Automatic Position Control of a 300,000-Ton Ship Ocean Mining Systems

1982 ◽  
Vol 104 (4) ◽  
pp. 285-293 ◽  
Author(s):  
A. W. Brink ◽  
J. S. Chung
Keyword(s):  
Position Control ◽  
Mining Operations ◽  
Mining System ◽  
Design Data ◽  
Power Estimate ◽  
Positioning Control ◽  
Pipe System ◽  
The Pacific ◽  
And Performance ◽  
Ocean Mining

Extensive computer simulation and performance analysis and assessment have been carried out for the dynamic positioning control of a large, commercial ocean mining ship / pipe system, and selective results are presented. It is tentatively concluded that automatic position control, with a manual override option, of a 300,000-ton ship with 18 thrusters of 4500 hp and an 18,000 ft long lift pipe system would be feasible for commercial operations of a preliminary mining system in the Pacific Ocean. The preliminary system employs a self-propelled miner. For the feasibility study, we have performed the following: the thruster power estimate, a subsequent selection of an azimuthing ship thruster system configuration, steady-state and dynamic motion of the ship-pipe system, track-keeping, turning and station-keeping control, design of an automatic control system, and nonlinear control simulation during mining operations and selective contingency situations. For the development of commercial systems, the small-size, test-mining system does not provide all the design data. It is much larger, and subsequently, requires development of more sophisticated technology and engineering capabilities. The present method of analysis and simulation can be applied to many other mining system analyses, and to the position keeping control of deepsea drilling systems, and deepsea piplaying.

Heave Induced Internal Flow Fluctuations in Vertical Transport Systems for Deep Ocean Mining

2014 ◽  
Author(s):  
Stephan D. A. Hannot ◽  
Jort M. van Wijk
Keyword(s):  
Transport System ◽  
Internal Flow ◽  
Deep Ocean ◽  
Vertical Transport ◽  
Transport Systems ◽  
Ship Motions ◽  
Centrifugal Pumps ◽  
Mining System ◽  
Pump System ◽  
Ocean Mining

Deep ocean mining systems will have to operate often in harsh weather conditions with heavy sea states. A typical mining system consists of a Mining Support Vessel (MSV) with a Vertical Transport System (VTS) attached to it. The transport system is a pump pipeline system using centrifugal pumps. The heave motions of the ship are transferred to the pump system due to the riser-ship coupling. Ship motions thus will have a significant influence on the internal flow in the VTS. In this paper, the influence of heave motions on the internal flow in the VTS for a typical mining system for Seafloor Massive Sulfide (SMS) deposits in Papua New Guinea is analyzed. Data on the wave climate in the PNG region is used to compute the ship motions of a coupled MSV-VTS. The ship motions then are translated into forces acting on the internal flow in order to compute fluctuations in the internal flow. In this way, the workability of the mining system with respect to the system’s production can be assessed. Based on a detailed analysis of the internal flow in relation to ship motions, the relevance of a coupled analysis for the design of VTS is made clear. This paper provides a method for performing such analyses.

TRANSFORMATIONAL LEADERSHIP IN IMPROVING LECTURER PERFORMANCE AT MUHAMMADIYAH HIGHER

2021 ◽  
Vol 1 (3) ◽  
pp. 171-178
Author(s):  
Saipul Wakit ◽  
Indah Yuliana ◽  
Indah Yuliana
Keyword(s):  
Transformational Leadership ◽  
Leadership Style ◽  
Transformative Leadership ◽  
Intellectual Stimulation ◽  
Design Data ◽  
Technical Ability ◽  
Individual Consideration ◽  
And Performance ◽  
Transformational Leadership Style

The transformational leadership style in higher education has four indicators carried out by the rector. These indicators include exemplary attitudes, inspiring motivation, intellectual stimulation and the rector's consideration for lecturers. Practically, the purpose of this article is to find out how the rector provides examples, inspires motivation and individual considerations in improving the performance of lecturers at Muhammadiyah universities. The operational research method uses a qualitative approach with a phenomenological case study design. Data collection activities were carried out by means of observation, interviews with informants, and extracting information from documents. To ensure the validity of the research data, several methods are used, namely credibility, transferability, dependability and confirmability. The results of the study explain that transformative leadership in Muhammadiyah universities objectively has provided an example with several things that are applied in attitudes, ideas, behavior and performance. While motivation is carried out by the Chancellor of the lecturers in several ways, namely through behavior, technical ability, supervision and policy. In stimulating the intellectuals of lecturers in several ways, namely to think modern and relevant, think forward and continue to make changes as well as productive, innovative, creative in carrying out tasks and performance. In individual consideration, the Chancellor is more humane towards lecturers, both in the work environment and in the community.

