はかり用の-体型平行ばね機構の変位特性(第2報)

寸法誤差がある真直板ばねの場合

抄録

Based on the experiments, the beam theory and FEM, followings are clarified in this report. (1) The ideal point of the movement with error of dimension does not deviate from the middle point of two springs as long as two springs are symmetric regarding to y-axis passing through the middle point. Strict analysis, however, gives a small amount of deviation. (2) The error rate of displacement at the ideal point can be written as (3/2)(Δl/l₀-Δt/t₀), using two error rates of dimension in length and thickness, Δl/l₀ and Δt/t₀. This means that the error of dimension causes the error rate of displacement, or error of mass to be measured by using the movement as balance, independent of loading and measuring position s and x. There exists no error rate of displacement if the movement is adjusted so that Δl/l₀ is equal to Δt/t₀.