scholarly journals Modeling the process of grinding feed by the method of damage accumulation

2021 ◽  
Vol 284 ◽  
pp. 02021
Author(s):  
Timmo Gavrilov
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Energy Consumption ◽  
Damage Accumulation ◽  
Optimal Number ◽  
Grinding Process ◽  
Technological Parameters ◽  
Number Of Cycles ◽  
Working Bodies ◽  
Good Agreement

The efficiency of the process of grinding meat and bone feed depends on a number of design and technological parameters of the grinder operation. One of the most significant issues and at the same time the least studied one is the influence of the number of cycles of loading meat and bone feed with the working bodies of grinders on the particle size of the finished meat and bone feed. To study this issue, the authors proposed a method for modeling the process of grinding meat and bone feed using a stochastic B-model of cumulative damage, which is based on an understanding of the process under study at the macroscopic level and experimental data. The constructed B-model made it possible to determine the optimal number of cycles of loading meat and bone feed with the working bodies of the grinders, at which the required particle size of the finished meat and bone feed is 3...5 mm, and there is no unnecessary energy consumption of the grinding process. This number is equal to 12...18 cycles. The results obtained by the B-model are in good agreement with the experimental data. The constructed B-model of the grinding process of meat and bone feed will further help optimizing the operation of the cutting device and reducing energy consumption for the operation of the grinders as a whole.

Effects of HMX Particle Size on the Shock Initiation of PBXC03 Explosive

2012 ◽  
Vol 13 (2) ◽  
Author(s):  
Li-Jing Wen ◽  
Zhuo-Ping Duan ◽  
Lian-Sheng Zhang ◽  
Zhen-Yu Zhang ◽  
Zhuo-Cheng Ou ◽  
...  
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Reaction Rate ◽  
Pressure Gauge ◽  
Rate Model ◽  
Shock Initiation ◽  
Gauge Data ◽  
Medium Formulation ◽  
Good Agreement

AbstractA series of shock initiation experiments are performed on the PBXC03 explosives in different formulations to understand the influence of the explosive particle size on the shock initiation, and the in-situ pressure gauge data are obtained which show that shock sensitivity decreases with the explosive particle size under the test condition used in this paper. Moreover, a mesoscopic reaction rate model which is calibrated by the experimental data on a medium formulation PBXC03 explosive is adopted and then applied to predict numerically the shock initiation of other PBXC03 explosives in different formulations. The numerical results are in good agreement with the experimental data.

Pemuatan listrik bipolar untuk partikel aerosol

2018 ◽  
Vol 4 (3) ◽  
pp. 287
Author(s):  
Heru Setyawan
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Ion Mobility ◽  
Opposite Sign ◽  
Aerosol Particles ◽  
Calculation Results ◽  
Two Parameters ◽  
Diffusion Charging ◽  
Fuchs Theory ◽  
Good Agreement

