Fabrication of PDMS Dome-Shaped Membrane and its Performance Analysis Using FEA for Fluidic Based Flow Sensor

2014 ◽  
Vol 699 ◽  
pp. 289-294
Author(s):  
Mohd Norzaidi Mat Nawi ◽  
Asrulnizam Abd Manaf ◽  
Mohd Rizal Arshad ◽  
Othman Sidek
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Performance Analysis ◽  
Fluid Velocity ◽  
Fabrication Process ◽  
Flow Sensor ◽  
Input Flow ◽  
Element Analysis ◽  
Actual Shape ◽  
The Ideal

The dome-shaped membrane was designed for the fluidic based flow sensor for the underwater sensing. It has the diameter of 5mm and thickness within 0.2mm. The simple fabrication process for the dome shaped structure was demonstrated using casting and molding processes. The effect of the fabrication process was investigated by measuring the thickness of the dome-shaped membrane for different sample. For the performance analysis, the actual shape which was the same with the fabricated shaped was simulated and compared with the ideal shape using finite element analysis for the same input flow rate. The membrane sensitivity of the actual shape decreased from 163.4 μm/ms-1 to 133.33 μm/ms-1 compared to the ideal shape based on the displacement of the membrane over input fluid velocity.

Lateral Movement of Pipelines on a Soft Clay Seabed: Large Deformation Finite Element Analysis

2011 ◽  
Author(s):  
S. Chatterjee ◽  
D. J. White ◽  
M. F. Randolph
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Large Deformation ◽  
Soft Clay ◽  
Realistic Model ◽  
Element Analysis ◽  
Resistance Response ◽  
Soil Model ◽  
Lateral Resistance ◽  
The Ideal

Large deformation finite element analysis using the commercial software ABAQUS has been performed to study the lateral response of pipelines on a soft seabed. Initially, pipe soil interaction simulations are presented for the case of ideal soil, with non-softening strength. Lateral resistance profiles and trajectories of the pipe during lateral motion are investigated for different initial embedment of the pipe. A more realistic soil model incorporating the effects of strain rate and strain softening is then explored. Lateral resistance profiles and trajectories of the pipes from this realistic model are compared with the ideal soil case. Finally, the concept of effective pipe embedment — which accounts for the geometric changes caused by the soil berm ahead of the pipe — is applied to both the ideal and realistic soil model responses. The normalized horizontal resistance response is shown to be linked to the effective embedment in a simple manner, regardless of the other soil and pipeline parameters. This provides a useful contribution towards the development of a general model for describing large-amplitude lateral pipe-soil interaction, taking due account of the effects of changing geometry and soil strength.

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