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One of the primary military standards used for vibration testing has been updated to incorporate multi-axis simulation. The latest revision of this standard is MIL-STD-810G in which the addition of Method 527 allows for real-time road load data to be used for multi-axis simulation. This revision is looking to improve upon the previous vibration test method of single-axis random vibration in each direction. This document will overview the changes to the standard, provide a summary of the previous test methods, detail a test procedure using real-time data for multi-axis simulation, and present the procedure for the testing conducted with this data. In addition, it will help to demonstrate a method for using multi-axis simulation for MIL-STD-810G and help its readers gain a better understanding of this new method.

This paper provides a detailed review of the testing procedures utilized for FMVSS 216a - Roof Crush Resistance and by the Insurance Institute for Highway Safety (IIHS). This new FMVSS 216a standard, announced by the National Highway Traffic Safety Administration (NHTSA) on April 30, 2009, will result in significantly stronger roof structures. The standard specified four major changes: 1) The maximum applied force must equal three times the unloaded vehicle weight for vehicles with a gross vehicle weight rating of 6,000 pounds or less, 2) The standard is expanded to include vehicles with a gross vehicle weight rating between 6,000 and 10,000 pounds, 3) Head room maintenance is monitored through the use of a head form representing a 50th percentile male seated in the front occupant positions, and 4) The platen force, displacement, and head form contact requirements must be met on both sides of the vehicle's roof structure.