{"title":"戴头盔时头部和颈部对-Gx加速度的动态响应","authors":"Xiaoyan Sun, Ming-lei Wu, Heqing Liu, Weiping Bu, Guang Zhao, Jinhuan Zhang, Jinwen Zhang, Lianyun Chen","doi":"10.3760/CMA.J.ISSN.1007-6239.2018.02.005","DOIUrl":null,"url":null,"abstract":"Objective \nTo analyze the dynamics response of head and neck to -Gx acceleration and to evaluate the stability of helmet by simulating the movement of head and neck under -Gx acceleration and measuring the mechanics parameters. \n \n \nMethods \nA swing pendulum was designed based on the head and neck of HYBRID III dummy. The body at the lower end of neck impacted the wave generator when the pendulum swing moved forward. The acceleration of impact, head response, force and torque at lower end of neck and helmet displacement were measured. The differences on dummy's head and neck dynamic response and the displacement of helmet were compared between the states of wearing helmet and wearing helmet mounted display. \n \n \nResults \nThe duration of force and torque at the lower end of dummy′s head and neck was significantly longer than that of impact acceleration. As with the helmet, -Gx peak amplitude of the impact acceleration was (6.82±0.27) G and the pulse width was (42.63±1.04) ms, the peak amplitude and pulse width of head response acceleration was (5.66±0.16) G and (173.91±2.31) ms, the force and torque at lower end of neck was (390.37±10.98) N and (183.51±6.26) ms, (79.64±2.70) N·m and (164.17±1.53) ms respectively. The angular and linear displacement of the helmet relative to head was (13.16°±4.61°) and (21.51±10.58) mm respectively. There were statistically significant differences on pulse width of head response acceleration, force and torque at lower end of neck between the states of wearing helmet and wearing helmet mounted display (t=12.947, 3.105, 17.871, P<0.05). The experiment showed that helmet with display caused bigger displacement. There were statistically significant differences on the peak acceleration and pulse width between the impact and the head response both under the states of wearing helmet and wearing helmet mounted display (t=20.48-485.26, P<0.01). \n \n \nConclusions \nThe swing pendulum test method could basically reflect the dynamics response and motion features of head and neck to -Gx acceleration. The results have important significance on evaluating the safety of head and neck and stability of helmet. \n \n \nKey words: \nAcceleration; Head protective device; Neck; Dynamics response","PeriodicalId":9904,"journal":{"name":"中华航空航天医学杂志","volume":"36 1","pages":"99-104"},"PeriodicalIF":0.0000,"publicationDate":"2018-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Dynamics response of head and neck to -Gx acceleration when wearing helmet\",\"authors\":\"Xiaoyan Sun, Ming-lei Wu, Heqing Liu, Weiping Bu, Guang Zhao, Jinhuan Zhang, Jinwen Zhang, Lianyun Chen\",\"doi\":\"10.3760/CMA.J.ISSN.1007-6239.2018.02.005\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Objective \\nTo analyze the dynamics response of head and neck to -Gx acceleration and to evaluate the stability of helmet by simulating the movement of head and neck under -Gx acceleration and measuring the mechanics parameters. \\n \\n \\nMethods \\nA swing pendulum was designed based on the head and neck of HYBRID III dummy. The body at the lower end of neck impacted the wave generator when the pendulum swing moved forward. The acceleration of impact, head response, force and torque at lower end of neck and helmet displacement were measured. The differences on dummy's head and neck dynamic response and the displacement of helmet were compared between the states of wearing helmet and wearing helmet mounted display. \\n \\n \\nResults \\nThe duration of force and torque at the lower end of dummy′s head and neck was significantly longer than that of impact acceleration. As with the helmet, -Gx peak amplitude of the impact acceleration was (6.82±0.27) G and the pulse width was (42.63±1.04) ms, the peak amplitude and pulse width of head response acceleration was (5.66±0.16) G and (173.91±2.31) ms, the force and torque at lower end of neck was (390.37±10.98) N and (183.51±6.26) ms, (79.64±2.70) N·m and (164.17±1.53) ms respectively. The angular and linear displacement of the helmet relative to head was (13.16°±4.61°) and (21.51±10.58) mm respectively. There were statistically significant differences on pulse width of head response acceleration, force and torque at lower end of neck between the states of wearing helmet and wearing helmet mounted display (t=12.947, 3.105, 17.871, P<0.05). The experiment showed that helmet with display caused bigger displacement. There were statistically significant differences on the peak acceleration and pulse width