STUDY ON FILLING PERFORMANCE OF HOLE FERTILIZATION DEVICE AND OPTIMIZATION OF CAVITY

Hole fertilization is an effective method to improve the utilization rate of chemical fertilizer. In order to improve the accuracy and stability of the amount of fertilizer discharging for the hole fertilization device, this paper proposed the method of rotary filling by notched disk, designed a hole fertilization device with notched disk, and completed the structure design of the device and cavity. Through the dynamic analysis of fertilizer particles in the process of fertilizer filling, this study found that the interface span of fertilizer cavity, the rotational speed of fertilizer disk, and the amount of fertilizer applied in each hole are the main factors affecting the performance of filling. Then, this study carried out the three-factor quadratic orthogonal rotation combination simulation test to optimize the structure of the cavity. The test used the discrete element method with interface span of fertilizer cavity, the rotational speed of fertilizer disk, and the amount of fertilizer applied in each hole as test factors and the accuracy and variation coefficient of filling amount as evaluation indexes. Results showed that the optimal performance was obtained when the cross section span of the cavity was 13.58°, the opening width was 29.56 mm, and the depth was 22.08 mm. The field validation showed that the average accuracy of filling amount per hole was 97.67%, and the average variation coefficient was 1.90%. The performance of fertilizer discharge satisfied the design requirements, and agreed with the law of the simulation results. The research results could provide a theoretical basis for the design of hole fertilization device and the improvement of filling performance.

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PARAMETER OPTIMIZATION AND EXPERIMENTAL RESEARCH ON THE HAMMER MILL 锤片式粉碎机参数优化与试验研究

INMATEH Agricultural Engineering ◽

10.35633/inmateh-62-36 ◽

2020 ◽

pp. 341-350

Author(s):

Di Wang ◽

Changbin He ◽

Haiqing Tian ◽

Liu Fei ◽

Zhang Tao ◽

...

Keyword(s):

Moisture Content ◽

Orthogonal Experiment ◽

Electricity Consumption ◽

Spindle Speed ◽

Hammer Mill ◽

Factors Affecting ◽

Evaluation Indexes ◽

Grain Moisture ◽

Validation Experiment ◽

Corn Grain

Low productivity and high electricity consumption are considered problems of the hammer mill, which is widely used in current feed production. In this paper, the mechanical properties of corn grain ground by a hammer mill were analysed, and the key factors affecting the performance of the hammer mill were determined. The single-factor experiment and three-factor, three-level quadratic regression orthogonal experiment were carried out with the spindle speed, corn grain moisture content and number of hammers as experimental factors and the productivity and electricity consumption per ton as evaluation indexes. The results showed that the order of influence on the productivity was spindle speed > corn grain moisture content > number of hammers and that the order of influence on the electricity consumption per ton was corn grain moisture content > spindle speed > number of hammers. The parameters were optimized based on the response surface method with the following results: the spindle speed was 4306 r/min, the corn grain moisture content was 10%, and the number of hammers was 24. The validation experiment was carried out with the optimal parameters’ combination. The productivity and electricity consumption per ton were 988.12 kg/h and 5.37 kW·h/t, respectively, which were consistent with the predicted results of the model.

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Loading Performance of a Novel Shearer Drum Applied to Thin Coal Seams

Energies ◽

10.3390/en14020358 ◽

2021 ◽

Vol 14 (2) ◽

pp. 358

Author(s):

Kuidong Gao ◽

Xiaodi Zhang ◽

Liqing Sun ◽

Qingliang Zeng ◽

Zhihai Liu

Keyword(s):

Rotational Speed ◽

Production Efficiency ◽

Loading Rate ◽

Positive Impact ◽

Structural Parameters ◽

Helix Angle ◽

Structure Design ◽

Coal Seams ◽

Coal Particles ◽

Relationship Of

The poor loading performance of shearer drums restricts the development and production efficiency of coal in thin coal seams. Changing operation and structural parameters can improve the drum’s loading performance to some extent, but the effect is not obvious. A two-segment differential rotational speed drum (TDRSD) was proposed after analyzing the drum’s influence mechanism on coal particles. To further reveal the drum’s coal loading principle, the velocity, particles distribution, and loading rate were analyzed. The effect of the matching relationship of the rotational speed and helix angle between the front and rear drum are also discussed. The results show that a lower front drum rotational speed had a positive impact on improving the loading performance, and the loading rate first increases and then decreases with the increase in rear drum rotational speed. The optimal loading performance was obtained in the range 60–67.5 rpm. The front drum’s helix angle had no evident effect on loading performance, and the loading rate increase with the increase in the rear drum’s helix angle. The results provide a reference and guidance for operation parameters selection, structure design, and drum optimization.

