Robust genetically optimized skew laminates

2018 ◽  
Vol 233 (1) ◽  
pp. 146-159 ◽  
Author(s):  
Kanak Kalita ◽  
Partha Dey ◽  
Salil Haldar
Keyword(s):  
Genetic Algorithm ◽  
Boundary Conditions ◽  
Optimization Algorithm ◽  
Research Work ◽  
Extensive Study ◽  
Stacking Sequence ◽  
Different Boundary Conditions ◽  
Fundamental Frequencies ◽  
Wide Range ◽  
Safe Limit

The present research work explores genetically optimized skew laminates, whose stacking sequence has been varied to maximize their fundamental frequencies with the help of an efficient optimization algorithm. Genetic algorithm, rather than being applied blindly with empirical parameters, is tuned with respect to the problem at hand. Following an extensive study, genetic algorithm parameters are selected carefully so as to ensure a robust optimized stacking sequence. The sensitivity of ply angles is also investigated so as to warrant against marginal manufacturing perturbations. The safe limit for variation of ply angles without much hampering the frequency is also recommended. Validation with existing solutions illustrates the efficiency of the procedure. A wide range of results with rectangular/ skew plates of different layers having symmetric/ antisymmetric ply-orientations, subject to different boundary conditions are solved, which demonstrate the efficacy of the approach.

New Approach for Versatile Self Piercing Riveting: Joining System and Auxiliary Part

2021 ◽  
Vol 883 ◽  
pp. 3-10
Author(s):  
Fabian Kappe ◽  
Mathias Bobbert ◽  
Gerson Meschut
Keyword(s):  
Boundary Conditions ◽  
Research Work ◽  
High Load ◽  
Continuous Increase ◽  
New Approach ◽  
Load Bearing ◽  
Mechanical Joining ◽  
Wide Range ◽  
Riveting Process

The increasing use of multi-material constructions lead to a continuous increase in the use of mechanical joining techniques due to the wide range of joining possibilities as well as the high load-bearing capacities of the joints. Nevertheless, the currently rigid tool systems are not able to react to changing boundary conditions, like changing the material-geometry-combination. Therefore research work is crucial with regard to versatile joining systems. In this paper, a new approach for a versatile self-piercing riveting process considering the joining system as well as the auxiliary joining part is presented.

scholarly journals Ply stacking sequence optimization of composite driveshaft using particle swarm optimization algorithm

2014 ◽  
Vol 5 ◽  
pp. A16 ◽  
Author(s):  
K. Manjunath ◽  
T. Rangaswamy
Keyword(s):  
Genetic Algorithm ◽  
Particle Swarm Optimization ◽  
Optimization Algorithm ◽  
Particle Swarm Optimization Algorithm ◽  
Epoxy Composite ◽  
Particle Swarm ◽  
Stacking Sequence ◽  
Swarm Optimization ◽  
Stacking Sequence Optimization ◽  
Single Piece

In this paper an attempt has been made to optimize ply stacking sequence of single piece E-Glass/Epoxy, HM Carbon/Epoxy and Boron/Epoxy composite drive shafts using particle swarm optimization (PSOA). PSOA programme is developed using MATLAB V 7 to optimize the ply stacking sequence with an objective of weight minimization. The weight savings of the E-Glass/Epoxy, HM Carbon/Epoxy and Boron/Epoxy shaft are 51%, 87% and 85% of the steel shaft respectively. The optimum results of PSOA obtained are compared with results of genetic algorithm (GA) and found that PSOA yields better results than GA.

Hybrid fuzzy-genetic algorithm to automated discovery of prediction rules

2021 ◽  
Vol 40 (1) ◽  
pp. 43-52
Author(s):  
Ibrahim A. Fadel ◽  
Hussein Alsanabani ◽  
Cemil Öz ◽  
Tariq Kamal ◽  
Murat İskefiyeli ◽  
...  
Keyword(s):  
Data Mining ◽  
Genetic Algorithm ◽  
Fuzzy Logic ◽  
Research Work ◽  
Prediction Rules ◽  
Wide Range ◽  
Fuzzy Genetic Algorithm ◽  
Automated Discovery ◽  
Fuzzy Genetic ◽  
Crossover And Mutation

Genetic algorithm is one of data mining classification techniques and it has been applied successfully in a wide range of applications. However, the performance of Genetic algorithm fluctuates significantly. This research work combines Genetic algorithm with fuzzy logic to adapt dynamically crossover and mutation parameters of Genetic algorithm. Two different datasets are taken during the experiment. Several experiments have been performed to prove the effectiveness of the proposed algorithm. Results show that the rules generated from a proposed algorithm are significantly better with high fitness and more efficient as compared to a normal Genetic algorithm.

