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首页> 外文期刊>Vlakna a Textil >THE MECHANICAL VIBRATIONS OF THE SEWING MACHINE'S NEEDLE PART 2: THE FREE LONGITUDINAL VIBRATIONS
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THE MECHANICAL VIBRATIONS OF THE SEWING MACHINE'S NEEDLE PART 2: THE FREE LONGITUDINAL VIBRATIONS

机译：缝纫机针第2部分的机械振动：自由纵向振动

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摘要

It is well known that the free vibrations of the sewing needle are divided to lateral free vibration and axial (longitudinal) free vibrations. In this study a theoretical approach will be carried out concerning the sewing needle free longitudinal (axial) vibrations. The work will include the sewing needle with constant cross-section with classical and non-classical boundary conditions and needles with variable cross-sections - stepped - type. For all the different calculations scheme of the sewing needles, two items will be emphasized: the linear natural fundamental frequencies and the modal sewing needle shape (normal equations) and time - dependent vibratory pattern of the needle. The sewing process technology of the sewn fabrics has several parameters affecting the free longitudinal (axial) vibrations of the sewing needle as: sudden end breaks, the fabric resistance to the needle penetration: is it elastic or rigid or between both of them ... etc. In addition the penetrating needle force in the sewn fabric, how is it type of relationship with time of penetration? In this study we assumed it is as P - P0 sin wt i.e sinusoidal. The effect of the needle linear speed on the modal shape of the sewing needle was evaluated. Also, it has been found the frequency equation of needle axial vibration under the effect of sewing thread break.
机译：众所周知，缝纫针的自由振动分为横向自由振动和轴向（纵向）游离振动。在这项研究中，将对缝纫针自由纵向（轴向）振动进行理论方法。该工作将包括缝纫针，具有恒定的横截面，具有经典和非经典的边界条件和具有可变横截面的针头 - 阶梯式。对于缝纫针的所有不同计算方案，将强调两种物品：线性自然基本频率和模态缝纫针形（正常方程）和针的时间依赖振动图案。缝制织物的缝纫过程技术有几个参数影响缝纫针自由纵向（轴向）振动，如：突然的末端突破，织物抗针穿透：它是弹性或刚性的，或者在它们中都有弹性或刚性。另外，缝制织物中的穿透针力，如何与渗透时间的关系类型？在这项研究中，我们认为它是正弦波的p - p0 sin wt i.e。评价针线性速度对缝纫针的模态形状的影响。此外，已经发现缝纫线断裂效果下针轴振动的频率方程。

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