Lockstitch Tightening Model with Mechanical and Thermal Loads

Both physical and mathematical models of lockstitch tightening are determined. Te basic dynamical equation is a second-order diferential correlation with respect to time; the forces applied are analysed and defned. Te supplemented correlations are formulated by means of basic physical phenomena. Te total angle of contact on the mobile barriers of the disc is introduced by physical analysis of the take-up mechanism. Both mechanical and thermal elongation are determined within the thread and introduced into the basic dynamical equation. Te set of equations can be solved by means of any processing sofware (for example Mathematica) and the results obtained visualised for diferent parameters.