4. There are two disks: one (A) an engine flywheel, and the other (B) a clutch plate Attached to a transmission shaft. Their moments of inertia are l and Ig: initially, they are rotating with constant angular speeds wa and wB, respectively. We then push the disks together with forces acting along the axis, so as not to apply any torque on either disk. The disks rub against each other and eventually reach a common final angular speed a. Derive an expression for w. b. Find the final angular speed w after disks are pushed into contact, What happens to the kinetic energy during this process? (Given In Figure 1: flywheel A (2.0 kg), a radius of 0.20 m, and an initial angular speed of 50 rad/s (about 500 rpm) and that clutch plate B (4.0 kg), a radius of 0.10 m, and an initial angular speed of 200 rad/s. BEFORE Forces F and-F ae song the atiuf u and thus eier logio ahl ihis a either disk AFTER
Design Against Fluctuating Loads
Machine elements are subjected to varieties of loads, some components are subjected to static loads, while some machine components are subjected to fluctuating loads, whose load magnitude tends to fluctuate. The components of a machine, when rotating at a high speed, are subjected to a high degree of load, which fluctuates from a high value to a low value. For the machine elements under the action of static loads, static failure theories are applied to know the safe and hazardous working conditions and regions. However, most of the machine elements are subjected to variable or fluctuating stresses, due to the nature of load that fluctuates from high magnitude to low magnitude. Also, the nature of the loads is repetitive. For instance, shafts, bearings, cams and followers, and so on.
Design Against Fluctuating Load
Stress is defined as force per unit area. When there is localization of huge stresses in mechanical components, due to irregularities present in components and sudden changes in cross-section is known as stress concentration. For example, groves, keyways, screw threads, oil holes, splines etc. are irregularities.
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