scholarly journals Generic methodology for modeling and simulation of vibration, wear and noise in electromechanical drivetrains

2021 ◽  
Author(s):  
◽  
Yashwant Kolluru

This work describes development of a comprehensive methodology for analyzing vibro-acoustic and wear mechanisms in transmission systems. The thesis addresses certain gaps present in the fields of structure dynamics and abrasion mechanism and opens new areas for further research. The paper attempts to understand new and relatively unexplored challenges like influences of wear on the dynamics of drive train. It also focuses on developing new techniques for analyzing the vibration and acoustic behavior of the drive unit structures and surrounding fluids respectively. The developed methodology meets the requirements of both the complete system and component level modeling by using specially identified combination of different simulation techniques. Based on the created template model, a three-stage spur plus helical gearbox is constructed and simulated as an application example. In addition to the internal mechanical excitation mechanisms, the transmission model also includes the rotational and translational dynamics of the gears, shafts and bearings. It is followed by illustration of wear among the rotating components. Different kinds of static and dynamic analyses are performed and coupled at various levels depending on the mechanical complexities involved. Furthermore, the structure dynamic vibration of the housing and the associated sound particle radiations are mapped into the surrounding fluid. Additionally, the approach for selection of the potential parameters for optimization is depicted. Final part focuses on the measurements of different system states used for validation of the model. In the end, results obtained from both simulations and experiments are analyzed and assessed for there respective performances.

1982 ◽  
Vol 15 (12) ◽  
pp. 458-463 ◽  
Author(s):  
R. S. Medlock

Flow measurement has a long history extending over a period of about 3000 years, but it was only just over 200 years ago that the subject was first studied on a scientific basis and it was only 20 years ago that a surge of new techniques became available. Today there is a wide selection of methods and equipment to enable flow to be measured whether the medium is in the form of a liquid, gas, vapour or solid, or any combination thereof. According to the application, volumetric flow rate can be measured over a range exceeding 10−5m3/h to 106m3/h which in everday terms is equivalent to a cupful per day to the flow of a very large river. The price of a flowmeter can be as small as a few pounds or in excess of £1 million depending on the accuracy and capacity required. References are made to about 50 types of flow metering devices which can be classified into 11 groups.


2010 ◽  
Vol 88 (2) ◽  
pp. 269-290 ◽  
Author(s):  
Sarah Rauscher ◽  
Régis Pomès

Protein disorder is abundant in proteomes throughout all kingdoms of life and serves many biologically important roles. Disordered states of proteins are challenging to study experimentally due to their structural heterogeneity and tendency to aggregate. Computer simulations, which are not impeded by these properties, have recently emerged as a useful tool to characterize the conformational ensembles of intrinsically disordered proteins. In this review, we provide a survey of computational studies of protein disorder with an emphasis on the interdisciplinary nature of these studies. The application of simulation techniques to the study of disordered states is described in the context of experimental and bioinformatics approaches. Experimental data can be incorporated into simulations, and simulations can provide predictions for experiment. In this way, simulations have been integrated into the existing methodologies for the study of disordered state ensembles. We provide recent examples of simulations of disordered states from the literature and our own work. Throughout the review, we emphasize important predictions and biophysical understanding made possible through the use of simulations. This review is intended as both an overview and a guide for structural biologists and theoretical biophysicists seeking accurate, atomic-level descriptions of disordered state ensembles.


10.12737/781 ◽  
2013 ◽  
Vol 1 (2) ◽  
pp. 21-23 ◽  
Author(s):  
Хейфец ◽  
Aleksandr Kheyfets

The need of descriptive geometry (DG) course reorganization in the direction of reflecting in it the foundations of modern computer 3D geometric simulation techniques is shown. The full rate use of 3D methods calls on students a special theoretical training. New techniques require the knowledge of computer as modern 3D geometric simulation tool. A new theoretical course composed of three modules has been proposed. The basics of 3D are given initially. Then, in accordance with the FSES-3 requirements, the DG elements are given by the example of positional tasks, but they are also underpinned by 3D-methods. The proposed DG course reorganization on the basis of 3D computer geometric simulation will permit to equip the students with new methods of decisions related to graphic tasks, significantly increase their competitiveness on the labor market, as well as to raise the graphics chairs’ rating.


