## 4 Experimental Setup  
### Experimental Model  
To evaluate the performance of the TMD damping scheme, a structural model of the PSPP building was designed and fabricated and a series of tests was conducted. The experiment studied the mechanism of structure-TMD synergistic damping under high-frequency vibration and evaluated the control performance of the TMD device. Therefore, the experimental model was not limited to strict similarity in terms of the structural form and transmission path; the main objective was to investigate the damping performance of the structure-TMD system at high frequency. The experimental model can be regarded as a microcreduced prototype that is similar to the upper frame structure of a PSPP. The vibrational response of the structure to high frequency was measured and the result was used to analyze the control effects of various TMD schemes. Based on the vibration reduction performance during the steel frame test, the feasibility of using TMDs to control the vibration of a hydropower station building was analyzed. In addition, the hydraulic vibration source was transmitted to the  
Figure 2: High-frequency TMD vibration control method for structures of a pumped storage power plant (PSPP).  
superstructure through the solute and the overall vibration of the structure was still excited. Therefore, the transmission path of the vibration source was not strictly simulated. Only the superstructure was studied and the overall vibrational response to the structure's high-frequency resonance was investigated. The vibration of the superstructure was mainly transmitted to the floor of the generator of the support structure. Therefore, the energy dissipation in the vibration transfer process through the control column could suppress the floor vibration. A shaking table was used as an excitation source to simulate high-frequency excitation similar to the pressure water pulsation frequency component, and the structural vibrational response was analyzed with and without TMDs. The control method of structural high-frequency vibration can be well understood through the test, which can be used as a reference for vibration control of a PSPP powerhouse structure.  
In this experiment, a steel frame model was designed. The model was 0.8 m tall and the total mass was 57.6 kg. The test model nodes were connected by welding. First, a finite element analysis model of the test model was established and an analysis was performed to obtain the theoretical values of the modal parameters. The analysis results demonstrate that the second-order mode of the structure in the X-direction did not differ substantially from the tail pressure water pulsation frequency that was observed in [34]; hence, the tuning frequency of the structure was determined to be the second-order mode. The first four modes of the model structure were X-direction translation, Y-direction translation, and X-direction translational vibration. Therefore, the second-order mode was X-direction horizontal translational vibration, and the vibration part was mainly located at the top of the first and second layer. A typical structural floor plan and test models are shown in Figure 3. The geometry and material parameters of the test model are listed in Table 1.  
Figure 3: Test model information: (**a**) structural design and (**b**) experiment model.