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Optimization of Nonlinear Vibration Characteristics for Seismic Isolation Rubber

Computer Modeling in Engineering & Sciences 2017年第1期113卷 1-15页

作者： A.Takahashi T.Shibata K.motoyama K.Misaji Nihon university College of Industrial TechnologyDept.of Mathematical Information EngineeringJapan. Mississippi State university U.S.A.

A method for reducing the damage to a structure caused by an earthquake namely,using laminated rubber for seismic isolation is proposed,and the vibration characteristics of the rubber(which minimizes the seismic response of the structure during an earthquake)is optimized.A method called“Equivalent Linear System using Restoring Force Model of Power Function Type”(PFT-ELS)is applied to nonlinear vibration analysis of the *** that analysis,a building with 15 layers of the laminated rubber is *** seismic response of the building is analyzed,and the usefulness of the laminated rubber is demonstrated by comparing the seismic responses in the cases with and without the laminated *** addition,the hysteresis restoring-force characteristic of the laminated rubber,which minimizes the seismic response of the building,was optimized by using a genetic algorithm(GA).Based on these results,the optimum restoring-force characteristic for different earthquakes was *** a result,it was clarified that the developed optimization method can determine the vibration characteristics of the laminated rubber for minimizing the damage to the structure in the design phase.

关键词： Seismic-isolation laminated rubber high-rise-building structure PFT-ELS seismic-response analysis long-period earthquake

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Design of lightweight magnesium car body structure under crash and vibration constraints

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Journal of Magnesium and Alloys 2014年第2期2卷 99-108页

作者： Morteza Kiani Imtiaz Gandikota Masoud Rais-Rohani Keiichi motoyama Engineering Technology Associates Inc.(ETA) MI 48084USA Center for Advanced Vehicular Systems Mississippi State UniversityMS 39762USA Department of Aerospace Engineering Mississippi State UniversityMS 39762USA

Car body design in view of structural performance and lightweighting is a challenging task due to all the performance targets that must be satisfied such as vehicle safety and ride *** this paper,material replacement along with multidisciplinary design optimization strategy is proposed to develop a lightweight car body structure that satisfies the crash and vibration criteria while minimizing *** finite element simulations,full frontal,offset frontal,and side crashes of a full car model are evaluated for peak acceleration,intrusion distance,and the internal energy absorbed by the structural *** addition,the first three fundamental natural frequencies are combined with the crash metrics to form the design *** wall thicknesses of twenty-two parts are considered as the design *** Hypercube Sampling is used to sample the design space,while Radial Basis Function methodology is used to develop surrogate models for the selected crash responses at multiple sites as well as the first three fundamental natural frequencies.A nonlinear surrogate-based optimization problem is formulated for mass minimization under crash and vibration *** Sequential Quadratic Programming,the design optimization problem is solved with the results verified by finite element *** performance of the optimum design with magnesium parts shows significant weight reduction and better performance compared to the baseline design.

关键词： Multidisciplinary design optimization Magnesium structure Car body structure Crashworthiness Vibration Vehicle design

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Anthropogenic trace metals in an ice core at Vestfonna,Svalbard, Norway

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Chinese Journal of Polar Science 2003年第1期14卷 41-47页

作者： Sumito Matoba Hideaki motoyama Hideki Narita Okitsugu Watanabe National Institute of Polar Research National Institute of Polar ResearchInstitute of Low Temperature ScienceNational Institute of Polar Research Tokyo 173-8515 Japan National Institute for Environmental Studies Ibaraki 305-8506 JaTokyo 173-8515 JapanSapporo 060-0819 Japan Research Institute for Humanity and Nature Kyoto 602-0878JapanTokyo 173-8515 Japan

A 211 m depth ice core observation was carried out at the top of the Vestfonna Ice Cap in Nordaustlandet, Svalbard, Norway in 1995. Chronology of the ice core was determined by tritium analysis and comparison to the volcanic eruption of Laki; the resulting accumulation rate is 0.34 0.35 m water eq.·yr -1 for the last 400 year. Concentrations of Al, V, Cr, Fe, Cu, Zn, As, Ag, Cd, Pb and u in an ice core have been determined by an inductively coupled plasma mass spectrometry (ICP MS) with a desolvated micro concentric nebulizer, which is a recent development and can achieve high sensitivity with low uptake rate of 60 mL/min. The concentrations of Pb, Cu, and Zn had increased from 1940s declined from 1970s to present. However, the profiles of Pb, Cu, and Zn were different and they seem to be influenced by the difference of sources. Since the ratios between Cu, Pb, and Zn in Svalbard is similar to that in French Alps, the source area of these elements is estimated to be Europe.

关键词： Ice core heavy metal Svalbard ICP MS.

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