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Numerical modelling of the opening process of the three-coating aortic valve

Kopernik M., Nowak J.

Archives of Mechanics

2009

Vol. 61, nr 3-4

171-193

Numerical modelling of the three-coating human aortic valve is the objective of the paper. The proposed approach is used to select the material properties and the thickness of outer coating of the valve, which are required to obtain the proper work of the valve, which in the present paper is considered as the opening process. Following the previously developed model of the monocoating lea?et of the natural human aortic valve, the model of three-coating valve is prepared. Finite element method (FEM) and sensitivity analysis are used to solve the formulated and selected problems. Two methods of estimation of the valve opening process in numerical models are elaborated on the basis of experimental studies.

New technique for optimising yarn-end preparation on splicer, and a method for rating the quality of yarn-end

Issa K., Grütz R.

Autex Research Journal

2005

Vol. 5, no. 1

1--19

This paper presents a method for improving the yarn-end preparation on a splicer by forming a loop outside the opening tube which assures gentle delivery of the yarn to the opening tube, as well as control of the yarn-end length which will be prepared. Twelve groups of yarns were selected and tested using the new technique and a standard splicer. The new technique for yarn-end preparation showed better results in comparison to the standard splicer, especially for high twisted and plied yarn.