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- 저자 : Pengju Li (검색결과 4 건)
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Forward Matching Fusion Algorithm for PDR based on Geomagnetic Fingerprint Map
Yuke Li,Pengju Wang,Tong Li,Yinxuan Liu,Shigeyuki Tateno 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
Aiming at the problem that indoor positioning using pedestrian dead reckoning (PDR) algorithm will lead to error accumulation and the precision of built-in sensors of smartphones is not high enough, indoor positioning research based on the fusion of geomagnetic positioning and PDR positioning algorithm is proposed. A Kriging interpolation based fusion matching algorithm was used to construct geomagnetic fingerprint map to reduce the time spent in data sampling. The fusion positioning is realized by combining the PDR positioning with the hybrid matching algorithm of lattice matching and sequence matching. The improved algorithm solves the problems of global search for geomagnetic sequence matching and PDR positioning error accumulation in traditional methods, improves the positioning accuracy and solves the problems that through the wall or even out of the map caused by the error accumulation. Experimental results show that the maximum positioning error of the proposed algorithm is less than 1m in the complex movement of 120 steps for 60m. The probability of positioning accuracy less than 0.5m is 85%. This can meet the needs of ordinary indoor positioning.
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Jianping Chen,Wenyong Tang,Pengju Huang,Li Xu 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.57 No.2
The paper is devoted to study a mesh-free analysis method of structural elements of engineering structures based on B-spline Wavelet Basis Function. First, by employing the moving-least square method and the weighted residual method to solve the structural displacement field, the control equations and the stiffness equations are obtained. And then constructs the displacement field of the structure by using the m-order B-spline wavelet basis function as a weight function. In the end, the paper selects the plane beam structure and the structure with opening hole to carry out numerical analysis of deformation and stress. The Finite Element Method calculation results are compared with the results of the method proposed, and the calculation results of the relative error norm is compared with Gauss weight function as weight function. Therefore, the clarification verified the validity and accuracy of the proposed method.
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Mechanical Properties and Microstructure of Sulfur Polymer Composite Containing Basalt Fibers
Bingang Wang,Ju Zhang,Changwang Yan,Jie Li,Pengju Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
The paper aims to investigate the mechanical properties and microstructure of sulfur polymer composite (SPC) containing basalt fiber (BF). The compressive strength fc, splitting tensile strength ft, and flexural strength ff of SPC were tested at different BF contents of 0-3% and aspect ratios of 353 and 706. Meanwhile, the microstructure characteristics of SPC, i.e., the interfacial transition zone (ITZ) structure of SPC, bonding of BF with SPC, pore size distribution, and porosity, were analyzed. The results indicated that the inclusion of BF lowed the compressive strength of SPC; for SPC at a given BF content, the fc with 706 l/d was lower than that with 353 l/d. Meanwhile, the ft and ff of SPC with 353 l/d increased with BF content; for l/d of 706, the ft and ff increased with BF content before 2.5% then decreased with the increase in BF content; compared to 353 l/d, 706 l/d was more effective to improve the ft and ff of SPC. Additionally, an appropriate amount of BF was beneficial to improve the ITZ structure of SPC and bonding performance between BF and the matrix, and the porosity and pore size of SPC increased with BF content and l/d.
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Taotao Ai,Ning Yu,Xiaoming Feng,Niansuo Xie,Wenhu Li,Pengju Xia 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.1
Ti2AlC/TiAl in situ composites were fabricated via a reaction Hot-Pressing Process using Ti3AlC2, Ti, and Alpowders as initial materials. The effect of Ti2AlC content on the phases and microstructure of the as-sinteredcomposites was investigated by XRD and SEM. The mechanical properties such as Vickers hardness, flexuralstrength and fracture toughness of the as-sintered composites were also tested. The products consisted ofTi2AlC, γ-TiAl and α2-Ti3Al as the major phases. Ti2AlC reinforcements were mainly distributed in the grainboundaries, resulting in obvious γ+α2 grain refinement. With increasing Ti3AlC2 content (up to 5 wt%), theVickers hardness, flexural strength and fracture toughness of the as-sintered composite reached the maximumvalues of 3.7 GPa, 651.5 MPa, and 10.89 MPa·m1/2, respectively. Analysis of fracture surface and crackpropagation paths indicated that crack deflection and crack bridging of the in situ precipitated Ti2AlC phasesobtained by decomposing Ti3AlC2 were the main reasons for the observed composite toughening.
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