Wire Rope Transmission Losses

Abstract

Transmission losses are determined for 20 wire ropes commonly used in crane and hoist practice. The apparatus and procedure used in determining the losses are described and the results are presented in the form of graphs. From these graphs the law governing the losses is established. The results of work done in Germany and Italy are used to show that the law holds for a large variety of rope types. These results allow conclusions to be drawn from tests on 81 ropes leading to the more specific form of the law. The losses are characterized by transmission loss coefficient K which is found to depend on type of rope construction, lay and finish. Values of K are given in Appendix I for a large variety of rope types.

The mean values of K are given for all bright steel ropes, for galvanized ropes, Lang lay ropes and for one-operation parallel laid ropes.

Using the mean value of K for all ropes a simplified form of the law is obtained. This simplified form will yield results which will probably be within 20 per cent of the actual losses for any type of rope.