نوع مقاله : پژوهشی
نویسندگان
1 استاد دانشکده عمران-دانشگاه تبریز-تبریز- ایران
2 دانشکده عمران دانشگاه تبریز-تبریز-ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
In recent decades, the efficiency of various active control tools in improving the seismic performance of structures has been investigated. Active control systems are one of the structure control strategies that modify the dynamic characteristics of the structure to deal with the destructive effects of possible earthquakes and minimize the responses. The critical damping state for the structure is a condition in which the velocity and displacement of the structure are minimized. The active control system can establish this condition for the structure as a regulator. When the structure controlled by the active method is in the critical damping state, the feedback gain matrix depends only on the velocity. Therefore, the use of velocity sensors is sufficient. Since the critical damping condition is sensitive to changing the system characteristics, the purpose of this research is to investigate the uncertainties assuming the establishment of the critical damping state. A ten-story shear building with active tendons in all stories subjected to earthquake vibration is considered to model and investigate parameter uncertainties, sensor/actuator faults, and failure of actuators. The effect of mass, stiffness, and damping uncertainties is evaluated, the partial failure of various sensors/actuators is assessed and the importance of each actuators failure is illustrated. The results showed that the designed controller can provide a 100% damping ratio for all vibration modes. In other words, the poles of the system are placed on the left side and the real part. The results illustrate that the response of the controlled structure in the critically damped condition is more sensitive to mass uncertainty and less sensitive to damping. The investigation of the sensitivity of the controlled structure in the critically damped condition to sensor faults showed that increasing the nominal and marginal value of sensor faults leads to increasing in the displacement responses and control forces.
کلیدواژهها [English]
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