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The balancing force of the interior ballistics is an important issue in the design of the recoilless gun. It has been found in practice that the balancing force design method for recoilless guns based on the traditional classical interior ballistic theory cannot guide the balance from the physical mechanism and process. In order to study the unbalanced force experienced by the recoilless gun during the firing of the projectile and the variation law of its various parameters with time, the analysis and calculation method of the balanced interior ballistics is proposed in this article. This method separately models the aerodynamic and propellant combustion processes of the recoilless gun, using the characteristic line method to solve the model numerically. This method can be used to predict the change of the unbalanced force acting on the recoilless gun during the projectile firing of the recoilless gun. The reliability of the algorithm is verified by the interior ballistic performance when China 78 type 82 mm recoilless smoothbore gun launches the projectile. The study found that the unbalance impulse generated by the gas inside the barrel fired by the recoilless gun accounts for only 1.5 % of the total recoil impulse, but it has a great influence on the amount of impulse a shooter has can take. This approach provides a better understanding of this complex internal ballistic process, which has important implications for the design and improvements of recoilless guns. [ABSTRACT FROM AUTHOR]

Interior ballistics experiment is an indispensable link in the experimental teaching of weaponry in colleges and universities.Because of the risk of experimentation, the rapidity of the process, and the high cost of equipment, it is difficult to develop the interior ballistics in the actual teaching process. Taking the two typical experiments of projectile muzzle velocity test and rolling test as examples, the virtual reality technology was introduced into the traditional interior ballistics experiment, and an image and intuitive real-time virtual experiment scenario was established. The actual physical process was simulated through the calculation of interior ballistic simulation. Using the Unity3 D engine, an interior ballistic virtual experiment system with good visual immersion and interactivity has been developed. The teaching practice of the Weapons Virtual Simulation Experimental Teaching Center of North University of China shows that the internal ballistic virtual experiment system saves experimental expenses, improves the flexibility of time and space, and has good practical and promotional value. [ABSTRACT FROM AUTHOR]

From 16th to 19th century there is an intensified intercommunion for the technology of artillery-making and applying for guns between West and China through introducing science and technology by Jesuits. During this transmission, western knowledge of ballistic was introduced and combined with traditional Chinese knowledge and experiences, and this was reflected with concentration in the military books of Late Ming and Early Qing. This paper especially differentiates and analyses the description for trajectory knowledge in military books during this period from the aspect of terminology. Through analyzing the descriptions about devices for aiming, ballistic curve, and explanation for flight, the paper manifests that China of Late Ming and Early Qing inherited qualitative description for traditional cast weapon with gun-powder, as well as absorbed western technology and theory for trajectory, hoping that it might be of help to reflect the development and the evolution of Chinese ballistics after the introduction of western ballistics into China since 16th century. [ABSTRACT FROM AUTHOR]