ABSTRACT
In Chapter 2, concrete experimental types of casings are presented, and their geometrical and material parameters are given. The first type of casing considered is a casing with a rigid structure consisting of a heavy frame to which walls constructed of one or two panels connected in parallel are attached. This design makes it possible to reduce the number of phenomena occurring by rigidly fixing the boundary conditions of the walls, thereby eliminating the influence of the vibrations of each wall on the boundary conditions of adjacent walls. The degree of complication is increased in the second type of casing—a casing with flexible structure, made of folded and properly jointed walls, without the mediation of an additional frame. Then, under the influence of vibrations forced by noise or control, the casing undergoes temporary deformations of shape, increasing the research challenge.
The third type of casing—the casing of a real device—is definitely more challenging. A top-loading washing machine purchased from a supermarket is used as an example. Such a casing is characterized by a complex shape, different types of materials and connections, openings, and a multitude of phenomena occurring and interacting.
