scholarly journals Performance Testing and Evaluation of Drum-Type Stem-Separation Device for Pepper Harvester

2021 ◽  
Vol 11 (19) ◽  
pp. 9225
Author(s):  
Seo-Yong Shin ◽  
Myoung-Ho Kim ◽  
Yongjin Cho ◽  
Dae-Cheol Kim
Keyword(s):  
Rotational Speed ◽  
Separation Efficiency ◽  
Performance Testing ◽  
Performance Tests ◽  
Separation Device ◽  
Damage Rate ◽  
Separation Capacity ◽  
And Performance ◽  
Separation Devices ◽  
Additional Labor

The chili pepper harvester has shown potential problems of low pepper stem separation and a high pepper damage rate. The low pepper stem separation has required additional labor, which consists of separating the pepper and stem after pepper harvesting. To improve the stem separation and sorting function of pepper harvesters, three-shaft and four-shaft drum-type stem-separation devices were manufactured, and performance tests were conducted to assess these devices. In an attempt to reduce the damage rate, a brush was used as the teeth in the drum-type stem-separation device. In the factor test, the rotational speeds of shaft 1(A), shaft 2(B), shaft 3(C), and the conveyor for the three-shaft drum were 0.9, 2.7, 1.3, and 0.5 m/s, respectively. The rotational speed of the four-shaft drum was the same as that of the three-shaft drum except for shaft 4(D), and the rotational speed of this additional D was set to 1.3 m/s, which was the same as that of C. In the non-moving status during the non-picking operation of the pepper harvester, the average stem-separation efficiency (SSE) of the four-shaft drum increased by 1.2%, the average pepper with twig rate (PTR) decreased by 5.9%, and the average damage rate (DR) increased by 3.7% compared to the three-shaft drum. In the moving status during the picking operation of the pepper harvester, the SSE of the four-shaft drum increased by 3.6%, the PTR decreased by 9.1%, and the DR increased by 3.8% compared to the three-shaft drum, so an improvement in the pepper stem-separation capacity was observed.

Performance Assessment in Language Testing

1995 ◽  
Vol 15 ◽  
pp. 188-211 ◽  
Author(s):  
Elana Shohamy
Keyword(s):  
Performance Assessment ◽  
Theory Development ◽  
Performance Testing ◽  
Language Testing ◽  
Performance Tests ◽  
The Past ◽  
Major Shift ◽  
And Performance

In the past two decades, there has been a major shift in language testing towards the development and use of performance tests. The basis for this shift is the expectation that such tests would assess a more valid construct of what it really means to know a language. The purpose of this chapter is to review th topic of performance testing by focusing on its definitions, theory, development, and research. The chapter will begin with a review of the different definitions of performance testing and provide examples of the types of performance tests that have been developed and used. The chapter will then examine the extent to which performance tests have drawn upon the theoretical discussions of competence and performance. The next section will describe the research that has been carried out on performance tests. The chapter will end with an agenda for development and research on the manyu unanswered questions concerning performance testing.

scholarly journals Design and Performance Evaluation of a Cherry Tomato Calyx Remover

2021 ◽  
Vol 11 (22) ◽  
pp. 11016
Author(s):  
Yeongsu Kim ◽  
Seokho Kang ◽  
Hyunggyu Park ◽  
Seungmin Woo ◽  
Daniel Dooyum Uyeh ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Optimal Design ◽  
Removal Rate ◽  
Performance Tests ◽  
Cherry Tomato ◽  
Design Factor ◽  
Tomato Variety ◽  
Damage Rate ◽  
And Performance

A prototype for the remover of cherry tomato calyxes was designed and manufactured. The tap remover was designed and manufactured considering the conveyor transport speed, brush length and clearance, and diameter. These were adjusted in three levels to determine the optimal design factor. Performance tests were conducted using Icon 513, a circular-shaped cherry tomato variety, and Minimaru, a jujube-shaped cherry tomato variety. Conveyor transport speeds were set at 210, 280, and 350 mm/s; brush lengths at 70, 80, and 90 mm; brush clearances at 20, 22, and 24 mm; and brush diameters at 0.8, 1.0, and 1.2 mm. The two varieties showed a similar damage rate during calyx removal. However, Minimaru showed a higher calyx removal rate than Icon 513, indicating that it is most suitable for the calyx removal mechanization process.

