Vibrations in engineering and technology最新文献

{"title":"INCREASING THE ULTRASONIC TECHNOLOGICAL ACTION EFFICIENCY IN THE FOOD RAW MATERIALS PROCESSING","authors":"I. Bernyk","doi":"10.37128/2306-8744-2021-4-11","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-11","url":null,"abstract":"The increase of ultrasonic technological action efficiency at food raw materials processing by taking into account their rheological properties is investigated. We have proved the need to determine the classification characteristics of food media, which are crucial for their processing and reflect the change in ultrasonic treatment. The mode of loading on the emitter, physical characteristics and conditions of exposure to the emitter are among the key features. It was found that acoustically unlimited media with constant and variable physical parameters with constant and variable dimensions have a significant impact on the processing. The efficiency of the oscillations in acoustically unlimited and limited environments is ensured by matching the value of the input resistance with the source of oscillations and with the waveguide system. Physical characteristics of food media, conditions of influence on the emitter are revealed. The identified classification features reflect the main key aspects of improving the efficiency of ultrasonic technological action in the food raw materials processing, which are related to the assessment of the waves’ propagation in the media and the interaction of these waves with the emitter. It is established that the Kelvin-Voigt model is one of the most reliable, it reflects the certain rheological properties of the medium in the conditions of ultrasonic cavitation treatment. Taking into account the conversion of ultrasonic energy, the main stages of the process are identified. The dependences of the amplitude of the sound pressure on the thickness of the fluid treatment layer are established, taking into account the viscosity of the liquid. The dependences of the radius of the cavitation bubble on the amplitude of the sound pressure and the thickness of the liquid layer are revealed. The wave resistance of the medium is studied and analytical dependences are obtained to determine the intensity of the technological process by which the increase of the efficiency of the processes of ultrasonic technological action in the food raw materials processing is realized.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127966566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESULTS OF EXPERIMENTAL RESEARCHES OF DEEP VIBRATORS WITH THE HYDROPULSE DRIVE FOR CONSOLIDATION OF CONCRETE MIXES","authors":"I. Kots, Yuriy Kurylenko","doi":"10.37128/2306-8744-2021-4-3","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-3","url":null,"abstract":"The journal deals with the problems of vibration technologies and machines, mathematical methods of vibration process studies, information on design and technological development, presents teaching and methodological aspects of teaching in the Higher School of Applied Sciences, where vibration machines and technologies are studied.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121265524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INVESTIGATION OF THE OPERATING MODE OF THE DYNAMIC SYSTEM \"VIBRATION PLATE - POLYMER CONCRETE\" WITH SURFACE COMPACTION","authors":"Dmitry Savielov","doi":"10.37128/2306-8744-2021-4-4","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-4","url":null,"abstract":"For the theoretical definition of the law of motion and operating modes of the vibration plate of the surface vibration working body with polymer concrete, a study of the dynamic system \"vibration plate - polymer concrete\" was carried out. In this dynamic system, compacted polymer concrete is presented in the form of a system with distributed parameters, which takes into account the action of elastic and dissipative resistance forces acting on the part of polymer concrete when it is deformed into a form on a rigid foundation. According to the accepted rheological model of polymer concrete for conditions of uniaxial stress state, a partial derivative relationship is proposed between the stress and deformation of polymer concrete, the nature of which depends on the dynamic modulus of elastic deformation, the dynamic modulus of elastic deformation of Maxwell and the coefficient of dynamic viscosity.\u0000\u0000A wave equation of vibrations has been compiled, which describes the propagation of elastic-viscous deformation waves in polymer concrete, which is deformed by a surface vibrating working body, the solutions of which made it possible to determine: the regularity of propagation of elastic-viscous deformation waves in compacted polymer concrete, as well as theoretical expressions for the numerical determination of the reduced coefficients stiffness and dissipative resistance of polymer concrete, added mass; the law of motion and the amplitude of vibrations of the vibrating plate, as well as the laws of motion of the surface layer of polymer concrete.