Time-dependent mechanism reliability analysis based on envelope function and vine-copula function

Wang, Zhihua; Yu, Shui; Zhang, Kewang

doi:10.1016/j.mechmachtheory.2019.01.008

Cited by 63 publications

(21 citation statements)

References 31 publications

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“…Our future research includes the following aspects: (1) MAV applications to agriculture, such as autonomous pollination [40]; (2) high efficiency and reliability in design for the MAV's key components [41]- [47] using new AI algorithms, with the support of the parallel CIAD framework [48].…”

Section: Resultsmentioning

confidence: 99%

Experimental Studies of Tail Shapes for Hummingbird-Like Flapping Wing Micro Air Vehicles

et al. 2020

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The stability of flying of a hummingbird-like flapping-wing micro air vehicle (MAV) has been challenging. In this paper, experimental studies are reported on the tail shapes of hummingbird-like flappingwing MAVs, since tails play an important role in-flight stability. Dynamics parameters of hummingbird tails are firstly studied and evaluated. Then man-made tails inspired by the natural hummingbirds are designed, manufactured and optimized for experimental tests. The results show that lift generated by the tail is independent of a fan angle, whereas the pitch moment is related to the fan angle. Further, the tail can be applied to stabilising hovering twin-wing flapping wing MAVs. INDEX TERMS Hummingbird tail, flapping wing MAV, hovering flight, tail design, tail fabrication.

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Section: Resultsmentioning

confidence: 99%

Experimental Studies of Tail Shapes for Hummingbird-Like Flapping Wing Micro Air Vehicles

et al. 2020

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“…When the performance exceeds the specified threshold, the product is considered to be failed and the failure is the so-called degradation failure. Currently, there are two kinds of methods to build the reliability models [12]- [14]. One method is to build the reliability model by analyzing the physical and chemical factors based on the failure mechanism, which cause the failure of the product.…”

Section: Degradation Failure Modelmentioning

confidence: 99%

Reliability Analysis of Vertical Cavity Surface-Emitting Lasers Based on the Gamma Process

Luo

2020

IEEE Access

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Due to the long life and high reliability of vertical cavity surface-emitting lasers, the performance degradation experiment cost is high, and the experiment cycle is long, because the degradation failure process of a semiconductor laser is a monotonic decreasing process, and the amount of performance degradation is independent for each function. Therefore, based on the Gamma process, the degradation performance of vertical cavity surface-emitting lasers has been modeled and analyzed in this paper. First, a model is given based on the Gamma process. Then, the failure distribution of the product is determined by analyzing the first arrival time distribution of the process, and then, the reliability of the product is statistically deduced to determine the residual life distribution of the device. Finally, combined with the data obtained from accelerated aging experiments, the product failure time of 261 470 hours is deduced, approximately 30 years. The model is in good agreement with the experimental results, which proves the validity of the model and provides a theoretical basis for the analysis of the reliability of the vertical cavity surface-emitting laser. According to the model, the reliability of the device decreases to 0.9994 after 100 000 hours of operation.

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“…3) the trend index of moving min of the average precision (mminAP) and the index of moving min of the standard deviation (mminSTD),as given in equations (17) and (18), respectively.…”

Section: Three Pairs Of Trend Indicesmentioning

confidence: 99%

“…As shown in Figure 5, from top to bottom, the solid lines are the trend indices of mmaxAP, mmAP and mminAP of a fitness function in a vector f j , as given in equations (15), (13) and (17), respectively. The dashed lines are the boundaries of mmaxAP ± mmaxSTD, mmAP ± mmSTD and mminAP ± mminSTD values for each vector f j , as defined in Equations (16), (14) and (18), which illustrate the tracking shape of the evolutionary pathway for the optimization process, generation versus fitness f in this case, as the upper and lower boundaries.…”

Section: Evolutionary Pathwaymentioning

confidence: 99%

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How Can Artificial Intelligence Help With Space Missions - A Case Study: Computational Intelligence-Assisted Design of Space Tether for Payload Orbital Transfer Under Uncertainties

Ren

Chen

2019

IEEE Access

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In the era of artificial intelligence (AI), many industry sectors, including space exploration, have experienced a shift in the way business is conducted due to the widespread use of AI technologies. In the past few years, AI has become a key tool used to explore the universe in space missions. In this paper, a multi-objective optimal design for payload orbital transfer involving space tethers is proposed based on a computational intelligence-assisted design framework with the artificial wolf pack algorithm (AWPA). Enlightened by the social behaviors of a wolf pack and its swarm intelligence, the AWPA is utilized for optimization problems in which a logsig function randomly obtains assignments for parents and offspring. Swarmwolf , a simulation toolbox with given initial conditions. The proposed method effectively performs optimization tasks based on index of evolutionary pathway trends, has been defined to demonstrate the optimizing process. The results show that the proposed approach works expeditiously for the optimization of space tether model and its application. INDEX TERMS Artificial intelligence, artificial wolf-pack algorithm, computational intelligence assisted design, evolutionary pathway, multi-objective optimization, payload orbital transfer, space tether.

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Time-dependent mechanism reliability analysis based on envelope function and vine-copula function

Cited by 63 publications

References 31 publications

Experimental Studies of Tail Shapes for Hummingbird-Like Flapping Wing Micro Air Vehicles

Experimental Studies of Tail Shapes for Hummingbird-Like Flapping Wing Micro Air Vehicles

Reliability Analysis of Vertical Cavity Surface-Emitting Lasers Based on the Gamma Process

How Can Artificial Intelligence Help With Space Missions - A Case Study: Computational Intelligence-Assisted Design of Space Tether for Payload Orbital Transfer Under Uncertainties

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