Experimental investigation of biodynamic human body models subjected to whole-body vibration during a vehicle ride

Abstract

In this study, responses of biodynamic human body models to whole-body vibration during a vehicle ride were investigated. Accelerations were acquired from three different body parts, such as the head, upper torso and lower torso, of 10 seated passengers during a car ride while two different road conditions were considered. The same multipurpose vehicle was used during all experiments. Additionally, by two widely used biodynamic models in the literature, a set of simulations were run to obtain theoretical accelerations of the models and were compared with those obtained experimentally. To sustain a quantified comparison between experimental and theoretical approaches, the root mean square acceleration and acceleration spectral density were calculated. Time and frequency responses of the models demonstrated that neither of the models showed the best prediction performance of the human body behaviour in all cases, indicating that further models are required for better prediction of the human body responses.

Health effects associated with occupational exposure to hand-arm or whole body vibration

“…Computational models have been developed to examine the effects of the various mechanical forces of hand-transmitted vibration on the development of and back pain and injury in workers exposed to WBV. These models have included variables to examine the effects of vibration and mechanical stressors, including load, mass and posture on the hips, spine and intervertebral disks with exposure to WBV (Zhang, Qiu,Griffin 2015; Wang et al 2010; Taskin et al 2018), and grip strength, vibration frequency and amplitude in workers exposed to HTV (Wu et al 2006; Wu et al 2007; Wu et al 2008). The published computational models are consistent with data collected in humans showing that the resonant frequency of the human body is between 5–10 Hz (Zeeman et al 2015; Matsumoto,Griffin 2002; Qiu,Griffin 2010; Basri,Griffin 2011), and that the resonant frequency of the human hand-arm system is between 100–300 Hz depending on the location of the measurement (Dong, Welcome, et al 2004; Dong, Welcome,Wu 2005; Dong et al 2006; Wu et al 2007; Wu et al 2008).…”

<p>Physiological Vibration Acceleration (Phybrata) Sensor Assessment of Multi-System Physiological Impairments and Sensory Reweighting Following Concussion</p>

“…[10][11][12] Vibrational analysis is a key component of digital twin models used to monitor the health of complex industrial systems, 13 and this concept has recently been extended to the development of human digital twin models that can monitor patient health, 14 for example by determining stroke severity from head vibration. 15 Important related industrial medicine applications include reducing risks of physiological impairments due to human/machine interactions, 9 riding in motor vehicles 16 or industrial equipment, 17 and determining causes of motion sickness. 18 In sports medicine, headmounted and body-worn accelerometers have been used to compare measured and simulated responses of the human body to external mechanical excitations such as simulated sub-concussive head impacts 19 and to investigate the transmissibility of vibrations from the skis to lower back and head in alpine skiing.…”

“…ASD is the standard engineering analysis tool for quantifying random vibrations in many different complex physical systems, 9 including the human body. [10][11][12][15][16][17][18][19][20][21][22][23][24][25][26] In addition to revealing significant details related to sensory reweighting, time-resolved ASD analyses also address the fact that postural sway signals are non-stationary, by capturing the significant time varying spectral changes 100,142 that result from intermittent balance control processes that utilize multiple physiological system inputs and outputs. Ensemble-average ASD analyses have been utilized to identify statistically significant spectral features that can distinguish patients vs. control groups.…”

Design of optimum vibration absorbers for a bus vehicle to suppress unwanted vibrations against the harmonic and random road excitations

“…Professional bus drivers, as occupants operating vehicles for a considerable amount of driving hours, and passengers experience unwanted vibrations particularly because of the road surface excitations [1]. The unwanted vibrations in vehicles are concentrated in relatively low frequencies (0.5-25 Hz), exposing the driver and the passengers to a whole-body-vibration (WBV) condition [2][3][4].…”