In view of the lack of reliability research with correlated failure modes of the hoist disk shoes, the stochastic finite element method was used to analyze the reliability of multi-failure mode under emergency braking condition of disk shoe for deep well hoist. First, the finite element model of friction pair of brake disk and brake shoe was established based on the theory of heat conduction, the stress of brake shoe was simulated, and the influence of different initial braking speeds on friction pair temperature and thermal stress is analyzed. Second, the Latin hypercube sampling method was used to perform the design of experiment and the data of the random experiment are obtained. The Kriging model was used to establish the functional relationship between the random variables and the stress and temperature of the brake shoe. Then, based on the method of saddlepoint approximation, the reliability evaluation was carried out considering stress and temperature failure. Finally, the system reliability evaluation of brake shoe considering the correlation of the two failure modes is carried out based on Frank copula.

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The display with mini LED backlight has been known for the superior property of high contrast ratio and low power consumption. And it is also known for the field of display that high brightness and high reliability is requested for the automotive display. In order to achieve mini LED backlight application in automotive display, achieve the high reliability demand under high brightness situation is needed. Herein the application in automotive mini LED backlight materials, such as white ink, color conversion film &3D reflector etc. were tested and discussed. For the challenge of power and thermal issue, Comparison with the difference between conventional backlight and mini LED backlight were also mentioned. Area scan is a special visual performance SPEC for automotive display and herein the difficulty and improvement concept were also studied.

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