Influence characteristics of electrical parameters and vibration isolation properties of the stretcher system based on parallel mechanism and self-powered magneto-rheological damper

Gao, Xiang; Niu, Junchuan; Liu, Zhihui; Shen, Gang

doi:10.1177/1077546319889847

Cited by 1 publication

(1 citation statement)

References 22 publications

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“…For a more intricate solution with higher costs, active vibration isolators can be employed. Gao et al 22 developed an active system utilizing a self-powered magneto-rheological damper in the stretcher to diminish vibrations in horizontal and vertical directions. The controlled system achieved an 80% reduction in RMS acceleration vibrations compared to a passive system.…”

Section: Mitigating Stretcher Vibrationmentioning

confidence: 99%

Assessing patient transport conditions during ambulance transit

Uchima,

Idehara

2024

Proc Inst Mech Eng H

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Emergency ambulances play a vital role in medical rescue and patient transportation, but their transit can impact patient health due to vehicle dynamic forces and vibrations. This study evaluates patient transport conditions on a stretcher subjected to vertical vibration excitation from road unevenness. Using an eight-degree-of-freedom numerical model, we analyze the construction parameters of a medical stretcher’s support and vehicle suspension. Actual experimental data from an emergency vehicle were utilized to assess the vibration conditions experienced by both the stretcher and the ambulance floor. The model is adjusted based on measurements, specifically targeting the main vibration modes. The investigation involves determining temporal responses for vertical accelerations and characterizing vibration modal parameters under various transportation conditions. Notably, several system natural frequencies fall within the range of human body frequencies, making them susceptible to mechanical excitation, particularly in the human neck, abdomen, and spine. A sensitivity analysis underscores the influence of medical stretcher support structure parameters on patient comfort. Increasing support stiffness, which alters the stretcher’s natural frequency, and damping coefficient reduce vibration propagation between the vehicle and the patient. Additionally, the research predicts the model’s dynamic behavior on roads with low-quality pavement, indicating vibrational amplitudes that could potentially be discomforting and unhealthy for individuals. The study illustrates a vibration exposure period on a class E road, revealing that transportation longer than 25 min may cause damage to patient health.

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Section: Mitigating Stretcher Vibrationmentioning

confidence: 99%