民机配平空气系统小偏差化动态建模仿真方法

配平空气系统（TAS）作为民用飞机空调系统（ACS）中的子系统之一，其本质是舱室内温度调节的高温气体支路。该系统的动态特性较大地影响着下游乃至舱室内空气参数的变化，不利于下游参数的稳定。因此需要依据系统固有的动态特性，通过设计系统的控制规律，达到稳定下游空气参数的目的。随着系统方案及部件的更新换代，民机配平空气系统的压力控制方式逐步由机械气动式压力调节活门转变为电动式压力调节活门辅以压力传感器的方式。这种方式要求对配平空气系统的动态特性进行快速、准确的仿真，并能够依据仿真结果进行压力控制律设计。本文提出小偏差化的线性化处理方法作为动态特性建模仿真的理论推导依据，对采用电动式压力调节活门和压力传感器方案的典型民机配平空气系统建立高效的动态仿真模型。经校验，该方法结果准确。此外，还根据动态特性分析结果给出电动式压力调节活门的控制律设计实例，有效实现了良好的压力调节效果。根据设计流程提出了配平空气系统的压力控制需求，为民机空调系统的动态仿真建模方法提供指导思路。

Small deviation linearization method for dynamic modeling and simulation of trim air system in civil aircraft

As one of the subsystems of Air Conditioning System (ACS) in civil aircraft, Trim Air System (TAS) is essentially the hot air branch to regulate cabin temperature. While the dynamic characteristics of TAS greatly affect the variation of downstream and cabin air parameters, it goes against with the stability of downstream parameters. Therefore, the system control law should be designed based on the inherent dynamic characteristics of the system, so as to stabilize the downstream parameters. With the updating of the system architecture and system components, the pressure is regulated by electrically operated Trim Air Pressure Regulating Valve (TAPRV) and Trim Air Pressure Sensor (TAPS) instead of the traditional mechanical pneumatic TAPRV. The dynamic characteristics of TAS is required to be simulated efficiently and accurately. In this paper, a small deviation linearization method is provided for theoretical derivation, and an efficient dynamic simulation model for typical electrically operated TAS is established. The method is validated to be accurate. Then the control law of electrically TAPRV is designed as an example, achieving good pressure regulating effect. Based on the design flow, this research provides TAS pressure control requirements, and provides guidance for the dynamic modeling and simulation of ACS.