Meaning
Mathematical representations of the peak acceleration experienced by a product across a range of frequencies during distribution define the mechanical stress envelope for protective packaging. Analyzing the transport shock spectra allows engineers to simulate the impacts of rail shunting or aircraft landings. The data is typically gathered using tri-axial accelerometers mounted on a test pallet.
Dynamic Load
Acceleration levels vary significantly depending on the mode of travel and the quality of the infrastructure. The transport shock spectra provide a worst case scenario for the design of internal cushioning. Peak G-forces are plotted against frequency to show the resonance points where damage is most likely to occur.
Mitigation Requirement
Protective enclosures must dampen the energy identified in the frequency profile to keep the internal component within its fragility rating. Designers use the transport shock spectra to select the density and thickness of foam inserts. If the vibration and impact energy is not managed, the solder joints or connectors in the device may fail.
Verification Standard
Compliance with international shipping regulations requires testing against a standardized version of these profiles. Laboratory shakers replicate the transport shock spectra to validate that the product arrives at the customer in working condition. This testing reduces the number of returns and warranty claims related to transit damage.
