A computational model of a planetary gear set is employed to study the influence of surface wear on the dynamic behavior of a typical planetary gear set. The overall computational scheme combines a wear model that defines geometric description of contacting gear tooth surfaces having wear and a deformable-body dynamic model of a planetary gear set. The wear model employs a quasi-static gear con...

The International Organization for Standardization (ISO) provides a method by which different spur and helical gear designs can be compared in terms of the risk for surface fatigue. The calculation of surface durability is based on Hertzian contact theory modified by factors for making adjustments peculiar to gearing. These factors are mainly determined through experimentation, and include surf...

background: one of the most widely used equipments in harvesting hay and grains are four wheel mowers. the aim of the present study was to determine the levels of noise exposure in drivers and bystanders in different states, speeds and gear of four wheel mowers (bcs model 622).   methods: the iso 5131 and iso 6814 standards were used to assess noise exposure in drivers and bystanders, respectiv...

Agunmukha River is an important water body having plentiful aquatic resources. The fisheries communities in the river are familiar with a diverse range of fishing gear and crafts to catch fish. Therefore, the objectives of the present study were to explore fishing gear and fishing crafts, catch composition of the respective gearand identification of fish biodiversity of Agunmukha River. A step ...

Global competitive business market had brought increasing awareness to optimize the gear design. Gears have the advantage over friction and belt drives in that they are positive drive, a feature which most of the machine tools require, since exact speed ratios are essential. The design and manufacture of precision cut gears, made from materials of high strength, have made it possible to produce...

Vibration generated by a gear-set is a signal of its technical condition. Many papers have been published on relation between the vibration signal and the condition of a gear-set. It is convenient to investigate this relation by dividing the factors which have influence on vibration generated by a gear-set into four major groups: design, production technology, operational and change of conditio...

Since there are backlash friction and time-varying stiffness, the characteristics of gear pair has strong nonlinearity. When a gear has faults such as pitting, spalling and tooth breakage, there are often some nonlinear characteristics as super-harmonics or sub-harmonics along with vibration signal. These characteristics will cause some difficulty for fault diagnostics, so it is necessary to st...

Original scientific paper The relationships between the existence of gear teeth cracks as a cause and symptoms emerging as housing vibrations that can be detected with signals measured was investigated numerically and experimentally. Experimental measurements on one-stage gear drives have been carried out involving gears built in with different notch length in tooth root. Signals measured as ac...

BACKGROUND In-line skate injuries are highly preventable by the use of protective gear. We investigated how young Dutch skaters protect themselves and what factors predict the use of protective gear in order to develop campaigns to increase their safety behaviour. METHODS A survey was conducted to study protection behaviour of 872 Dutch skaters and factors influencing the use of protective ge...

− Evaluation of measurement performance of a gear measuring instrument (GMI) is not easy task since a master gear with sufficient accuracy has not been available. The manufacturing the master gear with an ideal involute form is very difficult and the accuracy of the master gear is not able to be estimated. Therefore, we have proposed a new artifact named Double Ball Artifact (DBA) which consist...