In the process of wind energy utilization, building structure and large-scale mechanical equipment operation, complex wind load often brings multi-directional and multi-frequency vibration problems. With the increase of equipment size and structural flexibility, the traditional single vibration reduction method has been difficult to meet the demand. How to achieve better vibration reduction effect under complex wind load has become the core topic of industry concern.

First, the characteristics of complex wind load

Multi-directional superposition: natural wind has the characteristics of randomness and turbulence, and horizontal and vertical winds are superimposed on each other to form multi-dimensional loads.

Frequent pulsation: the instantaneous fluctuation of wind speed is frequent, which leads to unstable impact on structures and components.

The coupling effect is obvious: in the case of high wind speed or changeable wind direction, the coupling between the natural vibration mode of the structure and the external force frequency is more likely to occur.

Second, the limitations of traditional vibration reduction methods

Simply strengthening the structure: although the deformation can be reduced by improving the stiffness, the cost is increased and the effect on high-frequency vibration is limited.

Ordinary damping materials: the effect is not balanced under multi-frequency excitation, and often only works for a certain frequency band.

Balance adjustment: Although moment of force can be reduced in rotating machinery, there are still shortcomings in the randomness of wind load.