{'fraction_non_alphanumeric': 0.026232948583420776, 'fraction_numerical': 0.002098635886673662, 'mean_word_length': 5.276315789473684, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 1, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Six degree-of-freedom active vibration control using the Stewart platforms

Multiple degree-of-freedom (DOF) vibration control systems are essential for precision control of a wide range of Space-borne structures as well as earth-based systems. This paper studies the design and control problems of a class of multiple DOF vibration isolation systems using the concept of a Stewart truss and Stewart platform mechanism. A novel geometric arrangement of a Stewart platform, called the "cubic configuration" is developed and used. A new design and analysis of actuators employing magnetostrictive material Terfenol-D is presented. Robust adaptive filter algorithms for active vibration control are formulated. Prototype hardware for a six degree-of-freedom active vibration isolation system with the "cubic configuration" of the Stewart platform has been implemented and tested. About 30 dB of vibration attenuation is achieved in real-time experiments. >