感知模式对织物柔软性评价结果的影响

目前在织物柔软性的感官评价中,没有讨论感知模式(感觉模态和触摸方式)对评价结果的影响,导致评价结果间没有可比性,且评价方法难以标准化.通过让实验者在不同感觉模态(触觉单模态、视觉单模态和触视觉双模态)和触摸方式(捏持弯曲、弯曲按压和平置按压)下感官评价织物样品,对结果进行多元统计分析,讨论感知模式对织物柔软性感官估值的影响及不同感知模式之间的差异.研究表明,总体上感知模式对织物柔软性的影响不显著,但不同的触摸方式对较厚且压缩性好的织物影响显著;而对薄且弯曲刚度高的织物,柔软感估值在视觉单模态和触觉环境之间有显著差异.另外,就任一织物样品而言,全体实验者对其柔软感强度估值服从正态分布规律.研究结果为织物柔软感评价体系的完善提供依据.     

不同感觉模态下评价织物柔软感的心理物理特性

分别在触觉单模态和视触觉双模态下,采用平置按压和捏持弯曲的触摸方式,通过与参考织物对比评价织物试样的柔软感.采用相关性分析确定影响织物柔软感的主要物理指标,以该指标为刺激量用logistic函数拟合正确判断率,计算辨别阈值.研究表明,在不同感知模式下,织物柔软感的感官评价符合logistic心理计量函数,且视触觉双模态下捏持弯曲的评价方式对织物柔软性的感知敏感度最高.     

Experimental Study on Pull-out Behavior of Different Geotextiles

The pullout testing of geosynthetics is essential for studying interface interaction in the soil-reinforcement system. In this paper, a new method for testing interface properties of geotextiles is proposed. The interface frictional characters of two kinds of geotextiles (woven and needle-punched nonwoven) are investigated through pullout test.Nonwoven specimen has more wide variety of displacement along length than that of woven under the same pressure because of their different exteusibility. The greater the elongation and deformation of specimens, the more evident the variations of displacement along reinforcement from front to pullout end. The greater the normal pressure, the smaller the displacement of every position along length with the same pullout load. The study focuses on the effects of the tensile modulus and the difference of pullout response between woven and nonwoven geotextiles.     

矩形及其组合横截面立体编织物四步法编织纱线运动模拟

根据四步法编织的实际生产过程,利用Visual Basic6编写了“四步法编织模拟”应用程序,该程序可以模拟矩形以及其组合横截面立体编织物四步法编织过程中的纱线运动,有助于分析和设计立体编织物的结构,并可以扩展到对四步法编织机生产的自动控制。     

纬纱在织口处的运动

本文在假设纬纱的抗扭刚度为有限值的基础上,建立了平纹织物在织口处组织单元的数学模型。利用所建立的模型,分析了纬纱在织口处相对于经纱的可能运动形式;讨论了不同形式的纬纱运动对打纬阻力的影响;找到了传统理论与实际存在矛盾的可能解释。最后,举例阐述了纬纱在打纬过程中,在织口处往复运动的经过。     

掺杂剂浓度对聚吡咯/棉织物心电电极性能的影响

以吡咯(Py)单体为原料、过硫酸铵(APS)为氧化剂、1,5-萘二磺酸(NDSA)为掺杂剂,采用化学氧化沉积法制备聚吡咯/棉织物心电电极.通过改变掺杂剂浓度制备了织物心电电极试样.利用电化学阻抗谱、循环伏安曲线、开路电压法等,讨论掺杂剂浓度对织物心电电极性能的影响.结果表明,当吡咯浓度为0.04mol/L、过硫酸铵浓度为0.02mol/L时,随掺杂剂浓度的增加,织物电极的方阻和极化阻抗均降低,电化学性能变好,且电极稳定性增加;掺杂剂浓度增至0.004 5mol/L,织物电极方阻可降到1kΩ以下,阻抗值相对较小,电极稳定性较好,心电信号测试质量较高,而掺杂剂浓度继续增加,心电电极性能提高的趋势不明显.     

Influence of Surface Topography on the Tactile Friction of Medical Compression Textiles against a Mechanical Skin Model

Influence of surface topography on the tactile friction of medical compression textiles was studied in this paper. The friction behavior was investigated for three kinds of medical textiles with various structures and compositions by using a textile friction analyzer under dry condition. In order to simulate the contacts of textiles/human finger, a mechanical skin model with similar texture to the skin and applied normal load oflN were selected. Meanwhile, the 3D surface topography of textiles was measured using a digital microscope. The topographical data were analyzed concerning height distribution and material ratio, and the real contact area was estimated as a function of penetration depth. Results showed that the investigated textiles revealed a significant variation on the friction coefficients, which were （ 0.41 ± 0.01 ） （ polyamide, jersey 2 × 2 ）, （0.56 ± 0. 01） （cotton, jersey 2×2） and （0. 47 ± 0. 01） （polyamide, jersey 1 × 1 ）, respectively. The textile with higher friction coefficient was found to own a relative compact and homogenous surface and larger contact area, vice versa.     

纵横编织中的置换理论

在应用编织图表示纵横编织的基础上，定义了编织方格阵，然后将方格阵抽象为集合，使编织过程抽象为对集合中元素的置换。以“4步法”编织为例，应用置换理论分析了编织过程，将一个编织循环的置换结果表达成不相交的轮换的积的形式，建立了锭子运动规律与轮换表达形式的对应关系。随后，应用导出的对应关系分析了“8步法”的编织过程，计算出方格阵的初始状态，说明了置换理论对于纵横编织规律描述的普适性。     

包缠结构预混料热压过程中树脂浸渍分析

建立了包缠结构顸混料热压过程中树脂的浸渍模型。结果表明,实验值和模型的预测值吻合较好,该模型可以用于包缠结构预混料热压过程中浸渍时间的预测。利用该模型对混合结构预混料的进一步研究发现,包缠结构预混料中丝束的完全浸溃时间仅略长于混合结构预混料。     

The Bundle Effect of UD - laminate Made of Friction Spun Core Yarn as Premix

Consolidation of thermoplastic unidirectional(UD)lami-nate with friction spun core yarns was investigated,espe-cially the characterization of filament bundles in consoli-dation was analyzed.The results showed that the bundleeffect was affected considerably by processing conditions(applied pressure and processing time).The boundaryof the bundles was disappeared under suitable processingconditions and finally an even fiber/resin distributioncould be attained.In consolidation,filament bundlesgetting close each other and resin flowing into the bundl-es occurred simultaneously,and eventually the bundleswere fully impregnated by the resin.Fiber packing den-sity in UD-laminate was the same as that of frictionspun core yarn(55%-65% in volume)and was not af-fected significantly by processing conditions under thecurrent experimental conditions.