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Li Q.,Beihang University | Feng D.,Shanghai Aircraft Manufacturing Co. | Mei Z.,Chengdu Aircraft Design Institute
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2016

Aiming at the problems that frequent changes of aircraft configuration and relative weakness of management tools in aircraft using process, a simplified configuration management method for aircraft life cycle was presented. By taking batch type configuration and single configuration in manufacturing stage as managed objects, a combination of aircraft configuration tree with multi-view product information was used to conduct the aircraft configuration management and traceability during aircraft in service aiming at aircraft maintenance, engine parameter changes, modifications, technical changes, overhaul and others caused by maintenance and support services. Simultaneously, the product validation file for each configuration item in the aircraft configuration was established so as to conduct product data management and aircraft configuration version retroactive. The application results showed that the management played an important role in ensuring consistency of product data, improving aircraft management and reducing maintenance blindness in decision-making. © 2016, CIMS. All right reserved.

Tian Y.,Beihang University | Liu H.,Beihang University | Yin J.,Chengdu Aircraft Design Institute | Luo M.,Beihang University | And 2 more authors.
Chinese Journal of Aeronautics | Year: 2015

Simulation-based training is a promising way to train a carrier flight deck crew because of the complex and dangerous working environment. Quantitative evaluation of simulation-based training quality is vital to make simulation-based training practical for aircraft carrier marshalling. This paper develops a personal computer-based aircraft carrier marshalling simulation system and a cave automatic virtual environment (CAVE)-based immersive environment. In order to compare the training effectiveness of simulation-based training and paper-based training, a learning cubic model is proposed and a contrast experiment is carried out as well. The experimental data is analyzed based on a simplified Kirkpatrick's model. The results show that simulation-based training is better than paper-based training by 26.80% after three rounds of testing, which prove the effectiveness of simulation-based aircraft carrier marshalling training. © 2015 Production and hosting by Elsevier Ltd.

Zhan J.-X.,Beihang University | Zhan J.-X.,Chengdu Aircraft Design Institute | Wang J.-J.,Beihang University
Shiyan Liuti Lixue/Journal of Experiments in Fluid Mechanics | Year: 2010

Force measurement experiment was conducted in a low speed wind tunnel to investigate the effect of the flexibility of common swift's wing on the longitudinal aerodynamics of wing with large aspect ratio. The result shows that the change of spanwise camber due to wing's flexibility enhances lift and reduces drag, increases the maximum lift-to-drag ratio and delays stall. The wing flexibility could improve the longitudinal aerodynamics of large-aspect-ratio wing, which is significant to birds' flight and the design of micro air vehicle.

Sheng Y.,Nanjing University of Aeronautics and Astronautics | Xiong K.,Nanjing University of Aeronautics and Astronautics | Bian K.,Nanjing University of Aeronautics and Astronautics | Xiong X.,Chengdu Aircraft Design Institute | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2013

The numerical mode of carbon fiber T-joints was built by finite element analysis software, and its cohesive mode technique. The damage formation, extension and failing process of T-joints under tensile load were investigated. Then the static tension test was carried out on the carbon fiber T-joints. The test results demonstrate that the initial damage load was between 9.8 kN and 12.0 kN, and after the damage appeared, the bearing value on the T-joints descends sharply (approximately by 27%-38%). The ultimate damage load is between 8.0 kN and 8.6 kN, which is slightly lower than the initial one, because the filling area was destroyed. Both of the numerical and test results confirm that the filling area is the weakest part of the T-joints where the damage first appears. The crack then rapidly spreads to the glue film around the filling area. It was the peeling off of the glue film that accounts mostly for the failure of T-joints.

Zhang S.-L.,Nanjing University of Aeronautics and Astronautics | Shan Y.,Nanjing University of Aeronautics and Astronautics | Zhang Y.,Chengdu Aircraft Design Institute | Zhang J.-Z.,Nanjing University of Aeronautics and Astronautics
Tuijin Jishu/Journal of Propulsion Technology | Year: 2012

To get the structure of single expansion ramp nozzle (SERN) with good pneumatic performance and small infrared radiation, based on CFD/IR numerical calculations, the effects of slots area ratio, angle of slots and nozzle pressure ratio (NPR) on the aerodynamic and infrared radiation characteristics were revealed for the SERN. The results show that on the condition of low NPR, the slots form the "aerodynamic boundary" to improve the aerodynamic performances of the nozzle. On the condition of high NPR, the hot gas enters the slots to decrease the thrust coefficient. With the slots, the infrared radiation intensity of SERN is largely decreased. The infrared radiation intensity is decreased 90% at 0° on XOY plane. With increase of slots area ratio, the infrared radiation intensity is decreased. The angle of slots has little effect on infrared radiation intensity of SERN.

