Experimental Verification of Drop Impact Test and Analysis for Mobile Electronics

Choi, Byungjoo; Yeom, Hyunho; Jeon, Yongho; Lee, Moon Gu

doi:10.3850/978-981-11-0749-8_685

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“…In the case of the impact durability test dropping from 1.8 m, from a human ear’s height, only a 10% malfunction rate for the haptic actuator mounted in a smartphone is allowed in the industry. In order to satisfy this criterion, many suppliers have performed several research activities, such as reliability testing and analytical work [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. The drop test, which is one of the experimental methods, is the most accurate way to study the impact resistance of a mobile device.…”

Section: Introductionmentioning

confidence: 99%

Development of Novel Platform to Predict the Mechanical Damage of a Miniature Mobile Haptic Actuator

Choi

Kwon²,

Jeon

et al. 2017

Micromachines

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Impact characterization of a linear resonant actuator (LRA) is studied experimentally by a newly-developed drop tester, which can control various experimental uncertainties, such as rotational moment, air resistance, secondary impact, and so on. The feasibility of this test apparatus was verified by a comparison with a free fall test. By utilizing a high-speed camera and measuring the vibrational displacement of the spring material, the impact behavior was captured and the damping ratio of the system was defined. Based on the above processes, a finite element model was established and the experimental and analytical results were successfully correlated. Finally, the damage of the system from impact loading can be expected by the developed model and, as a result, this research can improve the impact reliability of the LRA.

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