between the impact and the head response both under the states of wearing helmet and wearing helmet mounted display (t=20.48-485.26, P<0.01). \\n \\n \\nConclusions \\nThe swing pendulum test method could basically reflect the dynamics response and motion features of head and neck to -Gx acceleration. The results have important significance on evaluating the safety of head and neck and stability of helmet. \\n \\n \\nKey words: \\nAcceleration; Head protective device; Neck; Dynamics response\",\"PeriodicalId\":9904,\"journal\":{\"name\":\"中华航空航天医学杂志\",\"volume\":\"36 1\",\"pages\":\"99-104\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2018-06-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"中华航空航天医学杂志\",\"FirstCategoryId\":\"1087\",\"ListUrlMain\":\"https://doi.org/10.3760/CMA.J.ISSN.1007-6239.2018.02.005\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"中华航空航天医学杂志","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.3760/CMA.J.ISSN.1007-6239.2018.02.005","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Dynamics response of head and neck to -Gx acceleration when wearing helmet
Objective
To analyze the dynamics response of head and neck to -Gx acceleration and to evaluate the stability of helmet by simulating the movement of head and neck under -Gx acceleration and measuring the mechanics parameters.
Methods
A swing pendulum was designed based on the head and neck of HYBRID III dummy. The body at the lower end of neck impacted the wave generator when the pendulum swing moved forward. The acceleration of impact, head response, force and torque at lower end of neck and helmet displacement were measured. The differences on dummy's head and neck dynamic response and the displacement of helmet were compared between the states of wearing helmet and wearing helmet mounted display.
Results
The duration of force and torque at the lower end of dummy′s head and neck was significantly longer than that of impact acceleration. As with the helmet, -Gx peak amplitude of the impact acceleration was (6.82±0.27) G and the pulse width was (42.63±1.04) ms, the peak amplitude and pulse width of head response acceleration was (5.66±0.16) G and (173.91±2.31) ms, the force and torque at lower end of neck was (390.37±10.98) N and (183.51±6.26) ms, (79.64±2.70) N·m and (164.17±1.53) ms respectively. The angular and linear displacement of the helmet relative to head was (13.16°±4.61°) and (21.51±10.58) mm respectively. There were statistically significant differences on pulse width of head response acceleration, force and torque at lower end of neck between the states of wearing helmet and wearing helmet mounted display (t=12.947, 3.105, 17.871, P<0.05). The experiment showed that helmet with display caused bigger displacement. There were statistically significant differences on the peak acceleration and pulse width between the impact and the head response both under the states of wearing helmet and wearing helmet mounted display (t=20.48-485.26, P<0.01).
Conclusions
The swing pendulum test method could basically reflect the dynamics response and motion features of head and neck to -Gx acceleration. The results have important significance on evaluating the safety of head and neck and stability of helmet.
Key words:
Acceleration; Head protective device; Neck; Dynamics response
期刊介绍：
The aim of Chinese Journal of Aerospace Medicine is to combine theory and practice, improve and popularize, actively advocate a hundred flowers bloom and a hundred schools of thought contend, advocate seeking truth from facts, promote the development of the related disciplines of aerospace medicine and human efficiency, and promote the exchange and penetration of aerospace medicine and human efficiency with other biomedical and engineering specialties.
Topics of interest for Chinese Journal of Aerospace Medicine include:
-The content of the journal belongs to the discipline of special medicine and military medicine, with the characteristics of multidisciplinary synthesis and cross-penetration, and mainly reflected in the aerospace industry, aerospace flight safety and efficiency, as well as the synthesis of special medicine, preventive medicine, environmental medicine, psychology, etc.
-Military aeromedicine (Air Force, Navy and Army aeromedicine) and civil aeromedicine, with a balance of aerospace medicine are the strengths of the journal.
-The change in aerospace medicine from a focus on promoting physiological compensatory adaptations to enhancing human performance under extreme environmental conditions is what the journal is helping to promote.
-The expansion of manuscripts in high altitude medicine is also a special emphasis of the journal.
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