1994 ◽  
Vol 116 (2) ◽  
pp. 268-274 ◽  
Author(s):  
O. P. Gandhi ◽  
V. P. Agrawal

System structure is important for analyzing wear of a system. In this paper, this aspect is considered at the component level and is modeled using digraph and matrix methods. Contributing wear factors and the degree of influence among these factors, which determine wear independence and wear process between mating components, are identified. This along with the wear measure of subsystems determines the system wear. The procedure develops wear functions for characterization and comparison of subsystems of different types. These are also useful for wear analysis and evaluation leading to an optimum selection of subsystems based on the wear. The procedure is also shown to be useful at the operating state of a system and subsystems. Step-by-step procedure for system wear evaluation is presented. Methodology is also demonstrated by an example.


2015 ◽  
Vol 719-720 ◽  
pp. 96-101 ◽  
Author(s):  
Boris Y. Mokritskii ◽  
Dmitriy A. Pustovalov ◽  
Alexey Anatolevich Vereschaka ◽  
Anatoliy Stepanovich Vereschaka ◽  
A.D. Verhoturov

Experimental comparative evaluation of cutting properties of edge tools underspecified operating conditions is undesirable, since it takes a lot of time and expenses. The need for development of simulation techniques is clear, and the above techniques can be the basis for the classification of compared edge cutting tools on their most appropriate features and for the selection of the most rational type of such a tool using a technique of nondestructive testing. The analysis of the studies in the field of evaluation of the cutting tool properties by nondestructive testing techniques as well as our own experience of developing similar techniques suggest that such a technique could be developed on the basis of the pendulum scribing technique. Thus, the objective of this study was to develop procedures for the selection of rational parameters of edge cutting tools for specified machining conditions based on simulating a low-cost process.The study was supported by grant No. 9.251.2014/K, project code 251.


2021 ◽  
Vol 3 (5) ◽  
pp. 2858-2868
Author(s):  
Érica Giaretta Biase ◽  
Flávia Junqueira Da Silva

A pesquisa propõe uma apresentação teórica do processo de formação do Inspetor Escolar a partir da perspectiva democrática da educação. Nessa perspectiva, buscamos compreender as políticas educacionais e identificar os aspectos relevantes para a formação do especialista em inspeção escolar. Nesse sentido, algumas indagações são apresentadas: como tem ocorrido a formação dos especialistas em educação na área da inspeção escolar a partir da perspectiva democrática? Quais são as atribuições do inspetor escolar na gestão democrática? Historicamente, o surgimento do trabalho da inspeção escolar no Brasil iniciou com a vinda dos Jesuítas. A partir daí, mudanças aconteceram no cenário político e educacional no país, o que contribuiu para a democratização do ensino e a busca de um novo perfil deste profissional. Os cursos de graduação em Pedagogia e de pós-graduação lato sensu têm grande responsabilidade na formação deste profissional, no desenvolvimento de um ensino com bases epistemológicas centradas no contexto filosófico, sociológico, político, social, histórico, econômico e cultural. Dessa forma, o estudo teórico, a princípio partiu do levantamento bibliográfico sobre a temática. E, após a seleção do material coletado, utilizou-se das análises textuais e interpretativas das fontes selecionadas. Dessa forma, recorreu-se a vários teóricos e pesquisadores da área como Santos Filho (2006), Veiga (2003), Gadotti (2000), Barbosa (2008), Laval (2019), entre outros. Assim, as instituições educacionais necessitam de profissionais preparados como uma formação acadêmica solidificada para atuarem no processo ensino aprendizagem na construção de uma educação baseada nos princípios da democracia, da inclusão e da formação humana. Portanto, o inspetor escolar deve atuar como gestor educacional estimulando o trabalho em equipe, o diálogo entre os profissionais da educação, a busca por novas técnicas e metodologias de ensino, valorizar as experiências dos envolvidos no processo e integrar a comunidade na solução dos problemas, na busca por um processo construtivo e integrador de ensino.   This research proposes a theoretical presentation on the training process of the school inspector from the democratic perspective of education. From this perspective, we seek to understand the educational policies and identify the relevant aspects for the formation of the school inspection specialist. In this sense, some questions are presented: How has the training of specialists in education in the area of school inspection occurred from the democratic perspective? What are the attributions of the school inspector in democratic management? Historically, the emergence of school inspection in Brazil began with the arrival of the Jesuits. Since then, changes have taken place in the political and educational scenario in the country, which contributed to the democratization of education and the search for a new profile for this professional. The graduate courses in Pedagogy and the lato sensu post-graduate courses have a great responsibility in the formation of this professional, in the development of a teaching with epistemological bases centered on the philosophical, sociological, political, social, historical, economic and cultural context. In this way, the theoretical study started with a bibliographical survey on the theme. And, after the selection of the collected material, we used textual and interpretative analyses of the selected sources. Thus, we resorted to several theorists and researchers in the area such as Santos Filho (2006), Veiga (2003), Gadotti (2000), Barbosa (2008), Laval (2019), among others. Thus, educational institutions need professionals prepared as a solidified academic training to act in the teaching-learning process in the construction of an education based on the principles of democracy, inclusion and human formation. Therefore, the school inspector should act as an educational manager stimulating teamwork, dialogue among education professionals, the search for new techniques and teaching methodologies, valuing the experiences of those involved in the process and integrating the community in the solution of problems, in the search for a constructive and integrating teaching process.  


