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Research on the Stability of Circuit Breaker Based on Sinusoidal Excitation
Issue:
Volume 2, Issue 3, September 2017
Pages:
53-57
Received:
28 February 2017
Accepted:
16 March 2017
Published:
7 April 2017
DOI:
10.11648/j.es.20170203.11
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Abstract: With the rapid development of new technology of electrical, all walks of life to the reliability of low voltage circuit breaker and other electronic products requirements are increasingly demanding, low voltage circuit breaker as the main electrical equipment in the power distribution system to connect to the circuit and disconnect plays a decisive role in the railway road, maritime transport, strong shock and vibration. Natural mechanical environment has become one of the important factors affecting the safe operation of electrical equipment is stable and reliable. The circuit breaker is generally under static conditions to study the performance index, this paper circuit breaker on-off of dynamic reliability experiment, build platform, find the circuit breaker on-off phase Should the parameters (frequency, acceleration). This paper adopts Es-60Wls3-445/LT0606/LTT1212 electric vibration system stability test sine on SIEMENS 3VL2716-1AA33-0AA0 molded case circuit breaker, and to study its stability.
Abstract: With the rapid development of new technology of electrical, all walks of life to the reliability of low voltage circuit breaker and other electronic products requirements are increasingly demanding, low voltage circuit breaker as the main electrical equipment in the power distribution system to connect to the circuit and disconnect plays a decisive...
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CFD Study to Enhance the Heat Transfer in Heat Exchanger by Change the Outer Surface of the Inner Tube and Use Nano Fluid
Zena K. Kadhim,
Safaa Abed Mohammad
Issue:
Volume 2, Issue 3, September 2017
Pages:
58-68
Received:
21 February 2017
Accepted:
6 March 2017
Published:
19 April 2017
DOI:
10.11648/j.es.20170203.12
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Abstract: In the present work the analysis of three different copper tubes (smooth tube, two corrugated tubes with corrugated ratio (z/d=1 and 0.5)) in a shell and tube heat exchanger done by ANSYS FLUINT14.0. This work deals with theoretical investigation was to evaluate the benefit of changing the shape of inner tube in the heat exchanger and the improving the heat transfer using water as the working fluid in the first case, then using a Nano fluids as a heat transfer working fluid. The conditions used in the simulation are in the two case the hot side flow rate range from (1 to 5 LPM) with three different temperature (40, 50 and 60°C). The cold side flow rate range (3 to 7LPM) for water and (3.2 to 7.2LPM) for nano fluid because of the change in density by added nanoparticles and at 25°C for the two cases. The simulation show results of enhancement in heat transfer rate ranging from (58.24% to 59.55%) at a temperature of 40°C, (55.62% to 58.09%) at a temperature of 50°C and (54.44% to 59.17%) at a temperature of 60°C, for both corrugated tubes with respect to smooth tube by used water as cooling fluid. By using Nano- fluid the enhancement in heat transfer are (60.14% to 61.44%) at a temperature of 40°C, (58.36% to 62.01%) at a temperature of 50°C and (56.46% to 63.15%) at a temperature of 60°C, for both corrugated tubes with respect to smooth tube.
Abstract: In the present work the analysis of three different copper tubes (smooth tube, two corrugated tubes with corrugated ratio (z/d=1 and 0.5)) in a shell and tube heat exchanger done by ANSYS FLUINT14.0. This work deals with theoretical investigation was to evaluate the benefit of changing the shape of inner tube in the heat exchanger and the improving...
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Analysis of Landsat 8 Multispectral Satellite Imagery for the Identification of Rock-Based Archaeological Sites in India
Bhooma Srinivasan,
Friedrich Teichmann
Issue:
Volume 2, Issue 3, September 2017
Pages:
69-77
Received:
28 March 2017
Accepted:
13 April 2017
Published:
31 May 2017
DOI:
10.11648/j.es.20170203.13
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Abstract: Despite the fact that highly intriguing, historical and world famous architectures are all carved out of rocks or made up of stones, there has been a continuous vacuum in the academic literature for the stone artefacts that requires investigation regarding the spectral response curve or a specific bandwidth to identify structures made up of rocks. Therefore, this research throws some light on the rock-cut caves and sculptures which stand as a heritage monument in many places in and around India by incorporating the multispectral Landsat satellite imagery. This paper aims to corroborate a methodology to find rocks using a discrete Landsat satellite band that would highlight rock based structures from various land cover backgrounds retrieved by multispectral remote sensing methodology. Four different non-examined and two well-known archaeological sites are taken as case studies to analyze and average across the study area samples for best results. Withal it is essential to understand that this research outcome will provide a comprehensive overview of the interesting observations obtained by Landsat satellite imagery with comparatively limited spatial resolution.
Abstract: Despite the fact that highly intriguing, historical and world famous architectures are all carved out of rocks or made up of stones, there has been a continuous vacuum in the academic literature for the stone artefacts that requires investigation regarding the spectral response curve or a specific bandwidth to identify structures made up of rocks. ...
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The Calculation of the Spare Parts in the Auto-service Enterprise on the Base of Real Demand
Dyshin Oleq Aleksandr,
Karimov Nijat Ashraf
Issue:
Volume 2, Issue 3, September 2017
Pages:
78-84
Received:
21 May 2017
Accepted:
12 June 2017
Published:
14 July 2017
DOI:
10.11648/j.es.20170203.14
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Abstract: The main goal of the work is the development of a methodology for calculating the spare parts of cars in a service center for the period of replenishment of spare parts, tools, accessories, the English version - spare parts, instruments, accessories - SPIA on the basis of analysis of statistical information on the failures of the details of each standard. This information should be accumulated on daily information about the replacement of spare parts of failed parts in vehicles that arrived during the entire period of replenishment for maintenance at this service station. Previously, from the totality of a finite number of competing hypotheses about a possible theoretical parametric distribution of failures (including diffusion distributions), the distribution function most consistent with the empirical distribution function is chosen by Kolmogorov-Smirnov's agreement criterion. When calculating the failure distribution function in the theory of system reliability, information is usually used about the main characteristic of failures-the time between failures, and in the absence of such information, they use the number of failures at certain points in time. To this end, the relationship between the expressions for the distribution function of the operating time to a fixed number of failures and the function of the distribution of the number of failures for a fixed operating time to failure is established in this paper. This makes it possible to calculate the planned need for spare parts on the basis of the available statistics of failure of parts (and replacement of their corresponding spare parts) in previous planning periods. Given that fatigue wear of one part, even before its complete failure, can diffusively affect the performance of other car parts, in the aggregate of competing functions for the distribution of failures of parts included diffusion monotonic (DM) and diffusion no monotonic (DM). The proposed methodology is approved for the calculation of spare parts for individual component sizes and, in general, for any car parts by the example of a particular auto service company in the replenishment period of the SPIA equal to one calendar month.
Abstract: The main goal of the work is the development of a methodology for calculating the spare parts of cars in a service center for the period of replenishment of spare parts, tools, accessories, the English version - spare parts, instruments, accessories - SPIA on the basis of analysis of statistical information on the failures of the details of each st...
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