The Moving Characteristics Analyse Of Underwater High Velocity Projectile And The Experiment Research

Experimental research on characteristic of underwater projectile motion is the current global hot spots, which expands the study of related fields of technology could bring to important social values and military significance.Paper has studied the damping properties of high speed underwater. From the development of underwater sensors, sensor calibration methods, projectiles and other aspects of the underwater movement of a detailed design, calculation and analysis, it lays the technical foundation of the design of underwater high-speed projectile. The paper did main work as follows:(1) According to the underwater motion of the typical projectile with high speed, both classical formula and dimension analysis were used to analysis the motion rule of typical projectile in different depth of water and displacement state, experimental models on velocity attenuation rule of high speed underwater projectile were established respectively on the two methods.(2) Through the test environment, characteristics of in-depth analysis, Measuring system on moving character of underwater projectile base on PXI was established which is based on deep water simulate target channel. PXI system, underwater coil target and photo-screen sensor. The power of using Labview7.1 achieve instrument parameter settings, the automatic data acquisition, real-time the signal processing and analysis and storage, display, printing, and the consistency of the measurement channels were calibrated research.(3) According to the characteristics and requirements of underwater projectile velocity, underwater speed sensor screens were designed and produced. Topics include:characteristics of a variety of source analysis, testing and comparison of the underwater light test device was constructed to determine the wavelength of 650run,70mW red semiconductor laser light source device as a system. Designed by the quartz rod. lens, screw the lens system composed of parallel light, and in the spiral lens aperture before the specially designed to ensure the consistency of flux changes. Designed by the receiving aperture, threaded lens, silicon photovoltaic cells integrated devices, optical signal conversion circuit, the current amplifier circuit, filter circuit, the voltage amplifier, the signal shaping circuit of the signal reception, conversion and conditioning circuitry, eliminating the interference signals on the test Adverse effects, has been used to trigger the timing device and to record the projectile through the target surface of the pulse signal time. Designed to withstand underwater case waterproof screens speed sensor, the device's shell has good compression, anti-sealing internal force response capabilities and performance, maximum operating depth of 40m, the maximum pressure is 0.6MPa.(4) Using the existing 4 sets of standard light screens and underwater screens speed sensor point simultaneous measurement of projectile velocity with the use of 4 sets of light screen average speed measured as the standard value, used to calibrate measurements of underwater light curtains Speed sensor, speed sensor analysis showed that speed underwater screens maximum relative standard uncertainty was determined to be r?1.27×10-3. Velocity measurement performance of underwater photo-screen sensor was assessed through simulating calibration and firing practice.Theoretical analysis and experiments show that live underwater, the system is reliable, high precision, fully meet the current needs of water-related research in the field.