Zhenjiang, China
Zhenjiang, China

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Yuan J.-G.,Chongqing University of Posts and Telecommunications | Wang W.,Chongqing University of Posts and Telecommunications | Tang B.,Jiangsu Jiaotong College | Liang T.-Y.,Chongqing University of Posts and Telecommunications | Wang Y.,Chongqing University of Posts and Telecommunications
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2012

A novel construction method with the advantages of simple construction and easy implementation encoding for quasi-cyclic low-density parity-check(QC-LDPC) codes based on Galois field (GF(q)) multiplicative group is proposed. This algorithm can flexibly adjust code length and code rate Furthermore, the complexity of the encoding and decoding is low. An irregular QC-LDPC(3843, 3603) code suitable for optical communication systems is constructed by applying the proposed construction method. The simulation results show that the error-correction performance of the QC-LDPC(3843, 3603) code is better than that of the classic RS(255, 239) code, the LDPC code constructed by the SCG construction method, and the regular QC-LDPC(4221, 3956) code. So the QC-LDPC(3843, 3603) code is suitable for the high-speed long-haul optical communication systems.

Shan H.,Guizhou Transportation Planning Survey and Design Academe Co. | Jing G.,Chang'an University | Ye Q.,Jiangsu JiaoTong College | Duan Y.,Chang'an University
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2013

The paper mainly researches the influence of different mineral admixtures to liquidity, water performance and strength of dry mortar. The test results show that, adding mineral admixtures improved mortar working performance and mechanical properties, mortar work performance is the best when 10% of fly ash and 20% of the mineral powder with complex, compressive strength and flexural strength is the highest, 28d cement strength can be increased by 75% and 25% respectively.

Zhang D.,Jiangsu University | Gu C.,Jiangsu University | Yuan J.,Jiangsu Jiaotong College | Shen Z.,Jiangsu University | And 2 more authors.
Key Engineering Materials | Year: 2014

Laser shock micro-adjustment is a precise and noncontact adjustment technique using laser-shock-waves to adjust the curvature of micro-components. The experimental studies have indicated that: when laser shock region is located at the free end of cantilevers, multiple impacts are applied to achieve a large bending degree; meanwhile, different bending directions can be obtained with multiple impacts in the junction position. Efforts should been made to understand the mechanisms of multiple laser shock micro-adjustment. Two mechanisms have been proposed for describing the laser shock micro-adjustment in different laser shock regions, namely shock inertia mechanism and material flow mechanism. The proposed micro-adjustment mechanisms can predict bending angles and directions. To validate the proposed micro-adjustment mechanisms, numerical simulations were carried out based on the FEM method using the ANSYS/LS-DYNA software and the corresponding results demonstrate the proposed mechanisms. © (2014) Trans Tech Publications, Switzerland.

Wang M.,Jiangsu University | Li T.,Jiangsu University | Li X.,Jiangsu Jiaotong College | Liu C.,Jiangsu University | Liu H.,Jiangsu University
Key Engineering Materials | Year: 2014

White body in the design process needs to meet the needs of a wide range of performance requirement. Adequate stiffness and modal are the basis to ensure the vehicle's performance of vibration noise. Simultaneously, in order to reduce energy consumption and cost, the lightweight design of the white body has become the mainstream. In this paper, the optimization design is conducted for stiffness and modal of a commercial vehicle's white body based on the theory of the finite element size sensitivity optimization design. Firstly, build the finite element model of a vehicle's white body and analyze its stiffness and modal. Some changes were made to the car-body's partial structure according to the distributing of strain energy achieved from above analysis, which improved the car-body's dynamic and static performance initially. Secondly, choose panels needed to be optimized by reference to the density of strain energy and panels' mass. Then, the car-body's structure was optimized using panels' thickness as design variables, stiffness and modal frequencies as constrains and minimizing weight of white car-body as objective. After the analysis of the result, modal separation was put forward to improve the quality of this finite element optimization design model. Finally, the car-body's stiffness and mode nature entirely satisfied the requirements with car-body's weight decreased. © (2014) Trans Tech Publications, Switzerland.

Zhu Y.-D.,Jiangsu University | Zhu Y.-D.,Jiangsu Jiaotong College | Mei D.-Q.,Jiangsu University | Wu H.,Jiangsu University | Zhang Y.-T.,Jiangsu University
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2014

In order to synergistically boost applications of ethanol and biodiesel from biomass, the economy, power and emissions of the ethanol-diesel-biodiesel blends in different proportions were investigated to provide theoretical and experimental basis for the promotion and application of mixed oxygenated fuels. The results show that cylinder pressures of three fuel blends are slightly lower than that of neat diesel. The corresponding crank angle of peak pressure in cylinder of EBD1 (80% diesel+20% biodiesel) is about 1°CA in advance. The addition of ethanol makes the pressure peak of EBD2 (70% diesel+20% biodiesel+10% ethanol) and EBD3 (55% diesel+20% biodiesel+25% ethanol) slightly delayed. The heat release peaks of three fuel blends are lower than that of neat diesel with the increase of biodiesel and ethanol in fuel blends, the heat release heats all decline in different degrees. With the increase of oxygen content in fuel blends, both HC and CO emissions decline in different degrees, and smoke emissions also decrease apparently, while NOx emission increase slightly.