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A New System to Evaluate Comprehensive Performance of Hard-Rock Tunnel Boring Machine Cutterheads

Chinese Journal of Mechanical Engineering ◽

10.1186/s10033-019-0410-2 ◽

2019 ◽

Vol 32 (1) ◽

Author(s):

Ye Zhu ◽

Wei Sun ◽

Junzhou Huo ◽

Zhichao Meng

Keyword(s):

Stability Index ◽

Tunnel Boring Machine ◽

Efficiency Index ◽

Structure Design ◽

Cutting Efficiency ◽

Evaluation Indexes ◽

Average Value ◽

Tunnel Boring ◽

Rock Tunnel ◽

Thrust And Torque

AbstractThe accurate performance evaluation of a cutterhead is essential to improving cutterhead structure design and predicting project cost. Through extensive research, this paper evaluates the performance of a tunnel boring machine (TBM) cutterhead for cutting ability and slagging ability. This paper propose cutting efficiency, stability, and continuity of slagging as the evaluation indexes of comprehensive cutterhead performance. On the basis of research of true TBM engineering applications, this paper proposes a calculation method for each index. A slagging efficiency index with a ratio of the maximum difference between the slagging amount and average slagging is established. And a slagging stability index with a ratio of the maximum slagging fluctuation and average slagging is presented. Meanwhile, a cutting efficiency index by the weighed average value of multistage rock fragmentation of a cutter’s specific energy is established. The Robbins and China Railway Construction Corporation (CRCC) cutterheads are evaluated. The results show that under the same thrust and torque, the slagging stability of the CRCC scheme is worse, but the slagging continuity of the CRCC scheme is better. The cutting ability index shows that the CRCC cutterhead is more efficient.

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How Blue Carbon Ecosystems Are Perceived by Local Communities in the Coral Triangle: Comparative and Empirical Examinations in the Philippines and Indonesia

Sustainability ◽

10.3390/su13010127 ◽

2020 ◽

Vol 13 (1) ◽

pp. 127

Author(s):

Jay Mar D. Quevedo ◽

Yuta Uchiyama ◽

Kevin Muhamad Lukman ◽

Ryo Kohsaka

Keyword(s):

Global Climate ◽

Anthropogenic Activities ◽

Local Level ◽

Management Strategies ◽

The Philippines ◽

Local Communities ◽

Blue Carbon ◽

Utilization Rate ◽

Coral Triangle ◽

Factors Affecting

Blue carbon ecosystem (BCE) initiatives in the Coral Triangle Region (CTR) are increasing due to their amplified recognition in mitigating global climate change. Although transdisciplinary approaches in the “blue carbon” discourse and collaborative actions are gaining momentum in the international and national arenas, more work is still needed at the local level. The study pursues how BCE initiatives permeate through the local communities in the Philippines and Indonesia, as part of CTR. Using perception surveys, the coastal residents from Busuanga, Philippines, and Karimunjawa, Indonesia were interviewed on their awareness, utilization, perceived threats, and management strategies for BCEs. Potential factors affecting residents’ perceptions were explored using multivariate regression and correlation analyses. Also, a comparative analysis was done to determine distinctions and commonalities in perceptions as influenced by site-specific scenarios. Results show that, despite respondents presenting relatively high awareness of BCE services, levels of utilization are low with 42.9–92.9% and 23.4–85.1% respondents in Busuanga and Karimunjawa, respectively, not directly utilizing BCE resources. Regression analysis showed that respondents’ occupation significantly influenced their utilization rate and observed opposite correlations in Busuanga (positive) and Karimunjawa (negative). Perceived threats are found to be driven by personal experiences—occurrence of natural disasters in Busuanga whereas discerned anthropogenic activities (i.e., land-use conversion) in Karimunjawa. Meanwhile, recognized management strategies are influenced by the strong presence of relevant agencies like non-government and people’s organizations in Busuanga and the local government in Karimunjawa. These results can be translated as useful metrics in contextualizing and/or enhancing BCE management plans specifically in strategizing advocacy campaigns and engagement of local stakeholders across the CTR.

