scholarly journals Speed Adjustment on Variable Frequency Induction Motor Using PLC for Automatic Polishing Machine

2021 ◽  
Vol 3 (2) ◽  
pp. 70-75
Author(s):  
Agung Prasetyo Utomo ◽  
Anggara Trisna Nugraha
Keyword(s):  
Automatic System ◽  
Frequency Converter ◽  
Production Quality ◽  
Production Costs ◽  
Mechanical Equipment ◽  
System A ◽  
Automatic Polishing ◽  
Speed Regulator ◽  
System Improvement ◽  
Polishing Machine

PT. ROFENTI KARSA TAMA is a ceramic industry that produces products in the form of ceramics from natural stone which are addressed in Winong GEMPOL Village - MALANG. To produce a perfect ceramic process requires absolutely reliable electrical and mechanical equipment. In an automatic system a frequency converter is used as a speed regulator, because in a manual system using a grinder, the capacity is only 0.57Kw (kilowatts), and the production effect is not good. Therefore, the purpose of this study is to design an automatic polishing machine using a PLC-based converter. Based on the PLC, the capacity is 5 or 5 Kw (kilowatts). This system can increase ceramic output and improve quality. In this case, assuming that the operator usually uses an automatic system to complete the work of the three operators, the polishing machine production costs can be reduced. Through system improvement, production quality can be improved, manual polishing operators can only produce 480 pieces per day, while the automatic system can produce 1,536 pieces. One day, the polishing operator will save production costs of Rp 2.7 million per month.

SINGLE-MACHINE MULTIPLE-RECIPE PREDICTIVE MAINTENANCE

2013 ◽  
Vol 27 (2) ◽  
pp. 209-235 ◽  
Author(s):  
Yiwei Cai ◽  
John J. Hasenbein ◽  
Erhan Kutanoglu ◽  
Melody Liao
Keyword(s):  
Optimal Policy ◽  
Predictive Maintenance ◽  
Production Costs ◽  
Threshold Policy ◽  
Discrete Time Markov Chain ◽  
System A ◽  
Long Run ◽  
Monotonicity Result ◽  
Maintenance Policies ◽  
Discounted Costs

This paper studies a multiple-recipe predictive maintenance problem with M/G/1 queueing effects. The server degrades according to a discrete-time Markov chain and we assume that the controller knows both the machine status and the current number of jobs in the system. The controller's objective is to minimize total discounted costs or long-run average costs which include preventative and corrective maintenance costs, holdings costs, and possibly production costs. An optimal policy determines both when to perform maintenance and which type of job to process. Since the policy takes into account the machine's degradation status, such control decisions are known as predictive maintenance policies. In the single-recipe case, we prove that the optimal policy is monotone in the machine status, but not in the number of jobs in the system. A similar monotonicity result holds in the two-recipe case. Finally, we provide computational results indicating that significant savings can be realized when implementing a predictive maintenance policies instead of a traditional job-based threshold policy for preventive maintenances.

scholarly journals Evaluating the Impact of Starter Fertilizer on Winter Canola Grown in Oklahoma

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
M. Joy M. Abit ◽  
Katlynn Weathers ◽  
D. Brian Arnall
Keyword(s):  
Grain Yield ◽  
Nutrient Management ◽  
Climatic Conditions ◽  
Production Costs ◽  
Diammonium Phosphate ◽  
Winter Canola ◽  
System A ◽  
Management Recommendations ◽  
The Impact

Increased canola production costs and acres have driven Oklahoma (OK) farmers to ask more questions about their nutrient management recommendations in their production system. A study was conducted in 2011–2013 at Lahoma and Perkins, OK, to evaluate the effect of applying diammonium phosphate (DAP, 18-20-0:N-P-K) directly with seed on crop stand, grain yield, and grain quality of canola. In addition, the impact of proportion nitrogen (N) applied as a preplant and topdress was also evaluated. Diammonium phosphate was banded with the seed at planting at 0, 17, 34, 51, 67, and 84 kg DAP ha−1. Remaining N was applied as urea (46-0-0) either as split (40% preplant and 60% topdress) application or as topdress only. Stand count reduction of up to 71% was observed with seed-placed DAP. However, loss of stand did not impair grain yield due to canola’s ability to compensate for open areas via branching. Application of DAP of up to 84 kg ha−1 with seed may be possible; however, soil and climatic conditions should be considered when deciding how much DAP will be placed with seed. Moreover, when climatic conditions limit early season growth and favor late spring growth, applying all N at topdress (no preplant) tended to provide greater canola grain yield.

