منابع مشابه
Rolling active control for an aircraft of seamless aeroelastic wing
This paper presents an investigation into the controllability for an aircraft of seamless aeroelastic wing. The research is aimed at the design of control laws for the aircraft rolling by actively operating a pair of an unconventional hingeless flexible leading and trailing control surfaces at different flight speed. The main challenge is how to achieve a specified rolling rate for the aircraft...
متن کاملUnzipped and Defective Nanotubes: Rolling up Graphene and Unrolling Tubes
The properties of carbon nanotubes can be dramatically altered by the presence of defects. In this work we address the properties of two different kinds of defective nanotubes: junctions of achiral tubes with topological defects and partially unzipped carbon nanotubes. In particular, we begin by focussing on the interface states in carbon nanotube junctions between achiral tubes. We show that t...
متن کاملDetermination of the Optimal Reduction Ratio for Least Springback during Cold Drawing of Seamless Tubes
Cold drawing process is one of the most used metals forming processes in industries for forming seamless tubes. This process of plastic deformation of metals occurs below the recrystallization temperature and is generally performed at room temperature. When metal is cold worked, upon the release of forming force, the springback occurs. In this paper, the springback effect of the seamless tube t...
متن کاملA case of rule-based heuristics for scheduling hot rolling seamless steel tube production
A production scheduling problem for hot rolling seamless steel tube at Tianjin Pipe Corporation of China is studied. Considering the complexity of the problem and the acceptable time for solving it, a rule-based heuristic approach is proposed and implemented. The proposed approach is a bottleneck scheduling method and considers simultaneously all production processes in three production units a...
متن کاملOnline Eccentricity Monitoring of Seamless Tubes in Cross-Roll Piercing Mill
Wall-thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot piercing stage but only inspect the quality of finished tubes using ultrasonic testing (UT) at the end of all manufacturing processes...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1888
ISSN: 0036-8733
DOI: 10.1038/scientificamerican11101888-10720supp