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Lab Testing and Finite Element Method Simulation of Hole Deflector Performance for Radial Jet Drilling

Journal of Energy Resources Technology ◽

10.1115/1.4035552 ◽

2017 ◽

Vol 139 (3) ◽

Cited By ~ 9

Author(s):

Bin Wang ◽

Gensheng Li ◽

Zhongwei Huang ◽

Tianqi Ma ◽

Dongbo Zheng ◽

...

Keyword(s):

Numerical Simulation ◽

Low Cost ◽

Geometric Model ◽

Frictional Resistance ◽

Finite Element Method Simulation ◽

Optimization Method ◽

Structure Design ◽

Coal Bed ◽

Factors Affecting ◽

High Pressure Water Jet

Radial jet drilling (RJD) is an efficient approach for improving the productivity of wells in low permeability, marginal and coal-bed methane (CBM) reservoirs at a very low cost. It uses high-pressure water jet to drill lateral holes from a vertical wellbore. The length of the lateral holes is greatly influenced by the frictional resistance in the hole deflector. However, the hole deflector frictional resistance and structure design have not been well studied. This work fills that gap. Frictional resistances were measured in a full-scale experiment and calculated by numerical simulation. The structure of the hole deflector was parameterized and a geometric model was developed to design the hole deflector track. An empirical model was then established to predict the frictional resistance as a function of the hole deflector structure parameters and an optimization method for designing the hole deflector was proposed. Finally, four types of hole deflectors were optimized using this method. The results show good agreement between the numerical simulation and the experimental data. The model error is within 11.6%. The bend radius R and exit angle β are the key factors affecting the performance of the hole deflector. The validation test was conducted for a case hole deflector (5½ in. casing). The measured frictional resistance was decreased from 31.44 N to 23.16 N by 26.34%. The results from this research could serve as a reference for the design of hole deflectors for radial jet drilling.

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Structure Design of the Single-Axis Piezoelectric Actuated Stage Using a 4-9-9-14 Piezoelectric Actuator

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.303-306.1661 ◽

2013 ◽

Vol 303-306 ◽

pp. 1661-1665 ◽

Cited By ~ 5

Author(s):

Shann Chyi Mou

Keyword(s):

Piezoelectric Actuator ◽

Natural Environment ◽

Rotational Speed ◽

Structure Design ◽

Correct Position ◽

Labview Software ◽

Position Signal ◽

Data Acquisition Card ◽

Linear Encoder ◽

Labview Program

In this paper, a novel piezoelectric actuator structure - 4-9-9-14 piezoelectric actuator is constructed, and it is made of piezoelectric buzzer to drive a piezoelectric actuated stage. The 4-9-9-14 piezoelectric actuator offers a better balanced capability of forward rotation and reverse rotation than the conventional edge-driving piezoelectric actuator. According to the rotational speed experiment, the CW/CCW ratio of the 4-9-9-14 piezoelectric actuator is probably 1:0.8. The movement of the pie-zoelectric actuated stage is read and analyzed by means of data acquisition card and LabVIEW software operating in conjunction with a linear encoder. In a natural environment, plenty of noise interferes with linear encoder signals and results in erroneous addition performed by a counter. Therefore, the LabVIEW program set forth the means of filtering and the method for retrieving a correct position signal.

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Sand Removal Mechanism of a High-Speed Roller Bit with Helical Sealing

Applied Sciences ◽

10.3390/app9183830 ◽

2019 ◽

Vol 9 (18) ◽

pp. 3830

Author(s):

Yi Zhou ◽

Bin Tan ◽

Yuxing Huang

Keyword(s):

Rotational Speed ◽

High Speed ◽

Oil And Gas ◽

Structural Parameters ◽

Working Life ◽

Removal Mechanism ◽

Drilling Tool ◽

Rock Stratum ◽

Factors Affecting ◽

Simulation And Experiment

A roller bit is a drilling tool widely used in oil and gas exploitation. The roller bit is applied to cutting the rock stratum, and its working life and rotational speed are important factors affecting the drilling efficiency. Moreover, a bearing sealing affects the working life and rotational speed of a bit. This paper proposes a helical sealing structure that addresses the problems of severe sealing wear and a short working life. This structure has been used in many engineering fields but was first applied to the roller bit. This paper investigates the sand removal mechanism of helical sealing through simulation and experiment. Additionally, helical sealing parameters were optimized. The optimum structural parameters of helical sealing in a high-speed roller bit were obtained. It was shown that the helical sealing structure can be applied to a roller bit with good effects of sealing and sand removal.

