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A new vibration isolation bed stage with magnetorheological dampers for ambulance vehicles

机译：新型带磁流变阻尼器的防震床台，用于救护车

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摘要

The vibration experienced in an ambulance can lead to secondary injury to a patient and discourage a paramedic from providing emergency care. In this study, with the goal of resolving this problem, a new vibration isolation bed stage associated with magnetorheological (MR) dampers is proposed to ensure ride quality as well as better care for the patient while he/she is being transported. The bed stage proposed in this work can isolate vibrations in the vertical, rolling and pitching directions to reflect the reality that occurs in the ambulance. Firstly, an appropriate-sized MR damper is designed based on the field-dependent rheological properties of MR fluid, and the damping force characteristics of a MR damper are evaluated as a function of the current. A mechanical model of the proposed vibration isolation bed stage is then established to derive the governing equations of motion. Subsequently, a sliding mode controller is formulated to control the vibrations caused from the imposed excitation signals; those signals are directly measured using a real ambulance subjected to bump-and-curve road conditions. Using the controller based on the dynamic motion of the bed stage, the vibration control performance is evaluated in both the vertical and pitch directions. It is demonstrated that the magnitude of the vibration in the patient compartment of the ambulance can be significantly reduced by applying an input current to the MR dampers installed for the new bed stage.
机译：救护车中经历的振动会导致患者继发伤害，并阻碍护理人员提供紧急护理。在本研究中，以解决此问题为目标，提出了一种新的与磁流变（MR）阻尼器相关的隔振床台，以确保乘坐质量以及患者在运输过程中得到更好的护理。在这项工作中提出的床台可以隔离垂直，滚动和俯仰方向上的振动，以反映救护车中发生的真实情况。首先，根据磁阻流体的场相关流变特性，设计合适尺寸的磁阻阻尼器，并根据电流评估磁阻阻尼器的阻尼力特性。然后建立所提出的隔振床台的机械模型，以导出运动的控制方程。随后，制定了一种滑模控制器来控制由施加的激励信号引起的振动。这些信号是使用遇到弯道的真实救护车直接测量的。使用基于床架动态运动的控制器，可在垂直和俯仰方向上评估振动控制性能。已经证明，通过将输入电流施加到为新床阶段安装的MR阻尼器上，可以显着降低救护车患者室中的振动幅度。

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