Based on the principles of equalized sliding coefficients and equalized teeth bending strength, the optimization mathematical model for calculating and allocating the addendum modification coefficients of involute cylindrical gear is firstly established. Then the measures to calculate the tooth parameters in real-time during the optimization steps are achieved. Finally, the optimization program...

In order to enhance the load capacity of gears, researchers take notice in the asymmetric tooth gears. Asymmetric gear which has higher pressure angle of back tooth aiming to improve banding strength has been analyzed (Deng, et al., 2003). Brown et al. (Brown, et al., 2010) investigate the asymmetric tooth from both point of view of bending and scuffing. Kruger et al. (Kruger et al., 2013) anal...

In order to derive the equation of the contact line of the involute curvilinear-tooth cylindrical gear pump for the agricultural tractor, the tooth surface of the involute curvilinear-tooth cylindrical gear is firstly generated as that of the spur or helical gear. Then the equation of the tooth surface is derived from changing the settings and orientations of the coordinate systems after the eq...

Generating-line method, which is based on the generating process of spherical involute curve, is a new processing theory of cutting ideal spherical involute gears. Based on the principle of the new method, this paper expands the traditional geometrical relationship into the cutting geometry of generating-line method, and proposes the base-cone parameters with their formulas to provide necessary...

Hemangioma is a benign vascular abnormality characterized by rapid growth of endothelial cells. It arises during first 8 weeks of life, rapidly proliferates during 6 12 months of life and gradually involutes by 9 12 years. Hemangiomas occur more in females with male to female ratio being 1:3 to 1:5. Almost 80 to 90% of hemangiomas involute completely by the age of 9 years. The remaining 10 20% ...

This paper explores theoretically the possibility of using caustics, formed in the ultrasonic field diffracted by defects, as an approach to the inverse scattering problem, The case of crack-like defects is considered in detail, using the geometrical theory of diffraction. The involute of the far field caustic reproduces the projection of the crack edge in the incident beam direction, for a pla...

Facial hemangiomas are benign vascular neoplasms of infancy and childhood. Although most hemangiomas do not result in significant complications, some result in pain, ulceration, infection, and structural abnormalities and can interfere with respiration, vision, and hearing. A 5-month-old infant presented to the author's wound center with a necrotic wound within a large, segmental hemangioma of ...