共查询到20条相似文献，搜索用时 31 毫秒
1.
Key factor determining production quality is the deformation control between running rollers of pressure dyeing machine during
the operation. Currently the industrial communities try to alleviate the defects by taking experiments. This study aims to
approve theoretical practicality of providing controller and its parameters suitable to abolish vibration displacement in
operating pressure dyeing machine in order to improve pressure dyeing quality and lengthen machine’s life. Firstly, the dynamic
equation of the pressure dyeing machine’s running roller is derived and its corresponding open-loop transfer function is obtained
from modal summation method. Then, the root locus method is used to design a controller which is realizable in the industrial
communities. Simulation indicates that the designed controller not only can eliminate vibration response generated during
pressure dyeing process and reducing greatly the previous process defects by making the two running rollers smoothly contact
with each other. The solution is a high efficient way to ameliorate pressure dyeing process with low cost and easy access. 相似文献
2.
This series of paper discussed the dynamic modeling of non-woven fabric roller carding and the control of web density uniformity.
The dynamic system of dry non-woven fabric roller carding was set up to analyze the dynamic model; then in the process of
derivation, theoretical exploration and studies were carried out on one carding unit in the system, consisting of cylinder,
worker roller, stripper roller. After that, we probed into the relation between rotation angle and angular velocity of carding
unit, and analyzed the time-delay of carding unit. With Pade approximation, the time-delay was taken as the simplification
of the system model. The above conditions were utilized to derive the transfer function of carding unit and it was extended
to the dry non-woven fabric roller carding system combining four of carding units, feed roller, take-in and doffer in series
to obtain the transfer function of this whole system. After confirmed by the designed controller, the system was obviously
improved in its tracking property. The steady-state error was also eliminated. Meanwhile, with the participation of the controller,
this system might produce the maximum overshoot during its transient response. Therefore, this research regulated the reference
input according to the designed dominant poles. This combination scheme effectively control the occurrence of the maximum
overshoot and make for good system objectives. 相似文献
3.
Tension is very closely related with fabric inspection quality, as not well controlled tension of gray cloth will lead to
stretch, relax or fold of gray cloth, so that no sharpest image can be taken. Now that gray cloth tension and convey speed
are related with taking sharp image, so this study attempts to design a gray cloth tension control module, develop the intelligent
online dynamic gray cloth defect automatic detection system. Gray cloth tension control module makes direct regulation of
structural tension of feed and wind rolls and conveys speed control module by load cell coupled with A/D, D/A signal conversion
and two sets of inverters. This study utilized fuzzy control theory to design controller so as to keep surface tension consistency
of gray cloth, improve recognition rate of gray cloth defect, so that the system can have high action efficiency. In previous
fuzzy controller designs, membership functions were often designed by means of trial-and-error method, which usually cost
much time. This study used Taguchi method to make membership function programming, and made main effect analysis to choose
a group of optimal membership function combination. Through systematized, efficient experimental design, tension controller
designed in this study could stabilize gray cloth tension very soon, and acquire sharp gray cloth image. 相似文献
4.
基于支持向量机（SVM）的稻纵卷叶螟危害水稻高光谱遥感识别 总被引：5，自引：0，他引：5
对健康水稻叶片以及受稻纵卷叶螟危害后的水稻叶片进行了室内光谱的测定及分析。对430~530 nm和560~730 nm波段采用连续统去除的方法,分别提取了波深、斜率参量作为径向基核函数支持向量机的输入变量,利用LIBSVM软件包构建叶片高光谱识别模型。当参数γ和惩罚系数C分别取0.25和1时构建的径向基支持向量机模型的分类性能最佳,识别精度达100%。研究结果为实时水稻病虫害的早期监测以及田间管理提供了一定的理论基础。 相似文献
5.
This series of paper addressed the quality control of a vertical-type cross-lapper machine, which is used to produce uniform
layers of fibers with suitable widths and thicknesses. The nonlinear model of the system was derived, and the corresponding
state space representation was obtained. The linearized model based on the equilibrium position of the nonlinear model was
generated, and the associated control property was analyzed. The high order linearized model would be reduced to a verified
lower order model for control system design. The designed traditional and modern controller could make the crosslapper machine
for good card web quality control. 相似文献
6.
Han Jo Bae Youn-Sung Kim Soon-Yong Chun Un-Ho Ji Mu Han Kim Sung Soo Han 《Fibers and Polymers》2008,9(3):323-327
High regularity is important in manufacturing spun yarn. Among controllers used in regularity control, existing PID controller
is suitable for linear time-invariant systems but not for the control of sliver draft systems with non-linear characteristic.
