Test modeling and parameter identification of a gun magnetorheological recoil damper

Since its performance requirements of gun recoil mechanism have been continuously increased, this paper was explored and aimed at its dynamic model and parameter identification of a new type of gun magnetorheological recoil damper. Combining with its recoil resistance rule and stroke requirements of the 37mm caliber gun, a long-stroke magnetorheological recoil damper was developed. Using the developed hardware-in-the-loop simulation platform for weapon system under impact load excitation, impact tests for the special designed long-stroke magnetorheological recoil damper were done and its dynamic performances under different impact loads and input current were examined. Two nonlinear testing models based on Bingham model and Herschel-Bulkley model were respectively established, index parameters of the MR fluid and other structural parameters in these models were also identified using the least square algorithm. Finally, the validity of test models and identification parameters were verified. The experimental results indicated that the designed large-scale single-ended MR recoil damper under 16000N impact load could reduce off 40% its recoil displacement and pressure peak value, and its adjustability of the damping force of MR dampers could be well applied for gun recoil mechanism impact resistance design.