scholarly journals Improving of Green Sand-Mould Quality using Taguchi Technique

2021 ◽  
Author(s):  
Sampath Boopathi ◽  
Keyword(s):  
Complex Shape ◽  
Green Sand ◽  
Large Size ◽  
Parameter Variations ◽  
Significant Phenomenon ◽  
Minimum Number ◽  
Sand Mould ◽  
Maximum Permeability ◽  
Mould Casting

The green sand mould casting is an inevitable process to make large size and complex shape of the industrial components. The quality of green sand in mould is a significant phenomenon on casting quality. In this research, the number of ramming, sand thickness mould, and percentage of additives (western bentonite) mixing with sand have been considered to study the effects on permeability and hardness of mould by L27 orthogonal array. Greensand mould experiments have been conducted in the industry to observe the output parameter variations by Taguchi statistical analysis. It was revealed that the maximum permeability and minimum sand hardness have been obtained from the minimum number of ramming, thin sand thickness, and minimum mixing of additives in the sand. The confirmation tests were conducted to validate the predicted control parameter on responses.

scholarly journals Effects of seed tuber size on the yield and quality of seven accessions of potato

2019 ◽  
Vol 17 (2) ◽  
pp. 200-205
Author(s):  
Md. Murad Hossan Chowdhury ◽  
Md. Amirul Islam ◽  
Md. Atikuzzamman ◽  
Maria Akter Sathi ◽  
Sharmin Jahan
Keyword(s):  
Seed Tuber ◽  
Block Design ◽  
Average Diameter ◽  
Tuber Size ◽  
Stem Diameter ◽  
Large Size ◽  
Yield And Quality ◽  
Two Factors ◽  
Minimum Number

A field experiment was carried out at the Horticulture Farm, Bangladesh Agricultural University, Mymensingh during the period from November 2011 to February 2012 to study the effect of seed tuber size on the yield and quality of seven accessions of potato. The experiment was laid out in the Randomized Complete Block Design (RCBD) with three replications. This piece of research consisted of two factors namely, size of seed tubers i.e. three different size of seed tuber i.e. small (10-20 g), medium (21-30 g) and large (31-40 g) and seven accessions of potato i.e. AC10064, AC10076, AC10097, AC10109, AC10123, AC10190 and one check variety Cardinal. The size of individual plot was 1.8 m × 1.2 m. Two adjacent unit plots and blocks were separated by 0.5 m and 0.5 m. A spacing of 60 cm × 30 cm was also used in terms of planting. Data on different yield contributing characters and yield were recorded. The tallest plants were produced by the large size of seed tuber accession AC10109 (120.25 cm) which also took minimum time (6.10 days) to germinate and possessed maximum stem diameter (0.95 cm) while small seed tuber of Cardinal required maximum days (10.23 days) along with shortest height (60.22 cm) as well as stem diameter (0.65 cm). The large size seed tuber of accession AC10109 gave maximum number of main stems/hill (6.4) and small size of seed tuber variety Cardinal gave minimum number of main stems/hill (2.96). The large size of seed tuber accession AC10109 produced maximum number of compound leaves/hill (64.80) and the small size of seed tuber Cardinal produced minimum number of compound leaves/hill (35.74). In terms of yield character large size of seed tuber of AC10109 accession exhibited highest results in tuber number 9.60 with the average diameter of tubers (5.86 cm) and yield was 10.42 t/ha. The accessions differed significantly with respect to all the plant characters studied. J. Bangladesh Agril. Univ. 17(2): 200–205, June 2019

Reverse Modeling of Green Sand Mould System Using Fuzzy Logic-Based Approaches

2012 ◽  
Vol 12 (1) ◽  
pp. 1-16
Author(s):  
B. Surekha ◽  
Pandu R. Vundavilli ◽  
M. B. Parappagoudar
Keyword(s):  
Fuzzy Logic ◽  
Real Time Control ◽  
Green Sand ◽  
Time Control ◽  
System A ◽  
Sand Mould ◽  
Input Variables ◽  
Green Sand Mould System ◽  
Reverse Mapping

AbstractIn the present study, reverse mapping problems of green sand mould system have been solved using Fuzzy Logic (FL)-based approaches. It is a complicated process, in which the quality of the castings is influenced by the mould properties (that is, green compression strength, permeability, hardness and others). In forward modeling, the outputs are expressed as the functions of input variables, whereas in reverse modeling, the later are represented as the functions of the former. The main advantage of reverse modeling lies in the fact that it helps in effective real-time control of the process. This paper proposes three different FL-based approaches for the reverse modeling of the green sand mould system. A binary-coded Genetic Algorithm (GA) has been used to optimize the knowledge base of the FL-based approaches, off-line. The developed approaches are found to solve the above problem effectively, and the performances of the developed approaches are compared among themselves. It has been observed that the approach “Automatic design of FL system using GA” yielded much better results in predicting a set of input variables from the set of known set of output.

scholarly journals Statutory audit in Slovakia – significant phenomenon of global European changes

