This paper on "System Model Development Using Frequency Response Functions for Computer Related Equipment" was presented at the NAFEMS World Congress on Effective Engineering Analysis - 25-28 April 1999, Newport, Rhode Island, USA.

Abstract

The design of desktop computer assemblies poses significant hurdles in order to develop analytical representations of these systems. Models are typically generated using finite element modeling techniques. However, these models can become excessively large, especially as the need to address higher frequencies becomes more important. The modeling of joints and component interconnections also require significant model refinement. Accurate finite element representations of components in a computer chassis assembly, such as the power supply and hard drives, are not easily developed and attention must be paid to appropriate modeling of component attachment points. Consequently, finite element models of the assembled system can become quite large due partially to the need to adequately describe the dynamics of the system at higher frequencies as well as the inclusion of detailed individual component models.
Hybrid (impedance) modeling is a common technique used for the development of substructured system models. This technique can overcome some of the difficulties that trouble the development of a large assembled system model. One very important aspect of this modeling technique is that it can be used with both experimental and analytical data. This paper presents the results of the application of these hybrid modeling techniques for some computer related equipment applications. The advantages of using the technique are discussed. Alternate uses of this approach are also discussed for individual components.