Order analyses

Order analyses are great to troubleshoot the NVH of components with rotating parts, like e-motors, or compressors, because you can really focus on their relevant characteristics. In SOURCE, you can also calculate order blocked forces and TPA syntheses.

How to: Import and display order data

You can import such order data in the ATFX format. Datasets of the type Order Blocks show the extracted order spectra over time. You can display them over the RPM channel if you want to study your component at a certain speed.

Next to these 3D order spectra, you can also work with 2D order cuts – so, individual order lines of the order spectra. These datasets can contain multiple order lines, which you can select next to the channels. Again, you can display them over rotational speed, and over time, or over the frequency which is derived from the rotational speed and the order. So, the frequency range will be different for each order. This translation from order to frequency is also used in the calculations of the blocked forces.

How to: Calculate order Blocked Forces

The process to get blocked forces, works just like for any other dataset. So, you can select order data and any other operational datasets as inputs for the same analysis. For order data, SOURCE does all the TPA calculations based on the derived frequency lines of the order data which we saw before.

SOURCE then applies linear interpolation to estimate the FRF at the frequencies of the operational data. As a result, we get order-based Blocked Forces and TPA syntheses. So you can quickly make an on-board validation directly for orders, or identify the relevant excitation in the order blocked forces. And, you can also export order datasets.