scholarly journals Analysis of geometric parameters and technical requirements for pin conical joints in pump nodes

2021 ◽  
pp. 24-35
Author(s):  
Ivan Dehtiarov ◽  
Anna Neshta ◽  
Mykola Samardak ◽  
Vitalii Kononovych ◽  
Yaroslav Klok
Keyword(s):  
Geometric Analysis ◽  
Contact Length ◽  
Machine Building ◽  
Geometric Parameters ◽  
Technical Requirements ◽  
Pumping Equipment ◽  
First Time ◽  
Building Enterprises

The article analyzes the causes of the situation with the appearance of manufacturing errors and the lack of the necessary technical requirements to perform a pin conical joint his intended purpose. The analysis was performed based on geometric construction of the assembly dimensional chain of two parts to be connected and a conical pin with a taper 1:50 according to GOST 9465-79, which is used in the pin joints of pumping equipment. The geometric analysis included the separation of deviations into linear dimensions and angular deviations. The values of the angular deviations were reduced to the linear values of their projections along the axis of the pin, to determine the tolerance on the end height protrusion of the pin above the surface of the connecting parts. Also, the unfoundedness of assigning the roughness index of the hole under the pin at the level of Ra 1.6 μm and its inexpediency when it is impossible to ensure the required contact length is theoretically proved and the solution of this contradiction is proposed. A detailed analysis of the technical requirements for drawings of pumping equipment units containing pin conical joints and paragraphs of the relevant standards, which resulted in the inconsistencies, and offer recommendations that will ensure the quality of the joint following its official purpose. Analysis of the geometric parameters of pin conical joints for the first time allowed to determine the dependence of the height of the pin end protrusion above the surface of the connecting parts and the tolerance for this parameter, as well as to propose mathematical dependences for their determination. The presented dependencies can be used in practice for a reasonable calculation during the design of pin conical joints in pump nodes and in machine-building enterprises where such joints are used. For the first time, the determination of the tolerance for hole size for machining conical reamers is presented, and the formula for calculating this parameter is proposed, which is given in the recommendations for their use in machine building enterprises and products containing pin conical joints.

scholarly journals The Impact of the Quality of Tap Water and the Properties of Installation Materials on the Formation of Biofilms

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1903 ◽  
Author(s):  
Dorota Papciak ◽  
Barbara Tchórzewska-Cieślak ◽  
Andżelika Domoń ◽  
Anna Wojtuś ◽  
Jakub Żywiec ◽  
...  
Keyword(s):  
Tap Water ◽  
Galvanized Steel ◽  
Phosphorus Compounds ◽  
Plate Count ◽  
Nickel Steel ◽  
Quantitative Analyses ◽  
The Impact ◽  
First Time

The article presents changes in the quality of tap water depending on time spent in installation and its impact on the creation of biofilms on various materials (polyethylene (PE), polyvinyl chloride (PVC), chrome-nickel steel and galvanized steel). For the first time, quantitative analyses of biofilm were performed using methods such as: Adenosine 5’-triphosphate (ATP) measurement, flow cytometry, heterotrophic plate count and using fractographical parameters. In the water, after leaving the experimental installation, the increase of turbidity, content of organic compounds, nitrites and nitrates was found, as well as the decrease in the content of chlorine compounds, dissolved oxygen and phosphorus compounds. There was an increase in the number of mesophilic and psychrophilic bacteria. In addition, the presence of Escherichia coli was also found. The analysis of the quantitative determination of microorganisms in a biofilm indicates that galvanized steel is the most susceptible material for the adhesion of microorganisms. These results were also confirmed by the analysis of the biofilm morphology. The roughness profile, the thickness of the biofilm layer can be estimated at about 300 μm on galvanized steel.

scholarly journals Simultaneous Determination of Six Active Compounds in Yixin Badiranjibuya Granules, a Traditional Chinese Medicine, by RP-HPLC-UV Method

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Ning Yu ◽  
ChenHui He ◽  
Gulistan Awuti ◽  
Cheng Zeng ◽  
JianGuo Xing ◽  
...  
Keyword(s):  
Chinese Medicine ◽  
Rosmarinic Acid ◽  
Quality Evaluation ◽  
Scientific Basis ◽  
Determination Method ◽  
Rp Hplc ◽  
And Control ◽  
First Time

