Post on 03-Jan-2016
description
The Need
Measure The pressure by using Strain Gauge.. Hoop stress
Measure the pressure 1 -conversion of pressure into an electrical signal
2 -Find the resistance in the wire3-Find the stress from the strain gauge
4-By the stress and the resistance we can measure the pressure
DESIGN CONCEPTthe conversion of pressure into an electrical signal is achieved by the
physical Deformation of Strain Gages which are bonded into diagram of the pressure transducer and wired into a
Wheatstone bridge configurationPressure applied to the pressure transducer produces a deflection of
Diaphragm which introduces Strain to the gagesthe strain will produce an electrical resistance change proportional
to the pressure Strain-Gage Pressure Transducer is used for both static and dynamic
( Fluctuating) pressure Measurement
Calculations
Quarter-Bridge Circuit
Half-Bridge Circuit
Full-Bridge Circuit
DIMENSIONS (BLUEPRINT)
Materials (and Components)
Strain gages consist of a very fine and thin metallic foil etched in a grid pattern, which is bonded to a device
and used to measure the strain, or amount of deformation of the device when load or pressure is
applied. The resulting electrical output is proportional to the strain.
Because these strain gages are so small that they are negligible in mass, they excel in sensitivity, stability and fatigue with no inertial effect. They are also an easy-to-handle device, whose operating temperature range is
wide. The gages can be used to measure the strain of all kinds of materials, regardless of metal or plastic.
Manufacturing (and Assembly)
Cost EstimateStrain gauge YBB-350-4HA-B
Features:
It use Phenol resins as a backing material. They are employed with glass fibre reinforcement
in a lamination process. YBB series strain gauge has good heat resistance, low creep tendency,
low thermal hysteresis , long-term stability and other characteristics, Ideal for load cell
applications FOB Price: US $2 - 4 / Piece
Port: Guangzhou
Minimum Order Quantity:
5Pieces
voltmeterBatterywire
From the lab5$3$
Time ScheduleTime Work
Week Identify the need
Week Define the criteria (from the instructor)
4 days Research
6 days Generate alternative solutions
1 day Choose a solution
week Create a detailed design
week Modeling
2 days Testing and Evaluation
Pharos University in AlexandriaFaculty of Engineering
Engineering Perspectives LaboratoryFreshman Design Project:
Project Title________________ :Section____
Fall 2012/13
Name (Arabic) ID Grade
Methods of Testing and Evaluation
Trying to connect a voltmeter in a circle with the strain gauge and some resistance in addition ( to a battery ( making a simple and cheap circle to find the pressure using another method
And our try was successful .. We can measure the pressure