Anxiety and the Ironman: Investigating the Antecedents and Consequences of Endurance Athletes’ State Anxiety

1995 ◽  
Vol 9 (1) ◽  
pp. 29-40 ◽  
Author(s):  
Jon Hammermeister ◽  
Damon Burton
Keyword(s):  
Pacific Northwest ◽  
State Anxiety ◽  
Significant Negative Correlation ◽  
Endurance Athletes ◽  
The Pacific ◽  
Negative Thoughts ◽  
Sport Type ◽  
Antecedents And Consequences ◽  
And Performance ◽  
Measure Of Performance

This investigation had three primary purposes: (a) investigating whether anxiety has a major debilitating effect on the performance of endurance athletes, (b) assessing whether age or sport-type differences were evident in the precompetitive state anxiety patterns of triathletes and two of their singlesport counterparts, and (c) testing the anxiety–performance hypothesis for endurance athletes using an intraindividual measure of performance. Subjects were 293 endurance athletes recruited from races in the Pacific Northwest. Results revealed that precompetitive anxiety did not impair the performance of endurance athletes. Triathletes were significantly more cognitively and somatically anxious than either runners or cyclists, and older endurance athletes were found to experience significantly less cognitive anxiety than did their younger counterparts. Results did not support the anxiety–performance hypothesis, although a significant negative correlation was found between negative thoughts during the race and performance.

scholarly journals Analysis of Employee Satisfaction and Performance Based on the Characteristics of Compensation Systems and Organizational Culture in Hospital dr. Soepraoen Malang

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Untung Slamet Suhariyono
Keyword(s):  
Organizational Culture ◽  
Significant Influence ◽  
Employee Satisfaction ◽  
Quantitative Research ◽  
Employee Performance ◽  
Compensation System ◽  
Design Data ◽  
Compensation Systems ◽  
And Performance ◽  
Performance Satisfaction

This study aims to determine the effect of Employee Satisfaction and Performance based on the Characteristics of Compensation Systems and Organizational Culture in the Hospital of Dr. Soepraoen Malang. This study uses a quantitative research method research design. Data collected using a questionnaire on 100 permanent employee respondents at Soepraoen Hospital Malang.Independent variables of this study are Job Satisfaction and Employee Performance. The dependent variable of this study is the Compensation System and Organizational Culture. The results of the study show (1) Employee satisfaction has a significant influence on the compensation system; (2) Organizational culture has a significant influence on employee satisfaction; (3) Compensation has a significant influence on employee performance;(4) Organizational culture has a significant influence on employee performance; (5) Compensation has a significant effect on employee performance through employee performance satisfaction at the Hospital. II dr. Soepraoen; (6) Organizational culture has a significant influence on employee performance through employee performance satisfaction at the Tk Hospital. II dr. Soepraoen.

scholarly journals MODERNIZATION OF THE MINING SYSTEM OF SMALL DEPOSITS OF RICH COPPER PYRITE ORES

2020 ◽  
Vol 12 (3) ◽  
pp. 444-453
Author(s):  
Igor SOKOLOV ◽  
◽  
Yury ANTIPIN ◽  
Artem ROZHKOV ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Average Length ◽  
Thickness Variation ◽  
Chamber System ◽  
Mining Operations ◽  
Mining System ◽  
Ore Body ◽  
Experimental Block ◽  
Sublevel Caving

