Abstract
To design a high speed sealed contacts, time durations of contacting noises are analyzed. The reed is replaced by two one-degree-of-freedom vibration systems. In the model, one mass collides and another vibrates with dynamic friction between contacts. Time duration of noises caused by rebounding, TA, is determined by coefficient of collision and parameter KA, defined as KA=ξ/ξ0ωA; velocity of collision ξ, angular frequency of vibration system ωA, and equivalent pressing distance ξ0. TA increases continuously with an increase of KA. Noises caused by free vibration, TB, is determined by equivalent friction coefficient between contacts and the parameter KA. TB increases in stair case with an increase of KA. Experimentally, in an unsymmetrical reed switch, noises are caused by rebounding and by free vibration. In a symmetrical reed switch, noises are caused by only free vibration. Each noise time duration agrees well with calculated values.
