PASSIVE AND ACTIVE VIBRATION CONTROL IN A MICROGRAVITY ENVIRONMENT: A SENSITIVITY ANALYSIS

摘要

In this study, passive and active vibration control methodologies for equipment and their light secondary attachments in large space structures under orbital excitations are considered. The equipment is modeled as a shear beam and its secondary attachment is treated as a single-degree-of-freedom lumped mass system. Vibration control mechanisms considered are pure friction, spring-damper, resilient friction and active friction control. Sensitivity analyses with respect to variations in the properities of the base isolation systems, the structure, and the intensity of the orbital excitations are performed. System parameters of the isolation systems are chosen to provide significant reduction in the transmitted vibrations. However, due to variations in the mechanical properties during manufacturing and fabrication, the prototype system properties may be somewhat different from the designed condition. Therefore, the effects of small variations in the design parameters on system performance are examined. The results show that the vibration control devices are insensitive to small variations of parameters near their design conditions.