Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore

Multi-Axis Synchronous Control of Pneumatic Cylinder for Reliability Tester

B. Sim, J. Y. Oh, W. J. Lee, S. J. Choi and W. Leea

School of Mechanical Engineering, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea


As most of the failures of machines or structures are called fatigue failures, reliability evaluation is one of the most important factors in design. Fatigue tester is a device that performs dynamic and static tests for material evaluation and product reliability evaluation. Most fatigue testers produce uniaxial weight due to mechanical limitations. Therefore, the test was conducted by applying three axes to each uniaxial load test. However, the actual load occurs simultaneously in the three-axis direction rather than the combination of individual load in the one-axis direction. In order to test real load, 3-axis simultaneous load test can make more realistic load. Multi-axis synchronous control is required to establish a load environment that occurs in multiple axes for a product. In addition, synchronous control allows multiple products to be tested at the same time to improve test efficiency. In this study, a controller for multi-axis synchronous control was developed. Due to the characteristics of the pneumatic system, there is a problem that the accuracy is very poor even if the control commands are synchronized. To solve this problem, the developed synchronous control algorithm compensates the phase of each axis by feedback-controlling the phase difference of each axis in real time. For displacement and load control based on feedback/feedforward, the synchronous control algorithm was applied. A user-based interface was created that allows the user to select and apply synchronous control to axes 2 to 4. The performance of the developed synchronous control algorithm was verified by conducting an experiment to control the position and load of each axis.

Keywords: Reliability tester, Pneumatic system control, Synchronized control, Proportional flow control

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