Yang Z, Chen H, Yu T, Li B
School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China.
Xi'an Aerospace Propulsion Institute, Xi'an 710100, China.
Rev Sci Instrum. 2016 Aug;87(8):085105. doi: 10.1063/1.4960094.
The high-precision ball bearing is fundamental to the performance of complex mechanical systems. As the speed increases, the cage behavior becomes a key factor in influencing the bearing performance, especially life and reliability. This paper develops a high-precision instrument for analyzing nonlinear dynamic behavior of the bearing cage. The trajectory of the rotational center and non-repetitive run-out (NRRO) of the cage are used to evaluate the instability of cage motion. This instrument applied an aerostatic spindle to support and spin test the bearing to decrease the influence of system error. Then, a high-speed camera is used to capture images when the bearing works at high speeds. A 3D trajectory tracking software tema Motion is used to track the spot which marked the cage surface. Finally, by developing the matlab program, a Lissajous' figure was used to evaluate the nonlinear dynamic behavior of the cage with different speeds. The trajectory of rotational center and NRRO of the cage with various speeds are analyzed. The results can be used to predict the initial failure and optimize cage structural parameters. In addition, the repeatability precision of instrument is also validated. In the future, the motorized spindle will be applied to increase testing speed and image processing algorithms will be developed to analyze the trajectory of the cage.
高精度滚珠轴承是复杂机械系统性能的基础。随着转速的增加，保持架的行为成为影响轴承性能的关键因素，尤其是寿命和可靠性。本文开发了一种用于分析轴承保持架非线性动态行为的高精度仪器。保持架旋转中心的轨迹和非重复性跳动（NRRO）用于评估保持架运动的不稳定性。该仪器采用空气静压主轴来支撑和旋转测试轴承，以减少系统误差的影响。然后，当轴承高速运转时，使用高速摄像机捕捉图像。使用3D轨迹跟踪软件tema Motion跟踪标记在保持架表面的点。最后，通过开发Matlab程序，利用李萨如图形评估不同转速下保持架的非线性动态行为。分析了不同转速下保持架的旋转中心轨迹和NRRO。结果可用于预测初始故障并优化保持架结构参数。此外，该仪器的重复性精度也得到了验证。未来，将应用电动主轴提高测试速度，并开发图像处理算法来分析保持架的轨迹。
