Molecular Machinery: различия между версиями

===SRG-II Speed Reducer Gear===

The SRG-II is another parallel-shaft speed reducer gear created by Mark Sims. It was designed and modeled completely from scratch using NanoEngineer-1 (Alpha 6). The goal of the SRG-II was to create a robust nanoscale gear complete with a casing and extended connector shafts. As you can see, the SRG-II looks every bit like a speed reducer gear. Although the casing is a single component, its atoms have been grouped into sections and hidden in the animated sequence above so that you can better visualize the casing arrangement.

* Steps per Frame: 50.0 femtoseconds

* Temperature: 300K

As can be seen from this speed plot of the rotary motor attached to the pinion gear, the acceleration time was about 23 picoseconds. The duration of the simulation was 47 picoseconds.

With practice, an experienced user can create this bearing in 10-15 minutes. NanoEngineer-1 includes an extrusion tool for creating rods and rings from a molecular fragment (called a chunk in NanoEngineer-1).

The contraption with spokes connected to the inner shaft is called a [http://nanoengineer-1.net/mediawiki/index.php?title=Feature:Rotary_Motor Rotary Motor]. This is a type of jig in NanoEngineer-1 that applies torque to the atoms to which it is attached during a molecular dynamics simulation, driving the inner shaft. The rotary motor here had a torque setting of 1.0 nN-nm and a speed of 10 GHz. These values are extreme and were used to produce an interesting simulation as quickly as possible. A serious engineer assessing the operating conditions of this bearing would have used more reasonable numbers.