2014 ◽  
Vol 4 (5) ◽  
pp. 112-118
Author(s):  
Regina Robertovna Halfina ◽  
Maxim Nikolaevich Kislitsyn ◽  
Alexandr Zufarovich Minullin
Keyword(s):  

1991 ◽  
Vol 20 (379) ◽  
Author(s):  
Anders Gammelgaard

<p>In the papers surveyed in this thesis a number of simulation techniques are presented together with their applications to several examples. The papers improve upon existing techniques and introduce new techniques.</p><p> </p><p>The improvement of existing techniques is motivated in programming methodology: It is demonstrated that existing techniques often introduce a double proof burden whereas the improved techniques alleviate such a burden. One application is to ensure delay insensitivity in a class of self-timed circuits.</p><p> </p><p>A major part of the thesis is concerned with the deduction and use of two simulation techniques to prove the correctness of translations from subsets of <strong>occam-2</strong> to transputer code.</p>


Author(s):  
Zhengyi Song ◽  
Young Moon

CyberManufacturing System is an advanced vision for future manufacturing where physical components are fully integrated and seamlessly networked with computational processes, forming an on-demand, intelligent, and communicative manufacturing resource and capability repository with optimal and sustainable manufacturing solutions. The CyberManufacturing System utilizes recent developments in Internet of things, cloud computing, fog computing, service-oriented technologies, among others. Manufacturing resources and capabilities can be encapsulated, registered, and connected to each other directly or through the Internet, thus enabling intelligent behaviors of manufacturing components and systems such as self-awareness, self-prediction, self-optimization, and self-configuration. This research presents an introduction to the CyberManufacturing System, establishing the architecture and functions of the CyberManufacturing System, designing the pivotal control strategy, and investigating the performance analysis of the CyberManufacturing System using modeling and simulation techniques. In total, five component-level examples and one system-level case study have been developed and used for illustration and validation of the CyberManufacturing System operations. The results show that the CyberManufacturing System is superior to other types of manufacturing systems in terms of functionality and cooperative performance.


Author(s):  
Pavol Voza´r ◽  
Vladimi´r Sleza´k ◽  
Kamil Krava´rik

This paper deals with advanced 3D computer-aided technologies used for modelling and simulation for decommissioning purposes. Within the A-1 NPP decommissioning process a set of activities is needed to perform successful dismantling and decontamination of rooms and equipment. Optimal process of performance of D&D of underground storage tanks and auxiliary rooms were used on the base of simulation outputs. The mockup tests were performed before using remotely controlled manipulators. The human presence during decontamination and dismantling is case by case excluded due to the radiation safety and ALARA approach. Within Bohunice A-1 Decommissioning Project an advanced computer-aided technologies were/are developed and used. Modelling software packages EUCLID and 3Dipsos together with 3D-laser scanner SOISIC are used for creating of 3D models and also for the verification of as-built state of selected systems and facilities. Software IGRIP is used for computer simulations of all D&D tasks. The 3D modelling and simulation of selected rooms and technological equipment of the A-1 NPP are used consequently in the process of decommissioning preparation and implementation. 3D modelling for the verification and simulation of operating steps is presented in the paper and its contribution to avoiding of collisions and non-optimal interventions into the building and technological parts during performing particular works is evaluated. The application of 3D models for the verification and simulation of operating steps significantly contribute to the optimal planning of D&D procedures. Minimisation of occupation doses of realisation personnel is main reason why the 3D modelling and simulations are used. The paper also presented 3D models of rooms chosen to simulate specific operations (decontamination, handling of radioactive wastes and/or dismantling by remote controlled manipulators) without risk accident, high dose rates of personnel etc. Process of selection of optimal operating procedure for decontamination and dismantling is presented as well as achieved experiences and recommendations for further work.


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