Modeling and simulation of the assembly accuracy of aero-engine rotors in the docking processes using a specially designed novel multi-DOF NC motion platform

2021 ◽  
pp. 106648
Author(s):  
Tianyi Zhou ◽  
Hang Gao
Keyword(s):  
Modeling And Simulation ◽  
Motion Platform ◽  
Assembly Accuracy ◽  
Aero Engine ◽  
Engine Rotors

An improved Jacobian-Torsor model for statistical variation solution in aero-engine rotors assembly

2020 ◽  
pp. 095440542095876
Author(s):  
Siyi Ding ◽  
Xiaohu Zheng ◽  
Jinsong Bao ◽  
Jie Zhang
Keyword(s):  
Three Dimensional ◽  
Statistical Variation ◽  
Variation Propagation ◽  
Aero Engine ◽  
Core Components ◽  
Key Issues ◽  
Assembly Technology ◽  
Parts Manufacturing ◽  
Rotor Assembly ◽  
Engine Rotors

Rotor assembly is one of the core components of aero-engine, which basically consists of multistage revolving components. With the influence of parts’ manufacturing errors and practical assembly technology, assembly variations are unavoidable which will cause insecurity and unreliable of the whole engine. Statistical variation solution is a feasible means to analyze assembly precision. When using the three-dimensional variation analysis in rotor assembly, two key issues cannot be well solved, which involve the variation expression (the over-positioning problem of multiple datums) and the variation propagation (revolving characteristic of the rotors). To overcome the deficiency, extended Jacobian matrix and updated torsor equation were derived and unified, which eventually resulted in the improved Jacobian-Torsor model. This model can both provide rotation regulating mechanism by introducing the revolution joint, and characterize the interaction between essential mating features. Multistage rotational optimization of four-stage aero-engine rotors assembly has been performed to demonstrate this solution in statistical way. Results showed that the proposed model was applicable and conducive to precision prediction and analysis in design preliminary stage.

Kinematic and Workspace Simulation of Flexible Assembly Tooling for Aero-Engine

2013 ◽  
Vol 385-386 ◽  
pp. 212-215
Author(s):  
Hong Shi ◽  
Wei Nan Li ◽  
Ning Zhu
Keyword(s):  
Inverse Kinematics ◽  
Practical Significance ◽  
Dimensional Synthesis ◽  
Accuracy Improvement ◽  
Flexible Assembly ◽  
Assembly Accuracy ◽  
Aero Engine ◽  
Different Types ◽  
Aero Engines ◽  
Assembly Performance

This article, combining the robot theory, applies the serial parallel manipulator to the configuration to design a flexible assembly tooling, which is used for aero-engines of different types and models. First, the inverse kinematics solution and workspace are analyzed, then a model in Adams is built to simulate the kinematic characteristics. Finally, the simulation result is used to contrast with the theoretical calculation to verify the correctness, and to solve forward kinematics. This work has outstanding theoretical and practical significance for assembly accuracy improvement, optimizing assembly performance and dimensional synthesis.

A method to control the amount of unbalance propagation in precise cylindrical components assembly

2019 ◽  
Vol 233 (13) ◽  
pp. 2458-2468 ◽  
Author(s):  
Chuanzhi Sun ◽  
Ming Hu ◽  
Yongmeng Liu ◽  
Maowei Zhang ◽  
Zewei Liu ◽  
...  
Keyword(s):  
Measurement Error ◽  
Tolerance Design ◽  
Machining Error ◽  
The Real ◽  
Assembly Strategy ◽  
Assembly Accuracy ◽  
Aero Engine ◽  
Assembly Guidance ◽  
Assembly Error ◽  
Optimal Assembly

The article provides a novel method to control the amount of unbalance propagation in precise cylindrical components assembly, which takes the machining error, the measurement error, and the assembly error into account. The coefficient and the correction factor matrices of mass eccentric deviations are defined to analyze the amount of unbalance propagation by building the connective assembly model. The influence of the machining error, the measurement error, and the assembly error on the mass center is analyzed in the assembly. The cumulative mass eccentric deviation can be reduced stage by stage in the assembly, and the amount of unbalance of final assembly can be minimized by controlling the assembly angle of each component. The effectiveness of the proposed method is verified by the assembly of the real aero-engine using the optimal assembly strategy. Compared to the worst assembly strategy, the values of the amount of unbalance using the optimal assembly strategy are reduced by 20%, 76%, and 79% for two, three, and four components assembly, respectively. Besides, the reasonable tolerance design area for each component is obtained with the proposed method for the real aero-engine assembly with four components. The proposed method can improve the assembly accuracy of cylindrical components and can be used for assembly guidance and tolerance design, especially for the assembly of multistage precise cylindrical components.

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