STIFFNESS BEHAVIOUR OF POLYCAL WIRE ROPE ISOLATOR VIA FINITE ELEMENT ANALYSIS

Abstract

Vibration causes detrimental effects in daily applications such as camera mounting systems in drones i.e. jello-effects, distorted image and sensor accuracy deterioration. Hence, polycal Wire Rope Isolator (pWRI) is a passive isolation method proposed to overcome the vibration effects. However, the research being performed for pWRI is limited for vertical compressive static and monotonic loading case due to its complicated geometry and contact issues. In this research, the displacement loading-restoring force method was applied to investigate the stiffness behaviour of pWRI which studied the effects of thickness of joining plates, radius of curvature/bending radii, width to height ratio, and diameter of wire rope using ANSYS Static Structural Analysis and data source from ANSYS and literatures. The 3D CAD pWRI models were designed by CATIA v5 for the convenience of modelling in ANSYS. The results of the compression load-displacement behaviour followed a nonlinear pattern under compressive static loading and double linear retarding model under compressive monotonic loading. It was also found that, the stress and deformation distributions were similar for all the wire ropes in the isolator models. The deformation was more densely distributed near where the load was applied and subsided as it was away from load concentration. The effective stiffnesses were also ranked for each factors investigated based on respective isolator models. This research is unique in terms of the method used which is restoring force-displacement loading, proposed procedure of CAD modelling of polycal Wire Rope Isolator as there is no detailed research outlined which addresses the contact issue among wire ropes and extends the proposed data source for simulation in ANSYS.

Keywords

• displacement loading-restoring force
• nonlinear
• static
• monotonic
• double linear retarding model
• deformation