Research On Environmental Adaptability Calibration Method Of Internal Ballistic Pressure Test System

The internal ballistic pressure test system includes chamber pressure test systems and bullet bottom pressure test systems.The test objects are the chamber pressure generated by the burning of gunpowder and the bottom pressure acting on the bottom of the projectile.The measurement results are used to evaluate the design and verification of the artillery.However,the actual use environment of the internal ballistic pressure equipment is extremely harsh,the calibration results in an ideal laboratory environment cannot meet the needs of the actual use environment,and the test accuracy is severely affected.In response to this problem,an environmental adaptability calibration technique for simulating harsh environments was proposed,a simulated gun pressure generator for simulating the internal ballistic pressure of artillery was developed,and an environmental adaptability calibration system was established to ensure the test system's working reliability and accuracy of test results under the harsh conditions such as high temperature,high pressure,and high impact.This article has made detailed exploration and research on the environmental adaptability calibration method,mainly elaborating the following four aspects:First,the pulse calibration principle and quasi-static calibration principles of ballistic pressure test system are studied in detail;based on the consideration that the instrument system used in the harsh environment needs to be calibrated and evaluated in a similar harsh environment,an environmentally adaptable calibration method is proposed,and the environmental factors of the internal ballistic process of the artillery is analyzed.Secondly,in response to the problems of low calibration efficiency and difficulties of high pressure in existing static calibration equipment,a hand-operated pressure generator based on the principle of a screw rod propulsion pressure was designed and developed to research the static characteristics of sensors.Thirdly,the environmental adaptability calibration principle and calibration technology of the internal ballistic pressure test system are studied,the calibration process is determined and the calibration rationality is analyzed in detail.In view of the calculation limitations of the weighted average data fusion method based on the weighting of the sensor test accuracy,a Bayesian estimation method that fully considers the statistical law is proposed to perform data fusion on the test data,and an experimental analysis is carried out to compare the improvement effects of the data fusion method.Finally,the waveform adjustment method of the simulated chamber pressure generator is studied.From the perspective of theoretical calculation,simulation analysis and test verification,the effects of the gunpowder charge,the thickness of the diaphragm and the installation direction of the diaphragm on the generated waveform are characterized.After processing the test data,the empirical formulas of various influencing factors are summarized to guide the waveform adjustment.