Nanchang Hangkong University

www.nchu.edu.cn
Nanchang, China

Nanchang Hangkong University , also Nanchang Aviation University, is located in Nanchang City, Jiangxi Province, People's Republic of China. It is an engineering-based multidisciplinary university.NCHU now has over 1,200 professional teachers. At present, the total number of registered students is 21,000, of whom 19,000 undergraduates, 1,095 postgraduates, and over 1,200 vocational students. NCHU gives first priority to the all-around development of students as well as the quality of education, and directs its efforts to teaching innovations. As a result, it has made great achievements in the cultivation of talents and its employment rate of graduate ranks first in Jiangxi Province. Wikipedia.

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Gai S.,Nanchang Hangkong University
Neural Processing Letters | Year: 2017

Color textures are among the most important visual attributes in image analysis. From the practical point view of color texture image analysis, this paper proposes an effective multi-scale color texture classification algorithm that is rotation and scale invariant using non-marginal color monogenic wavelet transform. The proposed algorithm exploits the color monogenic wavelet transform to obtain multi-scale representation of training samples for each texture class. The coefficients of color monogenic wavelet transform represent a magnitude and three phases: two phases encode local color information while the third contains geometric information of color texture image. The multi-scale feature vector is composed of mean value, standard deviation, energy and entropy at different scales of each of the directional sub-bands. The experimental results of average correct classification rates are 98.67, 99.08 and (Formula presented.) which are obtained from different color texture databases demonstrate its superior performance and robustness of the proposed classifier. The proposed color texture feature vector is also shown to be effective for color texture classification. © 2017 Springer Science+Business Media New York


Sheng Z.-Q.,Nanchang Hangkong University
Applied Thermal Engineering | Year: 2017

Numerical investigation of the jet mixing of a sword alternating-lobe nozzle with lobed and nail-like spoilers located at the lobe peaks was conducted to analyse the effect of different lobe peak spoilers on the pumping ratio, mixing effectiveness, and total pressure recovery coefficient. It was found that suitable designed nail-like spoilers can improve the performance of a lobed nozzle adopted in infrared suppressors. It was concluded that the mixing is dominated by large-scale heat and mass transfer. It was suggested that a high performance lobed nozzle can be produced by optimising the large-scale heat and mass transfer in mixing process. © 2017 Elsevier Ltd


Zheng Y.G.,Nanchang Hangkong University
International Journal of Bifurcation and Chaos | Year: 2013

The dynamical transitions resulting from time delay in single Hindmarsh-Rose system are investigated in the present paper. As the time delay varies, the change of the structure of slow manifold is first formulated by using the method of stability switch. Then, the delay-induced dynamical transitions are investigated through the analysis of geometric singular perturbation, and in several case studies, the mechanism of the dynamical transitions is illuminated. Numerical results demonstrate the validity of the theoretical results. © World Scientific Publishing Company.


Wang L.,Nanchang Hangkong University | Gai S.,Nanchang Hangkong University
Contemporary Physics | Year: 2014

The amount of digital data today has been increasing at a phenomenal rate due to the widespread digitalisation service in almost every industry. The need to store such ever-increasing data aggressively triggers the requirement to augment the storage capacity of the conventional storage technologies. Unfortunately, the physical limitations that conventional forms face have severely handicapped their potential to meet the storage need from both consumer and industry point of view. The focus has therefore been switched into the development of the innovative data storage technologies such as scanning probe memory, nanocrystal memory, carbon nanotube memory, DNA memory, and organic memory. In this paper, we review the physical principles of these emerging storage technologies and their superiorities as the next generation data storage device, as well as their respective technical challenges on further enhancing the storage capacity. We also compare these novel technologies with the mainstream data storage means according to the technology roadmap on areal density. © 2014 Taylor & Francis.


In this paper, a solution to the problem of finding the shape of piezoelectric modal sensors for non-uniform EulerBernoulli beams with rectangular cross-sections is proposed by using the differential transformation method (DTM). A general expression for designing the shape of a piezoelectric modal sensor is presented, in which the output signal of the designed sensor is proportional to the response of the target mode. The modal sensor shape is expressed as a linear function of the second spatial derivative of the structural mode shape function as well as the beam width and thickness function. Based on the DTM and employing some simple mathematical operations, the closed-form series solution of the second spatial derivative of the mode shapes for beams consisting of an arbitrary number of steps can be determined through a recursive way. The solution is obtained by solving a set of algebraic equations with only five unknown parameters. Furthermore, the method can be extended to obtain an approximate solution of the second spatial derivative of the mode shapes for any type of non-uniform beams. Then the shapes of the piezoelectric modal sensors for arbitrary non-uniform EulerBernoulli beam with rectangular cross-section are obtained. Finally, several numerical examples are given to demonstrate the feasibility of the proposed modal sensors with various boundary conditions. © 2012 Elsevier Ltd.


