共查询到19条相似文献,搜索用时 366 毫秒
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根据辊型检测过程的特点及精度要求,提出了用反射式光纤传感器对辊型进行非接触式光电检测的方法。通过对轧辊表面反射光位置变化的精确测量,将轧辊半径的微小变化放大,并转化为与之有一定放大倍数关系的直线位移量,可实现辊型的高精度非接触式检测。根据检测原理对系统进行了软件仿真,结果表明,该方法可及时获得检测系统辊型的输出信号,并将检测数据以曲线形式自动描绘出辊型曲线。这是一种放大倍数高、成本低、易实现的高精度非接触式辊型检测方法。 相似文献
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四辊液压轧机轧辊偏摆导致辊缝变化将严重影响轧制成品厚度的精度。介绍了一种利用四辊液压轧机位置闭环的快速响应系统。采用PLC实现在轧机辊缝零位调整时,对偏心进行记忆,而当投入轧制时则可实现偏心补偿的方法。分析了补偿原理及实践方法,给出了程序流程图。该系统对设计新型轧机或改造旧轧机都具有现实意义。 相似文献
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轧辊磨床是工业生产中不可缺少的一种重要生产设备,它用于磨削轧制机中的各种具有中凸度或中凹度的圆柱体轧辊。轧辊的中凸度或中凹度是为了在轧制过程中消除轧制件对于轧辊的作用力所产生的变形和热膨胀变形,以保证在轧制过程中各轧辊间等间隙,使轧制件沿宽度方向等厚。轧辊磨床具有外圆磨床的特点,但这类磨床的结构和传动原理都比一般的外圆磨床复杂,它除了能磨削一般的圆柱体工件(平辊)外,还要求能够磨削带有中凸或中凹的轧辊。因此,机床的运动相对比较复杂,除要求砂轮与工件作回转运动外,还要求二者在作纵向相对运动的同时,… 相似文献
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辊系管理好坏直接影响钢铁企业生产效益,建立辊系管理信息化系统,不仅指导现场合理经济的使用辊子,使得钢铁企业从横向和纵向规范辊系管理,而且能去除繁琐复杂的人工记录,降低辊系故障率,减少误操作,提高产品质量。本系统通过Asp语言编写,结合Sqlserver2008强大的数据库系统,利用局域网连接IE浏览器进入系统操作,及时动态跟踪轧辊状态、库存情况和轧辊消耗,对辊系的检测、报废、更换、验收和故障查询管理,利用Flash曲线记录历史趋势,生成报表打印和导出Excel文件,最终实现辊子的全流程、全寿命管理。 相似文献
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邱芳 《自动化技术与应用》2014,(3):73-75
宽厚板厚度控制的目的是轧制出板形良好、板凸度小、同板差和异板差尽可能小的产品.莱钢宽厚板生产线自投人生产以来,在板凸度、厚度的均匀性、同板差和异板差等宽厚板厚度控制的瓶颈问题上都难以达到要求.为了实现对轧制厚度的要求,我们在现有的厚度控制模型的基础上,深入理解其控制功能、补偿功能的作用,找到引起厚度难以控制的主要因素,采取轧辊刚度补偿、轧辊偏心补偿、支撑辊油膜厚度补偿、工作辊热膨胀补偿及冲击力补偿等措施来优化厚度控制模型.自优化相应厚度参数和增加相关补偿控制功能以来,宽厚板厚度控制的精度得到很大的提高,具有很高的推广价值. 相似文献
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Roller hemming is a relatively new process used to achieve high-precision assembly of auto-body enclosure panels. During the process of roller hemming, accuracy of the roller pose and trajectory affects the hemming quality of the product. The traditional passive method based on robot teaching to determine the pose of the roller is inefficient and time-consuming. In these studies, we proposed an active method for solving roller pose and trajectory based on differential geometry for curved surface-curved edge geometric characteristics of auto-body enclosure panels and multi-pass reciprocating motions of the roller. Firstly, the local coordinate system of the die was constructed based on the Frenet Frame according to the normal vector of the surface of die and the tangent vector of the curved die edge. Secondly, the coordinate system of the die, diameter of the roller, TCP-RTP value, and inclination of the roller were combined to form the roller pose based on a homogeneous transformation matrix. Based on the obtained trajectory curve of the roller reference point, the equal chord deviation error method was used to analyze the roller trajectory. Finally, a roller pose and trajectory solving algorithm was developed based and implemented using PYTHON to obtain the positions and poses of the roller at several discrete reference points. ABAQUS software was subsequently utilized to complete modeling of the roller pose and trajectory. This research supports the multi-field mechanical simulation of robot roller hemming for curved surface-curved edge panels and provides support for determining roller pose and kinematic trajectory of industrial robot roller hemming for curved surface-curved edge panels. 相似文献
