Over the last 25 years, Finite Element Analysis (FEA) has become more powerful, accessible, and affordable. But the need for physical vibration testing has remained, for correlation, verification, package testing or final acceptance.
As a first step, hammers can be used. Theoretically, modal or structural testing can be performed by exciting mechanical products with a hammer. In practice, the limited energy hammers transfer rapidly present challenges, not to mention potential repeatability issues.
As a second step, small exciters can be connected to the tested product. Moving from white noise to sine sweep improves repeatability. But the signal to noise ratio remains a challenge as small exciters introduce small levels of energy.
As a third step, medium to large shakers can be used. The tested systems are both supported and excited by the shaker or the adjacent connected slip table. The shaker can then be used to test durability, packaging, resistance to shock, etc. but also for modal and structural analysis.
Like for most great technologies, market adoption is a process in itself and the number of shakers installed in Oceania keeps increasing.
Distributed and supported by NVMS, HBK LDS shakers have sine force peak ranging from 8.9N to 289.1kN and come with complete data acquisition systems. When combined, they are incredible technologies for product development, validation and acceptance.
Author: Christian Ebel (MEng, MBA, MIEAust) – Business Manager, Test & Measurement
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