板材自动厚度调节系统研究

本文通过以整个机架作为测量厚度的自动厚度调节系统的研究,讨论了轧制过程中油膜厚度变化对钢板厚度精度的影响,得出适合现场应用的油膜厚度计数学模型。然后进行数据采集与处理,证明该方法得到的模型具有足够高的精度。

配备自动厚度调节的电池极片轧制设备

针对电池极片轧制设备向高精度发展的趋势,将自动厚度调节系统(Auto Gap Control)引入其中。在AGC众多的实现方式中,采用了最先进的全液压伺服控制系统,加上在线测厚系统的配合,可以实现恒压力、恒间隙和定厚三种控制方式的自由切换。

基于模糊PI控制的火腿肠厚度自动调节系统

针对高温火腿肠人工摆箅工序效率低、平整度差、杀菌后弯曲率高等问题,设计了一种火腿肠厚度自动调节系统。由于被控系统具有线性特征,可以采用PID控制,但被控对象的数学模型无法确定,且生产要求系统超调量小,传统固定参数PID控制无法满足生产需求,提出了一种模糊PI控制器模型,根据调试经验确定模糊推理规则,通过模糊控制器输出调节PI参数,采用PLC实现了厚度自动调节算法,解决了高温火腿肠传统生产工艺弯曲率难以控制的难题。

Evaluation of corneal parameter changes under different accommodative stimuli with Scheimpflug imaging-based tomography

AIM:To evaluate the reliability of measurements of corneal changes with accommodation in healthy eyes using a Scheimpflug imaging-based system and how these measurements distribute in the normal population.METHODS:Prospective,non-randomized,comparative study including 27 healthy subjects(54 eyes),including emmetropia(13 eyes),myopia(17 eyes),hyperopia(4 eyes)and astigmatism(20 eyes)groups.In all cases,a complete eye examination was performed,including the analysis of corneal changes with different accommodative stimuli(+2.00,0.00 and-3.00 D)using the Pentacam AXL system.The investigation was structured in 2 phases:repeatability analysis and characterization of accommodation-related corneal changes in healthy populations.RESULTS:In the repeatability analysis,the index of height asymmetry(IHA)showed the greatest variability with the three accommodative stimuli,being the results for the rest of parameters acceptable.The group of emmetropes showed significant differences with accommodative changes in the position of maximum keratometry(Kmax;P<0.05),whereas in the astigmatism group,significant changes were not only observed in the position of Kmax,but also in minimum corneal thickness(MCT),corneal spherical aberration,and total and low order aberration root mean square(all P<0.05).Likewise,a significant difference was found in the displacement of the X position of Kmax with+2.00 D and-3.00 D in the myopia group(P=0.033)as well as in changes with+2.00 D and-3.00 D in the magnitude of the position vector of Kmax in the emmetropia group(P<0.05).No significant changes were found between accommodative stimuli in the displacement of coordinates of MCT(P≥0.109).CONCLUSION:The position of Kmax and MCT in healthy corneas can change significantly when presenting different accommodative stimuli using the accommodation mode of the Pentacam system,with different trends in these accommodation-related corneal changes between refractive errors.Likewise,the consistency of the measurements obtained with Scheimpflug has been confirmed.

热连轧AGC控制中活套补偿的两种观点

给出了热连轧精轧机组厚度调节过程中 ,压下频繁动作 ,对主速度活套系统进行补偿控制的两种观点、算法证明和实际应用结果。

浅谈提高热轧板带轧机刚度偏差符合率

轧机是钢铁企业生产板带不可或缺的一个生产单元。生产过程中,由于机架变形、衬板松动、使用磨损、长期遭受汽水腐蚀等原因,都会导致轧机刚度越来越差,最终导致生产时影响板带质量。轧机刚度是反映轧机结构性能的重要参数,轧机刚度对热轧板带的质量控制、板型控制、辊系的稳定性等方面有重要影响。轧机刚度可以为轧钢工艺的编制提供数据支撑,并且可以给自动化控制提供依据,因此对提高轧机刚度、改善轧机刚度的特性具有重要的意义。本次通过使用激光跟踪仪的空间测量,对轧机进行优化、控制、管理,根据现场实际情况,提高设备的性能,最大化提高轧机刚度的符合程度。

关于记忆合金在变体机翼上的应用设想

本文首先利用记忆合金丝的形状记忆效应,结合弹簧储能元件,设计了一种变高度单胞元结构,该单胞元结构具有主动、往复的高度调节功能。并将其应用到变体机翼的变厚度调节中。然后将变高度单胞元结构在空间内以一定规律进行生长,得到零泊松比多胞元结构,将其应用在变体机翼变厚度调节中,可以使机翼具有多点、多尺度的变厚度调节,使机翼可以在多种飞行环境中保持性能最优。