Within the realm of transfer path analysis (TPA), the first step often involves characterizing the forces generated from an actively vibrating component – a process known as source characterization. The characterization can either be done using interface forces with the classical approach, or using blocked/equivalent forces with the component-based approach. Several methods are described here for determining these forces: classical TPA (interface forces) and component-based TPA (blocked forces/equivalent forces), which are explained below and in this whitepaper on source characterization.
Classical TPA is intended to identify transfer path contributions in existing products. The source excitation is represented by interface forces, which are a property of the assembly they are measured in. Their use for partial contribution analyses makes interface forces a valuable tool for determining which paths have the greatest contribution to the responses of interest.
Component-based TPA, on the other hand, is useful for simulating component vibration levels in new products. The source excitation is characterized by a set of equivalent forces that are an intrinsic property of the active component itself. More popularly, these forces are known as blocked forces, as they are the would-be forces (and moments!) when measured against a rigid boundary.
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