基于模糊多模型的恒张力控制技术的研究

通过分析焊丝层绕机的结构、特点以及在收线过程中影响焊丝张力的因素,建立张力系统数学模型,提出了基于线速度自适应的浮动辊位置反馈的控制策略;针对放线卷径变化对系统的影响,提出了模糊多模型的控制方案,设计了基于卷径模糊切换规则的多模型控制器。通过仿真实验证明能较好地满足预期控制要求。     

多线切割的张力波动影响因素分析与对策

根据太阳能硅片多线切割加工机理,建立了张力控制系统的速度差模型和运动学模型。采用速度同步模型和自适应控制方案,结合张力控制电机反馈的角速度和角位移大小对收/放线电机的速度输入进行修正,达到对张力的有效控制。针对会引起张力扰动或张力波动过大的相关因素进行分析研究,其中包括收线辊半径扰动、切割线走丝换向以及导向轮对张力波动的影响。针对这些张力波动影响因素,提出相关解决方案,MATLAB/simulink仿真结果表明所提出的解决方案具有可行性。     

线团复绕设备自适应随动控制方法研究

利用线团复绕设备绕制的线团产品,要提高线团绕制质量并保证其质量一致性,需要在复绕过程中保证收、放线线速度匹配和导线张力的稳定。为此,该设备采用了由浮动轮位置调节技术与放线随动专家PID算法综合控制而形成的自适应随动控制方法。通过对该控制方法的分析和试验表明,该方法能有效提高线团复绕设备的绕制性能。     

线缆卷绕机的PLC控制系统设计

设计了线缆卷绕机的控制系统.该系统以可编程控制器(PLC)为核心,还包括触摸屏、变频器、伺服驱动器/伺服电动机等部件.卷绕时,PLC根据设定值通过放线变频器控制放线速度,通过张力调节控制绕线变频器实现绕线与放线同步,排线由伺服电动机根据绕线速度协调完成.设备使用表明:系统运行平稳,卷绕紧密、美观,避免了叠线,塌边等现象...     

手术缝合线涂层工艺中张力自稳定系统的设计

为保持手术缝合线涂层工艺过程中丝线张力的稳定性,通过分析传统张力的控制方式及其局限性,提出了一种基于速度跟随原理的张力自稳定系统。该系统采用主动放线方式,从动力学角度建立放线系统张力控制模型,设计弹簧-张力杆机构。通过实时检测走线过程中张力的波动,改变主动放线速度,从而减小走线过程中丝线张力的波动幅度,提高系统稳定性。构建了虚拟样机,在ADAMS中进行动力学仿真,仿真结果表明该弹簧-张力杆机构能将张力的波动幅度减小70%。最终以与强生（中国）医疗器材有限公司共同研制的四头上蜡机作为测试对象,与传统设备相比,该方案可将张力的波动幅度减小53%。     

张力调节器(PID控制器)的应用与调试

介绍已证实的，非常可靠和先进的张力调节器在生产中应用与调试技术，AT19A to AT23系列是直流驱动器实现无级调速的速度给定电路板，主要用于电缆行业收／放线架转速控制，通过一短行程摆动杆所处的位置来实现。AT19A可用作为多用途的PID控制器应用于各种问题的解决，本文选择它作为张力调节器，使收线架收线时，电缆始终保持恒定的张力。     

基于SIMOTION D425的毛箔机直接张力控制系统

为提高毛箔机张力控制的精度以及稳定性，以铜箔张力和线速度为控制目标，提出基于SIMOTION D425的直接张力控制系统。以阴极辊控制电机作为速度基准电机，保持铜箔线速度恒定，以收卷控制电机作为张力产生的主动控制单元，张力传感器作为张力反馈元件，构成直接张力闭环，保持铜箔张力恒定。分析了张力闭环的原理，并以恒张力为控制目标，建立了闭环控制模型。在此基础上，推导了张力积分分离的PID算法，以此来消除静差，实现更精确的张力控制。结果表明：所提系统不但实现了传感器数据采样、卷径计算和锥度调节，控制伺服驱动的输出，而且实现了铜箔收卷张力闭环控制，转速波动为0.34%，张力波动为1.75%，为毛箔机的张力控制提供了可靠的解决方案。     

数控机床直流直线电机结构设计及控制系统研究

为解决现有直线电机存在边端效应、推力波动大以及控制系统复杂等问题,设计出一种新的直流直线电机结构,并对该电机的数学模型和动态特性进行了较为深入的分析.针对单闭环系统受绕组电压、负载和动子质量的影响,易出现电流和速度波动等问题,设计了多环结构的控制系统,并引入前馈控制方法改善了系统动态跟踪特性.基于上述分析,利用MATLAB对系统进行了仿真研究,结果显示所设计的电机结构具有较好的可行性和可控性,且引入前馈控制的多环控制系统可有效抑制电流和速度的波动,使系统的动态跟踪特性得到显著提高.     

