高流量呼吸湿化治疗仪的机理分析与数据建模

Mechanism Analysis and Data Modeling of High-Flow Heated Respiratory Humidifier

摘要:

绝对湿度是高流量呼吸湿化治疗仪的重要控制参数,控制不当会影响治疗效果,建立准确稳态模型是控制绝对湿度的基础。通过对湿化仪的系统结构和工作原理进行研究,建立湿化仪稳态过程的机理模型。此模型具有多元、高阶次和非线性且缺少部分可测参数,难以实现模型的精确辨识。采用多元线性拟合方法,建立以湿化罐出气口温度为控制目标的稳态模型,仪器测试结果表明通过对湿化罐出气口温度进行控制,实现了对湿化罐出气口绝对湿度的间接控制,验证了数据模型的有效性和实用性。

Abstract:

Absolute humidity is an important control parameter for high-flow respiratory humidifiers. Improper control can affect the therapeutic effect. Established an accurate steady-state model is the basis for controlling absolute humidity. Through the research on the system structure and working principle of the humidifier, the mechanism model of the steady state process of the humidifier was established. This model had multiple dimensions, high order and nonlinearity and lacked some measurable parameters, made it difficult to accurately identify the model. A multi-linear linear fitting method was used to establish a steady-state model with the outlet temperature of the humidification tank as the control target. The instrument test results show that the absolute humidity of the outlet of the humidification tank is indirectly controlled by the temperature of the outlet of the humidification tank. Control, verify the validity and practicability of the data model.