2020 ◽  
Vol 74 ◽  
pp. 06006
Author(s):  
Denisa Domaracká ◽  
Veronika Kňažková
Keyword(s):  
Financial Reporting ◽  
Global Economy ◽  
Financial Statements ◽  
Legislative Regulation ◽  
Significant Phenomenon ◽  
The Subject ◽  
The Impact ◽  
Regulation Changes ◽  
Audit Performance

The changing global economy environment also affected the area of statutory audit. Nowadays, statutory audit faces the significant changes not only because of the processes of digitization and automation in accounting and auditing, but because of increased and tightened legislative regulation, too. The most important aspects of financial reporting and auditing are subject to EU Regulations and EU Directives. For this reason, the issue of legislative regulation changes in field of statutory audit in Slovakia has become the subject of our article. Currently, the proposal of amending and supplementing Act. No 431/2002 Coll. on Accounting, as amended underwent an interdepartmental comment procedure. The proposal includes the changes on requirements for statutory audit. This article examines the current proposal to change (mainly increase) the conditions for performing the mandatory statutory audit of financial statements in Slovak audit environment. Our goal is to clarify the reasons and implications behind the changes of Slovak legislation as well as the impact of these changes on audit performance in Slovakia. We believe conducting statutory audits in accordance with the applicable legislation accepted and implemented at international European level can contribute to transparency and improve the quality of audit performance. In order to achieve the goal, it was necessary to choose a purposeful work methodology and research methods.

Allocating nodes to hubs for minimizing the hubs processing resources: A case study

2019 ◽  
Vol 53 (3) ◽  
pp. 807-827
Author(s):  
Ali Balma ◽  
Mehdi Mrad
Keyword(s):  
Telecommunication Network ◽  
Real Life ◽  
Optimal Solutions ◽  
Total Flow ◽  
Nonlinear Formulation ◽  
Large Size ◽  
Processing Resources ◽  
Reformulation Linearization

This paper addresses the problem of allocating the terminal nodes to the hub nodes in a telecommunication network. Since the flow processing induces some undesirable delay, the objective is to minimize the total flow processed by the hubs. This study focuses on a real life network of the tunisian operator Tunisie Telecom whose operations managers are concerned by the quality of service. We provide three compact formulations that give optimal solutions for networks of large size. In particular, the last two are obtained by applying the Reformulation-Linearization Technique to a nonlinear formulation of the problem. The latter formulation derived within this approach is the most computationally effective, as pointed out by the computational experiments conducted on the real life network of Tunisie Telecom with 110 nodes and 5 hubs. Finally, we discuss and compare between the single allocation and double allocation configurations.

Research on trajectory planning of non-developable surface for automated tape placement processing of composite

2017 ◽  
Vol 24 (6) ◽  
pp. 929-936
Author(s):  
Lin Liu ◽  
Jun Xiao ◽  
Yong Li
Keyword(s):  
Trajectory Planning ◽  
Local Stress ◽  
Developable Surface ◽  
Software Environment ◽  
Quantitative Characterization ◽  
Large Size ◽  
Variable Step ◽  
The Cost ◽  
Wing Panel

AbstractTape placement manufacturing process, as one of the automated forming technologies for composite material, not only substantially improves the productivity of composite component and reduces the cost of production significantly but also raises the reliability and stability of composite structure. Automated tape placement technology is mainly applied for manufacturing the fuselage and wing panel of airplane characterized by small curvature and large size. For these kinds of structural components with a non-developable surface, trajectory planning by “natural path” method could reduce the internal stress and improve the quality of composite products to a certain extent but not be optimized by quantitative characterization. On the basis of preliminary work, the theoretical model of “unnatural degree” (UD) is introduced in the first step, which could characterize the tensile and shear strain of the laying tape quantitatively. Secondly, by adjusting the iterative step and laying direction to diminish the UD, local stress could be softened in order to optimize the laying track. Ultimately, the simulation model of the non-developable surface is established under the Matlab software environment, and the “variable step-angle” algorithm is adopted to verify the adjustment effect of the tape-laying track.

Метод и аппаратура инфракрасного и ультразвукового термографического контроля крупногабаритных композиционных изделий сложной формы

2021 ◽  
Vol 7 ◽  
pp. 67-74
Author(s):  
А.О. Чулков ◽  
Д.А. Нестерук ◽  
Б.И. Шагдыров ◽  
В.П. Вавилов
Keyword(s):  
Neural Network ◽  
Nondestructive Testing ◽  
Data Fusion ◽  
Defect Detection ◽  
Complex Shape ◽  
Reference Sample ◽  
Robotic System ◽  
Image Stitching ◽  
Large Size ◽  
Thermal Nondestructive Testing

A robotic system for combined thermal nondestructive testing of large-size parts, including data fusion, is described. The efficiency of combining results of infrared (IR) and ultrasonic IR thermographic inspection has been demonstrated on a complex-shape reference sample containing 18 surrogates of manufacture and in-service defects. The data fusion algorithms including IR image stitching in space and automated defect detection and characterization by using a neural network have demonstrated efficiency of the proposed approach in practical testing.

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