An Experimental Study for Collision Stimulus Device Using a Magneto-Spring

Abstract

Abstract An experimental device that utilizes a magneto-spring and collision forces for a single-degree-of-freedom stimulus is proposed. By way of an actuator, the experimental device that was created in order to test the response created by a magneto-spring stimulus force arising from an impact force, applies a displacement stimulus to the magnet on one side, changing the distance between the magnets as well as the faced surface area of the magnets. The moving mass that, which supports the loaded mass and the magnet on other side, provides kinetic energy via the actuator and the magneto-spring. When the moving mass impact on impact plate, the impact plate turn over the motion of direction. This collision stimulus device is composed of a mechanisms having low damping, and being vibration device using a magneto-spring, it was verified through analysis and experimental studies to be a highly efficient shaker mechanism. In addition, when the stimulus energy from the shock vibration experiment is low, due to loaded mass move a quasi-zero spring constant or a low magnetic field gradient, it is thought that by generating anti-phase and a large relative displacement from a low frequency, a highly efficient shock stimulus mechanism can be achieved, even by applying the momentary impulse input as a disturbance, the magneto-spring, constant of non-linear characteristics and strong spring constant, elastic energy is used to create a symmetrical triangular shock wave. On one hand, the relation between the inputs and outputs that use variations in the magnetostatic energy created by changes in the distance between the repulsed magnets and the faced surface area was verified by studying the amount of work created by the magneto-spring stimulus energy of a repulsed magnet system during one vibration cycle of the moving mass attached to a moving magnet and a fixed magnet. It is seen that the input/output energy characteristics of the magneto-spring stimulus force are a highly efficient mechanism due to mageto-spring move in a strong magnetic field gradient. However, it is seen that mechanical amplification mechanism that utilizes a magneto-spring and collision forces are a highly efficient mechanism due to mageto-spring move in a low magnetic field gradient. The collision stimulus device using a quasi-zero spring constant and a elastic energy of magneto-spring changes sinusoidal wave, that vibration device applies, into a symmetrical triangular shock wave found in a large collision force and amplified amplitude, due to external disturbance which acts as a trigger, a elastic energy of magneto-spring and distance between impact plates optimized. However, it was realized that when a force greater than the prescribed amount is applied as resistance. As a results, the vibration energy is diminished, a shock wave change a symmetrical sinusoidal wave due to loaded mass move in a low magnetic field gradient or a quasi-zero spring constant.