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RISS 인기검색어
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- 저자 : Wenrui Huang (검색결과 3 건)
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Investigation on complete characteristics and hydraulic transient of centrifugal pump
Wuyi Wan,Wenrui Huang 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.10
An improved method was developed to obtain the complete characteristic of centrifugal pump. The conversion formula of complete characteristics is established based on the normal performance curve. An example was presented to illuminate the new method, and the complete characteristic curves of 14SA-10 centrifugal pump were obtained by the new method. The hydraulic transient of the centrifugal pump failure and start-up was simulated by method of characteristics (MOC), which quote the complete characteristics data. The results show that the inversion method is available to obtain the complete pump characteristic curves provided the normal performance curve. For hydraulic transient simulation, more accurate numerical result can be obtained, if the new model is adopted to convert the experimental normal performance curve to complete characteristics curve of centrifugal pump.
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Meng Tianchuang,Yang Tianhong,Huang Jin,Jin Wenrui,Zhang Wei,Jia Yifan,Wan Keqian,Xiao Gang,Yang Diange,Zhong Zhihua 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.2
The recent proliferation of intelligent technologies has promoted autonomous driving. The autonomous parking system has become a popular feature in autonomous driving. Hybrid A-star algorithm is a commonly used path planning algorithm for its simplicity to deploy and the good characteristics of the generated paths in the practical engineering. To further enhance the path safety and efficiency of path planning in the autonomous parking system, this paper proposes an improved hybrid A-star algorithm through the safety-enhanced design and the efficiency-enhanced design. The safety-enhanced design integrates the Voronoi field potential into the path searching stage to take more account of path safety. The efficiency-enhanced design proposes a multi-stage dynamic optimization strategy which divides the path planning into multiple stages and performs dynamic optimization in each stage. Through simulation experiments, it is verified that the proposed improved algorithm not only generates a much safer path which stays farther from the obstacles but also significantly improves the searching efficiency in terms of time and space, merely at a finite cost of pre-processing work which can also be repeatedly utilized. We hope this paper will promote relative research on path planning in autonomous parking and serve as a reference for the practical engineering.
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Cho, Seungho,Yun, Chao,Kim, Yoon Seo,Wang, Han,Jian, Jie,Zhang, Wenrui,Huang, Jijie,Wang, Xuejing,Wang, Haiyan,MacManus-Driscoll, Judith L. Elsevier 2018 Nano energy Vol.45 No.-
<P><B>Abstract</B></P> <P>Lead-free perovskite oxide thin films prepared by alloying of titanates and materials with lower melting points are shown to have enhanced ferroelectric and dielectric properties. BaTiO<SUB>3</SUB> (or SrTiO<SUB>3</SUB>) with 25% addition of BiFeO<SUB>3</SUB> has much improved crystalline perfection because of the lower melting point of the BiFeO<SUB>3</SUB> giving enhanced growth kinetics. The maximum dielectric peak temperature of BaTiO<SUB>3</SUB> is increased by ~ 200°C and leakage currents are reduced by up to a factor of ~ 100. The loss tangent reduces up to 300°C, with a factor of > 14 reduction at room temperature. The dielectric breakdown strength is higher by a factor of ~ 3 (> 2200kVcm<SUP>−1</SUP>) and from room temperature up to 500°C the dielectric constant is > 1000. Also, a low variation of dielectric constant of ~ 9% from room temperature to 330°C is obtained, compared to ~ 110% for BaTiO<SUB>3</SUB>. The maximum polarization (<I>P</I> <SUB>max</SUB>) is double that of BaTiO<SUB>3</SUB>, at 125.3μCcm<SUP>−2</SUP>. The film has high energy storage densities of > 52Jcm<SUP>−3</SUP> at 2050kVcm<SUP>−1</SUP>, matching Pb-based ferroelectric films. The strongly improved performance is important for applications in energy storage and in high temperature (up to 300°C) capacitors as well as wider application in other electronic and energy technologies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High crystallinity is achieved by mixing titanate with a lower melting point material. </LI> <LI> The film with enhanced crystallinity has strongly enhanced dielectric properties. </LI> <LI> The film has high energy storage densities of > 52Jcm<SUP>−3</SUP>, matching Pb-based films. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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