由于气体的可压缩性，气压信号在长气管中的传递特性表现为非线性，这种非线性给系统设计和应用带来困难．从工程应用的角度出发，通过实验对气动系统中长气管的主要特征——气压信号的延迟进行了研究，根据长气管的物理特点建立了动力模型及数学模型，并对模型参数进行了辨识和分析，还根据流体力学的理论探讨了管内流体的状态，最后通过对数学模型的仿真和实验进行了比较，两者具有较好的一致性． Due to the compressibility of the gas, the transmission characteristics of the pressure signal in the long gas pipe is nonlinear, which brings difficulties to the system design and application. From the perspective of engineering application, the main characteristic of long-length air pipe in pneumatic system, namely the delay of barometric pressure signal, was studied experimentally. The dynamic model and mathematical model were established according to the physical characteristics of long-tailed pipe and the model parameters were identified and analyzed According to the theory of fluid mechanics, the state of the fluid in the tube is also discussed. Finally, the simulation and experiment of the mathematical model are compared, and the two are in good agreement.