A passive false twist unit (spiral) has been developed to assist with the handling lowstrength slivers on a high speed-spinning machine with a high-speed feed. In the first trial, a falsetwist simulator device was constructed to determine whether the passive false twist unit can be usedon high speed feeding with different can distance from the feeding device. In the second trial, theeffects of ...

Taguchi Method is explained in brief and one of the textile processes, called spinning process, is optimised by using Taguchi method for manufacturing optimum packing density of different technologies yarns. The effect of process variables like: lap hank, card draft, draft/doublings and drafts at speed frame, ring frame, rotor and air-jet spinning machine on packing density parameters of respec...

Double-rotation (DOR) is the only technique generally capable of yielding high-resolution NMR spectra of half-integer quadrupolar nuclei in one dimension for solids without the need for sophisticated coherence pathway selection. Unfortunately, due to the low outer rotor spinning frequencies currently available, the spectra often contain a large number of spinning sidebands which may overlap wit...

In this study we investigated the possibility of increasing the visibility of helicopter rotor tips when viewed from the underside. In an experimental study we used a model of a rotor blade spinning at a fast enough rate that it appeared as a transparent disk. The tips of the blades were painted fluorescent red-orange, and were observed under three different lighting conditions. In one conditio...

Labour productivity has been continuously increasing since the days of spinningjenny to the modern day roto r frames. To visualize the spinning industry in the year 2000, the past and the present technologica l changes have been analyzed so as to assess their overall impact in terms of labour complement.. material handling, required operative skill and automation. The automation in textile indu...

Spinning up a Powerball – a hand-held gyroscopic toy or exerciser that exhibits rotor spin-up when applying appropriate torque to its casing – is a fairly easy task for a human but rather complex to perform with a robot. To accomplish the task of spinning up the rotor of the Powerball with a robot, we measured the motion of a human and identified the conditions an individual uses for a successf...

In this paper, using a personal computer (PC), the practical implementation of scalar and vector control methods on a three–phase rotor surface- type permanent magnet synchronous machine drive is discussed. Based on the machine dynamic equations and the above control strategies, two block diagrams are presented first for closed-loop speed controlling of the machine drive/system. Then, the desig...

In this paper, using a personal computer (PC), the practical implementation of scalar and vector control methods on a three–phase rotor surface- type permanent magnet synchronous machine drive is discussed. Based on the machine dynamic equations and the above control strategies, two block diagrams are presented first for closed-loop speed controlling of the machine drive/system. Then, the desig...