A near-field vector sensing (VS) strategy is developed for three-dimensional (3D) large-scale hybrid sound absorption based on a lightweight structure. By simultaneously detecting sound pressures and normal particle velocities at discrete positions on the absorbing surface, the reflected sound power is minimized to obtain the optimal secondary excitation. For the one-dimensional case, low-frequency quasi-perfect absorption could be realized by one-point VS. For the 3D case (at the incident angle of 20), the optimized two-point VS is able to realize commendable broadband absorption from 50 to 800 Hz and extraordinary absorption between 50 and 300 Hz.

中文翻译：

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一种用于三维大尺度混合吸声的近场矢量传感策略

近场矢量传感 (VS) 策略被开发用于基于轻量级结构的三维 (3D) 大规模混合吸声。通过同时检测吸收表面离散位置的声压和法向粒子速度，反射声功率被最小化，以获得最佳的二次激发。对于一维情况，可以通过单点VS实现低频准完美吸收。对于 3D 情况（入射角为 20°），优化后的两点 VS 能够实现 50 至 800 Hz 的出色宽带吸收和 50 至 300 Hz 的非凡吸收。