多线切割机排线机构参数优化设计

多线切割机排线机构是走线系统正常运行的主要机构。传统的排线机构存在各导轮之间钢丝张力波动较大、易造成钢丝拉断的缺陷。文中介绍了一种新的设计方法:通过建立导轮张力包角模型,得出导轮两边张力与包角大小和摩擦系数之间的关系;由排线机构中导轮与滑轮之间相对的几何位置,推导出钢丝张力和包角与设计参数L1、H之间的关系表达式。利用优化方法确定导轮与滑轮之间最佳的几何位置,使排线机构工作时钢丝张力波动最小,在多线切割机往复走线过程中,有利于放线辊上的钢丝会逐渐过渡到收线辊上,保证了收放线系统平稳、有序地运行。     

不锈钢精线放线收线控制系统设计

本文设计出的基于PID算法不锈钢精线放线收线控制系统,放线台控制器利用张力传感器检测不锈钢精线的张力,根据检测到的张力值大小,利用PID算法,调节放线电机的转速,当不锈钢精线经过高温退火炉时的张力小于预设值,不锈钢精线直径不发生改变,从而提升不锈钢精线品质。     

高精度张力控制器设计及补偿算法研究

针对绕线机对张力和速度较高的控制要求,提出了一种高精度张力解耦控制算法。在详细分析系统数学模型的基础上,将系统解耦为开卷辊恒张力控制和复卷辊恒速度控制。该算法将参考速度预测算法、前馈扰动补偿算法、张力反馈控制算法有机结合起来,实现了对张力和速度的高性能控制。通过构建以绕线机为对象的实验平台,对传统的张力反馈控制算法和所提出的控制算法分别进行实验。实验结果表明:该控制策略能有效地抑制卷径变化对张力和速度的影响,实现张力和速度的稳定控制。
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Design and Analysis of a Novel Tension Control Method for Winding Machine

Filament winding has emerged as the main process for carbon fiber reinforced plastic(CFRP) fabrication, and tension control plays a key role in enhancing the quality of the winding products. With the continuous improvement of prod?uct quality and e ciency, the precision of the tension control system is constantly improving. In this paper, a novel tension control method is proposed, which can regulate the fiber tension and transport speed of the winding process by governing the outputs of three di erent driven rollers(the torque of the unwind roll, the torque of the magnetic powder brake roller, and the speed of the master speed roller) in three levels. The mechanical structures and dynamic models of the driven rollers and idle rollers are established by considering the time?varying features of the roller radius and inertia. Moreover, the influence of parameters and speed variation on fiber tension is investigated using the increment model. Subsequently, the control method is proposed by applying fiber tension in three levels accord?ing to the features of the three driven rollers. An adaptive fuzzy controller is designed for tuning the PID parameters online to control the speed of the master speed roller. Simulation is conducted for verifying the performance and sta?bility of the proposed tension control method by comparing with those of the conventional PID control method. The result reveals that the proposed method outperforms the conventional method. Finally, an experimental platform is constructed, and the proposed system is applied to a winding machine. The performance and stability of the tension control system are demonstrated via a series of experiments using carbon fiber under di erent reference speeds and tensions. This paper proposes a novel tension control method to regulate the fiber tension and transport speed.     

基于级联滑模控制的高精度光电跟踪与捕获

为了进一步提高光电跟踪系统的目标捕获和跟踪性能,提出了一种基于变增益趋近律的级联滑模控制方法。基于反双曲正弦函数和幂次项设计了新型变增益滑模趋近律,在提高滑模面趋近速度的同时抑制滑模抖振现象;基于变增益滑模趋近律设计速度环和位置环滑模控制器构成级联滑模控制,以提高系统的动态响应性能和鲁棒性,提高系统对目标的捕获能力和跟踪精度。最后,以某球形光电跟踪系统的方位轴作为控制对象,进行了传统级联PI控制和级联滑模控制方法的对比分析。实验结果表明,相比于传统级联PI控制,捕获速度为1(°)/s的目标时,级联滑模控制可以将目标捕获时间减小32%;跟踪等效最大速度为4(°)/s和最大加速度为2(°)/s 2的正弦引导信号,可将跟踪误差RMS值减小31%,采用级联滑模控制可有效提高跟踪系统的控制性能。     

Analysis and compensation for the cascade dead-zones in the proportional control valve

The four-way proportional directional control valve has been widely used as the main stage spring constant for the two-stage proportional control valve (PDV). Since a tradeoff should be made between manufacturing costs and static performance, two symmetry dead-zones are introduced in the main stage spring constant: the center dead-zone caused by the center floating position and the intermediate dead-zone caused by the intermediate position. Though the intermediate dead-zone is much smaller than the center dead-zone, it has significant effect on the dynamic position tracking performance. In this paper, the cascade dead-zones problem in a typical two-stage PDV is analyzed and a cascade dead-zones model is proposed for the main stage spring constant. Then, a cascade dead-zones inverse method is improved with gain estimation and dead-zone detection to compensate the dead-zone nonlinearity. Finally, a digital controller is designed for verification. The comparative experimental results indicate that it is effective to reduce the large position tracking error when the proposed method is applied.     

