Design of Cantilever Dynamic Vibration Absorber for Roof Fan
The cantilever dynamic vibration absorber is designed to eliminate residual vibration for the vibration isolated roof fan.First,based on the vibration isolated roof fan,the theoretical model of two degree of freedom vibration system is established,and the theoretical basis for the design of undamped dynamic vibration absorber is given.Then,based on the support a pair of cantile-ver dynamic vibration absorbers are designed symmetrically.The cantilever is located on the side of the support.It is made of Q235 steel and has threads.Meanwhile,its length is 400mm and its section diameter is 16.8mm.The steel counterweight is 2.81kg and has threads.In addition,it can be moved and fixed on the cantilever.The distance from the center of mass of the counterweight to the support is designed to be 333mm.The shield used to protect the absorber is fixed to the top of the support,and the lower end of the support is welded to the center of the hood of the roof fan.Last,when the cantilever works normally,its maximum stress is solved.Simultaneously,the maximum stress is compared with the ratio limit and yield limit of the cantilever material(Q235 steel).The results show that the cantilever not only works in the range of linear elastic deformation,but also fully meets the strength requirements.
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