A Complex Circuit Contamination Analysis Method Based on Multi-loop Transfer Function Modeling

This paper proposes a contamination model based on the block diagram of the transfer function to study the pollutant migration process in complex multi-loop systems. The existing pollution research results of single-loop systems are difficult to be directly applied to multi-loop systems due to their different structures and characteristics. The pollution model can quantitatively analyze the pollution degree of each section of the multi-loop system and evaluate the health status of the circuit. The paper also obtains the following conclusions through simulation analysis: (1) The system pollution degree will reach dynamic equilibrium under the joint action of the pollution invasion element and the filter, but the pollution degree of each section of the circuit is different. The simulation results can evaluate the health status of each circuit and provide a reference for the installation of the filter and pollution-sensitive element. (2) There is a non-linear relationship between the repeat filtration and the filtration performance of the filter. As the repetition filtration degree increases, the filtration performance in the process has a rapid decrease. Repeat filtration degree parameters can determine the timing of filter replacement. (3) The minimum filtration degree parameter for this hydraulic system metering unit to achieve the desired cleanliness less than 9 under constant contamination intrusion condition is 6.14, and the limit scale capacity of the filter is 221 g. This paper provides a new method and reference for contamination research of complex multi-loop systems.