In this study, a sensitive, precise, and accurate HPLC-UV method was developed and validated to simultaneously determine the six analytes (luteolin-7-O-β-D-glucuronide, apigenin-7-O-β-D-glucuronide, diosmetin-7-O-β-D-glucuronide, acacetin-7-O-β-D-glucuronide, tilianin, and rosmarinic acid) in Yixin Badiranjibuya Granules, in which five analytes (i.e., luteolin-7-O-β-D-glucuronide, apigenin-7-O-β-D-glucuronide, diosmetin-7-O-β-D-glucuronide, acacetin-7-O-β-D-glucuronide, and rosmarinic acid) were determined for the first time in Yixin Badiranjibuya Granules, the content of tilianin in Yixin Badiranjibuya Granules was reported in other literatures, and the content of tilianin in our work was higher than that of the literature reports. The quality of 11 batch samples from four different manufacturers was evaluated using the proposed determination method. The contents of the six analytes were largely different among samples from various manufacturers. Therefore, this determination method can provide a scientific basis for quality evaluation and control of Yixin Badiranjibuya Granules.

scholarly journals Formation of mutual relations between enterprises and business partners in the process of preparation and production of new products

2021 ◽  
pp. 196-211
Author(s):  
Olena Iastremska ◽  
Hanna Strokovyc ◽  
Olesia Iastremska ◽  
Christos Kalantaridis ◽  
Mariann Veresne Somosi
Keyword(s):  
Factor Analysis ◽  
Methodological Approach ◽  
New Products ◽  
Machine Building ◽  
Business Partners ◽  
Study Results ◽  
Effective Models ◽  
The Relationship ◽  
Building Enterprises

This article summarizes the scientific approaches to improving the quality of relations between the enterprise and business partners in preparation for the release and production of new products in today's economic realities. The study's main purpose is to substantiate and develop a methodological approach for determining effective relationship models between enterprises and business partners to prepare and produce new products. The article presents a developed four-stage methodological approach. The first stage of the study presents an analysis of existing approaches to forming relationships between the enterprise and business-business partners to prepare and produce new products. In the second stage, factual data on machine-building industry enterprises' functioning were collected to determine the effectiveness of cooperation and success, which are the key components that improve the quality of relations between the enterprise and business partners in preparing new products. At the third stage, partners' priority was determined to characterize the quality of the relationship between machine-building enterprises and business-business partners. The fourth stage determined the relationship between the qualitative levels of business partners' priority and appropriate relationship models to prepare and produce new products. The study used expert methods, multidimensional factor analysis, additive convolution method, structural-logical method, graphical method. A survey of enterprise representatives was conducted to assess the effectiveness of cooperation on 12 surveyed machine-building enterprises. Partial indicators were identified and substantiated by multidimensional factor analysis, generalized for making decisions about business partner enterprises' existing opportunities to prepare and produce new products. Based on the calculation of the integrated indicator, partners' priority was determined. That characterized the quality of relations between machine-building enterprises and business-business partners in preparing and producing new products. According to the Harrington scale specified for the economic conditions of Ukraine, the qualitative levels of partner companies' priority were determined. The proposed effective models of relationships for preparing and producing new products are put in line with them. The study results could improve the quality and validity of the formation and maintenance of relationships between enterprises and business partners in preparing and producing new products.

Development of a Method for Simultaneous Determination of Two Stilbenes and Four Anthraquinones from Polygonum Cuspidatum by RP-HPLC

2019 ◽  
Vol 102 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Jianye Yan ◽  
Yuanqing Wang ◽  
Hongnian Wu ◽  
Zhicheng Sun ◽  
Shihan Tan ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Gradient Elution ◽  
Reversed Phase ◽  
Polygonum Cuspidatum ◽  
Chinese Medicinal Herb ◽  
Simple Method ◽  
Rp Hplc ◽  
First Time

Abstract Background: Polygonum Cuspidatum Sieb. et Zucc. (named Huzhang in China) is a traditional and popular Chinese medicinal herb used in removing jaundice, clearing heat-toxin, improving blood circulation, expelling stasis, dispelling wind and dampness, repelling phlegm, and suppressing cough. It is widely used in drug and functional food fields and distributed throughout the world, including in China, Japan, and North America. Objective: To control the quality of Polygonum Cuspidatum, an effective, reliable, and simple method for simultaneous determination of two stilbenes (polydatin, resveratrol) and four anthraquinones (emodin, physcion, rhein, and anthraglycoside B) was developed and validated for the first time in this study by reversed-phase HPLC (RP-HPLC). Methods: Separation was carried out on Agilent C18 column (250 × 4.6 mm I.D., 5 μm) with acetonitrile and 0.10% aqueous phosphoric acid as mobile phase and gradient elution at a flow rate of 0.8 mL/min. Detection was conducted with mobile wavelength at 30°C. Results: Good validation of the method including linearity, precision, repeatability, and recovery was performed. The contents of the studied analytes are significantly different, and resveratrol and rhein in particular existed in greater fluctuation among the samples. Conclusion: A simple, reliable, and sensitive method has been successfully established and applied to the analysis for simultaneous determination of the target compounds in 11 batches of samples. Highlights: Separation and quantitative analysis of two stilbenes and four anthraquinones from P. cuspidatum were developed by RP-HPLC. This method is convenient, sensitive, and accurate and can provide a reliable basis for further applications of P. cuspidatum in drug or food fields.

