针对焊接缺陷超声检测中信号处理的特征提取问题，应用高阶谱方法对三类压力容器焊接缺陷的超声回波信号进行了分析。
The ultrasonic echoes of welding flaws for three types of pressure vessel are analyzed for feature extraction of signal processing using higher-order spectrum method.
公司于1984年首批取得三类压力容器设计和制造许可证，在非标压力容器设计和制造方面有雄厚的技术实力和装备优势。
A was amongst the first to obtain the design and manufacturing licenses for three-category pressure vessels from the Government in 1984.
2007年通过了中国特种设备检验协会的现场鉴定和评审，取得了三类(A 2级)压力容器的制造许可证。
In 2007, it passed the identification at site and assessment by the Chinese Association of special equipment test, and has acquired three categories (A2 level) pressure vessel manufacturing license.
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