Comparative Implementations of a DSP -Based Two-Axial Electrohydraulic Fatigue Testing Rig

• Main Authors: Wei-hsiung Tso, 左維雄
• Other Authors: Ying-tsai Wang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/33697633414381375862

碩士 === 國立臺灣科技大學 === 機械工程系 === 96 === In this paper, a double-axial fatigue testing machine is setup by two sets of single-axial electrohydraulic subsystems controlled by digital signal processors individually. The fatigue tested equipment is a beam-type structure. Then, via the internet, the testing data could be real-time displayed in a remote monitor. This system is basically a nonlinear coupled TITO system. By treating this system as a decoupled system, each subsystem has significant structure interactions, parametric uncertainties and nonlinearities. To compare with other control algorithms, the fuzzy control is the best option for this unpredictable system. Then, in order to associate fuzzy rules with two-dimensional into one-dimensional, so this paper based on sliding mode fuzzy control, associated the self-organizing controller and adaptive self-organizing controller are third developed and implemented in this system. Then, these fatigue experi -ments of variety structures are performed at different frequencies. The magnitude error and phase lag ratio is defined to evaluate and compare their fatigue testing performances. Via plenty tests, the experimental results indicate that these three controllers can achieve the desired control objective precisely in the low frequencies. However, near to the structure resonance and in the high frequencies, magnitude error ratios of SMFC are significant, and magnitude error ratios of ASOSMFC is best than SMFC and SOSMFC.