scholarly journals Development and Performance Evaluation of a Spring-Loaded Hand Operated Maize Sheller with Variable Mechanisms

2018 ◽  
Vol 15 ◽  
pp. 44-52 ◽  
Author(s):  
R. Segun Bello ◽  
C. Fabian
Keyword(s):  
Performance Evaluation ◽  
Moisture Content ◽  
Production Cost ◽  
Output Capacity ◽  
Corn Cobs ◽  
Machine Performance ◽  
Overall Performance ◽  
The Mean ◽  
And Performance ◽  
Mean Kernel

A spring-press, variable mechanism hand operated maize sheller was developed, constructed and tested with corn cobs at 12.6% moisture content, wet basis (w.b) and its shelling performances compared. The machine is lever operated with a spring load-return mechanism and a cob constrictor with changeable shelling mechanisms (spike tooth, rasp bar and star tooth), and a tilted tray for grain collection. The overall dimension of the machine is 520mm x 520mm x 400mm. The machine overall performance is 20.62kg/hr shelling capacity, 85.13% shelling efficiency and 2.13% kernel damage. Comparing the performance of the three shelling mechanisms; rasp bar, spike tooth and star tooth, shelling capacity (16.2, 26.0, 19.67) kg/hr.; shelling efficiency (82.22%, 87.19%, 85.97%); and % kernel damage (0.00, 0.74, 0.51) respectively, the star mechanism has a higher capacity of 26.0kg/hr. The mean kernel damage is higher for star tooth, whereas it is zero for rasp bar. In comparison with conventional hand-palm shelling method (100% shelling efficiency, 13.83kg/hr shelling capacity and 0% kernel damage), the hand operated sheller has a better output capacity, reasonable shelling efficiency but slightly higher kernel damage. By implication, machine performance efficiency does not give a true reflection of how effective a system work until the machine capacity is determined. The sheller ease household shelling maize for consumption with initial low production cost of N13, 100.00 (~$30).

Development and Performance Evaluation of Irish Potato Peeling Machine

2020 ◽  
pp. 11-23
Author(s):  
Ademola Olagoke Afolabi ◽  
Muhammad Lawal Attanda
Keyword(s):  
Performance Evaluation ◽  
Feed Rate ◽  
Irish Potato ◽  
Small Scale ◽  
Maximum Output ◽  
Household Level ◽  
Output Capacity ◽  
Randomized Design ◽  
And Performance ◽  
Potato Peeling

An Irish potato peeling machine was developed for use at small-scale/household level. Machine performance evaluation was carried out using three locally grown Irish potato varieties namely; Nicola, Bartita and Bawondoya respectively. A 22x3 factorial experiment in completely randomized design (CRD) with three replications was used for evaluation where tuber feed rate, shaft speed and variety were the independent variables and peeling efficiency, tuber flesh loss and machine output capacity were the performance indicators. Analysis of variance (ANOVA) results showed the effects of variety on peeling efficiency and feed rate on output capacity as highly significant (P=.01). Also, the interaction of speed and variety on peeling efficiency and the effect of variety on output capacity was significant (P=.05). The interaction of variety and speed at 480 rpm achieved a maximum mean peeling efficiency of 55.6% for Bawondoya. Similarly, at slightly higher speed of 510 rpm, the maximum mean peeling efficiency of 64.6% was achieved for Bartita. Flesh loss value of 0.84% was the least obtained and this was for Bartita while the highest flesh loss of 1.43% was observed for Nicola. At feed rates of 50 g/sec and 60 g/sec; the minimum and maximum output capacities of 31.3 kg/h and 59.2 kg/h were obtained respectively.

scholarly journals Design, Building and Performance Evaluation of a Mixed-Mode Solar Dryer for Agricultural Products

2020 ◽  
Vol 15 ◽  
Keyword(s):  
Performance Evaluation ◽  
Relative Humidity ◽  
Moisture Content ◽  
Ambient Temperature ◽  
Solar Collector ◽  
Mixed Mode ◽  
Ambient Air ◽  
Agricultural Products ◽  
The Third ◽  
And Performance

