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"Offshore equipment"
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Development of Offshore Engineering Equipment and High-end Shipbuilding Industry: A Case Study of Dinghai District, Zhoushan, Ningbo
Huang, C. and Zheng, W.X.J., 2020. Research on the development of offshore engineering equipment and high-end shipbuilding industry: A case study of Dinghai District, Zhoushan, Ningbo. In: Guido Aldana, P.A. and Kantamaneni, K. (eds.), Advances in Water Resources, Coastal Management, and Marine Science Technology. Journal of Coastal Research, Special Issue No. 104, pp. 700–704. Coconut Creek (Florida), ISSN 0749-0208. The 21st century is the century of the oceans, and speeding up the development and utilization of marine resources has become the strategic orientation of economic development of all countries in the world. Marine engineering equipment refers to the general term for various mechanical equipment needed in the course of a series of marine economic activities. And high-end ships, because of their complex design and manufacturing processes and powerful functions, occupy a very important position in the marine equipment industry chain, and have extremely high research and application value. The development of marine engineering equipment and high-end shipbuilding industry can realize the wider application and development of marine resources. Therefore, this article analyzes the development model of Korean marine engineering equipment and high-end ship manufacturing industry, and uses Ningbo Zhoushan Dinghai District as a focus area to conduct a matching analysis, in order to provide suggestions for the development of marine engineering equipment and high-end ship manufacturing industry.
Journal Article
Research on the measurement of an independent and controllable high-end equipment manufacturing industry
Against the present background of trade protectionism and anti-globalization, an independent and controllable high-end equipment manufacturing industry has become the focus of attention from all walks of life. Based on industrial safety and some related theories, this paper analyzes the connotation of an independent and controllable high-end equipment manufacturing industry, constructs a measurement index system of it with patent information, and designs a solution by a combination of “Entropy Method + TOPSIS”. At the end of the paper, by using the relevant data of global patent database, the offshore equipment manufacturing industry is taken as an example to measure its ability of independence and controllability. The results show that the measurement index data is consistent with the development status of China's offshore equipment manufacturing industry, which verifies the effectiveness of the index system and measurement method.
Journal Article
Bolting Reliability for Offshore Oil and Natural Gas Operations
The Planning Committee on Connector Reliability for Offshore Oil and Natural Gas Operations held the Workshop on Bolting Reliability for Offshore Oil and Natural Gas Operations in Washington, D.C., on April 10-11, 2017. The workshop was designed to advance and develop a comprehensive awareness of the outstanding issues associated with fastener material failures and equipment reliability issues. Speakers and participants were also encouraged to discuss possible paths for ameliorating risks associated with fasteners used for subsea critical equipment in oil and gas operations. This publication summarizes the presentations and discussions from the workshop.
eBook
Study on Logistics Cost Optimization of Offshore Oil Service Industry Based on Offshore Oil Service Cost Model
Wang, H. and Zhao, Z., 2019. Study on logistics cost optimization of offshore oil service industry based on offshore oil service cost model. In: Li, L.; Wan, X.; and Huang, X. (eds.), Recent Developments in Practices and Research on Coastal Regions: Transportation, Environment and Economy. Journal of Coastal Research, Special Issue No. 98, pp. 171–174. Coconut Creek (Florida), ISSN 0749-0208. The offshore oil service industry is an industry that provides professional services for offshore oil, including engineering services, facilities construction, and ship technical services. These services include exploration, development, and production of offshore oil and gas. Therefore, the offshore oil service industry occupies a large proportion of the logistics cost, which is mainly the monetary performance of various offshore operations and resources consumed in the space movement or time occupation of offshore engineering equipment. It is also the sum of manpower, material, and financial expenditure of marine engineering equipment in the process of physical movement, such as packaging, handling, handling, transportation, storage, circulation, and processing. According to the characteristics of the logistics system in the offshore oil service industry, this paper establishes an optimization model of logistics cost for the offshore oil service industry, which satisfies the requirements of order cycle regularity and logistics cost optimization. This paper calculates the solution of the model by case study. Through the optimization of logistics cost, this paper realizes the optimal allocation of resources and sustainable development.
Journal Article
Analysis and Research on Financial Competitiveness of Listed Companies in Offshore Engineering Manufacturing
Tang, J. and Fu, Y., 2020. Analysis and research on financial competitiveness of listed companies in offshore engineering manufacturing. In: Gong, D.; Zhang, M., and Liu, R. (eds.), Advances in Coastal Research: Engineering, Industry, Economy, and Sustainable Development. Journal of Coastal Research, Special Issue No. 106, pp. 45–48. Coconut Creek (Florida), ISSN 0749-0208. In recent years, with the implementation of the national ocean development strategy, China's offshore engineering equipment manufacturing enterprises have achieved rapid development, but compared with developed countries, China's listed enterprises in the offshore engineering equipment manufacturing industry still have many problems. This paper first introduces the theory of financial competitiveness, then discusses the definition and characteristics of the concept of the offshore engineering equipment manufacturing industry and constructs the financial risk evaluation model of listed enterprises of the offshore engineering equipment manufacturing industry. Finally, this paper proposes that listed enterprises of offshore engineering equipment manufacturing should broaden financing channels, enhance capital strength, increase cash flow, improve risk prevention, improve management level, and enhance development ability.
