scholarly journals Effect of material on hydro-elastic behaviour of marine propeller by using BEM-FEM hybrid software

2013 ◽  
Vol 20 (4) ◽  
pp. 62-70 ◽  
Author(s):  
Hassan Ghassemi ◽  
Morteza Ghassabzadeh ◽  
Maryam Gh. Saryazdi
Keyword(s):  
Finite Element ◽  
Boundary Element ◽  
Finite Element Methods ◽  
Iterative Procedure ◽  
Elastic Behaviour ◽  
Hydrodynamic Characteristics ◽  
Inertial Forces ◽  
Marine Propeller ◽  
Light Material ◽  
Propeller Geometry

ABSTRACT This paper studies the effect of material on the hydro-elastic behaviour. The geometry of flexible propeller changes due to hydrodynamic and inertial forces acting on the propeller. By using prepared software (called HYDRO-BEM and ELASTIC-FEM) the hydro-elastic features of the propeller made of various materials are analyzed. In the software the hybrid boundary element and finite element methods are used. First, the load acting on the propeller is determined by using the BEM and deformed propeller geometry is then obtained by the FEM. In the next step, the load on the deformed propeller is determined by the BEM and a new shape is obtained. The iterative procedure is repeated till the blade deflection and hydrodynamic characteristics (thrust, torque and efficiency) of the propeller become converged. Four different materials are examined. It is concluded that the hydro-elastic behaviour of the composite propeller is strongly affected by its flexibility due to light material.

Power Train NVH Analysis With Excite in a Four Cylinder Inline Engine by Including Crankshaft Dynamics and Flywheel Swirl

2010 ◽  
Author(s):  
E. Tolga Duran ◽  
Dirk Braumueller
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Inertial Forces ◽  
Vibration Level ◽  
Power Train ◽  
Body Dynamics ◽  
Engine Mount ◽  
Noise Vibration ◽  
Multi Body

Engine mount vibration level, which is mainly driven by gas and unbalanced inertial forces, is one of the key metrics for the NVH (Noise Vibration Harshness) performance of a vehicle. In addition to gas and unbalanced inertial forces, crankshaft dynamics has also effect on engine mount vibrations. This project is concentrating in including the effect of crankshaft dynamics on engine mount vibrations with the aid of Finite Element Methods and Multi Body Dynamics. Flywheel swirl mode, its effect on engine mount vibration levels and engine mount acceleration for different flywheel configurations will be simulated.

scholarly journals Analysis of electric field control methods for foil coils in high-voltage linear actuators

2015 ◽  
Vol 64 (4) ◽  
pp. 629-640 ◽  
Author(s):  
T.A. van Beek ◽  
J.W. Jansen ◽  
E.A. Lomonova
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
Boundary Element ◽  
High Voltage ◽  
Finite Element Methods ◽  
Control Methods ◽  
Electric Stress ◽  
Field Control ◽  
Linear Actuators

Abstract This paper describes multiple electric field control methods for foil coils in high-voltage coreless linear actuators and their sensitivity to misalignment. The investigated field control methods consist of resistive, refractive, capacitive and geometrical solutions for mitigating electric stress at edges and corners of foil coils. These field control methods are evaluated using 2-D boundary element and finite element methods. A comparison is presented between the field control methods and their ability to mitigate electric stress in coreless linear actuators. Furthermore, the sensitivity to misalignment of the field control methods is investigated.

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