This research work presents the detailed explanation of the design, construction and performance evaluation of mixed-mode solar agricultural products dryer. The experimental set up used for testing the performance of the mixed-mode solar agricultural products dryer and determining the influence of various drying methods on the drying behaviour of agricultural products. Evaluation of the dryer was centered on the moisture content reduction, temperatures and relative humidities variations. 1680 g of freshly potato slides were used for evaluation. The test results gave that the temperatures inside the dryer cabinet and the solar collector were much higher than the ambient temperature during most hours of the daylight. The temperature inside the solar collector was up to 27 o C approximately higher than the ambient temperature. The temperature inside the drying cabinet was up to 22 o C approximately higher than the ambient temperature for about three hours immediately after 12.00 h (noon). The relative humidity in the solar collector and drying cabinet were lower than the ambient air relative humidity, with the ambient air recording the highest relative humidity at each reading followed by the drying cabinet and finally by the solar collector. Because of the decreased relative humidity inside the dryer, all the time, the temperature inside the dryer was high which is sufficient enough to dry the potato at an early time. Based on the results obtained during the test, temperature above 65 o C was recorded inside the drying cabinet. This high temperature in the drying cabinet causes 419 g of moisture to be removed on the first day, 257 g on the second day, 191 g on the third day, 136 g on the fourth day and finally 108 g on the fifth day. At the end of the five days of drying process, the mass of 1680 g of potato was reduced to 569 g. Total amount of moisture removed was 1111 g and total moisture loss was 66.1 %, which is the required amount of moisture to be removed for safe drying of freshly potato slides. The moisture content of the freshly potato slides was 24.9 % at the end of drying for the first day at about 5:00 pm, 20.4 % at the end of drying for the second day, 19 % at the end of drying for the third day, 16.7 % at the end of drying for the fourth day and finally 15.9% at the end of drying for the fifth day. It was observed that the drying rate increased from the end of one day to another, which shows the earlier and faster removal of moisture from the dried item.

scholarly journals Performance Evaluation of Solar Tunnel Dryer for Drying of Garlic.

2017 ◽  
Vol 5 (2) ◽  
pp. 212-218 ◽  
Author(s):  
Arjoo Arjoo ◽  
Yadvika Yadvika ◽  
Y.K. Yadaadav
Keyword(s):  
Performance Evaluation ◽  
Moisture Content ◽  
Thermal Efficiency ◽  
Initial Moisture Content ◽  
Drying Process ◽  
Tunnel Drier ◽  
Drying Time ◽  
Tunnel Dryer ◽  
Safe Level ◽  
And Performance

This paper presents dying efficiency and performance of the solar tunnel dryer for drying of garlic. The dryer is a tunnel like semi-cylindrical in shape, poly house made up of UV-stabilized polyethylene sheet. The capacity is large enough that it can be used to dry 400 kg of garlic under controlled environmental conditions. The temperature inside the dryer was always higher than the ambient and the variation varied from 8-30 ºC. Initial moisture content of garlic was reduced from 66 % (w.b.) to about 9 % (w.b.) in 9 days which is considered to be a safe level. During the drying process the average thermal efficiency of the drier was estimated to be about 13.45 %. Drying time was considerably reduced with the use of a solar tunnel drier and pressing of the sample. Also, the final dried garlic was found to be good in terms of quality and sensory evaluation shows that it is highly acceptable.

scholarly journals Fabrication and Performance Evaluation of Cowpea Thresher for Small Scale Cowpea Farm Holders in Nigeria

2018 ◽  
pp. 1-11
Author(s):  
O. W. Muhammed-Bashir ◽  
K. O. Oriola ◽  
B. A. Ogundeji ◽  
M. A. Adesokan
Keyword(s):  
Performance Evaluation ◽  
Study Design ◽  
High Efficiency ◽  
Throughput Capacity ◽  
Small Scale ◽  
Maximum Throughput ◽  
Sieve Size ◽  
Dimension Analysis ◽  
The Mean ◽  
And Performance

