Method of experimental evaluation of the efficiency coefficient of vibration protection of the rope-rod coupling "MAMSAR+A" of the diesel generator set DGA-8.83

2021 ◽  
pp. 88-95
Author(s):  
М.А. Минасян ◽  
А.М. Минасян ◽  
Ц. Цзэн
Keyword(s):  
Experimental Evaluation ◽  
Vibration Isolation ◽  
Experimental Studies ◽  
Original Method ◽  
Efficiency Coefficient ◽  
Diesel Generator ◽  
Vibration Protection ◽  
Rigid Connection ◽  
Two Stages

Объектом исследования является опытный образец запатентованной канатностержневой муфты (КСМ) «MAMSAR+А» в качестве привода дизель-генераторного агрегата ДГА-8,83 мощностью 9,56 кВт при частоте вращения 1500 мин-1 с дизелем 2Ч 8,5/11 и генератором «ГК-5,6». Целью исследования является экспериментальная оценка коэффициента эффективности вибрационной защиты КСМ. Поставленная цель достигается разработкой и реализацией оригинальной методики экспериментальной оценки коэффициента эффективности КСМ с анализом и выводами результатов экспериментальных исследований. Экспериментальные исследования проводятся в два этапа. Первый этап – с упругим соединением КСМ, второй этап – с жестким соединением. Оригинальность методики экспериментальной оценки коэффициента эффективности вибрационной защиты КСМ главным образом заключается в том, что между двумя этапами экспериментальных исследований КСМ не демонтируется. Следовательно, качество центровки не нарушается. Усредненный коэффициент эффективности виброизоляции КСМ составляет от 3 до 8 дБ. The object of this research is a prototype of the patented wire rope coupling (KSM) "MAMSAR+A" as a drive for a diesel-generator unit DGA-8.83 with a power of 9.56 kW at a speed of 1500 min-1 with a 2CH 8.5/11 diesel engine and a generator "KG-5.6". The aim of the research is to experimentally evaluate the efficiency coefficient of vibration protection of the KSM. This goal is achieved by developing and implementing an original method for experimental evaluation the efficiency coefficient of the KSM with analysis and conclusions of the results of experimental studies. Experimental studies are conducted in two stages. The first stage - with an elastic connection of the coupling, the second stage - with a rigid connection. The originality of the method of experimental evaluation of the efficiency coefficient of vibration protection of the KSM mainly lies in the fact that the KSM is not dismantled between the two stages of experimental research. Therefore, the quality of alignment is not violated. The average coefficient of vibration isolation efficiency of the KSM is from 3 to 8 dB.

scholarly journals STUDY OF THE EFFECTIVENESS OF VIBRATION ISOLATION OF UNCONVENTIONAL TOROIDAL ROPE VIBRATION ISOLATORS IN DIESEL UNITS VIBRATION ISOLATION SYSTEM

Akustika ◽  
2019 ◽  
Vol 32 ◽  
pp. 110-114
Author(s):  
Minas Minasyan ◽  
Armen Minasyan ◽  
Aung Thant
Keyword(s):  
Power Plants ◽  
Vibration Isolation ◽  
Steel Wire ◽  
Experimental Studies ◽  
Wire Rope ◽  
Diesel Generator ◽  
Isolation System ◽  
Vibration Isolators ◽  
Before And After ◽  
Materials Used

