Optimization of oxidizer weighing process for solid propellant based on discrete element simulation

DOI:	10.11809/bqzbgcxb2023.09.013
Keywords:	solid propellant; oxidizer; DEM; weighting; process optimization
Abstract:	The weighing process is widely used in many fields, in which the mass flow of the discharge port plays a very important role in the weighing accuracy and weighing time of the materials. Based on the milled solid propellant oxidizer materials, the accurate weighing of the materials is realized by a three stage supplementary feeding method. The first stage supplementary feeding adopts the traditional continuous feeding method; the second stage and third stage supplementary feeding select the sinusoidal motion form to control the opening and closing of the discharge port, and is divided into two outlet methods: coarse weighing outlet and fine weighing outlet. The discrete element method (DEM) is used to simulate the three stage supplementary feeding (mainly the second stage and third stage), and the fitting relationship to obtain the effect of sinusoidal frequency on mass flow is a fourth order function. A dual objective optimization mathematical model with the largest weighing accuracy and the smallest consumption time as the indicators is established, and the process parameters are optimized for the three stage supplementary feeding of the last 1kg of weighing. The results show that when the frequency of second stage coarse weighing outlet is 2.5 Hz or 2.1 Hz, and the frequency of third stage fine weighing outlet is 1.6 Hz or 3.0 Hz, the local optimum is achieved, the weighing accuracy is 99.9%, and the estimated time is 1.51 s and 1.52 s. The method has guiding significance for the actual production practice.
Published:	2023-09-28
PDF HTML