Zhang P.-H.,China Aerodynamics Research And Development Center | Wang M.,Chengdu Aircraft Design Institute | Deng Y.-Q.,China Aerodynamics Research And Development Center | Chen X.-L.,China Aerodynamics Research And Development Center
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2013

The method based on overset unstructured grid technique is developed for the simulation of cavity flows and store separation. The numerical simulation for typical cavity flows and separation trajectory of WPFS model have achieved good agreement with experimental data and shown a promising capability for applications. The numerical simulation of door operation and store separation trajectory has been made to investigate the unsteady effects on aerodynamic characteristics of the door flap. It is found that under certain conditions, the door's movement has a strong effect on aerodynamic characteristics of the door flap, which must be seriously considered during the door flap and control system design procedure. Under current conditions, all the store separation procedure is safe. The present research provides a technical support for door flap design and store separation evaluation.

Chen J.,Nanjing University of Aeronautics and Astronautics | Chen J.,Chengdu Aircraft Design Institute | Zhou J.,Nanjing University of Aeronautics and Astronautics
Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics | Year: 2014

Airborne antennas system is the major contributor of aircraft scattering, which plays an important role in the aircraft stealth. Focusing on the airborne antennas design and layout for the fourth generation fighter, the design of airborne antenna system with low scattering is studied and the principles and performance are discussed. The radar cross section (RCS) is reduced and the layout design is presented to maintain the system performance. ©, 2014, Nanjing University of Aeronautics an Astronautics. All right reserved.

Pan X.,Nanjing University of Aeronautics and Astronautics | Xiong K.,Nanjing University of Aeronautics and Astronautics | Bian K.,Nanjing University of Aeronautics and Astronautics | Lu J.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2015

This article studies the debond and crack propagation of carbon fiber reinforced plastic (CFRP) T-joints under tensile load. The numerical model for the T-joints provided the sensitive areas on which fiber Bragg grating (FBG) sensors could be fixed. FBG sensors along with a high speed camera were used to monitor the appearance and propagation of debond. The results show that the damage initiates at the T-joints filling area. The cracks propagate along two directions: the horizontal direction, i.e., the glue layers between the L prepreg and the skin and the vertical direction, i.e., the glue layers between two L prepregs. The propagation of cracks ultimately causes the structure failure. The changes of the FBG central wavelengths succeed in recording the appearance, accumulation and propagation of damage under non-visual conditions, which can help alarm the inner damage of the structure and indicate the crack propagation paths. ©, 2015, Beijing University of Aeronautics and Astronautics (BUAA). All right reserved.

Xia Z.,Northwestern Polytechnical University | Ma Y.,Northwestern Polytechnical University | Yun S.,Northwestern Polytechnical University | Xiong X.,Chengdu Aircraft Design Institute
Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University | Year: 2013

Constant amplitude tension-tension fatigue experiments were done on glass-fiber reinforced aluminium laminates. The fatigue crack growth and delamination growth were investigated on centre crack specimens. Crack growth rate almost kept constant with crack growing, and delamination length kept linear relation with crack length. Based on finite element method analysis method, the effective stress intensity factors were established at crack tip, and Paris-law was used to predict the crack growth rate. It is shown that the numerical results agree with experimental results; this agreement proves that this method can be used to predict fatigue crack growth rates in this hybrid laminate.

Cui H.,Northwestern Polytechnical University | Li Y.,Northwestern Polytechnical University | Liu Y.,Northwestern Polytechnical University | Guo J.,Chengdu Aircraft Design Institute | Xu Q.,Chengdu Aircraft Design Institute
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | Year: 2010

The cohesive zone model (CZM) was employed to simulate the delamination and random crack initiation in composite joints. A bilinear cohesive law incorporating mode I, II and mixed mode was presented, which was validated by the simulation of double cantilever beam (DCB) test. Cohesive elements were inserted into the space between every two solid elements to predict the random crack initiation in the filler at the root of the composite joint. The composite joint was simulated under pull-off load, and the numerical result is in good agreement with experimental one. In addition, a series of simulation was carried out under different conditions, i.e. different strength of matrix and adhesive, different radius and different filler property. The numerical result shows that the strengths of matrix, adhesive and filler have great influence on the loading capability and the failure modes of the composite joint. The performance of the structure increases with increasing the filler radius.

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