Dynamic Characteristics of Adjustable Vector Nozzles Considering Joint Clearance

doi:10.12068/j.issn.1005-3026.2025.20230219

Abstract

Abstract:

Aiming at the problem of poor kinematic stability of the adjustable vector nozzle mechanism used in the aero‑engine system， the effect of clearance on its dynamic characteristics was studied. Firstly， the dynamic model of the adjustable vector nozzle single‑chain mechanism was established using the first type of Lagrange equation， and the driving force variation curve of the single‑chain mechanism was obtained. Then， the contact force model proposed by Lankarani and Nikravesh and the modified Coulomb friction model were used to establish the moving pair clearance model， which was constructed in the dynamic simulation software by using the function. Finally， a dynamic model of the single‑chain mechanism with joint clearance was established based on the virtual prototyping technology. The effects of clearance position and clearance size on the dynamic characteristics of the adjustable vectoring nozzle mechanism were simulated and analyzed. The results showed that the larger the clearance and aerodynamic force arm， the more significant the fluctuation of the system dynamics characteristics. As the joint clearance size increases within the small clearance range， the fluctuation amplitude of the dynamic characteristics of the adjustable vector nozzle mechanism decreases first and then increases. When the clearance between the triangular rod and the steering control ring is 0.3 mm， the system dynamics become the most stable.

Key words: aircraft engine, adjustable vector nozzle, dynamic modeling, joint clearance, dynamic characteristics

CLC Number:

V 231.91

Zhong LUO, Jiang ZHAO, Chun-yang XU, Hang CAO. Dynamic Characteristics of Adjustable Vector Nozzles Considering Joint Clearance[J]. Journal of Northeastern University(Natural Science), 2025, 46(1): 61-67.

Figures/Tables 14

Fig.1 Single‑chain structure diagram of the typical AVEN device

Fig.2 Kinematic diagram of the adjustable vector nozzlesingle‑chain mechanism

Fig.3 Structural diagram of the clearance model

Fig.4 Coefficient change curve of the modified Coulombfriction model

Fig.5 Virtual prototype model of the adjustable vector nozzle

Table 1 Kinematic pair relationship between components

关节序号	构件1	构件2	约束	运动副	关节序号	构件1	构件2	约束	运动副
关节1	大地	机匣	固定约束	固定	关节7	扩张调节片	十字接头	固定约束	固定
关节2	机匣	收敛骨架	转动约束	旋转副	关节8	连杆	扩张调节片	固定约束	固定
关节3	收敛骨架	滚子	线-线约束	凸轮副	关节9	三角拉杆	连杆	转动约束	旋转副
关节4	收敛调节环	滚子	固定约束	固定	关节10	转向控制环	三角拉杆	转动约束	旋转副
关节5	收敛调节环	大地	移动约束	移动副	关节11	转向控制环	大地	移动约束	移动副
关节6	十字接头	收敛骨架	转动约束	旋转副

Fig.6 Variation curves of driving forces with time

Table 2 Material properties of main components

构件	材料	弹性模量E/GPa	泊松比	恢复系数
收敛骨架	K424	213	0.300	0.90
滚子	GH2132	195	0.305	0.93
连杆	TC6	125	0.300	0.84
三角拉杆	TC6	125	0.300	0.84

Table 3 Distribution of clearance locations

间隙位置编号	关节	构件1	构件2
1	2	机匣	收敛骨架
2	6	收敛骨架	十字接头
3	9	连杆	三角拉杆
4	10	三角拉杆	转向控制环

Fig.7 Dynamic characteristic curves of the system with different clearance positions driven by the steering control ring

Fig.8 Dynamic characteristic curves of the system with different clearance positions driven by the convergence regulator ring

Fig.9 Change curves of impact force of the joint 10 with different clearances

Fig.10 Change curves of angular velocity variation of the convergent skeleton deflection with different clearances

Fig.11 Change curves of contact force of the joint 3 with different clearances

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