scholarly journals Analysis of vibration resistance of machining technological equipment of a floating workshop in shipbuilding

2021 ◽  
pp. 15-22
Author(s):  
О.В. Владецкий ◽  
Е.В. Хекерт ◽  
Е.А. Владецкая ◽  
А.О. Харченко
Keyword(s):  
Machine Tool ◽  
Vibration Isolation ◽  
Vibration Damping ◽  
Sea Waves ◽  
Internal Factors ◽  
Vibration Resistance ◽  
Floating Base ◽  
Analysis And Synthesis ◽  
Isolation Systems

В статье рассмотрены результаты исследований в направлении совершенствования станочного оборудования для высокоточной обработки деталей в условиях плавучих мастерских путем повышения виброустойчивости технологической системы и снижения вредных воздействий от внешней среды (морского волнения) и соседнего работающего оборудования. Проанализированы традиционные виброизолирующие опоры современных станков, которые невозможно использовать на плавучих мастерских по причине потери ими функционирования в условиях качки плавучего основания и горизонтальных смещений под ее воздействием. Разные способы установки обеспечивают различную степень чувствительности станка к колебаниям основания и возмущениям, действующим в станке. Целью работы является изыскание путей повышения эффективности систем виброизоляции станочного оборудования в условиях плавучей мастерской для обеспечения качества обрабатываемых деталей. Задачей является анализ традиционных виброизолирующих устройств и разработка модели и алгоритма поиска новых структурных вариантов виброизолирующих устройств для уменьшения влияния вибрационных воздействий от внешней среды и внутренних факторов на качество обработки. Выявлено, что на этапах анализа и синтеза на уровне структурно-компоновочной оптимизации виброизолирующих устройств возможно по укрупненным качественным показателям получение рациональных структурных вариантов для шлифовальных станков плавучей мастерской. Установлено, что путем параметрического синтеза и проведения дополнительных теоретических и практических исследований реальных конструкций виброизолирующих устройств, возможно создание новых конструкций виброизолирующего устройства механообрабатывающего технологического оборудования. The article discusses the results of research in the direction of improving machine tool equipment for high-precision machining of parts in floating workshops by increasing the vibration resistance of the technological system and reducing the harmful effects of the environment (sea waves) and neighboring operating equipment. The traditional vibration-isolating supports of modern machines, which cannot be used in floating workshops, due to their loss of functioning under the conditions of the floating base swinging and horizontal displacements under its influence, are analyzed. Different installation methods provide different degrees of machine sensitivity to base vibrations and disturbances in the machine. The aim of the work is to find ways to improve the efficiency of vibration isolation systems for machine tool equipment in a floating workshop to ensure the quality of processed parts. The task is to analyze traditional vibration damping devices and develop a model and an algorithm for searching for new structural variants of vibration damping devices to reduce the influence of vibration effects from the external environment and internal factors on the quality of processing. It was revealed that at the stages of analysis and synthesis at the level of structural and layout optimization of vibration isolation devices, it is possible to obtain rational structural options for grinding machines of a floating workshop based on enlarged quality indicators. It has been established that by means of parametric synthesis and additional theoretical and practical research of real designs of vibration-isolating devices, it is possible to create new designs of vibration-isolating devices of mechanical processing equipment.

IMPROVEMENT OF MACHINE EQUIPMENT FOR PRECISION PROCESSING OF PARTS IN FLOATING WORKSHOPS

2020 ◽  
Vol 3 ◽  
pp. 31-38
Author(s):  
A.O. KHARCHENKO ◽  
S.M. BRATAN ◽  
E.A. VLADETSKAYA
Keyword(s):  
Vibration Isolation ◽  
Precision Machining ◽  
Sea Waves ◽  
Machine Vibration ◽  
Vibration Resistance ◽  
Floating Base ◽  
Active Vibration ◽  
Precision Machine Tools ◽  
Effective Design ◽  
Harmful Effects

The article discusses the results of research and development in the direction of improving machine equipment for precision machining of parts in the conditions of floating workshops by increasing the vibration resistance of the technological system and reducing the harmful effects of the external environment (sea waves) and neighboring operating equipment The traditional vibration–isolating supports of the machines cannot be used at floating workshops due to their loss of functioning under the rolling pitch of the floating base and horizontal displacements under its influence. New effective design variants of the vibration protection device of precision machine tools and supports with active vibration isolation are described, which allow automatic control of the damping of the machine vibration–isolating support under external influences.

