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Life Estimation of Hydro Spring Type Recoil System

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Design and development of weapon and ammunition systems for artillery requires among other things, a robust design for the recoil system. Being of utmost importance, reliability of the recoil system has to be studied. India is undertaking design of state-of-the-art artillery systems; hence Zeus undertook a study project to enhance its capabilities in the field. The objective was to re-assess the performance and life of a recoil system using the latest simulation tools and methodologies.

Zeus Numerix developed a system level dynamics code that solves for force balance on the recoil system. Thus, by accounting for hydraulic, spring, frictional and inertial forces, the run-out distance and transient load on the piston were calculated. The dynamics code was further improved by using the hydraulic resistance data as obtained from detailed CFD simulations. In this case, the hydraulic oil flowed through a severely constricted orifice of area ratios greater than 50:1. A transient stress analysis of the piston rod revealed zones with high stress concentrations. Finally, life of the recoil system, in terms of number of fires, was calculated using a stress life approach. The approach employed S-N curve for the material.

Stress concentration zones on piston rod

The generic system tool for numerical analysis for recoil systems has been developed. The simulation tool caters to various types of recoil systems for different types of guns. The tool can be readily used for design of recoil systems.

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