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Han L.,Beihang University | Hong J.,Beihang University | Ma Y.,Beihang University | Dou M.,AVIC Harbin Dongan Engine group Corporation LTD
ICRMS'2011 - Safety First, Reliability Primary: Proceedings of 2011 9th International Conference on Reliability, Maintainability and Safety | Year: 2011

Missile-engine is an important part of missile system and a crucial factor to form military battle effectiveness. Considering of the long-term stored and one-time expended characteristics of missile-engine, it is significant to study storage reliability assessment of missile-engine and determine the weak moment. For digging the potential storage life of missile-engine, a missile-engine storage reliability assessment to study the variation of storage life is launched. According to the characteristics of missile-engine, the storage reliability and reliable storage life can be used as its storage reliability evaluation index. This paper concentrates on missile-engine storage reliable assessment based on Bayesian approach, and it is useful for the new maintenance program. © 2011 IEEE. Source

Wan X.,CAS Shenyang Institute of Metal Research | Shi Y.,AVIC Harbin Dongan Engine group Corporation LTD | Ma J.,CAS Shenyang Institute of Metal Research | Li H.,CAS Shenyang Institute of Metal Research | And 2 more authors.
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2010

CrN coatings were deposited onto 38CrA substrate using arc ion plating (AIP) method. The microstructures of CrN coatings were investigated by XRD and SEM. The corrosion behaviour affected by deposition parameters was studied by salt spray corrosion test in a neutral mist of NaCl solution at (35 ± 2)°C for 300 h. The results show that all of the CrN coatings contain primarily fcc-CrN along with hcp-Cr2N and bcc-Cr phases. CrN phase in coating deposited under lower N2 pressure exhibited {100} preferred orientation, while {110} preferred orientation under higher N2 pressure. Under the deposition condition of higher bias voltage and lower N2 pressure, the CrN coating achieves dense microstructure with less residual stress and porosity, which leads to better corrosion resistance in salt spray test. The corrosion product of salt spray test was investigated by SEM and EDS, and the corrosion mechanism was discussed. © Copyright. Source

Dong G.,Harbin Institute of Technology | Dong G.,AVIC Harbin Dongan Engine group Corporation LTD | Zhou M.,Harbin Institute of Technology | Huang S.,Jiamusi University
Key Engineering Materials | Year: 2014

The conventional machining method for silicon nitride ceramics has low machining efficiency, prone to cracking, chipping and other defects. In this paper, the author carried out a study on the influence of ultrasonic vibration grinding on surface quality of silicon nitride ceramic, and carried out ultrasonic vibration grinding process test for silicon nitride ceramic and conducted the analysis of influence of this machining process on surface quality with orthogonal test. The test results showed that the influence on surface roughness decreased in the order of spindle speed, feed rate, cutting depth, and amplitude of vibration. Source

Xiu J.-Q.,AVIC Harbin Dongan Engine group Corporation LTD | You Q.,Nanjing University of Aeronautics and Astronautics | Shi Z.-Y.,Nanjing University of Aeronautics and Astronautics
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

The vehicle loads to be identified as moving loads were mapped into a wavelet space, a continuous bridge under action of moving load was modeled with the wavelet finite element method (WFEM). Taking the scale function of wavelet as an interpolation function, an elemental transformation matrix was formed to realize the transfer from the wavelet space to a physical one. The moving load was identified with distributed acceleration data as measured dynamic responses, they were integrated into velocities and displacements. The large fluctuation could be avoided in analysis of time history with the dynamic programming method and regularization. The simulation validated the feasibility of the proposed moving load identification on a continuous bridge model using WFEM with fewer elements, furthermore the noise could be greatly smoothed with the first order Tikhonov regularization in identification. Source

Wang Y.-Z.,Beihang University | Wang Y.-Z.,Chongqing University | Wu C.-H.,Beihang University | Gong K.,Beihang University | And 3 more authors.
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science | Year: 2012

In order to analyze the transmission performance of face-gear in real working condition, a calculational approach for load equivalent error of alignment has been investigated with the purpose of analyzing the support system and tooth deformation of face-gear drives. Then, the equations of contact path of loaded tooth contact analysis have been established based on load equivalent error of alignment. For the purpose of analyzing the bearing contact, the curvatures of face-gear and pinion have been presented. Tooth contact deformation and bending deformation have been developed using elasticity and three-dimensional FEA. Loaded tooth contact analysis and contact stress have been considered to simulate the contact and meshing of the gear tooth surfaces and to calculate the evolution of load distribution, bearing contact, transmission errors, and contact stresses of the gear drive along the cycle of meshing. The performed research proves that the proposed loaded tooth contact analysis method can effectively solve the meshing characteristic problem of face-gear drives system. The results are illustrated with numerical examples. © IMechE 2012. Source

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