A Vibration Suppression Method for the Multistage Rotor of an Aero-Engine Based on Assembly Optimization
Abstract
:1. Introduction
- The mathematical relationship between the assembly angles of the rotors at all stages and the vibration responses should be established;
- The vibration responses of the critical nodes on the rotor should be taken as the optimization objective to calculate the optimal assembly angles.
2. Methods
2.1. Single-Node Dynamics Model for a Rotor with Geometric and Mass Eccentricities
2.2. Dynamics Model of the Shaft Element of a Rotor
2.3. Error Transfer Model of the Geometric and Mass Eccentricities
2.3.1. Coordinate Transfer
2.3.2. Decomposition of the Geometric and Mass Eccentricities Errors
2.4. Dynamics Model of a Multistage Rotor System
2.5. Solution Method of the Nodal Vibration Responses
2.6. Optimization Objective
3. Results
3.1. Simulation
3.1.1. Finite Element Model of a 4-Stage Rotor
3.1.2. The Machined Rotor According to the 4-Stage Rotor
3.1.3. Optimization of the Assembly Angles
3.1.4. Effects of Stiffness and External Force on the Vibration Responses
3.2. Experimental Verification
4. Discussion
5. Conclusions
- The mathematical relationship between the assembly angles of the rotors at all stages and the nodal vibration responses was established by combining the error transfer model of the geometric and mass eccentricities with the dynamics model of the multistage rotor system.
- An optimization function was developed, which takes the assembly angles as the optimization variables and the maximum vibration velocity at the bearings as the optimization objective. Then, the optimal assembly angles that can minimize the maximum vibration velocity at the bearings were calculated in the simulation.
- The experimental results showed that the maximum vibration velocity at the bearings of the four-stage rotor system under the optimal assembly was reduced by 69.6% and 45.5% compared with that under the worst assembly and default assembly.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A
Element | ln [mm] | Dn [mm] | dn [mm] |
---|---|---|---|
1 | 2 | 20 | 0 |
2 | 16.5 | 33 | 0 |
3 | 5 | 33 | 0 |
4 | 3.5 | 33 | 0 |
5 | 8 | 35 | 0 |
6 | 5 | 35 | 0 |
7 | 2 | 39 | 0 |
8 | 2 | 42 | 0 |
9 | 26 | 42 | 27 |
10 | 24 | 42 | 27 |
11 | 3 | 58 | 36 |
12 | 3 | 58 | 0 |
13 | 8 | 82 | 0 |
14 | 15 | 192 | 0 |
15 | 5 | 82 | 0 |
16 | 3 | 82 | 0 |
17 | 3.5 | 82 | 54 |
18 | 24 | 82 | 72 |
19 | 50 | 82 | 72 |
20 | 3.5 | 102 | 72 |
21 | 3 | 110 | 72 |
22 | 7 | 110 | 74 |
23 | 19.5 | 82 | 74 |
24 | 3.5 | 82 | 56 |
25 | 3 | 128 | 56 |
26 | 10 | 128 | 48 |
27 | 34 | 128 | 112 |
28 | 46 | 128 | 112 |
29 | 7 | 128 | 48 |
30 | 5 | 128 | 50 |
31 | 3 | 128 | 33 |
32 | 6.5 | 68 | 33 |
33 | 30 | 42 | 33 |
34 | 20.5 | 42 | 33 |
35 | 11 | 42 | 0 |
36 | 2 | 39 | 0 |
37 | 5 | 35 | 0 |
38 | 8 | 35 | 0 |
39 | 3.5 | 33 | 0 |
40 | 5 | 33 | 0 |
41 | 16.5 | 33 | 0 |
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Unbalanced Mass Points | un [g] | Coordinates of En [mm] |
---|---|---|
E1 | 0.296 | (17.25, 0, 35) |
