ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

In order to judge the degree of plant disease stress effectively and determine disease situation, according to plant acoustic emission phenomenon, cylindrical and spherical non-conformal acoustic holography experiment model was established based on the distributed source boundary point method near-field acoustic holography technology. Single sound source and double sound sources were simulated respectively. The parameters, such as the holographic cylindrical radius, the number of measuring points on the holographic face, the number of nodes on the reconstructed spherical surface, the distance from fictional special point sound source to nodes on the reconstructed spherical surface and so on should be adjusted to obtain the practicable experimental parameters. The simulation results showed that the method could identify and locate the position of the acoustic emission source accurately. According to the experimental parameters, the signal acquisition acoustic holography experiment system was established based on DSP, signal was analyzed and processed based on LabView software platform.