scholarly journals Performance evaluation of high capacity mechanised dehusking equipment for green arecanut (Areca catechu L.)

2020 ◽  
pp. 126-136
Author(s):  
Ravindra Naik ◽  
R.H. Sadvatha ◽  
T. Senthilkumar ◽  
V. Balaji
Keyword(s):  
Performance Evaluation ◽  
Lower Cost ◽  
High Capacity ◽  
Speed Ratio ◽  
Shaft Speed ◽  
Total Cost ◽  
Entrepreneurship Development ◽  
Areca Catechu ◽  
The Many ◽  
Tooth Cutting

India is a major arecanut (Areca catechu L.) growing country. Of the many problems identified in arecanut processing, dehusking is found to be a major one, which is cumbersome and needs to be mechanised. Presently, there are a few types of equipments available, but these machines are basically of low capacity and cater to small arecanut growers. Performance evaluation of three high capacity green arecanut dehusking equipments was taken up, to work out its possible adoption for entrepreneurship development. Equipment under evaluation consisted of power mounted dehusker with hook tooth cutting blade fixed in a cutting wheel to dehusk the outer shell with a nut ejection system coupled with a vibrating deck of trays to grade and convey the dehusked nuts. The Blade-Knurl shaft speed ratio was optimised as 1:11. Whole nut recovery per cent ranged from 81.84 ± 1.87 to 82.52 ± 1.95 per cent. The unhusked per cent and partially husked percentage ranged from 7.60 ± 3.71 to 7.81 ± 4.68 and 8.29 ± 2.15 to 8.85 ± 2.82, respectively. The broken nut percentage ranged from 1.03 ± 1.36 to 2.06 ± 2.72 percentage. The total cost of operation for two-belt, four-belt and six-belt model was ` 162 h-1,` 237 h-1 and ` 262 h-1, respectively. Better dehusking efficiency with reduced damage to the nuts achieved in mechanical dehusking would enable the farmer to realise additional yield with saving in time and lower cost of operation.

A Theoretical Analysis of Floating Bush Journal Bearing With Axial Oil Film Rupture Being Considered

2002 ◽  
Vol 124 (3) ◽  
pp. 494-505 ◽  
Author(s):  
Kiyoshi Hatakenaka ◽  
Masato Tanaka ◽  
Kenji Suzuki
Keyword(s):  
Steady State ◽  
Reynolds Equation ◽  
Speed Ratio ◽  
Shaft Speed ◽  
Film Rupture ◽  
State Behavior ◽  
Oil Film ◽  
Rotordynamic Coefficients ◽  
The Stability ◽  
Very High

A new modified Reynolds equation is derived with centrifugal force acting on the hydrodynamic oil film being considered. This equation, together with a cavitation model, is used to obtain the steady-state equilibrium and calculate the rotordynamic coefficients of lightly loaded floating bush journal bearings operating at very high shaft speeds. The bush-to-shaft speed ratio and the linear cross-coupling spring coefficients of the inner oil film is found to decrease with the increase in shaft speed as the axial oil film rupture develops in the inner oil film. The present model can give reasonable explanation to the steady-state behavior and the stability behavior of the bearing observed in actual machines.

Improving the Fatigue Performance of Welded Tubular Connections via Flared and Thickened Pipe Ends

2021 ◽  
Author(s):  
Ghiath Guy Mansour
Keyword(s):  
Fatigue Life ◽  
Lower Cost ◽  
Fatigue Performance ◽  
Viable Alternative ◽  
Welding Time ◽  
Time Cost ◽  
Steel Catenary Risers ◽  
The Many ◽  
Espirito Santo

Abstract Fatigue is a primary challenge in the design of steel catenary risers (SCRs) and different measures and methods are utilized to mitigate it. Traditional upset ends and steel lazy wave risers (SLWRs) are such methods to mitigate fatigue. SLWRs were first used in 2009 on the Espirito Santo floating, production, storage, and offloading (FPSO) vessel of Shell Company's Parque das Conchas (BC-10) project offshore Brazil. SLWRs have been used increasingly since then and gained popularity especially in recent years. A novel patented tubular connection assembly referred to as Flared Thickened Ends (FTEs) improves the fatigue life of SCRs and welded connections in general. This novel assembly has many advantages. It overcomes the thickness limitation of welding traditional upset ends and reduces offshore welding time, cost, and risk. When FTEs are used in simple SCRs, they render simple SCRs a robustly viable alternative at significantly lower cost, shorter schedule, and with many additional advantages as compared to SLWRs. Of the many advantages, simple SCRs are more straightforward to configure, analyze, design, and install using varied installation methods and vessels. Simple SCRs use less materials and offer better long-term integrity, especially for insulated SCRs. In addition, they have a smaller footprint and are less prone to clashing than SLWRs.

