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Non-linearity of magneto-spring and instability of float control have been used for establishing a new vibration isolator system, in which the polarity of the damping constant can be changed easily. The positive damping is independent of loaded mass, which is a very good characteristic for the suspension system compared with the current mechanical pairs composed of metal- or air-spring and a shock absorber. On the other hand, the negative damping can be used for the excitation device of the simplified construction, which leads to a decrease in cost and weight.

Several vibration-isolating equipments with metal spring, air spring, rubber spring, a shock absorber and a viscoelastic damper are developed by aiming at the optimum adjustments. The purpose of this paper is to study the new spring-mass system using non-linearity of magneto-spring and instability of float control. The dynamic spring constant and the damping coefficient of magneto-spring are dependent of a motion of amplitude. They are a much better characteristic for the suspension system compared with the current mechanical pairs composed of metal or air spring and a shock absorber. The vibration-isolating structure that combines the non-linear magneto-spring and the linear metal spring has the same effectiveness as a dynamic vibration reducer. For that reason, the suspension system using magneto-spring can reduce the vibration energy with a small stroke.