Bipolar diffusion charging of aerosol particles has been studied theoretically using Fuchs theory. Experimental data measured by several researchers available in the published literature were used to verify the calculation results. The calculation results show that Fuchs theory has been successfully used to predict the experimental data of the charging probability of submicron aerosol particles. The combination probability of ion-particle increases with the increase of particle size, both for particle and ion with the same sign and those with the opposite sign. However the combination probability is larger if the charges of particle and ion are of the opposite sign. Generally, Fuchs theory is not too easy to deal with due to the ill-defined of all parameters used, namely ion mass and ion mobility. These cause many possibilities of parameter combination that can give a good agreement with experimental data. Thus, in order to interpret the experimental results properly, the two parameters should be measured simultaneously with aerosol measurements.Keywords: Aerosol, Bipolar Charging, Combination ProbabilityAbstrakPemuatan listrik difusi bipolar partikel aerosol telah dipelajari secara teoritis menggunakan teori Fuchs. Sebagai verifikasi digunakan data eksperimen beberapa peneliti yang tersedia dalam literatur yang telah dipublikasikan. Hasil perhitungan menunjukkan bahwa teori Fuchs berhasil memprediksi dengan baik data eksperimen probabilitas pemuatan listrik partikel aerosol dalam rentang ukuran partikel berukuran submikron. Probabilitas penggabungan ion-partikel semakin besar dengan semakin besarnya ukuran partikel, baik untuk partikel dan ion yang memiliki tanda yang berlawanan maupun yang memiliki tanda yang sama. Akan tetapi, probabilitas penggabungan untuk partikel dan ion yang memiliki tanda yang berlawanan memiliki nilai yang lebih besar. Pada umumnya teori Fuchs tidak terlalu mudah untuk digunakan yang disebabkan oleh tidak terdefinisikannya dengan baik semua parameter yang digunakan, yaitu  massa ion dan mobilitas ion. Hal ini mengakibatkan banyak kemungkinan kombinasi parameter yang bisa menghasilkan kesesuaian yang bagus dengan data hasil pengukuran. Jadi, agar dapat menginterpretasikan hasil pengukuran dengan tepat, kedua besaran tersebut harus diukur secara serempak denganpengukuran aerosol.Kata Kunci: Aerosol, Pemuatan Listrik Bipolar, Probabilitas Penggabungan

A reaction-force-validated soccer ball finite element model

2016 ◽  
Vol 231 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Zahari Taha ◽  
Mohd Hasnun Arif Hassan
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Model ◽  
Reaction Force ◽  
Element Model ◽  
Optimal Number ◽  
Ball Impact ◽  
Soccer Ball ◽  
Mesh Density ◽  
Good Agreement

The soccer ball is one of the important pieces of equipment in the game of soccer. It undergoes various forms of impact during the game. In order to numerically investigate the occasions of ball impact such as soccer heading, a validated finite element model of a soccer ball is required. Therefore, a model was developed incorporating material properties obtained from literature. To ensure the accuracy of the model, it was validated against an established soccer ball model and experimental data of the coefficient of restitution, contact time, longitudinal deformation and reaction force. In addition, a parametric study of the mesh density was also performed to determine the optimal number of elements. The developed soccer ball model was found to be in a good agreement with the literature and experimental data. This suggests that, the soccer ball model is capable of replicating the impacts of interest. This article details the development of the model and the validation processes.

Optimal Design for Rice Straw Briquetting Process Based on Experiments

2016 ◽  
Author(s):  
Yu Wang ◽  
Yu Sun ◽  
Kai Wu ◽  
Xianfei Xia
Keyword(s):  
Experimental Data ◽  
Energy Consumption ◽  
Moisture Content ◽  
Rice Straw ◽  
Lower Energy ◽  
Optimization Design ◽  
Specific Energy Consumption ◽  
Agricultural Crop ◽  
Technological Parameters ◽  
Test Platform

Ineffective utilization of agricultural crop straw is a big problem in agricultural developing countries. In this study, optimization design was carried out for the rice straw briquetting process based on experiments. A briquetting test platform designed by the authors was used to measure the specific energy consumption, extrusion pressure, as well as the density and compressive strength of the products made by rice straw under different technological parameters. These parameters included moisture content, temperature, pressure and pressing speed. Finally, optimal technological parameters were provided based on the experimental data. Results show that, lower energy consumption and better products quality are achieved when the moisture content is within 15% ∼ 20%, the temperature is within 110 °C ∼ 120 °C, the pressure is within 50 MPa ∼ 60 MPa and the pressing speed is within 40 mm/min ∼ 60 mm/min.

