微小ばね-質量系の減衰特性に関する研究

抄録

In this study, a very small mass-spring system was constructed and its damping characteristic was studied experimentally. In the field of dynamics, the dominant theory will change depending on the size of an object. The mathematical model relevant to the motion of an object is called Newtonian dynamics, but it is only an approximation. Even in the case the size is not so small as governed by quantum mechanics, the influence of inertia, viscous force, or electro-static force will change when a dynamic system is miniaturized. Therefore, it is necessary to estimate these dynamic effects quantitatively to treat a very small physical system as represented by micro-machine. In this paper, a small mass-spring system was constructed and the free vibration experiment in the vacuum chamber was conducted to clarify its damping properties. The diameter of wire of the coil spring was around 20 μm, and the diameter of coil spring was around 400 μm. As a result, it was revealed experimentally that the air resistance is too large to ignore in micro scale.