航空矢量喷管测试平台用六分量盒式天平结构设计

为了满足航空发动机推力矢量高精度测量的需求,研制了一种结构紧凑的能够实现推力矢量彻底分解的六分量盒式天平.该天平关键结构包括:三维传感器、固定框和浮动框.其中三维传感器的弹性体采用串、并联组合的结构型式.基于有限元分析,对传感器弹性体的设计进行了模拟,结果显示传感器各测力元件对本分量载荷作用敏感程度均远高于其他分量,支撑元件也较好地阻隔了各测力元件之间的相互干扰,该结论也通过了传感器的校准验证.六分量盒式天平整体的刚度和模态分析结果:天平无需做弹性角修正;1阶固有频率为218.8Hz,高于设计指标180Hz.六分量盒式天平校准表明:天平各分量精确度优于3‰,准确度优于5‰. 

Design on structure of six-component box balance for the aero-engine vector nozzle measuring platform

In order to meet the high precision measurement needs of aero-engine thrust vector, a compact six-component box balance enabling complete decomposition of thrust vector was developed.The balance was mainly composed of three parts: three-component sensors, fixed frame and floating frame.The elastic component of three-component sensor adopted the form of series-parallel combined structure.The simulation of the sensor's elastic component by using the finite element analysis methods showed each measuring component's sensitivity to its own component loading was much higher than other components, and the support components also preferably cut off the interference among measuring components.This conclusion was also verified by the sensor calibration.Through the stiffness and modal analysis of the six-component box balance, the results prove that the balance doesn't need elastic angle correction and the first order natural frequency of the balance is 218.8Hz, which is superior to the design index 180Hz.The six-component box balance calibration shows that the precision of the balance is lower than 3‰ and the accuracy is lower than 5‰.