7.1.3. Building with TMD – both types of excitation Fig. 12 presents the curves describing the horizontal vibration of the highest storey (25th floor) of the building model with a TMD installed. The vibration was kinematically excited by both components of the ground motion acting simultaneously: – horizontal – modified Big Bear California seismogram, – vertical – zzðtÞ ¼ 0:0024 sinð2π1:92tÞ, where the value 1.92 Hz corresponds to the frequency exciting the main parametric resonance in the pendulum. The influence of the vertical component of the kinematic excitation on the pendulum vibration is also indirectly transferred to the vibration of the main system. Despite significant differences between a curve obtained from numerical calculations and a curve obtained through measurements [51], the extreme values of the vibration amplitudes remain in accord. It may be surmised that the differences stem from the imperfections of the real model, as was the case in the situation where harmonic signals were used.