琴弦振动理论在工程中柔索求拉力的应用

APPLICATION OF THE CHORD VIBRATION THEORY TO SOLVE THE TENSILE FORCE OF FLEXIBLE CABLE IN ENGINEERING

琴弦横向振动时 ,振动固有频率主要与三个因素有关 ;张紧力 ;弦密度 ;弦长。它的逆问题 ,柔索的张紧力与索的密度、索横向振动的固有频率、索的长度有关 ,应用这个理论可以对大型斜拉桥的索力、体育馆的吊索力以及特大型水坝的起吊闸门的索力等进行检测 ,并可以识别吊索故障。本文提供理论及应用技术 。

When the chord is transversely vibrating,its natural frequency is related to the strain,density and length.Accordinly,the strain of flexible cable lies in its density,length and natural frequency of transversal vibration.As for many flexible cables in engineering,for example,the long-span cable-stayed bridges,sport stadiums and the hoist-type strobe of the dams etc,the tensile force in the cables can be solved and the failure can be thus detected.In the paper,the theory and technique are discussed and the error control of the method is also alluded.