轴对称矢量喷管运动学建模及运动轨迹分析
Kinematic Modeling and Trajectory Analysis of Axisymmetric Vectoring Nozzle
张昊 1张起梁 1孟令超 1罗忠 2宋慧涛3
作者信息
- 1. 辽宁工业大学机械工程与自动化学院,辽宁锦州 121001
- 2. 东北大学机械工程与自动化学院,沈阳 110819
- 3. 中国航发沈阳发动机研究所,沈阳 110015
- 折叠
摘要
轴对称矢量喷管为复杂的空间多链路机构,是推力矢量技术的核心.为研究其运动规律,将空间机构位置分析法、解析几何法和环路矢量法相结合,建立了轴对称矢量喷管的空间运动学模型.利用数值仿真实现了其运动姿态的仿真,并通过与ADAMS仿真结果对比,验证了该模型的正确性,进而获得轴对称矢量喷管在不同驱动方式下的位姿以及喉口和喷口的面积变化规律.结果表明:喉口状态和喷管运动状态对喷管面积比均有影响,面积比随着A9作动筒的同步伸长呈明显单调递增状态;A9作动筒异步驱动时,喷管面积比变化较小,喷口矢量偏转角角速度与作动筒运动速度呈比例关系,截面形状由圆形逐渐变为空间上扭曲的椭圆形;拉杆尺寸对喷管机构的面积比变化范围有明显影响,拉杆每增大(或减小)1 mm,面积比变化区间整体上移(或下移)0.025.仿真结果有助于了解喷管的运动规律,可为喷管的参数化分析及优化设计提供理论依据.
Abstract
The Axisymmetric Vectoring Nozzle is a complex spatial multi-link mechanism,which is the core of thrust vectoring technology.To study its motion law,a spatial kinematic model of an axisymmetric vector nozzle was established by combining the position analysis method of spatial mechanism,analytical geometry method,and loop vector method.The motion attitude of the axisymmetric vec-tor nozzle was numerically simulated.The correctness of the model was verified by comparing it with ADAMS simulation results.Then the position and attitude of the axisymmetric vector nozzle under different driving modes and the variation laws of the throat and nozzle area were obtained.The results show that both the throat state and the nozzle motion state influence the nozzle area ratio,the area ratio increases monotonously with the synchronous elongation of the A9 actuator.When the A9 actuator is driven asynchronously,the change in the nozzle area ratio is small.The angular velocity of the nozzle vector deflection is proportional to the motion velocity of the actuator,and the shape of the cross-section gradually changes from a circle to a spatially distorted oval shape.The sizes of the linkrods have a significant influence on the variation range of the area ratio of the nozzle mechanism,for every 1 mm increase(or decrease)in the linkrod,the varia-tion range of the area ratio shifts up(or down)by 0.025 as a whole.The simulation results provide insight into the nozzle motion laws,which provide a theoretical basis for the parametric analysis and optimization design of the nozzle.
关键词
轴对称矢量喷管/空间多链路/运动学建模/仿真/位姿/运动轨迹/航空发动机Key words
axisymmetric vectoring nozzle/spatial multi-link/kinematic modeling/simulation/position and attitude/motion trajectory/aeroengine引用本文复制引用
出版年
2024
NETL
NSTL
万方数据