Modeling and Design of Net ZEBs as Integrated Energy Systems - Modeling, Design, and Optimization of Net-Zero Energy Buildings - page 43

Fig. 2.8 Transfer function plots (magnitude and phase) for Z 11 , carpeted
floor (fitted fourth order transfer functions also shown) (Figure courtesy of
Ali Saberi Derakhtenjani)
Fig. 2.9 Transfer function plots (magnitude and phase) for Z 17 , concrete
floor (fitted fourth order transfer functions also shown) (Figure courtesy of
Ali Saberi Derakhtenjani)
An example of a fourth order fitted function for Z 17 obtained with the above
technique is given in Figure 2.9 . As can be seen, this fit is good in both
magnitude and phase, the error being less than 2% in the frequency range of
interest. The fitted Laplace transfer function for Z 17 is: