共查询到20条相似文献，搜索用时 21 毫秒
1.
This study aimed to establish a set of gray cloth defect inspection module using image processing technique, so as to develop
a full intelligent online dynamic gray cloth defect automatic inspection system. Gray cloth defects to be recognized in this
study included holes, stains, warp missing, spider web and weft missing. First use wavelet transform and co-occurrence matrix
to find features of gray cloth defect image, next, use back-propagation neural network (BPNN) to make gray cloth defect classification
and data output. BPNN was capable of solving nonlinear problems, thus assisted in enhancing defect recognition effect. As
every defect to be inspected in this study varied in size and shape, so advantage of BPNN could be used as aid more than else.
This study primarily utilized image processing technique to inspect gray cloth defects, not only in a faster speed than common
visual inspection, but also eliminating arbitrary factors of inspectors in body and psychology during inspection, resulting
in absolute objectivity. Finally, tension control module built in Part 1 and gray cloth defect inspection module built in
this study were integrated, and a full intelligent online dynamic gray cloth defect automatic inspection system established.
As validated by experiment result, the system established in this study could successfully recognize gray cloth defects, with
total recognition rate amounting to 92.5 %. 相似文献
2.
Mohsen Shanbeh Fatemeh Ataee Abbas Tabibi Sedigheh Khanmohammadi 《Fibers and Polymers》2014,15(2):373-381
Set marks are fabric defects in weft direction which are caused by an interruption of the weaving process. In this study, based on one-quarter fractional factorial design, among eight parameters of weaving machine, i.e. horizontal and vertical position of back rest roller, horizontal position of warp stop motion, shed crossing degree, shed crossing point position, warp tension, stoppage position of machine, and stoppage time, four most effective parameters was determined. These parameters were stoppage position of machine, vertical position of back rest roller, shed crossing point, and horizontal position of warp stop motion. Then using full factorial design effectiveness of these parameters was evaluated statistically at 99 % confidence level and effect of them on set mark studied in detail. Statistical evaluations showed that the stoppage position of machine was the most effective parameters on intensity of set mark of multifilament polyester fabric. A specific image capturing device for using on weaving machine based on CCD camera was designed. Image processing technique was used to measure the pickspacing in stop zone objectively. Five picks before and five picks after stoppage was considered as stop zone and the standard deviation of pickspacing was used as a criterion which interpret this defect. Dynamic loading of warp yarns were execute to evaluate the relaxation behavior of polyester multifilament warp yarns. 相似文献
3.
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
4.
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
5.
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
6.
当前，大部分有关RFID的文章，都在探讨RFID在提高产品物流速度和信息采集质量方面的作用或研究有关RFID硬件设备，而有关RFID阅读器的驱动及接口技术方面的研究很少。主要介绍了RFID阅读器的驱动模块及模块工作原理，同时介绍阅读器与上层数据管理器之间的接口设计。 相似文献
7.
本研究对不同采集地割手密无性系进行耐寒性综合评价,探究割手密耐寒性与其生长地海拔、纬度的关系,筛选耐寒性种质资源。以40份割手密无性系为试验材料,在苗期低温胁迫后测定各无性系材料的7项生理指标,利用相关性分析、聚类分析和模糊隶属函数分析法对其耐寒性差异进行综合评价。低温胁迫处理后,割手密的脯氨酸(Pro)、丙二醛(MDA)、电导率(PMP)、可溶性蛋含量(SP)均呈上升趋势,其中脯氨酸含量上升最大,升高了43.81%,而叶绿素(Chl)、超氧化物歧化酶(SOD)、过氧化物酶(POD)均呈下降趋势,其中叶绿素含量减少35.01%,下降程度最大;叶绿素、脯氨酸、超氧化物歧化酶的变异系数较对照有不同程度的增加,其中增长最大的是叶绿素,是对照的1.76倍;相关性分析显示,40份割手密无性系耐寒性与其生长地的海拔、纬度呈极显著正相关,相关系数分别为0.867、0.686;模糊隶属函数和聚类分析将40份割手密无性系的耐寒性分为三类,其中高耐寒类型有10份材料,中耐寒性有19份,不耐寒性11份。研究结果表明,不同采集地割手密材料之间耐寒性指标存在明显差异;耐寒隶属函数与海拔、纬度呈极显著正相关,即高海拔和高纬度的割手密耐寒性强、低海拔和低纬度的割手密耐寒性弱,表明在相近海拔范围内决定耐寒性的主要因素是纬度,在相近纬度范围内决定耐寒性的主要因素是海拔。该结果为割手密种质资源在甘蔗耐寒育种中的进一步利用提供依据。 相似文献
8.
9.
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
10.
以21份骨干玉米自交系为研究材料,播种后21 d进行5 d的高温处理,测定株高、茎粗、叶面积、地上鲜重、地上部干重、总干重、胚根长、地下部分干重、根冠比和SPAD值共10个性状的耐热系数,运用主成分分析、隶属函数法、聚类分析及灰色关联度相结合的方法,对玉米自交系的耐热性进行综合评价。结果表明,主成分分析将10个单项指标转换为3个相互独立的综合指标,代表了全部数据83.16%的信息量。通过隶属函数法技术综合耐热评价值(D),进行聚类分析,将21份自交系按耐热性强弱划分高耐热型、中耐热型、弱耐热型和热敏感型4类,筛选出2份高耐热型自交系KW4M029和DM08。总干重可以作为玉米自交系苗期简单、直观的耐热性鉴定指标。 相似文献
11.
This paper reports on the effect of pre-tensions on needle and bobbin threads, sewing speed, thickness of fabric plies and the linear density of the threads on the tension peaks occurring on needle thread during sewing on a single needle lock stitch machine. The needle thread tensions are measured at two locations: above the needle bar (bottom segment) and above the needle thread tensioner (top segment). A factorial design approach is used to study the four parameters. The role of bobbin tension is studied in a separate experiment, while keeping the pre-tension on the needle thread constant. The highest tension observed on the needle thread is the stitch tightening tension which is directly affected by the pre-tension set on the needle thread disc tensioner. Heavier threads develop lower tightening tension which may affect the seam balance. The thickness of fabric plies does not affect the needle thread tension. Sewing speed has marginal influence on the stitch tightening tension near the needle thread tensioner. The pre-tension on the bobbin thread affects only the needle thread tension when the take up lever pulls up the needle thread loop to release it from the rotary shuttle hook gib. 相似文献
12.
Lack of natural textile resources, the present textile industry in Taiwan usually uses pre-oriented yarn (POY), kind of artificial fibers, to make yarns. The POY is wound from continuous spinning of esterification and superposition of plastic pure terephthalic acid (PTA) and ethylene glycol (EG). According to yarn assessment indicators, yarn breakage of POY is crucial. And the broken filament and toughness are the most two important indicators causing yarn breakage during quality measurement. This study applies Taguchi Method to jointly consolidate broken filament degradation rate and toughness elongation percentage to establish a proper orthogonal array. The experimental control factors includes knotting device type, winding tension (CN), oil rate (%), and knotting pressure (kg/cm2), and a L 18(21×37) orthogonal array is established. The key parameter design of control factors can be found by Taguchi experiment. The fuzzy inference is combined with Taguchi multiple quality characteristics to construct the process parameter module to effectively increase product yield. 相似文献
13.
选用大茎野生种57NG208与南涧果蔗正反交所得的12个后代为试验材料,采用桶栽试验的方法,在甘蔗拔节初期设正常供水（CK）、轻度胁迫和重度胁迫3处理进行人工水分胁迫,分别测定3处理的形态指标及生理生化指标,利用隶属函数分析﹑灰色关联度分析和聚类分析,综合评价12份参试材料在不同水分胁迫下耐旱性的强弱。结果表明：不同水分胁迫处理对供试甘蔗主要测定指标均有显著影响;在不同水分胁迫下甘蔗叶片中的PMP、MDA含量、Pro含量、SOD和POD酶活性数值升高,CHL含量和Hight数值降低,变化幅度因水分胁迫程度及参试材料的差异而不同;隶属函数分析结果表明,在不同水分胁迫下,大茎野生种57NG208与南涧果蔗正交材料排在前5位的数量比其反交多;聚类分析表明,所有参试材料在轻度、重度水分胁迫下,均可分为4大类别,云瑞2012-9-11和云瑞2012-38-81的耐旱性较好,无论轻度、重度水分胁迫处理均聚为一类;灰色关联度分析表明,在不同程度的水分胁迫下,各项测定指标与耐旱性间的关联度不同,CHL、Pro和POD等3项生理生化指标与甘蔗耐旱性关联度较高,是甘蔗耐旱性评价的优良指标。 相似文献
14.
M. G. Scanlon R. Roller G. Mazza M. K. Pritchard 《American Journal of Potato Research》1994,71(11):717-733
Color analysis is a critical quality evaluation procedure in the potato processing industry. This research sought to determine whether potato chip color could be quantified by video image analysis. Russet Burbank and Shepody potatoes, stored at 8 and 5 C, were processed into 8 mm thick chips, which were fried for three time periods. Chip color was characterised by mean gray level values. Changes in video equipment operation and sample presentation were investigated to establish the most reproducible conditions for chip color measurements. The use of image analysis software to analyze mean gray level values from specific regions of the chip was demonstrated. Differences in chip color from potatoes stored at the two temperatures could be distinguished by mean gray level values. For potatoes that had been stored at 5 C, different chip frying times were distinguished on the basis of mean gray level. Chips of 1 mm thickness were prepared from 13 selections and 2 cultivars and color measured by mean gray level, Lvalue (Hunterlab D25L-2 colorimeter) and by Agtron value (Agtron M31A color meter, green mode). Good correlation was found between color assessed by mean gray level and color measured by the Agtron and Hunterlab. A repeatability study showed that image analysis color was not as repeatable as color measured by the two other techniques. Nevertheless, video image analysis appears to have potential as an objective assessor of chip color, and through software development, has specific advantages over other color assessment techniques. 相似文献
15.
This is the first time in the literature dealing with the dynamic modeling and control of a rotating padder roller system.
It is intended to design a control system with effective scheme and robustness to stabilize all vibration modes of a rotating
padder roller system by using one set of sensor and actuator. The controller design depends on the specific pole-zero patterns.
In practice, the pole-zero patterns remain the same, no matter how the physical system parameters are different. By properly
placing the actuator and sensor, a realizable controller and sensor is designed to stabilize all the vibration modes and make
the closed loop system absolutely stable. This will suppress the vibration without suffering from spillover and can eliminate
an infinite number of vibration modes. The performance of this controller has been successfully implemented by computer simulation. 相似文献
16.
人工模拟水分胁迫条件下小麦幼苗抗旱性鉴评指标的分析 总被引：2，自引：0，他引：2
为了明确小麦幼苗抗旱性鉴定评价的最佳时期和有效指标,以小麦加倍单倍体(Doubled haploid,DH)群体的150个株系为材料,采用模拟干旱胁迫法,研究了水分胁迫及复水条件下,幼苗叶片相对含水量、叶片相对电导率、根冠比、根干重和最大根长等五个抗旱相关性状的动态变化和遗传力,分析了各性状及其与平均隶属函数值之间的关系.结果表明,在水分胁迫72 h(WS72)和复水24 h(RW24)时,基因型之间的性状变异范围较大,是进行幼苗抗旱性鉴定评价的较好时期;平均隶属函数值不仅受各性状的直接影响,还受到性状之间交互作用的影响.在选择适当的与抗旱性关系密切性状的基础上,估算平均隶属函数,作为评价抗旱性的综合指标,可能是进行作物抗旱性综合评价的有效途径. 相似文献
17.
This paper, the first of a two-part series, aims to find the effect of stitch length, check spring tension, fabric feed timing and needle thread in-take length on tension peaks occurring on a spun polyester needle thread during a sewing cycle of a SNLS sewing machine. The pre-tensions on the bobbin and needle threads and sewing speed were kept constant. A PC interfaced measuring instrument was fabricated to measure dynamic sewing tension on needle thread above the needle bar. Four prominent tension peaks were detected. Longer stitch length causes higher tension peaks; and shorter length stitch requires higher pre-tension to obtain a balanced stitch. The check spring tension has no effect on tightening tension. Incorrect timing of feed dog can cause very high tightening tension. The change in the position of thread length guide alters the friction of needle thread at critical guides which determines the length of thread to be released through tensioner; release of longer length of thread results in lower tension peaks (1, 2 and 4) and vice versa. 相似文献
18.
干旱是限制我国甘蔗产量提高的主要原因。采用桶栽和人工控水的方法,对云南省甘蔗主产区临沧市选取的20个甘蔗品种（系）进行抗旱性分析,通过测定苗期和分蘖期的8个抗逆生理指标,以及分蘖率、成活率和株高3个生长指标,采用模糊隶属函数、主成分分析和系统聚类分析方法对各甘蔗品种（系）的抗旱性进行综合评价。结果表明,干旱胁迫后,甘蔗叶片相对含水量、叶绿素含量、甘蔗分蘖率、株高和成活率呈下降趋势,而甘蔗叶片丙二醛、脯氨酸和可溶性糖含量、质膜透性、SOD和POD酶活性则呈上升趋势。通过模糊隶属函数、主成分分析和系统聚类分析可将20份甘蔗品种（系）材料分为3类,其中7个为抗旱品种（系）,6个为中等抗旱品种（系）,7个为不抗旱品种（系）;根据抗旱综合值,7个抗旱品种（系）的抗旱能力排名为：‘桂糖06-2081’>‘柳城05-136’>‘福农38’>‘柳城03-1137’>‘德蔗03-83’>‘云蔗05-49’>‘福农40’。相关分析表明,与甘蔗抗旱性呈显著正相关的指标分别为成活率、株高和叶片相对含水量,呈显著负相关的指标分别为质膜透性、脯氨酸和可溶性糖含量。 相似文献
19.
Young Seok Koo 《Fibers and Polymers》2002,3(2):80-84
Tension control is an important factor in producing high quality knitted products and in maintaining good processing condition.
Yarn tension during knitting is subject to be affected from many elements of the machine and process parameters. Several factors
including yarn feeding speed, feeding angle, and needle gauge that are considered to influence on the tension variation were
investigated. Yarn feeding speed did not show high contribution to the tension variation but feeding angle of yarn did show
high correlation with the tension. No or negative correlation of the tension with needle gauge was found from the results.
In order to keep well-determined process condition in the knitting manufacturing, it is strongly suggested that all knitting
elements and parameters should be in the integrated control circumstance. 相似文献
20.
芦笋种质资源营养品质分析及评价 总被引：2，自引：0，他引：2
为评价不同芦笋种质营养品质,筛选出营养物质含量丰富的种质资源,对46份国内外不同芦笋种质资源的Fe、Mn、Cu、Zn、Se、维生素C、可溶性糖、可溶性蛋白质、游离氨基酸和芦丁10个营养指标的含量进行测定,并利用模糊数学的隶属函数法,通过计算不同芦笋种质单一营养指标的隶属函数值,对其进行营养品质综合评价。结果表明,不同芦笋种质嫩茎的营养品质存在明显差异,各营养品质指标变异程度不同。46份芦笋种质中,综合营养品质居上的是Pacific Purple、Backlim、JK106、Gijnlim。Pacific Purple营养品质最佳,平均隶属函数值为0.445。 相似文献