On-line Estimation of Biomass in Fermentation Process Using Support Vector Machine

Biomass is a key factor in fermentation process, directly influencing the performance of the fermentation system as well as the quality and yield of the targeted product. Therefore, the on-line estimation of biomass is indispensable. The soft-sensor based on support vector machine （SVM） for an on-line biomass estimation was analyzed in detail, and the improved SVM called the weighted least squares support vector machine was presented to follow the dynamic feature of fermentation process. The model based on the modified SVM was developed and demonstrated using simulation experiments.

On-line Estimation of Biomass in Fermentation Process Using Support Vector Machine

Biomass is a key factor in fermentation process, directly influencing the performance of the fermenta- tion system as well as the quality and yield of the targeted product. Therefore, the on-line estimation of biomass is indispensable. The soft-sensor based on support vector machine (SVM) for an on-line biomass estimation was ana- lyzed in detail, and the improved SVM called the weighted least squares support vector machine was presented to follow the dynamic feature of fermentation process. The model based on the modified SVM was developed and demonstrated using simulation experiments.

Compilation and Analysis Method for Computer Aided Pattern Design System Based on Fully-Fashioned Computerized Flat Knitting Machine

The knitting industry CAD/CAM system＇s development needs a solution of computer representation of the designed objects. One of them is a transformation of knitting rows and stitches form knitting pattern and its automatic analysis is to control data from the knitting design data. A method of the pattern CAD system including the analyzing and the compiling of the pattern data was developed in this paper. By rasterizing the pattern map, the drafted pattern could be compiled into knitting row data and stitches. The storage format of knitting rows data and stitches data could be defined by analyzing the motion of computerized fiat knitting machine. By reassembling the control data, it could be analyzed into the execute data of the controller in computerized fiat knitting machine. This method mainly focused on the weak areas of multi-needle-bed technology and fully-fashioned knitting technology in inland and could be applied to most of control systems in the master-slave mode. The knitting row data and pattern row data in a ＂ ＊. ptn＂ format file were integrated. Giving a corresponding analytic calculation process of control data and realizing independent development of the upper machine and the lower machine, the final knitting control data not only have low computation and transmission cost but also have fast transfer speeds.

On-line Chatter Detection Using an Improved Support Vector Machine

On-line chatter detection can avoid unstable cutting through monitoring the machining process.In order to identify chatter in a timely manner,an improved Support Vector Machine(SVM)is developed in this paper,based on extracted features.In the SVM model,the penalty factor(e)and the core parameter(g)have important influence on the classification,more than from Kernel Functions(KFs).Hence,first the classification results are conducted using different KFs.Then two methods are presented for exploring the best parameters.The chatter identification results show that the Genetic Algorithm(GA)approach is more suitable for deciding the parameters than the Grid Explore(GE)approach.

On-line Condition Monitoring and Diagnostic Network System for Rotating Machine Set

Several industrial computers and a server are combined to set up the on-line monitoring and diagnostic system of turbo-generator sets. The main function of the system is to monitor machine sets' running condition. Through analyzing running data, technicians can detect whether there exist faults and where they occur. To share and transmit the dynamic information of the turbo-generator sets, a distributed network system is introduced. NetWare network operating system is used in the LAN (Local Area Network) system. The LAN is extended to realize the sharing of data and remote transmission of information. Furthermore, functions of monitoring and diagnostic clients are listed.

Panda Brand Series Knitting Machines

The Panda brand series knitting machines is produced by the Nanjing Changhong Machine General Plant, a special factory designated by the state to manufacture knitting machines for making woollen knitwear. The plant has imported a complete set of

A Study on Comprehensive Modeling for Errors in on-line Measuring System of Machining Center

Based on the theory of multi-body system (MBS), bine’s and huston’s methods are applied to an on-line measuring system of machining center in this paper. Through the study on modeling technique, the comprehensive model for errors calculation in an on-line measuring System of machining center have been built for the first time. Using this model, the errors can be compensated by soft.ware and the measuring accuracy can be enhanced without any more inveSt. This model can be used in all kinds of machining center.

Development of Warp Knitted Products on RSJ Machine

Products made by Raschel Jacquard(RSJ)high-speed jacquard warp knitting machine are used in ornament and apparel fabrics.However,most products are produced according to the existing samples.The capability of creative design is not enough at home.In this paper,based on the basic features,the knitting methods and the working principles of warp knitting jacquard machines,the rules for manufacturing jacquard products are summarized.The article provides the new thoughts for the development of fabrics,such as the pattern design,changing the cams,power-net and a special technology of without pillar,which were obtained from the practices in a factory.

