Instrumentation and Control of an MR Bypass Valve

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25 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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An ECE
Senior Design Project Description

Instrumentation and Control

of
an
MR
B
ypass Valve

Provided by


Dr. G. Song, Professor

Department of Mechanical Engineering

Tel: (713) 743
-
4525; Fax: (713) 743
-
4503; Email: gsong@uh.edu


Project Background

Valves
are critical components of control systems in the pr
oduction of offshore oil & gas. V
alve
actuation
in offshore oil & gas
is
controlled by traditional hydraulic methods.
In traditional
hydraulic control systems,
the
actuation of valves is delayed
due to

ve
ry
l
ong

hydraulic line
s
.
These long hydraulic lines

also

need to carry high pressure fluid at all times during

normal
operation. As a result

traditional

control

systems
cannot precisely control valves
.


As a solution to
the
ab
ove mentioned problems, use o
f
MagnetoR
heological (MR)

fluid to hold

and control the

load
during

valve

actuation

is

proposed. When
a
magnetic field is applied to
MR
fluid
s
,
the

yield shear stress

of the MR fluids

increase,

effectively
solidifying the
MR fluid
s

below

a

certain str
ess

level
. This

instantaneous

and controlled
change in rheological properties of
MR was the key concept used to develop MR valve
s
. A
n innovative
MR
bypass
valve was
designed and developed as
a
proof of concept by
a Mechanical Engineering (ME)
senior design
te
am (2012
-
13) at Sma
rt Materials and Structures Laboratory

at University of Houston. The
ME
senior design team

(2012
-
13)
and researchers

in Dr. Song’s research group
have successfully
developed a design

and built a prototype for demonstration.

However, this prototype does not
have any instrumentation nor feedback controls.


Figure
1

MR Bypass Valve Prototype

Problem Statement:

The prototype of the
MR bypass valve

that was built by the ME
senior design team
is

shown in
Figure 1. The electromagnets used
in the project
were not strong enough to generate a magnetic
field

strong enough to adequately solidify the

MR fluid
s
. As a result,
the
MR valve
was unable to

stop fluid flow above 150psi pressure difference. The

pressure readings were taken by using two
analog pressure gauges on the system and
the
electromagnets were powered
via a manually
controlled

DC power supply
, which reduced system

repeatability and accuracy in flow control.


Project Objective

In this proj
ect,
the design
team will develop a basic understanding of the functionality of MR
fluid
s

and their controls

methods
. They will be expected to understand the working principles of
MR fluid
s

and
the
design of MR bypass valve
s
. In first part of

the

project t
hey will have to
perform a thorough literature review about MR fluids

and
their
applications

in
oil & gas,
civil,
mechanical structures and different control strategies
used for
MR fluid systems.
The t
eam will
also
be tasked to perform

an extensive search to
design

better electromagnets to improve the
response of
of the
existing setup.

The main focus
of this project
will be on the instrumentation of the existing setup, and
implementation of different control strategies to control
the
M
R bypass valve.
The t
eam will also
perform a comparative study for different controllers.


Deliverable
s

1.

A brief literature review about MR fluids, their application in engineering and science,
and different control strategies
for

use

with

MR fluid systems.

2.

Design

better electromagnet
s
.

3.

Instrumentation of
the
MR bypass valve and implementation of different controllers

with
safety features
.

4.

A detailed report demonstrating knowledge of the fundamental of MR fluid and controls,
all results and possible
recommendations at end of the

semester.

5.

An autonomous system with instrumentation, controls, and
friendly
use
r

interface (touch
screen, buttons, .. ) for the MR valve. It is expected that an embedded system will be
used.



Faculty Sponsor:

Prof. Gangbing Song, x34525, email:
gsong@uh.edu


Dr. Michael Ho, x30370, email:
siuchun.ho@gmail.com



Graduate Assistant:


Mr. Dev Patil, x34549,

email:

deven1p@gmail.com