失重条件下呼吸力学参数测试方法及实现

目的研究失重情况下的航天员呼吸运动,准确获取其呼吸力学参数。方法在对国内外相关研究成果进行调研的基础上,提出基于气体流量传感器和压力传感器的呼吸力学参数检测方法。结果设计并完成了硬件电路与软件编写。采用三次拟合法对标定数据进行曲线拟合,所得气体流量拟合的相关系数达到0.99,而压力拟合的相关系数达到0.995。对硬件电路测试,测得最大相对误差小于1%。经实验结果分析得出系统最大相对误差仅为4%,且结果稳定性良好,符合系统的要求,且实现了测试设备的小型化。结论样机具有良好的稳定性和精度,参数实时显示。

Method for Measuring Respiratory Mechanics Parameters and Implementing it Under Weightlessness Condition

Objective Astronauts’ breathing movements under weightlessness condition is studied to gain their respiratory mechanics parameters accurately.Methods On the basis of detailed investigation of domestic and abroad research results,a method to measure the respiratory mechanics parameters based on the direct measurement with gas flow sensor and gas pressure sensor was proposed.Results The hardware circuits were designed and made.The software programs were edited.In order to increase the measuring precision,the cubic curve fitting method was used to calibrate the gas flow and the gas pressure.The correlation coefficient of fitted gas flow reached 0.99.The correlation coefficient of fitted gas pressure reached 0.995.For hardware circuit testing,the maximum relative error was less than 1%.By analysis of experimental results,the maximal relative error of this system was only 4 %.The results were of good stability and in compliance with system requirements.Test equipments were made miniature.Conclusion The prototype has good stability and precision.The parameters are real time displayed.