基于局域网的相邻路口交通灯协调控制系统的设计

为了缓解城市交通拥堵等交通现状,研制了由欧姆龙PLC做下位机控制器,组态王做远程监控软件的双路口协调控制交通灯实验系统。该实验系统具有实时车流量检测、分时段控制、手动控制、无线遥控控制、急车通行功能。监控计算机通过局域网对交通路口进行远程监控。实验证明,该系统稳定性好,功能完备,人机界面友好,可减少堵塞现象和交通事故,具有很好实际应用价值。     

强奇异积分算子及其交换子在加权Morrey空间上的有界性

设T是强奇异积分算子,b∈BMO(Rn).本文考虑了T及其交换子[b,T]在加权Morrey空间Lp,k(ω),1相似文献   

多线性Marcinkiewicz算子在变指数Herz-Morrey空间上的有界性

研究了多线性Marcinkiewicz算子在变指数Herz-Morrey空间上的有界性,也是经典Marcinkiewicz算子在变指数Herz-Morrey空间上的推广.使用特征函数和空间分解原理,将算子分为4个部分,核函数所满足的尺寸条件,对算子进行估计,得到算子在变指数Herz-Morrey空间上的有界性.     

弹性电机座的节能作用

弹性电机座是作者发明的一种新型节能装置。本文对装备了这种装置的有梭织机系统在各种类型的织机阻力矩作用下的动态响应作了全面分析。理论和实验结果都表明,采用弹性电机座能够有效地降低织机驱动电机的转速不匀率和电动机输入功率。经在1511型织机上使用,测得其最高节电率可达19.4%。通过对弹性电机座和弹性皮带盘特性的比较,作者还提出了节电装置的改进设想。     

THE POTENTIALITY OF ENERGY-SAVING IN SHUTTLE LOOMS

In this paper,the effects of loom speed fluctuation on the mean speed and on the power ofdriving motor were investigated and the expressions for these effects were derived.Based on theenergy relationships,a new index of equivalent fluctuation was introduced,the connection be-tween this equivalent fluctuation and the energy of speed function on frequency domain was thenfound.In addition to the above theme,the residual kinetic energy of the shuttle and pickingmechanism,taken as a considerable part in the potentiality of loom energy-saving was also ana-lysed.According to the results of theoretical analyses,the ways of energy-saving in looms weresuggested.Finally,taking the loom of 1511 type as a practical example,the potentiality ofenergy-saving was calculated.     

ANALYSIS AND DESIGN OF LOAD-UNIFORMING MANGLE ROLLERS WITH AXIALLY-STAGGERED CONTACT

It is desirable to get a uniform load distribution for the pressure rollers of the mangle.In thispaper,the load uniforming principle of the axially-staggered pressure rollers and the rules for theroller design have been analysed by the theory of bending of beams.The ratio of maximum tominimum value of the distributed load in the nip being taken as a useful index to describe the uni-formity of the load distribution,the performance of the so-called load-uniforming pressure rollerswith rubber covering,under various operation conditions,has been evaluated.As a result,it isproved that the load-uniforming pressure rollers with axially-staggered contact is a pratically use-ful means of uniformizing the load distribution,which ensures that the mangle will squeeze the ma-terial to be processed uniformly over its whole width under any technological load,and needs onlysome simple regulations.The conclusions obtained in this paper can easily be extended to the pressure rollers with anysupport conditions.     

织物的喷气脱液方法

本文从液体在多孔介质中的渗流机理入手,运用流体动力学方法,分析了织物通过高速气流通道时。纱线间液体及纱线内纤维间液体的去除过程,建立了织物喷气脱液的力学模型。在对织物脱液效果及其影响因素分析讨论的基础上,对针织物试样进行了喷气脱液效果的实际测定,其结果与理论分析基本一致。     

Sliding Mode Control Approach for Electrically Controllable Clutch of AMT Based on the Feedback Linearization

A sliding mode control approach based on the feedback linearization is proposed for the electrically controllable clutch of AMT vehicles. The nonlinear dynamic model for the hydraulic actuator associated with clutch is established. By means of the exact feedback linearization procedure of differential geometry, an equivalent, fully controllable and linear model is derived via a homomorphic transformation for the AMT clutch system. Furthermore, a sliding mode control is introduced to improve robustness. The tracking tests are performed using the sliding mode control on a Santana LX passenger car, and the experimental results prove that this nonlinear controller is of fine robustness and high degree of tracking accuracy.     

谈谈降低线损的技术基础和管理措施

降低电网损耗的技术措施包括需要增加一定投资对电力网进行技术改造的措施和不需要增加投资仅需改善电网运行方式的措施。如改善网络中的功率分布、合理安排运行方式、调整运行参数、调整负荷均衡、合理安排检修、对原有电网进行升级改造、简化网络结构、合理选择导线截面等。这一方面的办法，在现今城农网改造完成后，是不可以再大规模实施的。一台低损变压器的使用周期最低算15年，更换也不是一朝一夕的事情，成本如此昂贵。另外，作为电网的运行方式，在电网的建设当中，已经设计好的，最起码也要过一个五年计划才可以有所变更。这就局限了我们在日常的降损工作中，技术措施只能是对未来几年的规划，而不是有效可行的方法。随着自动装置的越来越先进，动态无功补偿越来越多的使用，整个电网运行处于一种低损状态，靠技术措施降低损耗的能力就越来越小。目前我们所做的降损工作只能建立在低损的技术基础上。在现有的技术基础条件下，进行达到我们降低线损目标的工作。从加强对计量表计、线损目标和内部用电等的管理及开展营业普查、反窃电活动、线损理论分析决策等方面切合实际地降低电网线损。并介绍了在线损管理中采取的一些较有成效的管理措施，望同行比较借鉴。     

织物动态轧液特性的研究

作者将织物的轧液过程作为一个动力学过程来考虑,研究了其轧液机理,分析了各种因素对轧液效果的影响。并且发现流体动压力是构成轧辊阻力矩的主要成分,它随织物运行速度增大而增大。还阐明前孔区内流体的渗透速度梯度是引起织物拉伸变形的原因。文章还给出了如织物渗透系数等重要参数的计算方法,并提出了降低轧余率以及减少织物拉伸损伤的设想。