Image Segmentation Based on Doubly Truncated Generalized Laplace Mixture Model and K Means Clustering

2016 ◽  
Vol 6 (5) ◽  
pp. 2188
Author(s):  
T Jyothirmayi ◽  
K Srinivasa Rao ◽  
P Srinivasa Rao ◽  
Ch Satyanarayana
Keyword(s):  
Image Segmentation ◽  
Performance Evaluation ◽  
Mixture Model ◽  
Gaussian Mixture ◽  
Medical Diagnostics ◽  
Major Drawback ◽  
Practical Applications ◽  
Global Consistency ◽  
The Many ◽  
Security Surveillance

The present paper aims at performance evaluation of Doubly Truncated Generalized Laplace Mixture Model and K-Means clustering (DTGLMM-K) for image analysis concerned to various practical applications like security, surveillance, medical diagnostics and other areas. Among the many algorithms designed and developed for image segmentation the dominance of Gaussian Mixture Model (GMM) has been predominant which has the major drawback of suiting to a particular kind of data. Therefore the present work aims at development of DTGLMM-K algorithm which can be suitable for wide variety of applications and data. Performance evaluation of the developed algorithm has been donethrough various measures like Probabilistic Rand index (PRI), Global Consistency Error (GCE) and Variation of Information (VOI). During the current work case studies forvarious different images having pixel intensities has been carried out and the obtained results indicate the superiority of the developed algorithm for improved image segmentation.

Performance Evaluation of Pumps in Air and Water

1968 ◽  
Vol 90 (2) ◽  
pp. 145-148
Author(s):  
Glenn M. Wood
Keyword(s):  
Reynolds Number ◽  
Performance Evaluation ◽  
Shaft Speed ◽  
Pump Performance ◽  
Tip Leakage ◽  
Leakage Flows ◽  
Significant Difference ◽  
Reynolds Number Effects ◽  
Tip Leakage Flows ◽  
Tip Shroud

To explore the feasibility of establishing pump performance in air, two different designs were tested over the same range of shaft speed and flow rate in both water and air. The larger unit of 3000-gpm capacity was of unshrouded design, whereas the smaller, 195-gpm capacity pump was fabricated with a full tip shroud on the impeller. Although similar trends in performance were observed for each pump tested in air and water, some dissimilarities were observed. In particular, the head rise characteristic curves for both pumps were noticeably higher in air than in water. This is contrary to trends predicted by Reynolds number effects and is apparently due to significant difference in the impeller tip leakage flows when pumping liquid or gas.

scholarly journals Performance Evaluation of New Adder Designed for Electronic Circuits

2019 ◽  
Vol 8 (3) ◽  
pp. 5039-5043
Keyword(s):  
Performance Evaluation ◽  
Power Consumption ◽  
Digital System ◽  
Efficient Design ◽  
Electronic Circuits ◽  
Parallel Prefix ◽  
The Many ◽  
Prefix Adder ◽  
Logic Unit

Arithmetic and Logic Unit (ALU) is the important module in any digital system utilized in the current world applications. Adder plays major role in the construction of any ALU. Multipliers can also be designed with the help of continuous addition. The efficient design of adders is very much needed for the efficient ALU design. Parallel prefix adder has been chosen in this research because of its fastest computation and efficiency. Kogge Stone, Sklansky, Ladner Fischer, Brunt Kung, Han-Carlson and Knowles are the adders discussed in this research. Further, the combinations of any two adders have also been tested for the best efficiency in terms of power consumption and delay utilisation. From the many combinations, it is found that the proposed combination of Bruntkung and SKlansky (BSK) adder performs excellent with the power consumption of 25011.22 nW and delay of 1243 pS.

scholarly journals Performance Evaluation of Four Wheel Tractor Driven High Capacity Combined Paddy Thresher

2011 ◽  
Vol 22 (3) ◽  
pp. 273 ◽  
Author(s):  
GVTV Weerasooriya ◽  
MHMA Bandara ◽  
M Rambanda
Keyword(s):  
Performance Evaluation ◽  
High Capacity
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