Review of Studies of Dagestan Arabic-Language Sources of the Post-Soviet Period

2021 ◽  
pp. 239
Author(s):  
Ramazan S. Abdulmazhidov
Keyword(s):  
Research Work ◽  
Arabic Language ◽  
Extensive Study ◽  
Soviet Period ◽  
North Caucasus ◽  
Important Place ◽  
Wide Range ◽  
History Of ◽  
Academy Of Sciences ◽  
Post Soviet Period

Materials in the Arabic language, mainly concentrated in Dagestan, occupy the most important place among the sources on the history of the North Caucasus. Its research has started since the 19th century. The academic study of these sources continued with the establishment of the Center of Oriental Manuscripts in 1963 in Makhachkala at the Institute of Language, History and Literature of Dagestan branch of the USSR Academy of Sciences. In the post-Soviet period, Russian orientalists drew attention to a number of still insufficiently studied Arabic-language sources. The research work revealed more new sources that significantly changed established ideas about social, legal and military-political history of Dagestan. Extensive study and translations of several historical chronicles, a wide range of various sources from the period of the Caucasian War were introduced into scientific circulation. Systematic work is underway to study the epistolary sources kept both in the Fund of Oriental Manuscripts of the Institute of History, Archeology and Ethnography of the Russian Academy of Sciences in Makhachkala (it includes now thousands of manuscripts and documents) and in numerous private manuscript collections. Studies of Arabic-language written monuments often remain out of sight not only for a wide range of readers, but also for the historians who specialize on the history of the Caucasus. This article devoted to their review and analysis is intended to fill this gap; it summarizes a certain result of enduring research work directed to the study of these manuscripts, carried out in the post-Soviet period.

scholarly journals Biodynamic Response of Femur Bone

2020 ◽  
Vol 9 (5) ◽  
pp. 1406-1412
Keyword(s):  
Boundary Conditions ◽  
Research Work ◽  
Mode Shapes ◽  
Future Research ◽  
Strength Analysis ◽  
Different Boundary Conditions ◽  
Femur Bone ◽  
Surgical Implants ◽  
Research Problems ◽  
Fracture Study

The main objective of this paper is to study the development of research work performed for femur bone. A broad literature survey from 1980 to 2019 was studied. It was observed that researcher had performed modal analysis, strength analysis and fracture study of femur bone in previous study. The natural frequencies were determined and different mode shapes were studied. The bone materials and different boundary conditions of previous study were noted and future research problems was identified. In conclusion from previous studies it was noted that there is lot of scope to perform study on femur bone. These studies will be related to fracture identification, healing of femur bone and advanced strength analysis for varying bone size using different boundary conditions. For surgical implants few new materials are identified that can be used for future study.

Experimental Investigation of the Influence of Stacking Sequence and Delamination Size on the Natural Frequencies of Delaminated Composite Plate

2021 ◽  
Vol 64 (1) ◽  
pp. 76-83
Author(s):  
Muhammad Imran ◽  
Rafiullah Khan ◽  
Saeed Badshah
Keyword(s):  
Carbon Fiber ◽  
Boundary Conditions ◽  
Composite Plate ◽  
Natural Frequencies ◽  
Research Work ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Stacking Sequence ◽  
Simply Supported ◽  
Reinforced Polymer

The vibration properties of the composite structures is critical to the reliability and durability of the structures. Vibration becomes worst in case the delamination is present within laminates. In this research work, experimental, finite element and analytical techniques have been applied in order to analyze the influence of stacking sequence and delamination sizes on the natural frequencies of carbon fiber reinforced polymer composite (CFRP) plate with and without delamination. The boundary conditions in this research work was (SSSS) (all sides simply supported. Experiments were performed to study the vibration characteristics of (CFRP) delaminated composite plate. Software package ABQUS was used to model and analyze the vibration response of carbon fiber reinforced polymer composite plate for (SSSS) boundary condition and the effect of stacking sequence and delamination size was calculated. Rayleigh- Ritz Method was used to find the natural frequencies for different delamination sizes and stacking sequences. The results was concluded that natural frequencies were significantly affected by the delamination sizes and stacking sequences. Stacking sequence of (0/90/45/90) showed higher values of natural frequencies in lower mode subjected to all-sides simply supported boundary conditions. It was interesting to see that there were small differences in values of natural frequencies among the stacking sequences for lower modes but the difference gradually increased in case of higher modes.    

