基于线性调频高斯函数的自适应时频分布     

马世伟  陈光化  邓家梅  曹家麟 《上海大学学报(英文版)》2000,4(1):31-37

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　ＴｉｍｅｆｒｅｑｕｅｎｃｙａｎａｌｙｓｉｓｍｅｔｈｏｄｓｓｕｃｈａｓｓｈｏｒｔｔｉｍｅＦｏｕｒｉｅｒｔｒａｎｓｆｏｒｍ(ＳＴＦＴ),Ｇａｂｏｒｅｘｐａｎｓｉｏｎ,ｗａｖｅｌｅｔｔｒａｎｓｆｏｒｍａｎｄＷｉｇｎｅｒＶｉｌｌｅｄｉｓｔｒｉｂｕｔｉｏｎ(ＷＶＤ)ｈａｖｅｂｅｅｎｅｘｔｅｎｓｉｖｅｌｙｓｔｕｄｉｅｄａｎｄｉｍｐｌｅｍｅｎｔｅｄ.Ｔｈｅｙｐｒｏｖｉｄｅｅｆｆｅｃｔｉｖｅｔｏｏｌｓｆｏｒａｎａｌｙｚｉｎｇｓｉｇｎａｌｐｒｏｐｅｒｔｉｅｓｉｎｊｏｉｎｔｔｉｍｅｆｒｅｑｕｅ…  相似文献   

严寒地区节能住宅顶层墙体裂缝分析与防治措施     

崔岩夏露  马世伟 《黑龙江科技信息》2004,(5):112-112

本文对严寒地区节能住宅顶层墙体裂缝原因进行了分析。经分析认为，冻胀力、温度应力是引起墙体裂缝的主要原因，同时提出了防止裂缝的措施和方法。  相似文献   

Evaluation of fracture damage of SUS306 structural steel using ultrasonic testing     

马世伟  袁康  张浩  韦习成 《上海大学学报(英文版)》2009,13(4):279-282

High frequency ultrasonic nondestructive testing was conducted using a direct contact method for SUS306 stainless steel treated by high temperature and fracture tensile tests. Reflected ultrasonic echoes were analyzed. The relationships between the ultrasonic attenuation coefficient, strength of backscattering wave and the elongation at break of the samples were obtained. The damages were evaluated by using these results together with the analysis of microstructure and mechanics of the tested material. Project supported by the National Natural Science Foundation of China (Grant No.60472102), and the Innovative Program of Shanghai Municipal Education Commission (Grant No.07ZZ03)  相似文献