Here,　aiming　at　problems　of　single　frequency,　multi　frequency　and　stiffness　and　damping　exceeding　allowed　ränge　faced　by　applications　of　magnetorheological　Vibration　absorber　in　longitudinal　Vibration　control　of　propulsion　shafting,　a　semi-aetive　control　method　based　on　variable　stiffness　and　variable　damping　magnetorheological　Vibration　absorber　was　proposed　to　realize　frequency　synchronization　and　damping　optimization,　and　broaden　Vibration　reduction　bandwidth　of　propulsion　shafting.　Firstly,　the　propulsion　shafting-magnetorheological　Vibration　absorber　coupled　model　was　constructed　and　its　dynamic　equations　were　established　to　analyze　longitudinal　Vibration　characteristics　of　propulsion　shafting.　Then,　taking　stiffness　and　damping　optimal　control　criterion　as　the　constraint　and　displacement　zero-tracking　of　the　controlled　object　as　the　control　objective,　an　integral　sliding　mode　Controller　was　designed,　and　Lyapunov　stability　analysis　was　performed.　Furthermore,　Vibration　control　Simulation　was　performed　for　propulsion　shafting　to　analyze　the　semi-active　Vibration　absorption　effect,　and　verify　the　effectiveness　of　integral　sliding　mode　control.　Finally,　an　experimental　platform　was　built　to　conduct　scaled-down　Vibration　absorption　experiments.　Experiments　showed　that　this　Vibration　absorption　method　can　make　propulsion　shafting　quickly　reach　its　steady　State　under　different　operating　conditions,　and　effectively　reduce　the　Vibration　acceleration　level　within　propulsion　shafting　excitation　frequency　ränge　of　6.　0　-30.　0　Hz　transmitted　to　thrust　bearing　base;　This　new　Vibration　absorption　method　can　not　only　be　expected　to　break　through　the　bottleneck　of　propulsion　shafting　Vibration　reduction　under　variable　working　conditions,　but　also　enrich　the　theoretical　basis　of　Vibration　control　field　and　provide　common　theoretical　guidance　for　similar　Vibration　absorption　problems.　©　2025　Chinese　Vibration　Engineering　Society.　All　rights　reserved.