On the variability of blocked forces determined using an inverse approach

Mount force data of motors, fans, and pumps is rarely available from the suppliers. However, manufacturers are beginning to ask for and even require this information from their suppliers. In-situ estimation of these forces can be accomplished using blocked force transfer path analysis. Since these forces are difficult to measure directly, forces are calculated using an inverse approach. A simple case study is considered on a commercial air handler. Blocked forces are determined using different inlet locations and path selections. The consistency of the inversely calculated forces is evaluated.