A new adjustable rotary fluid damper was developed in order to achieve good vibration control effect of helicopter control system with minimum geometric tolerance manufacturing cost. The multi-objective optimization of key geometric parameters was conducted. The rotary valve was driven through a servo motor to realize the real-time adjustment of the damping force in order to realize the vibration control of the helicopter control system. A quasi-static model of the damper was established based on the pressure-flow formula. The influence of structural geometric parameters on the maximum damping torque and adjustable multiple was analyzed. The non-dominated sorting genetic algorithm II (NSGA-II) was used to conduct multi-objective optimization of each structural parameter in order to meet the requirements of damper output torque, dynamic adjustable range and minimum tolerance manufacturing cost at the same time. The optimal structural design parameters of the damper were obtained. Results show that the multi-objective optimal design can achieve the minimum manufacturing cost of tolerance on the premise of satisfying the mechanical properties of the damper. The correctness of the multi-objective optimization results of the damper parameters based on the quasi-static model was verified through the mechanical performance test of the prototype of the adjustable rotary fluid damper.
Fig.1Design scheme of adjustable rotary fluid damper
Fig.2Structural parameter diagram of adjustable rotary fluid damper
参数
初始值
Ds/mm
46
Dr/mm
22
Ly/mm
38
μ /(kg·m?1·s?1)
1.17×10?2
b1/mm
5
b2/mm
6
dh/mm
1.5
δ1/mm
初始值0.03 公差(0.01~0.03)
δ2/mm
初始值0.03 公差(0.01~0.03)
δ3/mm
初始值0.03 公差(0.01~0.03)
lr/mm
3
αr/（°）
9
ω/(rad·s?1)
0.229
Tab.1Initial value of structural parameters of semi-rotary fluid damper
Fig.3Influence of structural parameters on damping torque when rotary valve is fully closed
Fig.4Sensitivity analysis of structural parameters when rotary valve is fully closed
Fig.5Influence of structural parameters on adjustable range of damping moment
Fig.6Sensitivity analysis of influence of structural parameters on adjustable range of damping moment
Fig.7Solution flow chart of NSGA-II
Fig.8Distribution and projection graph of Pareto solution set
序号
f1
f2
f3
1
?3.549
?8.139
1069.473
2
?3.584
?8.093
1067.954
3
?3.586
?8.198
1073.108
修正后
?3.635
?8.205
1067.954
Tab.2Selected Pareto solution
mm
序号
δ1U
δ2U
δ3U
dh
Ds
Dr
Ly
1
0.042
0.040
0.046
1.981
48.86
20.13
38.97
2
0.042
0.039
0.047
1.995
48.77
20.07
38.89
3
0.041
0.040
0.047
1.979
48.63
20.20
39.09
修正后
0.042
0.039
0.047
2
49
20
39
Tab.3Structural parameter values of selected Pareto solution
Fig.9Variation of damping torque with angular velocity
Fig.10Adjustable multiplier changes with angular velocity
Fig.11Diagram of damper prototype
Fig.12Diagram of damper test setup
Fig.13Results of damper performance tests
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