过程控制

Time-delay problem was hard to be avoided in many occasions of industrial process control and network transportation. It was a severe disadvantage for control performance especially in input aslant systems.

时延问题在工业过程控制以及网络传输中难以避免，严重影响控制效果，尤其对于输入信号变化较大的控制过程，危害更加严重。

The article describes a process control system based on ethernet and fieldbus technology. This system can complete parameter control, storage and analysis, such as temperature, pressure, flow rate and level. In the process of control, we use PID algorithm and realize isobaric water supply, then complete the stabilization of water tank.

利用以太网，结合西门子现场总线搭建了过程控制平台，完成了对温度、压力、流量和液位这些典型过程参数的采集、存储和分析，并利用PID算法通过对变频器、电控阀门的控制，实现恒压供水任务，进而完成对于水箱液位稳定的控制。

Process Control Systems; safety analysis ; control logic ; Process Control Event Diagram

国防科技大学信息系统与管理学院；过程控制系统；安全分析；控制逻辑；过程控制事件框图

Quality control ; statistical process control ; multivariable control system ; Markov process

质量控制；统计过程控制；多变量控制系统； Markov过程

Network and dynamic modeling setup technology is used into the construction quality management of enterprise in this paper,enterprise can supervise the construction quality of subordinate project department,set up a dynamic model for quality management,so that they can reinforce the process control of quality management of their project,improve the quality of their product.

产品质量是每个企业立足的根本，大型建筑企业由于其下属工程项目众多，如何在工程施工过程中，对下属项目进行质量监督和产品质量的过程控制，是目前大型建筑企业需要解决的问题。由于建筑业的特殊性，建筑产品必须百分之百合格，这就要求我们加强建筑产品质量的过程控制；由于建筑产

Product and process control: SPC control, preshipment sample audit and manufacturing process audit.

产品及生产过程控制：统计生产过程控制，出货前抽查和制造过程抽查。

We claim all sidedness and entirety and procedure of cost control, and the text put forward that cost prediction and cost planning and cost control in the cost process control should take turns as well as a rolling closed loop movement.

要求成本控制的全面性、整体性和过程性，提出了成本预测、成本计划和成本实施控制在成本过程控制中既是依次进行时，又是周而复始的闭环运动。

Mainly presents the main quality control elements in delayed coking tower manufacturing process,such as prefabricating,constituting and welding,and presents quality control methods in practical manufacturing procedure,to guarantee the equipment quality to satisfy design and operating requirements.

主要介绍延迟焦化装置焦炭塔的预制、组对、焊接过程中主要质量控制环节，并结合实际介绍了所采取的质量控制措施，通过加强过程控制确保设备制造质量，以满足设计及使用要求。

The experiment and the research indicate that:(1) Through the Hot-Continuous-Rolling production technics under small reduction ratio of 4.04 and 5.08, the rectangular continuous-casting billet of 235×265mm can be used to produce big size steel stick of Φ140mm and Φ 125mm whose macrostructure and mechanical properties meet the standards, this technics is viable;(2) This rolling technics can make the deformation penetrate to the center of the billet by low temperture and low velocity and big roller diameter and large reduction quantity at every pass and optimum design and arrangement of rollers, which is the key of Hot-Continuous-Rolling technics under small reduction ratio;(3) The sending technics used in Xining Special Steel Co.,Ltd can not use waste-heat of billet adequately, but the sensitive temperature section of A1N or sulphides or inclusions separating out is avoided, creating a favorablecondition for insuring good surface quality of final rolled steel;(4) The Hot-Continuous-Rolling technics under small reduction ratio has a close relationship with the billet quality control and the hot sending process control and the cooling control after rolling.

通过实验研究表明：(1) 235×265mm矩形连铸坯分别采用4.04和5.08的小压缩比热连轧生产工艺，所生产的Φ140mm和Φ125mm的大规格棒材，其低倍组织和机械性能均符合标准要求，该工艺是可行的；(2)本实验所采取的低温低速、大辊径大道次压下量轧制工艺加上轧辊孔型的优化设计与配置，可以使加工变形渗透到铸坯的中心，这一点是实现小压缩比热连轧生产工艺的关键；(3)西宁特钢在红送过程中虽然铸坯余热未能得到充分的利用，但是有效地避开了A1N、硫化物的析出及夹杂物偏析的敏感温度区，为保证最终轧材良好的表面质量创造了有利的条件；(4)小压缩比热连轧生产与铸坯质量控制，热送过程控制以及轧后冷却控制密不可分。

The quality control is an integral part of the quality management, which is engaged in meeting the quality requirements covering process control, take-over control and process improvement.

质量控制是质量管理的一个部分，致力于满足质量要求，包括过程控制、验收控制和过程改进。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。