Three-Dimensional End-to-End Modeling and Analysis for Graphene-Enabled Terahertz Band Communications

This paper presents a first approximation of the seismic vulnerability of a sixteenth century building which is part of the historical center of Morelia, Mexico. The city was declared World Heritage by United Nations Educational, Scientific and Cultural Organization in 1991. The modeling and analysis of the building was carried out using a three-dimensional elastic tetrahedral finite elements model which was subjected to probabilistic seismic demands with recurrences of 500 yrs and 1000 yrs in addition to real seismic records. The model was able to correctly identify cracking pattern in different parts of the temple due to gravitational forces. High seismic vulnerability of the arched window and the walls of the middle part of the bell tower of the temple was indicated by the seismic analysis of the model.

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Off-Design Behavior Analysis and Operating Curve Design of Marine Intercooled Gas Turbine

Mathematical Problems in Engineering ◽

10.1155/2017/8325040 ◽

2017 ◽

Vol 2017 ◽

pp. 1-14 ◽

Cited By ~ 1

Author(s):

Nian-kun Ji ◽

Shu-ying Li ◽

Zhi-tao Wang ◽

Ning-bo Zhao

Keyword(s):

Steady State ◽

Gas Turbine ◽

Optimization Design ◽

Three Dimensional ◽

Operational Flexibility ◽

Modeling And Analysis ◽

Additional Degree ◽

Performance Space ◽

Mechanical Constraints ◽

Steady State Model

The intercooled gas turbine obtained by adopting an indirect heat exchanger into an existing gas turbine is one of the candidates for developing high-power marine power units. To simplify such a strong coupled nonlinear system reasonably, the feasibility and availability of qualifying equivalent effectiveness as the only parameter to evaluate the intercooler behavior are investigated. Regarding equivalent effectiveness as an additional degree of freedom, the steady state model of a marine intercooled gas turbine is developed and its off-design performance is analyzed. With comprehensive considerations given to various phase missions of ships, operational flexibility, mechanical constraints, and thermal constraints, the operating curve of the intercooled gas turbine is optimized based on graphical method in three-dimensional performance space. The resulting operating curve revealed that the control strategy at the steady state conditions for the intercooled gas turbine should be variable cycle control. The necessity of integration optimization design for gas turbine and intercooler is indicated and the modeling and analysis method developed in this paper should be beneficial to it.

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A Stochastic Hierarchical Population System: Excitement, Extinction and Transition to Chaos

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127421300433 ◽

2021 ◽

Vol 31 (14) ◽

Author(s):

Irina Bashkirtseva ◽

Tatyana Perevalova ◽

Lev Ryashko

Keyword(s):

Mathematical Modeling ◽

Food Chain ◽

Analytical Method ◽

Three Dimensional ◽

Biological Parameters ◽

Top Predator ◽

Population System ◽

Modeling And Analysis ◽

Transition To Chaos ◽

Random Fluctuations

A problem of the mathematical modeling and analysis of noise-induced transformations of complex oscillatory regimes in hierarchical population systems is considered. As a key example, we use a three-dimensional food chain dynamical model of the interacting prey, predator, and top predator. We perform a comparative study of the impacts of random fluctuations on three key biological parameters of prey growth, predator mortality, and the top predator growth. A detailed investigation of the stochastic excitement, noise-induced transition from order to chaos, and various scenarios of extinction is carried out. Constructive abilities of the semi-analytical method of confidence domains in the analysis of the noise-induced extinction are demonstrated.

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End-to-end Modeling and Analysis for Terahertz Wireline Transmission System with Solid Polymer Fiber

ICC 2021 - IEEE International Conference on Communications ◽

10.1109/icc42927.2021.9500551 ◽

2021 ◽

Author(s):

Yiqin Wang ◽

Weijun Gao ◽

Chong Han

Keyword(s):

Transmission System ◽

Solid Polymer ◽

Polymer Fiber ◽

Modeling And Analysis ◽

End To End

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Error Sensitivity Analysis for Machine Tool Based on Three-Dimensional Vector Chain

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.457-458.1562 ◽

2013 ◽

Vol 457-458 ◽

pp. 1562-1565

Author(s):

Qiang Huang ◽

Chan Jun Gao

Keyword(s):

Sensitivity Analysis ◽

Machine Tool ◽

Three Dimensional ◽

Error Modeling ◽

Dimensional Vector ◽

Modeling And Analysis ◽

Vector Operation ◽

Error Sensitivity ◽

Space Error ◽

Error Sensitivity Analysis

Error modeling and analysis can provide some important direction to the machining precision control. According to the characteristics of topology structure on machine tool, a space error model of machine tool and detailed modeling method are presented in this paper, which are based on three-dimensional vector chain. Taking a lathe as an example, the application method of this model in error sensitivity analysis is introduced. By this model, the relationship between the relative error of workpiece-tool and each source error can be solved by ordinary vector operation, and the analysis efficiency should be enhanced greatly.

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