A six degree of freedom parallel platform is a motion platform with six degrees of freedom (translation and rotation), which can be used to achieve multi axis motion and precision positioning. However, during use, due to various factors, the axis rotation accuracy of the platform may deviate, affecting its motion accuracy and stability. Therefore, accurate measurement and evaluation of shaft rotation accuracy are crucial for ensuring platform performance.

Measurement method for shaft rotation accuracy

Laser interferometry: Using a laser interferometer to measure the rotational displacement of different axes on the platform, in order to obtain the accuracy of axis rotation.

Angle sensor method: By installing an angle sensor on the platform, real-time measurement of platform angle changes is carried out to evaluate the accuracy of shaft rotation.

Optical measurement method: Using an optical measurement system to measure the image of the platform, the axis rotation accuracy is obtained by calculating the platform rotation angle.

The angle sensor method is used in this positive domain. By installing a North Micro sensor on the platform, real-time angle changes are measured to evaluate the platform's axis rotation accuracy. In this platform's axis rotation accuracy measurement, the repeated positioning accuracy of the platform can reach ± 0.002deg (click on the video account - Positive Domain Technology to watch the measurement process)

Application of shaft rotation accuracy measurement

In the aerospace field, six degree of freedom parallel platforms are widely used in flight simulators, spacecraft and other equipment. Through the measurement and optimization of axis rotation accuracy, the accuracy and authenticity of flight simulations are improved.

In the field of mechanical manufacturing, in precision mechanical manufacturing, the machining accuracy and stability of machine tools are improved by measuring and optimizing the axis rotation accuracy of the six degree of freedom platform.

Ship field: In ship motion control systems, by measuring and calibrating the axis rotation accuracy of the six degree of freedom platform, the navigation stability and safety of ships are improved.

The measurement of axis rotation accuracy of a six degree of freedom parallel platform is of great significance for ensuring the motion accuracy and stability of the platform.

This article not only introduces the method of measuring shaft rotation accuracy, but also evaluates the measurement of the forward six degree of freedom parallel platform using the method, and explores its applications in aerospace, mechanical manufacturing, and shipbuilding fields.

In the future, with the continuous development of sensor technology and data processing algorithms, the accuracy and efficiency of axis rotation accuracy measurement for six degree of freedom parallel platforms will be further improved, providing more possibilities for engineering practice in related fields.

Reference:

Liu, Y., et al. (2019). Measurement of Rotation Accuracy of 6-DOF Motion Platform Based on Laser Interferometer. Optics and Precision Engineering, 27(7), 1726-1733.

Wang, Z., et al. (2020). Measurement Method of 6 DOF Platform’s Rotation Accuracy Based on Angle Sensor. Journal of Physics: Conference Series, 1564(1), 012009.

Ding, W., et al. (2018). Measurement of Angular Motion Accuracy for a 6-DOF Motion Platform. Journal of Physics: Conference Series, 1044(1), 012043.