北京生物医学工程

囊式充液抗荷服过载响应特性仿真研究

Study on the operation of overload response characteristic of bladder liquid-filled anti-G suit based on finite element method

作者：陈尧李先学丁立

单位：北京航空航天大学生物与医学工程学院(北京 100083)

关键词：充液抗荷服；过载响应；有限元；生物力学；仿真

分类号：R318.04

出版年·卷·期（页码）：2019·38·2（111-118）

摘要：

目的高性能战机飞行时会产生很高的过载加速度，导致人体血液聚集在下肢和足部，不能回流到上肢和大脑，造成飞行员黑视、呼吸障碍以及丧失意识等。目前通常采用充气式抗荷服对抗过载造成的生理障碍，但使用充气式抗荷服操作复杂且反应延迟，会使飞行员产生疲劳。为解决充气抗荷服的这些问题，一种具有快速冲压效果的新型充液抗荷服已被提出。为研究充液抗荷服的过载响应特性，本文以囊式充液抗荷服为例，建立了人体下肢有限元模型，对不同充液水平、不同过载下的肌肉和服装进行了数值仿真研究。方法首先通过ABAQUS有限元软件进行建模，再将不同静水压模拟不同过载并通过改变充液管管腔厚度模拟不同充液水平，最后计算囊式充液抗荷服在不同过载、不同充液水平作用下的体表压力、肌肉变形等生理和物理参数变化情况。结果（1）肌肉体表压力随过载增加而增大；（2）肌肉体表压力随充液量增加而减小；（3）服装最大应力和最大变形量随过载增加和充液水平增加而增大。结论应当寻找合适的充液水平，保证体表压力和服装应力在不同过载下均处于较合适的水平，从而保证囊式充液抗荷服的设计更为有效、安全。

Objective High-performance military aircraft can generate extremely high acceleration overload,resulting in blood aggregation in the legs and feet,and can not flow back to the upper limbs and brain, which causes black vision,breathing disorders and loss of consciousness on the pilots. Pneumatic anti-G suit is usually used to resist physiological obstacles caused by overloading. However the pneumatic anti-Gsuit iscomplicated and delayed in response, which will cause fatigue for pilots. To aviod these disadvantages,a new type of liquid-filled anti-G suit with rapid stamping effect is proposed. To study on the overload response characteristics of the liquid-filled anti-G suit,this paper takes the bladder liquid-filled anti-G suit as example,builds a finite elementmodel of the lower limb of the human body to simulate the muscle and clothes under different liquid levels and different overloads. Methods First, the ABAQUS finite element software is used for modeling, and then the different hydrostatic pressure is used to simulate different overloads,and the different liquid filling levels are simulated by changing the thickness of the liquid filled tube. Finally,we calculate the body surface pressure, muscle deformation and other physiological and physical parameters under the effects of the bladder liquid-filled anti-G suit. Results (1) The body surface pressure gradually increases along with the increase of the pressure overload. (2) The body surface pressure gradually decreases along with the increase of the liquid-filled level. (3) The maximum stress and maximum deformation of the clothes gradually increase along with the increase of the pressure overload and the liquid-filled level. Conclusions It is necessary to find the appropriate level of liquid filling to ensure that the body surface pressure and clothing stress are in a more suitable level under different overloads,thus ensuring the design of the bladder liquid-filled anti-G suit is more effective and safety.

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