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2017
No.3
Published:02 June 2017
 
 
 
Current Issue Just Accepted Featured article Archive
  02 June 2017, Volume 22 Issue 3 Previous Issue   
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Numerical Study on Flow Structure of a Shallow Laminar Round Jet
CHEN Ke* (陈科), ZHAO Kai (赵恺), YOU Yunxiang (尤云祥)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 257-264.   DOI: 10.1007/s12204-017-1830-8
Abstract   PDF (0KB)
The evolution mechanism and characteristics of the submerged laminar round jet in a viscous homogenous shallow water layer are investigated through computational modeling. The laminar mode is used to solve the Navier-Stokes equations. In order to visualize the formation and evolution of the flow pattern, the volume of fluid (VOF) method is adopted to simulate the free surface of the water layer below the air and to trace the jet fluid. The results show that the jet forms a class of quasi-two-dimensional (Q2D) vortex structures in the ambient fluid with unequal influence from the bottom wall and free surface. The time dependence of three parameters, defined for the flow pattern as jet length, spiral radius and pattern length, is investigated quantitatively in their non-dimensional forms. Three different Reynolds numbers and two injection durations are further considered to discuss their influence on the flow pattern.
Hybrid Process of Fabricating High-Quality Micro Wine-Glass Fused Silica Resonators
XING Yaliang (邢亚亮), ZHANG Weiping* (张卫平), TANG Jian (唐健),SUN Dianjun (孙殿俊), LIU Zhaoyang (刘朝阳), OU Bin (欧斌)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 274-279.   DOI: 10.1007/s12204-017-1832-6
Abstract   PDF (0KB)
A new hybrid method, which combines improved glass-blown technology with wet etching, is reported to fabricate micro wine-glass resonators with high-quality fused silica. The optimum placement is compared to achieve the resonators with good shell shape. The typical shell diameter is about 4mm and its thickness covers from dozens to hundreds of micrometers. The etching rates in corrosion solutions with different ratios and at different thicknesses of hemispherical shells are studied. We also conclude how to precisely control the thickness. The corrosion solutions with different ratios of HF solution to NH4F solution make the spherical shells rougher in different degrees. The best roughness is 0.581 nm in the 1 : 8 ratio corrosion solution while the original roughness is 0.537 nm. This fact shows that the resonator remains atomically smooth surface. Based on the glassblowing spherical fused silica structure, the thickness of the resonator is effectively controlled by buffered oxide etch (BOE) technology according to the measured etching rate. The measured resonant frequency of the hemispherical shell at ambient pressure and room temperature is 1.75 kHz of rocking mode which is close to the simulated frequency. Using such a low-cost hybrid approach, we can fabricate high-quality microscale resonators in batch.
Research on Reduction of Fe2O3 by Biomass Sawdust
LIU Xiaominga,b* (刘晓明), ZHANG Hongleia (张宏雷), LI Suqina (李素芹),LI Dongshenga (李东升), HUANG Dongboa (黄冬波)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 280-285.   DOI: 10.1007/s12204-017-1833-5
Abstract   PDF (0KB)
The research on biomass reduction of Fe2O3 was carried out by using sawdust as reductant. The direct reducing agents in the biomass magnetization process were determined by comparing various biomass pyrolysis products with the reduction degree (divalent iron content in total iron), reduction temperature range and valence change of Fe2O3 in the reduction process. The microstructure variation of Fe2O3 at different stages was also analyzed by scanning electron microscopy (SEM). Nonisothermal thermogravimetric analysis (TGA) was applied to explore the thermal reduction process. The results show that the direct reducing substances in the biomass reaction with Fe2O3 are H2 and bio-oil, and the reduction process can be divided into two steps: biomass pyrolyzing to release H2 and bio-oil, and reductive volatiles reacting with Fe2O3. The two steps are relatively independent. The kinetic of the reduction reaction follows a first-order reaction kinetic model, with 88.99 kJ/mol activation energy and 9.55 × 108 min ?1 frequency factor.
Observer-Based Adaptive Neural Iterative Learning Control for a Class of Time-Varying Nonlinear Systems
WEI Jianming1* (韦建明), ZHANG Youan2 (张友安), LIU Jingmao3 (刘京茂)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 303-312.   DOI: 10.1007/s12204-017-1836-2
Abstract   PDF (0KB)
In this paper an adaptive iterative learning control scheme is presented for the output tracking of a class of nonlinear systems. An observer is designed to estimate the tracking errors. A mixed time domain and s-domain representation is constructed to derive an error model with relative degree one for our purpose. And time-varying radial basis function neural network is employed to deal with system uncertainty. A new signal is constructed by using a first-order filter, which removes the requirement of strict positive real (SPR) condition and identical initial condition of iterative learning control. Based on property of hyperbolic tangent function, the system tracing error is proved to converge to the origin as the iteration tends to infinity by constructing Lyapunov-like composite energy function, while keeping all the closed-loop signals bounded. Finally, a simulation example is presented to verify the effectiveness of the proposed approach.
Human Machine Collaborative Support Scheduling System of Intelligence Information from Multiple Unmanned Aerial Vehicles Based on Eye Tracker
JIAN Lixuan* (简立轩), YIN Dong (尹栋), SHEN Lincheng (沈林成), NIU Yifeng (牛轶峰)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 322-328.   DOI: 10.1007/s12204-017-1838-0
Abstract   PDF (0KB)
