U - f - N

Positioning and objective

The aim of the test “Mechanics – NVH – Spectrogram – U-f-N” is to perform NVH analysis on the machine when operating at a set of targeted working points defined with the following inputs values U, f, N (Line-Line voltage, Power supply frequency, Speed).

This test is available only in the beta mode. It means that all the computation process and results are not entirely qualified yet. However, this gives users, the capability to use and to evaluate this new feature by themselves.

Figure 1. “Working point – Sine wave – Motor – U, f, N” Illustration

This test give data allowing NVH prediction in early electromagnetic and design stage.

The modal analysis of the stator mechanical structure, the sound power level spectrogram per engine order versus speed and the resulting overall weighted sound power level versus speed are computed and displayed.

These results allow to see if there are any problems linked with NVH over the considered speed range.

And finally, this test helps to answer the following question: Could the machine have any risks in connection with NVH? Yes / No.

The following table helps to classify the test “Mechanics – NVH – Spectrogram – U-f-N”.

Table 1. Positioning of the test “Mechanics – NVH – Spectrogram – U-f-N”
Family	Mechanics - NVH
Package	Spectrogram
Convention	#
Test	U-f-N

Subsections

Inputs

For more details, please refer to Inputs.

Thermal

For more details, please refer to Thermal.

Mechanics

For more details, please refer to Mechanics.