The Mechanism Study Of Ultrosonic Cleaning Of Attachments In Gun Bore

In modern national defense weapons and equipment,artillery still occupies an extremely important position.After the projectile is launched,some difficult-to-clean attachments will remain on the inner wall of the barrel,which will affect the firing accuracy and life of the artillery.Therefore,an efficient and portable cleaning equipment is urgently needed.Ultrasonic cleaning technology has been widely used in machinery and electronics,aerospace,medical and health and other fields.The cavitation effect of ultrasound plays a leading role in low-frequency ultrasonic cleaning,but the theoretical research on its specific working mechanism is not systematic.In this paper,ultrasonic cleaning technology is applied to the cleaning of gun barrel attachments,and its cleaning mechanism is deeply studied to obtain the best ultrasonic sound field parameters,and at the same time provide guidance for the design of ultrasonic cleaning modules.Firstly,a high-power ultrasonic transducer is used to carry out an exploratory cleaning experiment of gun barrel attachments.It mainly studies the impact of the distance between the transducer and the inner wall of the gun barrel and the cleaning time on the cleaning effect of the gun barrel,and it is practically feasible that applying ultrasonic cleaning technology to clean the gun barrel attachments.At the same time,the launching process of the cannonball was studied,the formation process of the barrel attachment was summarized,and the fatigue failure model of the gun barrel attachment was established based on the basic theory of material mechanics.Secondly,based on the classical wave propagation theory and basic sound wave theory,the sound field distribution model of the ultrasonic transducer is established.Numerical analysis and software simulation methods are used to study the near-field and far-field sound pressure and sound intensity distribution of the ultrasonic transducer.Combined with exploratory experiments,it is determined that the ideal ultrasonic frequency range and sound pressure and sound intensity range to achieve good cleaning effect.Thirdly,based on the classical bubble dynamics theory,it is studied the movement law of the cavitation bubble in the cleaning medium under the specific sound field condition,and it is also explored the influence of initial radius of the bubble and the excitation sound pressure on the bubble movement process.The Bernoulli equation is used to estimate the intensity of liquid impact force generated when the ultrasonic cavitation bubble collapses.So it is established that the link between transducer sound field and the fatigue strength of the attachment,and the feasibility of using ultrasonic to clean the attachments in the gun barrel is theoretically explained.Finally,based on the dynamic equation of the one-dimensional variable crosssection vibrating rod,the conditions for the size design of the transducer horn to achieve the maximum output are derived,and the ultrasonic cleaning module that meets the requirements is designed according to the conclusions drawn from the cleaning mechanism research,which is verified by the software simulation analysis.