Laboratory simulation of light scattering from regolith analogue: Effect of porosity and particle size

2019 ◽  
Vol 15 (S350) ◽  
pp. 372-374
Author(s):  
Amritaksha Kar ◽  
Asoke K Sen
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Light Scattering ◽  
Solar System ◽  
Laboratory Data ◽  
Laboratory Simulation ◽  
Meteorite Impacts ◽  
Composition And Structure ◽  
Solar System Bodies ◽  
Good Agreement

AbstractThe surfaces of most of the atmosphereless solar system bodies are referred to as regolith or layers of usually loosely connected fragmentary debris, produced by meteorite impacts. Measurement of light scattered from such surfaces provide information about the composition and structure of the surface. In the present work, the effect of porosity and particle size, on reflectance is studied for regolith like samples. For modelling the experimental data Hapke 2008 is used and found to be in good agreement with laboratory data. From the present study, it can be concluded that the physical properties of a regolith, such as porosity, particle size etc are effectively represented by albedo.

scholarly journals Modelling of elastic properties of sintered porous materials

2013 ◽  
Vol 469 (2154) ◽  
pp. 20120689 ◽  
Author(s):  
A. V. Manoylov ◽  
F. M. Borodich ◽  
H. P. Evans
Keyword(s):  
Experimental Data ◽  
Porous Materials ◽  
Damage Accumulation ◽  
Statistical Distributions ◽  
Metal Powders ◽  
Combined Model ◽  
Loaded Material ◽  
Sintered Materials ◽  
Good Agreement ◽  
Elastic Characteristics

Models for prediction of the elastic characteristics of natural and synthetic porous materials are re-examined and new models are introduced. First, the Vavakin–Salganik (VS) model for materials with isolated spherical pores is extended in order to take into account various statistical distributions of pore sizes. It is shown that the predictions of the extended VS model are in good agreement with experimental data for porous materials with isolated pores such as foamed titanium, porous glass and sandstone. However, the model is in a considerable disagreement with the experimental data for materials sintered from metal powders. The disagreement is explained by the presence of merged and open pores whose shapes cannot be well approximated as spheres. Using the theory of geometrical probabilities, the amount of pores that are close enough to overlap is estimated, and a model is introduced where merging pores are modelled as corresponding ellipsoids. Another modification is proposed to take into account open pores. This modification is based on the classical Rabotnov–Kachanov approach to damage accumulation in the loaded material. Finally, predictions given by the above models, and their combination is compared with experiments. A good agreement is observed between the combined model and the available experimental data for a variety of sintered materials.

scholarly journals The Process of Operation of a Mobile Straw Spreading Unit with a Rotating Finger Body-Experimental Research

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1144
Author(s):  
Boris Boltianskyi ◽  
Radmila Sklyar ◽  
Natalia Boltyanska ◽  
Larysa Boltianska ◽  
Serhii Dereza ◽  
...  
Keyword(s):  
Experimental Data ◽  
Energy Consumption ◽  
Experimental Research ◽  
Rotation Speed ◽  
Bedding Material ◽  
Working Process ◽  
Spreading Process ◽  
Unit Speed ◽  
And Performance ◽  
Working Bodies

This article presents methods and results of experimental research to determine the power consumed when driving the working bodies of the straw bedding mobile spreader to cover cow stalls (boxes). Analysis of the design and mode parameters of the rotary finger working body influence on the energy consumption of the bedding material spreading process is carried out. Using the experimental data, it was established that the power consumed to drive the rotary finger working body of the mobile straw bedding spreader, at the tractor power take-off (PTO) shaft rotation speed of 540 min−1, the forward unit speed of 2 km/h, and performance of 1.5 kg/s, is equal to 7.633 kW. In this case, due to the installation of a rotary finger working body for spreading straw bedding, the power consumption increased by 9%. This increase will not have a significant impact on the overall energy consumption of the spreading bedding material working process, because this class tractor power reserve allows its use.

scholarly journals The Application of Similarity Theory and Dimensional Analysis to the Study of Centrifugal-Rotary Chopper of Forage Grain