Fong’s Sold the Biggest Jumboflow Dyeing Machine to Knit Concern

Fong’s National recently shipped three sets of Jumboflow High Temperature Dyeing Machines (figure 1) to Bangladesh-based Knit Concern Ltd.,Of these three sets of machines,HSJ-8T-T28

On-line Estimation in Fed-batch Fermentation Process Using State Space Model and Unscented Kalman Filter

On-line estimation of unmeasurable biological variables is important in fermentation processes,directly influencing the optimal control performance of the fermentation system as well as the quality and yield of the targeted product.In this study,a novel strategy for state estimation of fed-batch fermentation process is proposed.By combining a simple and reliable mechanistic dynamic model with the sample-based regressive measurement model,a state space model is developed.An improved algorithm,swarm energy conservation particle swarm optimization(SECPSO) ,is presented for the parameter identification in the mechanistic model,and the support vector machines(SVM) method is adopted to establish the nonlinear measurement model.The unscented Kalman filter(UKF) is designed for the state space model to reduce the disturbances of the noises in the fermentation process.The proposed on-line estimation method is demonstrated by the simulation experiments of a penicillin fed-batch fermentation process.

局部编织技术的编织原理与应用

为了对局部编织的创新设计提供理论与技术支持,基于SDS-ONE APEX3岛精服装设计系统以纬平针为地组织设计局部编织花样色码,主要从编织与休止针数变化的角度介绍局部编织技术的编织原理,提出不加不减局部编织、减针局部编织与加针局部编织的工艺设计方法,并在电脑横机上编织出织片小样,进一步阐述局部编织技术在二维平面的嵌花色块拼接、镂空肌理的孔眼效应、三维立体的凹凸造型以及结构轮廓成形编织方面的应用。通过对比分析花样色码与织片小样,指出局编加减针规则与先后顺序、吊目方式、色纱组合等因素对局编织片外观的影响,对局部编织技术在针织创意花型开发与成形编织方面的应用具有指导意义。

基于自抗扰控制的圆纬机恒张力输纱控制系统设计

针对当前圆纬机积极式送纱方式中存在的纱线张力及输送速度不可任意调节、纱线张力波动大等问题,提出了一种可为圆纬机输送恒定张力纱线的输纱控制系统。构建了以无刷直流电动机速度环为内环、以纱线张力为外环的纱线恒张力双闭环反馈控制系统,通过自抗扰控制技术获取纱线实时动态指标,并对无刷直流电动机目标转速进行调整,最后通过磁场定向控制技术驱动无刷直流电动机。详细阐述了纱线张力的形成机制、纱线恒张力输送控制方案、系统硬件设计及控制算法。输纱测试表明,该控制系统可实现多种类型纱线的恒定张力输送。其中,棉纱张力波动标准差为1.5 cN(300 m/min测试条件),氨纶包芯纱的张力波动标准差为0.33 cN(240 m/min测试条件)。输纱速度的调节范围为0~600 m/min,纱线张力的控制范围为2.0~50.0 cN。

2024中国国际纺织机械展览会暨ITMA亚洲展览会电脑横机述评

介绍2024中国国际纺织机械展览会暨ITMA亚洲展览会参展电脑横机的厂商和设备概况。概述参展电脑横机的最新技术特点,包括:全成形技术的发展、3D虚拟仿真、针织数字化共享工厂等。并分析最新机型情况:CX3-S系列全成形电脑横机及ADF530-32KiFLEX多功能电脑横机等。此次展览会具有明显的技术进步,为企业创新产品研发和行业进步提供支持。

袜类三维模型生成编织参数方法及其应用

对于具有高精度设计要求的压力袜、医疗袜等定制产品,现有定制设计方法仅能保证足长、足高等关键数据准确性,存在无法全方位满足定制用户足部数据要求的问题。基于模拟编织的思想,提出了一种由袜子三维模型全自动生成模拟袜机编织的编织路径图的方法。其中编织路径图的生成方法为:采样点由袜口开始沿着采样轴方向在袜类三维模型表面迭代采样用以模拟圆袜机的逐圈编织,并在采样过程中根据采样轴与三维模型顶点法向量的夹角调整线圈高度,直至完成袜头部分的迭代采样。然后将得到的编织路径图进行编译,得到各线圈圈高参数以及各部段圈数参数。最后以该参数修改WLT-6F袜机编织所需的链文件进行上机编织。对比样品与输入三维模型的尺寸差距,其误差处于4.1%以内。

