摘要
对轴对称矢量喷管A8面的运动学研究是为了准确调整其大小,从而满足最佳膨胀比系数的要求。首先采用合理的简化方法,用收敛片及其密封片末端形成的内切圆来近似表示不规则的A8面,并且计算了误差,说明其可行性。然后根据设定条件:收敛片的圆弧形凸面通过收敛片两端,建立了A8面运动机构的数学模型。用解析式表示相关部件参数间的关系,不仅避免了计算复杂而又耗时的迭代过程,还使求解思路更加清晰。最终得出了A8做动筒的推进量与收敛片的内切圆面积的函数关系,即A8面收扩的函数表达式。接着进行仿真验证,结果表明所求函数与三维模型中测量的数据吻合,综合A8面函数表达式的准确率达到约96%。
The kinematic relationship of A8 area of AVEN（ Axial-symmetric Vectoring Exhaust Nozzle） is studied for the accurate adjustment and control of its motion and to meet the requirements of the best coefficient of expansion ratio. The irregular A8 area is formed with the back-end of the convergence pieces and the seals,and it is mathematically represented by an inscribed circle. It is indicated that the method of approximate representation is feasible based on error analysis. A kinematics model of the A8 area is built according to the given conditions,namely the cambered surface of the convergence piece comeing across its both ends. With the relatively simple analytical functions for the related variables,the complicated iteration is omitted,which simplifies the solving process. Finally,the relationship between the A8 area and the advance amount of the A8 actuators is obtianed.Simulation results indicate that the function is in accordance with the measured data and the accuracy of the result is about 96%.
出处
《机械科学与技术》
CSCD
北大核心
2016年第6期975-979,共5页
Mechanical Science and Technology for Aerospace Engineering