Effects of Reheating Procedure and Oven Type on Performance Testing Results of Asphalt Mixtures

2018 ◽  
Vol 2672 (26) ◽  
pp. 124-133 ◽  
Author(s):  
Zachary Lemke ◽  
Husam Sadek ◽  
Daniel Swiertz ◽  
Signe Reichelt ◽  
Hussain U. Bahia
Keyword(s):  
Performance Testing ◽  
Substantial Effect ◽  
Asphalt Mixtures ◽  
Volumetric Properties ◽  
Performance Tests ◽  
Laboratory Equipment ◽  
Standard Procedures ◽  
And Performance ◽  
Time Required ◽  
Wheel Tracking

Reheating and oven-aging procedures of plant-produced asphalt mixtures in laboratories are important topics to consider as performance testing of mixtures becomes more popular among agencies. Differences between laboratory equipment and procedure could significantly affect performance properties. The objective of this study is to investigate the influence of sample size, oven type, and variation in reheating/aging temperatures on the results of two performance tests on plant-produced mixtures. A selected mixture was tested for volumetric properties and performance using Hamburg wheel-tracking (HWT) and semi-circular bending (SCB-IFIT) tests. Results show that reheating mixtures uncovered and in smaller containers could significantly reduce the time to achieve aging temperature, and could make the process more efficient and consistent. In addition, aging using three different oven types showed that temperature within ovens can vary significantly depending on the location of the sample inside the oven, which affects the time required to reach the target temperature, and thus may also influence the aging of the sample. The mixture volumetric properties show that the effect of various heating conditions is marginal. Using the developed reheating/aging procedure of this study, the results of the HWT and SCB-IFIT tests showed no substantial effect of oven type on rutting and cracking resistance. The overall results indicate that there is a need to standardize the conditions of reheating, sample geometry, and to verify uniformity of temperature in ovens. Such standardization can further reduce variability and thus should be part of the AASHTO/ASTM standard procedures for quality control, or of laboratory equipment calibration procedures.

Design of Integrative Testing System for Enclosures in Fuel System of Airplanes

2015 ◽  
Vol 719-720 ◽  
pp. 258-261
Author(s):  
Xiao Gang Li ◽  
Zhou Zhou ◽  
Ke Qiang Cao ◽  
Chao Xia ◽  
Na Li
Keyword(s):  
Experimental Research ◽  
Performance Testing ◽  
Testing System ◽  
Performance Tests ◽  
Fuel System ◽  
And Performance

In order to start performance testing and experimental research for enclosure of airplanes’ fuel systems, a type of integrative testing system is designed in this paper. This system can accomplish function and performance tests for enclosures in airplanes’ fuel system, and also can execute troubleshooting experiments.

scholarly journals Design and performance testing of areca nut thresher machine using solid triangle spike tooth type

2021 ◽  
Vol 922 (1) ◽  
pp. 012048
Author(s):  
R Bulan ◽  
Mustaqimah ◽  
K Siregar ◽  
S R Lesdiana ◽  
K Anwar ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Rotational Speed ◽  
Performance Testing ◽  
Areca Nut ◽  
Manufacturing Method ◽  
Palm Trees ◽  
Tooth Type ◽  
And Performance ◽  
Driving Source ◽  
Engine Capacity

Abstract Technology for handling agricultural products from areca nut has received less attention. However, the economic potential of the areca nut is comparable to that of other palm trees. Threshing areca nut from the bunch is one of the procedures that must be completed to obtain high-quality betel nut. Therefore, this research aims to design and test an areca nut threshing machine that uses a solid triangle spike-type threshing tooth. This study uses an experimental manufacturing method in the workshop and laboratory testing. A detailed engineering drawing of areca nut thresher machine is a guide in carrying out the manufacturer. The influence of rotational speed on the threshing shaft (34 rpm, 42 rpm, and 50 rpm) was investigated to determine the machinery’s performance (percentage of threshing results, engine capacity, and fuel consumption). This study indicates that the areca thresher machine has been successfully designed with a diesel motor driving source of 6.5 hp, 2200 rpm. Applied a rotational speed of 50 rpm will give the best percentage of threshing products. The increase in rotational speed applied to the threshing machine will be in line with the rise in the engine capacity. In addition, the fuel consumption of a diesel engine from this thresher machine is 0.039 l/hr.

Digitalization system of ancient architecture decoration art based on neural network and image features

2020 ◽  
pp. 1-12
Author(s):  
Wu Xin ◽  
Qiu Daping
Keyword(s):  
Neural Network ◽  
Construction Industry ◽  
Three Dimensional ◽  
Performance Testing ◽  
Image Features ◽  
Three Dimensional Model ◽  
Performance Effect ◽  
Data Process ◽  
And Performance ◽  
Construction Mode

The inheritance and innovation of ancient architecture decoration art is an important way for the development of the construction industry. The data process of traditional ancient architecture decoration art is relatively backward, which leads to the obvious distortion of the digitalization of ancient architecture decoration art. In order to improve the digital effect of ancient architecture decoration art, based on neural network, this paper combines the image features to construct a neural network-based ancient architecture decoration art data system model, and graphically expresses the static construction mode and dynamic construction process of the architecture group. Based on this, three-dimensional model reconstruction and scene simulation experiments of architecture groups are realized. In order to verify the performance effect of the system proposed in this paper, it is verified through simulation and performance testing, and data visualization is performed through statistical methods. The result of the study shows that the digitalization effect of the ancient architecture decoration art proposed in this paper is good.

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