scholarly journals Swiss Learning Health System: A national initiative to establish learning cycles for continuous health system improvement

2018 ◽  
Vol 2 (3) ◽  
pp. e10059 ◽  
Author(s):  
Stefan Boes ◽  
Sarah Mantwill ◽  
Cornel Kaufmann ◽  
Mirjam Brach ◽  
Jerome Bickenbach ◽  
...  
Keyword(s):  
Health System ◽  
System A ◽  
Learning Health System ◽  
Health System Improvement ◽  
Learning Cycles ◽  
National Initiative ◽  
System Improvement

Wheel Based Temperature Measurement in Grinding

2011 ◽  
Vol 325 ◽  
pp. 3-11 ◽  
Author(s):  
Ekkard Brinksmeier ◽  
J. Eckebrecht ◽  
A. Wilkens
Keyword(s):  
Temperature Measurement ◽  
Optical Transmission ◽  
Thermal Damage ◽  
Research Work ◽  
Production Costs ◽  
Measuring System ◽  
Grinding Wheel ◽  
New Approach ◽  
System A ◽  
Chip Removal

The chip removal process in grinding is characterized by intensive friction and plastic deformation leading to the risk of thermal damage of the surface-layer of the machined part. Thus productive and reliable grinding processes need effective monitoring. The difficult to access contact zone between the grinding wheel and the workpiece led to extensive research work on the temperature measurement in the grinding arc. In order to develop a tool integrated temperature monitoring system a new approach was undertaken which makes use of the measurement of infrared-radiation to monitor the temperatures in the grinding arc. The presented research work shows promising results suitable for an industrial applicable system for temperature measurement in grinding. The optical transmission of the infrared temperature information in combination with a fast detecting infrared sensor bares the potential to establish a highly miniaturized measuring system which is easy to integrate in any grinding wheel at comparably low production costs.

Research on Low Cost Automatic Polishing Machine for Die/Mold Manufacturing

2012 ◽  
Vol 233 ◽  
pp. 177-180
Author(s):  
Jian Xin Liu ◽  
Jian Jun Lv ◽  
Ping Tan
Keyword(s):  
Low Cost ◽  
Force Sensor ◽  
Stone Tool ◽  
Proportional Valve ◽  
Pneumatic Control ◽  
Automatic Polishing ◽  
Automation Level ◽  
Polishing Machine ◽  
Compliant Actuator ◽  
Pneumatic Cylinders

In order to improve die/mold polishing worker’s environment and polishing automation level, we introduce a kind of low cost automatic polishing machine (LCAPM) with compliant actuator. The actuator is composed of a Tripod mechanism driven by pneumatic cylinders. Proportional valve is used to guarantee precision of cylinder’s position, and a 3D force sensor is used to adjust polishing contact force between grind stone tool and workpiece. Structure of LCAPM is described in detail; pneumatic control circuit and cylinder’s position are modeled in succession. Finally, a computing case of cylinder’s position for given workpiece is shown.

scholarly journals Improving Reliability and Energy Efficiency of Three Parallel Pumps by Selecting Trade-Off Operating Points

Mathematics ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1297
Author(s):  
Safarbek Oshurbekov ◽  
Vadim Kazakbaev ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii
Keyword(s):  
Energy Efficiency ◽  
Control Method ◽  
Frequency Converter ◽  
Operating Cycle ◽  
Pump System ◽  
Trade Off ◽  
Pumping System ◽  
System A ◽  
Operating Points ◽  
Maximum Reliability

