AVIC Shenyang Aerospace engine Design Institute

Shenyang, China

AVIC Shenyang Aerospace engine Design Institute

Shenyang, China
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Luo Z.,Northeastern University China | Guo J.,Jiangsu Radio Factory Co. | Zhu Y.,University of Sheffield | Han Q.,Dalian University of Technology | Wang D.,AVIC Shenyang Aerospace engine Design Institute
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2016

In allusion to the design problems of the rotating straight blade similitude model, a design method of the dynamic similitude model, with the consideration of the requirement of static strength, is presented. The rotating structure composed by the blade disk and single straight blade is considered as the research object, where the vibration theory of plates and shells is applied to establish the governing equation; and the inertial force and aerodynamic force of the rotating straight blade are equivalent to the effect of static load on the blade. The strength design criteria are established based on the stress analysis of the blade, and the equation analysis method is adopted to establish the dynamic scaling laws. The conclusion, that when the material of the model and the prototype are different, the incomplete geometric similitude model should be employed to meet the strength requirement, is theoretically proved. The effectiveness of the similitude design approach is validated by using the numerical simulation method in a designed example. The results provide some theory supplements for the dynamic similitude model design of such rotating plate components. © 2016 Journal of Mechanical Engineering.


Luo Z.,Northeastern University China | Wang Y.,Northeastern University China | Zhu Y.,Northeastern University China | Zhao X.,University of Sheffield | Wang D.,AVIC Shenyang Aerospace engine Design Institute
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science | Year: 2016

For the design problem of dynamic similitude models of an aero engine's turbine discs, distorted scaling laws and structural size intervals of thin walled annular plates are established in the research. According to the governing equation, the geometrically complete scaling law of thin walled annular plates is firstly established. In order to determine accurate distorted scaling laws of thin walled annular plates, three significant principles are proposed and theoretically proved combining the governing equation and the sensitivity analysis. According to results of the sensitivity analysis, accurate distorted scaling laws of thin walled annular plates are obtained based on significant principles. In addition, structural size intervals of distorted scaling laws of thin walled annular plates are calculated by the numerical method. Finally, the previous six orders' natural frequencies of thin walled annular plates are discussed as examples to verify the theory presented in this research, and distorted scaling laws of each order's natural frequency are obtained and the corresponding structural size intervals are analyzed. © IMechE 2015.


Luo Z.,Northeastern University China | Zhu Y.,Northeastern University China | Chen X.,Northeastern University China | Zhao X.,University of Sheffield | Wang D.,AVIC Shenyang Aerospace engine Design Institute
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2014

In allusion to the problem of designing the similitude test model of laminated composite plate, a confirm method of the structure size applicable interval of distortion test model is put forward under the condition to have the same nature characteristics. With the method of combining the dimensional analysis and governing equation analysis, the completely scaling laws and the distortion scaling laws between the model of laminated composite plate and its prototype are established, three scaling laws of the prototype are yielded. Then a laminated composite plate which is in common use is taken as an example, under the study of the structure size applicable interval which kept the same first-order nature characteristic (nature frequency and vibration mode), comparing with finite element analysis and resolving analysis to obtain the structure size applicable interval of distortion test model when the model and the prototype is in different orders with the same nature characteristics. Test results reveal that this work lays a theoretical foundation for the similar model structural design for such laminated composite plate. © 2014 Journal of Mechanical Engineering.


Luo Z.,Northeastern University China | Zhang K.,Northeastern University China | Han Q.,Dalian University of Technology | Wang D.,AVIC Shenyang Aerospace engine Design Institute
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

Simplified design method is studied based on the dynamical similarity theory due to the problem of vibration analysis experiments of thin-walled short cylindrical shell with annular labyrinth (TWSCSAL). The thin-walled short cylindrical shell with three annular labyrinths is a typical object. The mathematical model is set up by using Donnell type nonlinear strain-displacement relations, and the frequency equation of TWSCSAL is obtained. The dynamic similar law between model and prototype is solved with dimensional analysis method. The similar design method of incomplete geometric similar model is studied particularly, and the theoretical formula is obtained. In order to illustrate the similar design method, the three annular labyrinths thin-walled short cylindrical shell are simplified for T shapes. The similar methods such as one annular labyrinth simplified for T shapes, two annular labyrinths simplified for T shapes and three annular labyrinths simplified for T shapes are put forward respectively. The natural frequencies and mode shapes of model and prototype are compared by using the finite element method. And the correctness and effectiveness of the similarity design method is verified. © 2013 Journal of Mechanical Engineering.


