An OEM or a research interview is designed to test the ability of the candidate to solve a problem by applying physics-driven thinking skills. Unless the interviews are for people who would develop mechanical methods/mathematical models for high-end research interviews mostly check fundamentals, application and thinking skills.
Analysis: Let us consider a two-mass system and the equivalent of neutral axis is the node which is characterised by zero displacements.
The node initially lies in the middle. However, as the left mass or mass moment of inertia increases, the node shifts to the left towards the heavier mass (node is a point of zero displacements and antinode is a point of maximum displacement).
Observation: Both pressure vessels have growths that are different at weld line which leads to local bending.
This phenomenon is observed in many products where discontinuities of material temperature or thermal properties etc exist
Consider a spherical pressure vessel welded to a cylindrical pressure vessel. At the joint, the spherical pressure vessel and cylindrical pressure vessels have different growths when subjected to internal pressure. The table below gives the radial growths of both the vessels, which is nothing, but hoop strain multiplied by the radius.
Observation: The Gear is held between the centers. The gear axis is established using the digital height gauge. The roller is kept on Gear1 and dialed to already set (center distance plus the radius of the roller) height and set the dial to zero. Shift the roller to the next gear’s (gear 1) corresponding tooth space and dial the roller. The indicator reading is the relative angular position error. Since both gears are of same module, the same roller can be used since module is a measure tooth thickness or tooth space.
The error is computed as follows: Taking r1 and r2 as the pitch radii, let the angular position error be ∆θ. One roller axis kept in gear tooth space of Gear-1 is parallel to gear axis and hence error is contributed by only Gear-2.