李慧奇,宁运琨,杨俊飞,赵国如.穿戴式跌倒防护安全气囊研究[J].集成技术,2018,7(2):69-77
穿戴式跌倒防护安全气囊研究
The Research of Wearable Fall Protective Airbag
  
DOI:
中文关键词:  跌倒;定位精度;充气机构;防护气囊;有限元分析
英文关键词:fall; positioning accuracy; inflating mechanism; protective airbag; finite element analysis
基金项目:深圳市科技创新委项目(KQJSCX20160301141256)
作者单位
李慧奇 中国科学院深圳先进技术研究院 深圳 518055 
宁运琨 中国科学院深圳先进技术研究院 深圳 518055 
杨俊飞 中国科学院深圳先进技术研究院 深圳 518055 
赵国如 中国科学院深圳先进技术研究院 深圳 518055 
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中文摘要:
      跌倒是造成老年人意外伤害或死亡的首要原因,全世界 65 岁以上老人中每年大约有 1/3 发 生过跌倒,对人体尤其是髋关节造成较大伤害。利用充气气囊作为缓冲来减轻伤害是目前跌倒防护最有效的手段。该文对穿戴式跌倒防护安全气囊系统的总体构成、定位精度、充气机构、囊体结构参数 等关键技术展开研究,并完成样机实现。系统由电源模块、主控模块、传感模块、定位模块、通讯模块、充气机构、压缩气瓶和囊体结构等关键部分组成。其中定位模块支持 GPS 和 WIFI 两种位置定位 方式,室外定位精度仅约 7 m,室内定位精度约 60 m。设计出了充气机构以及基于人体髋部结构的仿生吸震囊体的优化结构参数,对 8 g、12 g 和 16 g 等多规格压缩气瓶进行了冲刺可靠性试验,并用高速动态记录仪测得充满气的平均时间为 386.9 ms。此外,采用 MIMICS 软件及人体髋部位置的二维电子计算机断层扫描图片建立了人体髋骨的三维有限元模型,并采用 ANSYS 软件建立髋保护缓冲气囊的有限元模型,分别建立了无防护情况下侧方跌倒和有髋保护缓冲气囊防护情况下侧方跌倒模型。对 比结果显示,髋骨受到的峰值冲击力比不采用任何防护减小了 70%,而能量吸收则减小了 83.8%。
英文摘要:
      Falls are the first leading cause of unintentional injury deaths in the eldly. About one third of elderlies larger than 65 years old happens to fall each year, which causes huge harm to the human body especially the hip joint. Using inflatable air bag to reduce damage is the most effective means for falling protection at present. In this paper, some key technologies such as overall composition, positioning accuracy, inflatable mechanism and parameters of the capsule were studied and implemented in the wearable fall protective airbag. The system is composed of power module, main control module, sensing module, positioning module, communication module, inflatable mechanism, compressed gas cylinder and capsule structure. It supports two positioning methods of GPS and WIFI, where the indoor positioning accuracy is about 60 m and the outdoor is only about 7 m. Additionally, the optimized structure parameters of an inflatable mechanism and a bionic shock absorber based on the structure of the human hip were designed. The reliability test of sprinting was carried out on 8 g, 12 g and 16 g, and the average time of filling gas is 386.9 ms with high speed dynamic recorder. A 3D geometric model of human hip was accomplished by importing the 2D computed tomography images of the hip, and a finite element model of the airbag was completed with the finite element analysis software ANSYS. The models of sideway fall were established in the case of absence in falls protective side and presence in hip protection cushion airbag protection. Comparison shows that the hip-protected’s good performance is achieved, with decreasing the peak impact force of the hip by 70% and the absorption of energy by 83.8%.
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