Determination of the geometric parameters of the matrix during the volumetric compression of tin bronze bushings

2021 ◽  
pp. 27-30
Author(s):  
Keyword(s):  
Plastic Deformation ◽  
Compression Ratio ◽  
Geometric Parameters ◽  
Degree Of Deformation ◽  
Deformation Parameters ◽  
Tin Bronze ◽  
The Matrix ◽  
Successful Reduction

The study of the influence of the geometric parameters of the matrix on the quality of the process of reduction of bushings made of tin bronze is carried out. It is established, that for successful reduction plastic deformation should not exceed 10÷15 %, and the angle of the intake part of the crimping matrix should be within 25÷45°, a further increase in this angle significantly reduces the quality of the process. It is shown, that the angle of the lead-in part of the crimping matrix has an insignificant influence on the limiting compression ratio of the bushings, and an increase in the friction coefficient does not significantly affect the deformation parameters. Keywords: bushing, crimping matrix, plastic deformation, compression ratio, wrinkling, degree of deformation [email protected]

Modelling of stresses and strains in two-layer combined materials at their formation

2019 ◽  
Vol 1-2 (97) ◽  
pp. 12-19
Author(s):  
G.M. Koloskova
Keyword(s):  
High Density Polyethylene ◽  
Bottom Layer ◽  
High Density ◽  
Bottom Plate ◽  
Distribution Dynamics ◽  
Polymer Metal ◽  
First Time ◽  
Practical Implications

Purpose: The aim of the represented study was to model the behaviour of two-layer combined material during its manufacturing. Design/methodology/approach: The model of material layers joining by means of calender method is built in LS-DYNA software on the basis of finite element method. Using the developed model the study of stress and strain condition changes is carried out. Numerical modelling was carried out for two types of two-layer combined materials in similar conditions. First combination was of high-density polyethylene top layer and aluminium foil bottom layer. Second combination was of high-density polyethylene top layer and low- density polyethylene bottom layer. Joining materials had equal thicknesses. Findings: During formation of two-layer combined materials the primary strain always occurs at the bottom plate of the bottom layer. However, the maximum plastic strain will be represented for the layer with lower elastic modulus value. At the point of the highest loading applied to the two-layer combined material the elasticity condition is changed to the plasticity one and the yield process is registered. Practical implications: Multi-layer combined materials are some of the most advanced types of materials. The quality of the joining of the layers, the strains and the stresses arising in their manufacturing process are the main causes of low interlayer strength. It leads to easy exfoliation and destruction of the material. The results of the study may be used to improve the quality of multi-layer combined materials. Originality/value: For the first time the model was developed for the determination of strains and stresses arising during the formation of multi-layer combined materials by means of calendering method. The calculations of the stresses and strains distribution dynamics for two-layer combined materials are represented for polymer-metal and polymer-polymer layers combinations. The results of the study may be of interest to specialists in the field of multi-layer combined materials designing and manufacturing.

scholarly journals Evaluation of the Quality of Service of Pedestrian Flows on a Signalized Intersections

2019 ◽  
Vol 65 (2) ◽  
pp. 37-42
Author(s):  
Vuk Bogdanović ◽  
Nemanja Garunović ◽  
Valentina Basarić ◽  
Jelena Mitrović Simić
Keyword(s):  
Quality Of Service ◽  
Signalized Intersections ◽  
Highway Capacity ◽  
Local Conditions ◽  
Highway Capacity Manual ◽  
Traffic Conditions ◽  
Novi Sad ◽  
First Time

In 5th edition of Highway Capacity Manual (2010) the methodology for evaluating the quality of service provided to pedestrians traveling through a signalized intersection first time was shown. The same methodology has been retained in the latest edition of the aforementioned manual. Provided methodology include determination of the key parameters for evaluation the quality of service of pedestrian flows on signalized intersections. In this paper mentioned methodology was shown through the short procedural steps. In order to verify the possibility of applying this procedure in local conditions, an analysis of traffic conditions at an intersection in Novi Sad was performed as an example.

scholarly journals Analyzing and Evaluating the Business Activity of Machine-Building Enterprises as the Basis for Increasing the Efficiency of Their Activities

