An Improved Human Biodynamic Model Considering the Interaction between Feet and Ground

Abstract

Nowadays, studying the human body response in a seated position has attracted a lot of attention as environmental vibrations are transferred to the human body through floor and seat. This research has constructed a multi-body biodynamic human model with 17 degrees of freedom (DOF), including the backrest support and the interaction between feet and ground. Three types of human biodynamic models are taken into consideration: the first model doesn't include the interaction between the feet and floor, the second considers the feet and floor interaction by using a high stiffness spring, the third one includes the interaction by using a soft spring. Based on the whole vehicle model, the excitation to human body through feet and back can be obtained by ride simulation. The simulation results indicate that the interaction between feet and ground exerts non-negligible effect upon the performance of the whole body vibration by comparing the three cases.

Research on gear crack diagnosis of the planet gear transmission

“…Huang ZC and Zhang JF used a blind deconvolution algorithm based on kurtosis (Kr) maximisation to extract and enhance the impulse impact from the signal caused by the bearing's internal and external fault [10]. Feng ZP used the pursuit method to process the experimental data and extract the periodic impulse impingement of gear's local fault for identification about the pitting defect [11, 12]. The spectral correlation density and demodulation are used to extract the characteristic parameters for bearing fault diagnosis and gear fault [12, 13–20].…”

Dynamic analysis on the whole body with sitting posture for impact loading

“…Zhang et al . [11] used the twenty‐three degree of freedom linear bilateral dynamic model for the vehicle simulation by using ADAMS.…”