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Fang D.G.,Nanjing Iveco Motor Company Ltd | Wei G.X.,Nanjing Iveco Motor Company Ltd | Shi W.K.,Jilin University | Wang C.X.,Jilin University
Applied Mechanics and Materials | Year: 2014

In order to meet the ride comfort requirements of the light bus under no load and full-load condition,its rear suspension employs two-level variable stiffness leaf spring. For reasonably matching the two values of the variable stiffness and the damping force curve of the damper, one kind of virtual prototype technology was used. The virtual spring model of two-level variable stiffness was created in Adams-Chassis and the center-curve of the leaves was based at the free-state of the leaf spring. Then the front suspension, the rear suspension, the steering system, the powertrain & drineline system, the braking system, the wheels and bus body were respectively builded in Adams_Car, and they consituted the virtual assembly model of the light bus. So we could use the virtual model to conveniently test the performance of the ride comfort and handling stability under the no load and full-load state. Based on the ISO test standards, the virtual objective evaluation indexes were all calculated. According to these indexes, the two-level variable stiffness and the damping force curve were optimized. At last, the optimization results were verified by testing the optimized light bus. Experimental results shows that virtual optimization technology could play an important role in solving engineering problems. © (2014) Trans Tech Publications, Switzerland.


Li L.,Jiangsu University | Li L.,Henan Institute of Engineering | Wang Z.,Jiangsu University | Qin X.,Jiangsu University | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

The 1000 h reliability experiment was carried out on the common rail diesel engine using BD5 biodiesel. The wears of engine parts were investigated after experiment. By dismantling and examining the engine parts, processing traces or visible light of major friction journal could be observed, and there was a small amount of coke at the valve. The wears of the main moving parts were measured after the reliability experiment. The wears of piston, connecting rod, crank group and valve train were analyzed. The results showed that, the diesel engine could burn biodiesel for long time without problem, after 1000 h test, the wear of oil ring for cylinder 4 was 0.004 mm, the wear of small rod for cylinder 3 was 0.043 mm, the wear of crankshaft for cylinder 2 was 0.003 mm. The maximum subsidence of valve for cylinder 1 and cylinder 2 was 0.009 mm. During the experiment, the parts of diesel engine were not broken, peeled off, ablation or bonded. Burning biodiesel had no exceptionally influence to the diesel major parts.


Shi W.,Jilin University | Yao J.,Jilin University | Hou S.,Jilin University | Guo F.,Nanjing Iveco Motor Company Ltd | Fang D.,Nanjing Iveco Motor Company Ltd
Applied Mechanics and Materials | Year: 2012

The transient flow field is needed in order to predict the aerodynamic noise of an automotive HVAC duck by conventional methods. However, it is time-consuming when are several improved schemes. To solve the problem, schemes with large sound power can be discarded using Broadband Noise Source (BNS) model at first. Then, the best scheme can be found after the transient flow simulation. In this paper, an automotive HVAC duck is used as an example. Firstly BNS is used to predict which scheme is noisier, secondly the aerodynamic noise is computed using Fluent coupled with Sysnoise. At last they come to the same conclusion. The simulation results indicate BNS model can be used to find which scheme is the best without computing the transient flow field. So it can shorten the cycle of developing new products. © (2012) Trans Tech Publications.


Fu J.-H.,Jilin University | Shi W.-K.,Jilin University | Shen Z.-H.,Nanjing Iveco Motor Company Ltd | Guo F.-X.,Nanjing Iveco Motor Company Ltd | Fang D.-G.,Nanjing Iveco Motor Company Ltd
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

There are only many local optimal solutions to a mounting system of automotive powertrain with traditional optimal algorithms. Therefore, genetic algorithm was adopted to overcome this fault and the corresponding program was compiled with MATLAB software. Taking six-degree-freedom decoupling of an automotive powertrain mounting system as an objective function, stiffness of each mounting was served as the design variable, the appropriate arrangement for natural frequencies of the system and the displacement control for the powertrain under each operating condition were taken into account. ADAMS software was used to verify natural frequencies and kinetic energy distribution of the powertrain mounting system before and after optimization, and the static equilibrium of the powertrain mounting system was checked. The results showed that the global optimal solution to the mounting system with the genetic algorithm is obtained reliably and the decoupling effect of the powertrain mounting system after optimization becomes better.


Chen Z.-Y.,Jilin University | Shi W.-K.,Jilin University | Shen Z.-H.,Nanjing Iveco Motor Company Ltd | Guo F.-X.,Nanjing Iveco Motor Company Ltd | Fang D.-G.,Nanjing Iveco Motor Company Ltd
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2010

Here, the finite element model of body and frame of a light-type bus was established. The vibration modes of the body and the frame as well as the frame alone were computed. The computed results were compared with those of tests. It showed that the proposed model can reveal the vibration characteristics of the original structure. The finite element model for the cavity acoustics was established. The first mode in the longitudinal direction of the cavity acoustics was analyzed. All of the modes including the body, the frame and the cavity acoustics were analyzed and compared.

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