In order to investigate the dynamic test for pivot point of the omni-axial movable flexible joint nozzle,a test system basted on laser displacement sensor and measurement device was designed in this paper.By setting up mathematical model and con-structing a set of experimental system,the dynamic test data of pivot point was obtained by the data-acquisition system.The dynamic response speed of the test system was guaranteed by laser displacement sensor with high precision and high frequency.The problem of sensor accurate positioning was solved by the SPC leveling mechanism.Disturbance signals were eliminated by data processing.The sampling frequency and the output data frequency are respectively about 2 kHz and 1 kHz.Compared with static method,the relative error was not greater than 1%. Test result shows that the system can measure the track of pivot point reliably in real time when the flexible join nozzle is omni-axial moving.%为了开展柔性喷管全轴摆动动态摆心测试，设计了一种以激光位移传感器、测控装置为基础的测试系统。通过建立数学模型，搭建试验测量装置，利用数据采集处理系统得到了动态摆心漂移数据。该系统采用高精度高频响的激光位移传感器保证了动态响应速度，程控调平机构解决了传感器的精确定位问题，软硬件滤波较好地剔除了扰动信号。系统采样频率2 kHz，输出测量数据频率不低于1 kHz；与静态方法相比较，测量相对误差不大于1％。结果表明，该系统能够准确、实时地测试喷管全轴摆动时的摆心漂移轨迹。
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