The paper notes that the structure of the wire rope is one of the most suitable materials used as a fire-resistant elastic element of vibration-insulating structures and fasteners (vibration isolators). To solve the problems of vibration isolation of marine diesel power plants in the framework of development and improvement of the shock absorption system, the original patented elastic supports with elastic elements made of steel wire rope in the form of a torus are presented. When commercially available vibration isolators do not meet the relevant requirements of vibration protection of a particular object, the solution to the existing problem can be achieved by using the proposed wire rope vibration isolators. The technical results of the original patented inventions are: - equal stiffness in the horizontal plane - ensuring the reliability and high vibration efficiency of protection against impacts and shocks. The proposed designs of vibration isolators are easy (technological in manufacturing) to manufacture and assemble, reliable and durable - the service life is 10 years or more. Vibration efficiency is confirmed by the vibration acceleration spectra before and after the vibration isolator of the damping system of the ship diesel-generator DGA-500 and the diesel unit with a 2H 8.5/11 engine and water brake on a common sub-frame. The three-year trial life of the DGA-500 and experimental studies on a diesel unit with a 2H 8.5/11 engine and water brake on a common sub-frame confirms their efficiency and effectiveness.

scholarly journals Research of efficiency of lignite chemical modification and steam-gas activation combining for sorbents preparation*

2020 ◽  
Vol 192 ◽  
pp. 02025
Author(s):  
Elena Vorsina ◽  
Tatiana Moskalenko ◽  
Valery Mikheev ◽  
Mehmet Bilen
Keyword(s):  
Chemical Modification ◽  
Chemical Activation ◽  
Experimental Studies ◽  
Optimal Parameters ◽  
Adsorption Activity ◽  
Iodine Adsorption ◽  
Two Stages ◽  
Parallel Action ◽  
Sorption Characteristics

The paper presents the results of research for sorbents preparation when combining the processes of chemical modification and steam-gas activation of lignite from the Kharanorsk deposit (Zabaikalsky Krai). The experimental studies were carried out by two ways of activation methods combination: parallel and successive exposure on feedstock. The lignite processed by chemical reagent (KOH) was exposed to steam during the whole period of thermolysis under the parallel action. Under successive exposure, the thermolysis was performed in two stages - first without steam supply, then with steam-gas activation. In the work the optimal parameters of the process of combining the chemical and steam-gas lignite activation methods were determined and the quality of the generated sorbents was studied. The efficiency of combined activation was estimated by comparing the sorption characteristics of the samples with the results obtained during chemical and steam-gas activation as autonomous processes and with the requirements to these characteristics of industrially produced active carbon grades. Combined activation of lignite allowed to increase the value of iodine adsorption activity in comparison with autonomous steam-gas activation by 1.8-2 times, chemical activation - by 2.7-10 %. The obtained values of iodine adsorption activity at combination of chemical modification and steam-gas activation exceed the value of 100 % (1000 mg/g) that meets the requirements to high quality industrially produced active carbons of SKT-0 grade.

scholarly journals Method for calculating the «mamsar+a» coupling with rope-core elements

2020 ◽  
Author(s):  
М.А. Минасян ◽  
Ц. Цзэн ◽  
А.М. Минасян
Keyword(s):  
Twist Angle ◽  
Experimental Studies ◽  
Original Method ◽  
The Finite Element Method ◽  
Diesel Generator ◽  
Working Length ◽  
Core Elements ◽  
Calculation Results ◽  
Twisting Angle ◽  
Exact Dependence

