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Laboratory Exercise - Modal Test
on the Jim Beam:
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Data Physics Multi-Channel Data Acquisition with
the Abacus System
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PCB Piezotronics Impact Hammer
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PCB Piezotronics Mini Tri-Axial Accelerometer
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ME'Scope Modal Software
Exercise Objectives:
Students acquire the modal data set (7 data sets with a total of 99
FRF measurements), import the frequency response functions into the modal
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Modal Test of a
Porsche 914 (ok ... a VW 914): .
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HP 3566A 16 Channel Analyzer
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APS Model 113 Long Stroke Electro-Dynamic Shaker
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PCB Piezotronics Model 333A31 Accelerometers
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PCB Piezotronics Load Cell
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ME'Scope Modal Software
Exercise Objectives:
Students are asked to setup the test instrumentation, acquire the modal data set,
import the frequency response functions into one of the three modal packages listed above,
set-up the modal geometry, curve fit the data and animate the mode shapes.
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Sine Dwell Test of a
Porsche 914:
Exercise Objectives:
A sine wave is used the drive the APS Model 113 Long Stroke
Electro-Dynamic Shaker at each of the vehicle resonance's identified during the
modal test. The students have the opportunity to get a "hands-on" feel for
the suspension modes and the first couple of structural modes. |
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Evening Session (Wednesday Night -
8:40 pm):
Laboratory Exercise - Modal Test on a
914:
Exercise Objectives:
The Students setup the transducer, measure the position & angels
and the test instrumentation.
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Evening Session (Wednesday Night -
9:40 pm):
[The curvature of the
Porsche needs some special attention. What is the transducer
orientation and angles & how accurate do we have to be ? I wouldn't ask
this guy.] |
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Laboratory Exercise - Impact Hammer Calibration:
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According to Newton, F = m * a
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Did he have Hammer Calibration in mind?
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How do you set up a calibration mass?
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How does the load cell sensitivity change with tip
hardness, mass extenders, etc.?
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RCAL IBASIC Software Application
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Laboratory Exercise - Modal Test of a Disk Drive
Chassis:
Exercise Objectives:
Students are asked to setup the test instrumentation, acquire the modal data set,
import the frequency response functions into one of the three modal packages listed above,
set-up the modal geometry, curve fit the data and animate the mode shapes.
The unique aspect of this test is that the structural response is measured with a laser
vibormeter which sences the surface velocity. Is the modal response proportional to
the real or imaginary part of the frequency response? |
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Laboratory Exercise - Modal Test of a Golf Club:
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HP 35670A Analyzer
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PCB Piezotronics Impact Hammer
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PCB Piezotronics Accelerometer
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STAR Modal, CADA-PC & ME'Scope Modal Software
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RRIT Roving Response Impact Testing,
IBASIC Software Application
Exercise Objectives:
Students are asked to setup the test instrumentation, acquire the modal data set,
import the frequency response functions into one of the three modal packages listed above,
set-up the modal geometry, curve fit the data and animate the mode shapes. |
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Laboratory Exercise - Modal Test
on the Jim Beam:
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HP 35670A Analyzer
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PCB Piezotronics Impact Hammer
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PCB Piezotronics Accelerometer
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STAR Modal, CADA-PC & ME'Scope Modal Software
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RRIT Roving Response Impact Testing,
IBASIC Software Application
Exercise Objectives:
Students are asked to setup the test instrumentation, acquire the modal data set
(approx. 33 measurements),
import the frequency response functions into one of the three modal packages listed above,
set-up the modal geometry, curve fit the data and animate the mode shapes. |
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Laboratory Exercise - Modal Test
on a Thin Plate:
Exercise Objectives:
The Student setup his test plate and the test instrumentation.
A total of 20 FRFs were acquired on a 3" x 5" plate. The suspended
plate was impacted with a miniature impact hammer (Looks like he got a
workout.). The response was acquired in terms of surface velocity
with a Fiberoptic Laser. The frequency response functions were imported into one of the three modal packages.
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Evening Session Break (Wednesday Night - 10:30 pm):
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He finished the pizza and beer.
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I wonder if he completed his modal test ?
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[Don't worry Dave, we haven't E-mailed this picture to anyone at your
office. By the way, I asked Hans "not "to give our web address to your
wife. Unfortunately, she called before I spoke with him. Sorry, Jim]
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Evening Session Break (Wednesday Night - 10:00 pm):
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