Reliability, along with energy efficiency, is an important characteristic of pump units in various applications. In practical pump applications, it is important to strike a balance between reliability and energy efficiency. These indicators strongly depend on the applied control method of the pump unit. This study analyzes a trade-off method for regulating a system with three parallel pumps equipped with only one frequency converter (multi-pump single-drive system). A typical operating cycle of a pumping system with variable flow rate requirements is considered. The proposed trade-off method is compared with the traditional regulation, when a change in the operating point of the pump is achieved only by changing the rotation speed, and with the method for maximum reliability. It is shown that the proposed trade-off method makes it possible to ensure sufficient reliability of the multi-pump system operation without a significant increase in energy consumption.

scholarly journals Theoretical bases of managing agricultural production based on digital technologies

2020 ◽  
Vol 28 (1) ◽  
pp. 137-145
Author(s):  
Sergey A. Shelkovnikov ◽  
Marina S. Petukhova ◽  
Andrey A. Alekseev
Keyword(s):  
Agricultural Production ◽  
Production Management ◽  
Crop Yields ◽  
Digital Technologies ◽  
Production Costs ◽  
Production Cycle ◽  
Engineering Systems ◽  
Managerial Decision ◽  
System A ◽  
High Level

Digitalization affects all sectors of the economy, including agriculture. In addition, agriculture is a sector where the flow of data is very large and their digitization becomes a necessity for making optimal management decisions. The use of digital technologies in the industry is aimed at automating the maximum number of agricultural processes by creating a virtual model of the entire production cycle, and planning and forecasting with a high level of accuracy the schedule of work, crop yields, production costs and profits. Thus, digital technologies significantly change the process of managerial decision-making by the head of an agricultural organization. The purpose of this study is to develop the theoretical foundations of digital agricultural production management. The research methodology was based on monographic, abstract-logical, comparative methods. The study revealed that digitalization of agricultural production requires not only a complete change in production technology, but also a management system. A number of specific features inherent in the management of digital agricultural production are highlighted, which relate to the emergence of possibilities for modeling the production process, making changes to it and developing different scenarios; reducing the degree of influence on the production results of the climatic and human factors; guaranteed receipt of specified production parameters and the dependence of the vital activity of organisms on the work of engineering systems. In the context of digitalization of production, the functions of managing an organization undergo changes: in the framework of planning, which is generally carried out by a person, a significant role is given to forecasting, or rather, the development of scenarios for the possible development of production, which is already carried out by artificial intelligence. The latter also passes the function of monitoring production.

Optimal Fuel Cell System Design Considering Functional Performance and Production Costs

1997 ◽  
Author(s):  
Deyi Xue ◽  
Zuomin Dong
Keyword(s):  
Fuel Cell ◽  
Functional Performance ◽  
Design Method ◽  
Cost Optimization ◽  
Cell System ◽  
Production Costs ◽  
Fuel Cell System ◽  
Transportation Fuel ◽  
System A ◽  
Design Variables

Abstract In this work the optimization-based, integrated concurrent design method is extended to a general mechanical system — the transportation fuel cell system. A general optimal design model considering both functional performance and production costs is first introduced. Mathematical models of the functional performance and production costs of the Ballard fuel cell system are then discussed. A joint performance and cost optimization is carried out using the Ballard fuel cell system to demonstrate the approach. The optimization concurrently takes into account of two functional performance aspects and production costs to identify the optimal values of two key design variables. The work is a continuation of the authors’ earlier research on integrated concurrent engineering design.

Energy Saving Potential on Centrifugal Water Chillers with Frequency Converter System: A Case Study in China

2014 ◽  
Vol 1070-1072 ◽  
pp. 427-430
Author(s):  
Yuan Liu ◽  
Qi Wang ◽  
Pu Song
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Economic Performance ◽  
Frequency Converter ◽  
Industrial Enterprise ◽  
Variable Frequency ◽  
Energy Saving Potential ◽  
System A ◽  
Actual Operation

In order to evaluate the energy saving potential during centrifugal water chillers’ operation, centrifugal water chillers from an industrial enterprise in China are investigated. Based on the actual operation data gained from 3 different water chillers, their working performances and the energy consumption situations are reported and researched in this paper. Meanwhile, the energy saving potential and economic performance of the chillers are also reported and analyzed, when the appropriate variable frequency systems are introduced.

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