NASSER M. A.
Yanbu Industrial College (YIC), Royal Commission for Jubail and Yanbu,
P.O. Box 30426 Madinat Yanbu Al Sinaiyah, KSA.
Production Engineering & Mechanical Design Department, Faculty of Engineering, Menoufia
University, Shebin El Kom, Egypt.
This paper aims to introduce a new adaptive design of vibration control systems. A Tunable
Stiffness Damper (TSD), stepper motor moving on an elastic element, is used as a wide
frequency range vibration controller. It can track and suppress only one target frequency of
the vibrating system within its frequency range. Modeling, simulation and tests are used to
check the proposed design under different excitation methods. Matlab was used in the
simulation process in frequency, modal and time domains of the structure with and without
the proposed design. Impact, sinusoidal and step relaxation excitation methods were used in
the experimental study of the proposed design. A control program was written and control
circuit was built and implemented to control the motion of TSD. Numerical simulations and
experimental results illustrate the success of the controller. In this design, the measurement of
the damping force and torques is not required, it is also highly possible to maintain the sliding
modes and achieve a high robustness against structure model uncertainties and disturbances
along with an ability to control biaxial excitation, clearly demonstrating its advantages for
vibration control of multi-degree-of-freedom (MDOF) structures.