钢索悬挂在两支点时所呈现的索形状态,人们通常把它作为悬链线线形处理,并视此获得的索道有关量为精确值。 悬链线函数是超越函数,在实际应用中不如代数函数来得方便。为此,人们努力寻求较简便的代数函数法来取代悬链线。以往,习惯采用抛物线法来取代。目前,又出现了“悬索曲线”法和摄动法来取代。各法建立各自的条件,其可适用的范围,各文均已提出。而在同一条件下,各取代法可能达到精度和适用范围,并未作探讨。 When the cable is suspended at the two points, the shape of the cable is presented. The cable is usually treated as a catenary, and the cable-related quantity thus obtained is an accurate value. Catenary functions are transcendental functions, which are not as convenient as algebraic functions in practical applications. To this end, people strive to find more simple algebraic function method to replace the catenary. In the past, the habit of using the parabolic method to replace. At present, there have been “suspension curve” method and perturbation method to replace. Each law establishes its own conditions, its applicable scope, each text has been proposed. Under the same conditions, the replacement method may reach the accuracy and scope of application, not discussed.