In consideration of the features of the open-cut and the trenchless methods, the effects of each construction method on the surrounding ground therefore are evaluated through model vibration tests and numerical analysis based on the survey results of existing structures.
Results showed that there were three main sources of error in the numerical analysis, namely the pressure increase in the compression wave, the flow separation from the vehicle body leading to an apparent increase in the vehicle cross-sectional area, and the offset of the running position from the tunnel center.
The numerical analysis quantified the elements constituting structure response during earthquake, such as type of vehicle and its speed, the equivalent natural period and yield seismic coefficient of the structure, structure/vehicle weight ratio, the predominant period of the seismic motion Fig.1.
Increasing the accuracy of micro-pressure wave estimation in tunnels with tunnel entrance hood By identifying the factors which lead to errors in numerical analysis of a compression wave generated when a high-speed train enters a tunnel, it is possible to increase the accuracy of tunnel micro-pressure wave estimations.
For example, there is a current project underway that requires cooperation between the computational physics(science) and numerical analysis(engineering) fields in order to implement calculation code with high execution efficiency, and to perform the necessary large-scale simulations using the code. There are also projects that aim at new research deployments and developments by facilitating organic cooperation among different fields utilizing the same techniques in computational science.
Gear Technology- Romaxtech Gear Technology- for design, analysis and optimisation Advanced gear modelling and analysis tools for a refined design Advanced root stress analysis for thin-rimmed gears Advanced Finite Element numerical analysis tool for assessing gear bending strength released in R17 has now been further extended to include additional capability and enhancements.
To develop diagnostic and countermeasure techniques to improve the disaster-prevention characteristics of industrial complexes, we focused on actual coastal industrial complex facilities and confirmed the earthquake-resistance effects of the countermeasure by the model experiment using the National Research Institute for Earth Science and Disaster Resilience's large shake table(E-Defense) and conducted numerical analyses to re-create the behavior of these facilities.
Also, regarding improving construction methods for existing pile casting through soil improvement work between piles, we conducted centrifuge model tests regarding models of overall cross sections including not only pile casting but also front sheet piles. Moreover, we verified a modeling method based on numerical analysis of each part for application to actual cross sections.
The accuracy of the proposed method was verified using numerical analysis and actual measured acceleration waveforms on the bridge when trains were passing. Results of the verification showed that it was possible to estimate the maximum displacement value, which had been difficult to obtain processing measured waveforms alone, within a 5% error margin, while the error margin in natural frequency and damping coefficient estimation was on average reduced to approximately 1 in 50 minutes compared to the existing method Fig.
By modeling human properties and defining them as information communication problems through numerical analysis and simulation, we aim for an ecosystem in which humans and computers coexist. For this purpose, we are working on the idea of digital nature, which includes research on using interaction with light and sound in space, lasers, high-power ultrasound, magnetic fields, human behavior control, and more.
To analyze random and complex fluctuation according to time development and consider optimization under such random phenomena, we need the latest results of advanced mathematics concerning the theory of stochastic differential equations or statistical inference. Moreover, when we apply the theoretical results to actual technology for capital assets management, techniques of numerical analysis on a large scale at high speed are indispensable.
数値解析と近似。
Numerical analysis and Pade approximants.
数値解析/高速化。
Numerical Analysis/ Acceleration.
メタルフロー数値解析技術。
Metal flow numerical analysis technology.
数値解析でした。
It was numerical analysis.
数値解析(CAE)。
Numerical analysis(CAE).
専門分野:数値解析。
Research Interests: Numerical Analysis.
ケンブリッジ大学数値解析利用~。
University of Cambridge Teaches Numerical Analysis to Undergraduates.
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