Objective: To study epidemiological characteristics of the military training injuries (MTI) during parachuting training of the air force and sea training of the navy. Methods:The subjects of this study were 1382, incl...Objective: To study epidemiological characteristics of the military training injuries (MTI) during parachuting training of the air force and sea training of the navy. Methods:The subjects of this study were 1382, including 971 navy soldiers (300 recruits and 671 soldiers) and 411 for force recruits. Navy: Each of injured soldiers was investigated by the trained battalion surgeon; Air force: When the parachuting training finished , two doctors in specific field screened and investigated them one by one. Results: The incidence of injury in for force recruits was 16.3% and in navy recruits was 18. 7%. The incidence of navy soldiers was 5.5%, which was significantly lower than that of navy recruits. There was a peak of incidence in the 2nd training month of navy recruits. The peak of incidence of navy soldiers was in 1st training month. The incidence of air force maintained at a high level except 2nd training month. The incidences of lower legs and ankles were higher than those of other sites in navy with percentage of 42.9% and 17.9% respectively. The incidences of ankles and lumbar region were higher than those of other sites in air force with percentage of 26.9% and 23.9% respectively. Incidence of acute traumatic injuries was highest during special course. Conclusion: The result showed the incidence of injury in sea and parachuting training varied. Different preventive measures should be adopted during special training.展开更多
该文基于有限元-统计能量分析方法(Finite element-Statistical energy analysis,FE-SEA)建立市域列车碳钢底架地板结构隔声特性预测模型,分析地板底架结构的筋板角度、筋板厚度、上板和下板厚度4个参数对其隔声特性的影响,并以质量定...该文基于有限元-统计能量分析方法(Finite element-Statistical energy analysis,FE-SEA)建立市域列车碳钢底架地板结构隔声特性预测模型,分析地板底架结构的筋板角度、筋板厚度、上板和下板厚度4个参数对其隔声特性的影响,并以质量定律的轻量化原则为判定标准对4个结构参数进行选择,以确定最优方案,最终实现碳钢底架地板结构的轻量化声学优化。结果表明,在所列举的碳钢底架地板结构参数优化方案中,选择筋板角度为40°,筋板厚度为0.9 mm,上板厚度为2.4 mm,下板厚度为3.0 mm的碳钢底架地板方案,其具有最佳的轻量化声学优化效果。该研究可为市域列车车体结构的轻量化减振降噪优化设计提供参考。展开更多
文摘Objective: To study epidemiological characteristics of the military training injuries (MTI) during parachuting training of the air force and sea training of the navy. Methods:The subjects of this study were 1382, including 971 navy soldiers (300 recruits and 671 soldiers) and 411 for force recruits. Navy: Each of injured soldiers was investigated by the trained battalion surgeon; Air force: When the parachuting training finished , two doctors in specific field screened and investigated them one by one. Results: The incidence of injury in for force recruits was 16.3% and in navy recruits was 18. 7%. The incidence of navy soldiers was 5.5%, which was significantly lower than that of navy recruits. There was a peak of incidence in the 2nd training month of navy recruits. The peak of incidence of navy soldiers was in 1st training month. The incidence of air force maintained at a high level except 2nd training month. The incidences of lower legs and ankles were higher than those of other sites in navy with percentage of 42.9% and 17.9% respectively. The incidences of ankles and lumbar region were higher than those of other sites in air force with percentage of 26.9% and 23.9% respectively. Incidence of acute traumatic injuries was highest during special course. Conclusion: The result showed the incidence of injury in sea and parachuting training varied. Different preventive measures should be adopted during special training.
