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Lecturer(s)
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Dvořák Josef, doc. Ing. CSc.
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Bílek Martin, doc. Ing. Ph.D.
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Kovář Šimon, Ing. Ph.D.
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Course content
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Courses: 1. - 2. Weaving cycle and process, periodic and continuous processes, single-phase and multi-phase systems, relationships of machine performance and frequency, the main phases of weaving cycle. 3. - 4. Shedding mechanism, excitation of elastic forces in the warp, displacement laws and types of mechanisms. 5. - 6. Beating-up mechanism, excitation of forces in the warp threads with the loom reed, static model of beating-up force and weaving resistance. 7. - 8. Weft insertion (picking) systems of weaving machines - mechanical systems ( shuttle, rapier, projectile), equations of motion of each phase of picking, speed determination of weft carrier and weft, determination of forces in the weft 9. - 10. Jet picking systems (hydraulic and pneumatic), elementary motion equations of weft insertion, speed determination of weft carrier and weft, determination of forces in the weft 11. - 12. Compensation of undesirable forces during the weaving cycle, back rest equivalent diagram, static and dynamic model of back rest. 13. -14. External regulation means of weaving process, identification of regulation system, controlled and actuating quantities, basic equations of regulation, central member ( PID controller). Modeling of beating-up process, beating-up pulse, weft slippage, balance of elastic and adhesion forces, impact and pressing effects Seminars: 1. Security of work. 2. Demonstration of beat up and shedding mechanisms. 3. Demonstration of weft inserting mechanism. 4. Demonstration of let-off motion and take-up motion. 5. Measuring of tension force in warp. 6. Data computing and discus of results. 7. Measuring of tension force in the warp and fabric. 8. Data computing and discus of results. 9. Influence of clamping length of warp thread on module of elasticity. 10. Data computing and discus of results, rheological properties of textile material. 11. Measuring of tension force in the weft. 12. Data computing and discus of results. 13. Consultation. 14. Credit.
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Dialogue metods(conversation,discussion,brainstorming), Demonstration, Project teaching
- Class attendance
- 56 hours per semester
- Semestral paper
- 30 hours per semester
- Home preparation for classes
- 28 hours per semester
- Preparation for exam
- 40 hours per semester
- Presentation preparation (report)
- 5 hours per semester
- Preparation for laboratory testing; outcome analysis
- 14 hours per semester
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Learning outcomes
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Within the subject, those issues are dealt with: fabric formation, thread displacements and deformations in the binding element; kinematic excitation of forces in the threads by means of movements of mechanism working links forming the fabric; forces in the warp and weft effectively used for fabric forming, control of those forces on the weaving machine; elimination of undesirable forces with compensators and controllers (regulators); beating-up process modeling; forming and using the beat-up discrete models; weft insertion (picking) systems, equations of motion, weft speed and forces determination; composition of the units of weaving machine in response to the variability of weaving process.
Deepening the knowledge in the field of weaving, namely: fabric formation, displacements and deformations of threads in the binding element; forces in the warp and weft effectively used for the fabric formation; weft insertion (picking) systems and their equations of motion; determining the speed of weft carrier and weft, determining the forces in the weft ; composition of weaving machine units in response to the changes of weaving process; weaving machine automation.
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Prerequisites
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Knowledge of the technological process of weaving, knowledge of the function of weaving machine, Mechanics: statics (equilibrium equation of forces) -kinematics ( kinematic quantities of general movement, structure of simple planar mechanisms, displacement laws, transfer functions) - dynamics ( equations of motion) ,- elasticity and strength ( relation of forces and deformations (strain) , tension, bending) Mathematics : differential equations ( of the 1st and 2nd order)
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Assessment methods and criteria
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Combined examination, Student's performance analysis
Credit: Participation in laboratory exercises. Preparation and defense of seminary works from the subject. Exam: written + oral
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Recommended literature
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informační server ITMA + Tkaní.CZ.
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Bowden F.P, Tabor D. Friction and Lubrication of Solids. Proc. RoySoc., A169, 391, Clar. Press, Oxford.
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DVOŘÁK, J. Tkací proces a stroj, TU-Liberec, 2006.
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MASAJTIS, J. Dynamic disturbances of warp tension in weaving and behaviour of the letoff motion on the loom.. University of Gent, 1998. ISBN 83-908012-3-X.
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Nosek S. Teorie tkaní čast II, Dům techniky Pardubice, 1988..
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Nosek S. Teorie tkaní I, Dům techniky, Pardubice, 1988..
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Ormerod A., Sondhelm W.S. Weaving - Technology and Operations, The Textilie Institute,. Manchester, UK, 1995. ISBN 187081276X.
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