Wang L.,Nanchang Hangkong University | Liu X.,Dalian University of Technology
Information Sciences | Year: 2013

This paper is concerned with the problem of computing the bounds of disturbances for continuous-time Takagi-Sugeno fuzzy model. Two kinds of disturbances are investigated by applying the non-parallel distributed compensation (non-PDC) law, non-quadratic Lyapunov function and Lagrange multiplier method. One is bounded by magnitude, the other is bounded by energy. If the exogenous disturbances are bounded by magnitude, the maximal value of the magnitude under which the closed-loop system can be controlled is obtained by solving an optimization problem. On the other hand, if the disturbances are bounded by energy, except for the maximal bound, some conditions are derived to get two local regions (a smaller and a bigger) such that all the trajectories starting from the smaller region will remain in the bigger one which is required to be contained in a specific compact set (where the original system can be represented as T-S model exactly). In the end, the effectiveness of the proposed results is demonstrated by two examples. © 2013 Elsevier Inc. All rights reserved.


Fu Y.,Nanchang Hangkong University | Luo Q.,Nanchang Hangkong University
Optics Express | Year: 2011

Fringe projection profilometry is generally used to measure the 3D shape of an object. In oblique-angle projection, the grating fringe cycle is broadened on the reference surface. A well-fitted, convenient, and quick cycle correction method is proposed in this study. Based on the proposed method, an accurate four-step phase shift method is developed. Comparative experiments show that the fringe projection profilometry based on the novel phase shift method can eliminate cycle error and significantly improve measurement accuracy. The relative error of the measurement is less than 1.5%. This method can be widely employed for measuring large objects. © 2011 Optical Society of America.


Zhang L.,Nanchang Hangkong University
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2013

Pulsed magnetic field (PMF) processing has been employed for refining the microstructure of eutectic (Al-12.4Si) Al-Si alloy in the current study. The effect of PMF on microstructure and mechanical properties of eutectic Al-Si alloy was studied. The results show that the morphology of primary α-Al was refined from coarse columnar dendrites to fine equiaxed dendrites by PMF treatment. Fine short rod-like or rounded particle-like eutectic silicon was formed during solidification of eutectic Al-Si alloy treated by PMF. PMF treatment reduced the size of eutectic silicon from 49 to 2.3 μm in length, and the width from 3.1 to 0.6 μm. The aspect ratio of eutectic silicon was also reduced by PMF treatment from slightly less than 16 to slightly less than 4. The ultimate tensile strength and elongation of eutectic Al-Si alloy with PMF treatment at room temperature were about 201 MPa and 8.8 pct, respectively, which were increased by 47 and 73 pct, respectively, compared with the eutectic Al-Si alloy without PMF treatment. © 2012 The Minerals, Metals & Materials Society and ASM International.


In this paper a solution to the problem of finding the shape of piezoelectric modal sensors for a cantilever beam with intermediate support is proposed by using the differential transformation method (DTM). A general expression for designing the shape of a piezoelectric modal sensor is presented, in which the output signal of the designed sensor is proportional to the response of the target mode. Other modes are filtered out. The modal sensor shape is expressed as a linear function of the second spatial derivative of the structural mode shape function. By using boundary condition and continuity condition equations at intermediate support, the closed-form series solution of the second spatial derivative of the mode shapes can be determined based on DTM. Then the shapes of the designed modal sensors are obtained. Finally, numerical examples are given to demonstrate the feasibility of the proposed modal sensors for the cantilever beam with intermediate support. © 2011 Elsevier Ltd. All rights reserved.


Mao Q.,Nanchang Hangkong University
Journal of Sound and Vibration | Year: 2012

The Adomian modified decomposition method (AMDM) is employed in this paper to investigate the free vibrations of N elastically connected parallel EulerBernoulli beams, which are continuously joined by a Winkler-type elastic layer. The proposed AMDM method can be used to analyze the vibration of beam system consisting of an arbitrary number of beams. By using boundary conditions the natural frequencies and corresponding mode shapes can be easily obtained simultaneously. The numerical results for different boundary conditions, beam numbers and the stiffness of the Winkler-type elastic layer are presented. It is shown that the AMDM offers an accurate and effective method of free vibration analysis of multiple-connected beams with arbitrary boundary conditions. © 2012 Elsevier Ltd.

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