Theoretical Vibration Analysis Regarding Excitation due to Elliptical Shaft Journals in Sleeve Bearings of Electrical Motors

<table>Bearing housing velocities in (a) vertical direction (<svg height="9.5375004" id="M421" style="vertical-align:-0.273pt" version="1.1" viewbox="0 0 9.7124996 9.5375004" width="9.7124996" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.625,8.575)"><use xlink:href="#x1D467"></use></g>
</svg>-direction), (b) in horizontal direction (<svg height="13.3" id="M422" style="vertical-align:-3.56265pt" version="1.1" viewbox="0 0 11.0875 13.3" width="11.0875" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.625,8.238)"><use xlink:href="#x1D466"></use></g>
</svg>-direction). Boundary condition: identical orientation of the elliptical shaft journals (<svg height="13.45" id="M423" style="vertical-align:-3.56265pt" version="1.1" viewbox="0 0 53.599998 13.45" width="53.599998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.625,8.387)"><use xlink:href="#x1D711"></use></g>
<g transform="matrix(.012,-0,0,-.012,10.512,12.475)"><use xlink:href="#x1D7CF"></use></g>
<g transform="matrix(.017,-0,0,-.017,21.813,8.387)"><use xlink:href="#x3D"></use></g><g transform="matrix(.017,-0,0,-.017,36.499,8.387)"><use xlink:href="#x1D711"></use></g>
<g transform="matrix(.012,-0,0,-.012,46.4,12.475)"><use xlink:href="#x1D7D0"></use></g>
</svg>) and different rotor speeds <svg height="9.2875004" id="M424" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.7 9.2875004" width="10.7" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.625,8.662)"><use xlink:href="#x1D427"></use></g>
</svg><i>. </i></table>

International Journal of Rotating Machinery

fig14

Figure 14

Figure 14: Theoretical Vibration Analysis Regarding Excitation due to Elliptical Shaft Journals in Sleeve Bearings of Electrical Motors 