An investigation into a synthetic vibration model for humans:

Kubo, Mitsunori; Terauchi, Fumio; Aoki, Hiroyuki; Matsuoka, Yoh

doi:10.1016/s0169-8141(00)00052-4

Cited by 35 publications

(8 citation statements)

References 10 publications

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“…As reported in the literature, the natural resonance frequencies of the human head, chest and abdomen range between 2 and 11 Hz [41]. Prolonged exposure of human body to vibration, especially at its resonant frequency may cause undue stress and discomfort [42].…”

Section: Discussionmentioning

confidence: 99%

Acute Effects of Whole-Body Vibration on Peripheral Blood Flow, Vibrotactile Perception and Balance in Older Adults

Mahbub

Hase

Yamaguchi

et al. 2020

IJERPH

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Background: Non-invasive application of whole-body vibration (WBV) has the potential for inducing improvements in impaired peripheral circulation, cutaneous sensation and balance among older adults. However, relevant studies have frequently applied high magnitudes of vibration and show conflicting and inconclusive results. Therefore, we attempted to ascertain the acute responses in those parameters from exposure of thirty older subjects to WBV of three different magnitudes, defined according to ISO 2631-1 (1997). Methods: Each subject randomly underwent four sessions of intervention (three bouts of 1 min exposure with 1 min between-bout rests): WBV at 15, 20, or 25 Hz with a peak-to-peak displacement of 4 mm, or control condition. Results: Both during and after intervention, dorsal foot skin blood flow increased significantly under 20 and 25 Hz exposure conditions with greater responses under the latter condition, the magnitude of which slightly exceeded the recommended value. Plantar vibrotactile perception showed significant increases after WBV exposure with overall greater responses under higher frequencies of vibration. In contrast, no WBV-induced change in balance was observed. Conclusions: WBV at 20 Hz with a magnitude within the recommended limit can be effective in inducing enhancements in peripheral blood flow; however, the same magnitude of vibration seems insufficient in improving balance among older adults.

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Section: Discussionmentioning

confidence: 99%

Acute Effects of Whole-Body Vibration on Peripheral Blood Flow, Vibrotactile Perception and Balance in Older Adults

Mahbub

Hase

Yamaguchi

et al. 2020

IJERPH

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“…The accelerations of the individual points are not included in the results, since the scope is to achieve an overall reduction in vibration. However, it should be emphasized that an overall objective, such as the VI of Equation (16), can result in an increase of the acceleration for individual subjects. This aspect needs attention if there are prescribed limits for any of the subjects, which can be a requirement set by HEMS operators in case of human patients or operators of medical equipment.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, vibration of patients is not only a comfort problem, but also puts extra stress on them. It is reported that an increased vibrational level degrades the physiological and psychological condition [16], eases bleeding in patients with pelvic fractures [17], and has stressful effects on infants [18]. Therefore, vibrations can have drastic consequences on a patient's health in HEMS, where persistent vibrations always exist.…”

Section: Patientmentioning

confidence: 99%

“…The output vector includes the variables and consists of frequency-weighted vertical accelerations of these subjects: y = a pi,1 a pi,2 a cr,1 a cr,2 a pt a e T (15) where a pi,1 and a pi,2 is the acceleration of each pilot at the seat surface; a cr,1 and a cr,2 is the acceleration of each crew at the seat surface; a pt is the average of the sum of the acceleration at the cushion surface under the head, upper body, and lower body segments; a e is the acceleration of the center of gravity of the equipment. The objective function of the optimization is referred to as vibration index (VI): VI = y T Wy (16) where: To illustrate the sensitivity of the relative weights on the vibration performance, four values of the cost matrix W are used. The pilots are present in all optimization cases and always included in the cost matrix.…”

Section: Configuration Optimizationmentioning

confidence: 99%

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Cabin Layout Optimization for Vibration Hazard Reduction in Helicopter Emergency Medical Service

et al. 2020

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Helicopter Emergency and Medical Service (HEMS) vehicles require a specially configured cabin that supports the quick transport of a rescue team to the site of an emergency and return of patients back to a full capacity hospital, while sustaining the patients’ health using specifically designed, but otherwise state-of-the-art life-support equipment. The effectiveness and safety of the service may be challenged by the vibratory level, which could be improved by optimally positioning the affected subjects within the cabin. However, the bare dynamical response of the airframe can lead to erroneous evaluation of vibration performance, since pilots, crew, patients, and medical equipment dynamically interact with the helicopter through their interfaces with the structure. Therefore, layout optimization of a HEMS vehicle for low vibration requires the capability to efficiently analyze a large set of candidate coupled helicopter-interface-subject configurations, reaching a suitable trade-off between model detail and computational cost. This work presents an effective vibration rating of medical helicopters to support vibration hazard reduction by minimization of cabin interior accelerations. The tool is able to model high-fidelity rotorcraft aeroservoelasticity, easily connect formulations representing the dynamics of humans, equipment, and their interfaces, and calculate the vibration performance of the resulting coupled models. The approach is applied to a medium-weight helicopter to find its lowest vibration HEMS configuration. It is demonstrated that the optimal positioning of HEMS subjects can significantly reduce vibration hazard and improve operation safety, nearly as effectively as the application of vibration attenuation solutions with a fixed cabin layout.

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“…Authors of publication [15] point out that the person driving the van under increasing vibration conditions will experience three types of adverse effects. These are the physical, physiological and psychological effects, which include instances of tired eyes, absent-mindedness, irritation, and to a lesser degree, the loss of patience, headache, backache, dizziness and nausea.…”

Section: Adverse Effect Of Vibrationsmentioning

confidence: 99%

Personalized Anti-Vibration Protection for Telematics Devices in Urban Freight Transport Vehicles

Wojnowski

Chmiel

2021

Energies

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Vibrations are a major cause of human health disorders, circuit boards and machinery damage. Vibration dampers are considered to be the best option to counter these issues. Three-dimensional printing techniques play an increasingly important role in manufacturing small polymer parts with tailored properties. Thermoplastic elastomers (TPE) constitute a perfect material for manufacturing small-scale series absorber prototypes due to their thermoplastic nature, good elasticity and damping properties. This paper proposes a novel multi-level approach to the design and manufacturing process, e.g., the first level—selection of material; second level—decision about the geometry of a damper; third—selection of technological printing parameters; fourth—post-printing treatment. This work primarily aims to overview the design and manufacturing process levels. The impact of each step on the damping capacity of small absorbers is assessed. It was found that thermoplastic elastomers and fused deposition modeling (FDM) have huge potential in shaping the physical properties of small, elastomeric absorbers. It was assessed that at every step of the multilevel design and manufacturing process (MDMP), the designer could tailor the damping to meet the desired criteria of a final product: a cylinder-shaped hollow damper that can be made from TPE polymer without post-printing treatment and is characterized by good damping.

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An investigation into a synthetic vibration model for humans:

Cited by 35 publications

References 10 publications

Acute Effects of Whole-Body Vibration on Peripheral Blood Flow, Vibrotactile Perception and Balance in Older Adults

Acute Effects of Whole-Body Vibration on Peripheral Blood Flow, Vibrotactile Perception and Balance in Older Adults

Cabin Layout Optimization for Vibration Hazard Reduction in Helicopter Emergency Medical Service

Personalized Anti-Vibration Protection for Telematics Devices in Urban Freight Transport Vehicles

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