scholarly journals Systematic review of research relating to heavy-duty machine tool foundation systems

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401880610 ◽  
Author(s):  
Yang Tian ◽  
Zhifeng Liu ◽  
Xinpeng Xu ◽  
Guang Wang ◽  
Qiwei Li ◽  
...  
Keyword(s):  
Systematic Review ◽  
Machine Tool ◽  
Influencing Factors ◽  
Vibration Isolation ◽  
Relevant Literature ◽  
Quality Inspection ◽  
Heavy Duty ◽  
Operating Life ◽  
Heavy Machine

The quality of heavy-duty machine tool foundations can drastically affect the operating life and working precision of the tool, and the high cost of manufacture has drawn a lot of attention. This article summarized the research status of the relevant literature on the characteristics, vibration isolation, foundation optimization, and quality inspection of heavy-duty machine tool-foundation system, induced the influencing laws of the influencing factors of the system, reviewed the highlights and achievements in the research of heavy machine tool-foundation system at present, and put forward some problems and development directions existing in the research of heavy machine tool-foundation system. It lays a foundation for realizing the judgment of the concrete foundation quality and improving the processing precision and the maintenance of the heavy machine tool.

Viscoelastic Materials With Magnetically-Controllable Properties for Vibration Damping and Isolation

2007 ◽  
Author(s):  
Daniel E. Bruch ◽  
William P. Morey ◽  
Eric H. Anderson
Keyword(s):  
Magnetic Field ◽  
Vibration Isolation ◽  
Research Effort ◽  
Dynamic Performance ◽  
Volume Ratio ◽  
Vibration Damping ◽  
Viscoelastic Materials ◽  
Magnetic Components ◽  
Material Heating ◽  
Isolation Systems

Viscoelastic Materials (VEMs) are in widespread use for vibration damping and isolation. Magnetorheological (MR) fluid devices are also increasingly used for vibration control. MR fluids are suspensions of metal particles in various carrier fluids that have properties controllable by imposition of a magnetic field, using mechanisms that suggest analogous manipulation of properties in more solid carrier or base materials. This paper describes a research effort that studied the properties of composite or compound materials that we call MR-VEM. Compared to traditional VEM, the material offers the opportunity to change properties — at a minimum, the stiffness, and to a lesser extent material damping — by application of magnetic fields. Properties can be manipulated with a DC or AC field. Magnetic design studies for MR-VEM compounds are described. The paper focuses on the experimental characterization of dynamic performance of MR-VEM devices for use in vibration isolation systems. Two properties were used as the basis for distinguishing samples: particle fill factor, that is the volume ratio of MR particles to the base VEM, and the magnitude of magnetic field applied while curing the MR-VEM elements. Applied magnetic field was also varied during testing. The compound material performance is studied through a range of experiments. Test data showing a factor of five stiffness adjustability are presented. Limitations imposed by the size of required magnetic components and by material heating are quantified and discussed. Overall, the material shows promise for applications requiring adjustability in effective stiffness. The paper concludes by considering actuation with the materials.

Strategic threats to energy security as risks of quality of people's life

2020 ◽  
Vol 16 (4) ◽  
pp. 730-744
Author(s):  
V.I. Loktionov
Keyword(s):  
Quality Of Life ◽  
Energy Security ◽  
Well Being ◽  
Scientific Methods ◽  
Analysis And Synthesis ◽  
General Scientific ◽  
And Performance ◽  
Economic Well Being ◽  
The Way

Subject. The article reviews the way strategic threats to energy security influence the quality of people's life. Objectives. The study unfolds the theory of analyzing strategic threats to energy security by covering the matter of quality of people's life. Methods. To analyze the way strategic threats to energy security spread across cross-sectoral commodity and production chains and influences quality of people's living, I applied the factor analysis and general scientific methods of analysis and synthesis. Results. I suggest interpreting strategic threats to energy security as risks of people's quality of life due to a reduction in the volume of energy supply. I identified mechanisms reflecting how the fuel and energy complex and its development influence the quality of people's life. The article sets out the method to assess such quality-of-life risks arising from strategic threats to energy security. Conclusions and Relevance. In the current geopolitical situation, strategic threats to energy security cause long-standing adverse consequences for the quality of people's life. If strategic threats to energy security are further construed as risk of quality of people's life, this will facilitate the preparation and performance of a more effective governmental policy on energy, which will subsequently raise the economic well-being of people.

