快响压力敏感涂料技术多频压力校验系统及应用研究

The dynamic pressure analysis capability of PSP (pressure sensitive paint) technology at high spatial resolution was constrained by multiple factors. Reliable dynamic data feedback was urgently required for its technological iteration. A multi-frequency pressure generator was designed and constructed based on the theory of rectangulawar resonant cavity. The spatiotemporal pressure of the first five low-frequency standing wave modes was numerically and experimentally studied using frequency domain analysis and PSP technology. The results showed that the installation position of the sound source could affect the excitation effectiveness of the standing wave mode. All theoretical standing wave modes can be excited while the installation position was located near the top corner of the wall. The real-time dynamic PSP results were severely affected by time-domain noise， resulting in poor reliability of quantitative results. The pressure measurement results based on phase averaging demonstrated that the constructed multi-frequency pressure generation system effectively achieved the excitation of standing wave modes and the formation of corresponding spatiotemporal pressures at the design frequency. Under single sound source input， spatiotemporal dynamic pressure with an amplitude of approximately 0.8 kPa can be generated. The ability of the typical PSP dynamic measurement system was verified， achieving a spatial resolution of 4 points per mm² and a measurement accuracy of 50 Pa in a dynamic pressure environment with a frequency of 1 192 Hz.