薄膜张力控制系统的建模与设计

鉴于薄膜收换卷时的张力大小及平稳性对收卷质量具有决定性的影响,针对流涎机收卷系统的动态过程,分析了张力与收卷线速度、卷径及转速之间的动力学关系,提出了张力控制原理,并分析了薄膜在收换卷时收卷电机转速的变化补偿规律。在此基础上,设计了薄膜在收换卷时的张力控制系统,通过控制速度差对张力进行间接控制,同时采用BP神经网络PID控制器调节收卷转速对张力进行直接补偿。仿真对比结果表明,该控制器动态响应好,抗干扰能力强。实际应用实例也证明该控制方法张力控制精度高,控制高效可靠, 对改善系统的动态特性和提高薄膜的收卷质量有着重要意义。     

A study on the dynamic performance of the 200km/h Korean tilting train by means of roller rig test

The dynamic performances of newly developed railway vehicles should be carefully verified step by step, from computer simulation through the laboratory-based roller rig test to the main line trial running test. The laboratory-based roller rig test is an effective and safe way to evaluate the dynamic characteristics such as high speed, ride comfort and dynamic behaviors. This experimental research was performed to evaluate the dynamic performances of the 200 km/h Korean tilting train, ‘Hanvit200’, by means of a full scale roller rig test. The newly developed tilting mechanism and stabilizer were included in the tilting bogie to satisfy both the conflicting requirements of higher stability and higher curving performance. This paper shows the roller rig test results and the effectiveness of tilting bogie design. Included are the roller rig test results of various kinds of conditions such as tare and fully laden load case, normal and failed case of important bogie components, linear and non-linear critical speed. This paper was presented at the 4th Asian Conference on Multibody Dynamics(ACMD2008), Jeju, Korea, August 20–23, 2008. Nam-Po Kim received a B.S. degree in Mechanical Engineering from Ajou University in 1985. He then went on to receive his M.S. and Ph.D. degrees from Ajou University in 1992 and 2008, respectively. Dr. Kim is currently a principal researcher at the department of vehicle dynamics and propulsion system at Korea Rail Road Research Institute in Uiwang, Korea. His research interests are in the area of railway vehicle dynamics, active control of running gear for railway vehicle and vehicle system engineering.     

一种用于汽车白车身焊接的高精度辊床设计研究

当今汽车制造业向着高精、多品种、多元化的方向发展,在汽车白车身的焊接过程中,为了实现焊接工艺的完整性,提高焊接的精度和效率,需要多组高速高精度辊床来与焊接机器人高效配合。介绍了一种高速高精度的辊床结构以及其控制系统,使用三菱 PLC 作为其主控制器实现辊床的控制工艺。该辊床装备具有高精度,速度快,稳定性强,可靠性高,运行方便等优点。对我国汽车制造业向着高水平的方向发展具有重要的指导意义。     

一种分析冷轧机卷取张力波动的新方法

依据卷径计算方法及张力控制原理,通过对iba-PDA系统在线监测并记录的卷取机线速度信号进行分析和处理,得到卷取机编码器运行状态,分析和研究由于速度检测错误而导致卷取张力波动的机理以及解决此问题的方法。     

超长筒段内壁螺旋焊缝跟踪打磨控制研究

针对超长筒段内壁螺旋焊缝的打磨需求,设计了一种高精度内壁螺旋线焊缝打磨控制方法,通过速度反馈匹配、视觉图像补偿等多重手段,建立了实时跟踪检测机制,解决了螺旋线焊缝跟踪不同步的问题,实现了焊缝的精确打磨加工。通过实验验证了此控制方法的可行性,采用西门子的控制系统、伺服驱动器、编码器和视觉图像系统,结合机械结构系统,包括滚轮架、柔顺打磨工具、电机及行走轨道等,搭建全闭环软硬件控制系统平台,经过调试验证,通过图像系统实时监控和实际打磨效果的结合,验证了此方法应用于内壁螺旋线打磨的有效性,实现了精确跟踪打磨。     

A fault diagnosis approach for roller bearing based on VPMCD under variable speed condition

Essentially the fault diagnosis of roller bearing is a process of pattern recognition. However, existing pattern recognition method failed to capitalize on the nature of multivariate associations between the extracted fault features. Targeting such limitation, a new pattern recognition method – variable predictive model based class discriminate (VPMCD) is introduced into roller bearing fault identification. The VPMCD consider that all or part of the feature values will exhibit interactions in nature and these associations will have different performances between different classes, which is always true in practice when faults occur in roller bearings. Target to the characteristics of non-stationary and amplitude-modulated and frequency-modulated (AM–FM) of vibration signal picked up under variable speed condition, a fault diagnosis method based upon the VPMCD, order tracking technique and local mean decomposition (LMD) is put forward and applied to the roller bearing fault identification. Firstly, LMD and order tracking analysis method are combined to extract the fault features of roller bearing vibration signals under variable speed condition; Secondly, the feature values are regard as the input of VPMCD classifier; finally, the working condition and fault patterns of the roller bearings are identified automatically by the output of VPMCD classifier. The analysis results from experimental signals with normal and defective roller bearings indicate that the proposed fault diagnosis approach can distinguish the roller bearing status-with or without fault and fault patterns under variable speed condition accurately and effectively.