STRATEGI MENINGKATKAN LOYALITAS KONSUMEN MAKANAN KHAS KOTA CURUP KABUPATEN REJANG LEBONG

2019 ◽  
Author(s):  
Onsardi Onsardi
Keyword(s):  
Swot Analysis ◽  
Raw Materials ◽  
External Factors ◽  
Consumer Loyalty ◽  
Internal Factors ◽  
The Public ◽  
Typical Food ◽  
Internal And External Factors

The title of this study is the Strategy of Increasing Consumer Food Loyalty in CurupCity, Rejang Lebong Regency (Case Study in "Henvian" Typical Food Industry). Thisresearch is based on the importance of strategies in increasing business and consumerloyalty to products sold.Strategies to increase business and consumer loyalty can bedone with a SWOT analysis. Place of this research is the "Henvian" shop that sellstypical Rejang lebong food. The method used in this study is descriptive qualitative.Informants in this study were people who were considered to know for certain about theHENVIAN Specialty Food Store in Curup City, Rejang Lebong Regency. The dataanalysis technique used in this study is a SWOT analysis to determine the strengths,weaknesses, opportunities and threats in a typical Rejang Lebong food business.By using SWOT analysis techniques that consist of strengths (weakness), weaknesses(weakness), opportunities (opportnity) and threats (threath). The results of this studycan be concluded that the internal factors that are the strength of the marketing strategyare the quality of the product that is good at a price affordable to the public andtourists, service that is friendly and responsive to consumer needs, as well astechnological advancements that facilitate the promotion of business. Internal factorsthat are a weakness are often lack of stock, there are some products that do not meet thestandard packaging, the product shelf life is short, employees do not use uniforms.External factors that become opportunities are a fairly high economic community,abundant raw materials while external factors that are a threat are the manycompetitors, an unstable economy, the price of basic needs increases. Based on theresults of the SWOT analysis of internal and external factors, the strategy used is toimprove product quality by improving the appearance of packaging and quality ofcontent and quality of service by providing uniforms to employees and providingstandards of service to consumers. .Keywords: Strategy, Consumer Loyalty, SWOT

La Formación Continua y el Desarrollo de Competencias en los Docentes en Ejercicio del Nivel Secundario

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Leonor Alexandra Rodríguez Álava
Keyword(s):  
Teaching Practice ◽  
Training And Development ◽  
Middle Level ◽  
Teaching Skills ◽  
Practicing Teachers ◽  
Active Subject ◽  
Continuous Preparation ◽  
Analysis And Synthesis ◽  
The Ideal

Este artículo está encaminado a caracterizar el proceso de formación continua del docente del nivel medio en ejercicio asociado a la formación y desarrollo de sus competencias docentes, para lo que fueron utilizados métodos como   el análisis y síntesis, inducción y deducción, abstracción y concreción, la entrevista, la encuesta y  el cuestionario, donde a partir de sus resultados se  llega a la consideración de que la formación continua es la vía idónea para la formación y desarrollo de competencias docentes en los profesores en ejercicio, donde se debe asumir un modelo que propicie la reflexión sobre la propia práctica del docente, un clima de colaboración   y el profesor como sujeto activo de ese proceso.   Palabras claves: calidad educativa,   competencias docentes,   educador, estudio, preparación continua,  ABSTRACT   This article aims to characterize the process of education for teachers of middle level associated with exercise training and development of their teaching skills, for which methods were used as analysis and synthesis, induction and deduction, abstraction and concreteness, interview and questionnaire survey, where from their results leads to the consideration that the training is the ideal way for the formation and development of teaching skills in practicing teachers, where they must assume a model that encourages reflection on own teaching practice, a climate of collaboration and the teacher as an active subject of that process Keywords: quality of education, teaching skills, teacher, study, continuous preparation

