Simultaneous three‐translational‐axis vibration test that considers non‐Gaussianity

Abstract

Packaging vibration tests are used to evaluate the vibration durability of packaged products by simulating transport vibration. Currently, the vertical Gaussian random vibration test is commonly used. However, in actual transport vibration environments, non-Gaussian random vibration occurs along various axes simultaneously.To simulate actual transport vibration environments accurately and realistically, this study developed a simultaneous three-translational-axis vibration test that considers the three-axis simultaneity of shock events, which is unique to non-Gaussian vibration. In addition, to verify the effectiveness of the test, an experiment on the collapse of packaged products was performed by using three sets of vibration data (actual transport vibration data and vibration data with and without the three-axis simultaneity of shock events), and the collapse time for each dataset was measured. The collapse time obtained using the vibration data with the three-axis simultaneity of shock events was closer to the collapse time obtained using the actual transport vibration data than the collapse time obtained using the vibration data without the three-axis simultaneity of shock events. Therefore, the simultaneous three-translational-axis vibration test that does not consider the three-axis simultaneity of shock events may give different results from those obtained under actual transport vibration conditions. Therefore, to simulate actual transport vibration environments accurately and realistically, a simultaneous three-translationalaxis vibration test that considers the three-axis simultaneity of shock events should be performed.

Controlling the kinematics of a spring-pendulum system using an energy harvesting device

“…22 It should be pointed out that non-Gaussian random vibration test can also be applied effectively. [43][44][45] To realize this objective, we approximate the functions sin φ and cos φ up to third-order using the Taylor series, which are valid in close proximity to static equilibrium. Therefore, equations ( 9)-( 11) can be rewritten in the form…”