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Abstract

A vibration isolation system is provided. The vibration isolation system includes a negative stiffness device which is additionally installed in the vibration isolation system which includes a main spring which is connected between a first object (mass) and a second object (a support) to isolate vibrations transmitted between the first and second objects due to a relative motion between the first and second objects. The negative stiffness device is disposed parallel with a main spring installed between the first and second objects to be installed in a direction which forms a right angle with directions of the relative motions of the first and second objects. Therefore, the negative stiffness device maintains stiffness of the main spring and lowers a change rate of potential energy of the vibration isolation system with respect to a displacement of the vibration isolation system, thereby increasing a vibration isolation effect. Since the negative stiffness device includes a linear auxiliary spring and a link, a structure of the negative stiffness device is simplified to be easily installed in the vibration isolation system and to be manufactured at very low cost. A natural frequency of the vibration isolation system is maintained at a lowest value (between 0 Hz and 1 Hz) to effectively isolate shocks or vibrations transmitted to the first and second objects. Therefore, the vibration isolation system provides a stable and comfortable feeling to a driver or a passenger of a vehicle or maintains a detailed precision degree of a machine system.

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