Luo Z.,Northeastern University China | Zhu Y.,Northeastern University China | Han Q.,Dalian University of Technology | Wang D.,AVIC Shenyang Aerospace Engine Design Institute
Advances in Mechanical Engineering | Year: 2015

This study investigates a method of designing a simplified cylindrical shell model. This model accurately predicts the dynamic characteristics of a prototype cylindrical shell with sealing teeth accurately. The significance of this study is that it provides an acceptable process which guides the design of test models. Firstly, an equivalent cylindrical shell with rectangular rings is designed by combining the energy equation and numerical analysis. Then the transfer matrixes of the stiffened cylindrical shell and the cylindrical shell are employed to calculate the equivalent thickness of the simplified cylindrical shell commonly used in model tests. Further, the equivalent thicknesses are normalized by introducing an average equivalent thickness. The distorted scaling laws and size applicable intervals are investigated to reduce the errors caused by the normalization. Finally, a 42CrMo cylindrical shell with sealing teeth is used as a prototype and a number 45 steel scaled-down cylindrical shell is used as a distorted test model. The accuracy of the prediction is verified by using experimental data, and the results indicate that the distorted model can predict the characteristics of the stiffened cylindrical shell prototype with good accuracy. Copyright © Zhong Luo et al.


Luo Z.,Northeastern University China | Zhu Y.,Northeastern University China | Zhao X.,University of Sheffield | Wang D.,AVIC Shenyang Aerospace engine Design Institute
Journal of Engineering Mechanics | Year: 2016

This study investigates new dynamic scaling laws of geometrically distorted models in predicting the dynamic characteristics of a cantilever plate. The significance of this study is to provide new scaling laws and rules for selecting dynamic scaling laws, which guide the design of distorted models. By considering the size effect of different orders' vibration, a governing equation and the method of sensitivity analysis are employed to establish dynamic scaling laws between the model and the prototype. Both approximate and accurate scaling laws are investigated and the processes for determining these scaling laws are summarized. After that, a commonly used titanium alloy plate is analyzed as a prototype to compare the accuracy of the approximate scaling laws and the accurate scaling laws. Finally, the applicability of these new scaling laws is validated by experimental data. The results indicate that, by using the new scaling laws, the distorted models can predict the characteristics of the titanium alloy plate prototype with good accuracy. © 2015 American Society of Civil Engineers.


Luo Z.,Northeastern University China | Zhu Y.P.,Northeastern University China | Zhao X.Y.,University of Sheffield | Wang D.Y.,AVIC Shenyang Aerospace engine Design Institute
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science | Year: 2015

This study investigates the applicability of distortion models for predicting dynamic characteristics of a rotating thin-wall short cylindrical shell. The significance of this study is that it provides a necessary scaling law, applicable structure size intervals, and its boundary functions, which can guide the design of distortion models. Sensitivity analysis and governing equations are employed to establish the scaling law between the model and the prototype. Then a commonly used 7050 aluminum alloy cylindrical shell is analyzed as a prototype. The determination of applicable structure size intervals is discussed, and the boundary functions of the applicable structure size intervals are investigated. The applicability of the scaling law and the applicable intervals of rotating thin-wall short cylindrical shell are verified numerically. The results indicate that distortion models that satisfy the structure size applicable intervals can predict the characteristics of the prototype with good accuracy. © IMechE 2014.


Zhu Y.,Northeastern University China | Luo Z.,Northeastern University China | Zhao X.,University of Sheffield | Wang D.,AVIC Shenyang Aerospace engine Design Institute
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering | Year: 2016

In designing the test model of thin-walled cylindrical shells, geometrically distorted models are widely used. This study investigates a method of designing a distorted cylindrical shell model by considering the strength requirement, which means the test model should reflect the strength situation or even failures of the prototype. The significance of this study is that it provides an acceptable process which guides the design of test models. First, governing equations are employed to derive the scaling law of the natural frequency. The harmonic response is calculated in order to obtain the scaling law of the vibration response amplitude. As the study is based on governing equations of elastic cylindrical shells, only elastic behavior is discussed. Then considering the different materials' ultimate stress, an excitation force ratio is defined. An applicable size interval is investigated and the range of the excitation force is obtained. Finally, an aluminium alloy cylindrical shell is used as a prototype and a NO. 45 steel scaled down cylindrical shell is used as a distorted test model. The accuracy of the prediction is verified by using simulation data. © IMechE 2015.


Yu M.,Nanjing University of Aeronautics and Astronautics | Chen G.,Nanjing University of Aeronautics and Astronautics | Liu Y.,AVIC Shenyang Aerospace Engine Design Institute | Jiang G.,AVIC Shenyang Aerospace Engine Design Institute | And 3 more authors.
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | Year: 2013

In order to effectively identify aero-engine rotor-stator rubbing positions, an identification method based on casing strain signals is proposed. Two experiment projects are proposed and compared. One is to paste the strain foils along the casing axial direction, the other is to paste them along the casing circumference. A rotor experiment rig of an aero-engine is used to simulate rubbing faults of different radial rubbing positions. The casing strain signals of the rotor experiment rig of the aero-engine is collected and the strain mean features of the two experiment projects are extracted, which are then input into a support vector machine to identify the different rubbing positions. The results show that the strain mean features based on the experiment project which paste strain foils along the casing circumference can effectively identify the rotor-stator rubbing positions of the aero-engine, and the recognition can reach 100%. But the strain mean features based on the project which paste strain foils along the casing axial direction has a lower recognition rate.

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