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(一)前言双曲线函数的悬链线理论和代数函数的抛物线理论,是集材架空索道承载索张力计算的两种基础理论,通常使用的是由简单的抛物线理论诱导出的代数式。对于后一种理论,在林业劳动灾害防止协会于一九六六年发行的“集运材架空索道技工课本”中有详细的论述。可是,在实际的计算中,为了准确地求出承载索的安全系数,必须对钢索的伸长和支点位移的变化进行相应的修正计算。在上述的课本里,介绍了两种关于修正计算的方法,也就是“新的计算方法”和“旧的计算方法”。
(I) Preface The theory of catenary of hyperbolic function and the parabola theory of algebraic function are the two basic theories of cable tension calculation of skid ropeway. Algebraic formulas induced by simple parabolic theory are usually used. For the latter theory, a detailed discussion is made in the “Skidding Tramway Skill Book for Settlements” published by the Association for Prevention of Labor Disasters in 1966. However, in actual calculation, in order to accurately find the safety factor of the load cable, the elongation of the cable and the change of the fulcrum displacement must be calculated and corrected accordingly. In the above textbook, two methods for correcting calculations are introduced, namely “new calculation method” and “old calculation method”.