Numerical analysis of multiphysical field for independent three-stage magnetorheological damper of double rod during recoil process of artillery

Abstract

In order to investigate the multiphysics in the recoil process of magnetorheological damper, independent three-stage magnetorheological damper of double rod has been designed. The magnetorheological gel with carbonyl iron powder mass fraction of 70% (MRG-70) has been prepared and the steady-state shear test was carried out for obtaining the consistency coefficient k and the non-Newtonian index n of the Herschel–Bulkley model. MRG-70 has been applied to the damper and the motion analysis of the recoil part has been carried out by combining the law of chancing of the bore resultant force of a certain type of fixed artillery. Results of the theoretical analysis and numerical calculation of multiple physical fields for damper showed: (1) there was a scattered magnetic flux inside the damper. The magnetic field was generated by the combined coil with a high degree of nonlinearity and time variability; (2) the internal energy dissipation of damper comprises five parts, in which Poiseuille pressure flow loss and Couette viscous flow loss were the primary and controllable part of the damper. The temperature of each pole reaches a peak value, and it is different at different times; the pressure drop at the magnetic pole was less than the pressure drop at the coil; (3) the dynamic viscosity of the central axial surface of the effective damping channel shows obvious nonlinearity and time variability from the spatial and time dimension, and varies very sharply at each pole, and the peak value fluctuates with the position.

The Influence of the Temperature on the Dynamic Behaviors of Magnetorheological Gel

“…[ 6–11 ] Many of those MR devices are adopted to control vibration or shock absorption by consuming mechanical energy and convert it into the internal energy of MR materials. [ 12–15 ] Such dissipative work of the magnetorheological absorb system will heat the MR device and undoubtedly result in a temperature rise. Therefore, increasing the materials operating temperature will in turn affect the engineering applications of materials, such as the complexity of the control model and control accuracy.…”

Design and modeling of a magnetorheological damper with double annular damping gap

“…When current is applied, the damping force can be controlled by adjusting the magnitude of the current. As a vibration damping device for semi-active control, it is often used in aerospace (Atabay and Ozkol, 2014), weapons (Li et al, 2019; Zhang et al, 2019), automobile suspension (Tang et al, 2017), building vibration reduction (Zafarani et al, 2018), and other fields.…”

Experimental investigation on the influence of temperature on the hysteresis behavior of magnetorheological gel by employing a large-amplitude-oscillation-shear test method

“…As a novel type of smart MR material, MR gel has been investigated by the researchers in terms of rheological properties because of ideal controllable performance. 19 Zhang et al 20 studied the dynamic behaviors of MR gel with the various weight of carbonyl-iron-particle employing large-amplitude oscillation shearing measurement. The results described that the onset strain value from the linear region to the nonlinear viscoelastic area increases along with the weight of carbonyl-iron-particle.…”