Fig. 1

Framework of the proposed HFBVI for heavy-duty truck seats (color online)"

Fig. 2

Description of the simplified model: (a) the resonant frequencies of human organs and spines and the human body seat model of the HFBVI; (b) the 3D model of the HFBVI (color online)"

Fig. 3

2D structure diagram of HFBVI: (a) at the initial position under empty load; (b) at the equilibrium position under the ideal load M and the other positions under the disturbance (color online)"

Fig. 4

Quasi-static test setup: (a) the HFBVI installed on the computerized spring testing machine (HYZ-TH-A100A); (b) the vibration isolation platform (equivalent to load) balancing the 10 N restoring force (color online)"

Table 1

Initial parameters of the prototype"

Table 2

Parameters of spring performance"

Fig. 5

Theoretical and experimental restoring force-displacement curves of the HFBVI, where the rectangular dashed region represents the QZS working region (color online)"

Fig. 6

Simplified model and force diagram of the HFBVI: (a) force excitation of F=F0cos (ω t); (b) displacement excitation of Y=Y0cos (ω t) (color online)"

Fig. 7

Transmissibility curves for different pre-stretching amounts: (a) and (b) force transmissibility, where λ=0.75, ξ=0.05, and ${\bar F}$=0.01; (c) and (d) displacement transmissibility, where λ =0.75, ξ=0.05, and ${\bar Y}$=0.03. Additionally, for a detailed analysis of the performance of the HFBVI, this subsection employs the LVI as a reference. Two VIP indices are defined as the relative initial isolation frequency (RIIF) and the relative peak transmissibility (RPT). The ratio of the HFBVI vibration isolation index is also calculated (color online)"

Fig. 8

Experimental setup of the dynamic test of the HFBVI under harmonic excitation: (a) components of the experimental prototype; (b) experimental procedure (color online)"

Table 3

Initial parameters of the ideal load prototype"

Fig. 9

Experimental results: (a) isolation coefficients of the LVI and HFBVI under periodic excitation with equal voltage; (b) transmissibility of the LVI and HFBVI in the human-sensitive frequency band (color online)"

Fig. 10

0Analysis results: (a) time-domain response of acceleration; (b) PSD of acceleration (color online)"

Fig. 11

Vibration experiment under real random road spectrum excitation: (a) experimental scenario; (b) acceleration sensor installation, where the installation location has been hollowed out (color online)"

Fig. 12

Experimental results for real random road spectrum excitation: (a) time-domain response of acceleration; (b) RMS values of acceleration response; (c) PSD of acceleration, where the rectangular dashed region represents that the HFBVI has entered the effective vibration isolation region; (d) localized amplification of (c) (color online)"