Optimisation of weft insertion on an air-jet weaving machine using computer simulation
Başlık çevirisi mevcut değil.
- Tez No: 400568
- Danışmanlar: DR. M. P. U. BANDARA
- Tez Türü: Doktora
- Konular: Tekstil ve Tekstil Mühendisliği, Textile and Textile Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1997
- Dil: İngilizce
- Üniversite: University of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Tekstil Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 229
Özet
Özet yok.
Özet (Çeviri)
It is almost surprising that a flexible yarn can be made to move in an air stream, without direct mechanical assistance , and be inserted as weft on a wide loom, at rates that far exceed the capability of the more conventional shuttleless processes. In fact the basic technique of air-jet weft insertion using a profiled reed and relay jets has been perfected to such an extent that air-jet weaving is taken for granted as a highly productive weaving process. The process by its nature is somewhat inefficient in its energy usage in comparison with the other shuttleless systems, on account of the need of compressed air for weft propulsion. Hence there is a strong necessity to optimise the air usage for a given weft yarn, without compromising the reliability of weft insertion. Due to the many parameters of importance in air-jet weft insertion, the optimisation is not a simple process. This research was intended to study the air consumption on a standard modern air-jet weaving machine, and arrive at a practicable method of optimising air demand. The air demand was measured through a number of experiments for various combinations of the main parameters that include the pressure levels applied to the main nozzle and the relay nozzle groups, and the timing of their operation. There are factors of secondary importance such as the weft package size and its placement with respect to. the main nozzle. It was necessary to study the weft insertion process theoretically for obvious reasons. Due to the discontinuous nature of air-jet operation, computer simulation is an ideal tool for studying the process. This was carried out successfully using a simplified model of the weft motion, but despite the simplicity, the results obtained compare quite well with actual measured values. One of the novelties of the simulation is that it was carried out using the EXCEL spreadsheet, which makes for great convenience in both the design of the simulation, by avoiding the rather cryptic approach afforded by traditional programming in a high level language. Running the package in the WINDOWS environment also enables the spreadsheet to be linked in real time to a graphics package, ORIGIN in this case, which brings about great utility to the simulation. It is convenient to be able to use the package as a tool in studying the insertion of different weft yarns. To this end the weft yarns were tested to obtain applicable yarn force coefficients for both the main nozzle and the relay jets. Since the measurement of the coefficient for relay nozzles is rather difficult an attempt was made to obtain a relationship between the two coefficients, and the results show that this is possible. It was necessary to develop a special tension probe to carry out this measurement, and this was done by utilising a piezo-electric force sensor to construct a suitable device, which served the purpose adequately. Finally, a procedure has been proposed by which to optimise the weft insertion using a given type of yarn.
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