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Daniel Villanueva, Adrián Sixto, Andrés Feijóo, Antonio Fernández and Edelmiro Miguez
Power curves provided by wind turbine manufacturers are obtained under certain conditions that are different from those of real life operation and, therefore, they actually do not describe the behavior of these machines in wind farms. In those cases wher...
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Chengzhi Liu, Xuli Han and Juncheng Li
In this paper, we exploit an numerical method for solving second order differential equations with boundary conditions. Based on the theory of the analytic solution, a series of spline functions are presented to find approximate solutions, and one of the...
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Eduardo Campos, Rubens Penha Cysne
Pág. 5 - 38
Este artigo avalia a sustentabilidade da dívida pública brasileira usando dados mensais de janeiro de 2003 a junho de 2016 com base na estimação de funções de reação fiscal cujos coeficientes variam ao longo do tempo. Consideramos três métodos de estimaç...
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Ka Kin Lam and Bo Wang
A rapid decline in mortality and fertility has become major issues in many developed countries over the past few decades. An accurate model for forecasting demographic movements is important for decision making in social welfare policies and resource bud...
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Endashaw Tesfaye Woldemariam, Hirpa G. Lemu and G. Gary Wang
Turbines are critical parts in hydropower facilities, and the cross-flow turbine is one of the widely applied turbine designs in small- and micro-hydro facilities. Cross-flow turbines are relatively simple, flexible and less expensive, compared to other ...
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Miaomiao Yu, Hongyong Yuan, Kaiyuan Li and Lizheng Deng
To separate the noise and important signal features of the indoor carbon dioxide (CO2) concentration signal, we proposed a noise cancellation method, based on time-varying, filtering-based empirical mode decomposition (TVF-EMD) with Bayesian optimization...
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P.E. Wolfgang Kuhn
Pág. 1416 - 1429
The planning and design process for training circuits for the automobile industry has not used any standard methodology anywhere in the past. The new 3D alignment for a training course consists of measured individual elements from existing tracks combine...
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V. O. Melnychuk,A. V. Savchuk,M. A. Hrichanyi,I. Yu. Khomenko
Pág. 143 - 146
In the article the videotape recordings of wheel motion on rail track, done during the dynamic tests of carriages, are analyzed. The treatment includes fixing of wheel rim positions in relation to a rail, construction of the spline function of displaceme...
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V. V. Laguta
Pág. 105 - 108
The error of the decision of the first boundery problem for the ordinary differential equation of the second order with a nonlinear right part is defined. The second derivative of defined function is approximated by a linear spline.
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Gang Huang, Min Hu, Xueying Yang and Peng Lin
Multi-UAV cooperative trajectory planning (MUCTP) refers to the planning of multiple flyable trajectories based on the location of each UAV and mission point in a complex environment. In the planning process, the complex 3D space structure increases the ...
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Dongdong Yao and Qunli Xia
In an effort to address the problem of hypersonic morphing vehicles reaching the target while avoiding no-fly zones, an improved predictor?corrector guidance method is proposed. Firstly, the aircraft motion model and the constraint model are established....
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Zhou Yang, Yuwang Xu, Jionglin Jing, Xuepeng Fu, Bofu Wang, Haojie Ren, Mengmeng Zhang and Tongxiao Sun
Particle image velocimetry (PIV) is a widely used experimental technique in ocean engineering, for instance, to study the vortex fields near marine risers and the wake fields behind wind turbines or ship propellers. However, the flow fields measured usin...
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Francesca Pitolli, Chiara Sorgentone and Enza Pellegrino
Differential problems with the Riesz derivative in space are widely used to model anomalous diffusion. Although the Riesz?Caputo derivative is more suitable for modeling real phenomena, there are few examples in literature where numerical methods are use...
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Zhenhua Han, Yingmo Wang, Xinhui Ma, Shugui Liu, Xiaodong Zhang and Guoxiong Zhang
With the development of the modern manufacturing industry, the free-form surface is widely used in various fields, and the automatic detection of a free-form surface is an important function of future intelligent three-coordinate measuring machines (CMMs...
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Chuanwei Zhang, Xinyue Yang, Rui Zhou and Zhongyu Guo
In order to solve the problem of low safety and efficiency of underground mine vehicles, a path planning method for underground mine vehicles based on an improved A star (A*) and fuzzy control Dynamic Window Approach (DWA) is proposed. Firstly, the envir...
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Hongjun Cui, Guang Chen, Minqing Zhu, Yue Su and Jingxuan Liu
A scientifically accurate assessment of tunnel health is the prerequisite for the safe maintenance and sustainability of the in-service road tunnel. The changing trend of tunnel health is not considered in existing research. Most evaluation indicators ar...
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Lingfeng Zhong, Rui Liu, Xiaodong Miao, Yufeng Chen, Songhong Li and Haocheng Ji
Compressors are important components in various power systems in the field of energy and power. In practical applications, compressors often operate under non-design conditions. Therefore, accurate calculation on performance under various operating condi...
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Wenyan Gu, Jinsheng Zhang, Longye Pan, Yegao Qu, Jin-Hwan Choi and Xiangqian Zhu
Many solar panels for spacecrafts are deployed by Tape Spring Hinges (TSHs) which have changeable stiffness. The stiffness of TSH is small when panels are folded, and it becomes large quickly in its deployed status. Since the solar panel is a thin sheet,...
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Mengge Yu, Jiali Liu, Wei Huo and Jiye Zhang
Aiming to improve the comprehensive aerodynamic performance of a high-speed train, a multi-objective shape optimization method for a streamlined train head is proposed in this work. The shape of the streamlined train head is parameterized with some splin...
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Chang-Yong Song
Meta-model sre generally applied to approximate multi-objective optimization, reliability analysis, reliability based design optimization, etc., not only in order to improve the efficiencies of numerical calculation and convergence, but also to facilitat...
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