Seat and footrest shocks and vibrations in manual wheelchairs with and without suspension
Seat and footrest shocks and vibrations in manual wheelchairs with and without suspension
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DOI：
10.1053/apmr.2003.50069
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发表时间：
2003-01-01
影响因子：
4.3
通讯作者：
Ammer, WA
中科院分区：
文献类型：
--
作者：
Cooper, RA;Wolf, E;Ammer, WA
目的：为了研究传递给手动轮椅乘客的冲击和振动的差异，有和没有悬架脚轮叉，有和没有后悬架系统。设计：重复测量工程测试，设置：康复工程中心，有轮椅标准测试实验室。样本：六辆手动轮椅。干预措施：美国国家标准协会/使用北美康复工程和辅助技术协会的轮椅试验假人和Hybrid III试验假人进行冲击和振动试验配备原始设备制造商（OEM）脚轮叉和悬架脚轮叉的轮椅中的变速器。超轻轮椅，其中一半有工厂配备的后悬架系统，进行了测试。测试进行了双鼓轮椅test machines.Main结果Measures：冲击进行了检查，通过使用峰值加速度和峰值加速度发生的频率为座椅和脚踏板。通过座椅和脚踏板的每倍频程加速度功率表征振动，结果：在座椅处的峰值加速度中发现了显著差异（P= 0.0004）和脚踏板（P= 0.0007）在带OEM脚轮叉的轮椅和带悬挂脚轮的轮椅之间，有悬架的轮椅有明显不同的频率，在该频率下，座椅和座椅的峰值加速度都发生了变化。（P=.01）和脚踏板（P=.0001）。具有悬架脚轮叉的轮椅具有比具有OEM脚轮叉的轮椅更低的每八度总功率。对于脚踏板振动，除了与频率大于78.75Hz相关的那些之外，在所有倍频程中，发现不同类型的脚轮叉之间存在显著差异。在7，81和9.84Hz的倍频程内，有和无后悬架的轮椅的每倍频程座椅振动总功率存在显著差异（P=.01）和12.40和15，63 Hz（P=.008）.结论：悬架脚轮叉减少了手动轮椅使用者受到的冲击和振动，后悬架系统减少了一些与冲击和振动暴露相关的因素，但它们并不明显上级传统设计。
Objective: To examine differences in the shock and vibration transmitted to an occupant of a manual wheelchair with and Without suspension caster forks and with and without rear-suspension systems.Design: Repeated-measures engineering testing,Setting: Rehabilitation engineering center With a wheelchair standards test laboratory.Specimens: Six manual wheelchairs.Interventions: An American National Standards Institute/Rehabilitation Engineering and Assistive Technology Society of North America wheelchair test dummy and a Hybrid III test dummy were used to test shock and vibration transmission in wheelchairs equipped with original equipment manufacturer (OEM) caster forks and suspension caster forks. Ultralight wheelchairs, half of which had factory-equipped rear-suspension systems, were tested. Testing was conducted on a double-drum wheelchair test machine.Main Outcome Measures: Shocks were examined by using peak acceleration and the frequency at which peak acceleration occurs for the seat and footrest. Vibration was characterized by the acceleration power per octave for the seat and footrest,Results: Significant differences were found in the peak accelerations at the seat (P=.0004) and footrest (P=.0007) between the Wheelchairs with the OEM caster forks and those with the suspension casters, The wheelchairs with suspension had significantly different frequencies at which the peak accelerations occurred for both the seat (P=.01) and footrest (P=.0001). The wheelchairs with suspension caster forks had a lower total power per octave than the wheelchairs with the OEM caster forks. For the footrest vibrations, significant differences Were found between the types of caster forks for all octaves except those associated with frequencies more than 78.75Hz. There were significant differences for wheelchairs with and without rear suspension for total power per octave of seat vibrations in the octaves between 7,81 and 9.84Hz (P=.01) and 12.40 and 15,63Hz (P=.008).Conclusions: Suspension caster forks reduce the shock and vibration exposure to the user of a manual wheelchair, Rear-suspension systems reduce some of the factors related to shock and vibration exposure, but they are not clearly superior to traditional designs.