A Line Array Camera-based Measurement Method for Dynamic Parameters of Underwater Projectiles and Supercavitation Evolution Process
To address the challenging underwater conditions,poor lighting,and difficulties in capturing and reconstructing the high-speed motion and supercavitation evolution of projectiles,a line array camera-based underwater projectile image acquisition system is designed.The system utilizes the principle of intersection measurement and incorporates a dual line array camera for image acquisition.An algorithm is proposed for underwater high-speed supercavitating target recognition and projectile shape reconstruction.The formulas for calculating the coordinates,attitude angles,and velocity of projectilepassing though a target are derived by using the geometric relationship of supercavitating projectile and the camera calibration data.A water entry experiment of projectiles vertically launched from a 12.7 mm smoothbore gun is conducted to validate and analyze the feasibility of the system.Experimental results demonstrate that the system can effectively and rapidly acquire the underwater projectile images,accurately separate and reconstruct the projectile shapes and cavity morphology,and calculate the underwater projectile's motion velocity,attitude angles,and supercavitation parameters.The velocity calculated by the system exhibits an error of less than 1％compared to the velocity obtained from concurrently deployed high-speed cameras,indicating the high reliability and practicality of the system.
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