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Xie X.,CAS Shenzhen Institutes of Advanced Technology | Xie X.,Huazhong University of Science and Technology | Ma C.,CAS Shenzhen Institutes of Advanced Technology | Sun Q.,CAS Shenzhen Institutes of Advanced Technology | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

Non-rigid image registration plays an important role in medical imaging. One disadvantage of classic Demons algorithm is that the topological preservation can not be ensured, and it can only deal with the single modality image registration. The mutual information algorithm has been validated useful for multi-modality image registration. By analyzing the critical points of Demons registration like mis-registration, an improved algorithm with mutual information evaluation is proposed. Experiment results show that the proposed algorithm can deal with multi-modality image registration well and it can hold the abilities even faces the noise and distortion. © (2013) Trans Tech Publications, Switzerland. Source


Hou C.,Harbin Institute of Technology | Zhang P.,Chinese University of Hong Kong | Zhang P.,Shenzhen Key Laboratory of Precision Engineering | Hu Y.,Chinese University of Hong Kong | Zhang J.,University of Hamburg
2012 IEEE International Conference on Robotics and Biomimetics, ROBIO 2012 - Conference Digest | Year: 2012

In this paper, a 5-DOF serial-parallel manipulator with RP-(2-RRU/1-RUU) structure is proposed. This manipulator is used to the automatic production line, to complete the materials' loading, delivery and unloading. In order to ensure the safety and high efficiency production, the manipulator has good stiffness and high accuracy, and is suitable for the fast operation. Based on the above requirements, the manipulator has the big work space characteristic of the serial mechanism and the high precision and stiffness characteristic of the parallel mechanism. However, the difficulty of its dynamics analysis is increasing. In this paper, the modal analysis and the harmonic response analysis are carried out using finite element analysis software, and the dynamic characteristics of the manipulator are derived. The inverse dynamics modeling has been performed based on the Newton-Euler method. The dynamics simulation is carried out to check the correctness of dynamics modeling. This study is also significant to the trajectory planning and control system. © 2012 IEEE. Source


Dang X.B.,CAS Shenzhen Institutes of Advanced Technology | Dang X.B.,Shenzhen Key Laboratory of Precision Engineering | He K.,CAS Shenzhen Institutes of Advanced Technology | He K.,Shenzhen Key Laboratory of Precision Engineering | And 4 more authors.
Applied Mechanics and Materials | Year: 2014

The mechanical performances are studied for the aluminum cellular metal through finite element analysis (FEA) method in the paper. Cellular metal is a kind of complex structure with good performances using in many fields. The paper analyzes three different kinds of regular cellular metal structures, including two Kelvin structures and one cubic structure. The models of the three structures are established in CAD system. The mechanical performances under different directional forces - namely normal, 45-degree and shear forces - are simulated through FEA. Both the elastic and plastic performances are taken into consideration. The result shows that the stiffness of the cubic cellular structure is the strongest among the three structures. All the three structures could hold more normal force than the other two directions. The yield stress of the cubic structure is bigger than that of the staggered Kelvin structure. © (2014) Trans Tech Publications, Switzerland. Source


Wei S.,CAS Shenzhen Institutes of Advanced Technology | Wei S.,Shenzhen Key Laboratory of Precision Engineering | Wei S.,Tongling University | Xu L.,Yantai Vocational College | And 6 more authors.
International Journal of Advanced Manufacturing Technology | Year: 2015

Metal bellows have been widely used as expansion joints to absorb expansions and contractions in many engineering applications from the start of the century. In conventional metal bellows forming process, the main disadvantages are high cost of tooling required and lack of flexibility. To avoid the disadvantages, this paper presents a new metal bellows forming process using water jet incremental forming technology. The effect of some parameters in forming bellows is described in the paper. Meanwhile, because uniformity of thickness of metal bellows has great influence on its working life, the experimental research of the thickness distribution was carried out in the study. The feasibility of the process was validated by experiments. © 2015 Springer-Verlag London Source


Mao H.,CAS Shenzhen Institutes of Advanced Technology | Mao H.,Shenzhen Key Laboratory of Precision Engineering | He K.,CAS Shenzhen Institutes of Advanced Technology | He K.,Shenzhen Key Laboratory of Precision Engineering | And 3 more authors.
Advanced Materials Research | Year: 2013

Reduction tube using a die is a kind of deformation tubes which are used on railway train as energy absorbers. In this paper, axial compression behavior and energy absorption characteristics of reduction tubes using a die under impact load are investigated. No-linear finite element software LS-DYNA is used to conduct the numerical study. Results for the expansion tube using a die (another kind of deformation tube) and the reduction tube using a die are compared. Assuming two different structures with the same material and sectional area, an analysis shows that the energy absorption of reduction tube is better than the expansion tube. Hence, the reduction tubes using a die are investigated using a series of numerical analysis. The relationship between displacement and load, average load are obtained. The influences of impact mass and impact velocity are discussed. © (2013) Trans Tech Publications, Switzerland. Source

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