To quantitatively study the location errors induced by deviation of sonic speed, the line and plane location tests were carried out. A broken pencil was simulated as acoustic emission source in the rocks. The line and...To quantitatively study the location errors induced by deviation of sonic speed, the line and plane location tests were carried out. A broken pencil was simulated as acoustic emission source in the rocks. The line and plane location tests were carried out in the granite rod using two sensors and the cube of marble using four sensors, respectively. To compare the position accuracy between line and plane positions, the line poison test was also carried out on the marble surface. The results show that for line positioning, the maximum error of absolute distance is about 0.8 cm. With the speed difference of 200 m/s, the average value of absolute difference from the position error is about 0.4 cm. For the plane positioning, in the case of the sensor array of 30 cm, the absolute positioning distance is up to 8.7 cm. It can be seen that the sonic speed seriously impacts on the plane positioning accuracy. The plane positioning error is lager than the line positioning error, which means that when the line position can satisfy the need in practical engineering, it is better to use the line position instead of the plane location. The plane positioning error with the diagonal speed is the minimum one.展开更多
针对平面麦克风阵列的声源三维坐标估计问题,文中在TDOA(Time Difference of Arrival)声源定位算法中引入粒子群优化算法进行位置估计。利用PHAT(Phase Transform)加权函数的广义互相关法计算得到时延差的真实值,结合麦克风的坐标位置,...针对平面麦克风阵列的声源三维坐标估计问题,文中在TDOA(Time Difference of Arrival)声源定位算法中引入粒子群优化算法进行位置估计。利用PHAT(Phase Transform)加权函数的广义互相关法计算得到时延差的真实值,结合麦克风的坐标位置,通过几何关系计算出假设声源到达麦克风之间的时延差的估计值。设计时延真实值和估计值差值的平方和为粒子适应度函数,利用粒子群优化算法搜索空间中符合适应度函数的声源点,实现声源位置估计。仿真结果表明,在计算速度与球形插值法相近的情况下,文中所提算法比球形插值法具有更好的鲁棒性和抗噪性。展开更多
基金Projects (50934006, 10872218) supported by the National Natural Science Foundation of ChinaProject (2010CB732004) supported by the National Basic Research Program of ChinaProject (kjdb2010-6) supported by Doctoral Candidate Innovation Research Support Program of Science & Technology Review, China
文摘To quantitatively study the location errors induced by deviation of sonic speed, the line and plane location tests were carried out. A broken pencil was simulated as acoustic emission source in the rocks. The line and plane location tests were carried out in the granite rod using two sensors and the cube of marble using four sensors, respectively. To compare the position accuracy between line and plane positions, the line poison test was also carried out on the marble surface. The results show that for line positioning, the maximum error of absolute distance is about 0.8 cm. With the speed difference of 200 m/s, the average value of absolute difference from the position error is about 0.4 cm. For the plane positioning, in the case of the sensor array of 30 cm, the absolute positioning distance is up to 8.7 cm. It can be seen that the sonic speed seriously impacts on the plane positioning accuracy. The plane positioning error is lager than the line positioning error, which means that when the line position can satisfy the need in practical engineering, it is better to use the line position instead of the plane location. The plane positioning error with the diagonal speed is the minimum one.
文摘针对平面麦克风阵列的声源三维坐标估计问题,文中在TDOA(Time Difference of Arrival)声源定位算法中引入粒子群优化算法进行位置估计。利用PHAT(Phase Transform)加权函数的广义互相关法计算得到时延差的真实值,结合麦克风的坐标位置,通过几何关系计算出假设声源到达麦克风之间的时延差的估计值。设计时延真实值和估计值差值的平方和为粒子适应度函数,利用粒子群优化算法搜索空间中符合适应度函数的声源点,实现声源位置估计。仿真结果表明,在计算速度与球形插值法相近的情况下,文中所提算法比球形插值法具有更好的鲁棒性和抗噪性。
