Research And Implementation Of Underground Damage Target Positioning

The underground damage target is mainly represented by the ground-penetrating projectile.The determination of the location of the underground explosion center is a crucial part of the trajectory research of the ground-penetrating projectile,the shape design of the projectile and the evaluation of the elastic energy index of the earth-boring.It has a very important position in the field of national defense science and technology.In order to achieve the purpose of positioning the underground explosion center of the underground damage target,this paper uses the test system to collect the vibration signal generated by the underground explosion.Based on the seismic positioning theory and the distributed test principle,the underground damage target location test method is studied.The main contents include the following:Firstly,the applicability of seismic location principle to the location of underground damage targets is analyzed,and the specific calculation methods of seismic distance,source azimuth and seismic depth are determined.The LS-DYNA finite element simulation software is used to simulate the underground damage process.The simulation data is used to verify the applicability of the location method to the underground damage target.The test point selection method is discussed.It is concluded that the test points should surround the epicenter in all directions and close to the epicenter position to reduce the test error,the weighted idea is used to determine the optimal test point distribution and improve the accuracy of the positioning method.In addition,the underground explosion process of underground damage weapons under different intrusion angles is simulated,and the applicable range of the positioning method proposed in the article is broadened.Second,design and development of a test system for collecting three-axis acceleration signals.The test system consists of an acceleration intelligent sensor module,an FPGA control module,and a storage module and a USB serial communication module.After the dataacquisition is completed,the digital signal is introduced into the host computer,and the minimum is utilized.The multiplication method fits the acquisition signal and displays it on the host computer,and the corresponding PC software design is done.In addition,in order to make the collected signal more in line with the actual situation to improve the positioning accuracy,an improved EMD Denoising algorithm suitable for nonlinear signals is proposed.The reliability of the algorithm is verified by simulation experiments,and it is successfully applied in the vibration signal Denoising processing.In this paper,the related research theories of underground damage target location are analyzed and discussed.Combined with the distributed test principle,a set of positioning methods for determining the location of the explosion center is obtained.The finite element simulation is used to verify the application of the location method to this research topic.Combined with the distributed test principle,gives the optimal test point distribution.The test system and supporting software were designed and developed,and a series of post-processing analysis was performed on the acquired signals.