Finite-element analysis of a constant-force solenoid for fluid flow control

1988 ◽  
Vol 24 (4) ◽  
pp. 574-581 ◽  
Author(s):  
B.P. Lequesne
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fluid Flow ◽  
Flow Control ◽  
Constant Force ◽  
Element Analysis ◽  
Fluid Flow Control

Finite element analysis-based design of a fluid-flow control nano-valve

2005 ◽  
Vol 117 (1) ◽  
pp. 53-61 ◽  
Author(s):  
M. Grujicic ◽  
G. Cao ◽  
B. Pandurangan ◽  
W.N. Roy
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fluid Flow ◽  
Flow Control ◽  
Element Analysis ◽  
Fluid Flow Control

Design of a Single-Acting Constant-Force Actuator Based on Dielectric Elastomers

2008 ◽  
Author(s):  
Giovanni Berselli ◽  
Rocco Vertechy ◽  
Gabriele Vassura ◽  
Vincenzo Parenti Castelli
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Compliant Mechanism ◽  
Structural Parameters ◽  
Dielectric Elastomer ◽  
Constant Force ◽  
Element Analysis ◽  
Body Model ◽  
Rigid Body Model ◽  
Supporting Frame

The interest in actuators based on dielectric elastomer films as a promising technology in robotic and mechatronic applications is increasing. The overall actuator performances are influenced by the design of both the active film and the film supporting frame. This paper presents a single-acting actuator which is capable of supplying a constant force over a given range of motion. The actuator is obtained by coupling a rectangular film of silicone dielectric elastomer with a monolithic frame designed to suitably modify the force generated by the dielectric elastomer film. The frame is a fully compliant mechanism whose main structural parameters are calculated using a pseudo-rigid-body model and then verified by finite element analysis. Simulations show promising performance of the proposed actuator.

Evaluation of Vibration Characteristics for Reactor Coolant Pump Considering Fluid Flow Effect

2014 ◽  
Author(s):  
Ik Joong Kim ◽  
Min Chul Kim ◽  
Gyu Ho Jang ◽  
Dae Hee Jeong ◽  
Oak Sug Kim ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fluid Flow ◽  
Response Spectrum ◽  
Vibration Characteristics ◽  
Working Fluid ◽  
Element Analysis ◽  
Coolant Pump ◽  
Flow Effect ◽  
Unbalance Response

Reactor coolant pump (RCP) is designed for the heat transfer of heat which is generated from reactor vessel to steam generators by circulating the coolant water. RCP is the only rotating equipment in the nuclear steam supply system (NSSS). Therefore, the problem of vibration has arisen caused by the hydraulic forces of the working fluid. These forces can drastically alter the critical speeds and stability characteristics and can act as significant destabilizing forces. So, vibration evaluation of RCP has been considered as a very important issue [1]. Among them, unbalance response caused by weight of unbalancing of rotating shaft could have serious effects on the entire rotor system. Thus, precise unbalance response spectrum analyses are required. In general, in order to evaluate the unbalance response characteristics for centrifugal pump, finite element analysis was performed according to the ISO 1940-1 standard. However, finite element analysis according to the ISO 1940-1 standard does not considering fluid flow effect. So, finite element analysis result and experimental results may be some differences. Vibration characteristics of RCP has affected by fluid flow effect induced from working fluid. Therefore, in order to understand vibration characteristics for the RCP shaft assembly considered in actual operating condition, rotor dynamic analysis should be performed considering the fluid flow effect. In this research, owing to accurately evaluate the vibration characteristics for the RCP considering hydro forces due to the fluid flow, we measured the bearing force and moment take into account the fluid-induced force. And then response spectrum analysis of RCP shaft assembly was performed considering fluid induced bearing radial forces which are measured values. Lastly, evaluate the vibration characteristics considering effect of fluid flow according to the number of revolution.

Magnetically Induced Vibration in an 8-Pole, 9-Slot Brushless DC Motor

1995 ◽  
Author(s):  
Thomas Y. Chuang ◽  
Dennis K. Lieu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Parametric Study ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Constant Force ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Brushless Dc ◽  
Maxwell Stresses

Abstract A parametric study was conducted to determine the effect of motor geometry on the force imbalance in an 8-pole/9-slot motor. The study is based on a quasi-static finite element analysis in which the force calculations were made by integrating the Maxwell stresses along the center of the airgap. For small variations from the base motor geometry, the study revealed the following trends. The magnitude of the force imbalance decreases as the slot width decreases. The imbalance also decreases as the airgap length increases. A rotor/stator eccentricity introduces a constant force imbalance which increases proportionally to, and in the direction of, the eccentricity. As the size of the motor is scaled up uniformly, the mass increases faster than the imbalance. The results suggest that the force imbalance is caused predominantly by the stress concentrations at the corners of the stator teeth.

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