Aims: To develop and evaluate an affordable, accessible, easy-to-operate and functional small-scale thresher machine to make cowpea farming a profitable venture. Study Design: Fabrication and performance evaluation. Place and Duration of Study: Premises of DAF Technical Services, Ilorin, Nigeria, between June, 2017 and February, 2018. Methodology: Construction of a cowpea thresher machine was carried out by sizing and marking out the plate with the aid of scriber and cutter. The shaft was smoothened and the various components were welded and assembled with the aid of fasteners. The thresher was made-up of the feeding unit, which provided an opening through which the cowpea was introduced into the machine for threshing. As the various components of the cowpea thresher (threshing drum, the lower concave (screen), the spikes and separating unit) were being assembled, dimension analysis was carried out on two varieties of cowpea grains. This was meant to determine the screen sieve size. Results: Findings from this study indicated the mean cowpea grain threshing efficiencies of 71.40, 66.10, and 63.10% at a different speed of 472, 339, and 283 rpm respectively. The maximum throughput capacity (59.78 kg/hr) was obtained at threshing speed of 472 rpm. This revealed that as the speed decreased the threshing efficiency, the throughput capacity and grain loss also decreased, while damaged grains are negligible. Conclusion: The fabricated cowpea thresher is therefore, a suitable machine with high efficiency to carry out necessary small scale post-harvest operations in cowpea production.

Dynamic Modeling and Performance Evaluation of a Vibrating Cantilever Beam Microgyroscope

2005 ◽  
Author(s):  
Mehdi Esmaeili ◽  
Mohammad Durali ◽  
Nader Jalili
Keyword(s):  
Performance Evaluation ◽  
Dynamic Modeling ◽  
Input Parameter ◽  
Galerkin Approximation ◽  
Linear Functions ◽  
System Sensitivity ◽  
Beam Displacement ◽  
Overall Performance ◽  
And Performance ◽  
Tip Mass

This paper discusses the effects of substrate motions on the performance of microgyroscopes modeled as suspended beams with a tip mass. The substrate movements can be motions along as well as rotations around the three axes. Using Extended Hamiltonian Principle and Galerkin approximation, the equations of the motion of the beam are analytically derived. In these equations, the effects of beam distributed mass, tip mass, angular accelerations, centripetal and coriolis accelerations are clearly apparent. The effect of electrostatic forces inducing the excitation vibrations are considered as linear functions of beam displacement. The response of the system to different inputs is studied and the system sensitivity to input parameter changes are examined. Finally, the sources of error in the measurement of rotation rate input are recognized. The study demonstrated the importance of errors caused by cross axes inputs on the gyroscope output measurements and overall performance.

scholarly journals Performance Evaluation of a Centrifugal Peeling System for Pistachio Nuts

2011 ◽  
Vol 7 (4) ◽  
Author(s):  
Rasool Khodabakhshian ◽  
Mohammad Reza Bayati ◽  
Mohsen Shakeri
Keyword(s):  
Performance Evaluation ◽  
Moisture Content ◽  
Factorial Design ◽  
Optimization Technique ◽  
Base Plate ◽  
Peripheral Speed ◽  
Pistachio Nuts ◽  
Overall Performance ◽  
Four Levels ◽  
Circular Base

In this paper, performance evaluation of the centrifugal peeling system for pistachio nuts was studied as a function of moisture content (in five levels: 4.10, 10.50, 28.50 and 36.10 % d.b) and peripheral speed of separate rotating circular base – plate (in four levels: 35, 40, 45 and 50 m/s) in a factorial design based on completely randomized block. The overall performance was expressed in terms of peeling efficiency and breakage percent. Peeling efficiency and breakage increased with (i) increase in peripheral speed (ii) decrease in the pistachio moisture content. The results of an optimization technique revealed that the best peeling performance could be obtained if the machine is operated at peripheral speed of 50 m/s and moisture content of 4.10 % d.b. Under these conditions, the values of peeling efficiency and breakage percent were 96.5 and 8.7 %, respectively.

An integrated framework for supplier selection and performance evaluation for apparel retail industry

2021 ◽  
pp. 004051752199235
Author(s):  
Canan Sarıçam ◽  
Said Melih Yilmaz
Keyword(s):  
Performance Evaluation ◽  
Supplier Selection ◽  
Numerical Data ◽  
Critical Issue ◽  
Global Market ◽  
Integrated Framework ◽  
Overall Performance ◽  
And Performance ◽  
Qualitative Performance ◽  
Apparel Retailers

