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Operational Modal analysis - how do get the compile data

Creator
Creator

Good evening ;

Today I have measured the operational modal analysis for exhaust comments with engine RPM lod Idle to maximum.
Note:
1.measured geometry point 15 points
2. I have only 5 accelerometer

Conducting our test there are 3 measurements for geometry point
1.measure 1 (point 1 to point 5)
2.measure 2 (point 6 to point 10)
3.measure 3 (point 11 to point 15)
Measurements conducting same condition.
But I can't compile data for Op.data processing the operational deflection shape.

How to solve the problem. Can you explain pls.

2 REPLIES

Re: Operational Modal analysis - how do get the compile data

Siemens Phenom Siemens Phenom
Siemens Phenom

Hello,  If you have no common channel in all 3 runs this cannot be done.

 

There is no way to maintain a phase relationship between the runs without a common reference channel (that is fairly active) in all the runs.

 

Here I show 4 runs with a common reference channel that I can turn on for all runs.  In this manner I can calculate the crosspowers on Op. Data Calculation and use them on Op. Data Selection.

 

1.jpgCommon reference channel in all runs, box:1:+Z2.jpgThe column is labeled with the reference channel, box:1:Z

Re: Operational Modal analysis - how do get the compile data

Creator
Creator
Thank you for your help