Computer Simulation on Metallic Card Clothing Garnett Wire Teeth''''s Temperature Field & Structure Field in the Process of Quenching Treatment

IntroductionMetallic card clothing is ani mportant part of the cardmachine . According to the textile industry criterion (FZ/T93038 95) ,the micro-hardness of four testing points onthe garnett wire teeth should be tested in order to decidewhether it is up to standard or not . Fig .1showsschematically these four testing points on a garnett wiretooth of metallic card clothing . The first testing point ofmicro-hardness is at0.05 0.1mm from the tip of thetooth and its value of micro-hardness req…     

The Process Analysis of the Roller Stretching for Wool Slenderization

A theoretical estimation for the multiple-drawinghas been derived under the consideration of fiberlength distribution for the wool fiber stretchingsystem. The functions of the roller drawing systemand the parameters in stretching process have alsobeen analyzed. The theoretical algorithms have been     

Prediction of Final Velocity of Aramid Fabric-Resin Composite Laminates Subjected to Ballistic Impact

The strain rate effects of aramid fiber material, quasi-static and ballistic impact perforation of composite laminates made of aramid fabric and phenolic resin/PVB are investigated respectively by means of MTS, split Hopkinson tension bars and ballistic impact apparatus. The tensile impact experiments on aramid fiber material are performed in strain rate range from 0.01/s to 1000/s. Experimental results show that the mechanical properties of aramid fiber material are insensitive to strain rate in the range from 0. 01/s to 1 000/s. An energy model to predict final velocity of composite laminates subjected to ballistic impact is proposed on the basis of experimental data of quasi-static perforation through the targets. The predicted final velocities show good agreement with the experimental final velocity.     

Direct and Inverse Kinematic Analysis of a Leg-wheeled Passive Wheel Mobile Robot - Ice-skater Robot

A new passive wheel type of leg-wheeled mobile robot based on rolling principle was introduced. To enhance the stability and maintain vertical to the ground of wheels, four passive wheels were installed at the end of four legs respectively and parallel mechanisms were used as legs. And an inertia coordinate system and a robot coordinate system were established, the related kinematic equation of the robot was gotten according to some assumptions after the configuration or the posture of wheels and legs was analyzed. At the same time, the turning conditions of the robot were also obtained. Based on the motion principle, the VSS-based logic control system was designed and the skating straight experiments and the turning experiments were conducted. And some conclusions were drawn.     

Job-shop Scheduling with Multi-objectives Based on Genetic Algorithms

The technology of production planning and scheduling is one of the critical technologies that decide whether the automated manufacturing systems can get the expected economy. Job shop scheduling belongs to the special class of NP-hard problems. Most of the algorithms used to optimize this class of problems have an exponential time; that is, the computation time increases exponentially with problem size. In scheduling study, makespan is often considered as the main objective. In this paper, makespan, the due date request of the key jobs, the availability of the key machine, the average wait-time of the jobs, and the similarities between the jobs and so on are taken into account based on the application of mechanical engineering. The job shop scheduling problem with multi-objectives is analyzed and studied by using genetic algorithms based on the mechanics of genetics and natural selection. In this research, the tactics of the coding and decoding and the design of the genetic operators, along with the des     

Research on Garment Pattern Intelligent Design System

This article discusses the disadvantages of current computer aided garment design system first, and then brings forward the frame of intelligent garment design system. Based on the analysis of the structure of the intelligent system, it is pointed out that the intelligent pattern design system is the most important module of the whole system. The use of an expert system to realize the intelligent pattern design system is then proposed and the key technique of the system is discussed at last.     

Evaluation of College English Test

There has been much heated discussion on College English Test for non-English majors Band 4 and Band 6 because it has exerted great influence on English teaching in Chinese universities. This essay is intended to explore the reliability, validity, practicality and washback of this large-scale test by focusing on CET Band 4. The author of this report discusses the merits as well as some existing problems of this test and offers some suggestions at the end of the essay.     

Effect of Stretching - Setting Treatment on Dyeing Behavior of Wool

Changes of dyeing behavior of wool after stretching -setting treatment are studied. Effects of stretching -setting on wool structure are analyzed. It is concluded that stretching - setting treatment not only reduces wool diameter and increases wool length, but also brings about low-temperature dyeing of wool.     

Analytical Algorithms for the Blend Ratios by Fibre-bundle Tensile Curves Part Ⅲ： The Definition Method and the Relationships between the Blend Ratio and Tensile Parameters Calculated from Different Ways

The algorithms of the strength, work, modulus and percentage methods have been introduced and discussed in Part Ⅰ and Part Ⅱ of the series papers. As the following, the percentage-function calculation and the frequency-function calculation of the definition method are defined and developed in detail. Meanwhile, the Procedures to fred the tensile parameters are analysed experimentally and involve “ED” being the average values of the corresponding tensile parameters of each bundle tensile curve measured; “EC” being the tensile parameters obtained from the averaged experimental tensile curve; and “TC” being the parameters of the theoretical tensile curve according to the corresponding nominal blend ratio. The theoretical and experimental results indicate that the blend ratio estimated by the definition method from wool/polyester blended fibre bundles has a high correlation with the actual blend ratio though the variables to be known in this method are the most of all the methods and there exist the difficulty to solve fibre bundle tensile behaviour without fibre broken in accuracy and that there are high correlations between the EC and TC data and the tensile parameters should be calculated using the EC method rather than the ED method with the exception of the bundle initial modulus. The relationships between blend ratios and the tensile properties of blended fibre bundles can be used to select the optimum blend ratio of blended tops or yarns.     

一类复杂非线性过程的广义一般模型控制

介绍了一般模型控制（ＧＭＣ）的基本原理,给出了ＧＭＣ方法简单实用的必要条件。针对ＧＭＣ方法只适于相对阶ｒ为１的简单过程的缺点,采用Ｌｉｅ导数的概念,令过程输出的ｒ阶导数的轨迹为事先设定的标称轨迹,通过解优化问题得到控制律表达式,把ＧＭＣ方法推广至相对阶ｒ大于１的复杂多输入多输出过程,从而提出了一种广义一般模型控制（ＧＧＭＣ）方法。仿真结果表明,提出的方法能应用于相对阶ｒ大于１的复杂非线性过程的控制,当采用线性近似模型时,其控制性能与模型预测控制（ＭＰＣ）相近,而计算量则有所降低。