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Analysis of the Main Factors Affecting the Surface Morphology of FSJ Joint

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1027.183 ◽

2014 ◽

Vol 1027 ◽

pp. 183-186 ◽

Cited By ~ 1

Author(s):

Yong Fang Deng ◽

Dun Wen Zuo ◽

Bo Song

Keyword(s):

Surface Morphology ◽

Linear Relationship ◽

Rotational Speed ◽

Rotation Speed ◽

Feed Speed ◽

Factors Affecting ◽

Friction Stir ◽

Joint Surfaces ◽

Line Spacing ◽

Main Factors

An attempt is made here to analyze the effect of the process parameter and shoulder of tool on the surface topography of FSJ (friction stir joining) joint. It is found that, it is a linear relationship between the feed speed and arc lines spacing, and the slope decreases as feed speed increasing. As the rotational speed increasing, the arc line spacing reduces. While FSJ processes completed at different parameters contain the same ratio between the feed speed and the rotation speed, the arc line spacing of the joint surfaces is the same. The shoulder of tool can increase the width of joint lines, refine arc lines structure, reduce the flash in the retreating side, but increase the flash in the advancing side.

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ANALYSIS AND CALIBRATION OF PARAMETERS OF BUCKWHEAT GRAIN BASED ON THE STACKING EXPERIMENT

INMATEH Agricultural Engineering ◽

10.35633/inmateh-64-46 ◽

2021 ◽

pp. 467-476

Author(s):

Rong Fan ◽

Qingliang Cui ◽

Yanqing Zhang ◽

Qi Lu

Keyword(s):

Friction Coefficient ◽

Static Friction ◽

Calibration Method ◽

Simulation Test ◽

Physical Test ◽

Factors Affecting ◽

Static Friction Coefficient ◽

Significant Difference ◽

Simulation Parameters ◽

Significant Factors

The stacking test based on response surface method (RSM) was carried out to calibrate the simulation parameters of buckwheat grain by discrete element method (DEM). The static friction coefficient of buckwheat-buckwheat and that of buckwheat-steel are significant factors affecting the repose angle. A quadratic polynomial model for the repose angle and the 2 significant parameters was established and optimized. The optimal combination was obtained: buckwheat-buckwheat static friction coefficient of 0.482, buckwheat-steel static friction coefficient of 0.446. It was found that there was no significant difference between the results of the simulation test and physical test (P>0.05), indicating that the parameter calibration method based on RSM is feasible. The calibrated parameters can provide reference to the simulation of buckwheat production process and machineries design.

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The Effect of Health Insurance on the Utilization of Health Services: A Systematic Review and Meta-Analysis

10.31661/gmj.v8i0.1411 ◽

2019 ◽

Vol 8 ◽

pp. 1411

Author(s):

Elham Shami ◽

Jafar Sadegh Tabrizi ◽

Shirin Nosratnejad

Keyword(s):

Systematic Review ◽

Health Insurance ◽

Health Services ◽

Health Care Services ◽

Meta Analysis ◽

Utilization Rate ◽

Outpatient Services ◽

Factors Affecting ◽

Utilization Of Health Services ◽

Care Services

Insurance organizations are among the most influential organizations in the health system, which can lead to healthcare efficiency and patient satisfaction in case they are increasingly accessed. The main purpose of the present systematic review was to examine the effect of health insurance on the utilization of health services and also to examine the factors affecting it. The present study was a systematic review that aimed to examine the effect of health insurance on the utilization of health care services. The study was conducted in 2016 using Scopus, PubMed, Web of Science, Science Direct, and ProQuest databases. We examined the utilization rate of health insurance in insured people. The inclusion and exclusion criteria were included based on review and meta-analysis purposes. The utilization of health services increased for inpatient and outpatient services. The utilization rate of inpatient services increased by 0.51% whereas the utilization rate of outpatient services increased by 1.26%. We classified the variables affecting the utilization rate of insurance into three main categories and sub-categories: demographic variables of the household, socioeconomic status, and health status. Our study showed that insured people increased the utilization rate of health services, depending on the type of health services. Thus, health policymakers should consider the community’s health insurance as a priority for health programs. For now, implementing universal health insurance is a good solution. [GMJ.2019;8:e1411]

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