The purpose work. Substantiation and selection of a safe and effective option of mining technology of the experimental block in the pilot industrial mining of the Skalistoe deposit. Method of research. Analysis and synthesis of project solutions, experience in mining inclined low-thickness ore bodies, economic and mathematical modeling and optimization of the parameters of options mining systems in the conditions of the experimental block. Results of research. As a result of research it was established: - the sublevel caving mining system with the parameters adopted in the project does not guarantee the completeness of the extraction of reserves and the effectiveness of mining operations. Project indicators of extraction by sublevel caving technology with frontal ore drawing are overestimated and difficult to achieve in these geological and technical conditions (combination of low thickness and angle of ore body); project scheme for the delivery and transportation of rock mass seems impractical due to the significant volume of heading workings and increased transportation costs; - eight technically rational options of various mining systems were constructed, most relevant to the geological and technical conditions of the deposit. Five variants of the sublevel chamber system and pillar caving, a project variant of sublevel caving technology with frontal ore drawing and two options flat-back cut-and-fill system were considered; - for mining the Skalistoe deposit, according to the results of economic and mathematical modeling, optimal by the criterion of profit per 1 ton of balance reserves of ore is a option of the technology of chamber extraction with dual chambers, frontal drawing of ore by remote-controlled load-haul-dump machine and subsequent pillars caving, as having the greatest profit; - the calculations justified stable spans of dual chambers (25.3 m) and the width of panel pillars (3 m). With an allowable span of 25.3 m, the roof of the dual chambers will be stable with a safety factor of 1.41, and a panel pillar with a width of 3 m has a sufficient margin of safety (more than 1.6) in the whole range of ore body thickness variation; - the proposed scheme of delivery and transportation of rock mass, which allows to reduce the volume of tunnel works by 26% and the average length of transportation by 10-15% compared with the project. Findings. Developed in the process of modernization the technology sublevel chamber system with double-chamber, compared with the project technology, it is possible to significantly increase the efficiency of mining of the low thickness deposit of rich ores Skalistoe by reducing the specific volume of preparatory-rifled work by 34%, the cost of mined ore by 12%, losses and ore dilution – by 2 and 2.9 times, respectively.

scholarly journals Stakeholder Engagement in Monitoring and Evaluation and Performance of Literacy and Numeracy Educational Programme in Public Primary Schools in Nairobi County, Kenya

2020 ◽  
Vol 10 (2) ◽  
pp. 10
Author(s):  
Stela Silas Karimi ◽  
Angeline Sabina Mulwa ◽  
Dorothy Ndunge Kyalo
Keyword(s):  
Correlation Coefficient ◽  
Stakeholder Engagement ◽  
Primary Schools ◽  
Monitoring And Evaluation ◽  
Educational Programme ◽  
Coefficient Of Determination ◽  
Intervention Programme ◽  
Design Data ◽  
Numeracy Skills ◽  
And Performance

Kenya’s education has faced by many challenges especially in literacy and numeracy skills since the introduction of free primary education. This was contributed by swelling of enrollment in classrooms hence low performance of literacy and numeracy skills. The purpose of this article is to establish the extent to which stakeholder engagement influence performance of literacy and numeracy educational programme in public primary schools in Nairobi County, Kenya. Despite various efforts by key educational stakeholders to improve learner’s performance, minimal achievement have been experienced on learner’s skills. This study adapted descriptive research survey design and correlational research design. Data collected from the respondents by use of questionnaires and interview schedules from a target population of 2053 and a sample size of 335. Data was analyzed using SPSS version 25 and results presented in tables and figures. Arithmetic mean and standard deviation generated from the descriptive data and Pearson moment correlation coefficient (r) were computed. The coefficient of determination R2 is 0.480 this is an indicator that R2 was the coefficient of determination of this model and it depicted that stakeholder engagement explained 48%. The remaining 52% was explained by other factors. The overall F statistics 257.949 with p- 0.000b<0.05 implying a statistical significant relationship between stakeholder engagement and performance of literacy and numeracy educational programme. Interpretations were done and recommendations were policy makers should embrace the methodology of engaging all the stakeholders in programme. This was an indication of strong positive relationship between Stakeholder engagement and performance of literacy and numeracy educational programme. The results showed that stakeholder engagement for monitoring and evaluation strongly influenced the performance of literacy and numeracy educational programme as shown by a correlation coefficient, which was statically significant. Learners should explore more things on their own in order to make predictive answers. Recommendations for further research on participatory monitoring and evaluation practices, which was lacking and specifically involvement of all the stakeholders in the intervention programme in basic education.

