scholarly journals Simulation of control and stabilization of the lubricant-coolant flow

2021 ◽  
Vol 2131 (2) ◽  
pp. 022014
Author(s):  
D Gladckih ◽  
S Studennikova
Keyword(s):  
Control System ◽  
Flow Rate ◽  
System Simulation ◽  
Drill Hole ◽  
Cutting Fluid ◽  
Cooling Fluid ◽  
Proposed Model ◽  
Cutting Zone ◽  
The Subject

Abstract The subject of the research is a control system of coolant supply. The results of system simulation in MathLab application program package for solving problems of technical calculations are presented and the analysis of transients is carried out. Reliability and productivity of a machine tool module depends on the quality of coolant supply control. This problem is actual for CNC machines, used for drilling holes with hard-alloy drills. of cutting fluid through the cutting zone depends on the state of chips in the drill hole channels. In the article the simulation of pump control as a function of changing flow rate is performed. The conclusion of the conducted research is the proposed model of the system of supply and flow of lubrication-cooling fluid, which allows analyzing the performance of the object under study.

scholarly journals The future of organic farming – reflections on the new legislation

2020 ◽  
pp. 79-89
Author(s):  
Katarzyna Leśkiewicz
Keyword(s):  
European Union ◽  
Control System ◽  
Organic Farming ◽  
Union Member ◽  
Organic Production ◽  
Positive View ◽  
Organic Products ◽  
The Subject ◽  
European Union Member States

The purpose of the considerations is, taking into account the scope of derogations from the requirements of organic production and the competence of certifying authorities, to answer the question whether in comparison to Regulation No 834/2007, new Regulation No 2018/848 serves to ensure the quality of organic products. The authoress takes a positive view on limiting possible exemptions from the requirements of organic production to natural disasters and linking them to the provisions on rural development. At the same time she expresses a negative opinion on the possibility of seeking exemption from the requirement to obtain certificates. In relation to the competences of the certifying authorities, the new Regulation retains a greater terminological precision in determining the subject of control and certification and defines more precisely the criteria for delegating tasks in the organic farming control system to institutions. This issue, however, needs to be detailed in the legislations of European Union Member States.

Caprolon turning with the supply of a water repellent emulsion to the cutting zone

2021 ◽  
Author(s):  
Keyword(s):  
Surface Roughness ◽  
Water Absorption ◽  
Chip Formation ◽  
Cutting Fluid ◽  
Water Repellent ◽  
Machined Surface ◽  
Water Emulsion ◽  
Cutting Zone

The turning of caprolon with the use of cutting fluid is investigated. It is established that when turning with a simultaneous supply of a water emulsion of a water repellent to the cutting zone, the water absorption of caprolon decreases and the quality of the machined surface increases. Keywords: caprolon, turning, water absorption, water repellent emulsion, surface roughness, chip formation. [email protected]

Flight Control System for UAV Based on Simulink

2013 ◽  
Vol 709 ◽  
pp. 662-666 ◽  
Author(s):  
Guo Dong Jin ◽  
Li Bin Lu ◽  
Juan Liang ◽  
Xiao Fei Zhu
Keyword(s):  
Control System ◽  
Flight Control ◽  
Simulation Training ◽  
Least Squares Method ◽  
System Simulation ◽  
Training System ◽  
Theory And Practice ◽  
Flight Control System ◽  
Flight Parameters

Most UAV flight control system simulation was used for evaluating the quality of UAV and designing it, however, the results failed to conform to actual flight laws. According to the need of UAV simulator in actually, a new way which was convenient for engineering computing and appropriated for simulation training was built for simulating flight control system. With the actual flight figures, flight parameters were modified by Least squares method curve fitting. The system offers a way for developing UAV simulation training system, thus of great value in both theory and practice.

