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RISS 인기검색어
- 검색키워드
- 저자 : Maosen Cao (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Numerical Investigation of a Liquid-Gas Ejector Used for Shipping Ballast Water Treatment
Song, Xueguan,Cao, Maosen,Shin, Wonhyup,Cao, Wenping,Kang, Sanghoon,Park, Youngchul Hindawi Limited 2014 Mathematical problems in engineering Vol.2014 No.-
<P>Shipping ballast water can have significant ecological and economic impacts on aquatic ecosystems. Currently, water ejectors are widely used in marine applications for ballast water treatment owing to their high suction capability and reliability. In this communication, an improved ballast treatment system employing a liquid-gas ejector is introduced to clear the ballast water to reduce environmental risks. Commonly, the liquid-gas ejector uses ballast water as the primary fluid and chemical ozone as the secondary fluid. In this study, high-pressure water and air, instead of ballast water and ozone, are considered through extensive numerical and experimental research. The ejector is particularly studied by a steady three-dimensional multiphase computational fluid dynamics (CFD) analysis with commercial software ANSYS-CFX 14.5. Different turbulence models (including standardk-ε, RNGk-ε, SST, andk-ω) with different grid size and bubble size are compared extensively and the experiments are carried out to validate the numerical design and optimization. This study concludes that the RNGk-εturbulence model is the most efficient and effective for the ballast water treatment system under consideration and simple change of nozzle shape can greatly improve the ejector performance under high back pressure conditions.</P>
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Li Wei,Zijian Wang,Maosen Cao,Ronghua Fu 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.5
Ultrasonic waves provide a non-destructive and sensitive way to monitor the concrete hydration. However, limited works are reported to monitor the evolution of the mechanical parameter at early ages. In this study, modified piezoelectric aggregates are embedded inside a concrete beam to excite and receive primary waves. A hydration index, namely, the variation of ultrasonic waveform (VUW) is developed to characterize the variation of the transmitted waves during the hydration process. The recorded hydration indices are compared with the compressive strength measured by destructive test at different ages. The results show that the VUW is closer to the compressive strength than the other two traditional hydration indices, ultrasonic velocity and wave packet energy. The proposed VUW provides a simple and accurate way to monitor the concrete hydration at early ages.
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Seismic investigation of pushover methods for concrete piers of curved bridges in plan
Hamid Reza Ahmadi,Nariman Namdari,Maosen Cao,Mahmoud Bayat 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.23 No.1
The use of non-linear analysis of structures in a functional way for evaluating the structural seismic behavior has attracted the attention of the engineering community in recent years. The most commonly used functional method for analysis is a non-linear static method known as the “pushover method”. In this study, for the first time, a cyclic pushover analysis with different loading protocols was used for seismic investigation of curved bridges. The finite element model of 8-span curved bridges in plan created by the ZEUS-NL software was used for evaluating different pushover methods. In order to identify the optimal loading protocol for use in astatic non-linear cyclic analysis of curved bridges, four loading protocols (suggested by valid references) were used. Along with cyclic analysis, conventional analysis as well as adaptive pushover analysis, with proven capabilities in seismic evaluation of buildings and bridges, have been studied. The non-linear incremental dynamic analysis (IDA) method has been used to examine and compare the results of pushover analyses. To conduct IDA, the time history of 20 far-field earthquake records was used and the 50% fractile values of the demand given the ground motion intensity were computed. After analysis, the base shear vs displacement at the top of the piers were drawn. Obtained graphs represented the ability of a cyclic pushover analysis to estimate seismic capacity of the concrete piers of curved bridges. Based on results, the cyclic pushover method with ISO loading protocol provided better results for evaluating the seismic investigation of concrete piers of curved bridges in plan.
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Bayat, Mahmoud,Ahmadi, Hamid Reza,Kia, Mehdi,Cao, Maosen Techno-Press 2019 Advances in concrete construction Vol.7 No.3
In this study, it has been tried to prepare an analytical fragility curves for isolated straight continues highway bridges by considering different spectral intensity measures. A three-span concrete isolated bridge has been selected and the seismic performance of the bridge has been improved by Lead Rubber Bearing (LRB). Incremental Dynamic Analysis (IDA) is applied to the bridge in longitudinal direction. A suite of 14 earthquake ground motions from medium to sever motions are scaled and used for nonlinear time history analysis. Fragility function considers the relationship of earthquake intensity measures (IM) and probability of exceeding certain Damage State (DS). A full three dimensional finite element model of the isolated bridge has been developed and analyzed. A wide range of different intensity measures are selected and the optimal intensity measure which has the less dispersion is proposed.
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Tian Tan,Jinsong Dai,Shengye Lin,Yongjie Cao,Maosen Wang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6
Cabin opening attitude of prefabricated fragment projectiles has a great impact on target damage probability. To address this issue, this study proposed a method for calculating damage probability based on gridding the target, which can estimate target damage probability under different cabin opening attitudes of projectile. To obtain the optimal cabin opening attitude of the projectile, an improved PSO algorithm named S-ACPSO was proposed, which has adaptive adjustment ability predicated on the sigmoid function and the particle diversity. To verify this method, a UAV target example was analyzed. The numerical result showed that the maximum target damage probability was 0.6847 under the optimal attitude. Following this, the influence of attitude parameters on the target damage probability was analyzed, which showed that the method in this study was feasible.
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