RESEARCH AND APPLICATIONS IN SHOCK LOADS ON STEEL WIRE ROPES IN HOIST SYSTEM

摘要

The ability to develop a rescue hoist load attenuator and to absorb mechanical impact energy while limiting the applied tensile load on the wire rope is expected to prevent catastrophic accidents and increase military aircraft capabilities. This paper considers the aspects related to cable properties under shock loads and the structure of the attenuator that was developed to minimize the damage to the cable and increase the durability of the hoist system. It subsequently reviews the specification, design and criteria used during evaluation and the process of qualification of the load attenuator. The instrumentation used to investigate the physical properties of the wire rope and the interaction with the attenuator is also presented. Basically steel wire rope cables are not constructed to withstand impact loads. The effect of impact loads on cables can't be ignored and the practical experience shows that the endurance is being reduced drastically. In many cases the shock loads that are being created during hoist system operation cannot be ignored and should be controlled and accounted for in determining the policy of maintaining safe operation of the system.