Research On Dynamic Calibration And Measurement Uncertainty Evaluation Method Of Underwater Shock Wave Pressure Measurement System

The magnitude of the underwater explosion shock wave pressure is one of the key evaluation indicators to evaluate the underwater explosive power of different explosives and analyze the ship's anti-knock ability.According to the test environment,it can be divided into two types: wall reflection pressure and free field pressure.The underwater shock wave pressure signal has a wide frequency range.Generally,modular pressure sensors are used for measurement.From the application range of piezoelectric pressure sensors,the dynamic calibration of underwater shock wave pressure sensors mainly uses the standard material method.This method The theoretical value is mainly calculated based on the composition,mass of the standard charge column and the empirical formula of the underwater explosion,and is used to calibrate the calibration results.The method takes into account the actual underwater explosion conditions,the error conversion of the results calculated by the empirical formula,and the measurement value does not have traceability,which cannot guarantee the accuracy of the dynamic calibration results.It is a typical dynamic pressure signal.In order to characterize the underwater shock wave pressure measurement results,the uncertainty of the underwater shock wave pressure measurement system is evaluated by using the "static instead of dynamic" method,that is,the static operating characteristics of the measurement system are used to evaluate the dynamic measurement.Value,especially using static sensitivity.In the actual underwater shock wave pressure signal measurement process,there is a contradiction between the static sensitivity of the system and the actual dynamic sensitivity.Therefore,the uncertainty evaluation method based on the static motion is aimed at the current dynamics of underwater shock wave pressure measurement systems.The shortcomings of calibration and uncertainty evaluation,this paper proposes a dynamic calibration method and uncertainty evaluation method of pressure sensors based on the pre-pressure water shock tube.This paper studies the characteristics of pressure signals of underwater explosion shock waves and actual operating conditions propose a pressure sensor comparison dynamic calibration method based on pre-pressurized water shock tube studies the factors affecting the dynamic characteristics of the sensors and establishes standard pressure.Monitoring system,and analyzed the factors affecting the uncertainty of the standard pressure monitoring system,and evaluated the uncertainty of the standard pressure detection system;verified the consistency of the measurement results of the dynamic measurement system for underwater shock wave pressure,and studied the dynamic characteristics of the pressure sensor Obtain the method,and take the Kistler 6215 pressure sensor as an example,and carry out a dynamic calibration experiment using the comparison calibration method to obtain the dynamic characteristics of the underwater shock wave pressure sensor;Based on the characteristics,a single-frequency point uncertainty evaluation method for the sensitivity of the calibrated pressure sensor based on the gray system theory is proposed,and the applicability analysis of the uncertainty gray evaluation method for a small sample is performed.The degree to predict and sort out the pressure of being calibrated Other sensors uncertainty components,the system is dynamic measurement uncertainty evaluation typical underwater shock pressure.The research results of this paper provide a certain theoretical basis and experimental support for the dynamic calibration method and measurement uncertainty evaluation method of underwater shock wave pressure sensors and have certain reference value for the establishment of the dynamic measurement uncertainty specification of underwater shock wave pressure sensors.