Improving Safety when Extracting Water-soluble Ores by Optimizing the Parameters of the Backfill Mass

2021 ◽  
pp. 53-59
Author(s):  
M.M. Khayrutdinov ◽  
◽  
Ch.B. Kongar-Syuryun ◽  
A.M. Khayrutdinov ◽  
Yu.S. Tyulyaeva ◽  
...  
Keyword(s):  
Strain State ◽  
Raw Materials ◽  
Research Work ◽  
Integrated Approach ◽  
Water Soluble ◽  
Mining Operations ◽  
Stress Strain ◽  
Mining System ◽  
Stress Strain State ◽  
Geological Conditions

The results of the scientific and research work devoted to modeling the stress-strain state of the mining system of an underground mine using the finite element method in the FLAC3D software are presented in the article. The possibility of using room-and-pillar mining with backfill with the abandonment of chain pillars is justified. The results are presented concerning the research results of the quantitative assessment of the mass using the von Mises equation and Norton' power law of creep to estimate the contour stress. It becomes possible to determine the sequence of mining of the deposit area and the stage-by-stage filling of the stopes at the stage of mining design due to the high accuracy of modeling the stress-strain state of the mass near mining operations using FLAC3D software. The proposed approach is possible when evaluating the geotechnical state of the rock mass when using the mining systems with various methods of support of the mined-out area: natural; artificial; with the collapse of ores and enclosing rocks, as well as when calculating the combined method of deposit development. A differentiated approach to assessing the state of the mass is possible considering difficult mining and geological conditions, conditions of increased rock pressure, abundant water influx, increased fracturing of rocks by introducing additional conditions into the model depending on its geotechnical state. Variant of the comprehensive exploitation of mineral resources was proposed considering the total value of natural and man-made geo-resources of the area being mined. The possibility of rational use of the mined-out space with the use of various positive qualities of geo-resources at their manmade transformation is also considered. An assessment of the mineral and raw materials potential of the mined area is given with a proposal for the prospects of increasing the integrated approach of excavation, increasing the life of the mining enterprise and the complexity of developing this area.

Dynamic Model Development and Simulation Analysis of China’s Total Integrated Deep Ocean Mining Pilot System

2010 ◽  
Author(s):  
Yu Dai ◽  
Shaojun Liu ◽  
Li Li ◽  
Yan Li ◽  
Gang Wang ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Deep Ocean ◽  
Pipeline System ◽  
Mining System ◽  
Fem Model ◽  
Body Model ◽  
Single Body ◽  
Operation Process ◽  
Ocean Mining ◽  
Dem Model

A typical and may be the most prospective deep ocean mining system is an integration of a mining ship system, a hoist pipeline system and a self-propelled seafloor miner system. According to this representative system configuration, China has designed and developed a deep ocean mining pilot system. In order to evaluate and improve the design of the pilot system, and further to provide technical references for the practical system operation, dynamic simulation models of the subsystems and the total integrated system are developed. For the seafloor miner, a multi-body model with the scale of 1:1 to the actual size of the pilot miner is built, which can be used effectively to perform detailed design, analysis and optimization of the miner system. Meanwhile, to make the integration of the total mining system possible, a simplified 3D single-body model with 6 DOF of the miner is also developed, which is capable of real-time simulation and can be easily integrated with other subsystems. For the pipeline system including the rigid lifting pipe, submerged pump, buffer storage and flexible hose, finite element method (FEM) and discrete element method (DEM) are all proposed and developed. With the FEM model, the towing mining operation process, as well as the launching and retrieval process, can be analyzed. Whereas, the DEM model is preferred to perform the dynamic analysis of the total integrated mining system due to its relative high computation efficiency compared with that of the FEM model. To realize the dynamic analysis of the total integrated mining system with relative high efficiency and accuracy, the single body model of the miner and the DEM model of the pipeline are chosen to be integrated to form the total system and perform dynamic analysis, which in a way can provide specific guidance and suggestions for the practical deep ocean mining system analysis, operation and control. For further researches, more attention will be focused on the analysis of the launching and retrieval operation process of the total mining system, including the water entry of the miner, the launching process of the pipeline system and the final seafloor-touchdown of the miner.

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