Weft knitted fancy fabrics are widely used in knitted garment design. Due to the complexity of the structures, their modeling and simulation needs to be solved in three-dimensional (3D) CAD developments. In this paper...Weft knitted fancy fabrics are widely used in knitted garment design. Due to the complexity of the structures, their modeling and simulation needs to be solved in three-dimensional (3D) CAD developments. In this paper, 3D loop geometrical models of weft knitted fancy structures, including tuck stitch, jacquard stitch, transfer stitch and fleecy stitch, were developed based on an improved model of plain loop, and their central axes as some 3D space curves were achieved by using Non-Uniform Rational B-Splines (NURBS). The 3D visual simulation programme was written in C++ programming language using OpenGL, which was a function library of 3D graphics. Some examples of weft knitted fancy fabrics were generated and practical application of 3D simulation was discussed.展开更多
In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardwar...In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology.展开更多
A study is reported for mathematical model and simulation of complex structure fancy yarns. The investigated complex structure fancy yarns have a multithread structure composed of three components - core, effect, and ...A study is reported for mathematical model and simulation of complex structure fancy yarns. The investigated complex structure fancy yarns have a multithread structure composed of three components - core, effect, and binder yarns. In current research the precondition was accepted that the cross-sections of the both two yarns of the effect intermediate product in the complex structure fancy yarn remain the circles shaped, and this shape does not change during manufacturing of the fancy yarn. Mathematical model of complex structure fancy yarn is established based on parameter equation of space helix line and computer simulation is further carried out using the computational mathematical tool Matlab 6. 5. Theoretical structure of fancy yarn is compared with an experimental sample. The simulation system would help for further the set of information in designing of new assortment of the complex structure fancy yarns and prediction of visual effects of fancy yarns in end-use fabrics.展开更多
目的:探究花样跳绳运动对大学生在等速条件不同角速度、模式下膝关节屈、伸肌峰值力矩、屈肌群与伸肌群峰值力矩比值的影响。方法:选取高校学生48名,随机分为实验组和对照组各24人,对实验组进行12周跳绳干预。运用Iso Med 2000等速测试...目的:探究花样跳绳运动对大学生在等速条件不同角速度、模式下膝关节屈、伸肌峰值力矩、屈肌群与伸肌群峰值力矩比值的影响。方法:选取高校学生48名,随机分为实验组和对照组各24人,对实验组进行12周跳绳干预。运用Iso Med 2000等速测试系统于干预前后采集受试者角速度为60°/s、200°/s条件向心、离心模式下膝关节屈、伸肌峰值力矩(peak torque、PT)及屈、伸肌群峰值力矩比值(hamstring/quadriceps、H/Q)数据,数据处理组内采用配对样本T检验、组间采用独立样本T检验。研究结果:(1)干预后实验组男女生等速测试60°/s向心模式下伸肌、离心模式下屈、伸肌及200°/s条件,向心、离心模式下屈、伸肌PT值均显著提高(P<0.05);(2)实验组男生60°/s He/Qc、Hc/Qe值均低于对照组(P<0.05),200°/s Hc/Qe值显著低于对照组(P<0.01),实验组女生60°/s及200°/s He/Qc值均低于干预前(P<0.05)。研究结论:(1)12周跳绳训练可提高大学生膝关节屈、伸肌最大肌力,男生在快速条件尤其离心模式下膝关节屈、伸肌肌力变化显著,女生在慢速条件下屈、伸肌肌力变化更为显著;(2)跳绳训练使大学生膝关节屈、伸肌比例趋于合理化,动态平衡稳定能力得到提高。展开更多
基金Natural Science Foundation of Tianjin,China( No. 11JCYBJC26400) Tianjin High School Scientific and Technology Fund Planning Project,China( No. 20100310)
文摘Weft knitted fancy fabrics are widely used in knitted garment design. Due to the complexity of the structures, their modeling and simulation needs to be solved in three-dimensional (3D) CAD developments. In this paper, 3D loop geometrical models of weft knitted fancy structures, including tuck stitch, jacquard stitch, transfer stitch and fleecy stitch, were developed based on an improved model of plain loop, and their central axes as some 3D space curves were achieved by using Non-Uniform Rational B-Splines (NURBS). The 3D visual simulation programme was written in C++ programming language using OpenGL, which was a function library of 3D graphics. Some examples of weft knitted fancy fabrics were generated and practical application of 3D simulation was discussed.
文摘In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology.
文摘A study is reported for mathematical model and simulation of complex structure fancy yarns. The investigated complex structure fancy yarns have a multithread structure composed of three components - core, effect, and binder yarns. In current research the precondition was accepted that the cross-sections of the both two yarns of the effect intermediate product in the complex structure fancy yarn remain the circles shaped, and this shape does not change during manufacturing of the fancy yarn. Mathematical model of complex structure fancy yarn is established based on parameter equation of space helix line and computer simulation is further carried out using the computational mathematical tool Matlab 6. 5. Theoretical structure of fancy yarn is compared with an experimental sample. The simulation system would help for further the set of information in designing of new assortment of the complex structure fancy yarns and prediction of visual effects of fancy yarns in end-use fabrics.
