A fuzzy method for selecting underground coal mining method considering mechanization criteria

Zeng

et al. 2022

Shock and Vibration

In order to comprehensively analyze the adaptability of four-leg hydraulic support with large mining height under impact dynamic load, this paper adopts HyperMesh software to conduct a flexible pretreatment for the top beam, shield beam, and front and rear rods. The numerical simulation model of four-leg hydraulic support is established with ADAMS, where variable stiffness spring is used to replace columns to simulate their elastic characteristics. Building on analysis of the specific parameters of the support, this paper attempts to study the adaptability of the hydraulic support with impact dynamic load acting on the top beam. Additionally, the impact coefficient I and the excitation coefficient E have been introduced to transform the analysis results and optimize the evaluation method of the response degree of the top beam under impact load. Consequently, the response characteristics of the columns and pins at the hinged joints under various coupling states of the surrounding rock are found. Meanwhile, the paper has made a detailed comparison on the stress state of hydraulic support with different impact loads acting on the top beam. The adaptability change rule of the impact dynamic load under various impact conditions has been explored, which is of great significance to the optimization and strength design of four-leg hydraulic support with large mining height.

Section: Introductionmentioning

confidence: 99%

Adaptability Analysis of Four-Leg Hydraulic Support with Large Mining Height under Impact Dynamic Load

Zeng

et al. 2022

Shock and Vibration

“…Per steps f and g, Tables 10 and 11 show the ultimate scores of the five alternatives in the form of fuzzy numbers, obtained by adding the fuzzy numbers-elements of the fuzzy performance matrix, according to Equation (11). Then the ultimate weights of the alternatives are shown in the form of non-fuzzy numbers, after defuzzification employing Equation (12). The final ranking of the alternatives is based on the sensitivity analysis per Equation (13).…”

Section: Resultsmentioning

confidence: 99%

Application of Fuzzy Analytic Hierarchy Process to Underground Mining Method Selection

Bajić

Gluščević

et al. 2020

Symmetry

The paper proposes a problem-solving approach in the area of underground mining, related to the evaluation and selection of the optimal mining method, employing fuzzy multiple-criteria optimization. The application of fuzzy logic to decision-making in multiple-criteria optimization is particularly useful in cases where not enough information is available about a given system, and where expert knowledge and experience are an important aspect. With a straightforward objective, multiple-criteria decision-making is used to rank various mining methods relative to a set of criteria and to select the optimal solution. The considered mining methods represent possible alternatives. In addition, various criteria and subcriteria that influence the selection of the best available solution are defined and analyzed. The final decision concerning the selection of the optimal mining method is made based on mathematical optimization calculations. The paper demonstrates the proposed approach as applied in a case study.

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

“…Bulanık önceliklendirme metodu Mikhailov ve Tsvetinov tarafından geliştirilmiştir ve alternatif hizmet sağlayıcıların değerlendirilmesinde [24], yeraltı mekanizasyon yöntemlerinin madende uygulanıp uygulanamayacağının değerlendirilmesinde [25], maden ocağında oluşabilecek tehlike ve riskleri önlemek amacıyla gerçekleştirilen FMEA (hata türleri ve etkileri analizi) çalışmasında [23], üniversite hastanesinde görev yapan hekimler üzerinde algılanan zihinsel iş yüklerinin değerlendirilebilmesinde [15] kullanılmıştır.…”

Section: Bulanık öNceliklendirme Metodu (Böm)unclassified

Tekrarlanan işlerde algılanan zihinsel iş yükü

Ocaktan

Karaoğlan

Akça

et al. 2021

The weight of the work done during the day, and the repetition and continuity, force the employees and may cause musculoskeletal disorders in time. In the industry, studies generally are carried out in order to prevent the physical effects of the work. However, the work done has physical effects as well as mental effects to the employees. Improvements are needed to reduce both physical and mental workloads are required to prevent performance and efficiency losses that may occur. In this study, the working postures and mental workload of the operators during the stator sheet cutting process used in alternator production were examined. Alternator production process is one of the labor intensive works. In the stator sheet cutting process, when the working stance is evaluated, it is thought that the employee is not having too much physical difficulty. Although it is thought that the working posture is ergonomically appropriate, it is thought that continuous repetition of work during the day may have physical effects on the employee, as well as mental effects such as boredom, unwillingness and low motivation of work. NASA-TLX method was used to evaluate the mental workload of the work done in the employee. NASA-TLX method was used to evaluate the mental workload of the job done in the employee. The method involves a binary comparison process in determining the importance weights. Fuzzy prioritization method has been used to obtain more realistic results since uncertainties are involved in this process. The evaluations of a team composed of two academicians and two production managers were used to determine the importance weights obtained as a result of the pairwise comparison of mental workload dimensions. Thus, more objective results have been revealed.