\u0000\u0000The obtained theoretical dependences make it possible to reasonably determine the rational parameters of the vibrating working body and the main operating modes of the vibrating plate, depending on the found physical and mechanical characteristics of the polymer concrete compacted by vibration. The results obtained can be further used to carry out theoretical studies on the analytical determination of the nature of the change in stresses along the height of the compacted layer of polymer concrete, as well as in the analysis and synthesis of the obtained vibro-shock mode of operation of the vibrating plate.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130003897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"THE ULTRASOUND APPLICATION IN THE PRODUCTION OF FERMENTED MILK PRODUCTS","authors":"O. Yaremchuk, Nadii Novgorodka","doi":"10.37128/2306-8744-2021-4-10","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-10","url":null,"abstract":"Fermented dairy products are one of the most important sources of essential amino acids, vitamins, trace elements and other biologically active substances that support the activity of the human immune system and reduce the impact of harmful environmental factors, so their daily presence in the diet is recommended.\u0000\u0000The longest stage in the production of such dairy products is the fermentation process. This process requires the use of large volumes of production areas, and high energy consumption to maintain the temperature, so reducing the duration of the fermentation process without adversely affecting the consumer properties of products is a priority.\u0000\u0000The development of various types of dairy products is also relevant, which is natively enriched with functional substances and does not require special additives, which translates it into the segment of natural and organic products, as well as reduces costs and increases the availability of certain medical diets.\u0000\u0000The ultrasonic treatment of the fermented mixture is a promising tool for solving the tasks. In recent decades, ultrasound has proven to be a powerful and economical tool for changing the physical state of matter, dispersing, emulsifying, changing the rate of diffusion, crystallization and dissolution of substances, and activation of chemical and biochemical reactions.\u0000\u0000It is becoming more widely used in various technological processes due to these properties, as well as the emergence of relatively inexpensive, efficient and reliable ultrasonic equipment that allows you to generate ultrasound of different frequency and intensity. \u0000\u0000The control indicator in the research was to measure the increase in the active acidity of milk during fermentation by lactic acid mesophilic microorganisms. Thus, the possibility of using ultrasonic treatment as a factor in intensifying the fermentation process is proved.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124146803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EXPERIMENTAL EVALUATION OF ENERGY PARAMETERS OF BULK VIBROSEPARATION OF BULK PRODUCTS","authors":"O. Omelyanov","doi":"10.37128/2306-8744-2021-4-7","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-7","url":null,"abstract":"The article presents the results of experiments to evaluate vibration parameters when using spatial oscillation excitation drive. Among the main directions of the intensification of the vibration technological action during separation of bulk agricultural products, not only the adjustment of amplitude-frequency characteristics can be noted, but also the improvement of the geometric and structural parameters of the drive mechanisms. Currently, in the processes of separation or classification of bulk masses by the method of siting separation, fixed sieves are displaced by sieves receiving an additional power pulse in order to intensify this processing process. The developed scheme of the drained vibration process involves the oblique location of the working body, which allows to implement the creation of spatial oscillations of the sieve surface. The developed experimental model of the spatial oscillation screen and the studies carried out to obtain graphic dependence of the energy consumption on the process of treating crushed grain material from changes in mass, geometric and structural parameters of the oscillating system. When choosing a rational mode of vibration cutting of bulk products as the evaluation criteria used the eccentricity of the drive shaft, the angle of the tilt surface, the value of the energy consumption and the pattern of its change in the conditions of variation of the power pulse when the eccentricity of the drive shaft, the trajectory of the movement of the sieve elements and the, bulk mass by changing the angle the inclination of the working container, the measurability of the oscillatory movement from the flat to the spatial parameters of the developed vibro-industry, corresponding to the configuration of the structural parameters. Experimental studies have shown the effectiveness of the use of spatial oscillations of the sieve surface during separation of bulk masses, made it possible to substantiate the structural parameters of the vibratory screen.