MENG Ling-chao 1 ， ZHANG Hao 1 ， ZHANG Qi-liang 1 ， LUO Zhong 2 ， XU Chun-yang 3.Numerical Simulation and Verification of the Influence of Joint Clearance on Dynamic Characteristics ofThrust-vectoring Nozzle Adjusting Mechanism[J].航空发动机,2024,50(3):64-71
Numerical Simulation and Verification of the Influence of Joint Clearance on Dynamic Characteristics ofThrust-vectoring Nozzle Adjusting Mechanism
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Key Words:thrust-vectoring nozzle adjusting mechanism  clearance  Lagrange equation  dynamics  aeroengine
Author NameAffiliation
MENG Ling-chao 1 ， ZHANG Hao 1 ， ZHANG Qi-liang 1 ， LUO Zhong 2 ， XU Chun-yang 3 1. College of Mechanical Engineering and Automation，Liaoning University of Technology，Jinzhou Liaoning 121001，China； 2. School of Mechanical Engineering and Automation，Northeastern University，Shenyang 110819，China； 3. AECC Shenyang Engine Research Institute，Shenyang 110015，China 
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Abstract:In order to study the influence of the joint clearance on the dynamic characteristics of the thrust-vectoring nozzle adjusting mechanism under different flight conditions， an single blade dynamic model of the thrust-vectoring nozzle motion adjusting mechanism considering the characteristics of joint clearance and friction coefficient was built by using the method of combining the first type Lagrange equation with the mixed contact force model and the LuGre friction model， and then the kinematic analysis model of the overall adjusting mechanism was established. The results show that due to the presence of joint clearance， if the motion state of the nozzle adjusting mechanism undergoes abrupt changes， the displacement of the nozzle flap in the initial impact stage is almost not affected by the clearance impact， but the velocity and acceleration of the flap will oscillate violently and momentarily， and the oscillating amplitude is greatly affected by the joint clearance， while the clearance has little effect on the motion accuracy of the flap during the stable motion. When the thrust-vectoring nozzle adjusting mechanism of the whole engine performs the converging and diverging motion， the impact force generated by each joint is almost the same. While performing the up and down deflection motion， the generated impact force is the largest at joint C， followed by joint A， and the impact force at joints B and D is the smallest.
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