An Equivalent Method to Evaluate the Vibration Control Effect due to Blocking Mass Added to Complicated Structures

The vibration control effect due to blocking mass on vibration transmission of single force excited structure is analyzed by adopting mechanical impedance method. Take the ring ribs cylindrical shell as research object, and simplify it as a mass-spring-damping system. The mechanical impedance of the whole structure is calculated by general commercial software MSC/NASTRAN, and then the vibration control effective and ineffective frequency band of any given mass was discussed. By comparing the vibration control effect calculated by general commercial software (finite element method) and mechanical impedance method, it is proved that mechanical impedance method is effective in analyzing the vibration control effect due to blocking mass.