Why Shock Measurements Performed at Different Facilities Don't Agree

The "round-robins" that have been performed and discussions among practitioners of the art of shock testing demonstrate that the results obtained from mechanical shock experiments performed in different laboratories vary widely. In addition, it has been found that different generations of hardware/software systems from one of the major system vendors produce results that disagree by 30%. The obvious question is: WHY? The paper describes a study that examines some of the critical parameters that effect Shock Response Spectrum (SRS) results and reports on how they are used by the practitioners in the field. Parameters that effect the analysis include anti-alias filter characteristics, ac-coupling strategies, analysis frequencies, sample rate, and analysis algorithm/strategy. The paper reports the effects of the parameters as used in several commercial and home-built systems.

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