This work introduces a new concept for controlling the mechanical vibrations via variable stiffness coil spring. The concept relies on fitting a screw though the spring to change the number of active spring coils. A prototype has been built and tested with promising results toward an innovation in the field of vibration control.
 D. J. Inman, Engineering Vibrations. Prentice Hall, 2007.
 B. C. Nakra, "Vibration Control in Machines and Structures Using Viscoelastic Damping”, Journal of Sound and Vibration, Vol. 211(3), 1998, pp. 449-466.
 C. R. Fuller, S. Elliott, P. A. Nelson, Active Control of Vibration. Academic Press, 1997.
 S. Nagarajaiah, S. Ertan, "Structures with Semiactive Variable Stiffness Single/Multiple Tuned Mass Dampers”, Journal of Structural Engineering, Vol. 133(1), 2007, pp. 67-77.
 T. Kobori, M. Takahashi, T. Nasu, N. Niwa, K. Ogasawara "Seismic Response Controlled Structure with Active Variable Stiffness System”, Earthquake Engineering and Structural Dynamics, vol. 22, 1993, pp. 925–941.
 J. A. Aardema, Variable Stiffness Spring Suspension, US Patent No. 4,832,321, 1989.