Online judgment method for absorption end point of typical modified double-base propellant absorption drug

Abstract

The invention discloses an online judgment method for an absorption end point of a typical modified double-base propellant absorption drug. The method comprises the following steps of firstly, respectively collecting NC with different concentrations and near infrared spectrums of high-energy explosives, determining typical characteristic peaks, and selecting a characteristic wave band as a basis for calculating the standard deviation of a moving window; then setting a workflow of repeated sampling in the absorption process; then simulating an absorption process, and carrying out real-time and online acquisition on the mixing condition of the absorption process; and finally, at different mixing time points, selecting n continuous spectrums each time for calculation, calculating real-time difference and standard deviation between the whole process and near infrared spectrums of characteristic peaks of main components through an MBSD algorithm, and judging an absorption end point. The method is advantaged in that by selecting the near infrared spectrum characteristic peaks of the components of the absorption medicine and prolonging the duration time of the mixing process, the mixing uniformity change condition of the absorption process is comprehensively reflected, an absorption end point is accurately judged, and a comprehensive and reasonable basis is provided for actual production of the absorption medicine.

Description

technical field [0001] The invention relates to an online determination method for the absorption end point of a typical modified double-base propellant absorbent drug, and belongs to the technical field of propellant detection technology. Background technique [0002] A typical modified double-base propellant is a propellant composed of nitrocellulose (NC), nitroglycerin (NG), aluminum powder, RDX and water. Its preparation process is mainly composed of absorption, mixing, calendering, drying and other processes. Absorption refers to suspending nitrocellulose in the dispersion medium, and through a certain dispersion method, the components of the double-base propellant are uniformly and accurately mixed together and firmly combined. The higher the uniformity of drug absorption, the better the absorption effect. The absorption effect of the absorbent drug directly plays a decisive role in whether the finished propellant can achieve the theoretical performance of the formul...

AI Technical Summary

Problems solved by technology

[0006] Although the MBSD algorithm can effectively reflect the system changes in the mixing process in real time, there are two problems in the operation process of the above experiment: (1) The MBSD algorithm is used in this experiment to use the overall spectral information and the entire spectral band range Internally, the three consecutive spectral lines are biased, and the experimental environment is a large amount of water. The existence of a large amount of liquid water peaks will cover the characteristic peaks of the main components of the absorbent, and it is impossible to characterize the characteristic peaks of the absorbent itself that change with the mixing process. However, it cannot reflect the characteristic peak bands of components such as RDX and NC, which will virtually bring errors to the experimental results. Therefore, it is difficult to fully reflect the changes in the mixing uniformity of components such as RDX and NC in the absorption drug; (2 ) In this experiment, only the spectral difference within 200s is used to plot the change of S over time, and it is determined that the absorption end point is reached at about 121s, while the actual propellant factory produces absorption drugs generally above 2h, therefore, the absorption end point time in the experiment It is far from the actual situation, it is difficult to objectively reflect the real situation of the absorption process, and the obtained laws are not enough to support practical application

Images