
Laboratory Exercise  Modal Test
on the Jim Beam:

Data Physics MultiChannel Data Acquisition with
the Abacus System

PCB Piezotronics Impact Hammer

PCB Piezotronics Mini TriAxial Accelerometer

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
package 

Modal Test of a
Porsche 914 (ok ... a VW 914): .

HP 3566A 16 Channel Analyzer

APS Model 113 Long Stroke ElectroDynamic Shaker

PCB Piezotronics Model 333A31 Accelerometers

PCB Piezotronics Load Cell

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,
setup the modal geometry, curve fit the data and animate the mode shapes.


Sine Dwell Test of a
Porsche 914:
Exercise Objectives:
A sine wave is used the drive the APS Model 113 Long Stroke
ElectroDynamic Shaker at each of the vehicle resonance's identified during the
modal test. The students have the opportunity to get a "handson" feel for
the suspension modes and the first couple of structural modes. 

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.


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.] 

Laboratory Exercise  Impact Hammer Calibration:

According to Newton, F = m * a

Did he have Hammer Calibration in mind?

How do you set up a calibration mass?

How does the load cell sensitivity change with tip
hardness, mass extenders, etc.?

RCAL IBASIC Software Application


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,
setup 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? 

Laboratory Exercise  Modal Test of a Golf Club:

HP 35670A Analyzer

PCB Piezotronics Impact Hammer

PCB Piezotronics Accelerometer

STAR Modal, CADAPC & ME'Scope Modal Software

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,
setup the modal geometry, curve fit the data and animate the mode shapes. 

Laboratory Exercise  Modal Test
on the Jim Beam:

HP 35670A Analyzer

PCB Piezotronics Impact Hammer

PCB Piezotronics Accelerometer

STAR Modal, CADAPC & ME'Scope Modal Software

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,
setup the modal geometry, curve fit the data and animate the mode shapes. 

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.


Evening Session Break (Wednesday Night  10:30 pm):

He finished the pizza and beer.

I wonder if he completed his modal test ?

[Don't worry Dave, we haven't Emailed 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]


Evening Session Break (Wednesday Night  10:00 pm):
