基于点云数据重构的扩径管道直径、圆度检测系统

不同规格尺寸管道在扩径过程中,无法对其直径及圆度进行快速、精准检测,为此,提出了一种基于点云数据重构的扩径管道直径及圆度精准检测方法。首先,搭建了一种基于点云数据重构的扩径管道直径及圆度精准检测系统,并对系统的不确定度进行了分析;然后,分析了激光线扫描传感器的成像及标定原理,并通过标定块对系统进行了标定;最后,进行了不同规格尺寸管道直径及圆度在线检测实验,对采集到的点云图像进行了去噪、拼接处理,并对拼接重构后的精度进行了分析研究。研究结果表明:针对400 mm、1000 mm和1600 mm 3种规格尺寸的管道,该系统均能实现直径及圆度的精准测量,直径及圆度最大误差分别不超过0.266 mm和0.427 mm,最大重复性误差分别为0.130 mm和0.170 mm;该结果表明,采用该方法可满足扩径管道的加工需求,为不同规格尺寸管道扩径过程中直径及圆度的精准、快速检测,提供了一种有效的技术手段。

Sensitivity and Uncertainty Analysis of Regional Marine Ecosystem Services Value

Marine ecosystem services are the benefits which people obtain from the marine ecosystem,including provisioning services,regulating services,cultural services and supporting services. The human species,while buffered against environmental changes by culture and technology,is fundamentally dependent on the flow of ecosystem services. Marine ecosystem services become increasingly valuable as the terrestrial resources become scarce. The value of marine ecosystem services is the monetary flow of ecosystem services on specific temporal and spatial scales,which often changes due to the variation of the goods prices,yields and the status of marine exploitation. Sensitivity analysis is to study the relationship between the value of marine ecosystem services and the main factors which affect it. Uncertainty analysis based on varying prices,yields and status of marine exploitation was carried out. Through uncertainty analysis,a more credible value range instead of a fixed value of marine ecosystem services was obtained in this study. Moreover,sensitivity analysis of the marine ecosystem services value revealed the relative importance of different factors.

赛宝计量检测中心两项课题通过鉴定验收

2004年2月23～25日，受信息产业部科技司委托，部计量管理办公室在广州电子601计量站主持召开了《军用电子元件阻抗标准系列研究》项目技术鉴定会。