Цель представленной статьи – ознакомление читателей с оригинальной методикой расчета канатностержневой муфты «MAMSAR+A». Методика расчета канатностержневой муфты рассматривается применительно к экспериментальному дизель-генераторному агрегату мощностью 9,56 кВт при частоте вращения 1500 мин-1с дизелем 2Ч8,5/11 и генератором «КГ-5,6». Расчетная рабочая длина канатных стержней 90 мм, диаметр каната 12 мм с шестью одинаковыми прядями. Максимальный угол закручивания канатностержневой муфты принят 30°. Задача состоит в выводе уточненной зависимости угла закручивания от величины крутящего момента на основе теоретических и экспериментальных исследований для определения количества канатных стержней при заданных значениях диаметра и длины канатного стержня. Оригинальность методики заключается: 1. Учитывая, что канатностержневая муфта «MAMSAR+A» содержит несколько канатных стержней, каждый из которых состоит из шести прядей, то зависимость угла закручивания от величины крутящего момента изначально рассчитывается для одной пряди. 2. Зависимость угла закручивания от величины крутящего момента пряди получена по известной формуле для цилиндрического торсиона и методом конечных элементов. Далее путем умножения результатов расчета на число прядей получены значения для одного центрального и трех канатных стержней. Оси последних расположены по диаметру окружности равномерно под углом 120°. 3. Зависимость угла закручивания от величины крутящего момента одного центрального и трех канатных стержней получена также экспериментально с использованием специально разработанных авторами устройств. 4. На основе теоретических и экспериментальных исследований получены поправочные коэффициенты, обеспечивающие возможность получения точной зависимости угла закручивания канатного стержня от величины крутящего момента, а из нее уже необходимое их количество для всей муфты. Данная методика применима также для расчета канатных муфт в том числе и для других диаметров каната. The purpose of this article is to familiarize readers with the original method of calculating the rope-rod coupling «MAMSAR+A». The method of calculating the rope-rod coupling is considered in relation to an experimental diesel generator unit with a power of 9.56 kW at a rotation speed of 1500 min-1 with a diesel 2H8,5/11 and a generator "KG-5.6". The estimated working length of the rope rods is 90 mm, the diameter of the rope is 12 mm with six identical strands. The maximum twisting angle of the rope-rod coupling is 30°. The task is to derive a refined dependence of the twisting angle on the torque value based on theoretical and experimental studies to determine the number of rope rods at specified values of the diameter and length of the rope rod. The originality of the method: 1. Considering that the «MAMSAR+A» rope-rod coupling contains several rope rods, each of which consists of six strands, the dependence of the twisting angle on the torque value is initially calculated for one strand. 2. The Dependence of the twist angle on the value of the torque of the strand is obtained by the well-known formula for the cylindrical torsion and the finite element method. Further, by multiplying the calculation results by the number of strands, the values for one Central and three rope rods are obtained. The axes of the latter are evenly spaced along the circumference of the circle at an angle of 120°. 3. The Dependence of the twisting angle on the torque value of one Central and three rope rods was also obtained experimentally using devices specially developed by the authors. 4. Based on theoretical and experimental studies, correction coefficients have been obtained that make it possible to obtain an exact dependence of the twisting angle of the rope rod on the torque value, and from it the necessary number of them for the entire coupling. This method is also applicable for calculating rope couplings, including for other rope diameters.

scholarly journals Method for calculating the «mamsar+a» coupling with rope-core elements

2021 ◽  
pp. 96-103
Author(s):  
М.А. Минасян ◽  
Ц. Цзэн ◽  
А.М. Минасян
Keyword(s):  
Twist Angle ◽  
Experimental Studies ◽  
Original Method ◽  
The Finite Element Method ◽  
Diesel Generator ◽  
Working Length ◽  
Core Elements ◽  
Calculation Results ◽  
Twisting Angle ◽  
Exact Dependence

