Design and Application of Passenger Body Pressure Acquisition System for Sled Testing
To meet the requirements of continuous and high-speed data acquisition of passenger body pressure under instantaneous and high-impact conditions in automotive collision sled tests,a high speed passenger body pressure collection system was designed based on STM32H723ZGT6 high-performance MCU and array pressure sensor,where the design scheme included high-performance hardware,local data acquisition,local storage,and post-experiment uploading.By applying high-performance microcontroller units and memory expansion,the real-time performance and stability of data collection have been improved.The data acquisition frequency for 4 576 force-sensitive points on both the seat cushion and backrest could reach 200 Hz,satisfying the data acquisition requirements for sled tests while also controlling system costs.Additionally,a passenger body pressure data analysis method based on single-channel image feature extraction was introduced.In rigid seat sled tests,data on passenger body pressure were collected from a volunteer under four different seat conditions.The passenger's pelvic displacement trajectory,maximum average rectangular window pressure,voltage variation trend,and weight change trends for the entire seat cushion and its three sub-regions were obtained and visualized.The obtained data characteristics are essentially consistent with the passenger posture responses obtained by the high-speed camera.
万方数据
维普
