Abstract Burning surface calculation is an important item in solid rocket engine design. In order to accurately calculate the parameters such as burning change law combustion chamber, level set based method used for calculation, firstly, complex divided into a uniform grid by voxelization; then distance transformation signed function, and finally information of contour obtained generate curve. ...

This contribution describes a computational model of the solid-state variable-frequency induction motor drive. The model of the induction motor has been represented as a system of differential equations for flux linkages and angular velocity. These equations have been represented in Cartesian coordinate system, the use of which decreased their number to 7 instead of 10 equations and restricted ...

the main purpose of this study was to determine which correlate, perceived motor competence or motor skill competence, best predicts girls' physical activity behavior.a sample of 352 girls (mean age=8.7, sd=0.3 yr) participated in this study. to assess motor skill competence and perceived motor competence, each child completed the test of gross motor development-2 and physical ability sub-scale...

Solid rocket motor flows depend strongly on alumina granulometry, which spreads up with coalescence. Solving droplet sizes in unsteady flows is a modeling and numerical challenge, specially when high loadings generate retrocoupling. As an alternative to Lagrangian approaches, the Eulerian Multi-Fluid model describes polydispersity with size-sorted droplet fluids called sections. A two size mome...