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.
Hu D.,Changan University |
Ding D.,Changan University |
Ding D.,China Communications Construction Company Ltd. |
Chen L.,Changan 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.
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.
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.
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.