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Example 8 - Overhung rotor.ΒΆ

In this example, we use the rotor seen in Example 5.9.9 from [Friswell, 2010].

The shaft is \(1.5m\) long and the diameter is \(50 mm\) with a disk of diameter \(350mm\) and thickness \(70 mm\). The two bearings, have a stiffness of \(10 MN/m\) in each direction. The shaft and disk are made of steel. Damping is neglected.

import ross as rs
import numpy as np
shaft_elements = []
disk_elements = []
bearing_seal_elements = []
steel = rs.steel

bearing_seal_elements.append(rs.BearingElement(n=0, kxx=10e6, kyy=10e6, cxx=0, cyy=0))
bearing_seal_elements.append(rs.BearingElement(n=1, kxx=10e6, kyy=10e6, cxx=0, cyy=0))

shaft_elements.append(rs.ShaftElement(material=steel, n=0, L=1, odl=0.05, idl=0))
shaft_elements.append(rs.ShaftElement(material=steel, n=1, L=0.5, odl=0.05, idl=0))

disk_elements.append(
    rs.DiskElement.from_geometry(n=2, i_d=0.05, o_d=0.35, width=0.07, material=steel)
)

# Moment approach
overhung_rotor = rs.Rotor(
    shaft_elements=shaft_elements,
    bearing_elements=bearing_seal_elements,
    disk_elements=disk_elements,
)
# from section approach
leng_data = [1.0, 0.5]

overhung_from_section_rotor = rs.Rotor.from_section(
    brg_seal_data=bearing_seal_elements,
    disk_data=disk_elements,
    leng_data=leng_data,
    idl_data=[0, 0],
    odl_data=[0.05, 0.05],
    material_data=steel,
)
overhung_from_section_rotor.plot_rotor()