Research on Blast Wave Pressure Engineering Measurement Uncertainty Evaluation Based on Joint Calibration

For blast wave pressure measurement in explosion fields, conventional static-based uncertainty evaluation ignores factors including parasitic effects and engineering installation. This paper presents an engineering uncertainty evaluation method based on joint calibration, combining quasi-static calibration and dynamic calibration. Engineering measurement uncertainty is decomposed into four components: instrument metrological performance, parasitic effects, engineering installation, and dynamic calibration. Thermal and vibration simulation, blast wave reflection theory and grey system theory are applied to assess each component respectively, followed by the synthesis of standard and expanded uncertainty. Tests were performed on the measurement system equipped with a PCB 113B24 sensor yield with an expanded uncertainty of 9.8% for a coverage factor of k = 2, which meets the engineering accuracy requirement ranging from 8% to 10%. Dynamic calibration uncertainty dominates total uncertainty, followed by engineering installation and parasitic effect uncertainty, while instrument related uncertainty is minimal. Finally, the corresponding improvement strategies are proposed to further enhance the measurement accuracy. This work provides theoretical and technical support for the formulation of specifications for blast wave measurement uncertainty evaluation and explosion damage assessment.