Design and analysis of a vibration isolation system with cam–roller–spring–rod mechanism

2021 ◽  
pp. 107754632110005
Author(s):  
Yonglei Zhang ◽  
Guo Wei ◽  
Hao Wen ◽  
Dongping Jin ◽  
Haiyan Hu
Keyword(s):  
Vibration Isolation ◽  
Dynamic Stiffness ◽  
Experimental Studies ◽  
Excitation Amplitude ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Stiffness Characteristic ◽  
Negative Stiffness Mechanism ◽  
Isolation Systems ◽  
Vibration Isolation Performance

The vibration isolation system using a pair of oblique springs or a spring-rod mechanism as a negative stiffness mechanism exhibits a high-static low-dynamic stiffness characteristic and a nonlinear jump phenomenon when the system damping is light and the excitation amplitude is large. It is possible to remove the jump via adjusting the end trajectories of the above springs or rods. To realize this idea, the article presents a vibration isolation system with a cam–roller–spring–rod mechanism and gives the detailed numerical and experimental studies on the effects of the above mechanism on the vibration isolation performance. The comparative studies demonstrate that the vibration isolation system proposed works well and outperforms some other vibration isolation systems.

scholarly journals Stationary Traffic as a Factor of Tourist Destination Quality and Sustainability

2021 ◽  
Vol 13 (7) ◽  
pp. 3965
Author(s):  
Robert Maršanic ◽  
Edna Mrnjavac ◽  
Drago Pupavac ◽  
Ljudevit Krpan
Keyword(s):  
Synthesis Method ◽  
Hotel Industry ◽  
Point Of View ◽  
Tourist Destination ◽  
Scientific Methods ◽  
Tourist Destinations ◽  
Analysis And Synthesis ◽  
The Republic ◽  
Method Analysis

Since the Republic of Croatia is one of the most popular European and world tourist destinations, the aim of this paper is, from the user’s (n = 596) point of view, to research the importance of stationary traffic in tourist destinations. The purpose of this paper is to point out the possibilities of improving the tourist destination quality and sustainability through an adequate parking service. In order to corroborate constructed scientific hypotheses, a larger number of scientific methods were used from which a polling method, analysis and synthesis method, descriptive statistics method, t-test, and analysis of variance (ANOVA) should be singled out. The major finding of this paper indicates a relatively big importance of stationary traffic (M = 6.51; SD = 2.21) as an element of tourist destination quality. Moreover, regarding the quality of tourist destination, the results of this paper suggest that the parking space availability is more important than the way parking or parking payment are organized. Between the experienced parking problem in a tourist destination and age on one side and evaluation of the importance of stationary traffic as an element of tourist destination quality on the other side, a statistically important connection was established. Gained knowledge can be particularly helpful to hotel industry managers but also to traffic managers whose duty is to provide an adequate number of parking spaces in tourist destinations.

Engine Mount Optimization for Vibration Isolation in Motorcycles

2006 ◽  
Author(s):  
Sudhir Kaul ◽  
Anoop K. Dhingra ◽  
Timothy G. Hunter
Keyword(s):  
Optimization Problem ◽  
Vibration Isolation ◽  
Total Force ◽  
Engine Mounts ◽  
The Road ◽  
Design Variables ◽  
Swing Arm ◽  
Engine Mount ◽  
Six Degree Of Freedom

This paper presents a comprehensive model to capture the dynamics of a motorcycle system in order to evaluate the quality of vibration isolation. The two main structural components in the motorcycle assembly - the frame and the swing-arm - are modeled using reduced order finite element models; the power-train assembly is modeled as a six degree-of-freedom (DOF) rigid body connected to the frame through the engine mounts and to the swing-arm through a shaft assembly. The engine mounts are modeled as tri-axial spring-damper systems. Models of the front-end assembly as well as front and rear tires are also included in the overall model. The complete vehicle model is used to solve the engine mount optimization problem so as to minimize the total force transmitted to the frame while meeting packaging and other side constraints. The mount system parameters - stiffness, position and orientation vectors - are used as design variables for the optimization problem. The imposed loads include forces and moments due to engine imbalance as well as loads transmitted due to irregularities in the road surface through the tire patch.

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