Supplier evaluation, including supplier selection and performance evaluation, has become a critical issue for apparel retailers within the apparel supply chain dealing with severe competition in the global market. An effective evaluation of suppliers requires considering both the quantitative and qualitative performance aspects and integrating the efficiency measurement. In an attempt to address this issue, this study proposes an integrated framework that can handle supplier selection and overall performance evaluation in a comprehensive but feasible manner. The proposed integrated framework customized for apparel retailers combines the current techniques having specific capabilities: data envelopment analysis (DEA), analytical hierarchy process (AHP), and the technique for order preference by similarity to ideal solution (TOPSIS). DEA has been used to make the overall performance evaluation, whereas AHP and TOPSIS have been used in combination to provide the quantitative data required by DEA. The proposed integrated framework was implemented and verified using numerical data gathered from a global apparel retailer. The findings revealed that suppliers can be more successful when they put a balanced effort into improving their performance in regards to the important criteria instead of concentrating on only the most important criterion. Moreover, the overall performance evaluation can be much more convenient and rewarding for apparel retailers in terms of finding out the true potential of suppliers when quantitative and qualitative data and efficiency measurements are taken into account at the same time.

scholarly journals Experiments and Performance Evaluation of a Transonic Axial Flow Turbine With Variable Nozzle

1986 ◽  
Author(s):  
Toshiyuki Takagi
Keyword(s):  
Performance Evaluation ◽  
Surface Pressure ◽  
Axial Flow ◽  
Prediction Method ◽  
Pressure Distributions ◽  
Wide Range ◽  
Overall Performance ◽  
Transonic Turbine ◽  
Loss Systems ◽  
And Performance

To examine extensively the overall performance of a single-stage transonic turbine under high-loading conditions, aerodynamic experiments were conducted over a wide range of stage pressure ratios up to 4.16. The measured performance is estimated by means of a mean-line prediction method with two loss systems and is discussed with radial variations and surface pressure distributions. The results show that airflow characteristics, loss systems and choking Mach numbers play an important role in evaluating the performance when choking occurs at either row.

scholarly journals Design and Construction of Densification Machine for Vegetables in Rural Settlements

2020 ◽  
pp. 48-55
Author(s):  
J. K. Agunsoye ◽  
I. Abubakar ◽  
S. I. Ogijo ◽  
A. Zakariyah ◽  
S. A. Okaiyeto
Keyword(s):  
Production Cost ◽  
Research Work ◽  
Storage Space ◽  
Hydraulic Jack ◽  
Rural Settlements ◽  
Compression Efficiency ◽  
Output Capacity ◽  
Machine Performance ◽  
Compression Plate ◽  
Dried Vegetables

This research work was carried out to improve the storage space and effective handling of dried vegetables specifically tomatoes, onion and okra, for consumers and marketers. The machine basically consists of an upper compression plate, machine mould, piston, lower compression plate and a 3-tons hydraulic jack. The machine performance was evaluated based on Output Capacity and Machine Compression Efficiency. The results showed that the machine output capacity and efficiency were 0.291 kg/h and 96.3%, respectively. The machine production cost stood at N35,000.00 only. The machine is therefore recommended to farmers.

scholarly journals Design, development and performance evaluation of small-scale fodder chopping machine for farmers

2021 ◽  
Author(s):  
Jannatul Ferdows Nipa ◽  
Md. Hasan Tarek Mondal ◽  
Md Atikul Islam
Keyword(s):  
Performance Evaluation ◽  
Energy Consumption ◽  
Small Scale ◽  
Design Development ◽  
Machine Performance ◽  
Machine Productivity ◽  
And Performance ◽  
One Year ◽  
Break Even Point ◽  
The Cost

A straw chopper is a mechanical device used to uniformly chop fodder into small pieces to mix it together with other grass and then feed it to livestock. The objective of this research was to design and develop an animal fodder chopping machine to be utilised by dairy farmers within their purchase range. The drawing of these machine parts was undertaken in AutoCAD software and the construction was performed in a local workshop. After development of this machine, performance tests were carried out on a farm. The chopping machine tests were carried out with commonly grown fodder (namely: straw, grass, and maize) in Bangladesh. The performance evaluation of the developed machine was carried out in terms of the chopping efficiency, machine productivity, and energy consumption. The economic analysis of the straw chopping machine was assessed by indicating the cost effectiveness to the poor farmers. Analysis of the data in regard to chopping efficiency and machine productivity varied from 93 to 96% and from 192 to 600 kg×h<sup>–1</sup>, respectively. The energy consumption during the chopping process ranged between 0.0025 and 0.01 kWh for the different types of fodder. The break-even point of the fodder chopping machine was 3 793 kg of cut straw and the payback period was within one year depending on the use.

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