Цель представленной статьи – ознакомление читателей с оригинальной методикой расчета канатностержневой муфты «MAMSAR+A». Методика расчета канатностержневой муфты рассматривается применительно к экспериментальному дизель-генераторному агрегату мощностью 9,56 кВт при частоте вращения 1500 мин-1с дизелем 2Ч8,5/11 и генератором «КГ-5,6». Расчетная рабочая длина канатных стержней 90 мм, диаметр каната 12 мм с шестью одинаковыми прядями. Максимальный угол закручивания канатностержневой муфты принят 30°. Задача состоит в выводе уточненной зависимости угла закручивания от величины крутящего момента на основе теоретических и экспериментальных исследований для определения количества канатных стержней при заданных значениях диаметра и длины канатного стержня. Оригинальность методики заключается: 1. Учитывая, что канатностержневая муфта «MAMSAR+A» содержит несколько канатных стержней, каждый из которых состоит из шести прядей, то зависимость угла закручивания от величины крутящего момента изначально рассчитывается для одной пряди. 2. Зависимость угла закручивания от величины крутящего момента пряди получена по известной формуле для цилиндрического торсиона и методом конечных элементов. Далее путем умножения результатов расчета на число прядей получены значения для одного центрального и трех канатных стержней. Оси последних расположены по диаметру окружности равномерно под углом 120°. 3. Зависимость угла закручивания от величины крутящего момента одного центрального и трех канатных стержней получена также экспериментально с использованием специально разработанных авторами устройств. 4. На основе теоретических и экспериментальных исследований получены поправочные коэффициенты, обеспечивающие возможность получения точной зависимости угла закручивания канатного стержня от величины крутящего момента, а из нее уже необходимое их количество для всей муфты. Данная методика применима также для расчета канатных муфт в том числе и для других диаметров каната. The purpose of this article is to familiarize readers with the original method of calculating the rope-rod coupling «MAMSAR+A». The method of calculating the rope-rod coupling is considered in relation to an experimental diesel generator unit with a power of 9.56 kW at a rotation speed of 1500 min-1 with a diesel 2H8,5/11 and a generator "KG-5.6". The estimated working length of the rope rods is 90 mm, the diameter of the rope is 12 mm with six identical strands. The maximum twisting angle of the rope-rod coupling is 30°. The task is to derive a refined dependence of the twisting angle on the torque value based on theoretical and experimental studies to determine the number of rope rods at specified values of the diameter and length of the rope rod. The originality of the method: 1. Considering that the «MAMSAR+A» rope-rod coupling contains several rope rods, each of which consists of six strands, the dependence of the twisting angle on the torque value is initially calculated for one strand. 2. The Dependence of the twist angle on the value of the torque of the strand is obtained by the well-known formula for the cylindrical torsion and the finite element method. Further, by multiplying the calculation results by the number of strands, the values for one Central and three rope rods are obtained. The axes of the latter are evenly spaced along the circumference of the circle at an angle of 120°. 3. The Dependence of the twisting angle on the torque value of one Central and three rope rods was also obtained experimentally using devices specially developed by the authors. 4. Based on theoretical and experimental studies, correction coefficients have been obtained that make it possible to obtain an exact dependence of the twisting angle of the rope rod on the torque value, and from it the necessary number of them for the entire coupling. This method is also applicable for calculating rope couplings, including for other rope diameters.

STUDYING THE KINETIC CHARACTERISTICS OF THE EXTRACTION OF ANTHOCYANINS FROM THE SQUEEZE OF KRASNOSTOP ZOLOTOVSKY

2020 ◽  
Author(s):  
M.A. Egyan ◽  
Keyword(s):  
Reaction Rate ◽  
Sugar Content ◽  
Extraction Process ◽  
Efficiency Coefficient ◽  
Kinetic Characteristics ◽  
Reaction Rate Constants ◽  
Solids Content ◽  
Kinetics Of ◽  
Process Speed

The article shows studies characterizing the quality of the squeeze: the mechanical composition of the squeeze is determined, the structural moisture of each component is determined, the sugar content in the formed process of sedimentation of the juice and its acidity are determined refractometrically. The kinetics of anthocyanins extraction was determined in two ways, the solids content in the extract was calculated, and the reaction rate constants of the extraction process and the efficiency coefficient of ultrasonic amplification of the extraction process speed were calculated.

