Quick Answer
The modal assurance criterion (mac) for fea-test mode correlation calculator computes modal assurance criterion (mac) from the input values you provide.
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Find Engineering Solutions →Result Interpretation
Modal Assurance Criterion (MAC) for FEA-Test Mode Correlation calculator computes Modal Assurance Criterion (MAC) in dimensionless using the defined engineering formula and the input values provided. Modal Assurance Criterion (MAC) is expressed in dimensionless. No universal acceptance threshold is defined by this calculator.
Worked Example
Verified calculation
Given:
- Dot product of FEA and test mode shape vectors = 0.92
- Squared L2 norm of FEA mode shape vector = 1
- Squared L2 norm of test mode shape vector = 1
Expected Result:
- Modal Assurance Criterion (MAC) = 0.8464
Engineering Interpretation:
Under the given input conditions, the calculated result is: Modal Assurance Criterion (MAC) = 0.8464 dimensionless.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.
Formula / Method
MAC = pow(dot product of fea and test mode shape vectors, 2) / (squared l2 norm of fea mode shape vector * squared l2 norm of test mode shape vector)Modal Assurance Criterion (MAC).
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| dot_product | Dot product of FEA and test mode shape vectors | INPUT | Dot product of FEA and test mode shape vectors |
| norm_sq_fea | Squared L2 norm of FEA mode shape vector | INPUT | Squared L2 norm of FEA mode shape vector |
| norm_sq_test | Squared L2 norm of test mode shape vector | INPUT | Squared L2 norm of test mode shape vector |
| result | Modal Assurance Criterion (MAC) | OUTPUT | Modal Assurance Criterion (MAC) |
Calculation Steps
- Enter the dot product of fea and test mode shape vectors in dimensionless.
- Enter the squared l2 norm of fea mode shape vector in dimensionless.
- Enter the squared l2 norm of test mode shape vector in dimensionless.
- Step 1: Compute modal assurance criterion (mac).
- Read the modal assurance criterion (mac) (dimensionless) from the results.
Frequently Asked Questions
What does this calculator calculate?
The Modal Assurance Criterion (MAC) for FEA-Test Mode Correlation calculator estimates Modal Assurance Criterion (MAC) based on the input parameters you provide
Why is dot product of fea and test mode shape vectors important in this calculation?
dot product of fea and test mode shape vectors is used directly in the calculation of modal assurance criterion (mac). Its effect on the result depends on the complete formula and the values of the other inputs.. When you enter dot product of fea and test mode shape vectors in dimensionless, the calculator uses it in the engineering formula to compute the output
How should I interpret the result modal assurance criterion (mac)?
The calculator outputs modal assurance criterion (mac) in dimensionless. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Dot product of FEA and test mode shape vectors (dimensionless), Squared L2 norm of FEA mode shape vector (dimensionless), Squared L2 norm of test mode shape vector (dimensionless). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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