During the operation of fans, steam turbines and large rotating machinery, blade vibration control has always been the focus of the industry. With the continuous increase of equipment capacity and speed, the superposition of aerodynamic load and structural stress makes the blades more prone to vibration problems. Improper vibration control will not only affect the efficiency, but also shorten the service life of the equipment. The appearance of Tuned Mass Damper (TMD) brings a new optimization idea for blade vibration control.

First, the causes and challenges of blade vibration

Aerodynamic load fluctuation: the wind speed, airflow direction and pressure fluctuate unevenly, resulting in unbalanced blade force.

Resonance risk: When the working frequency of the blade is close to its natural frequency, the vibration amplitude is significantly enlarged.

Structural flexibility is enhanced: under the trend of lightweight design, the structural stiffness of blades is reduced and it is more susceptible to dynamic excitation.

Second, the limitations of traditional vibration control methods

Simple reinforcement: Controlling vibration by increasing blade thickness or stiffness will lead to increased weight and reduced efficiency.

Passive damping material: under high frequency or multi-frequency excitation, the effect is limited.

Balance adjustment: Although moment of force can be improved, it is difficult to cope with complex aerodynamic conditions.

Third, the working principle of tuned mass damper

Tuned mass damper is a device that attaches a specific mass, spring and damping element to the main structure. By adjusting its natural frequency to make it close to the natural frequency of the blade, it will generate a reverse force during vibration and offset part of the vibration energy of the main structure. Its core points are as follows:

Frequency tuning: accurately match the characteristic frequency of blade vibration.

Energy dissipation: vibration energy is converted into heat energy or dissipated in other forms through damping elements.