| CPC F16F 7/104 (2013.01) [F03D 13/20 (2016.05); F05B 2260/964 (2013.01); F16F 2222/08 (2013.01)] | 20 Claims | 

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               1. A tunable mass damping device, comprising: 
            a connecting rod extending in a longitudinal direction; 
                a weighted assembly connected at a lower end of the connecting rod; and 
                a top connecting assembly, which is connected between an upper end of the connecting rod and a tower beam of a tower, and includes an anti-rotation mechanism, the anti-rotation mechanism comprising: 
                a laterally extending fixing plate, which is fixedly connected to the tower beam through a longitudinally extending support member; 
                a laterally extending first movable plate, which is arranged under the fixing plate and fixedly connected with the upper end of the connecting rod; and 
                two connecting shafts spaced apart from each other, wherein each of said connecting shafts extends in the longitudinal direction, and has a lower end fixedly connected to the first movable plate, and an upper end inserted into the fixing plate and connected therewith through a connecting head, 
                wherein the connecting head includes an outer sleeve connected to the fixing plate, an inner sleeve arranged in the outer sleeve and connected to a respective one of the connecting shafts, and an intermediate elastic layer arranged between the inner sleeve and the outer sleeve. 
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