Dynamic performance of Magneto-Rheological dampers subject to impact load
Since Magneto-Rheological(MR)Dampers for gun recoil mechanism applications experience impact load,high velocities,the impact test for the designed long-stroke MR damper was done and the dynamic performance of the MR damper was examined,as well as the controllability of its damping force.By means of curve fit to experimental results,it’s shown that for recoil application,the steady flow equations for parallel plates based on the non-linear shear thickening Herschel-Bulkley fluid model are able to accurately describe the dynamic behavior of MR fluids subject to high shear rates and high flow velocities,at the falling stage of the recoil velocities.It’s followed that fluid index parameters and other parameters in this MR damper model were identified with the theory of nonlinear least squares.Since the mathematical expression of the model mentioned above is complicated and has different forms in high and low recoil velocities respectively,which is not benefit for real-time control,a simplified model with uniform mathematical expression was put forward.Finally,the magnitude of the impact load of this test was identified by energy spectrum analysis,and also the recoil process was numerically simulated.The results verified the validity of the simplified model and the correctness of its parameter identification.
Magneto-rheological dampers Impact load High shear rates Parameter identification Numerical simulation
Lijie Zhang Jiong Wang Linfang Qian
Department of mechanical engineering,Nanjing University of science and technology,Nanjing,China
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）