Drying of Prone to Twist Boards in a Pre-Twisted Position

A method to minimize twist has been investigated; i.e., drying the boards in a pre-twisted position. It has been found that Norway spruce boards can be deformed toward straightness by this method. The force exerted by a board on its holders during drying in a pre-twisted position has been measured. When the variation in torsional stiffness as a function of temperature and moisture content is accounted for, it is found that a creep deformation of the board occurs both during the drying phase and the cooling phase. In addition to mechano-sorptive creep, a deformation released by a change in temperature also seems to occur.     

台达机电产品在高速集束球经机中的应用

本文主要介绍台达20PM运动控制器在纺织行业的高速集束球经机中的应用。阐述了球经机的技术特点和工艺要求,简介了控制系统的硬件配置和应用程序。在控制系统中利用20PM内置的多组电子凸轮功能实现了两边成型和精密绕排等各项工艺目标。     

Improved GPU SIMD control flow efficiency via hybrid warp size mechanism

High single instruction multiple data (SIMD) efficiency and low power consumption have made graphic processing units (GPUs) an ideal platform for many complex computational applications. Thousands of threads can be created by programmers and grouped into fixed-size SIMD batches, known as warps. High throughput is then achieved by concurrently executing such warps with minimal control overhead. However, if a branch instruction occurs, which assigns different paths to different threads, one warp will be broken into multiple warps that have to be executed serially, consequently reducing the efficiency advantage of SIMD. In this paper, the contemporary fixed-size warp design is abandoned for a hybrid warp size (HWS) mechanism. Mixed-size warps are generated according to HWS and are scheduled and issued flexibly. The simulation results show that this mechanism yields an average speedup of 1.20 over the baseline architecture for a wide variety of general purpose GPU applications. The paper also integrates HWS with dynamic warp formation (DWF), which is a well-known branch handling mechanism used to improve SIMD utilization by forming new warps out of split warps in real time. The simulation results show that the combination of DWF and HWS generates an average speedup of 1.27 over the DWF-only platform with an estimated area increase of about 1% of DWF.     

织机经纱张力自适应控制的研究

本文首先分析了一类喷气织机的电子送经控制系统,通过分析经纱的受力情况和经纱的形变情况,建立经纱张力模型。给出了系统的控制方案,推导出了经轴半径在线辨识公式。通过现场调试,该系统已实现正常工作,经纱张力稳定,织物的质量提高了。     

Lyocell经弹织物结构相及其与织物弹性的关系

采用纱线形态扫描法对不同经纬配置的Lyocell经弹织物进行了测定。结果表明 Lyocell经弹织物的结构相为6以上,是经支持面织物,这表明经纱的原料对织物的表面性能将有更重要的影响。并捻法生产的经弹织物是非紧密结构织物,在织物的经纬纱交织处存在明显的空隙,空隙和经线屈曲波高的增加均对织物的弹性有利。     

单片机在织机送经系统中的应用

本文阐述了如何提高织机送经机构送经均匀性的问题，重点对采用单片机控制织机送经系统的实现方案进行了论述，最后对单片机控制送经系统的运行情况及推广使用作了说明。     

Improving branch divergence performance on GPGPU with a new PDOM stack and multi-level warp scheduling

General-purpose graphics processing unit (GPGPU) plays an important role in massive parallel computing nowadays. A GPGPU core typically holds thousands of threads, where hardware threads are organized into warps. With the single instruction multiple thread (SIMT) pipeline, GPGPU can achieve high performance. But threads taking different branches in the same warp violate SIMD style and cause branch divergence. To support this, a hardware stack is used to sequentially execute all branches. Hence branch divergence leads to performance degradation. This article represents the PDOM (post dominator) stack as a binary tree, and each leaf corresponds to a branch target. We propose a new PDOM stack called PDOM-ASI, which can schedule all the tree leaves. The new stack can hide more long operation latencies with more schedulable warps without the problem of warp over-subdivision. Besides, a multi-level warp scheduling policy is proposed, which lets part of the warps run ahead and creates more opportunities to hide the latencies. The simulation results show that our policies achieve 10.5% performance improvements over baseline policies with only 1.33% hardware area overhead.     

JWG1724型剑杆织机的纬密控制

介绍了ＪＷＧ１７２４型检杆织机纬密机构的工作原理及构成,分析了该机构纬密调整范围的计算。     

织造经丝及断头的形貌观察和分析

就剑杆织机上织造经丝及其断头的表面形貌进行了观察分析,结果表明:经丝在织造过程中会逐步形成各种裂纹,但能导致经丝断头的裂纹仅为极少数;通常,织机综框区的断头是疲劳断头,其中完全松散断头约占20%,不完全松散断头约占80%,综前区的断头主要是冲断头,约有60%的断头是由于开口不清剑杆头冲断所致。