OS CAMINHOS DAS ÁGUAS NO MUNICÍPIO DE CARIRÉ, CEARÁ, BRASIL

2019 ◽  
Vol 21 (2) ◽  
pp. 564-580
Author(s):  
Eloiza Rocha Queiroz ◽  
José Falcão Sobrinho
Keyword(s):  
Water Resources ◽  
Potable Water ◽  
Field Trips ◽  
Central Theme ◽  
Northeast Region ◽  
Brazilian Semiarid ◽  
Long Time ◽  
Short Rains ◽  
Two Stages

A região Nordeste do Brasil vem sendo alvo de medidas do Estado a mais de um século, na tentativa de solucionar o problema da falta de água em época de secas. O Estado do Ceará, por sua vez, apresenta boa parte de seu território inserido no semiárido brasileiro, uma região caracterizada pelo clima seco, com poucas chuvas e elevada evapotranspiração. A problemática da água existe há bastante tempo, principalmente o acesso em quantidade e qualidade suficientes para atender a população. O presente trabalho tem como tema central a questão dos recursos hídricos, com enfoque no abastecimento humano do município de Cariré, localizado na região noroeste do Ceará. Nosso objetivo consiste em apresentar um panorama de como atualmente a população carireense tem acesso à água potável. A metodologia adotada constitui-se em duas etapas: na primeira, realizamos levantamento de material bibliográfico e a segunda diz respeito a parte prática realizada em saídas a campo. Segundo a ONU, a água é um bem comum e que deve ser de acesso a todos, é um direito humano. Nesta perspectiva, o gerenciamento adequado dos recursos hídricos é essencial para a manutenção da qualidade de vida. Palavras-chave: Recursos Hídricos; Abastecimento Humano; Cariré-Ce. ABSTRACTThe pnortheast region from Brazil has been subject of measures for more than a century in attempts to solve the problems lack of water in dry season. The state of Ceará has a good part of its territorial inserted in Brazilian semiarid, a region characterized by dry climate, short rains and high evapotranspiration. The water issue has existed for a long time, mainly in a sufficient access of quantity and quality to serve the population. Then, this article has as a central theme the water resources focusing on water supply of the Cariré localized at Northeast region from Ceará. Therefore the purpose of the paper is to present a study about how the Carire’s population has had access to potable water currently. The methodology adopted to this research consists of two stages: Firstly it was carried out a survey of bibliographical material and secondly it concerned the practical part carried out in the field trips. In accordance to United nations, water is a commom good and it has to be available to everyone, it is a human rights. In that sense, the proper management of water resources is essential to keep the quality of life.Key-words: Human supply; Water resources; Cariré – Ce. RÉSUMÉLa région du nord-est du Brésil est la cible de mesures prises par l’État depuis plus d’un siècle pour tenter de résoudre le problème de la pénurie d’eau en saison sèche. L’État du Ceará, en revanche, présente une bonne partie de son territoire inséré dans le semi-aride brésilien, région caractérisée par un climat sec, avec peu de pluies et une forte évapotranspiration. Le problème de l'eau existe depuis longtemps, principalement l'accès en quantité et qualité suffisantes pour satisfaire la population. Le travail actuel a pour thème central la question des ressources en eau, en mettant l'accent sur l'approvisionnement humain de la municipalité de Cariré, située dans la région nord-ouest du Ceará. Notre objectif est de présenter un aperçu de la façon dont la population carioca a actuellement accès à l’eau potable. La méthodologie adoptée comporte deux étapes: dans le premier, nous procédons à une enquête sur le matériel bibliographique et le second à la partie pratique réalisée lors des visites sur le terrain. Selon l'ONU, l'eau est un bien commun et doit être accessible à tous, c'est un droit humain. Dans cette perspective, la gestion adéquate des ressources en eau est essentielle au maintien de la qualité de la vie.Mots-clés: Ressources en eau; Approvisionnement humain; Cariré-Ce.

