Static lateral stiffness of wire rope isolators

Abstract

This paper presents an analytical model for the static lateral stiffness of Wire Rope Isolators (WRI). The wire rope isolator, which is a passive isolation device, has been widely adopted as a shock and vibration isolation for many types of equipment and lightweight structures. The major advantage of the WRI is its ability to provide isolation in all three planes and in any orientation. The WRI in the lateral roll mode, is required to possess the required lateral stiffness to support and isolate the equipment effectively. The static lateral stiffness of WRI depends mainly on the geometrical characteristics and wire rope properties. The model developed in this paper is validated experimentally using a series of monotonic loading tests. The flexural rigidity of the wire ropes, which is required in the model, was determined from the transverse bending test on several wire rope cables. It was observed that the lateral stiffness is significantly influenced by the wire rope diameter and height of the isolator. The proposed analytical model can be used for the evaluation of lateral stiffness and in the preliminary design of the WRI.

Quasi-static cyclic behavior of wire rope isolators: comprehensive experimental study and improved mathematical modeling

“…This hysteresis is a natural way, available in mechanical and structural systems, to provide restoring forces against movements and dissipate energy. Previous studies [ 3 , 4 , 6 , 7 , 8 , 9 ] have verified and confirmed that the WRI exhibits a hysteresis curve under cyclic loading and is due to the frictional resistance between the wire strands [ 10 ]. The studies [ 11 , 12 , 13 ] also shows that dry friction in the wire rope can cause energy dissipation.…”

“…The nonlinear elastic region is where the isolator behaves nonlinearly when subjected to large displacement amplitudes or when loaded in a specific direction. Many studies have observed this behavior [ 3 , 4 , 6 , 7 , 8 , 9 ].…”

Vibration isolation characteristics and control strategy of parallel air spring system for transportation under abnormal road and eccentric load conditions

“…An important characteristic of wire rope isolators is that it has the ability to isolate vibration in all directions, so it can be used in any direction to safeguard the structure and equipment. 8–10 However, it is difficult to satisfy various requirements of vibration isolation by adjusting the parameters of wire rope isolator.…”

Analysis of vibration isolation performance of parallel air spring system for precision equipment transportation

“…It can be mounted in any orientation to protect structures and equipment excited in any direction. 11 Therefore, it can isolate the vertical vibration and ensure the horizontal safety at the same time, and its intrinsic damping can dissipate the vibration energy greatly. However, the wire rope isolator is installed in the vibration isolation system located between the fixed device and the excitation, thus it is difficult to adjust it in real time to adapt to different vibration isolation requirements or transportation conditions.…”