2020 ◽  
Vol 11 (514) ◽  
pp. 230-240
Author(s):  
D. О. Zyz ◽  
Keyword(s):  
Control Systems ◽  
Machine Building ◽  
Organizational Control ◽  
Business Activity ◽  
Production Structure ◽  
Financial Condition ◽  
Technological Level ◽  
Scientific Technical ◽  
Building Enterprises

The article highlights the concept of business activity and the main tasks of analyzing and evaluating the business activity of machine-building enterprises. The directions of increasing business activity of enterprise are considered, which is achieved by a certain set of measures: acceleration of scientific, technical and organizational progress – by increasing the technical and technological level of production, organizational control systems, rapid updating of equipment; improvement of organizational structure – by reviewing the powers of each employee of the enterprise; improvement of production structure, in particular, increase of load and turnover coefficients – by increasing the volume of products; increasing the competitiveness of products and services – by improving the quality of goods produced and services provided; development and improvement of foreign trade of this enterprise – through establishing relations with neighboring countries. Evaluation and analysis of the main machine-building enterprises was carried out. The financial condition of machine-building enterprises and factors that lead to destabilization in the crisis situation is determined; the main goals of machine-building enterprises and the planning tools, which will allow management of the process of strategy implementation, are outlined.

scholarly journals DETERMINATION OF THE DYNAMIC TORQUE OF THE RESISTANCE OF THE DRIVE SHAFT OF THE REPLACING MACHINE FORMED BY THE MOVEMENT OF THE BULK ENVIRONMENT IN THE WORK TANK

2021 ◽  
Vol 297 (3) ◽  
pp. 94-99
Author(s):  
Mark ZALYUBOVSKYI ◽  
◽  
Viktor MALYSHEV ◽  
Igor PANASYUK ◽  
◽  
...  
Keyword(s):  
Machine Building ◽  
Drive Shaft ◽  
Dynamic Component ◽  
Sharp Edges ◽  
The Moment ◽  
Definition Of ◽  
Moment Of Resistance ◽  
Working Tank

Galvanizing technological operations include the processes of cleaning the surfaces of parts from burrs, burrs, bumps and scale, corrosion products, rounding of sharp edges, separation of parts from castings, as well as processes to improve the quality of product surfaces: grinding or polishing. These technological operations are implemented using different types of equipment: vibrating, rotary and spindle machines, rotating drums, etc. The most promising are considered to be machines with complex spatial movement of working tanks. Analytical researches of definition of dynamic moment of resistance of a driving shaft of the shredding machine on the basis of laws of movement of loose mass in the middle of working capacity are carried out. The positions of the moving parts of the machine and the bulk array in the middle of the tank, which correspond to the maximum dynamic component of the moment of resistance on the drive shaft created by the bulk array loaded to the working tank. An expression is obtained to calculate the value of the dynamic component of the moment of resistance on the drive shaft of the machine, created by the bulk array loaded to the working tank. The obtained research results can be used by the relevant machine-building enterprises at the stage of designing galvanizing types of equipment with tanks performing complex spatial motion.

scholarly journals RESEARCH OF A HIGHLY DEFECTIVE FROG CORE OF GRADE 1/9

2018 ◽  
Author(s):  
Pavels GAVRILOVS ◽  
Viktors IVANOVS
Keyword(s):  
Rail Steel ◽  
Steel Structure ◽  
Optical Emission ◽  
Research Process ◽  
Stage 4 ◽  
Stage 1 ◽  
First Time

For the first time at the Riga Technical University a study was carried out of a highly defective frog core of grade 1/9. In the course of the research an analysis of crossing piece defects on the Latvian railway was carried out in eight railway sections during years of 2015, 2016, 2017. The defect of the frog core of grade 1/9 (the 60 E1 DO 07 12 frog type) was considered according to the basic classification of the defects, and the analysis and research of the cause of its fracture were conducted from the bolt hole to the web and the base of the frog core. The research process consisted of four stages:  Stage 1: determination of metal hardness according to the Brinell scale with a modern device “Tinius O Olsen” Firmware Version 1.07, FH - 31 Series. The obtained results should be compared with the data of the manufacturer's factory – Dowlais Steel.  Stage 2: determination of the chemical composition of the rail steel of the frog core 1/9 (in the rail top, rail web, and rail base) using the ARC-MET 8000 Mobile Lab Optical Emission Spectometer Analyser. The obtained data should be compared with the manufacturer's data.  Stage 3: determination of the rail steel structure. Drawing of main conclusions about the quality of the rail steel of the frog core of grade 1/9.  Stage 4: drawing of main conclusions and summary of the cause and development of the fracture from the bolt hole of the frog core of grade 1/9.

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