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RISS 인기검색어
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- 저자 : Mirdamadi, Hamid Reza (검색결과 5 건)
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Increasing the performance of energy harvesting in vibration mode shapes
Jabbari, Majid,Ghayour, Mostafa,Mirdamadi, Hamid Reza Techno-Press 2016 Advances in computational design Vol.1 No.2
This paper presents a method of design for the energy harvesting of a piezoelectric cantilever beam. Vibration modes have strain nodes where the strain distribution changes in the direction of the beam length. Covering the strain nodes of the vibration modes with continuous electrodes effects a cancellation of the voltages outputs. The use of segmented electrodes avoids cancellations of the voltage for multi-mode vibration. The resistive load affects the voltage and generated power. The optimum resistive load is considered for segmented and continuous electrodes, and then the power output is verified. One of the effective parameters on energy harvesting performance is the existence of concentrated mass. This topic is studied in this paper. Resonance and off-resonance cases are considered for the harvester. In this paper, both theoretical and experimental methods are used for satisfactory results.
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Seyed Ebrahim Vahdat,Said Nategh,Shamsoddin Mirdamadi 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
Microstructure of an alloy has a significant effect on mechanical properties. Deep cryogenic treatment extends life of tool steels because of microstructure changes. In this research, effects of microstructural parameters were studied on tensile toughness of a medium carbon-low alloy tool steel. The results showed that the maximum population density of sub-micron sized secondary carbide was obtained after 36 h of soaking time. Also, amount of secondary carbides increased with soaking or tempering times from 2.18 vol% to 12.87 vol%. In addition, high population density and high content of secondary carbides were responsible for tensile toughness enhancement. Therefore, the best results (12-35% improvement in tensile toughness) were obtained for a specimen, which underwent a full treatment cycle consisting of heating, water quenching, soaking at -196ºC for 36 or 48 h and tempering at 200ºC for 1 or 2 h, respectively.
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Free vibration analysis of multi-directional functionally graded circular and annular plates
Iman Davoodi Kermani,Mostafa Ghayour,Hamid Reza Mirdamadi 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.11
This paper addresses the free vibration of multi-directional functionally graded circular and annular plates using a semianalytical/numerical method, called state space-based differential quadrature method. Three-dimensional elasticity equations are derived for multi-directional functionally graded plates and a solution is given by the semi-analytical/numerical method. This method gives an analytical solution along the thickness direction, using a state space method and a numerical solution using differential quadrature method. Some numerical examples are presented to show the accuracy and convergence of the method. The most of simulations of the present study have been validated by the existing literature. The non-dimensional frequencies and corresponding displacements mode shapes are obtained. Then the influences of thickness ratio and graded indexes are demonstrated on the non-dimensional natural frequencies.
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S. Nouri,S. Sahmani,M. Hadavi,Sh. Mirdamadi 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
Due to having low density as well as high specific modulus and fatigue toughness, Al–Li alloys have been targeted as anadvanced material for using in aerospace applications. In the current investigation, a new heat treatment method namelyas directional quenching process is proposed to improve the mechanical properties of the Al–Li 8090 alloy, the results ofwhich are compared with those of T6 and T8 aging heat treatment techniques. For this purpose, aging process at 170 °C isconducted in all of the three heat treatment methods, but the solutionizing treatment and quenching are performed alonga specific direction in the introduced directional quenching method. The mechanical properties and fracography of crosssectionalfracture pattern of the heat treated samples are studied corresponding to the various heat treatments. Based on theobtained results, it is found that in comparison with the two conventional T6 and T8 heat treatment methods, the proposeddirectional quenching technique has the capability to increase simultaneously both of the ductility and strength of Al–Li 8090alloy. Also, according to the performed finite element based thermal stress analysis, it is observed that a uniform distributionand high volume fraction of strengthening δ′ (Al3Li) precipitates are acquired via the directional quenching technique.
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Sepideh Shariati,Davood Zare,Saeed Mirdamadi 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.2
The production of many secondary metabolitessuch as carotenoids is influenced by the type of carbon andnitrogen sources and C:N ratio applied in culture medium. The present study discusses the role of C:N ratio andscreening of carbon and nitrogen sources using mixtureanalysis design in carotenoids production by Blakesleatrispora. The C:N ratios of 20, 40, and 60 with six nitrogensources were evaluated. Results indicated that limitation ofnitrogen source (C:N of 60) could improve carotenoidsproduction. Six nitrogen and carbon sources were thenscreened using mixture analysis design. The most effectivenitrogen and carbon sources were soybean powder andglucose, respectively. The productivity of carotenoids(983.8 ± 31.5 mg/L) based on consumed nitrogen andcarbon source was 189.10 mg/g soybean powder and19.66 mg/g glucose. Mixture analysis design indicatedsingle carbon and nitrogen source were more effective thana mixture of sources for carotenoids production.
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