Sensitivity analysis of output damping force based on magnetorheological damper
                                        AN Chenliang1, MA Jinyu2, WANG Jiawei3, QUAN Lingxiao3
(1.Beijing Institute of space launch technology, Beijing 100076, China; 2.Beijing precision mechanical and electrical control equipment research institute, Beijing 100076, China; 3.Yanshan University,school of mechanical engineering, Qinhuangdao 066004, China)

Abstract: Aiming at the vibration control of the hydraulic pipe system, the semiactive vibration control of the hydraulic pipe was studied.A mathematical model of magnetorheological fluid output damping force was established by means of mechanism modeling for the sensitivity analysis of MR fluid design parameters. Aiming at 10 design parameters related to the structure and characteristics of MR damper, the first and the secondorder output sensitivity equations were established, and the firstorder and secondorder output sensitivity function expressions were obtained.Based on Matlab software, the corresponding firstorder and secondorder output sensitivity functions were solved,the influence degree of each parameter variation on the dynamic characteristics of the system was analyzed. The results indicate that when the parameters change by 10%, combining two sensitivity indexes, the three design parameters of the excitation coil turns, the core crosssectional area and the gap between the outer cylinder and the piston cylinder cause the maximum percentage change of the output damping force.

Key words: vibration control; magnetorheological (MRF) damper; sensitivity analysis; sensitivity equation