Journal Article
Research on the Constitutive Relationship of the Coarse-Grained Heat-Affected Zone in Ship Thick-Plate Welded Joints of Ship Structures
This study addresses the constitutive relationship of the welded coarse-grained heat-affected zone (CGHAZ) in 80-mm-thick DH36 marine steel plates. By integrating quasi-static tensile testing, digital image correlation (DIC) technology, and metallographic analysis, we systematically investigated the mechanical property differences and underlying mechanisms between the CGHAZ and base metal (BM). High-precision DIC technology enabled strain field characterization at the microscale in the CGHAZ, while the Ramberg-Osgood model was adopted to establish a dual-material constitutive equation. The results demonstrate that grain coarsening induced by welding thermal cycles significantly influenced the mechanical responses: the CGHAZ exhibited enhanced tensile strength but reduced plastic compatibility due to decreased grain boundary density. Notably, gradient differences in elastic modulus (CGHAZ: 184 GPa vs. BM: 213 GPa) and yield strength (CGHAZ: 363 MPa vs. BM: 373 MPa) between the BM and CGHAZ necessitate strict differentiation in engineering design. This work overcomes the limitations of oversimplified CGHAZ properties in conventional design approaches, providing a novel methodology for strength assessment and lightweight design of marine structures. The findings offer critical theoretical insights and practical guidelines for enhancing the reliability of offshore engineering equipment.
Journal Article
A Pipeline Hoop Stress Measurement Method Based on Propagation Path Correction of LCR Waves
Pipelines are extensively used in offshore equipment. Accurate and non-destructive measurement of hoop stress conditions within pipes is critical for ensuring the integrity of offshore structures. However, the existing technology to measure the hoop stress of the pipeline needs to planarize the surface of the pipeline, which greatly limits the detection efficiency. This study proposes a method for pipeline hoop stress measurement using a planar longitudinal critically refracted (LCR) probe, based on correcting LCR wave-propagation paths, which solves the problem of pipeline planarization in pipeline hoop stress measurement. First, a linear relationship between stress variations and ultrasonic time-of-flight changes in the material was established based on the acoustoelastic effect. Finite element analysis was then used to construct an acoustic simulation model for the hoop direction of the pipeline. Simulation results showed that LCR waves propagated within a wedge as quasi-plane waves and, upon oblique incidence into the pipeline, traveled along the chordal direction. Furthermore, using ray tracing methods, a mapping relationship between the pipeline geometry and the ultrasonic propagation path was established. Based on this, the LCR pipeline hoop stress measurement (LCR-HS) method was proposed. Finally, a C-shaped ring was employed to verify the measurement accuracy of the LCR-HS method. Experimental results indicated that the measurement error decreased with increasing pipe diameter and fell below 8% when the diameter exceeded 400 mm. This method enables precise measurement of hoop stress on curved surfaces by revealing the hoop propagation behavior of LCR waves in pipelines. The findings provide a technical reference for evaluating pipeline stress states, which is of significant importance for assessment of pipeline integrity.
Journal Article
Marine-Hydraulic-Oil-Particle Contaminant Identification Study Based on OpenCV
Particulate pollutants mixed in hydraulic oil will lead to the failure of the marine hydraulic system. Nowadays, the current identification methods of particulate pollutants in oil make it challenging to obtain the specific parameters of pollutants. For this reason, this paper proposes a recognition method of marine-hydraulic-oil-particle pollutants based on OpenCV. The image of particles in the marine hydraulic oil was preprocessed by OpenCV software and using the Canny operator edge detection algorithm to extract the contour of particle pollutants to obtain their area and perimeter. The recognition accuracy reached 95%. Using the Douglas–Peucker algorithm for fit polygons, then image moments to obtain the angle-distance waveform of particulate pollutants, the shape of marine-hydraulic-oil particulate pollutants was successfully identified. The designed method has the advantages of fast calculation efficiency, high accuracy, and real-time detection of various parameters of particulate pollutants in marine hydraulic oil. It has great significance for the fault diagnosis of hydraulic systems and prolonging the working life of hydraulic equipment. This research provides a new idea for the condition monitoring and fault diagnosis of ships and offshore engineering equipment.
Journal Article
Investigating Load Calculation for Broken Ice and Cylindrical Structures Using the Discrete Element Method
Ice loads are critical forces that impact the structural integrity of offshore equipment in high-latitude sea areas and play a pivotal role in the design of structures in ice-prone regions. The primary objective of this study is to investigate both experimental and numerical approaches to analyze ice loads on marine structures, elucidate their characteristics and patterns, and offer technical support for the design of structures in ice-prone areas. To achieve this goal, an ice model was built using polypropylene material, and experiments were conducted in a wave flume at room temperature to measure the ice resistance on cylindrical structures. Structural loads were assessed at various ice velocities while maintaining a fixed ice concentration. Furthermore, a high-performance discrete element technology was employed to develop a numerical simulation method for calculating ice resistance on cylindrical structures. Sensitivity analysis was conducted to evaluate the influence of discrete element density on the resistance outcomes. The predicted structural resistance for ice velocities corresponding to the experimental conditions was compared with the results obtained from the model experiment. The research findings indicate that the primary cause of ice resistance is the interaction between the structure and fragmented ice, which leads to collisions, friction, rotation, and local ice accumulation. To quantify the resistance, ice resistance coefficients were defined using an average resistance formula, representing different statistical values. These coefficients were found to remain relatively constant at varying sailing speeds. The results obtained through the discrete element method for ice resistance demonstrated a remarkable agreement with the experimental findings, both in terms of observed phenomena and numerical values. This agreement serves as evidence substantiating the effectiveness of the numerical approach. These methods offer efficient and accurate load prediction solutions for the design of structures in cold regions.
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