Thus, the present study designed a knowledge-based fuzzy controller in consideration of disturbance and non-linear characteristic
of sliver draft systems. RLS (Recursive Least Squares) was used as an estimation algorithm to formulate a model used in computer
simulation for implementing the controller, and real time estimation was made using real data from draft systems to get a
model close to actual systems. This research used a estimation model in designing a knowledge-based controller that minimizes
the variation of control response to the sliver linear density of the system, and the result of linear density control was
used to prove the superiority of the controller in control performance through CV%. 相似文献
7.
Wheat bran is good for human health due to the abundance of dietary fiber. However, it also contains much phytate which has been well documented as an anti-nutritional factor. This study is the first to explore the effectiveness of reducing phytate content in wheat bran by directly removing the aleurone cell content utilizing different roller mills (smooth roller, coarse smooth roller and teeth roller) and different clean-up methods (brushing and ultrasonic washing). Through analysis of phytate content in wheat bran obtained from different mill systems, the best raw material was found to be obtained from the 5B system. By investigating various roller types and clean-up methods, the optimal technique was found to use a teeth roller mill combined with ultrasonic washing, which could reduce the phytate content by the greatest amount: the reduction of phytate content achieved 62.98% (from 26.80 mg/g to 9.92 mg/g) in wheat bran. The optical microscope observation indicated that ultrasonic washing could wash the aleurone cell content out from broken aleurone cells which were destroyed by the teeth roller mill. 相似文献
8.
热带作物田间生长环境信息包括风速、风向、光照强度、空气湿度、土壤湿度、CO2浓度、降雨量等数据，这些环境信息对作物的生长环境调控和作物田间科学管理非常重要。本研究围绕热带瓜果哈密瓜田间环境信息采集这一问题，研究哈密瓜田间生产环境智能传感与检测关键技术。采用tiny210硬件核心板，利用安卓系统和Java语言进行编程，集成空气温湿度传感器、光照一体传感器、土壤湿度传感器、风向传感器、风速传感器，建立热带瓜果哈密瓜田间生产环境智能传感与检测系统，主要解决哈密瓜田间生长环境信息动态采集和数据管理，为田间生长环境调控提供参考数据。 相似文献
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10.
In a cross-lapper system, the carriage unit is used to make uniform web in appropriate width and thickness. Traditionally, this is a stable, sluggish system with large attenuation of the input in the steady state. In this paper, the modeling, stability, order reduction, dynamic analysis and controller design of a cross-lapper system for good nonwoven web quality will be presented to deal with this issue. A realizable controller is designed which can not only make the closed-loop system efficient for good tracking property but also can achieve the meaningful design objectives. The performance can be effectively shown from the computer simulation. 相似文献
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A study has been carried out on selected hard and soft Australian wheats to determine the effect of conditioning on the crush-response profiles (CRPs) measured using the single-kernel characterization system (SKCS 4100). In addition, the fragmentation patterns that resulted from crushing in the SKCS have been compared with those that resulted from the first break stage of roller milling. It was found that the CRPs were changed significantly (P<0.05) as a result of conditioning. In particular, the rheological parameters shell stiffness and strength and endosperm strength all decreased following conditioning. The fragmentation patterns, assessed using low-resolution microscopy and particle size analysis, that resulted from the crushing of unconditioned wheat in the SKCS were the closest match with those that resulted from first break milling of conditioned wheat. These results show how the SKCS may be used to monitor the progress of wheat conditioning prior to milling. They also provide support for the use of SKCS measurements on unconditioned wheat for the prediction of milling performance. 相似文献
14.
基于嗅觉可视化技术的工夫红茶发酵程度判定方法 总被引：1，自引：0，他引：1
发酵是工夫红茶加工的关键工序,对红茶品质形成起着极其重要的作用。本文提出一种基于嗅觉可视化技术的工夫红茶发酵程度判定方法。基于硅胶薄层层析板与16种卟啉衍生物设计构建了嗅觉可视化传感器及气体检测系统,用于工夫红茶发酵过程中挥发性气体数据采集。采用Fisher判别分析与BP-AdaBoost算法建立工夫红茶发酵程度判别模型。分析表明,Fisher判别函数可以实现不同发酵程度红茶100%分类,交叉验证分组正确率达90.74%;BP-AdaBoost算法建立判别模型,训练集相关系数(Rc)和预测集相关系数(Rp)分别为0.9578和0.9132;嗅觉可视化技术可以实现工夫红茶发酵程度判定,为工夫红茶发酵过程实时监控提供了理论依据。 相似文献
15.
