concentration (+31.4%) in leaves of the transgenic green plantlets.
Stability of mixed additive-quadratic Jensen type functional equation in various spaces
Azadi Kenary, H.,Je Cho, Y. Pergamon Press ; Elsevier Science Ltd 2011 COMPUTERS & MATHEMATICS WITH APPLICATIONS - Vol.61 No.9
In this paper, we prove the generalized Hyers-Ulam stability of the following mixed additive-quadratic functional equation: 2f(x+y2)+f(x-y2)+f(y-x2)=f(x)+f(y) in various spaces.
Adaptive integrated control design for vehicle dynamics using phase-plane analysis
Shahram Azadi,Masoud Naghibian,Reza Kazemi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
This study designs an adaptive integrated control. The control system includes two strategies of individual optimal linear quadraticregulator: one to improve vehicle maneuverability and another to improve vehicle stability. The integration is based on the vehicle dynamicvariables in the phase plane. The controller can adapt itself by changing gains and integration law as vehicle mass and road frictionchange. The proper gains and integration law are determined for four special conditions: dry road-curb weight, dry road-gross weight,wet road-curb weight, and wet road-gross weight. These conditions are then expanded for every value of vehicle mass and road frictionthrough fuzzy logic and Sugeno estimator. Simulation results show that considerable improvements are achieved in vehicle dynamicperformance through the adaptive integrated control system.
Effect of parameters on roll dynamic response of an articulated vehicle carrying liquids
Shahram Azadi,Ali Jafari,Masoud Samadian 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.3
Directional response and roll stability characteristics of a partly filled tractor semi-trailer vehicle, with cylindrical tank, under differentparameters and conditions are investigated. The effective parameters and conditions in the stability of a tractor semi-trailer carrying liquidcan be considered as filled volume, kinematic viscosity of liquid cargo and vehicle steering input. The dynamic interaction of liquid cargowith the tractor semi-trailer vehicle is evaluated by integrating a dynamic slosh model of the partly filled tank with five-degrees-offreedomof a tractor semi-trailer tank model. The dynamic fluid slosh within the tank is modeled using three-dimensional Navier-Stokesequations, coupled with the volume-of-fluid equations and analyzed using FLUENT software. The coupled tank-vehicle model is subsequentlyanalyzed to determine the roll stability characteristics for different conditions and maneuvers. The results show effects of parametervariations on roll stability of the vehicle carrying liquid and also fluid's behavior in interaction with a vehicle's dynamics.