In-line skating injuries and protective gear use were explored in a sample of college students (n = 217). A minority of respondents wore protective gear. One third of skaters had experienced at least one minor injury, and a smaller percentage had experienced fractures or head injuries. Most minor injuries occurred during the first 1-2 times skating, while more serious injuries tended to occur a...

Landing gear is one of the critical subsystems of an aircraft. The need to design landing gear with minimum weight, minimum volume, high performance, improved life, and reduced life cycle cost have posed many challenges to landing gear designers and practitioners. Further, it is essential to reduce the landing gear design and development cycle time while meeting all the regulatory and safety re...

The aim of this study is to evaluate the effect of super finishing on gear acceleration and noise level. Many researchers [1-13] have studied the gear dynamic models to study the effect of various parameters on gear dynamics. A 6DOF model is developed and experimental studies were conducted. In this study, the effects of super finishing [14, 15] on gear acceleration and noise level were evaluat...

The paper proposes a method of cutting by generating spur gears using rack cutter with modified geometry. analytical equations the tooth profile rack-gear are deduced, both for involute zone and filleting region, based on remark that is envelope successive positions tool. undercutting radius obtained from system transcendental which requires numerical solving it. Compared to standard profile, d...

the new device made in this study could calculate the proper position of tillage tools relative to the land surface at each point, and hydraulic operator set its optimum position. the optimum position of tools is calculated by depth control software developed for this device, and its input data were depth for root development. the performance of device was tested on subsoiler for precision till...

Comparing with fixed shaft gearbox, vibration properties of planetary gearbox are much more complicated. In a planetary gearbox, there are multiple vibration sources as several pairs of sun-planet gears and several pairs of ringplanet gears mesh simultaneously. In addition, the signal transmission path changes due to the rotation of the carrier. To facilitate fault detection of a planetary gear...

  This study aimed to design a bycatch reduction device (BRD) for shrimp beam trawl, which is manufactured by flexible materials to reduce bycatch for the gear in the South Sea of Korea. The model test was carried out to understand the shape of the gear in the water and to measure the variation of flow speed due to the BRD in a circulating water channel. Catches were compared between a shrimp b...

In recent years a clear trend has developed in the aerospace industry towards the procurement of integrated systems from major suppliers (ref. 1). In this process, Messier-Dowty became a provider of integrated landing gear systems who is responsible for supplying a certifiable landing gear system and providing all the system level performance analysis. The aircraft landing gear system retractio...

Planetary Gear Trains are extensively used for the power transmission. Large reduction in a small volume is possible with planetary gear trains. High efficiency – 95% per stage is common in planetary gear trains. For the automation of car parking systems helical gear box is used. But requirements of the gear box of these kind shall be compact in size and should have high efficiency. For these r...