Positioning Accuracy Reliability Analysis for Ammunition Manipulator Based on the Second-Order Mixture Importance Sampling Method

The ammunition manipulator is an important actuator of the modern self-propelled ammunition supply and delivery system. The positioning accuracy reliability (PAR) directly affects the firing stability of the entire artillery system. Therefore, it is of great significance to accurately and efficiently evaluate the PAR. This paper aims to conduct an in-depth analysis of the PAR for ammunition manipulator. First, a rigid–flexible coupling dynamic model of the artillery manipulator was established; Subsequently, a reliability evaluation strategy for positioning accuracy of ammunition manipulator was developed by combining the second-order approximation of the limit-state function (LSF) and the mixture importance sampling (MIS) method. Meanwhile, the effectiveness of the constructed model was verified through experimental testing. Finally, the influence of the clearance coefficient on the positioning accuracy of the ammunition manipulator was studied in detail by analyzing three cases.