Gearboxes sustain a variety of faults such as broken-shafts, eroded, broken, or missing teeth, and even broken-cases. Casing mounted accelerometers can detect fault patterns but the signals are complicated and difficult to interpret. This study considers the tooth loading of ideal gears and gears with defects. A large industrial gearbox used in a 12m electric mining shovel is modeled. The nonli...

This paper presents results of experimental research on the acoustic properties of gear wheels with high-profile teeth with differentiated tooth height. Those results showed that gear transmissions with high-profile teeth have the best acoustic properties, with the value of the transverse contact ratio εα ≈ 2.0. They also showed that a reduction in tooth height, and thereby in contact ratio, in...

A new Dipterus−like lungfish, Harajicadipterus youngi, is described from the Givetian (Middle Devonian) Harajica Sand− stone Member of central Australia. The material is comprised of five specimens representing the skull roof, orbital bones, tooth plates, operculo−gular bones, a partial pectoral girdle, centra and scales. Harajicadipterus can be distinguished from other dipnoans by its long pos...

An analysis of static occlusion including occlusal force and occlusal contact area in intercuspal position may be helpful but a dynamic analysis of occlusion should be regarded as more important for analyzing the stomatognathic system. Anthropological research has shown that the Japanese and the Mongolian populations share morphological and genetic similarities, although their dietary lives are...

Introduction:Temporomandibular disorders (TMDs) are referred to signs and symptoms involving masti‌catory muscles, temporomandibular joint and rele‌vant structures. Having been prevalent noticeably, we decided to evaluate the frequency of TMD, among patients referred to the dental clinic of Guilan university of medical sciences. Materials and Methods: In this cross-sectional study, a sample of ...

Gear contact surface wear is one of the important failure modes in gear systems. The procedure implemented in this work includes finite element multi pair contact modeling to predict the load sharing between the simultaneously contacting pairs and mathematical programming method to estimate the gear surface wear in high contact ratio gear drives for particular number of cycles. A method to find...