Research on vibration isolation scheme and transmission characteristics of double motor propulsion shafting
At present,the vibration isolation treatment for electric propulsion equipment of large surface ships is relat-ively rare.In order to study the vertical transmission characteristics and vibration isolation scheme of a large ship's double motor propulsion shafting under propeller excitation,this paper proposes a finite element hybrid model construction method considering bearing damping effect,and gives six vibration isolation schemes.Taking the average vibration level drop as the evaluation criterion,the feasibility of the scheme is verified,and the conclusion is drawn:when the excitation force fre-quency is √2 times larger than the natural frequency of the system,the vibration isolation performance is stronger with the total static stiffness in a certain range.When the total static stiffness is equal,using a single vibration isolator with greater static stiffness and fewer numbers can achieve almost the same vibration isolation effect.The deformation of the dominant mode of the shafting is concentrated in the position of the front and back ends of the unit shaft,increasing the number of vi-bration isolators in this position can improve the vibration isolation performance.
large equipmentdouble motortransverse vibrationvibration isolationfinite element analysis
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