Justification of the need to improve the legal, regulatory and methodological framework for the spread of parasitic infections in the provision of medical care

2020 ◽  
Vol 99 (5) ◽  
pp. 493-497
Author(s):  
M. M. Aslanova ◽  
T. V. Gololobova ◽  
K. Yu. Kuznetsova ◽  
Tamari R. Maniya ◽  
D. V. Rakitina ◽  
...  
Keyword(s):  
Medical Care ◽  
Research Work ◽  
Hospital Environment ◽  
Parasitic Infections ◽  
Infusion Therapy ◽  
Methodological Framework ◽  
Production Environment ◽  
Medical Institutions ◽  
Medical Network ◽  
Wide Range

Introduction. The purpose of our work was to justify the need to improve the legislative, regulatory and methodological framework and preventative measures in relation to the spread of parasitic infections in the provision of medical care. There is a wide range of pathogens of parasitic infestations that are transmitted to humans through various medical manipulations and interventions carried out in various medical institutions. Contaminated care items and furnishings, medical instruments and equipment, solutions for infusion therapy, medical personnel’s clothing and hands, reusable medical products, drinking water, bedding, suture and dressing materials can serve as a major factor in the spread of parasitic infections in the provision of medical care. Purpose of research is the study of the structure and SMP of parasitic origin, circulating on the objects of the production environment in multi-profile medical and preventive institutions of stationary type in order to prevent the occurrence of their spread within medical institutions. Material and methods. The material for the study was flushes taken from the production environment in 3 multi-profile treatment and prevention institutions of inpatient type: a multi-specialty hospital, a maternity hospital and a hospital specializing in the treatment of patients with intestinal diseases for the eggs of worms and cysts of pathogenic protozoa. Results. During the 2-year monitoring of medical preventive institutions, a landscape of parasitic contamination was found to be obtained from the flushes taken from the production environment objects in the premises surveyed as part of the research work. Discussions. In the course of research, the risk of developing ISMP of parasitic origin was found to be determined by the degree of epidemiological safety of the hospital environment, the number and invasiveness of treatment and diagnostic manipulations and various medical technologies. Conclusion. It is necessary to conduct an expert assessment of regulatory and methodological documents in the field of epidemiological surveillance and sanitary and hygienic measures for the prevention of medical aid related infections of parasitic origin, to optimize the regulatory and methodological base, to develop a number of preventive measures aimed at stopping the spread of parasitic infections in the medical network.

On the Margins of Modernism

2017 ◽  
Author(s):  
Christopher Rosenmeier
Keyword(s):  
Short Stories ◽  
Detailed Analysis ◽  
Chinese Literature ◽  
Popular Literature ◽  
Extensive Study ◽  
Wide Range ◽  
Chinese Fiction ◽  
Scant Attention ◽  
Narrative Techniques ◽  
Chinese Writing

Xu Xu and Wumingshi were among the most widely read authors in China during and after the Second Sino-Japanese War (1937–1945). Despite being an integral part of the Chinese literary scene, their bestselling fiction has, however, been given scant attention in histories of Chinese writing. This book is the first extensive study of Xu Xu and Wumingshi in English or any other Western language and it re-establishes their importance within the popular Chinese literature of the 1940s. Their romantic novels and short stories were often set abroad and featured a wide range of stereotypes, from pirates, spies and patriotic soldiers to ghosts, spirits and exotic women who confounded the mostly cosmopolitan male protagonists. Christopher Rosenmeier’s detailed analysis of these popular novels and short stories shows that such romances broke new ground by incorporating and adapting narrative techniques and themes from the Shanghai modernist writers of the 1930s, notably Shi Zhecun and Mu Shiying. The study thereby contests the view that modernism had little lasting impact on Chinese fiction, and it demonstrates that the popular literature of the 1940s was more innovative than usually imagined, with authors, such as those studied here, successfully crossing the boundaries between the popular and the elite, as well as between romanticism and modernism, in their bestselling works.

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