Effect of Heat Transfer Through Walls on Response of Pneumatic System

Rahman, Fazlar; Akanda, Md. Abdus Salam

doi:10.1007/s13369-019-03879-7

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…First, the system presents time-varying dynamics because the temperature within the airtight brake cylinder is inherently varying due to the thermal effect during the pressure regulation process. Specifically, due to the compressibility of air during the charging and discharging process, the changed pressure causes the air temperature in the brake cylinder to vary rapidly in a short time [2]. In reverse, the varying temperature resulting from the pressure change significantly affects the pressure response of the brake cylinder.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty-Estimation-Based Prescribed Performance Pressure Control for Train Electropneumatic Brake Systems

Zhang,

Xu,

Yang

et al. 2023

Actuators

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Fast and precise pressure control for an electropneumatic brake system is essential for ensuring the safe operation of trains. However, the nonlinearity and uncertainties of the system make controller design challenging. This paper proposes a prescribed performance control method integrating an extended state observer to address this issue. A thermodynamical model of the brake cylinder is first built based on the pneumatic characteristics of the braking system, considering multiple modes, coupling effects, and input saturation. Then, an extended state observer is designed to estimate model uncertainty due to temperature variation and disturbances and to achieve online compensation of the model. A feedback control law with a specified prescribed performance function is developed based on the updated thermodynamic model to guarantee the transient and steady-state performance of the pressure control. A parameter adaptive method is also utilized to handle input saturation. The observer’s bounded convergence and stability analysis of the closed-loop control system is given using the Lyapunov theory. Compared experimental results are provided to verify the effectiveness of the proposed method.

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Section: Introductionmentioning

confidence: 99%