Resistance Balance Simulation of Centralized Air Supplying and Dust Removing System for Cigarette Making and Tipping Machines

2014 ◽  
Vol 8 (1) ◽  
pp. 94-103
Author(s):  
Zhang Xinqiao ◽  
Chen Feihu
Keyword(s):  
Energy Consumption ◽  
Simulation Model ◽  
Flow Rate ◽  
System Simulation ◽  
Ventilation System ◽  
Energy Saving Potential ◽  
System A ◽  
Operating Stability ◽  
The Matrix

The operating stability of centralized air supplying and dust removing system (CASDRS) is the guarantee of efficiency and the quality of the cigarette making process. The pressure changing in the network, the value of the flow rate of the branch and especially the system resistance balance are the main evaluate indexes of the system. In this paper, a simulation model of CASDRS is built, as an evaluate tool of the system to analyze stability and energy saving potential. The simulation toolbox MATLAB/simulink is employed to analysis the resistance balance of the system, a pipe-net model is developed to the ventilation system. Through the connection of the blocks in the simulink toolbox, the operation of the matrixes which including constraining parameter input matrixes, the connection of the matrix and the calculation of the element of the matrix and the matrix itself, the system simulation model is obtained. The sensitivity result is given as the input parameters varied hourly and the result about energy consumption is more accurate.

Pengaruh Kualitas Sumber Daya Manusia, Pemanfaatan Teknologi Informasi, Dan Sistem Pengendalian Intern Terhadap Ketepatwaktuan Pelaporan Keuangan Pemerintah Desa

2018 ◽  
Vol 26 (2) ◽  
pp. 131-143
Author(s):  
Marlinawati Marlinawati ◽  
Dewi Kusuma Wardani
Keyword(s):  
Information Technology ◽  
Control System ◽  
Human Resources ◽  
Financial Reporting ◽  
Internal Control ◽  
Positive Influence ◽  
Internal Control System ◽  
Speed Up ◽  
Village Government

The purpose of this research is to know the influence between the Quality of Human Resources, Utilization of Information Technology and Internal Control System Against Timeliness of Village Government Financial Reporting at Gunungkidul Regency. This research is causative research. The population is the village government in Gunungkidul Regency, especially in Gedangsari subdistrict. Criteria of respondents in the study were to village and village apparatus. We use questionnaire to collect data. We use multiple regression with SPSS program version 16.0 to analyze data. We find that quality of human resources and internal control system have a positive influence on the timeliness of village government financial reporting. On the other hand, utilization of information technology does not influence the timeliness of village government financial reporting. These imply that the quality of human resources and internal control system can speed up the preparation of village government financial reporting.

Measuring Service Quality in The Context of Higher Education in Vietnam

2013 ◽  
pp. 77-90
Author(s):  
Yen Nguyen Thi Hoang
Keyword(s):  
Higher Education ◽  
Service Quality ◽  
Exploratory Study ◽  
Measurement Scale ◽  
Education Service ◽  
The Subject

This paper focuses on the understanding of service quality in the context of Vietnamese universities. It proposes an approach for measuring the quality of the higher education service provided by universities in Vietnam. Firstly, an exploratory study was conducted. Then, the set of items which were generated became the subject of a questionnaire that was then administered to 675 students of a Vietnamese university to determine the dimensions of higher education service quality in this context. The obtained results permit us to appropriate a measurement scale which is slightly different from the SERVQUAL scale widely known as the standard for measuring service quality. The results also show that tangible elements, responsiveness and assurance seem to be three specific dimensions of the higher education service of Vietnamese universities.

DESIGN, SIMULATION AND IMPLEMENTATION MONITORING SYSTEM FOR SYSTEM CONTROL C4 FEEDING PUMP FOR FEED VAPORIZATION IN THE BUTADIENE PLANT

2020 ◽  
Vol 1 (1) ◽  
pp. 31-35
Author(s):  
Fahmi Yunistyawan ◽  
Yunistyawan J Berchmans ◽  
Gembong Baskoro
Keyword(s):  
Motor Control ◽  
Control System ◽  
Field Operator ◽  
System Control ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Software And Hardware ◽  
Discharge Pressure ◽  
Selection Of