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"686 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116956354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"STUDY OF THE KINEMATICS OF PLASTIC FLOW OF A METAL USING THE EULER AND LAGRANGE VARIABLES","authors":"R. Sivak, Roman Zalizniak","doi":"10.37128/2306-8744-2021-4-8","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-8","url":null,"abstract":"В механіці суцільних середовищ знайшли застосування\u0000дві еквівалентній одна одній точки зору на течію металу в\u0000процесі деформування – Ейлера та Лагранжа. Коли увагу\u0000концентрують на даній точці простору, в яку приходять різні\u0000частки суцільного середовища в процесі деформування – це\u0000сутність точки зору Ейлера на досліджуваний рух суцільного\u0000середовища. З погляду Лагранжа, рух вважається відомим,\u0000якщо швидкість, прискорення, температура та інші величини\u0000задані як функції координат точки простору та часу.\u0000Сутність погляду Лагранжа на вивчений рух полягає в тому,\u0000що увагу концентрують на конкретній частці суцільного\u0000середовища та досліджують історією її деформування та\u0000руху. Координати, що індивідуалізують точки суцільного\u0000середовища та час називаються змінними Лагранжа. Погляд\u0000Лагранжа на вивчення руху суцільного середовища лежить в\u0000основі фізичних законів, оскільки пов'язаний з рухом окремих\u0000часток. У початковий момент координати певної точки по\u0000Ейлеру та Лагранжу збігаються.\u0000В статті розглядається можливість застосування\u0000змішаних координат Ейлера та Лагранжа для визначення\u0000компонент тензора швидкостей деформацій в процесах\u0000пластичного деформування. Доцільність підходу Лагранжа та\u0000Ейлера з'ясовується в конкретних задачах. При цьому слід\u0000враховувати, що в координатах Ейлера рівняння рівноваги\u0000мають більш простий вигляд (вони лінійні), а граничні умови –\u0000складніший внаслідок того, що неможливо, не розв'язуючи\u0000задачі, визначити компоненти переміщення, які зазвичай\u0000входять до граничних умов. У координатах Лагранжа крайові\u0000умови, як правило, записуються простіше, а рівняння\u0000рівноваги – складніше.\u0000При обробці металів тиском метал зазнає значні\u0000деформації. Однак кожен процес зручно розглядати у кожний\u0000фіксований момент його протікання, тому необхідне знання\u0000основних положень та залежностей, що відносяться до малих\u0000деформацій.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129659740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALYSIS OF VIBRATION TECHNICAL DEVICES FOR DRYING PUMPKIN SEEDS","authors":"Tsurkan Oleh","doi":"10.37128/2306-8744-2021-4-1","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-1","url":null,"abstract":"A significant obstacle to the expansion of pumpkin production is the lack of quality seed. In connection with the imperfection of existing means for post-harvest seed treatment, it becomes necessary to develop new drying methods that would ensure high quality of the finished product, create conditions for complete and timely processing of the harvested crop, reduce losses, automate, mechanize and significantly intensify this process, as well as reduction of specific energy consumption. When analyzing the latest studies on drying seed products, it was noted that most of the work relates specifically to post-harvest processing of wheat grains, slightly less to drying corn and legumes, and a very insignificant share concerns vegetables and melons. A fundamental requirement of the drying process for pumpkin seeds as seed and food is to ensure standard quality endpoints.\u0000In installations where pumpkin seeds are dried in a fixed bed, the upper layer of the seed embankment dries up last, the quality of the lower layer deteriorates due to overdrying below the optimum value. This causes significant heterogeneity in the moisture content of the seed mass. Considering the large range of moisture removal when drying high-moisture pumpkin seeds, when the available moisture reduction in one pass is 6%, the use of drum dryers due to the need to organize multiple passes, as well as the tendency of the seed mass, is technically and economically impractical. Conveyor dryers are difficult to maintain, expensive and have low productivity. It is difficult to use differentiated modes of seed drying in them, and also in the design it is necessary to take into account the increased cohesive-adhesive properties of the seed layer.\u0000The drying process, taking into account the necessary requirements associated with the characteristics of pumpkin seeds, it is advisable to carry out in dryers with vibration layer loosening. To improve the flowability of a layer of seeds prone to sticking, sticking, channeling, agglomeration, at the initial stage of vibration drying, along with vibration and aeration mixing, it is advisable to use additional mechanical stirrers.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126641237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"WAYS OF INTENSIFICATION OF PRODUCTION HERB SEEDS","authors":"A. Spirin, O. Tsurkan, I. Tverdokhlib, O. Omelyanov","doi":"10.37128/2306-8744-2021-4-12","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-12","url":null,"abstract":"The journal deals with the problems of vibration technologies and machines, mathematical methods of vibration process studies, information on design and technological development, presents teaching and methodological aspects of teaching in the Higher School of Applied Sciences, where vibration machines and technologies are studied.