Modal Analysis of a Gearbox Housing in Order to Avoid Resonance …
345
Fig. 1 3D model of bottom housing and upper housing
in order to find out the presence of any critical speed in the operating range of the
gearbox.
Thereupon, using SolidWorks facilities, the 3D model of the housing was build
and an FEA was performed in order to determine the first six natural frequencies and
the corresponding mode shapes. Supplementary, the Inventor software was employed
to determine the mode shapes and the natural frequencies of the housing. The experimentally obtained eigenfrequencies were compared with the FEA results acquired
with the two different software utilities.
3 Experimental Modal Analysis
In this study, the EMA results were used to calibrate the FEA and to validate the
underlying presumptions (boundary conditions and material properties).
For determining the natural frequencies of the gearbox housing using EMA, the
test rig, shown in Fig. 2, was organized. To simulate real operating conditions, the
housing (1) was rigidly fixed on a frame (2). For impacting the structure, a PCB
6
5
1
4
3
2
Fig. 2 Views of the test rig
345
Fig. 1 3D model of bottom housing and upper housing
in order to find out the presence of any critical speed in the operating range of the
gearbox.
Thereupon, using SolidWorks facilities, the 3D model of the housing was build
and an FEA was performed in order to determine the first six natural frequencies and
the corresponding mode shapes. Supplementary, the Inventor software was employed
to determine the mode shapes and the natural frequencies of the housing. The experimentally obtained eigenfrequencies were compared with the FEA results acquired
with the two different software utilities.
3 Experimental Modal Analysis
In this study, the EMA results were used to calibrate the FEA and to validate the
underlying presumptions (boundary conditions and material properties).
For determining the natural frequencies of the gearbox housing using EMA, the
test rig, shown in Fig. 2, was organized. To simulate real operating conditions, the
housing (1) was rigidly fixed on a frame (2). For impacting the structure, a PCB
6
5
1
4
3
2
Fig. 2 Views of the test rig