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Jiang Q.,Nanjing University of Aeronautics and Astronautics | Miao Q.,Nanjing University of Aeronautics and Astronautics | Ding X.,Nanjing IVECO Automobile Co. | Wei X.,Jiangsu Linlong New Materials Co.
Journal of the Chinese Society of Corrosion and Protection

The behavior of hydrogen evolution was determined by gas volumetric measurement over a period of 72 h at 45 °C. The inhibiting effectiveness of ten kinds of corrosion inhibitors on Al-Zn-Si alloy powders in a solution of water with 10 mass% C6Hi402 was compared. The investigations of Al-Zn-Si samples were carried out by use of IR, SEM and XRD. It has been shown that the hydrogen evolution of flake Al-Zn-Si powder can be inhibited by the addition of TBAB and HEDP with an optimal concentration of TBAB/Al-Zn-Si=50(mass%) and HEDP/ Al-Zn-Si=100(mass%) in 2-butoxyothanol aqueous solutions the inhibition efficiency can reach 78.99% and 62.77%, respectively. At last, Pourbaix diagram was used to analyse the microgalvanic corrosion of Al-Zn-Si alloy powder in aqueous media, and the inhibition mechanism of the inhibitors TBAB was discussed briefly. Source

Nie X.-A.,CAF Institute of Chemical Industry of Forest Products | Yuan W.-J.,Nanjing IVECO Automobile Co. | Wang Y.-G.,CAF Institute of Chemical Industry of Forest Products
Xiandai Huagong/Modern Chemical Industry

A kind of conducting coating with excellent electric conductivity is prepared with fatty acid dimmers as matrix resin and silver coated copper powder and silver powder as conducting fillers. The electrical conductivity, mechanical properties and impact resistance properties are studied. By adding 60% mass fraction of conducting fillers, the cured films with good adhesion to substrates and impact strength no less than 50 kg·cm have 6.55×10-4/Ω·cm of volume resistivity, 340.7°C of heat decomposed temperature and 105.6°C of the glass transition temperature. The pot life of the conductive coating is 8 hours. Source

Ke J.,Jilin University | Shi W.,Jilin University | Chen Z.,Jilin University | Gao B.,Jilin University | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica

In order to matching design the stiffness of composite auxiliary spring, the structure of the main-auxiliary spring assembly structure, which includes a composite auxiliary spring, was designed. The equivalent load of the composite auxiliary spring was calculated by the concentrated load method. According to the change of the deflection of the original steel leaf spring, the equivalent stiffness of the composite auxiliary spring was estimated. The equivalent stiffness of the composite auxiliary spring was matching designed according to the design theory of steel leaf spring. The finite element simulation for the total stiffness of the main-auxiliary spring assembly was made by ABAQUS software. By adjusting the ply number of the composite auxiliary spring, the equivalent stiffness of the composite auxiliary spring was modified. The proposed matching design method processes great importance for the popularization and application of composite leaf spring. © 2016, BUAA Culture Media Group Ltd. All right reserved. Source

Gao Q.,Nanjing University of Science and Technology | Wang L.,Nanjing University of Science and Technology | Wang Y.,Nanjing University of Science and Technology | Guo F.,Nanjing IVECO Automobile Co. | Zhang Z.,Nanjing IVECO Automobile Co.
Advances in Engineering Software

In this paper, a novel foam-filled double ellipse tube (F-DET) is proposed. First, the circle and ellipse tubes with three different configurations(hollow, foam-filled, double foam-filled) are investigated under axial and oblique impact by using the nonlinear finite element code LS-DYNA. The numerical results showed that the F-DET tube has the best crashworthiness performance than tubes with other configurations. Then to optimize the F-DET tube, the Kriging model about the radial rate f, thickness of wall t and foam density ρf is constructed. Based on the Kriging model, the multiobjective particle swarm optimization (MOPSO) algorithm is utilized to achieve the optimized F-DET tube, foam-filled ellipse(F-ET) tube and foam-filled double circle(F-DCT) tube on the maximizing specific energy absorption (SEA) and minimizing peak crush force (PCF) under multiple loading angles. It can be found that the F-DET tube has better crashworthiness performance than F-ET tube and F-DCT tube. This indicates F-DET tube can be a potential energy absorber under the multiple loading cases. © 2016 Elsevier Ltd. All rights reserved. Source

Zhuang W.-C.,Nanjing University of Science and Technology | Wang L.-M.,Nanjing University of Science and Technology | Yin Z.-P.,Nanjing IVECO Automobile Co. | Ye J.,Nanjing IVECO Automobile Co. | Wu H.-X.,Nanjing IVECO Automobile Co.
Zhendong yu Chongji/Journal of Vibration and Shock

A method to optimize a powertrain mounting system was developed to improve the vibration isolation performance of the mounting system for a parallel hybrid electric vehicle. The optimization was based on the genetic algorithm by taking 6-DOF energy decoupling of the powertrain mounting system and the reasonable allocation of the natural frequencies as the objectives, and taking the stiffnesses of 5 mounting points as the design variables. This method was applied to deal with the shaking of steering wheel for a parallel hybrid electric vehicle in its idling process. The results of dynamic simulation verified the effectiveness of the method. Furthermore, it was shown that compared to the sequential quadratic programming (SQP), the genetic algorithm overcomes its shortcoming of converging to local optimal solution, the decoupling features of the mounting system obtained from the optimization are better and reliable. ©, 2015, Chinese Vibration Engineering Society. All right reserved. Source

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