E2 | 0.197 | (38.5, 0, 58.5) |
E3 | 0.314 | (60, 0, 77) |
E4 | 0.178 | (18.75, 0, 36.5) |
Components | ξn [mm] | h1 [mm] | w1 [mm] | δn [°] |
---|---|---|---|---|
Rotor-1 | (0.0181, 0.0062, 65.0152) | 0.0193 | 36.0220 | 113 |
Rotor-2 | (−0.009, −0.0223, 115.0210) | 0.0235 | 101.9895 | 29 |
Rotor-3 | (0.0056, 0.0244, 138.1047) | 0.0241 | 50.0149 | 242 |
Rotor-4 | (0.0116, 0.0124, 74.9581) | - | - | 182 |
Position | Vibration Velocity [mm/s] | Vibration Displacement [mm] | Vibration Acceleration [mm/s2] |
---|---|---|---|
Node-6 | 4.4630 | 0.0141 | 1.4044 × 103 |
Node-38 | 3.5759 | 0.0113 | 1.1259 × 103 |
Position | Vibration Velocity [mm/s] | Vibration Displacement [mm] | Vibration Acceleration [mm/s2] |
---|---|---|---|
Node-6 | 40.5936 | 0.1285 | 1.2785 × 104 |
Node-38 | 57.4941 | 0.1820 | 1.8076 × 104 |
Position | Vibration Velocity [mm/s] | Vibration Displacement [mm] | Vibration Acceleration [mm/s2] |
---|---|---|---|
Node-6 | 7.5441 | 0.0239 | 2.3778 × 103 |
Node-38 | 10.8975 | 0.0345 | 3.4298 × 103 |
Position | Vibration Velocity [mm/s] | Vibration Displacement [mm] | Vibration Acceleration [mm/s2] |
---|---|---|---|
Node-6 | 2.9001 | 0.0093 | 0.9149 × 103 |
Node-38 | 2.1121 | 0.0074 | 0.8221 × 103 |
Position | Vibration Velocity [mm/s] | Vibration Displacement [mm] | Vibration Acceleration [mm/s2] |
---|---|---|---|
Node-6 | 25.1136 | 0.0795 | 7.9071 × 103 |
Node-38 | 34.0271 | 0.1077 | 1.0713 × 104 |
Position | Vibration Velocity [mm/s] | Vibration Displacement [mm] | Vibration Acceleration [mm/s2] |
---|---|---|---|
Node-6 | 4.4776 | 0.0176 | 1.7205 × 103 |
Node-38 | 7.9312 | 0.0284 | 2.4682 × 103 |
External Force [N] | Vibration Velocity at Node-6 [mm/s] | Vibration Velocity at Node-38 [mm/s] |
---|---|---|
0 | 4.4630 | 3.5759 |
5 | 4.3109 | 3.1741 |
10 | 4.1034 | 2.4683 |
External Force [N] | Vibration Displacement at Node-6 [mm] | Vibration Displacement at Node-38 [mm] |
---|---|---|
0 | 0.0141 | 0.0113 |
5 | 0.0128 | 0.0088 |
10 | 0.0117 | 0.0064 |
External Force [N] | Vibration Acceleration at Node-6 [mm/s2] | Vibration Acceleration at Node-38 [mm/s2] |
---|---|---|
0 | 0.9149 × 103 | 0.8221 × 103 |
5 | 0.8058 × 103 | 0.6072 × 103 |
10 | 0.7129 × 103 | 0.4305 × 103 |
State | Maximum of fl(γ) [mm/s] | Maximum of fr(γ) [mm/s] |
---|---|---|
Optimal assembly | 20.2505 | 17.1042 |
Worst assembly | 66.5348 | 55.5799 |
Default assembly | 37.1793 | 32.4968 |
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Chen, Y.; Cui, J.; Sun, X. A Vibration Suppression Method for the Multistage Rotor of an Aero-Engine Based on Assembly Optimization. Machines 2021, 9, 189. https://doi.org/10.3390/machines9090189
Chen Y, Cui J, Sun X. A Vibration Suppression Method for the Multistage Rotor of an Aero-Engine Based on Assembly Optimization. Machines. 2021; 9(9):189. https://doi.org/10.3390/machines9090189
Chicago/Turabian StyleChen, Yue, Jiwen Cui, and Xun Sun. 2021. "A Vibration Suppression Method for the Multistage Rotor of an Aero-Engine Based on Assembly Optimization" Machines 9, no. 9: 189. https://doi.org/10.3390/machines9090189