Hu D.,Chang'an University | Ding D.,Chang'an University | Ding D.,China Communications Construction Company Ltd. | Chen L.,Chang'an University | And 2 more authors.
Applied Mechanics and Materials | Year: 2011

This paper presents simulation analysis of load effects of bridges under random fleet. Based on actual data of vehicle loads on Guangzhou-Shenzhen Expressway and relevant statistical results, mid-span bending moments of long-span virtual simple-supported beams are calculated. Then probability distribution of the bending moments and extreme value distribution of the load effects within design reference period are obtained. Finally, characteristic values of mid-span bending moments and recommended values of design lane load are calculated, sequentially. The results studied in this paper can be as a reference for long-span bridge design, and also can be a reference for overloading control or weight charge policy. © (2011) Trans Tech Publications.

Ma Y.,Jiangsu University | Wang X.,Jiangsu University | Xu P.,Jiangsu Jiaotong College | Zhang Q.,Jiangsu University | And 2 more authors.
Key Engineering Materials | Year: 2014

Laser-driven flyer micro forming process is a promising microforming technology with the advantage of high efficiency, low cost, high flexibility. A series of experiments are conducted to investigate forming ability of aluminum foil with the thickness of 50?m. The effect of forming temperature and laser energy on forming ability characterized by forming depth, forming accuracy and surface quality is quantitatively analyzed. It is found that forming depth observed through three dimensional topography increases with the enhancement of forming temperature and laser energy. By elevating the forming temperature, the preheated workpiece suffers more homogenous deformation, presenting better forming accuracy. However, a certain degree of deterioration of surface integrity at the forming temperature of 200? can be attributed to the earlier appearance of micro cracks caused by excessive thinning even at low laser energy. Overall, it is concluded that the optimal forming temperature is appropriately 150? as the forming depth and forming accuracy is improved with no deterioration of the surface integrity. © (2014) Trans Tech Publications, Switzerland.

Gu Y.,Jiangsu University | Wang X.,Jiangsu University | Hao E.,Jiangsu Jiaotong College | Zheng Y.,Jiangsu University | And 3 more authors.
Key Engineering Materials | Year: 2014

Laser impact welding (LIW) is a novel welding technique which uses laser induced shock waves to obtain the solid-state and metallurgical bonding between flyer and base plates, and can be applied in welding of dissimilar metal plates in micron level. In this paper, experimental study is conducted with titanium as the flyer plate and aluminum as the base plate under different laser energies and laser spot diameters. Besides, the microstructure and mechanical properties of the welding joints are also investigated. The wavy interface is observed by metallographic investigation which is similar to explosive welding and electromagnetic pulse welding. Moreover, the micro-hardness taken from the interface region shows an obvious improvement compared with the base metal. It is also found that laser shock welding results in fine grained structure of titanium on the weld interface. In conclusion, laser shock welding can not only improve the material microstructure of weld interface, but also avoid the heat affected zone and formation of intermetallic phase during dissimilar metal welding. Therefore, it is a promising welding technology in the field of MEMS. © (2014) Trans Tech Publications, Switzerland.

Yang Q.Y.,Anhui University | Zhang J.Z.,Anhui University | Ma Y.P.,Anhui University | Wu Y.B.,Anhui University | Zhang W.N.,Jiangsu Jiaotong College
Advanced Materials Research | Year: 2014

In order to improve vehicles comfort, electronically controlled air suspension is taken as study object. We designed the PID controller, which can regulates stiffness and height of air spring. Taking stiffness of air suspension as control variables, and the acceleration of the sprungmass as target values, one-quarter vehicle model of air suspension for bench test is established, then PID control system was tested on the bench. The bench test results show that the PID control algorithm can improve vehicle ride performance. © (2014) Trans Tech Publications, Switzerland.

Hu D.,Chang'an University | Chen L.,Chang'an University | Ding D.,Chang'an University | Ding D.,China Communications Construction Company Ltd. | And 2 more authors.
Applied Mechanics and Materials | Year: 2011

This paper presents statistical analysis of vehicle loads, which were measured by Weighing in Motion (WIM). The vehicle composition, distribution of gross vehicle weight (GVW) and load distribution of classified vehicles are obtained; Axle load proportions and wheelbases of different type of vehicles are also statistically analyzed. Based on statistic theory of extreme value distribution, characteristic values of different type of vehicle loads within design reference period are deduced. The analysis results can be used for safety evaluation of road pavements, bridges and culverts in the expressway, and can be as a reference for both design load formulation and overloading control of bridges. © (2011) Trans Tech Publications.

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