## 6 Results and Discussion
### Discussion
#### 6.2.2 Influence of W\({}_{\rm V}\):W\({}_{\rm A}\) on the Control Performance of the ISAMD  
The timing of the \"Unlock\" and \"Lock\" switching of the ISAMD is dependent on the control law of the ISAMD and is regulated by the velocity and acceleration weight. For noncyclic near-fault and far-field ground motion loads, the shock absorption effect of the ISAMD under various weight ratios should be investigated. The results of analyzing six control performance indices of a building under control of the ISAMD with five different weight ratios and without auxiliary stiffness or a spring under excitation of 26 seismic loads are listed in Table 2. The results for the control performance indices J1-J6 are shown in Figures 16-20. Figure 16: The average maximum roof displacement ratio of the building with the ISAMD, J1. Figure 14: The maximal roof displacement ratio of the TMD with optimal _rf_ and ISAMD, \(\mathrm{W_{V}}\):\(\mathrm{W_{A}}=\omega_{0}:1,\mathrm{K}=0,\mathrm{C}=0\). Figure 15: RMS roof displacement ratio of the TMD with optimal _rf_ and ISAMD \(\mathrm{W_{V}}\):\(\mathrm{W_{A}}=\omega_{0}:1,\mathrm{K}=0,\mathrm{C}=0\). Figure 19: The standard deviation of the root mean square root displacement response ratio of the ISAMD, J4. Figure 17: The standard deviation of the maximum roof displacement response ratios of the ISAMD, J2. Figure 18: The average value of the root mean square root displacement responses of the ISAMD, J3. The minimum index of J1 was mostly within 0.65-0.67 for the ISAMD under all weight ratios, and the average seismic resistance ratios were 33-35% for the building with the ISAMD under excitation of 26 seismic records. The orange dotted line in Figure 16 shows that, when the ISAMD functions without consideration of acceleration responses (V0A1), the sensitivity of the control performance index J1 of the ISAMD to the frequency ratio (_rf_) is the highest weight ratio of the ISAMD. When the frequency ratio is greater than 2, the shock absorption effect is reduced. However, there is a large range of stiffness changes from the optimal frequency ratio, around 1.59-2. This is not a defect of design. Thus, if the weight of acceleration responses is only considered in J1, the value of J1 monotonically decreases with the frequency ratio. The frequency ratio should be very high to have the same shock absorption effect as other ratios. If it is too high, there will be other adverse reactions. Thus, adopting only the consideration of acceleration weight (V0A1) is not recommended. Figure 16 shows that the frequency ratio of 2-4 with a weight ratio of V1A0-V0A1 can achieve a stable shock absorption effect. When the standard deviation of the maximum roof displacement reaction ratio is low, the sensitivity of the control performance to the seismic wave is low and the shock absorption control is stabler. Figure 17 shows that, when the frequency ratio is lower than 1, the value of J2 is the minimum. When the frequency ratio is large, it can steadily fall by 0.2. The shock absorption ratio is about 34% for _rf_ = 2.0. The shock absorption effect of the ISAMD can be guaranteed. Figures 18 and 19 reveal that the root mean square roof displacement shock absorption effect of the ISAMD. The average shock absorption ratio is around 60%, and the standard deviation is also relatively small. Therefore, the ISAMD provides a fine damping effect. Figure 18 shows that, for the control effect of the ISAMD, the V1A0 weight ratio is slightly inferior to the other weight ratios. The control performance index of the ISAMD of acceleration responses behaves poorly. The acceleration reaction of the ISAMD with a frequency ratio interval of 2-4 and a better displacement control effect is basically larger than those of the bare structure. The reason is that the control force of the control mass block is close to the impact force when the frequency ratio is large. Therefore, the acceleration responses are amplified. Another disadvantage of the ISAMD is the displacement responses of the control mass block.