Systems Engineering: Availability and Reliability

Antosz, Katarzyna; Machado, José; Mazurkiewicz, Dariusz; Antonelli, Dario; Soares, Filomena

doi:10.3390/app12052504

Cited by 15 publications

(11 citation statements)

References 16 publications

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“…The main catch in this algorithm is that the stiffness coefficients, as can be seen from the formulas, depend both on the orientation of each layer and on their quantity (or total thickness) [ 14 ]. Even for one calculation case it is difficult to rewrite the formulas to determine the dependence of the tensile strength on some specific characteristics.…”

Section: Methodsmentioning

confidence: 99%

Composite Lamina Model Design with the Use of Heuristic Optimization

2023

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In engineering practice, a problem is quite often faced in which the number of unknown parameters exceeds the number of conditions or requirements or, otherwise, there are too many requirements for too few parameters to design. Such under- or over-defined tasks are sometimes not possible to solve using a direct approach. The number of solutions to such problems is multiple, and it is most rational to search for the optimal one by numerical methods since the more unknown design parameters there are to be designed, the more potential solutions there are. This article discusses a way to find an optimal solution to such an underdetermined problem by heuristic optimization methods on the basis of the example of designing a composite wing skin of an aircraft. Several heuristic approaches, specifically gradient descent and Tabu search, are studied to solve the design problem and to locate an optimal solution. They are also compared to a conventional direct approach. The examined composite lamina is optimized by the target function of minimum weight with the constraints of strength and buckling failure criteria. In most of the observed cases, the heuristic method designed structures which were considerably better than the structures that were obtained by conventional direct approaches in terms of the weight to load ratio.

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Section: Methodsmentioning

confidence: 99%

Composite Lamina Model Design with the Use of Heuristic Optimization

2023

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“…These updates are part of the wave called Industry 4.0, which is a trend directly associated with process reliability and availability issues and driving industrial innovations. Given the aforementioned growth in the use of natural products such as EOs, there is a need to achieve higher yields, better quality, and shorter extraction periods [13]. Technological updates could enhance features of the steam distillation process, such as reducing degradation of substances, increasing the quality of the final product, and obtaining higher yields of EO.…”

Section: Of 15mentioning

confidence: 99%

Steam Distillation for Essential Oil Extraction: An Evaluation of Technological Advances Based on an Analysis of Patent Documents

et al. 2022

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The most-used method for essential oil extraction is steam distillation due to its simplicity and low investment requirements. Due to the importance of this extractive method, technological updates represent an immense opportunity for improving this component of essential oil production. In order to evaluate how such updates have been applied to essential oil production, in this study, we conducted a technological prospection. A total of 490 patent documents were retrieved and indicators were evaluated, which included publication trends, main applicants and inventors of the prospected technologies, main depositing countries and potential markets for the inventions, and classification codes assigned to the patent documents. The results indicated that steam distillation is used by different sectors and that it is an important industrial process that has been growing in recent years. In terms of associated technological updates, we observed that only some patent documents referred to the application of technological updates, indicating that processes could still be investigated and incorporated into the technology. Thus, the advancement of studies to improve this process could contribute even more to its visible growth, increasing its application potential and process yield.

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“…This paper analyses the continuity of the functioning of the system, assuming the availability of reserve vehicles to increase the reliability of the fleet according to the redundancy law [8]. Another option is to consider introducing intelligent transport vehicles with self-diagnostic and learning systems capable of sustainable self-maintenance [1].…”

Section: Introductionmentioning

confidence: 99%

Operational risk assessment model for city buses

Niewczas¹,

Mórawski²,

Rymarz³

et al. 2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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The development of public transport systems presently focuses on sustainability. In this situation, the issue of user (passenger) migration has become important to the transport company as a service provider. This paper presents an integrated model of the operational risk of vehicle incapacity, including the following: costs of incidental repairs, costs of unplanned downtime and costs resulting from potential user migration. The paper presents the results of operational research on buses of two makes over a period of 6 years, in the mileage range of 0–420 000 km. The authors have determined the risk as a regression function of operational mileage to estimate the optimum life cycle. The quality of the vehicle was assessed using the criterion of the maximum cost of the operational incapacity risk being equal to the current residual value of the vehicle. The research results confirmed the suitability of the integrated risk model for a comparison of vehicle makes and assessment of their reasonably foreseeable life cycle in a balanced carrier-vehicleuser system.

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Systems Engineering: Availability and Reliability

Abstract: Current trends in Industry 4 [...]

Cited by 15 publications

References 16 publications

Composite Lamina Model Design with the Use of Heuristic Optimization

Composite Lamina Model Design with the Use of Heuristic Optimization

Steam Distillation for Essential Oil Extraction: An Evaluation of Technological Advances Based on an Analysis of Patent Documents

Operational risk assessment model for city buses

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