Many human-machine collaborative support scheduling systems are used to aid human decision making by providing several optimal scheduling algorithms that do not take operator’s attention into consideration. However, the current systems should take advantage of the operator’s attention to obtain the optimal solution. In this paper, we innovatively propose a human-machine collaborative support scheduling system of intelligence information from multi-UAVs based on eye-tracker. Firstly, the target recognition algorithm is applied to the images from the multiple unmanned aerial vehicles (multi-UAVs) to recognize the targets in the images. Then, the support system utilizes the eye tracker to gain the eye-gaze points which are intended to obtain the focused targets in the images. Finally, the heuristic scheduling algorithms take both the attributes of targets and the operator’s attention into consideration to obtain the sequence of the images. As the processing time of the images collected by the multi-UAVs is uncertain, however the upper bounds and lower bounds of the processing time are known before. So the processing time of the images is modeled by the interval processing time. The objective of the scheduling problem is to minimize mean weighted completion time. This paper proposes some new polynomial time heuristic scheduling algorithms which firstly schedule the images including the focused targets. We conduct the scheduling experiments under six different distributions. The results indicate that the proposed algorithm is not sensitive to the different distributions of the processing time and has a negligible computational time. The absolute error of the best performing heuristic solution is only about 1%. Then, we incorporate the best performing heuristic algorithm into the human-machine collaborative support systems to verify the performance of the system.
A Generalized Self-Consistent Model for Interfacial Debonding Behavior of Fiber Reinforced Rubber Matrix Sealing Composites
ZHANG Bin1,2* (张斌), YU Xiaoming1 (宇晓明), GU Boqin3 (顾伯勤)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 343-348.   DOI: 10.1007/s12204-017-1841-5
Abstract   PDF (0KB)
This paper presents an experimental and numerical study of short-fiber-reinforced rubber matrix sealing composites (SFRC). The transverse tensile stress-strain curves of SFRC are obtained by experiments. Based on the generalized self-consistent method, a representative volume element (RVE) model is established, and the cohesive zone model is employed to investigate the interfacial failure behavior. The effect of interphase properties on the interfacial debonding behavior of SFRC is numerically investigated. The results indicate that an interphase thickness of 0.3 μm and an interphase elastic modulus of about 502MPa are optimal to restrain the initiation of the interfacial debonding. The interfacial debonding of SFRC mainly occurs between the matrix/interphase interface, which agrees well with results by scanning electron microscope (SEM).
Research and Application of New Threshold De-noising Algorithm for Monitoring Data Analysis in Nuclear Power Plant
CUI Yan* (崔妍), CHEN Shijun (陈世均), QU Meng (瞿勐), HE Shanhong (何善红)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 355-360.   DOI: 10.1007/s12204-017-1843-3
Abstract   PDF (0KB)
Under the complex condition of nuclear power plant, all kinds of influence factors may cause distortion of on-line monitoring data. It is essential that on-line monitoring data should be de-noised in order to ensure the accuracy of diagnosis. Based on the research of wavelet analysis and threshold de-noising, a new threshold denoising method based on Mallat transform is proposed. This method adopts factor weighing method for threshold quantization. Through the specific case of nuclear power plant, it is verified that the algorithm is of validity and superiority.
Adomian’s Method Applied to Solve Ordinary and Partial Fractional Differential Equations
HAO Lili1,2 (郝丽丽), LI Xiaoyan1* (李晓艳), LIU Song1 (刘松), JIANG Wei1 (蒋威)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 371-376.   DOI: 10.1007/s12204-017-1846-0
Abstract   PDF (0KB)
This paper presents a method to solve the problems of solutions for integer differential and partial differential equations using the convergence of Adomian’s Method. In this paper, we firstly use the convergence of Adomian’s Method to derive the solutions of high order linear fractional equations, and then the numerical solutions for nonlinear fractional equations. we also get the solutions of two fractional reaction-diffusion equations. We can see the advantage of this method to deal with fractional differential equations.
Automatic Outer Surface Extraction of Femoral Head in CT Images
WAN Daqian1 (万大千), WANG Dong2 (王东), MA Anbang4 (马安邦),DAI Kerong2,4 (戴尅戎), AI Songtao3* (艾松涛), WANG Liao2* (王燎)
Journal of shanghai Jiaotong University (Science). 2017, 22 (3): 377-384.   DOI: 10.1007/s12204-017-1847-z
Abstract   PDF (0KB)
Computer-aided hip surgery planning and implant design applications require accurate segmentation of femoral head and proximal acetabulum. An accurate outer surface extraction of femoral head using marching cubes algorithm remains challenging due to deformed shapes and extremely narrow inter-bone regions. In this paper, we present an automatic and fast approach for segmentation of femoral head and proximal acetabulum which leads to accurate and compact representation of femoral head using marching cubes algorithm. At first, valley-emphasized images are constructed from original images so that valleys stand out in high relief. Otsu’s multiple thresholding technique is applied to seperate the images into bone and non-bone classes. Region growing method and threedimensional (3D) morphological operations are performed to fill holes in the bone. In the reclassification process, the bone regions are further segmented, and the boundaries of the bone regions are further refined based on Bayes decision rule. Finally, marching cubes algorithm is applied to reconstruct a 3D model and extract the outer surface of femoral head and proximal acetabulum. Experimental results show that this method is an accurate segmentation technique for femoral head and proximal acetabulum and it can be applied as a tool in medical practice.

