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Articles by M. Oehler
Effect of tooth root fillet design on plastic-gear tooth root stress
The geometry of plastic gears used today is usually based on conventional steel gears, which are bound to the restrictions of the machining production of gears. The injection molding process provides more design freedom here. In this work, simulative results in terms of tooth root stress in plastic gears with various tooth root fillet designs are shown.
A decomposition of the torsional stiffness of a worm gearbox into individual components
In worm-drive applications with precise transmission, the torsional stiffness of the worm gearbox is an important parameter for the positioning accuracy. Moreover, it influences the dynamic behavior of a worm gearbox. The torsional stiffness is a result of elasticities from all gearbox components along the load path. This leads to various options for an optimization of the torsional stiffness within the design process of a worm gearbox.
Transient friction and wear simulation of worm gears during running-in
Due to substantial sliding in tooth contact, friction losses are an issue in worm gears, but a simulation tool can be used to study the behavior between two interacting tribological measures – friction and wear – during the running-in of worm gears. The load capacity of worm gears strongly depends on the size of the contact pattern. Worm wheels are often manufactured by using an oversized hob, which results in a relatively small initial contact pattern.
Just Add Water: Why US Shale’s Next Big Supply-Chain Revolution Is Wet Sand
Sand is mined. It is washed. It is dried. Then it gets wet again. Such is the unassuming life cycle of most every grain of sand ever pumped down a horizontal well along with millions of gallons of water and into the freshly opened fractures of a tight-rock formation in the US. But what if the sand never had to be dried? To start with, the unconventional sector could save tens or hundreds of millions of dollars a year, simply by cutting out the capital-intensive drying process.
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