Brown TD Slotosch A Thibaudeau L Taubenberger A Loessner D Vaquette C Dalton PD Hutmacher DW 《Biointerphases》2012,7(1-4):13
Flexible tubular structures fabricated from solution electrospun fibers are finding increasing use in tissue engineering applications. However it is difficult to control the deposition of fibers due to the chaotic nature of the solution electrospinning jet. By using non-conductive polymer melts instead of polymer solutions the path and collection of the fiber becomes predictable. In this work we demonstrate the melt electrospinning of polycaprolactone in a direct writing mode onto a rotating cylinder. This allows the design and fabrication of tubes using 20 μm diameter fibers with controllable micropatterns and mechanical properties. A key design parameter is the fiber winding angle, where it allows control over scaffold pore morphology (e.g. size, shape, number and porosity). Furthermore, the establishment of a finite element model as a predictive design tool is validated against mechanical testing results of melt electrospun tubes to show that a lesser winding angle provides improved mechanical response to uniaxial tension and compression. In addition, we show that melt electrospun tubes support the growth of three different cell types in vitro and are therefore promising scaffolds for tissue engineering applications. 相似文献
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WeedPAM has been introduced as a new chlorophyll fluorescence imaging sensor to detect herbicide stress in weeds a few days after treatment (DAT). In this study, it was investigated if the sensor could differentiate between 50 sensitive and herbicide resistant populations of Alopecurus myosuroides 5 DAT. Resistance profile of all populations had been analyzed in standard greenhouse bioassays. Populations were sown in winter wheat at several locations in Germany over two years. At 3–7 leaves growth stage, they were treated with four ALS- and three ACCase-inhibitors at recommended dosages. Five DAT, maximum quantum efficiency of PS II was measured with the WeedPAM sensor on 40 A. myosuroides plants per treatment. Based on the sensor data, populations were classified into sensitive and resistant populations. Classification was verified by a visual assessment of all treatments and populations 21 DAT. In total, 95% of the WeedPAM classifications 5 DAT were correct. We could demonstrate that WeedPAM is capable to detect herbicide resistant A. myosuroides populations shortly after treatment. This allows selecting alternative weed control methods against resistant weed populations in the same growing season. 相似文献
18.
水稻害虫管理专家系统的设计与实现 总被引：4，自引：0，他引：4
水稻害虫管理专家系统(ESRICE)系用知识工程语言NEW ,编译BASIC 和dBASEⅢ 等构筑。系统共由13个子系统组成。各子系统可对不同代次的褐飞虱、稻纵卷叶螟的种群动态进行监测,并提供决策方案。系统耦联了外部教学模型以帮助用户回答咨询过程中系统提出的问题,或进一步确认是否需要化防及其用药时间。应用表明,该系统在水稻害虫管理上已达到专家水平。 相似文献
19.
不同耕作模式对土壤水分及烟叶产质量的影响 总被引：6，自引：1，他引：5
以烤烟品种JY-02．为材料,2008年在吉林延边烟区进行田间试验,研究了6种不同耕作方式对烟田土壤水分和烟叶产质量的影响。结果表明：（1）不同耕作方式之间差异明显,与对照（传统耕作）相比,深耕＋地膜覆盖、垄下深松＋地膜覆盖两处理的蓄水能力分别提高8．50％和6．96％;随着烟叶的生长,耕作方式对烟田土壤水分的影响有不同程度的减弱,但深耕、地膜覆盖对土壤水分的保蓄能力是十分显见的。（2）不同耕作模式可以稳定烟叶钾、氯含量,协调烟叶化学成分,使烟叶的产值、均价、上等烟比例均有不同程度的提高,促进了类胡萝卜素降解产物类香气物质、棕色化产物类香气物质、苯丙氨酸类香气物质和新植二烯的形成,明显提高了香气物质的总量。（3）综合分析表明,以深耕＋地膜覆盖对保墒蓄水和烤后烟叶产质量的效应最好,值得在我国大部分烟区推广使用。耕作方式对烤烟产质量的长期影响仍有待进一步研究。 相似文献
20.
Soon Yong Chun Han Jo Bae Seon Mi Kim Moon W. Suh P. Grady Won Seok Lyoo Won Sik Yoon Sung Soo Han 《Fibers and Polymers》2006,7(1):62-65
Making a good model is one of the most important aspects in the field of a control system. If one makes a good model, one is now ready to make a good controller for the system. The focus of this thesis lies on system modeling, the draft system in specific. In modeling for a draft system, one of the most common methods is the “least-square method”; however, this method can only be applied to linear systems. For this reason, the draft system, which is non-linear and a time-varying system, needs a new method. This thesis proposes a new method (the MLS method) and demonstrates a possible way of modeling even though a system has input noise and system noise. This thesis proved the adaptability and convergence of the MLS method. 相似文献