Radial Shaft Seals in Arctic Conditions

1994 ◽  
Author(s):  
Jaakko Välttilä
Keyword(s):  
Arctic Conditions ◽  
Shaft Seals

Design and Operation of a Device for Evaluating Shaft Seals in Dynamic Applications

2003 ◽  
Author(s):  
James E. Johnson ◽  
Edwin A. Frame ◽  
Clifford A. Moses
Keyword(s):  
Shaft Seals

Some observations on rock weathering, Cumberland Peninsula, Baffin Island

1979 ◽  
Vol 16 (5) ◽  
pp. 977-983 ◽  
Author(s):  
Stephen H. Waits
Keyword(s):  
Salt Crystallization ◽  
Rock Weathering ◽  
Baffin Island ◽  
Significant Modification ◽  
Bedrock Weathering ◽  
Arctic Conditions ◽  
Selective Preservation ◽  
Mechanical Weathering ◽  
High Level

A variety of bedrock weathering features—both modern and remnant—including surface grus, polygonal cracks, siliceous glaze, tors, weathering pits, and tafoni typify upland outcrops on the Cumberland Peninsula. Tor ridges are particularly prevalent and at lower elevations they show significant modification and streamlining by flowing ice. On summit areas at elevations above 750 m, however, remnant corestones are preserved in situ, suggesting selective preservation of upland surfaces. Bedrock structure and composition, topographic position, and intensity of process strongly influence tor development. Weathering pits are common on high level, open summit surfaces where weathering occurs in response to both climate and continued removal of derived debris. Pit enlargement through lateral undercutting has been favoured by accumulation of protective bottom residua, mechanical weathering, and the presence of exfoliation crusts. It is postulated that salt crystallization plays a role in outcrop microweathering under present upland arctic conditions.

Current Design Rules for Welding of Wind Energy Structures for Arctic Conditions

2019 ◽  
Vol 822 ◽  
pp. 452-458
Author(s):  
Sergey Lopaev ◽  
Pavel Layus ◽  
Paul Kah ◽  
Sergey Parshin
Keyword(s):  
Wind Energy ◽  
Structural Integrity ◽  
Structural Characteristics ◽  
Welding Process ◽  
Climatic Conditions ◽  
Welding Parameters ◽  
Reliable Operation ◽  
Arctic Conditions ◽  
Current Design ◽  
Standards And Guidelines

An article presents a review of current standards and guidelines in the field welding fabrication requirements for wind energy structures in arctic conditions. Extreme climatic conditions, such as Arctic, have a strong influence on the requirements for wind turbines structural characteristics, materials and fabrication methods. Special attention has to be paid for selecting steels with suitable mechanical properties, processing methods and delivery conditions. Additionally, it is highly important to select proper welding process and welding parameters, so that the structural integrity and reliable operation can be achieved.

Integrierte Berechnung des dynamischen Betriebsverhaltens von Radialwellendichtringen/Integrated Calculation of the Dynamic Operation Behavior of Radial Shaft Seals

Konstruktion ◽  
2015 ◽  
Vol 67 (11-12) ◽  
pp. 80-84
Author(s):  
Barbara Jennewein ◽  
Bernd Sauer
Keyword(s):  
Dynamic Operation ◽  
Shaft Seals

Inhalt: Das instationäre Betriebsverhalten eines Radialwellen-dichtrings (RWDR) über der Einsatzzeit kann erstmals berechnet werden. Ermöglicht wird dies durch einen integrierten Berechnungsansatz, der die Wechselwirkungen von den Elastomereigenschaften, von Reibungs-, Verschleiß- sowie Temperaturverhalten und von dynamischer Wellenauslenkung in radialer Richtung berücksichtigt. Im Rahmen der Forschungsarbeit wurde eine Strategie zur experimentellen Ermittlung der Eingangsparameter aufgezeigt und für eine exemplarische Reibpaarung aus RWDR, Schmierstoff und Gegenlauffläche durchgeführt. Anhand einer experimentellen Validierung wurde gezeigt, dass die Berechnung gut die Ergebnisse aus Prüfstandsversuchen trifft.

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