Machine Gun System Modal Testing And Analysis

With the rapid development of science and technology, the weapons of modern warfare request new tactical and technical requirements. In order to improve the mobility and flexibility of military operations and increase the lethality of weapons,countries in the world are reducing the weight of weapons significantly, meanwhile, the good shooting accuracy and great power are required. So, researches on the structures of weapons and the dynamic matching between them are very important. Experimental modal analysis is an effective way to acquire the dymanic characteristics of the machine-gun systemIn this article, experimental modal analysis and calculating modal analysis were comprehensively used to study the dymanic characteristics of the system of machine gun.The machine gun's 3D model was established by measurement. After simplifying and modifying the modal's detail, the 3D modal was imported into ANSYS,in which the model was meshed and a reasonable finite element model of the machine gun was obtained.The parameters of the vibration characteristics of the machine-gun system including frequencies and modes were acquired by calculation. The experimental mode measurement system of machine-gun was established. Based on the method of calculation mode analysis, the placement of the exciting points and mearsure points were arranged. The modal experiments of M60 and some 5.8mm general machine gun were conducted.By the analysis and summary of the modal parameters, some reasonable suggestions were put forward to modify the structure of the machine-gun. Additionally, the dymanic characteristics of two general machine guns were compared, and the influence of weight reduction upon the modal parameters was analysed.