Abstract: For the purpose of solving seizure problem of hydraulic slide valve caused by viscous heating, a robustness design method was put forward basing on the methods of airflow-coal-heat coupled of the hydraulic slide valve structure and multidisciplinary design optimization. Using ordered coupling style, under the airflow-coal-heat coupled of the hydraulic slide valve structure, sensitive factors of seizure of hydraulic slide valve caused by the spool deformation are obtained by the flow finite element method. And, the response relation between the spool deformation and sensitive factors is expressed by the response surface function model.Then, the spool structure of the hydraulic slide valve is designed by the 6σ design method and the robustness of the designed spool is verified by Monte Carlo method.The example shows the spool structure,placket of slide valve, the load flow rate,the media temperature are the sensitive factors that give rise to the seizure of hydraulic slide valve. Robust design method is better than traditional design methods for the seizure of slide valve and multi-factor complex problems.

Key words: seizure of slide valve, airflowcoalheat coupled, viscous heating, robustness design method