This paper presents a new variable stiffness control system, which can switch the stiffness continuously and smoothly. the new and innovative semi-active variable stiffness control (SAIVS) device and tests performed to study the effectiveness of the device are presented. A new control algorithm based on instantaneous frequency estimation using Hilbert transform is developed and implemented in real time digital signal processing system and controller. Shake table test results of a single degree of freedom system with SAIVS device is presented.
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