This study implements the auto start control system on an electric motor 3 phase C4Feeding pump when the discharge pressure is low-low (4.3 kg /cm²). The C4 feeding pumpmotor was initially manually operated from the local control station, this was very ineffectiveand inefficient because it still relied on the field operator to operate the pump motor and whenthe plant was in normal operating it is very risk if the field operator late to operate motor then itwill impact to quality of the product, and if the delay time to operate motor is too long then planthave to shut down, therefore improvement is needed in the C4 feeding pump motor controlsystem. In this paper, various types of 3-phase motor control are explained which allow it to beapplied to the C4 feeding pump motor that are on-off, inverter, and variable speed drive andefficient selection of the three systems control of the motor. Software and hardware used in thisthesis work are DCS CENTUM VP Yokogawa.

Thomas More’s Correspondence in a Spanish Ambiance

Moreana ◽  
2002 ◽  
Vol 39 (Number 149) (1) ◽  
pp. 41-60 ◽  
Author(s):  
Eugenio M. Olivares Merino
Keyword(s):  
The Subject ◽  
Selection Of

The recent reprinting of Álvaro de Silva’s 1998 edition of a selection of More’s letters prompts the author to examine the subject of Spanish translations of More, and of de Silva’s general commentary on More’s correspondence and on his relationship to other humanists. The author reflects on aspects of More’s personality as exposed in his letters and uses what he finds as a corrective to several biographical misconceptions. He points out the strengths and weaknesses of de Silva’s work and compares it with that of other translators, particularly Elizabeth Rogers, and notes the particularly Spanish quality of de Silva’s edition.

An Experimental Investigation on Thermal Conductivity and Viscosity of Graphene doped CNTs /TiO2 Nanofluid

2020 ◽  
Vol 17 (3) ◽  
Author(s):  
A.M. Zetty Akhtar ◽  
M.M. Rahman ◽  
K. Kadirgama ◽  
M.A. Maleque
Keyword(s):  
Thermal Conductivity ◽  
Zeta Potential ◽  
Base Fluid ◽  
Minimum Quantity Lubrication ◽  
Cutting Fluid ◽  
Cutting Zone ◽  
Observation Method ◽  
The Stability ◽  
The Relationship ◽  
Zeta Potential Analysis

This paper presents the findings of the stability, thermal conductivity and viscosity of CNTs (doped with 10 wt% graphene)- TiO2 hybrid nanofluids under various concentrations. While the usage of cutting fluid in machining operation is necessary for removing the heat generated at the cutting zone, the excessive use of it could lead to environmental and health issue to the operators. Therefore, the minimum quantity lubrication (MQL) to replace the conventional flooding was introduced. The MQL method minimises the usage of cutting fluid as a step to achieve a cleaner environment and sustainable machining. However, the low thermal conductivity of the base fluid in the MQL system caused the insufficient removal of heat generated in the cutting zone. Addition of nanoparticles to the base fluid was then introduced to enhance the performance of cutting fluids. The ethylene glycol used as the base fluid, titanium dioxide (TiO2) and carbon nanotubes (CNTs) nanoparticle mixed to produce nanofluids with concentrations of 0.02 to 0.1 wt.% with an interval of 0.02 wt%. The mixing ratio of TiO2: CNTs was 90:10 and ratio of SDBS (surfactant): CNTs was 10:1. The stability of nanofluid checked using observation method and zeta potential analysis. The thermal conductivity and viscosity of suspension were measured at a temperature range between 30˚C to 70˚C (with increment of 10˚C) to determine the relationship between concentration and temperature on nanofluid’s thermal physical properties. Based on the results obtained, zeta potential value for nanofluid range from -50 to -70 mV indicates a good stability of the suspension. Thermal conductivity of nanofluid increases as an increase of temperature and enhancement ratio is within the range of 1.51 to 4.53 compared to the base fluid. Meanwhile, the viscosity of nanofluid shows decrements with an increase of the temperature remarks significant advantage in pumping power. The developed nanofluid in this study found to be stable with enhanced thermal conductivity and decrease in viscosity, which at once make it possible to be use as nanolubricant in machining operation.

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