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Stiffness of the shaft and its support; Total mass of shaft and attached parts; Unbalance of the mass with respect to the axis of rotation; The amount of damping in the system; In general, it is necessary to calculate the critical speed of a rotating shaft, such as a fan shaft, in order to avoid issues with noise and vibration.
An alternative design is the controllable-pitch propeller (CPP, or CRP for controllable-reversible pitch), where the blades are rotated normally to the drive shaft by additional machinery – usually hydraulics – at the hub and control linkages running down the shaft. This allows the drive machinery to operate at a constant speed while the ...
This is also called the polar moment of the area, and is the sum of the second moments about the - and -axes. [24] The stresses in a beam are calculated using the second moment of the cross-sectional area around either the x {\displaystyle x} -axis or y {\displaystyle y} -axis depending on the load.
axial stress, a normal stress parallel to the axis of cylindrical symmetry. radial stress , a normal stress in directions coplanar with but perpendicular to the symmetry axis. These three principal stresses- hoop, longitudinal, and radial can be calculated analytically using a mutually perpendicular tri-axial stress system.
An axial or thrust ball bearing uses side-by-side races. An axial load is transmitted directly through the bearing, while a radial load is poorly supported and tends to separate the races, so that a larger radial load is likely to damage the bearing. Deep-groove
This coupling features two face-to-face magnetized disks: the driving magnet on the dry side, and the driven magnet on the underwater side. Torque is transferred by shear forces between the attracting magnetic disks, [5] but this attraction can also produce an axial load as the disks pull on each other. There are two main designs for the ...
where the sides of the equally spaced grooves are usually involute, but the male teeth are modified to allow for misalignment. Serrations where the sides of the equally spaced grooves form a "V". These are used on small-diameter shafts. Helical splines where the equally spaced grooves form a helix about the shaft. The sides may be parallel or ...
Tensile and compressive stresses increase proportionally with bending moment, but are also dependent on the second moment of area of the cross-section of a beam (that is, the shape of the cross-section, such as a circle, square or I-beam being common structural shapes).