矢量传声器在目标声源方位(Direction of Arrival,DOA)估计方面具有天然的优势性能。在单矢量传声器实现目标声源DOA估计的基础上,利用交叉定位的思想推导多矢量传声器融合实现目标定位的模型,并给出模型的总体最小二乘解。针对奇异方...矢量传声器在目标声源方位(Direction of Arrival,DOA)估计方面具有天然的优势性能。在单矢量传声器实现目标声源DOA估计的基础上,利用交叉定位的思想推导多矢量传声器融合实现目标定位的模型,并给出模型的总体最小二乘解。针对奇异方位角影响估计精度的问题,利用圆概率偏差确定有效方位角后再进行融合定位。仿真分析与定位验证实验的结果表明,该方法可以实现目标声源位置估计,在消声室环境下具有较好的定位精度,有效性和实用性较强。展开更多
提出一种基于声源空间域分布稀疏和声学矢量传感器“8”字形指向特性的波达方向(Direction of Arrival,DOA)估计方法。该方法在通过最优化稀疏算法选择与声源方向最匹配的向量的同时,借助声学矢量传感器中组合声矢量信号独特的“8”字...提出一种基于声源空间域分布稀疏和声学矢量传感器“8”字形指向特性的波达方向(Direction of Arrival,DOA)估计方法。该方法在通过最优化稀疏算法选择与声源方向最匹配的向量的同时,借助声学矢量传感器中组合声矢量信号独特的“8”字形指向性,进一步提升了单个声学矢量传感器测向的准确度。实验结果表明,所提方法在宽带信号短时、小快拍情形下具备较强的健壮性,能够有效抑制噪声并准确获得噪声源的空间位置,为后续的噪声控制与处理提供关键的基础信息,有助于提高噪声处理的性能和效果。展开更多
The air spring is a non-metallic spring device that utilizes the deformation of flexible materials and the compression of air to generate restoring force, achieving vibration damping and buffering effects. It features...The air spring is a non-metallic spring device that utilizes the deformation of flexible materials and the compression of air to generate restoring force, achieving vibration damping and buffering effects. It features height adjustment and highfrequency vibration isolation. Air springs exhibit significant viscoelastic and memory characteristics. Traditional dynamic models of air springs are complex and unable to accurately describe their viscoelastic properties. This paper introduces fractional calculus theory to study them. Through experimental research on air springs, test data are analyzed to obtain their mechanical properties under different working conditions. A fractional-order nonlinear dynamic model of the air spring is established, and the model parameters are identified using the least squares method. The experimental data are fitted to verify the model's accuracy.展开更多
文摘矢量传声器在目标声源方位(Direction of Arrival,DOA)估计方面具有天然的优势性能。在单矢量传声器实现目标声源DOA估计的基础上,利用交叉定位的思想推导多矢量传声器融合实现目标定位的模型,并给出模型的总体最小二乘解。针对奇异方位角影响估计精度的问题,利用圆概率偏差确定有效方位角后再进行融合定位。仿真分析与定位验证实验的结果表明,该方法可以实现目标声源位置估计,在消声室环境下具有较好的定位精度,有效性和实用性较强。
文摘提出一种基于声源空间域分布稀疏和声学矢量传感器“8”字形指向特性的波达方向(Direction of Arrival,DOA)估计方法。该方法在通过最优化稀疏算法选择与声源方向最匹配的向量的同时,借助声学矢量传感器中组合声矢量信号独特的“8”字形指向性,进一步提升了单个声学矢量传感器测向的准确度。实验结果表明,所提方法在宽带信号短时、小快拍情形下具备较强的健壮性,能够有效抑制噪声并准确获得噪声源的空间位置,为后续的噪声控制与处理提供关键的基础信息,有助于提高噪声处理的性能和效果。
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 12072206 and U1934201)Science and Technology Project of Hebei Education Department of Hebei Province, China (Grant No. QN2024254)。
文摘The air spring is a non-metallic spring device that utilizes the deformation of flexible materials and the compression of air to generate restoring force, achieving vibration damping and buffering effects. It features height adjustment and highfrequency vibration isolation. Air springs exhibit significant viscoelastic and memory characteristics. Traditional dynamic models of air springs are complex and unable to accurately describe their viscoelastic properties. This paper introduces fractional calculus theory to study them. Through experimental research on air springs, test data are analyzed to obtain their mechanical properties under different working conditions. A fractional-order nonlinear dynamic model of the air spring is established, and the model parameters are identified using the least squares method. The experimental data are fitted to verify the model's accuracy.