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金属复合板波纹辊轧制成形是一项变革技术,在复合板轧制成形的过程中,轧制界面的非线性阻尼以及上下波纹辊之间的非线性刚度都可能导致主共振的发生,造成辊缝的波动.考虑了波纹辊轧机波纹界面间的非线性阻尼和非线性刚度,建立了波纹辊轧机两自由度垂直非线性数学模型.利用奇异值理论和相平面法讨论了波纹辊轧机辊系自治下的稳定性,运用多尺度法求解了波纹辊轧机辊系在波纹界面激励下主共振的解析近似解和幅频特性方程.分析了非线性刚度系数、非线性阻尼系数、系统阻尼系数、轧制力的幅值等参数对主共振的影响.设计了线性和非线性复合作用的时滞反馈控制器来对波纹辊系的主共振进行控制,并且通过数值仿真验证了控制器设计的正确性和可行性. 相似文献
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Hilbert-Huang变换是一种新的自适应信号处理方法,非常适用于非线性和非平稳过程。该文在介绍Hilbert-Huang变换的基础上,针对滚动轴承故障振动信号的非平稳特征,提出了一种基于Hilbert-Huang变换的特征能量法。该方法在Hilbert-Huang变换的基础上定义滚动轴承振动信号在固有频率段的能量为特征能量,以此作为滚动轴承的故障特征向量,并通过建立M-距离判别函数来识别滚动轴承的故障类型。对滚动轴承外圈和内圈故障信号的分析结果表明,基于Hilbert-Huang变换的特征能量法可以有效地提取滚动轴承振动信号的故障特征。 相似文献
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Alexandros C. Dimopoulos Christos Pavlatos George Papakonstantinou 《Computer Languages, Systems and Structures》2010,36(2):203-222
Attribute grammars (AG) allow the addition of context-sensitive properties into context free grammars, augmenting their expressional capabilities by using syntactic and semantic notations, making them in this way a really useful tool for a considerable number of applications. AGs have extensively been utilized in applications such as artificial intelligence, structural pattern recognition, compiler construction and even text editing. Obviously, the performance of an attribute evaluation system resides in the efficiency of the syntactic and semantic subsystems. In this paper, a hardware architecture for an attribute evaluation system is presented, which is based on an efficient combinatorial implementation of Earley's parallel parsing algorithm for the syntax part of the attribute grammar. The semantic part is managed by a special purpose module that traverses the parse tree and evaluates the attributes based on a proposed stack-based approach. The entire system is described in Verilog HDL (hardware design language), in a template form that given the specification of an arbitrary attribute grammar, the HDL synthesizable source code of the system is produced on the fly by a proposed automated tool. The generated code has been simulated for validation, synthesized and tested on an Xilinx FPGA (field programmable gate arrays) board for various AGs. Our method increases the performance up to three orders of magnitude compared to previous approaches, depending on the implementation, the size of the grammar and the input string length. This makes it particularly appealing for applications where attribute evaluation is a crucial aspect, like in real-time and embedded systems. Specifically, a natural language interface is presented, based on a question-answering application from the area of airline flights. 相似文献
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针对传统纺纱机的分梳辊、罗拉等工作部件因无法实时调节速度造成成品纱线粗细不均、断线等问题,以步进电机作为纺纱机的主要工作部件,设计了基于FPGA的多通道电机控制系统,并在硬件平台上加以验证。在程序中设置多个寄存器存放当前所有电机的给定速度、实际速度等信息,以增量式光电码盘实时检测电机转速并传输给FPGA,运用S曲线算法控制电机速度自动调节至给定值,最终在液晶屏幕上显示调节后的电机速度和档位。实验结果表明,S形速度曲线更符合步进电机的加减速特征,能够缩短电机达到所需速度的工作时间,且其硬件平台易于搭接,控制精度高,操作简易。 相似文献
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提出了基于EMD(Empirical mode decomposition)和奇异值分解技术的滚动轴承故障诊断方法。采用EMD方法将滚动轴承振动信号分解成若干个基本模式分量(Intrinsic mode function,IMF)之和,并形成初始特征向量矩阵。然后对初始特征向量矩阵进行奇异值分解得到矩阵的奇异值,将其作为滚动轴承振动信号的状态特征向量,通过建立Mahalanobis距离判剐函数判断滚动轴承的工作状态和故障类型。实验数据的分析结果表明,本文方法能有效地应用于滚动轴承故障诊断。 相似文献