Abstract
The precision spool valve is the core component of the electro-hydraulic servo control system, and its performance has an important influence on the flight control of aviation and aerospace products. The non-uniform surface topography error causes a non-uniform mating gap field inside the spool valve, which causes oil leakage and leads to deterioration of the spool valve performance. However, the current oil leakage calculation method only considers the influence of size errors, which is not comprehensive. Thus, how to characterize the mating behavior of the spool valve and its effect on oil leakage with consideration of surface topography errors is the key to evaluating the performance of the spool valve. This paper proposes a new way of analyzing the mating performance of precision spool valves, which considers the surface topography errors based on digital twin technology. Firstly, a general framework for the analysis of mating performance of precision spool valve based on a digital twin is proposed. Then, key technologies of assembly interface geometry modeling, matching behavior modeling and performance analysis are studied. Finally, a quantitative correlation between the mating parameters and the oil leakage of the precision spool valve is revealed. The method is tested on a practical case. This proposed method can provide theoretical support for the accurate prediction and evaluation of the mating performance of the precision spool valve.
Highlights
As the core component of the electro-hydraulic servo control system, precision spool valves are extensively applied to the flight control systems of military products such as aircrafts, rockets and missiles
The assembly interface between the valve spool and the valve sleeve is a random and irregular geometrical surface with various error components such as roughness, waviness and form error rather than an ideal geometrical surface [2]. These uneven surface topography errors affect the assembly performance of the valve spool and valve sleeve, which leads to a non-uniform gap field inside the assembly surface couple, thereby forming a geometrical path for oil leakage
With the precision spool valve as the research object, this paper proposed an overall framework of analyzing assembly performance of precision spool valves based on a digital twin, modeled geometrical topography of the assembly interface, modeled the assembly behavior of precision spool valve, analyzed the mating performance of precision spool valve and established a quantitative correlation between the assembly parameters and oil leakage of the precision spool valve
Summary
As the core component of the electro-hydraulic servo control system, precision spool valves are extensively applied to the flight control systems of military products such as aircrafts, rockets and missiles. With the precision spool valve as the research object, this paper proposed an overall framework of analyzing assembly performance of precision spool valves based on a digital twin, modeled geometrical topography of the assembly interface, modeled the assembly behavior of precision spool valve, analyzed the mating performance of precision spool valve and established a quantitative correlation between the assembly parameters and oil leakage of the precision spool valve. Analyzing the mating behavior precision spool valve based on the geometrical model of the assembly interface topography is of great significance to virtual-real mapping and the construction of the digital twin spool valve. Based on the equation for calculating oil leakage, this paper analyzed the amounts of oil leaked under various conditions, studied the statistical parameters (e.g., average, range and distribution) of oil leakage, and grasped the statistical characteristics of oil leakage with a given specified design tolerance
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
