Comparative modelling of single piles and pile groups with finite elements and an analytical calculation method

2006 ◽  
Author(s):  
H Kempfert ◽  
M Rudolf
Keyword(s):  
Finite Elements ◽  
Calculation Method ◽  
Analytical Calculation ◽  
Pile Groups ◽  
Comparative Modelling ◽  
Single Piles

Analytical Calculation of Slotless Permanent Magnet Motor Based on Soft Ferrite

2013 ◽  
Vol 397-400 ◽  
pp. 501-504
Author(s):  
Xin Yi Zhang ◽  
Xing Hua Wang ◽  
Ming Hui Li ◽  
Xue Qin Zhang
Keyword(s):  
Finite Elements ◽  
Permanent Magnet ◽  
High Speed ◽  
Analytical Calculation ◽  
Air Gap ◽  
Permanent Magnet Motor ◽  
Leakage Flux ◽  
Brushless Motor ◽  
Prototype Test ◽  
Soft Ferrite

High-speed slotless permanent magnet brushless motor based on soft ferrite adopts a large effective air gap structure. For the large effective air-gap, the air-gap flux distribution becomes uneven and the end leakage flux significantly increases. Thus, the traditional analytical method of the phase EMF is inapplicable. This paper deduces the analytical expression of the phase EMF based on the analytical calculation of the air-gap field and analyzes the distribution of the end leakage flux by 3D finite elements methods. Then the end leakage flux is considered by a correction factor of the core length. Finally the analytical calculation method is proved to be feasible by the comparison between the finite elements results and the prototype test results.

Account for Metal to Metal Contact Between Gasket Centering Ring and Flange Facing in Calculation Using the XP CEN\TS 1591-3 Method: Comparison With Other Analytical Method and Finite Element Analysis

2014 ◽  
Author(s):  
Hubert Lejeune ◽  
Yann Ton That
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Calculation Method ◽  
Analytical Calculation ◽  
Technical Specification ◽  
Method Comparison ◽  
Metal Contact ◽  
European Standard ◽  
Element Analysis ◽  
Bolted Flange

The european standard EN1591-1 [1], initially published in 2001, defines a calculation method for bolted gasketed circular flanges, alternative to the TAYLOR-FORGE method, used as the basic method in most codes. In 2007, a new part, XP CEN/TS 1591-3 [2], has been added to the EN1591 series. This technical specification enables to take into account the Metal to Metal Contact (MMC), appearing inside the bolt circle on some assemblies. Due to a lack of industrial feedback and detailed validation, this document has not been raised to the standard status. In that context, under the request of its Pressure Vessel and Piping commission, CETIM has performed a study comparing this calculation method to Finite Element Analysis (FEA) on several industrial configurations. After a description of the XP CEN/TS 1591-3 calculation method, the major results obtained for spiral wound gasketed joints where MMC appears between centering ring and flange facing are presented and compared with FEA results. Moreover, results obtained with other classical analytical calculation methods as TAYLOR FORGE and EN1591-1 on the same Bolted Flange Connections (BFC) configuration are also analysed and compared to XP CEN/TS 1591-3 results.

Sign in / Sign up

Export Citation Format

Share Document