期刊名称：Scientific Journals of the Maritime University of Szczecin
印刷版ISSN：1733-8670
电子版ISSN：2392-0378
出版年度：2004
卷号：1
页码：57-66
语种：English
出版社：MUS
摘要：A self–oscillating ultrasonic system is suggested for monitoring deformations in ship hulls.The system employs high frequency (about 1 MHz) ultrasounds exciting the hull material.Stress changes manifest themselves in small but detectable variations of frequency in the self–oscillating system.The suggested system can be applied for continuous stress changes monitoring in high seas as well as in nearly fully laden ship conditions.
其他摘要：The quality parameters of printed impressions obtained via duplex printing on a sheet–fed offset press were studied in the article.The efficiency improvement of a sheet–fed offset press is achieved by using turning pages devices.The quality of a printed impression is affected by many factors,one of which is the duplex printing press construction,such as printing cylinder,on which,when turning,a metal plate is mounted to protect the printed image.Disability and acce lerated failure during operation are the result of processes that occur in the surface layers.Thus the analysis of the research of the printed impressions’ parameters is relevant considering the application of the finishing–strengthening treatment by rolling vibration and the followed chrome coverage of an impression cylinder,which increases the performance properties due to the formation of a regular microrelief of the chrome surface of an impression cylinder and maintaining the quality of a printed impression within the standardized values.
关键词：deformation measurements;self–oscillating systems