基于苏州地域文化的针织旗袍设计与工艺研究

文章对苏州地域文化可视化元素进行提炼,设计相关图案,并应用于针织旗袍及其配饰设计中。从针织旗袍的廊型、提花组织选择、局部结构创新设计、针织工艺实现手法4个方面进行实践研究。在电脑横机编织实践中,运用收放针、加弹力丝、衣片边缘包边处理等方法,处理针织旗袍较大的胸腰差和腰臀差,通过组织变化处理局部造型,更好地呈现出迎合当代人们生活需要与精神需求的针织旗袍,旨在让旗袍文化和苏州地域文化得到进一步发扬,亦使国内的针织服装具有鲜明的地域特征,设计出具有差异化以及将传统文化与流行元素相融合的针织产品。

基于设计与工艺一体化技术的毛衫产品开发

为了提高针织毛衫产品开发的效率和品质,更好的满足消费者对针织毛衫多元化的需求,依托电脑横机编织技术,结合毛衫设计原理和工艺技术,通过创作实践的方法,详细介绍针织毛衫从款式、色彩、图案设计到结构、版制、工艺制作的一体化研发过程,并分析设计与工艺一体化技术在毛衫产品开发中的优势。结果表明,采用“一人多岗”的研发模式,由一名复合型专业研发人员借助电脑横机的软件系统和控制系统,完成毛衫研发过程中设计、工艺、制版、编织等各个环节的工作,实现毛衫开发的设计与工艺一体化,从而缩短产品研发周期,降低成本,为毛衫设计师提供创作思路,为毛衫产品开发提供参考。

凹凸立体肌理织物在电脑横机上的开发

为提高毛衫设计人员的织物组织创新设计开发能力,设计出满足消费者需求的时尚化、个性化毛衫,通过将毛衫织物组织设计与编织工艺、纱线弹性、织物组织特性相结合,在斯托尔电脑横机上设计开发了立体效果明显、富有创意的凹凸立体肌理织物。文章从移圈组织、集圈组织、局部编织、变线圈长度编织、不同组织的组合、不同弹性的纱线组合使用等方面,分析各种凹凸立体肌理织物的形成原理、编织方法和外观效应,并对其设计要点及注意事项进行探讨。

电脑横机三维间隔织物应用与工艺研究

作为一种新型缓冲材料,间隔织物由上下两个表面和中间的间隔层组成。在间隔织物中,针织间隔织物具有轻质、保暖、透气和富有弹性等特点。针织间隔织物分为针织经编间隔织物和针织纬编间隔织物,这里主要介绍纬编间隔织物在纺织领域的应用现状,并归纳整理纬编间隔织物在电脑横机上的编织工艺。在此基础上,参考纬编轴向织物的编织原理,进一步提出一种新型间隔层添加增强纱的纬编间隔织物。结果表明:这种新型织物通过在间隔层中添加具有高强度和耐用性的增强纱,提高了织物整体性能,为后续研究和产品开发提供了新的思路和参考。

基于数字孪生的磁悬浮织针监控研究与应用

针对磁悬浮针织设备织针运行速度快、故障难检测的特点,提出了一种基于数字孪生的磁悬浮织针监控系统架构,旨在实时监测磁悬浮针织设备,特别是织针的运行状态。该系统架构采样数字孪生五维模型为基础,对磁悬浮针织设备在该模型中的构成要素进行了深入分析。进而,详细阐述了在此监控架构中虚拟实体的开发、孪生数据的采集以及织针故障诊断等关键技术。最后,依托所提架构,针对一种新型管式磁悬浮针织圆纬机设备开发一套在线监控系统,并通过实际应用验证了所提架构的有效性。

自编针织附件工艺设计方法研究

文章介绍了针织产品在电脑横编机上自带附件的编织方法,包括:自编领条、自编口袋、自编卷边、自锁扣眼4种编织工艺设计。通过分析电脑横编机的编织原理和针织物附件设计,构思并绘制线圈结构图和编织意匠图,分别阐述4种工艺的编织原理和编织方法,并配有每种编织工艺的实物图。该设计方法的研究开拓了设计人员的思路,是智能针织产品研究及开发的基础。对于加工生产企业而言,在提高生产效率、减少生产工序、降低生产成本等方面起到了不可忽视的作用。