Abstract
Tuned mass dampers (TMD) have been widely used in passive vibration control, but their main disadvantage is that the vibration reduction effect may be greatly affected by the natural frequency of the main structure. In order to solve this limitation, we designed a frequency adjustable tuned mass damper (FATMD) based on a magneto rheological elastomer (MRE), which is a new type of magneto rheological smart material, with adjustable stiffness, obtained by changing the magnetic induction. We used MRE to change the stiffness of FATMD to track the natural frequency of the main structure. However, adding TMD will change the natural frequency of the system. Therefore, we combined Hilbert–Huang transform (HHT) and a natural excitation technique (NExT), with Simulink/dSPACE, to identify the natural frequency of the system in real time, and then calculated the natural frequency of the main structure through the TMD optimal design theory. This can help adjust FATMD to its optimum tuning state. To verify the applicability and effectiveness of FATMD, this paper compares the FATMD and traditional TMD experimental results. The natural frequency of steel beams can be changed by adding mass blocks. The experimental results indicate that FATMD, using the frequency tracking method, can effectively track the natural frequency of the main structure to ensure that the system is always in the optimum tuning state. In addition, FATMD can still achieve a good vibration reduction effect when the natural frequency of the main structure changes.
Highlights
The tuned mass damper (TMD) is composed of a mass, a stiffness element and a damping element, which can absorb the vibration energy of the main structure through its own vibration, to reduce the vibration response of the main structure
empirical mode decomposition (EMD) decomposes the signal into intrinsic mode function (IMF), based on the time-scale characteristics of the data and uses the cross-correlation function between the two points of the structure under stationary random vibration signal excitation, to replace the impulse response function [54], so that the real-time natural frequency of the system can be determined
It can be seen that the identified natural frequency is accurate, which confirms that the proposed real-time frequency tracking method is applicable and can be used to calculate the natural frequency of the main structure
Summary
The tuned mass damper (TMD) is composed of a mass, a stiffness element and a damping element, which can absorb the vibration energy of the main structure through its own vibration, to reduce the vibration response of the main structure. The natura cation method is easy to implement, doesthe notTMD need to select the window function and is suitable for random load excitation, but the identified instantaneous frequency is the frequency of the system is converted into the natural frequency of the main structure, and natural frequency of the main structure-FATMD system, rather than the natural frequency the signal is segmented to realize the real-time refresh of the natural frequency of the main of the main structure itself To solve this problem, we improved the frequency identification structure. FATMD can main structure track the natural frequency of the main structure in real time to ensure that the FATMD vibration reduction is always kept in anAdjustable optimal tuning state.Mass Damper (FATMD)
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