The system of indicators of the quality of the carbon-carbon composite materials and technologies of their production

2018 ◽  
pp. 127-132
Author(s):  
T. N. Antipova ◽  
D. S. Shiroyan
Keyword(s):  
Composite Material ◽  
Low Cost ◽  
Experimental Studies ◽  
Carbon Matrix ◽  
Carbon Composite ◽  
Optimal Number ◽  
Laboratory Equipment ◽  
Carbon Composite Material ◽  
Carbon Composite Materials

The system of indicators of quality of carbon-carbon composite material and technological operations of its production is proved in the work. As a result of the experimental studies, with respect to the existing laboratory equipment, the optimal number of cycles of saturation of the reinforcing frame with a carbon matrix is determined. It was found that to obtain a carbon-carbon composite material with a low cost and the required quality indicators, it is necessary to introduce additional parameters of the pitch melt at the impregnation stage.

scholarly journals Performance Evaluation of Heading-and-Winning Machines in the Conditions of Potash Mines

2021 ◽  
Vol 11 (8) ◽  
pp. 3444
Author(s):  
Sergey A. Lavrenko ◽  
Dmitriy I. Shishlyannikov
Keyword(s):  
Energy Efficiency ◽  
Experimental Studies ◽  
Efficiency Coefficient ◽  
Mechanized Method ◽  
Methodological Approaches ◽  
The Stability ◽  
Technical Solutions ◽  
Potash Mine ◽  
Complex Indicators ◽  
Potassium Magnesium

The authors focus on the process of potash ore production by a mechanized method. They show that currently there are no approved procedures for assessing the performance of heading-and-winning machines operating in the conditions of potash mines. This causes difficulties in determining the field of application of heading-and-winning machines, complicates the search for implicit technical solutions for the modernisation of existing models of mining units, prohibits real-time monitoring of the stability of stope-based technological processes and makes it difficult to assess the performance of the services concerning mining enterprises. The work represents an aggregate assessment of the performance of heading-and-winning machines for potash mines by determining complex indicators describing the technological and technical levels of organising the work in stopes. Such indicators are the coefficients of productivity and energy efficiency, respectively. Experimental studies have been carried out in the conditions of the potash mine of the Verkhnekamskoye potassium-magnesium salt deposit to assess the performance of the latest and most productive Ural-20R heading-and-winning machines manufactured in Russia. Using the above methodological approaches, this paper shows that the unsatisfactory technological performance of the studied machine is due to the low productivity of the mine district transport. The average productivity coefficient was 0.29. At the same time, high values of the energy efficiency coefficient show that the productivity of the machine is on par with design conditions.

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 Assessment of the Content of Dry Matter and Dry Organic Matter in Compost with Neural Modelling Methods

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 307
Author(s):  
Dawid Wojcieszak ◽  
Maciej Zaborowicz ◽  
Jacek Przybył ◽  
Piotr Boniecki ◽  
Aleksander Jędruś
Keyword(s):  
Image Analysis ◽  
Organic Matter ◽  
Dry Matter ◽  
Neural Model ◽  
Original Method ◽  
Neural Models ◽  
Test Error ◽  
Effective Assessment ◽  
Modelling Methods

Neural image analysis is commonly used to solve scientific problems of biosystems and mechanical engineering. The method has been applied, for example, to assess the quality of foodstuffs such as fruit and vegetables, cereal grains, and meat. The method can also be used to analyse composting processes. The scientific problem lets us formulate the research hypothesis: it is possible to identify representative traits of the image of composted material that are necessary to create a neural model supporting the process of assessment of the content of dry matter and dry organic matter in composted material. The effect of the research is the identification of selected features of the composted material and the methods of neural image analysis resulted in a new original method enabling effective assessment of the content of dry matter and dry organic matter. The content of dry matter and dry organic matter can be analysed by means of parameters specifying the colour of compost. The best developed neural models for the assessment of the content of dry matter and dry organic matter in compost are: in visible light RBF 19:19-2-1:1 (test error 0.0922) and MLP 14:14-14-11-1:1 (test error 0.1722), in mixed light RBF 30:30-8-1:1 (test error 0.0764) and MLP 7:7-9-7-1:1 (test error 0.1795). The neural models generated for the compost images taken in mixed light had better qualitative characteristics.

Sign in / Sign up

Export Citation Format

Share Document