J Shanghai Jiaotong Univ Sci

Compliant Assembly Modeling and Deformation Analysis Considering Macro Residual Stress in Engineering Component
Li-na ZHANG, Hua WANG, Shu-hui LI
J Shanghai Jiaotong Univ Sci, 2015 Vol. 20 (6): 641-648    DOI: 10.1007/s12204-015-1671-2
 
2017
Vol.22
No.2 
2017-03-31
pp.129-256
No.1
2017-02-28
pp.001-128
2016
Vol.21
No.3 
2016-06-30
pp.257-384
No.2
2016-04-15
pp.129-256
No.1
2016-02-29
pp.1-128
2015
Vol.20
No.6 
2016-01-20
pp.641-762
No.5
2015-10-28
pp.513-640
No.4
2015-08-29
pp.385-512
No.3
2015-06-27
pp.257-384
No.2
2015-04-30
pp.129-256
No.1
2015-02-28
pp.001-128
2014
Vol.19
No.6 
2014-12-31
pp.641-762
No.5
2014-10-31
pp.513-640
No.4
2014-08-30
pp.385-512
No.3
2014-06-30
pp.257-384
No.2
2014-04-30
pp.129-0
No.1
2014-01-15
pp.1-128
2013
Vol.18
No.6 
2013-12-31
pp.641-762
No.5
2013-10-31
pp.513-640
No.4
2013-08-28
pp.385-512
No.3
2013-06-28
pp.257-384
No.2
2013-04-30
pp.129-256
No.1
2013-02-28
pp.1-128
2012
Vol.17
No.6 
2012-12-31
pp.643-764
No.5
2012-10-30
pp.513-642
No.4
2012-08-30
pp.385-512
No.3
2012-06-30
pp.257-384
No.2
2012-04-28
pp.129-256
No.1
2012-02-29
pp.1-128
2011
Vol.16
No.6 
2011-12-30
pp.641-762
No.5
2011-10-29
pp.513-640
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