China
Africa
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Drones at work and play
Published in Henry H. Perritt, Eliot O. Sprague, Domesticating Drones, 2016
Henry H. Perritt, Eliot O. Sprague
The technology development required and the regulatory regime must be much more sophisticated than anything available now. Automatic systems for landing immediately, returning to home, and keeping out of certain airspace must be sophisticated, flexible, and completely reliable, because the microdrones will operate in densely populated residential and commercial areas, with many people abroad. Obstacles abound, such as utility poles and wires, trees, and buildings of various sizes and shapes. Chapter 3 describes NAMID, the kind of low-level airspace management system that would be appropriate. Such a regulatory regime must be built from the ground up around the technologies that will permit mission accomplishment while protecting safety in some of the most difficult environments that can be flown by drones.
Belt Conveyors
Published in Muhammad E. Fayed, Thomas S. Skocir, Mechanical Conveyors, 2018
Muhammad E. Fayed, Thomas S. Skocir
Obstacles to contend with may be in the form of machinery, buildings, other conveyors, roads, railways, rivers, canyons, or even public areas. The conveyor designers’ options are to go around the obstacle or to go over or under it. Going around the obstacle will entail breaking up the system into two or more separate conveyors. Each flight will require a separate driving system and will add a transfer point. This will increase the cost and maintenance requirements. It will also decrease the overall reliability of the system. This may be the only option available. If the situation permits, the conveyor can incorporate concave or convex vertical curves to go over or under the obstacle.
Study of a chassis path planning algorithm for a forest harvester
Published in International Journal of Forest Engineering, 2023
Zhuoxian Tan, Jinhao Liu, Biao Sun, Haoxian Qin, Yuewei Ma
The obstacle environment is an important part of harvester path planning. It is necessary to digitize the obstacle location and size information into the digital environment map. The forest environment mainly includes two types of obstacles (Figure 3). One is surface obstacles, including trees, surface rocks, etc. In addition, there are some obstacles created by human factors, such as tree roots, fallen trees, graves, etc. after logging; The terrain obstacles mainly include dangerous climbing terrain, dangerous gully terrain, etc.