Belt tension measuring apparatus

摘要

Apparatus and method for measuring a tension of a belt in a state spanned between pulleys under tension. Vibration is applied to the belt with a frequency varying within a predetermined frequency range including a resonance vibration frequency of the belt. Amplitude of vibration of the belt is detected to thereby output a corresponding amplitude signal. Occurrence of resonance of the belt is determined on the basis of a steep change of the amplitude signal. The vibration frequency of the belt detected upon occurrence of the resonance is identified as a resonance vibration frequency of the belt. Tension of the belt is determined on the basis of the resonance vibration frequency.