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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 | Year: 2016

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.


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 | Year: 2013

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.


Chen D.Y.,Nanjing University of Science and Technology | Wang L.M.,Nanjing University of Science and Technology | Wang C.Z.,University of Pittsburgh | Yuan L.K.,Nanjing Iveco Automobile Co. | And 2 more authors.
International Journal of Automotive Technology | Year: 2015

Occupant protection of vehicle cab is required for all the commercial vehicles. According to ECE R29-03 amendments, the simulation methods of the front pillar impact test and the side 20° pendulum impact of the roof strength test for a light truck with a gross mass not exceeding 7.5t are proposed. In this study, a reliable finite element model of a light truck is built by using its CAD model. The finite element model is verified against cab modal test and frontal impact test. Then two crash tests are simulated to evaluate the survival space by examining the contact between the deformed cab and a prescribed manikin model. In the front pillar impact test, the deformed cab is predicted to contact with the manikin. In the roof strength test, the minimum distance between the deformed cab and the manikin is predicted to be 75.3 mm, which does not satisfy requirements either. To enhance the crashworthiness of the truck, some structural improvements are designed such as filling structural foam in the A-pillars and the side panels, adding a roof crossbeam, and reinforcing the rear wall of cab. The simulation results of the improved cab structure show that the cab stiffness is improved, the energy absorption is more homogeneous and there is no penetration into the survival space. © 2015, The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg.


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 | Year: 2016

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.


Wang L.,Nanjing University of Science and Technology | Hong C.,Nanjing University of Science and Technology | Chen R.,Nanjing IVECO Automobile Co. | Yin Z.,Nanjing IVECO Automobile Co. | Yang X.,Nanjing IVECO Automobile Co.
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2013

In order to accurately analyze the dynamic characteristics of a certain off-road vehicle, this paper does a rigid-flexible coupling integral model and dynamic simulation based on the finite element method and multi-body dynamics theory. Considering their deformations, the control arms and frame are flexibly processed using the finite element software HyperWorks, and a rigid-flexible coupling whole vehicle model is built in ADAMS/Car. According to the national standard GB/T 6323-94, the snaking test and steady static circular test are carried out for a rigid-flexible coupling vehicle model. The model is compared with the simulation results of a rigid one. The results show that the deformations of flexible components affect the simulation results of the entire vehicle's handling stability, and this vehicle has good handling stability.


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 | Year: 2015

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.


Wang L.-M.,Nanjing University of Science and Technology | Chen D.-Y.,Nanjing University of Science and Technology | Yuan L.-K.,Nanjing Iveco Automobile Co. | Zhang Z.-Z.,Nanjing Iveco Automobile Co. | Zhang T.-Y.,Nanjing Iveco Automobile Co.
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2012

To improve the roof safety of a certain school bus, the occupant protection performances of a certain school bus roof structure in rollover accidents are studied here. A durability finite element model of the bus is built by using Hypermesh and Hypercrash. As automotive collision contains the characteristics of geometric nonlinearity, material nonlinearity and boundary nonlinearity, the appropriate nonlinear materials and shell elements are selected and defined, and the spots and other connections are simulated. The rollover protection and roof crush resistance simulation are carried out by RADIOSS. The results show that the body structure is able to withstand 1.5 times of the gross vehicle weight of the standard in roll-over protection simulation, and the intrusion distance is 46 mm in roof crush resistance simulation. Both simulation results meet the requirements of standards. Referring to related international advanced standards, the design of A-pillar and crossbeam is improved, the maximum bearing capacity of one single beam reaches 64700 N, and the roll-over protection performances of the school bus are improved.


Wang L.,Nanjing University of Science and Technology | Wang W.,Nanjing University of Science and Technology | Zhang Y.,Nanjing Iveco Automobile Co. | Chen R.,Nanjing Iveco Automobile Co. | And 2 more authors.
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2015

Aiming at the rupture of powertrain housing for an off-road vehicle because of the complex road conditions, changing loads and so on, the vibration mode of the powertrain is researched using the finite element modal analysis and modal experiments. The first order modal natural frequency and second order modal natural frequency of the powertrain are low and easy to form a resonance, the strain energy density of the housing is high and the amplitude at the connection of the transfer case housing is large, which cause the rupture of the powertrain housing. Ribs are added in the high strain energy density area of the transmission housing to improve the stiffness, connecting points are increased and ribs are added in the surrounding to reduce the amplitude. Simulation results show that the natural frequency of the optimized powertrain is improved, the strain energy density is reduced, the resonance frequency under the common engine speed is avoided, so that the rupture of the powertrain housing is prevented. ©, 2015, Nanjing University of Science and Technology. All right reserved.


Wang L.,Nanjing University of Science and Technology | Chen D.,Nanjing University of Science and Technology | Zou X.,Nanjing Iveco Automobile Co. | Zhang T.,Nanjing Iveco Automobile Co. | Zhang Z.,Nanjing Iveco Automobile Co.
Jiangsu Daxue Xuebao (Ziran Kexue Ban)/Journal of Jiangsu University (Natural Science Edition) | Year: 2014

To improve the crashworthiness of light truck, the finite element model of a light truck was established. Cab modal analysis and vehicle 100% frontal collision simulations were carried out. The test and simulation results were compared to verify the finite element model. According to ECE R29-03 standard, the simulation methods of A-pillar impact test were proposed for a light truck with gross mass less than 7 500 kg. According to the simulation results, the cab was crushed, and the A-pillar and the rear wall were severely deformed. The non-resilient parts were contacted with manikin, and the living space could not satisfy the requirements. To enhance the collision performance, some improvement mea-sures with filling structural foam in A-pillar and adding rear wall reinforcing plate and beam were applied. The simulation results show that the cab stiffness is promoted with optimized transfer path of force, and the energy absorption becomes more homogeneous without penetration into survival space.


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 | Year: 2014

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.

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