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Xie C.,Nanjing University of Aeronautics and Astronautics | Xie C.,Commercial Aircraft Corporation of China | Tong M.,Nanjing University of Aeronautics and Astronautics | Liu F.,Beijing Aeronautical Science and Technology Research Institute | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2013

Based on CDM theory, by coupling smoothed particle hydrodynamics (SPH) method and finite element method, the numerical calculation models of bird impact on 2024-T3 aluminum alloy, GLARE3 and GLARE5 plate with the same mass were established by using transient dynamic software PAM-CRASH. The strain, displacement and damage of three plates were obtained. According to the calculation results, the main conclusions were drawn: under high velocity impact loading condition, large-area damage on each composite layer of GLARE can be seen obviously and the damage is more severe near the back of plate. The displacement of the center on the plate is smaller while the material stiffness increases. The energy absorbing characteristics of GLARE is more excellent than aluminum alloy, and GLARE5 shows higher impact resistance than GLARE3. The research results can provide theoretical and technical support for GLARE application in the future wide body aircraft. Source

Yan Q.,Shanghai Aircraft Customer Service Co. | Xiong J.-J.,Beihang University | Qiu T.,Shenyang Aircraft Design Institute
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2011

The concept of safety factor with two-indexes of reliability and confidence levels was presented by introducing the confidence level index. Based on the reliability theory, new formulae of safety factor with two-indexes of reliability and confidence levels were derived to take the sample size of experimental data into account and to determine the safety factor value from small sample test data for structural reliability design. The new safety factor was applied to two sets of experimental results, demonstrating the practical and convenient use of the proposed technique. It is shown from these examples that the safe factor can be obtained realistically according to small sample test data using the new formulae. Source

Xu J.,Beihang University | Xu J.,Shanghai Aircraft Customer Service Co. | Bi C.-X.,Beihang University
19th International Conference on Industrial Engineering and Engineering Management: Assistive Technology of Industrial Engineering | Year: 2013

Customer service ability is one of the key competitiveness in market competition for civil aircraft manufacturers who participate. To establish the mature reliable civil aircraft customer service system based on the service strategy is an important aspect to reflect the customer service skills. Based on the idea of system dynamics, this paper constructed a system dynamics model (SD model) of the customer service system of COMAC, and through the simulation of the system, analyzed the key factors which affect the running of the customer service system, to provide the basis for decision-making and measures. © 2013 Springer-Verlag Berlin Heidelberg. Source

Liu Z.-H.,Nanjing University of Science and Technology | Liu Z.-H.,Shanghai Aircraft Customer Service Co. | Yin X.-C.,Nanjing University of Science and Technology
Gongcheng Lixue/Engineering Mechanics | Year: 2010

The impact problem of a simply supported beam with variable cross-section struck horizontally by a round-nosed rigid mass is investigated by considering the local deformation behavior of multiple elastic-plastic contacts induced by multiple impacts and multiple separations. A local elastic-plastic contact deformation model is applied and extended for multiple elastic-plastic impact problems. The finite difference method is used to solve dynamic equations. The numerical simulations show that such a horizontal strike is indeed a complicated process of multiple elastic-plastic impacts. There are usually more than two impact zones in which each of them consists of complicated multiple sub-impacts. It is found that the other impact zones might occupy a considerable impact impulse totally comparing to the first impact zone. Hence, the other impact zones have a significant influence on the dynamic response of the beam. It is found as well that the other impacts might make the mass loss considerable kinetic energy totally comparing to the first impact. It implies that the multiple impacts are of an important role upon the impact physical behavior of the beam. In addition, the numerical results show that the variations of the beam's cross-section will make the impact zones contract or stretch and make the second impact zone take place late or early. Source

Yang J.,Nanjing University of Science and Technology | Yin X.,Nanjing University of Science and Technology | Liu Z.,Shanghai Aircraft Customer Service Co. | Qian P.,Nanjing University of Science and Technology
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

By employing the overstress model, the effect of strain rate on local elastic viscoplastic contact deformation and free-free beam dynamics is considered. A local elastic viscoplastic uniaxial compression deformation model is presented to take into account the multiple impact-contact deformations. By the use of the finite difference method and the impact and separation conditions, the sub-impact phenomenon of a free-free beam horizontally stuck by a rigid mass is investigated. It is found that the horizontal impact is indeed a complicated process including elastic viscoplastic sub-impacts. The effect of strain rate of the beam has a significant role in local contact deformation and beam dynamics. It results in the obvious variations of impact force, elastic deformation and viscoplastic deformation of the beam. The present numerical simulations are compared with those solved by the three-dimensional dynamic finite element method. The comparisons illustrate that the present method is reasonable. ©2012 Journal of Mechanical Engineering. Source

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