2.2. The NVH Ribbon

When the NVH Add-on is loaded, the NVH ribbon is accessible. It displays the following buttons:

 

MAC Calculator

Introduces a result that computes the Modal Assurance Criterion (MAC) between Ansys Mechanical modal analysis results (rst) and experimental results (unv) or between two different rst results. It offers several preprocessing/postprocessing capabilities:

  • Mode selection and flip

  • Mode pairing

  • Node selection and position tuning of UNV nodes

  • UNV/RST (File 2) model orientation

  • Preview Matching Nodes

  • Data Interpolation

  • Complex to Real Projection

  • Filtering Options

  • Cyclic Optimization specific workflow

  • Interactive MAC Table

  • Interactive side-by-side Mode Animation

  • Capability of working with On Demand Expansion

Stress/Strain Recovery

Introduces a result that computes the elastic Stress/Strain fields obtained of the linear superposition of modes according to a Modal Coordinates File (mcf).

FRF Calculator

Introduces a result that computes the Frequency Response Function (FRF) for a given set of input and output degrees of freedom (DOFs). It offers several preprocessing/postprocessing capabilities:

  • Calculate FRF in tailored frequency intervals

  • Adjust damping of individual modes

  • Input/output DOFs rotated to custom reference frame

  • Calculate FRF in terms of Compliance (X/F), Mobility (V/F) or Accelerance (A/F) of the input/output DOFs, along with their inverse values for Dynamic Stiffness (F/X), Impedance (F/V) or Dynamic Mass (F/A)

  • Export FRFs to csv and unv format

  • Load and review UNV model FRF data, with custom orientation

  • Compare computational FRFs or computational and experimental FRFs

  • Pair UNV FRFs

Pre-Test Calculator

Introduces a result that identifies optimum sensor and exciter locations for vibration tests. It offers several preprocessing and postprocessing capabilities:

  • Identify optimum sensor locations using the Effective Independence Method (EIM)

  • Identify optimum exciter locations using the Driving-Point Frequency Response Function (DPFRF) method

  • Allow custom orientation of both sensors and exciters

  • Export the sensor modal results (mode shapes) in unv format

  • Export the exciter modal results (mode shapes and DPFRFs) in unv format

  • Manual addition of sensors

  • Analyze sensor mass effect

  • Interactive AutoMAC Table

EM Loads - XML Converter

Introduces a mechanical wizard panel to convert load data from .csv format to .xml format. It offers the following capabilities:

  • Convert single or multiple .csv load files

  • Allows radial, tangential and all force components

  • Can convert load data available in the time domain to the frequency domain using a Fast Fourier Transform (FFT)