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4501
Author(s):  
Wacław Romaniuk ◽  
Petr Savinykh ◽  
Kinga Borek ◽  
Kamil Roman ◽  
Alexey Y. Isupov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Dimensional Analysis ◽  
Similarity Theory ◽  
Empirical Relationship ◽  
Vertical Axis ◽  
Similarity Criteria ◽  
Technological Parameters ◽  
Initial Stage ◽  
Wide Range ◽  
Working Bodies

This article presents the device and the principle of operation of forage grain crushers that use the centrifugal force of inertia to supply the working bodies—which occurs as a result of rotation of the rotor with a vertical axis. The results of some tests of machines working on this principle have been characterized. Attention is drawn to the disadvantages of most research works, namely the lack of premises for creating shredders of this class with a wide range of performance. The aim of this work is to establish the relationship between the design and technological parameters for the operation of a centrifugal-rotary shredder using the theory of similarity and a dimensional analysis. Moreover, the experimental data show an empirical relationship when calculating the efficiency for the shredder model considered above. By applying the similarity criteria, dimensionless complexes were obtained, which allow to determine the significance of the parameters selected at the initial stage for the efficiency of the shredder. The novelty of this research is the application of the theory of similarity and the use of dimensional analysis, which allowed for scaling the results of the experimental data and obtaining a centrifugal-rotary shredder with higher efficiency, while maintaining the quality of the obtained product. This technique indicates the energy costs of the grinding process, which can be used to select the ratio of parameters in the shredder that would ensure that a minimum amount of energy is consumed.

scholarly journals PREPARATION OF WOOD FIBER SEMI-FINISHED PRODUCTS IN KNIFE MACHINES OF VARIOUS MODIFICA-TION

2020 ◽  
pp. 459-466
Author(s):  
Natal'ya Geral'dovna Chistova ◽  
Venera Nurullovna Matygulina ◽  
Yuri Davydovich Alashkevich
Keyword(s):  
Experimental Data ◽  
Regression Models ◽  
Wood Fiber ◽  
Wood Pulp ◽  
Design Parameters ◽  
Grinding Process ◽  
Technological Parameters ◽  
Grinding Machines ◽  
Qualitative Characteristics

In this paper, we consider the results of a study of the influence of the design and technological parameters of grinding machines of various modifications on the quality of wood pulp. According to the results of processing multifactor experiments implemented according to the second-order B-plan, a mathematical description was obtained of the dependence of the degree of grinding of pulp on the gap between the grinding disks, wear of the segments, the rotational speed of the lower screw and the concentration of pulp. The obtained regression models are adequate to the process and can be applied in practice for predicting the qualitative characteristics of wood pulp depending on the parameters of the grinding process. Analyzing the obtained experimental data, it can be noted that such factors as the state of the surfaces of grinding disks, the gap between them and the concentration of wood fiber have the greatest influence on the degree of grinding of the mass. Evaluation of graphical dependencies allows you to determine the extent to which you can vary the operating and design parameters of the grinding process to obtain wood fiber with the required grinding quality.

VAV System Operating in an Educational Building Under Tropical Conditions: Modeling and Simulation

2013 ◽  
Author(s):  
Oscar Alvarez ◽  
Marco Sanjuan ◽  
Fabian Amaya ◽  
Antonio Bula
Keyword(s):  
Experimental Data ◽  
Energy Consumption ◽  
Modeling And Simulation ◽  
Transient Process ◽  
Maximum Error ◽  
Tropical Conditions ◽  
Caribbean Area ◽  
The Caribbean ◽  
System Operating ◽  
Good Agreement

An educational building located in the Caribbean area of Colombia that uses a VAV system has been modeled and simulated in order to quantify the energy consumption. The energy values attained has been compared with the real energy consumption obtained from the data system. The results show that the error introduced are sensitive to the building mass at the beginning of the transient process, never the less, as the transient continues, the software shows good agreement with the experimental data. The maximum error at the beginning is 25% and decreases to 10%.

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