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"356 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115936090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INVESTIGATION OF PULSE VIBRATION OF THE PERIODICALLY WORKING INJECTOR OF THE MILKING WASHING SYSTEM","authors":"I. Babyn","doi":"10.37128/2306-8744-2021-6","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-6","url":null,"abstract":"As a result of the analysis of technical and technological support of washing of milking installations it is established that the most effective are circulating systems of washing with regulated formation of a stopper mode with use of air injectors on the basis of automatic control. The consequences of periodic operation of the injector is the phenomenon of hydraulic shock, which is caused by a sudden change in the phase distribution of the flow of two-phase washing solution. This leads to a sudden change in the momentum of the two-phase washing solution, causing a pressure wave moving through the system. This pressure wave can lead to the destruction of milk deposits on the walls of the milk line, as well as to possible damage to the equipment of the milk system. The aim of the study is to increase the efficiency of the milking system flushing system by using pulsed vibration of a periodically operating injector. As a result of numerical simulation of the process of washing the milk line of the milking parlor using an injector in the software package STAR-CCM + was determined by the dynamics of changes in vacuum pressure at a distance from the injector (p (0 m), p (1 m), p (2 m), p ( 3 m), p (4 m), p (5 m)) and the dynamics of changes in the content of components of the multiphase medium (washing solution αf, air αg, milk αm) for four options: the injector is constantly closed, the injector is constantly open and the injector is periodically opened (1 s and 9 s) and closes (1 s and 9 s). It is established that the use of a periodic injector allows to reduce the milk content in the milk line faster and by a larger value, which indicates a better washing process. The addition of the physical-mathematical apparatus of the hydraulic shock phenomenon for a periodically operating air injector of the flushing system allowed to establish that the rate of pressure change depends on the velocities and concentrations of phases of two-phase washing solution, ie its flow regime and shock wave propagation velocity. Therefore, the rate of pressure change Δp / Δt is chosen as a criterion for the action of hydraulic shock.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128813141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MODELING OF TECHNOLOGICAL PROCESSES OF FILLING THE GEOMETRIC STRUCTURES OF THE WORKING BODIES OF A BUNKER TYPE OF AGRICULTURAL MACHINES WITH MATERIALS OF A SPHERICAL SHAPE","authors":"V. Dubchak, Viktor Pryshlyak","doi":"10.37128/2306-8744-2021-4-9","DOIUrl":"https://doi.org/10.37128/2306-8744-2021-4-9","url":null,"abstract":"Optimization of geometric parameters of bunkers, feeders of agricultural machines depends on the type of process, mechanical and technological properties of materials, production technologies. Modern containers can be metal, plastic or glass. Growing requirements in a competitive market environment necessitate the constant improvement of existing and the creation of new machines with optimal parameters of the working bodies. Various agricultural materials, such as sandy soils, grain, fertilizers, tubers, fruits have different properties of flowability and mutual movement of particles in the form of spherical bodies. The article presents improved theoretical principles of practical orientation of optimal filling of containers with agricultural materials.\u0000\u0000As a result of research on modeling of technological processes of filling geometric structures with working materials of spherical shape, using a fundamental analytical and mathematical apparatus, an algorithmic model that describes the optimal filling of space typical for seed boxes, harvesters or seeders has been developed. The maximum filling of a given flat and three-dimensional geometric figure by a set of balls of the same radius have been calculated, namely, the quantitative component of such optimal filling is described, and the criterion for estimating such filling is formed. Such processes occur during the production operation of seeders and planters, machines for harvesting and post-harvest processing of grain, root crops, fruits, etc.\u0000\u0000The use of an algorithm for mathematical analysis and calculation of technological processes and technical systems provides the creation of the necessary conditions to prevent injury to seeds. In addition, innovative methods of theoretical analysis and calculation of processes, as well as phenomena characteristic of agro-industrial production have been proposed. These methods can be effectively applied in the educational process when preparing specialists for project activities.","PeriodicalId":171295,"journal":{"name":"Vibrations in engineering and technology","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123255700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}