共查询到17条相似文献,搜索用时 62 毫秒
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针对簇绒地毯织机高速运行时横移机构易出现机械谐振,影响横移系统快速响应和稳定性的问题,在对横移传动机构进行理论建模的基础上设计了校正补偿装置。首先根据横移传动系统的阶跃响应情况,采用双T型陷波滤波器消除了横移传动系统的机械谐振点。然后使用预变形双线性逼近法对陷波滤波器进行离散化处理,并且与零阶保持器和一阶保持器等离散算法进行了实验对比。结果表明,双T 型滤波器有效地消除了横移机构高速运行时产生的机械谐振,而且在频域特性方面,采用预变形逼近法设计的离散陷波滤波器可获得比零阶和一阶保持器更加准确的逼近效果。 相似文献
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地毯簇绒过程中簇绒针的力学和运动性能制约了主轴转速的提高,影响着整个机械系统的振动特性,而簇绒针的运动性能直接取决于传动机构的设计。根据地毯簇绒运动的工作原理,设计了由曲柄摇杆机构和曲柄滑块机构组合而成的簇绒针传动机构,并对传动连杆机构的运动进行了数学分析;应用ADAMS仿真软件对不同曲柄参数条件下的传动机构进行运动分析和比较,着重对簇绒针刺入底基布时的运动和受力状况进行讨论,确定了曲柄的最优设计值。分析结果已应用到DHT-200地毯簇绒机的设计实践中。 相似文献
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丝绒是我国具有独特风格的传统产品,它色泽鲜艳,手感柔软,有良好的服用性能,深受国内外人们喜爱。近年来江苏、上海、山东,福建、河北、新疆等地区都在积极发展丝绒生产。开发的品种有乔其丝绒、印花烂乔、锦乔绒(又称锦粘绒)以及阔幅人丝立绒、提花丝绒等等。 丝绒生产技术难度较高,生产正赏与否涉及原料、工艺,半制品质量、设备以及操作技术 相似文献
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为解决空间结构复杂的多圈高簇绒地毯在实现其外观三维仿真时缺乏真实感的问题,利用Rhino环境下的PythonScript实现了簇绒地毯外观的三维仿真。将绒圈中心线及截面曲线分段后局部求解相关控制点坐标,再由B样条曲线对二者进行拟合。同时考虑到地毯绒圈之间的相互挤压导致绒圈发生了随机偏转变形,通过设计算法模拟了绒圈产生形变后的状态。在此基础上添加绒圈表面纹理及光照模型,进一步渲染输出仿真结果。测试结果表明:利用B样条曲线拟合原理并借助于Rhino-Python平台的簇绒地毯三维仿真方法是可行的,且易于实现;与实际地毯样品相比,能够较为真实地模拟不同排纱规律下多种花型图案、绒圈高度变化的簇绒地毯。 相似文献
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TT96型剑杆织机打纬机构分析 总被引:1,自引:0,他引:1
通过MEC B型机械动态参数测试仪 ,对TT96型剑杆织机打纬运动进行测试 ,用计算机处理的有关数据绘制曲线 ,并分析和讨论打纬运动的动态曲线及工艺参数。 相似文献
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开口机构是控制织机运动的关键部件,选好配套的开口机构是提高经济效益的关键.文章就开口机构适应新型织机发展应具备能性能、国内外研发现状等进行了详细探讨,介绍了开口机构与新型织机的配合使用实例. 相似文献
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详细介绍了HGA732T型系列毛巾剑杆织机中2种起毛机构的形式和运动原理,针对机构组成和功能,对2种机构的不同之处以及优缺点进行了比较;从起毛运动规律入手,对其运动参数和力学参数进行了详细的分析;结合实际试验情况,总结出影响毛巾织机性能的一些重要因素,为进一步优化机构提供依据,也为设计其他类型的起毛机构提供参考。 相似文献
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簇绒地毯织机纱线张力是影响提花质量的关键因素,为对其进行有效控制,本文研究了步进电机输入对簇绒提花装置区间绕过纱线张力的动态变化情况。首先建立提花装置的步进电机的负载模型,并分析其角频率输入对输出电磁转矩的对应关系;然后,根据米纳科夫定理的原理,建立纱线段绕过提花罗拉前后纱线动态张力模型。同时,进一步分析步进电机的输入与提花装置绕纱的输出动态张力之间的数学模型,在选定提花罗拉半径r、中心距 、纱线包角 等初始条件下,利用迭代-欧拉法分析其数值变化情况,得出角频率输入与纱线张力输出之间的定量关系,并探究不同包角对纱线动态张力的影响机制,为不同绒高的簇绒地毯甚至满幅簇绒提花地毯的制造和研究提供参考。 相似文献
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Sahar Jafari 《纺织学会志》2013,104(10):1433-1438
Viscoelastic models composing of different combination of spring and dashpot are usually used to explain the mechanical behavior of textile materials. In this work, a viscoelastic model was presented to analyze the effect of traffic exposure on the compression and recovery performance of the pile carpet. Wear test, performed by a Hexapod tumbling machine, was conducted to simulate the traffic exposure. Using a tensile tester, adjusted in compression mode, one cycle of compression–decompression was applied to the samples. The standard nonlinear model was presented to fit the experimental data. Best curve fitting based on the least square method was then used to fit the model to the experimental curve. Different attributions of compression were then analyzed and discussed. The results showed that the standard nonlinear model was fitted to the experimental curves with an acceptable coefficient of regression (R2). The district model parameters, i.e. the spring and dashpot constants, were both decreased as the wear cycles increased. At the higher level of wear cycles, the model parameters showed some increment. The initial compression modulus showed the same trend. This may be explained by the more compactness of the carpet at higher wear cycles. The decompression modulus, compression and the decompression work also decreased with the increase of wear cycles. However, no significant increase of the formers was observed at the higher wear cycles. 相似文献
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Sahar Jafari 《纺织学会志》2017,108(11):1905-1909
Different combinations of spring and dashpot systems are usually considered to model the mechanical behavior of textile materials. In this work, Jeffery’s mechanical model, which is a combination of spring and dashpot components, was used to model the recovery behavior of the pile carpet after static loading. The carpet samples were exposed to different levels of UV radiation. The short-term static loading was applied to the samples. The recovery response or thickness vs. time was then measured. By analyzing this model and using the best curve fitting based on the least square method, the viscoelastic parameters in each UV exposure time were calculated. Four attributes of compression were then studied. The results showed that the thickness loss and the maximum compression under a constant load were mainly dominated by the deterioration of the dashpot elements (Plastic part of deformation). The thickness loss and the maximum compression were both higher at longer UV exposure times. The thickness loss showed a good linear correlation with the inverse of the first dashpot constant, 1/η1. In contrast, the speed of recovery and the potential stored energy were mainly dominated by the parameters of the Voigt–Kelvin body, i.e. the elastic part of the compression. 相似文献
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大米在干热糊化过程中发生剧烈的传热,大米内部存在温度分布并且发生迅速变化,这些变化影响大米的糊化效果。数学模型法可以解决无法直接测量大米内部的温度梯度困难。本研究根据糊化过程传热特征,构建了大米温度梯度变化的偏微分方程,解析并验证了方程的准确性。利用数学模型分析了大米在干热糊化过程温度梯度的变化规律,得出了具有普遍意义的干热糊化过程大米平均温度的标准温度曲线,指导干热糊化过程的控制及设备的设计和放大。 相似文献