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Guo T.,China Aviation Powerplant Research Institute | Guo T.,Aviation Key Laboratory of Aerospace engine Vibration Technology | Mei Q.,China Aviation Powerplant Research Institute | Mei Q.,Aviation Key Laboratory of Aerospace engine Vibration Technology | And 6 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2016

A novel vacuum casting techniquewas developed tofabricate photoelastic models. The original work was that the casting and curing were performed under the conditions of low vacuum and well-controlled constant temperatures. The impact of the vacuum casting conditions, including but not limited to the ratio of epoxy-resin128 and cis-butenedioic anhydride, casting and curing temperature and pressure, on the microstructures and initial stress was investigated. The tongue-and-groove photoelastic models of an aircraft engine were fabricated by vacuum casting under the optimized casting and curing conditions. The preliminary results show that the newly-developed vacuum casting technique outperform the conventional one because of the many advantages, such as the lower cost, smaller volume shrinkage, weaker initial stress, fewer bubbles, less contamination, better uniformity and more environmental friendly. In addition, no "cloud" and no surface pit were observed in the vacuum casted photoeleatic models. © 2016, Science Press. All right reserved.


Guo T.,China Aviation Powerplant Research Institute | Guo T.,Aviation Key Laboratory of Aerospace engine Vibration Technology | Mei Q.,China Aviation Powerplant Research Institute | Mei Q.,Aviation Key Laboratory of Aerospace engine Vibration Technology | And 2 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2016

A novel technique has been successfully developed to fabricate the photo-elastic models for key parts of aero-engine based on vacuum technology with lab-built setup.The original work included: the laser rapid prototyping of the male-molds of photopolymer resin tenon/mortise in ambient environment; formation and sealing of silicone-rubber female-mold and casting of photo-elastic models in vacuum.The preliminary results show that the quality of the photo-elastic model fabricated by the newly-developed technique was remarkably higher than that produced by the conventional method.For example,the initial stress of the models was decreased by 50% and the production cycle was reduced by two-thirds.In addition to environmental friendliness,the novel technique outperforms the conventional one because of better quality,higher precision,greater success-rate,higher level of automation and shorter production cycle.We suggest that the newly-developed technique be of much technological interest in design and photo-elastic study of the aero-engine. © 2016, Science Press. All right reserved.


Lu Y.-H.,China Aviation Powerplant Research Institute | Lu Y.-H.,Aviation Key Laboratory of Aerospace engine Vibration Technology | Mei Q.,China Aviation Powerplant Research Institute | Mei Q.,Aviation Key Laboratory of Aerospace engine Vibration Technology | And 3 more authors.
Tuijin Jishu/Journal of Propulsion Technology | Year: 2014

The dynamical characteristics were investigated through finite element analysis, natural mode experiments and dynamical stress tests, in order to evaluate the reliability of a certain high rotation speed compressor blade. The error analysis shows that the relative errors between calculation and modal tests were less than 4%, while the test errors for the dynamical stress tests increased rapidly when the rotation speed was higher than 43 kr/min. It highlights the necessity to use the vibration stress obtained by the tests during operation to correct the calculation results to evaluate the reliability of the blades efficiently. The research indicates, only the responses at first bending mode caused by the 3 times and 4 times of rotation speed were obvious, however the two resonance points were lower than and far from the idle rotation speed, and the vibration stresses caused by the other resonance points obtained by theoretical results were small and would not lead to any serious damage for the blade.


Chen R.,Xi'an Jiaotong University | Ouyang W.,Xi'an Jiaotong University | Xu J.,Xi'an Jiaotong University | Yuan X.,Xi'an Jiaotong University | Li Y.,Aviation Key Laboratory of Aerospace Engine Vibration Technology
Proceedings - 2013 IEEE International Symposium on Assembly and Manufacturing, ISAM 2013 | Year: 2013

The Squeeze film damper has been extensively researched for engineering application. The conceptual design work in this article includes the description, induction and classification of the squeeze film damper structure, and a brief analysis of the structural features and performance characteristics. Then analytical expression of oil film force of typical local structure in hydrostatic feedback squeeze film damper was put forward, Which can support performance control. The effect law of outside incentives on key parameters and performance of the squeeze film damper was analyzed, and the environmental suitability of this damper was discussed. Therefore a variable structure damper was proposed. The stiffness coefficients and damping coefficients were not constant, but a time-varying function related to environmental conditions. The characteristics of vibration elimination applied to rolling shaft system and the development conceive of squeeze film damper were discussed from the viewpoint of environmental suitability. The design ideas of this variable structure damper provided a theoretical feasibility of damper in the direction of time-varying. © 2013 IEEE.


Chen R.,Xi'an Jiaotong University | Ouyang W.,Xi'an Jiaotong University | Xu J.,Xi'an Jiaotong University | Yuan X.,Xi'an Jiaotong University | Li Y.,Aviation Key Laboratory of Aerospace Engine Vibration Technology
Proceedings - 2013 IEEE International Symposium on Assembly and Manufacturing, ISAM 2013 | Year: 2013

Aiming at the damping and vibration isolation needs for high-speed rotor-bearing system, a variable structure damper was proposed, of which the stiffness and damping coefficients are not constant, but time-varying functions triggered by environmental events. The variable structure principles of stiffness components and damping elements in this new damper were analyzed. The mathematics and mechanics model of a single component were developed. The changing relationship of components critical mechanical parameters (stiffness and damping coefficients) with environmental factors was researched, and its movement and forces were analyzed. The four kinds of dampers were obtained to the point of function matching through the assembly of different parameters, wherein three kinds of variable structure damper. The impact of different preset forces, fluid temperature and structural parameters in two throttle type of pores and capillary on stiffness and damping coefficients of damping was analyzed. A traffic model of atypical hole throttling form was obtained through experimental modeling. About the three kinds of variable structure damper, its applications in engineering were explored from function features, application objects, working conditions, installation and arrangement way. This study provided a theoretical support for the development and application of the low failure probability and high reliability variable structure damper. © 2013 IEEE.


Lu Y.,China Aviation Powerplant Research Institute | Lu Y.,Aviation Key Laboratory of Aerospace engine Vibration Technology | Mei Q.,China Aviation Powerplant Research Institute | Mei Q.,Aviation Key Laboratory of Aerospace engine Vibration Technology | And 6 more authors.
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2014

Vibration characteristics analysis by using the finite element method (FEM) was conducted on an aero-engine accessory gear. To validate the results, the modal test and bench test were done to the gear and the vibration frequencies and modes on the working condition were pursued. The test results are consistent well with the FEM analysis and the transmission torque has little influence on the vibration frequencies of the gear. This work provides important reference to the dynamic characteristics analysis of other similar accessory gears.

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